DEPT OF MECHANICAL ENGG
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Researcher
: Au-yeung KL |
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List of Research Outputs |
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Chan B.P., Li C.H., Au-yeung K.L., Sze K.Y. and Ngan A.H.W., A microplate compression method for elastic modulus measurement of soft and viscoelastic collagen microspheres, Annals of Biomedical Engineering. Biomedical Engineering Society, 2008, 36(7): 1254-1267. |
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Project Title: |
Petrol engine fuel quality requirements |
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Investigator(s): |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
University Research Committee / Committee on Research and Conference Grants - General Award |
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Start Date: |
07/1992 |
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Abstract: |
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To investigate the effect of the quality
of present-day fuels, available in |
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Researcher
: Chan ATY |
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Project Title: |
Strategic guidelines for future development to achieve sustainable air quality in urban areas |
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Investigator(s): |
Chan ATY |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Other Funding Scheme |
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Start Date: |
09/1999 |
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Abstract: |
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To develop a list of comprehensive
strategic planning and development guidelines for urban area development in
order to achieve sustainable air quality in |
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Project Title: |
Evaluation of air pollution indication system in Hong Kong |
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Investigator(s): |
Chan ATY |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Pollution Studies in |
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Start Date: |
01/2000 |
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Abstract: |
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To produce an objective assessment of its air quality and an effective mean of control measures through the analysis air quality and air pollution indices of various countries. |
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Project Title: |
Indoor/outdoor air quality relationships of respirable suspended particulates, nitrogen oxides and carbon monoxides in urban buildings |
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Investigator(s): |
Chan ATY, Li Y |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
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Start Date: |
09/2003 |
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Abstract: |
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To investigate experimentally and computationally indoor-outdoor (IO) relationships in buildings and to develop semi-empirical models for various situations. |
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Project Title: |
Correlation between urban morphological attributes and air pollution in urban areas in Hong Kong |
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Investigator(s): |
Chan ATY |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
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Start Date: |
09/2004 |
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Abstract: |
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To identify the urban morphological attributes that are responsible for air pollution in urban areas through analytical and experimental investigation. |
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Researcher
: Chan BP |
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Project Title: |
Photochemical crosslinking (PC) technology in fabrication of collagen-based scaffolds for tissue engineering |
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Investigator(s): |
Chan BP |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Seed Funding Programme for Basic Research |
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Start Date: |
02/2004 |
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Abstract: |
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To develop an innovative photochemical crosslinking technology, which is the light activation of a photosensitizing compound leading to the crosslinking of collagen. |
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Project Title: |
A novel photochemically crosslinked collagen scaffold for intervertebral disc replacement |
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Investigator(s): |
Chan BP, Cheung KMC, Lu WW, Wang M, Chan D, Luk KDK, So KF |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
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Start Date: |
10/2005 |
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Abstract: |
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To develops a better solution for biological disc replacement by considering both the mechanical requirement and the biocompatibility of the scaffolds simultaneously; to fabricate and engineer a novel collagen scaffold with desired properties for disc replacement using a new crosslinking technology; to evaluate the in vitro biocompatibility of the scaffold in supporting growth and ECM production of bone marrow derived mesenchymal stem cells (MSCs). |
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Project Title: |
Stem cell encapsulation in collagen microspheres – A platform technology for 3D cultures and cell delivery |
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Investigator(s): |
Chan BP, Chan GCF |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Seed Funding Programme for Basic Research |
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Start Date: |
01/2006 |
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Abstract: |
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The ultimate goal of the whole project is to develop collagen based cell encapsulation system for 3D culture expansion and cell delivery. The investigators would like to apply for the seed funding for a pilot study with the following specific objectives: 1. Build a prototype fabrication setup for cell encapsulation in collagen microspheres; 2. Investigate the influence of parameters (e.g. nozzle size) on the physical properties (e.g. size) of the microspheres. 3. Investigate the influence of the encapsulation process parameters (e.g. timing of harvest) and the matrix parameters (e.g. collagen density) on the cellular fate processes in particular viability, proliferation and differentiation potential of hMSCs. |
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Project Title: |
Mechanoregulation studies of mesenchymal stem cells in 3D configuration |
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Investigator(s): |
Chan BP, Chan D, Ngan AHW, Sze KY, Cheung KMC, Chan GCF |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Seed Funding Programme for Basic Research |
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Start Date: |
01/2007 |
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Abstract: |
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(1) investigate the effects of cyclic compression on cellular activities of MSCs including chondrogenic differentiation using collagen-MSC microspheres as the physiologically relevant model (2) study the role of focal contact expression as the adhesion-dependent mechanosensing mechanism in the mechanical stimulation-induced cellular changes |
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Project Title: |
Collagen biomaterial and bone marrow derived mesenchymal stem cell (MSCs) based therapy - Second generation tissue engineering solutions for cartilage repair |
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Investigator(s): |
Chan BP, Chan GCF, Chan D, Cheung KMC, Sze KY |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Guangdong-Hong Kong Technology Cooperation Funding Scheme |
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Start Date: |
06/2007 |
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Abstract: |
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This project aims to develop second generation tissue engineering solutions for cartilage repair using MSC-collagen microshpheres and photochemically crosslinked collagen membranes. Specifically, we aim to (1) optimize the conditions for construction of an automatic and high throughput facility for fabrication of collagen-cell microspheres; (2) optimize the conditions for fabrication of stable and injectable collagen-MSC microspheres using the microencapsulation technology; (3) optimize the conditions for fabrication of collagen-based artificial bone sheath graft using photochemical crosslinking technology; and (4) conduct the in vivo evaluation of the repair in a rabbit model. |
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List of Research Outputs |
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Chan B.P., Li C.H., Au-yeung K.L., Sze K.Y. and Ngan A.H.W., A microplate compression method for elastic modulus measurement of soft and viscoelastic collagen microspheres, Annals of Biomedical Engineering. Biomedical Engineering Society, 2008, 36(7): 1254-1267. |
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Chan
B.P., Cell and biomaterial-based technologies
for regenerative medicine, BioX@Science Park, |
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Chan B.P., Chan C.M. and So K.F., Collagen-based microspheres incorporating bioactive molecules, methods for preparation and modification, and applications., Provisional Patent Application (filed on 7 July 2007). 2007. |
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Chan
B.P., Hui
T.Y., Chan G.C.F., Chan D. and Cheung K.M.C., Collagen-mesenchymal stem
cell microspheres for regenerative medicine., World Forum for Spine
Research, Kyoto, Japan (Best oral pesentation award), Jan 23-26. |
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Chan B.P., Hui T.Y., Chan G.C.F., Chan D. and Cheung K.M.C., Collagen-mesenchymal stem cell microspheres for regenerative medicine, Best Oral Presentation Award, World Forum for Spine Research - the intervertebral disc, first Japanese meeting, Kyoto, Japan, January 23-26, 2008. 2008. |
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Chan B.P., Chan C.M. and So K.F., Effects of photochemical crosslinking on the microstructure of collagen and a feasibility study on controlled protein release, Acta Biomaterialia. Elsevier Ltd., 2008, 4: 1627-1636. |
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Chan
B.P., Hui
T.Y., Yeung C.W. and Chan G.C.F., Self-Assembled
Collagen-Human Mesenchymal Stem Cell (hMSCs) Microspheres – Novel Bio-devices
for Cell Delivery, The 34th Annual Meeting and Exposition of the
Controlled Release Society, 7-11 Jul 2007. |
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Chan B.P., Hui T.Y., Yeung C.W., Li J., Mo F.Y. and Chan G.C.F., Self-assembled collagen–human mesenchymal stem cell microspheres for regenerative medicine, Biomaterials. 2007, 28: 4652-4666. |
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Chan C.M., So K.F. and Chan B.P., Fabrication of nano-fibrous collagen microspheres for protein delivery and effects of photochemical crosslinking on release kinetics, Journal of Controlled Release. Elsevier B.V., 2008, 129: 135-143. |
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Chan
C.M., So K.F. and Chan B.P., Photochemically
crosslinked collagen microspheres for controlled protein release, The 34th
Annual Meeting and Exposition of the Controlled Release Society. 7-11 Jul
2007. |
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Cheng
H.W., Tsui K., Cheung K.M.C., Chan D. and Chan B.P., Decellularization of
chondrocyte-encapsulated collagen microspheres, World Forum for Spine
Research the Intervertebral Disc. |
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Hui T.Y., Cheung K.M.C., Cheung W.L., Chan D. and Chan B.P., In vitro chondrogenic differentiation of human mesenchymal stem cells in collagen microspheres: influence of cell seeding density and collagen concentration, Biomaterials. Elsevier Ltd., 2008, 29: 3201-3212. |
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Li
C.H., Ngan A.H.W., Sze K.Y. and Chan B.P., Microplate manipulation
of human mesenchymal stem cells (hMSCs) - collagen microspheres, World
Forum for Spine Research the Intervertebral Disc. |
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Wong H.L., Wang M., Cheung P.T., Yao K.M. and Chan B.P., A 3D collagen microsphere culture system for GDNF-secreting HEK293 cells with enhanced protein productivity, Biomaterials. Elsevier Ltd., 2007, 28: 5369-5380. |
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Researcher
: Chan CM |
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List of Research Outputs |
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Chan B.P., Chan C.M. and So K.F., Collagen-based microspheres incorporating bioactive molecules, methods for preparation and modification, and applications., Provisional Patent Application (filed on 7 July 2007). 2007. |
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Chan B.P., Chan C.M. and So K.F., Effects of photochemical crosslinking on the microstructure of collagen and a feasibility study on controlled protein release, Acta Biomaterialia. Elsevier Ltd., 2008, 4: 1627-1636. |
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Chan C.M., Controlled protein release from collagen matrix, M.Phil.
Thesis. Hong Kong, The |
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Chan C.M., So K.F. and Chan B.P., Fabrication of nano-fibrous collagen microspheres for protein delivery and effects of photochemical crosslinking on release kinetics, Journal of Controlled Release. Elsevier B.V., 2008, 129: 135-143. |
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Chan C.M., So K.F. and Chan B.P., Photochemically crosslinked
collagen microspheres for controlled protein release, The 34th Annual
Meeting and Exposition of the Controlled Release Society. 7-11 Jul 2007. |
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Researcher
: Chan CW |
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Project Title: |
A unified framework for the compensation of memoryless actuator nonlinearity in feedback control |
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Investigator(s): |
Chan CW |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Small Project Funding |
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Start Date: |
11/2003 |
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Abstract: |
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To develop a general compensator for unknown memoryless actuator non-linearity, but known upper or lower bounds, and to derive conditions for the compensated system to be globally stable, by extending the actuator saturation compensator; to devise methods to design the saturation compensator from the stability conditions in both the time and frequency domain; to develop special guidelines for designing the actuator compensator for this class of controllers, and to investigate stability of the compensated system. |
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Project Title: |
A time series approach to detect the transcriptional start sites of genes |
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Investigator(s): |
Chan CW |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Small Project Funding |
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Start Date: |
01/2006 |
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Abstract: |
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After sequencing, the next important task is to extract the hidden meaning behind the genetic information based on the four-letter alphabet {A, C, T, G}, by first finding the genes, then determining how their expression is regulated and the functions of the proteins they encode. These results would be essential to analyze the association between gene mutations and diseases, and to discover measures to cure the diseases. Two common approaches to identify genes are: to compare with known genes using e.g., data mining methods, and to identify special features in the DNA sequence that signify the possible existence of genes. The difficulties in the first approach are to choose suitable gene sequences for comparison and to select the thresholds in the comparison. Further, it is also difficult to identify new genes, as comparisons are made only with known genes. The second approach is more general, as it is based on the detection of the Transcriptional Start Site (TSS), e.g., the CpG island, which does not rely on the knowledge of existing genes. Although several techniques are available, they are developed based on the basic genetic information data. As sudden changes in the counts of CpGs that characterize the CpG islands are similar to faults in engineering systems, the detection of TSSs can be formulated as a fault detection problem, and well developed fault detection techniques for engineering systems can be applied to detect genes in the DNA sequence. The proposed techniques involve transforming first the genetic data into a time series before applying statistical techniques to detect the surges in the counts of CpG. The objectives of the project are:(1) To devolop statistical techniques based on the asymptotic local approach for detecting the surges in the counts of CpGs for detecting the TSS of CpG rich genes,(2) To apply the methods developed in this project to identify genes in human chromosomes, and to compare its performance with other existing techniques. |
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Project Title: |
Installation of wave suppressor in the Victoria Harbour |
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Investigator(s): |
Chan CW |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Utility Information Ltd. |
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Start Date: |
06/2006 |
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Abstract: |
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To study the installation of wave
suppressor in the |
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Researcher
: Chan KW |
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Project Title: |
Computer-aided mould design and manufacture of thermoformed PVC sheets |
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Investigator(s): |
Chan KW |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Other Funding Scheme |
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Start Date: |
01/2002 |
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Abstract: |
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To develop a computer-aided design and manufacturing process for producing thermoformed PVC sheets for packaging purpose. |
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Project Title: |
Design and development of implantable artifical finger joints for biological repair |
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Investigator(s): |
Chan KW, Chow SP, Lu WW, Chiu PKY, Ngan AHW, Luk KDK |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Guangdong-Hong Kong Technology Cooperation Funding Scheme |
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Start Date: |
04/2007 |
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Abstract: |
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(1) Create an Asian finger bone DATABASE for determining the manufacturing sizes of artificial finger joint for Asian patients and development of a 3D CAD SYSTEM for finger joint design. (2) Enhance ONE-PIECE artificial finger joint DESIGN and TWO-PIECE artificial finger joint DESIGN. (3) Identify appropriate manufacturing PROCESSES and MATERIALS for manufacturing artificial finger joints. (4) Produce functional PROTOTYPES for conducting mechanical tests and tests on animal models. (5) Conduct phase 1 CLINICAL TRIALS on human subject for assessment. (6) REFINE finger joint design based on test results and manufacturing considerations. (7) Solicit and facilitate potential investors to COMMERCIALIZE the developed artificial finger joints. |
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Researcher
: Chen K |
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Project Title: |
Virtual component modelling for components made of a multiphase perfect material |
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Investigator(s): |
Chen KZ |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Seed Funding Programme for Basic Research |
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Start Date: |
02/2005 |
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Abstract: |
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The main objectives of the project are: 1) To verify the fesibility of the manufacturing principle for the CMMPM, a model of the virtually manufactured CMMPM has to be established first and is used to check whether the precisions of the virtually manufactured CMMPM meet all the requirements specified in its CAD model. 2) To faithfully evaluate the manufacturability of CMMPMs and the feasibility of the proposed manufacturing principle, and to discover any manufacturing defects introduced by the manufacturing principle and process, the used tools and facilities, and the related technologic parameters. |
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Researcher
: Chen KZ |
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Project Title: |
Virtual component modelling for components made of a multiphase perfect material |
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Investigator(s): |
Chen KZ |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Seed Funding Programme for Basic Research |
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Start Date: |
02/2005 |
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Abstract: |
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The main objectives of the project are: 1) To verify the fesibility of the manufacturing principle for the CMMPM, a model of the virtually manufactured CMMPM has to be established first and is used to check whether the precisions of the virtually manufactured CMMPM meet all the requirements specified in its CAD model. 2) To faithfully evaluate the manufacturability of CMMPMs and the feasibility of the proposed manufacturing principle, and to discover any manufacturing defects introduced by the manufacturing principle and process, the used tools and facilities, and the related technologic parameters. |
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List of Research Outputs |
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Wang F., Chen K.Z. and Feng X.A., A simulation model for the fabrication of components made from multiphase perfect materials, Robotics and Computer-Integrated Manufacturing. Exeter, UK, Elsevier Ltd., 2008, 24: 514-523. |
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Wang F., Chen K.Z. and Feng X.A., Modeling of plasma spraying process to manufacture hybrid materials, Computer-aided Design. Exeter, UK, Elsevier Ltd., 2007, 39: 1120-1133. |
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Wang
F., Chen K.Z. and Feng
X.A., Virtual manufacturing to design a manufacturing technology for
components made of a multiphase perfect material, International CAD
Conference and Exhibition (CAD'08). |
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Zhang X.J., Chen K.Z. and Feng X.A., An effective evaluation method of mateiral affinity between adjacent material regions of a component for component design, Materials & Design. UK, Elsevier Ltd, 2008, 29: 146-153. |
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Zhang X.J., Chen K.Z. and Feng X.A., Material database for the material design of components made of a multiphase perface material, Materials & Design. Exeter, UK, Elsevier Ltd, 2008, 29: 1131-1144. |
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Zhang X.J., Chen K.Z. and Feng X.A., Material selection using an improved Genetic Algorithm for material design of components made of a multiphase material, Materials & Design. Exeter, UK, Elsevier Ltd., 2008, 29: 972-981. |
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Researcher
: Chen X |
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List of Research Outputs |
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Chen X. and Soh A.K., Impact of combined electric response on left-handed materials, EPL. Physics, 2007, 80(3): 37006. |
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Researcher
: Chen YH |
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Project Title: |
Haptic modelling and filtering in reverse engineering model refinement |
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Investigator(s): |
Chen YH |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Seed Funding Programme for Basic Research |
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Start Date: |
01/2005 |
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Abstract: |
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1) To develop a haptic interface and surface filtering algorithm for haptically guided mark-up of feature edges for surface smoothing, and perform local, haptic-based smoothing of noise regions. 2) To develop a hatpic based algorithm to allow a user to easily add extra data with reference to the existing model or based on the user's new concepts. |
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Project Title: |
Interactive Haptic Shape Modeling of Heterogeneous Objects |
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Investigator(s): |
Chen YH |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
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Start Date: |
11/2005 |
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Abstract: |
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The objectives of this project are: 1. To develop Physical Models for haptic interaction; 2. To develop representation schemes for heterogeneous property representation; 3. To study the haptic stability; 4. Collision detection and response algorithm studies; 5. Model simplification algorithm studies. |
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Project Title: |
haptic interacting and editing of multi-material product in computer aided design |
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Investigator(s): |
Chen YH |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Seed Funding Programme for Basic Research |
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Start Date: |
07/2006 |
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Abstract: |
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The major purpose of the proposed investigation is to develop a multi-material physical model and related rendering algorithms that are suitable for real-time haptic interaction between a multi-material object and an external tool. This investigation is mainly driven by recent research in computer aided modeling and representation of multi-material objects in engineering design and enormous interest in surgical simulation. The proposed project is made feasible with the latest technological development in haptic technologies, and the increasing computational power of today’s desktop computers. In graphical visualization, the rendering rate is only about 30 to 60 Hz. In haptic interaction, both graphical rendering and force rendering must be considered at the same time. Realistic force rendering presents a big challenge as the required force rendering rate is about 1kHz. Therefore, there are far more difficult problems to be considered and solved than only considering graphic modeling as in existing computer aided systems. Among many of the key issues to be considered in the haptic interaction are: * Force models used for the haptic interaction; * Haptic stability; * Collision detection and response techniques; * Intermediate representation (buffering) to ensure loop (both haptic and simulation loops) synchronization. The above issues must be considered for haptic interaction of object with isotropic mechanical properties. For haptic interaction of multi-material objects that have anisotropic mechanical properties, even more issues such as efficient force vector modeling must be considered. Multi-material objects, composed of different materials, are increasingly being used in engineering applications, current Computer-Aided Design (CAD) systems are excellent tools for the modeling of part geometry, but are unable to model and edit local material information of a part. It is also difficult for a part to be decomposed into a number of parts with free-form surfaces. The proposed investigation is critical for the successful development of CAD systems for multi-material objects as it allows the perception of different material properties in a part. |
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Project Title: |
Realistic Modeling and Rendering of Dynamic Torques and Forces in Bone Drilling |
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Investigator(s): |
Chen YH |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Seed Funding Programme for Basic Research |
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Start Date: |
09/2007 |
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Abstract: |
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Manual bone drilling/milling, used in many important surgical operations such as the insertion of pins or screws during the repair of fractures or installation of prosthetic devices requires high skills to prevent tissue damages and superfluous heat generation resulting in thermal necrosis. In such clinical operations, there is no room for mistakes. The ultimate goal of computer aided surgery is therefore to help the surgeon to plan and rehearse a clinical operation as if he/she is working on a real patient. Given the latest development in MRI scanning, computing hardware and software, robotics, haptic technology, and most of all, devoted researchers in these areas, the ultimate goal is achievable in the foreseeable future. In this project, research in computer aided surgery will be focused on bone drilling and milling which are important steps in clinical operations such as craniofacial surgery, head cancer tumor removal, and the insertion of pins/screws during the repair of fractures or installation of prosthetic devices, etc. The success of the proposed research will be dependent on the accurate measurements in experimental bone drilling and milling. The measurement data also provides important information for surgical robot control which is also a hot research area in recent years. The following are the key issues identified for the proposed project.1.Accurate measurement of thrust forces in bone drilling and milling: All experiments in this project will be conducted on pig bones. Due to the diversity of drilling tool geometry, together with large variations of drilling process parameters, a large number of experiments must be done. 2. Measurement of torques in roll, yaw and pitch: while in drilling, the major toque is in the roll direction while other torques are only present when the drilling tool is tilted. However, for accurate modeling, torques in pitch and yaw muct be measured too. 3. Real-time haptic force and torque rendering algorithms: recently there are some research publications about bone drilling simulation. However, none of the publications has mentioned the force and torque variation as a parameter of drilling/milling parameter settings such as thrust force, rotational speed, feed rate, and tool geometry, mainly because they did not have experimental data. Realistic torque rendering in 3D space is a challenging task itself as torques in roll, pitch and yaw must be considered simultaneously. In this research, torque rendering will be investigated based on quaternion calculus.4. Parametric representation of heterogeneous properties of bone structure: A bone is composed of heterogeneous materials. Current computer aided design systems only support the modeling of object made of homogeneous material. Even though a lot of research has been done in heterogeneous material modeling recently, there is no method that can effectively represent complicated object shape such as bone with none-uniform property changes and porous material structures. In this research, the representation of heterogeneous bone properties will be simplified as a parametric model. The parametric model will be developed based on experimental data from actual bone drilling and milling. 5. Efficient Multi-modal integration: Visual, audio and haptic renderings dictate different refresh rates. For visual rendering, only 30Hz will be sufficient in most cases while in audio rendering, up to as high as 10kHz is needed for 3D sound effect. The most challenging of all is the rendering of forces and torques that require a refresh rate of around 1kHz. The high refresh rate of torque and force presents a problem for computing power of today's computers. For example, collision detection, force and torque computation that work on a lot of data must be computed in a very short time of 1ms. The problem will be investigated by looking into both multi-resolution geometry representation and multi-rate haptic rendering. |
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Researcher
: Cheng HW |
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List of Research Outputs |
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Cheng H.W., Tsui K., Cheung K.M.C., Chan D. and Chan B.P., Decellularization of
chondrocyte-encapsulated collagen microspheres, World Forum for Spine
Research the Intervertebral Disc. |
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Researcher
: Cheung KC |
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Project Title: |
A study on the use of fuel cells as replacement for lead-acid batteries in solar-based electrical power generation |
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Investigator(s): |
Cheung KC |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Low Budget High Impact Programme |
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Start Date: |
11/2001 |
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Abstract: |
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To address the following issues: (1) the performance of small sized (in the order of kilowatts) fuel cells under varying d.c. and a.c. loads; (2) the feasibility of using water electrolysis as a means to store surplus solar-generated electrical power, especially under the climatic condition of hong Kong in which days of overcast follow days of sunny spells. |
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Project Title: |
A study on solar-powered water electrolysis for hydrogen production |
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Investigator(s): |
Cheung KC |
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Department: |
Mechanical Engg |
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Source(s) of Funding: |
Small Project Funding |
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Start Date: |
11/2002 |
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Abstract: |
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To study the use of solar panels to generate electrical power for water electrolysis. |
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Researcher
: Cheung WL |
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List of Research Outputs |
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Duan
B., Zhou W., Cheung W.L. and Wang M., Synthesis of Ca-P nanoparticles
and fabrication of Ca-P/PHBV microspheres for bone tissue engineering, Proceedings
of the 1st International Symposium on Surface and Interface of Biomaterials.
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Duan
B., Zhou W., Cheung W.L. and Wang M., Totally bioresorbable
nanocomposite microspheres and scaffolds for bone tissue engineering, Proceedings
of the 11th Annual Conference on Ceramics, Cells and Tissues. |
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Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser Sintering: Part I. synthesis of Ca-P and manufacture of
Ca-P/PHBV nanocomposite microspheres, Proceedings of the 8th World
Biomaterials Congress. |
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Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser Sintering: Part II. scaffold fabrication and
characterization, Proceedings of the 8th World Biomaterials Congress. |
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Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser sintering: Part III. process optimization, Proceedings
of the 8th World Biomaterials Congress. |
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Hui T.Y., Cheung K.M.C., Cheung W.L., Chan D. and Chan B.P., In vitro chondrogenic differentiation of human mesenchymal stem cells in collagen microspheres: influence of cell seeding density and collagen concentration, Biomaterials. Elsevier Ltd., 2008, 29: 3201-3212. |
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Zhou
W., Duan B., Wang M. and Cheung W.L., Crystallization
kinetics of Poly(L-Lactide)/Carbonated hydroxyapatite nanocomposite under
isothermal and non-isothermal conditions, Proceedings of the 8th World
Biomaterials Congress. |
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Zhou W., Lee S.H., Wang M., Cheung W.L. and Ip W.Y., Selective Laser Sintering Of Porous Tissue Engineering Scaffolds From Poly(l-lactide)/carbonated Hydroxyapatite Nanocomposite Microspheres, Journal Material Sci: Mater Med. 2007, 19: 2535-2540. |
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Zhou
W., Wang M., Cheung W.L., Yuen C.K. and Ip W.Y., Selective laser sintered
Meso-porous PLLA and PLLA/CHAp nanocomposite scaffolds for bone tissue
engineering, Proceedings of the 8th World Biomaterials Congress. |
|
Zhou
W., Wang M., Cheung W.L., Gao B.C. and Jia D.M.,
Synthesis of carbonated hydroxyapatite nanospheres through nanoemulsion, Journal
of Materials Science: Materials in Medicine. |
|
Zhou
W., Wang M. and Cheung W.L., Thermal stability and
in vitro solubility of carbonated hydroxyapatite nanospheres, Proceedings
of the 8th World Biomaterials Congress. |
|
Researcher
: Ching WH |
|
List of Research Outputs |
|
Li Y.,
Ching W.H., Qian H., Yuen P.L., Seto W.H., Kwan J.K., Leung J.K.C., Leung M.K.H. and Yu S.C.T., An
evaluation of the ventilation performance of new SARS isolation wards in nine
hospitals in |
|
Researcher
: Chiu HS |
|
List of Research Outputs |
|
Chiu
H.S. and Chow
K.W., Exact solutions for a class of variable coefficient nonlinear
Schrödinger equations, International Conference on Nonlinear Waves: Theory
and Applications, |
|
Researcher
: Chow HN |
|
List of Research Outputs |
|
Chow H.N., Computer aided modelling of porous structures, Ph.D. Thesis.
Hong Kong, The |
|
Researcher
: Chow KW |
|
Project Title: |
Periodic patterns in coupled hydrodynamical and optical waveguides |
|
Investigator(s): |
Chow KW |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2005 |
|
Abstract: |
|
To examine if wave propagation will persist for coupled waveguides of increasing complexity. Existence of solitary periodic, or generally these 'clusters' of solitary waves will promote our ability to characterize the physical problem under investigation, and will reveal the significant underlying structure of the model employed. |
|
Project Title: |
Nonlinear localized modes and their dynamics: applications in hydrodynamics and optics |
|
Investigator(s): |
Chow KW, Rogers C |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2006 |
|
Abstract: |
|
The main objective of this project is to examine the evolution of similar modes in hydrodynamic and optical systems. Interactions among waves of different scales will be investigated. |
|
List of Research Outputs |
|
Chiu
H.S. and Chow K.W., Exact
solutions for a class of variable coefficient nonlinear Schrödinger
equations, International Conference on Nonlinear Waves: Theory and
Applications, |
|
Chow K.W. and Nakkeeran K., Bright - dark and double - humped pulses in averaged, dispersion managed optical fiber systems, Optical Fibers Research Advances. Nova, 2007, Chapter 11: 301 - 313. |
|
Chow K.W., Lam C.K. and Wong K.K.Y., Modulation Instabilities in a System of Four Coupled, Nonlinear Schrodinger Equations, Physics Letters A. 2008, vol. 372, no. 55: pp. 4596-4600. |
|
Chow K.W., Yip L.P. and Grimshaw R.H.J., Novel solitary pulses for a variable coefficient derivative nonlinear Schrödinger equation, Journal of the Physical Society of Japan. 2007, 76: 074004(6 pages). |
|
Chow K.W., Merhasin I.M., Malomed B.A., Nakkeeran K., Senthilnathan K. and Wai P.K.A., Periodic waves in fiber Bragg gratings, Physical Review E. 2008, 77: 026602 (8 pages). |
|
Chow K.W., Lam C.K., Nakkeeran K. and Malomed B.A., Transmission and stability of solitary pulses in complex Ginzburg – Landau equations with variable coefficients, Journal of the Physical Society of Japan. 2008, 77: 054001 (5 pages). |
|
Chow K.W. and Malomed B.A., Transmission of solitary pulses in nonlinear inhomogeneous media, SPIE (International Society of Optical Engineering/Society of Photonics and Instrumentation Engineers) Proceedings. 2007, 6785: 67850X (6 pages). |
|
Chow K.W., Wave Motion. El Sevier, 2007. |
|
Fung S.K., Lam S.K., Cheng S.W.K. and Chow K.W., On stent graft models in thoracic aortic endovascular repair: A computational investigation of the hemodynamic factors, Computers in Biology and Medicine. 2008, 38: 484 - 489. |
|
Grimshaw R.H.J., Zhang D. and Chow K.W., Generation of solitary waves by transcritical flow over a step, Journal of Fluid Mechanics. 2007, 587: 235 - 254. |
|
Lam
C.K. and Chow K.W.,
Solitary pulses in nonlinear Schrödinger (NLS) systems and derivative NLS
models, Dynamics Days Europe 2007, |
|
Lam S.K., Fung S.K., Cheng S.W.K. and Chow K.W., A Computational Investigation on the Effect of Biomechanical Factors Related to Stent-graft Models in the Thoracic Aorta, International Conference of the IEEE Engineering in Medicine and Biology Society, in conjunction with the Biennial Conference of the French Society of Biological and Medical Engineering, Lyon, France. 2007. |
|
Merhasin I.M., Malomed B.A., Senthilnathan K., Nakkeeran K., Wai P.K.A. and Chow K.W., Solitons in Bragg gratings with saturable nonlinearities, Journal of the Optical Society of America B. 2007, 24: 1458-1468. |
|
Rogers C.W., Chow K.W. and Conte R.M.J., On a capillarity model and the Davey – Stewartson I system: Quasi-doubly periodic wave patterns, Nuovo Cimento B. 2007, 122: 105 - 111. |
|
Rogers C.W., Schief W.K. and Chow K.W., On a novel class of model constitutive laws in nonlinear elasticity (Proceedings in Nonlinear Physics, Theory and Experiments), Theoretical Physics (Special Issue). 2007, 152: 1030 - 1042. |
|
Shek C.M. and Chow K.W., The discrete modified Korteweg – de Vries equation with non–vanishing boundary conditions: Interactions of solitons, Chaos, Solitons and Fractals. 2008, 36: 296 - 302. |
|
Zhang
D. and Chow K.W.,
Propagation of long waves over a step, Hong Kong – |
|
Researcher
: Chwang ATY |
|
Project Title: |
Wrist pulse contour screening programme |
|
Investigator(s): |
Chwang ATY, Lau CP |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
02/2004 |
|
Abstract: |
|
To set up a WPC Screening Centre to provide the WPC evaluation service to local adult subjects at the age of 18 years or above. |
|
Project Title: |
Fundamental Study of Nanofluids in Nanochannels of Various Shapes |
|
Investigator(s): |
Chen G |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2006 |
|
Abstract: |
|
The main objective of this email is to develop analytical models of nanofluid dynamics. Implications for designing nanofluidic circuits will be summarized for applications. |
|
Researcher
: Conte RMJ |
|
List of Research Outputs |
|
Rogers C.W., Chow K.W. and Conte R.M.J., On a capillarity model and the Davey – Stewartson I system: Quasi-doubly periodic wave patterns, Nuovo Cimento B. 2007, 122: 105 - 111. |
|
Researcher
: Duan B |
|
List of Research Outputs |
|
Duan B.,
Wu L., Yuan X., Hu Z., Li X., Zhang Y., Yao K. and Wang M., Hybrid nanofibrous membranes of
PLGA/Chitosan fabricated via electrospinning array, Journal of Biomedical
Materials Research Part A. USA, Wiley Periodicals, Inc., 2007, |
|
Duan B.,
Zhou W., Cheung W.L. and Wang M., Synthesis of Ca-P nanoparticles
and fabrication of Ca-P/PHBV microspheres for bone tissue engineering, Proceedings
of the 1st International Symposium on Surface and Interface of Biomaterials.
|
|
Duan B.,
Zhou W., Cheung W.L. and Wang M., Totally bioresorbable
nanocomposite microspheres and scaffolds for bone tissue engineering, Proceedings
of the 11th Annual Conference on Ceramics, Cells and Tissues. |
|
Duan B.,
Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser Sintering: Part I. synthesis of Ca-P and manufacture of
Ca-P/PHBV nanocomposite microspheres, Proceedings of the 8th World
Biomaterials Congress. |
|
Duan B.,
Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser Sintering: Part II. scaffold fabrication and
characterization, Proceedings of the 8th World Biomaterials Congress. |
|
Duan B.,
Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser sintering: Part III. process optimization, Proceedings
of the 8th World Biomaterials Congress. |
|
Zhou
W., Duan B., Wang M. and Cheung W.L., Crystallization kinetics of
Poly(L-Lactide)/Carbonated hydroxyapatite nanocomposite under isothermal and
non-isothermal conditions, Proceedings of the 8th World Biomaterials
Congress. |
|
Researcher
: Duggan BJ |
|
List of Research Outputs |
|
Shen G.J. and Duggan B.J., Texture development in a
cold-rolled adn annealed body-centered-cubic Mg-Li alloy, Metallurgical
and Materials Transactions A. USA, ASM, 2007, |
|
Researcher
: Fan J |
|
List of Research Outputs |
|
Fan J., Wang L. and Cheng L., Electrokinetic effects on flow and heat transfer in parallel-plate microchannels, International Journal of Nonlinear Sciences and Numerical Simulation. 2007, 8: 335-345. |
|
Fan J., Wang L. and Cheng L., Forced convection in rectangular microchannels: electrokinetic effects, International Journal of Nonlinear Sciences and Numerical Simulation. 2007, 8: 359-374. |
|
Researcher
: Feng J |
|
List of Research Outputs |
|
Feng J., Lam J., Xu S. and Shu Z., Optimal stabilizing controllers for linear discrete-time stochastic systems, Optimal Control Applications and Methods. 2008, 29(3): 243-253. |
|
Feng J., Lam J., Xu S. and Shu Z., Stabilization of stochastic systems with optimal decay rate, IET Journal of Control and Applications. 2008, 2(1): 1-6. |
|
Researcher
: Gibson I |
|
List of Research Outputs |
|
Ip W.Y., Chow S.P., Lam K.W., Gibson I., Ngan A.H.W., Lu W. and Chiu P.K.Y., A Novel Artificial Prosthetic Replacement For The Proximal Interphalangeal Joint Of The Hand - From Concept To Prototype, Australian Orthopaedic Association Continuing Orthopaedic Education Meeting . 2008. |
|
Researcher
: Grimshaw RHJ |
|
List of Research Outputs |
|
Chow K.W., Yip L.P. and Grimshaw R.H.J., Novel solitary pulses for a variable coefficient derivative nonlinear Schrödinger equation, Journal of the Physical Society of Japan. 2007, 76: 074004(6 pages). |
|
Grimshaw R.H.J., Zhang D. and Chow K.W., Generation of solitary waves by transcritical flow over a step, Journal of Fluid Mechanics. 2007, 587: 235 - 254. |
|
Researcher
: Hong L |
|
List of Research Outputs |
|
Hong L., Soh A.K., Du Q.G. and Li J.Y., Interaction of O vacancies and domain structures in single crystal BaTiO3: Two-dimensional ferroelectric model, Physical Review B. USA, Amer Physical Soc., 2008, 77(9): 094104. |
|
Researcher
: Hu R |
|
List of Research Outputs |
|
Hu R.
and Soh A.K., Mesoscopic simulation
of the properties of ferromagnetic materials, (Keynote paper), International
Conference on Computaitonal & Experimental Engineering and Science
(ICCES'08). |
|
Hu R.
and Soh A.K., Mesoscopic simulation
of the properties of ferromagnetic materials, Proceedings of the
International Conference on Computational & Experimental Engineering and
Science (ICCES'08). |
|
Hu R.,
Scale and stress effects on the behavior of ferromagnetic materials, Ph.D.
Thesis. Hong Kong, The |
|
Song Y., Hu R. and Soh A.K., Microscopic simulations of the behavior of ferroelectrics and ferromagnetics, Physica Scripta. UK, IOP Publishing Ltd., 2007, T129: 136-139. |
|
Researcher
: Huang J |
|
List of Research Outputs |
|
Huang J., Ma X. and Huang L., Experimental study and control of noise from a window-type ventilation fan, The 3rd International Fan Noise Symposium (Fan Noise 2007, 17-19 September, Lyon, France). 2007, 9 pages (paper 43). |
|
Researcher
: Huang L |
|
Project Title: |
Braodband duct noise control at very low frequencies |
|
Investigator(s): |
Huang L |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
12/2003 |
|
Abstract: |
|
A lot of noise sources are low-frequency
in nature, such as the heavy road traffic, marine traffic, and the indoor air
conditioning system. More discussion on the general impact of noise on our
daily life in crowded cities like |
|
Project Title: |
The suppression of multiple tones for small axial-flow fans |
|
Investigator(s): |
Huang L |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
12/2005 |
|
Abstract: |
|
The underlying objective of the project
is to bridge the gap between the fan aerodynamics and aeroacoustics in the
following sense. Acoustic design normally follows aerodynamic design and is
treated as a modification exercise. This project seeks to integrate the two
and answer the question of whether an essentially toneless fan is possible
without sacrificing the aerodynamic performance. Here, a toneless fan is
defined as a fan whose discrete noises are at most a couple of decibels above
the level of broadband noise associated with a descent flow condition in
which the flow can be turbulent but is attached to profiled blades. Tonal
noise is radiated at the blade passing frequency (BPF) and many of its
harmonics with frequency f=mxBPF, m=1,2,3... For small axial flow fans with
few blades, tones of m>=4 are rarely above the broadband with a
significant margin, so the emphasis of the project is on the suppression of
multiple tones of small order m. A fresh perspective and the key issue: The
main source of tonal noise is the interaction between the rotor blades and
nearby stationary parts, such as the motor struts and/or inlet/exit
guidevanes. The blade tip speed of a small fan is typically below |
|
Project Title: |
Stability of flow over a broadband wave reflector |
|
Investigator(s): |
Huang L |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2007 |
|
Abstract: |
|
1. To understand the flow-acoustic-structural interaction for flow induced vibration of a tensioned membrance, especially the role of the acoustic boundary condition on the observed instability. 2. To provide guidelines on how the new device (US Patent 10/697, 493 and its development) should be applied with regard to flow. 3. Research plan step 1 (8 months): numerical simulation of the instability problem (coding and initial analysis). This step will develop codes to identify the eigenvalues of the coupled system. The method of Chebyshev collocation will be used in either frequency domain or time domain. Initial coding will focus on the model with the compressible, potential flow interacting with the membrance, while the shear flow effect will be explored if the results of this model does not seem to account for the qualitative observations in the experiment. 4. Research plan step 2 (8 months): parametric study of controlling parameters. The anticipated key parameters include the flow speed, membrane length, mass and tension, the existence and geometry of the cavity, and the acoustic impedance at the upstream and downstream boundaries. 5. Research plan step 3 (8 months): experiment-simulation comparison on key mechanisms. In addition to the existing qualitative experimental observations, measurements will be taken to map out the instability regions. The qualitative instability observations (divergence vs flutter, vibration frequency and mode) will be compared with results from the numercial simulation. The agreement should reveal the key mechanisms of the instability, thus pointing to the directions in which the new device can be correctly and successfully employed in future design. |
|
List of Research Outputs |
|
Choy Y.S., Huang J., Huang L. and Zhou Y., An experimental study of flow induced vibration on a tensioned membrane, Journal of Mechanical Science and Technology. 2007, 21: 1359-1366. |
|
Choy Y.S. and Huang L., Drum silencer optimized
for NC-weighted insertion loss, Invited talk at NOISE-CON 2007, October
22-24, |
|
Choy Y.S. and Huang L., Drum silencer optimized
for NC-weighted insertion loss, NOISE-CON 2007 (October 22-24, |
|
Huang J., Ma X. and Huang L., Experimental study and control of noise from a window-type ventilation fan, The 3rd International Fan Noise Symposium (Fan Noise 2007, 17-19 September, Lyon, France). 2007, 9 pages (paper 43). |
|
Huang L., Editorial Board Member, The Open Acoustics Journal. Bentham Science Publishers, 2008. |
|
Huang L., Introduction to Acoustics and Noise Control, Hong Kong Institute of Acoustics. 2008. |
|
Lu H.Z., Huang L., So R.M.C. and Wang J., A computational study of the interaction noise from a small axial-flow fan, Journal of the Acoustical Society of America. 2007, 122: 1404-1415. |
|
Wang C.Q. and Huang L., Analysis of absorption and reflection mechanisms in a three-dimensional plate silencer , Journal of Sound and Vibration. 2008, 313: 510-524. |
|
Wang C.Q., Cheng L. and Huang L., Experimental realization of a broadband low frequency plate silencer, 12th Asia-Pacific Vibration Conference (August 6-9, 2007, Hokkaido University, Sapporo, Japan). 2007, 6 pages (paper 34). |
|
Researcher
: Huang X |
|
List of Research Outputs |
|
Qian H., Li Y., Huang X., Sun H., Seto W.H. and Yuen P.L., Particle removal efficiency of a portable hepa air cleaner in a hospital ward, Presented in the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007), Sendai, October 28th - 30th, 2007.. 2007. |
|
Researcher
: Hui SCM |
|
List of Research Outputs |
|
Hui
S.C.M., Sustainable building technologies for
hot and humid climates, Joint Hong Kong and Hangzhou Seminar for
Sustainable Building, 21-23 September 2007, Hangzhou, China. |
|
Hui
S.C.M., The role of building energy codes in
climate change mitigation, Proceedings of the Zhejiang-Hong Kong Joint
Symposium 2007, 6-7 July 2007, |
|
Researcher
: Hui TY |
|
List of Research Outputs |
|
Chan
B.P., Hui T.Y., Chan G.C.F., Chan D. and Cheung K.M.C., Collagen-mesenchymal stem
cell microspheres for regenerative medicine., World Forum for Spine
Research, Kyoto, Japan (Best oral pesentation award), Jan 23-26. |
|
Chan B.P., Hui T.Y., Chan G.C.F., Chan D. and Cheung K.M.C., Collagen-mesenchymal stem cell microspheres for regenerative medicine, Best Oral Presentation Award, World Forum for Spine Research - the intervertebral disc, first Japanese meeting, Kyoto, Japan, January 23-26, 2008. 2008. |
|
Chan
B.P., Hui T.Y., Yeung C.W. and Chan G.C.F., Self-Assembled
Collagen-Human Mesenchymal Stem Cell (hMSCs) Microspheres – Novel Bio-devices
for Cell Delivery, The 34th Annual Meeting and Exposition of the
Controlled Release Society, 7-11 Jul 2007. |
|
Chan B.P., Hui T.Y., Yeung C.W., Li J., Mo F.Y. and Chan G.C.F., Self-assembled collagen–human mesenchymal stem cell microspheres for regenerative medicine, Biomaterials. 2007, 28: 4652-4666. |
|
Hui T.Y., In vitro chondrogenic differentiation of human mesenchymal stem
cells in collagen gels, M.Phil. Thesis. Hong Kong, The |
|
Hui T.Y., Cheung K.M.C., Cheung W.L., Chan D. and Chan B.P., In vitro chondrogenic differentiation of human mesenchymal stem cells in collagen microspheres: influence of cell seeding density and collagen concentration, Biomaterials. Elsevier Ltd., 2008, 29: 3201-3212. |
|
Researcher
: Hui TY |
|
List of Research Outputs |
|
Chan
B.P., Hui T.Y., Chan G.C.F., Chan D. and Cheung K.M.C., Collagen-mesenchymal stem
cell microspheres for regenerative medicine., World Forum for Spine
Research, Kyoto, Japan (Best oral pesentation award), Jan 23-26. |
|
Chan B.P., Hui T.Y., Chan G.C.F., Chan D. and Cheung K.M.C., Collagen-mesenchymal stem cell microspheres for regenerative medicine, Best Oral Presentation Award, World Forum for Spine Research - the intervertebral disc, first Japanese meeting, Kyoto, Japan, January 23-26, 2008. 2008. |
|
Chan
B.P., Hui T.Y., Yeung C.W. and Chan G.C.F., Self-Assembled
Collagen-Human Mesenchymal Stem Cell (hMSCs) Microspheres – Novel Bio-devices
for Cell Delivery, The 34th Annual Meeting and Exposition of the
Controlled Release Society, 7-11 Jul 2007. |
|
Chan B.P., Hui T.Y., Yeung C.W., Li J., Mo F.Y. and Chan G.C.F., Self-assembled collagen–human mesenchymal stem cell microspheres for regenerative medicine, Biomaterials. 2007, 28: 4652-4666. |
|
Hui T.Y., In vitro chondrogenic differentiation of human mesenchymal stem
cells in collagen gels, M.Phil. Thesis. Hong Kong, The |
|
Hui T.Y., Cheung K.M.C., Cheung W.L., Chan D. and Chan B.P., In vitro chondrogenic differentiation of human mesenchymal stem cells in collagen microspheres: influence of cell seeding density and collagen concentration, Biomaterials. Elsevier Ltd., 2008, 29: 3201-3212. |
|
Researcher
: Kou X |
|
List of Research Outputs |
|
Kou X. and Tan S.T., "Heterogeneous Object Design: An Integrated CAX Perspective" , In: Alexander Pasko, Valery Adzhiev, Peter Comninos, "Heterogeneous Objects Modeling and Applications", Lecture Notes in Computer Science. Springer, 2008, 4889. |
|
Kou X. and Tan S.T., "\CAD4D: A Novel CAD system for design in 4D space, Hong Kong ICT Awards 2007: Best Innovation and Research (Open) Certificate of Merit (Best Innovation), Hong Kong Internet Professional Association. 2008. |
|
Kou
X. and Tan
S.T., Design by talking with computers, International CAD Conference
and Exhibition (CAD'08). |
|
Researcher
: Lai KK |
|
List of Research Outputs |
|
Lai K.K., Two-dimensional computational study on indoor/outdoor air
quality relationship in urban buildings, M.Phil. Thesis. Hong Kong,
The |
|
Researcher
: Lam CK |
|
List of Research Outputs |
|
Chow K.W., Lam C.K. and Wong K.K.Y., Modulation Instabilities in a System of Four Coupled, Nonlinear Schrodinger Equations, Physics Letters A. 2008, vol. 372, no. 55: pp. 4596-4600. |
|
Chow K.W., Lam C.K., Nakkeeran K. and Malomed B.A., Transmission and stability of solitary pulses in complex Ginzburg – Landau equations with variable coefficients, Journal of the Physical Society of Japan. 2008, 77: 054001 (5 pages). |
|
Lam
C.K. and Chow
K.W., Solitary pulses in nonlinear Schrödinger (NLS) systems and
derivative NLS models, Dynamics Days Europe 2007, |
|
Researcher
: Lam HN |
|
Project Title: |
Design and production of an automatic cleaning and air drying system for kitchen floors |
|
Investigator(s): |
Lam HN |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
The |
|
Start Date: |
01/2005 |
|
Abstract: |
|
To carry out study on design and production of an automatic cleaning and air drying system for kitchen floors. |
|
Project Title: |
Innovative Environmentally Friendly Building-Integrated Ground-Source Heat Pump Systems for Building Air Conditioning |
|
Investigator(s): |
Lam HN |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Small Project Funding |
|
Start Date: |
04/2006 |
|
Abstract: |
|
The objectives of the research project
are to investigate the feasibility and detailed technical performance of a
ground-source heat pump system for building air conditioning with the heat
exchanger pipes embedded in the concrete building foundation piles so that
its potential for energy saving and environmental protection can be
identified. Conventional ground-source heat pump systems utilise the mass of
the earth as a heat sink when they operate in the cooling mode for comfort
air conditioning. These systems are highly energy-efficient and
environmentally friendly on account of the steady and lower temperature of
the ground and the absence of heat rejection into the ambient air. A large
number of deep bore holes down to a depth of at least |
|
List of Research Outputs |
|
Lam H.N., Improving High-rise Building Drainage System Performance and Reliability, Inno Design Tech Expo 2007 by Hong Kong Trade Development Council . 2007. |
|
Lee C.K. and Lam H.N., Computer Simulation of Borehole Ground Heat Exchangers for Geothermal Heat Pump Systems, Renewable Energy. 2008, 33: 1286-1296. |
|
Lee C.K. and Lam H.N., Effects of Groundwater Flow Direction on Performance of Ground Heat Exchanger Borefield in Geothermal Heat Pump Systems Using 3-D Finite Difference Method, Building Simulation 2007. 337-341. |
|
Researcher
: Lam J |
|
Project Title: |
Synthesis Techniques for Multidimensional Dynamic Systems with Delay and Stochastic Effects |
|
Investigator(s): |
Lam J |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
11/2004 |
|
Abstract: |
|
To study: (1) stability analysis for multidimensional systems with delay and stochastic effects; (2) development of performance-based synthesis and filtering techniques. |
|
Project Title: |
Admissibility Conditions and Performance-Based Stabilization of Singular Switched Systems |
|
Investigator(s): |
Lam J |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
10/2005 |
|
Abstract: |
|
The main objectives of this project are: 1: Admissibility Analysis for Singular Switched Systems To derive regularity, stability, and non-impulsiveness (causality) conditions for continuous and discrete singular switched systems. Both deterministic and stochastic techniques will be used for different switching mechanisms. 2: Development of Performance-based Stabilization Techniques To develop conditions for stabilization of switched systems based on the worst-gain and energy-to-peak gain performance theories. Both deterministic and stochastic stabilization methodologies involving full and reduced order control will be studied and compared. Numerically reliable and efficient design algorithms will be constructed. |
|
Project Title: |
Design of Feedback Controllers for Systems with Random Transmission Signal Failures |
|
Investigator(s): |
Lam J |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
03/2006 |
|
Abstract: |
|
In control engineering applications, the performance of feedback systems is dependent upon a continuous flow of measurement and control signals. Apart from possibly noise corruption, measurement and control signals may be delayed or even lost in the transmission process. A typical situation is when the control loop is implemented over a networked environment. Issues like networked-induced delay, data dropout and disordering are inevitable. This will naturally lead to a significant level of performance degradation or, in critical situations, instability of the closed-loop systems. In the past decade, more severe forms of control loop failures such as those due to the outage of sensors or actuators have been considered. These failures are consequences of hardware problems. In these situations, the signals involved will cease to transmit to the plants or the controllers, or fix at some constant values prior to the failures. Due to the severe stability and performance implications in the event of control system failure, there have been continuing efforts devoted to designing reliable feedback systems that guarantee the stability and basic performance even under the occurrence of these types of sensor or actuator faults. However, previous work in the synthesis of controllers to give reliable systems with faults are often unrealistic or conservative due to the assumptions imposed on the set of failure-prone sensors/actuators. Moreover, the faults considered in earlier developments are often treated as irrecoverable failures. These assumptions lead to controller synthesis results unnecessarily conservative. Instead, our focus will be on the possible signal transmission failures in the control channels. When properly modeled, the failures may be viewed as recoverable and governed by certain probabilistic descriptions. Such failures include intermittent lost of signal data (due to network conditions) or, in the extreme case, system component failures (rare but with slow recovery). In this project, feedback control design techniques will be developed with the aim of relaxing the restriction that a specific subset of sensors or actuators is only allowed to fail and that the failures are irrecoverable. Instead, a probabilistic description will be introduced to cater possibly random transmission signal failures over the whole set (or a subset) of sensors or actuators. Moreover, control over a networked environment will be considered with data packet dropouts or delay. Stabilization incorporating additional control objectives such as the H-infinity and H2 measures will also be studied. To facilitate the computation of the required controllers, numerical algorithms will be developed for the solution of these performance-based reliable controllers in the form of convex optimization. |
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Project Title: |
Decay rate estimation and synthesis of functional differential systems via semi-definite programming |
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Investigator(s): |
Lam J |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
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Start Date: |
11/2006 |
|
Abstract: |
|
(1) To develop stability conditions with decay rates for functional differential systems Estimating the decay rate of dynamic systems has long been an area of both theoretical and practical concern. Most long-established methods for decay rate estimation are either imprecise or require the solution of transcendental equations, while more recent approaches involve certain levels of conservatism in their estimates. The improved delay-dependent stability conditions to be developed will give enhanced decay rate estimates. This involves novel construction of Lyapunov-Krasovskii functionals and techniques to introduce degrees of freedom in the stability criteria. To facilitate computation, the estimation problems will be formulated as semi-definite programming tasks. The results should enable the decay characteristics in many engineering applications involving functional differential equations to be properly quantified for the first time, and will also suggest techniques for reducing the conservatism of stability and performance conditions related to these systems. (2) To extend the decay rate estimation techniques for general uncertain dynamic systems Many important classes of functional differential systems employed to describe engineering processes involve impulsive and stochastic characteristics. Based on improved conditions and techniques, the objective is to develop decay rate estimates for these classes of systems. As this requires specialized analytical tools, relatively little research has been done in this area. As the knowledge of their decay rates is important in assessing the stability profile of these systems, the results developed will be useful not only for system analysis but also for synthesis tasks. Neural networks represent another class of functional differential systems. Most exponential stability conditions and decay rate estimates developed in this area are conservative since strong bounding techniques are often involved in their derivations. The results developed in this project will provide novel ideas and techniques for exponential estimates in these areas. (3) To design controllers and filters for functional differential systems with specified/optimized decay rates Little research has been done on design performance-based controllers or filters for functional differential systems with explicit decay rate specification. The reason is partly due to a lack of easily utilizable decay rate conditions, which can be incorporated into synthesis tasks with performance. We aim to fill this gap by applying the decay rate estimation results developed to synthesize controllers and filters which give exponentially stable closed-loop and filtering characteristics with prescribed/optimized decay rates amongst other application-oriented performances. Numerically reliable algorithms will be constructed based on the linear matrix inequality approach. The results will provide designers with the necessary theoretical and numerical tools for their applications. |
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Project Title: |
Model Simplification of Systems with Structural Constraints |
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Investigator(s): |
Lam J |
|
Department: |
Mechanical Engg |
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Source(s) of Funding: |
Seed Funding Programme for Basic Research |
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Start Date: |
03/2007 |
|
Abstract: |
|
In the state-space modelling of certain engineering, economic and biological processes, the state variables used to represent the physical parameters often have fixed signs. The time evolution trajectories of these physical variables are therefore confined to an orthant in the state space. For instance, quantities such as time, money, animal and plant populations, concentration of chemicals can only admit positive values and thus imposing strong structural constraints on the system dynamics. Under appropriate diffeomorphisms, these systems can be transformed into different classes of positive systems. Systems with positivity have received a lot of attention in recent years. Apart from addressing the fundamental system-theoretic issues like stability, controllability, and realizability, most of the research results are focused on fairly restrictive classes of positive systems. Due to the technical difficulties in handling the positivity constraints, comparatively very little analysis and synthesis results obtained for general state-space systems have been extended to systems under such constraints. Another type of structural constraints imposed to systems modelled by the finite element approach is the positive semidefiniteness of system matrices. For instance, the dynamic models describing the vibration of engineering structures are invariably given in the form of second-order matrix differential equations. The mass, stiffness, and damping matrices are typical positive semidefinite in nature. Feedback control with collocated actuators and sensors will preserve such a property. In practical applications of these two types of structurally constrained systems, the number of state variables may be huge in order to accurately describe the behaviour of these models. To improve the modelling accuracy the dynamics of engineering systems or physical processes, mathematical models describing their dynamics, be they obtained from finite element modelling or identification techniques, are often necessarily of high orders. The large number of state variables in such models not only will decrease the efficiency of analysis, they may even lead to excessive computational time to an extent that simulation or real-time applications become impossible. On the other hand, from a synthesis point of view, the construction of controllers or filters for such dynamic systems based on these high-order models will encounter implementation difficulties. This is because modern performance-based synthesis techniques based on dynamic output feedback will give rise to controller dimensions no less than those of the system models (assuming that frequency weightings and full-order controllers are used). Consequently, there is a need to simplify these high-order models so that they are of size amenable to analysis and synthesis.In this project, model simplification techniques will be developed to reduce the dimensions of structurally constrained systems. Two types of structurally constrained systems will be considered, one involves the positivity of the system dynamics and the other has positive (semi)definite system matrices. Approaches based on controllability and observability measures, as well as optimality related to control-oriented performance indices, will be used to generate the reduced-order models with possibly guaranteed accuracy. Numerically reliable and efficient computational algorithms will be constructed for the computation of desired reduced models. |
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List of Research Outputs |
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Du H., Zhang N. and Lam J., Computation of Robust H-infinity Controllers for Time-Delay Systems via Genetic Algorithms, Control and Intelligent Systems. 2007, 35: 395--400. |
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Feng J., Lam J., Xu S. and Shu Z., Optimal stabilizing controllers for linear discrete-time stochastic systems, Optimal Control Applications and Methods. 2008, 29(3): 243-253. |
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Feng J., Lam J., Xu S. and Shu Z., Stabilization of stochastic systems with optimal decay rate, IET Journal of Control and Applications. 2008, 2(1): 1-6. |
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Gao H., Chen T. and Lam J., A new delay system approach to networked based control, Automatica. Elsevier Ltd., 2008, 44(1): 39-52. |
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Gao H., Lam J. and Wang Z., Discrete bilinear stochastic systems with time-varying delay: Stability analysis and control synthesis, Chaos, Solitons, and Fractals. Elsevier Ltd., 2007, 34(2): 394-404. |
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Gao H., Lam J., Chen T. and Wang C., Feedback control with signal transmission after-effects, International Journal of Robust & Nonlinear Control. John Wiley & Sons, Ltd., 2008, 18(3): 351-363. |
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Huang X., Lam J., |
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Lam J., Associate Editor , International Journal of Applied Mathematics and Computer Science. 2008. |
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Lam J., Associate Editor, Asian Journal of Control. 2008. |
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Lam J., Associate Editor, Automatica. 2008. |
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Lam J., Associate Editor, Conference Editorial Board of IEEE Control Systems Society. 2008. |
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Lam J., Associate Editor, Dynamics of Continuous, Discrete, and Impulsive Systems – Series B. 2007. |
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Lam J., Associate Editor, IEEE Transactions on Signal Processing. 2008. |
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Lam J., Associate Editor, International Journal of Systems Science. 2008. |
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Lam J., Associate Editor, Journal of Sound and Vibration. 2008. |
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Lam J., Associate Editor, Journal of The Franklin Institute. 2008. |
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Lam
J., Control of Discrete Positive Linear
Systems, |
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Lam J. and Zhou S., Gain-scheduled H¥ controller design for discrete-time systems via parameter-dependent lyapunov functions, International Journal of Information and Systems Science. Insitute for Scientific Computing and Information, 2008, 4(2): 191-203. |
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Lam J., Member of Editorial Board, IET Control Theory and Applications. 2008. |
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Lam J., Member of Editorial Board, International Journal of Systems, Control and Communications. 2008. |
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Lam J., Member of Editorial Board, Research Letters in Signal Processing. 2008. |
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Lam J., Member of Editorial Board, The Open Automation and Control Journal. 2008. |
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Lam J., Member of Editorial Board, The Open Electrical and Electronic Journal. 2008. |
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Lam
J., Stability and Stabilization Conditions
for Discrete Positive Systems, |
|
Lam
J., Stability and Stabilization Conditions
for Discrete Positive Systems, |
|
Li Y., Lam J. and Luo X., Convex optimization approaches to robust L1 fixed-order filtering for polytopic systems with multiple delays, Circuits, Systems, and Signal Processing. 2008, 27(1): 1-22. |
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Mou S., Gao H., Lam J. and Qiang W., A new criterion of delay-dependent asymptotic stability for hopfield neural networks with time delay, IEEE Transactions on Neural Networks. IEEE, 2008, 19(3): 532-535. |
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Sun M., Lam J., Xu S. and Zou Y., Robust exponential stabilization for uncertain markovian jump systems with input delay, Automatica. Elsevier Ltd., 2007, 43(10): 1799-1807. |
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Wang Q., Lam J., Wei Y. and Chen T., Iterative solutions of coupled discrete markovian jump lyapunov equations, Computers and Mathematics with Applications. Elsevier Ltd., 2008, 55(4): 843-850. |
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Wu L., Lam J., Paszke W., Galkowski K. and
Rogers E., Control of discrete linear repetitive processes with H¥ and l2-l¥ performance, American
Control Conference. |
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Wu L. and Lam J., Hankel-type model reduction for linear repetitive processes: Differential and discrete cases, Multidimensional Systems and Signal Processing. Springer, 2008, 19(1): 41-78. |
|
Wu L., Lam J., Paszke W., Galkowski K. and Rogers E., Robust H¥ filtering for uncertain differential linear repetitive processes, International Journal of Adaptive Control and Signal Processing. John Wiley & Sons, Ltd., 2008, 22(3): 243-265. |
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Xu H., Xu S. and Lam J., Positive real control for two-dimensional discrete time-delay systems via output feedback controller, Journal of Computational and Applied Mathematics. Elsevier B.V., 2008, 216(1): 87-97. |
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Xu S., Lam J. and Zou Y., An improved characterization of bounded realness for singular delay systems and its applications, International Journal of Robust & Nonlinear Control. John Wiley & Sons, Ltd., 2008, 18(3): 263-277. |
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Xu S., Lam J. and Ho D.W.C., Delay-dependent asymptotic stability of neural networks with time-varying delays, International Journal of Bifurcation and Chaos. Worlds Scientific Publishing Company, 2008, 18(1): 245-250. |
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Xu S., Lam J. and Mao X., Delay-dependent H¥ control and filtering for uncertain markovian jump systems with time-varying delays, IEEE Transactions on Circuits and Systems I. IEEE, 2007, 54(9): 2070–2077. |
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Xu S., Song B., Lu J. and Lam J., Robust stability of uncertain discrete-time singular fuzzy systems, Fuzzy Sets and Systems. Elsevier B.V., 2007, 158(20): 2306–2316. |
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Xu S., Lam J., Zou Y., Lin Z. and Galkowski K., H¥ output feedback control for two-dimensional continuous systems, Dynamics of Continuous, Discrete and Impulsive Systems. Watam Press, 2008, 14(1): 1-14. |
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List of Research Outputs |
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Cheng S.W.K., Lam S.K., Fung S.K. and Ho J.P., A Computational Fluid Dynamic Study of Stent Graft Remodeling after Endovascular Repair of Thoracic Aortic Dissections, 22nd Annual Meeting of the Western Vascular Society. 2007. |
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Fung S.K., Lam S.K., Cheng S.W.K. and Chow K.W., On stent graft models in thoracic aortic endovascular repair: A computational investigation of the hemodynamic factors, Computers in Biology and Medicine. 2008, 38: 484 - 489. |
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Lam S.K., Fung S.K., Cheng S.W.K. and Chow K.W., A Computational Investigation on the Effect of Biomechanical Factors Related to Stent-graft Models in the Thoracic Aorta, International Conference of the IEEE Engineering in Medicine and Biology Society, in conjunction with the Biennial Conference of the French Society of Biological and Medical Engineering, Lyon, France. 2007. |
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List of Research Outputs |
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Cheng S.W.K., Lam S.K., Fung S.K. and Ho J.P., A Computational Fluid Dynamic Study of Stent Graft Remodeling after Endovascular Repair of Thoracic Aortic Dissections, 22nd Annual Meeting of the Western Vascular Society. 2007. |
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Fung S.K., Lam S.K., Cheng S.W.K. and Chow K.W., On stent graft models in thoracic aortic endovascular repair: A computational investigation of the hemodynamic factors, Computers in Biology and Medicine. 2008, 38: 484 - 489. |
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Lam S.K., Fung S.K., Cheng S.W.K. and Chow K.W., A Computational Investigation on the Effect of Biomechanical Factors Related to Stent-graft Models in the Thoracic Aorta, International Conference of the IEEE Engineering in Medicine and Biology Society, in conjunction with the Biennial Conference of the French Society of Biological and Medical Engineering, Lyon, France. 2007. |
|
Researcher
: Lam TF |
|
List of Research Outputs |
|
Lam T.F., Nesting of 2D parts with complex geometry and material
heterogeneity, M.Phil. Thesis. Hong Kong, The |
|
Researcher
: Lau MW |
|
List of Research Outputs |
|
Lau M.W., On the early development of dispersion in flow through a tube
with wall reactions, M.Phil. Thesis. Hong Kong, The |
|
Lau M.W. and Ng C.O., On the early
development of dispersion in flow through a tube with wall reactions, Proceedings
of |
|
Lau M.W. and Ng C.O., On the early
development of dispersion in flow through a tube with wall reactions, Proceedings
of the Fifth International Conference on Fluid Mechanics, |
|
Researcher
: Lee CK |
|
List of Research Outputs |
|
Lee C.K. and Lam H.N., Computer Simulation of Borehole Ground Heat Exchangers for Geothermal Heat Pump Systems, Renewable Energy. 2008, 33: 1286-1296. |
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Lee C.K. and Lam H.N., Effects of Groundwater Flow Direction on Performance of Ground Heat Exchanger Borefield in Geothermal Heat Pump Systems Using 3-D Finite Difference Method, Building Simulation 2007. 337-341. |
|
Researcher
: Lee SH |
|
List of Research Outputs |
|
Zhou W., Lee S.H., Wang M., Cheung W.L. and Ip W.Y., Selective Laser Sintering Of Porous Tissue Engineering Scaffolds From Poly(l-lactide)/carbonated Hydroxyapatite Nanocomposite Microspheres, Journal Material Sci: Mater Med. 2007, 19: 2535-2540. |
|
Researcher
: Leung MKH |
|
Project Title: |
Indoor air quality control and mitigation measures for printing plants |
|
Investigator(s): |
Leung MKH |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Occupational Safety and Health Council - Research Grant Projects |
|
Start Date: |
03/2003 |
|
Abstract: |
|
To study the existing IAQ conditions and
develop useful Engineering Control Measures for the printing industry in |
|
Project Title: |
Local exhaust ventilation for protection against nosocomial infection of SARS |
|
Investigator(s): |
Leung MKH |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
VCO SARS Research Fund |
|
Start Date: |
07/2003 |
|
Abstract: |
|
To develop a local exhaust ventilation system that removes droplets and bioaersols effectively so as to reduce the risk of nosocomial SARS infection during the peformance of intubation and surgical procedures for SARS patients. |
|
Project Title: |
Environmental friendly cold water thawing for catering industry |
|
Investigator(s): |
Leung MKH |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Environmental Research, Technology Demonstration Projects |
|
Start Date: |
07/2003 |
|
Abstract: |
|
To carry out a Computational Fluid Dynamic (CFD) analysis for the abovementioned defrosting processes and optimise the process parameters, including the position of the frozen meat and flow rate of the town water; to investigate computationally the additional use of a rotating mechanism inside the deforesting water pail to enhance the cold water thawing process; to conduct experimental study to verify the performance of the best cold water thawing process identified from the above analytical investigation; to conduct field test in selected restaurants and collect data to determine the saving in water consumption. |
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Project Title: |
Novel local exhaust ventilation device for printing industry |
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Investigator(s): |
Leung MKH |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
The |
|
Start Date: |
10/2004 |
|
Abstract: |
|
To design a novel Local Exhaust Ventilation (LEV) device to protect the workers by removing the VOCs effectively. |
|
Project Title: |
Development of theoretical solutions to predict the transient phase-change heat and mass transfer for multiple industrial applications |
|
Investigator(s): |
Leung MKH, Leung YC, Liu CH |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
04/2005 |
|
Abstract: |
|
The main objectives of this research are: 1) To derive a general theoretical solution to this nonhomogeneous problem. 2) To design computational techniques that determine the movement of an interface whose behavior highly depends on the nature and characteristics of individual industrial process. 3) To define proper equivalent material properties that can be substitutes for any temperature-dependent material properties for accurate theoretical prediction. |
|
Project Title: |
Solar Photocatalysis of Metal Ion Implanted Sol-Gel TiO2 Thin Film Coated on Light-Transmitting Substrate |
|
Investigator(s): |
Leung MKH |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
04/2006 |
|
Abstract: |
|
Key issues and problems: Photocatalysis of transparent sol-gel nano titanium dioxide (TiO2) thin films coated on light-transmitting glass substrates has many potential applications in various aspects, including water purification, air purification, hydrogen production, and self-cleaning windows. The light-transmitting glass substrate can significantly increase the irradiated surface area due to the optic fiber effect. The useful spectral range can be extended from UV to visible light when the TiO2 catalyst is implanted with metal ion, such as chromium (Cr) or vanadium (V). Such monolith photoreactors are particularly suitable for the use of sunlight as the solar UV and visible light can be transmitted from the upper surface to the lower layers, resulting in complete activation of all immobilized photocatalyst. In this research, a theoretical model will be developed to simulate the heterogeneous photocatalytic kinetics of the thin film and the water/air purification effect of the monolith photoreactor. Preivous research has shown the promise of photoreactors made of UV-transmitting glass substrates coated with sol-gel TiO2 thin films [1-6]. Further development needed is to investigate the shift of absorption band from UVA to the full solar spectrum. Metal ion implantation has been identified as the most suitable method to shift the absorption band. The limited research works done on ion implanted TiO2 were mostly conducted by Anpo [7]. The effects of the thin film properties, photoreactor design, and operational parameters on the photocatalytic performance are not yet fully understood. The fundamental molecular photocatalytic kinetics of the ion-implanted catalyst is of particular importance. Further theoretical and experimental studies are needed to facilitate engineering design and control. Project objectives: In order to address the abovementioned issues, the research will be carried out with the following key objectives: (1) The promising photocatalytic module made of Cr- or V-implanted sol-gel nano-TiO2 thin film coated on light-transmitting glass substrate will be thoroughly characterized in four categories: (i) adsorption of chemicals, (ii) spectral absorption, (iii) photocatalytic degradation of organic compounds, and (iv) photocatalytic destruction of microorganisms. (2) A theoretical model will be developed to simulate and predict the electron-hole formation and recombination behaviors. The model will be used to optimize the design of the thin film with proper physical and chemical properties. (3) In conjunction with fluid dynamics and quantum mechanics, a computational model will be implemented to predict the performance of a thin film photoreactor on water and air purification. (4) The computational model will be used as a design tool to optimize the photoreactor design for water and air purification. (5) Experimental investigation on photocatalytic water/air detoxification and disinfection will be conducted in order to validate the computational model and to test the performance of the optimally designed photoreactor. |
|
List of Research Outputs |
|
Leung
M.K.H. and Yiu C.W., Design optimization of
photocatalytic glass tubular honeycomb reactor for air purification, ISES
Solar World Congress 2007. |
|
Leung
M.K.H., Engineering Control of Indoor Air
Quality in |
|
Leung M.K.H., Humidity control for better IAQ - Energy efficient heat-pump desiccant dehumidifier, In: CLP Energy Efficiency Exhibition Centre, Indoor Air Quality Workshop & Product Display. 2007. |
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Leung M.K.H., Innovation of Energy Efficient Heat Pumps, CAI-IET Joint Symposium on Green Energy and Control Technologies, The Hong Kong Institution of Engineers (Control, Automation and Instrumentation Division) and Institution of Engineering and Technology Hong Kong. 2008. |
|
Leung
M.K.H., Innovation of energy efficient heat
pumps, CAI-IET Joint Symposium on Green Energy and Control Technologies.
|
|
Leung M.K.H., Leung Y.C., Yam W.C. and Ng S.P., Light-transmitting tubular-honeycomb photocatalytic reactor, Patent, Publication no.: 1099477. 2007, 12 pages. |
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Leung M.K.H., New technologies for treatment of indoor air, Green Building Heating, Ventilating and Air-conditioning (HVAC) Operation & Maintenance, Business Environment Council. 2008. |
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Leung M.K.H., Photocatalytic Glass Tubular Honeycomb Reactor Air Purification, World SME Expo and Inno Design Tech Expo, Hong Kong Trade Development Council. 2007. |
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Leung M.K.H., Man H.C. and Yu J.K., Theoretical and experimental studies on laser transformation hardening of steel by customized beam, International Journal of Heat and Mass Transfer. 2007, 50(23-24): 4600-4606. |
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Leung
M.K.H., Ni
M. and Leung Y.C., Theoretical
models for design optimization of hydrogen fuel cells and electrolyzers, In:
International Association for Hydrogen Energy and Australian Institute of
Energy, 17th World Hydrogen Energy Conference, |
|
Leung M.K.H., Thermal environment, Training Schedule for Introductory Ergonomics, The Hong Kong Ergonomics Society. 2008. |
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Leung Y.C., Leung M.K.H. and Ni M., A review of the photocatalytic degradation of volatile orgainc compounds (VOCs) in indoor air, The Catalyst Review. Bethlehem Pike, USA, Catayst Group, 2008, April issue: 5-13. |
|
Li Y.,
Ching W.H., Qian H., Yuen P.L., Seto W.H., Kwan J.K., Leung J.K.C., Leung M.K.H. and Yu S.C.T., An
evaluation of the ventilation performance of new SARS isolation wards in nine
hospitals in |
|
Li Y.,
Leung M.K.H., Seto W.H., Yuen P.L., Leung J.K.C., Kwan J.K. and Yu S.C.T.,
Factors affecting ventilation effectiveness in SARS wards, Hong Kong
Medical Journal. |
|
Ni M., Leung Y.C. and Leung M.K.H., A review on reforming bio-ethanol for hydrogen-rich gas production, International Journal of Hydrogen Energy. 2007, 32: 3238-3247. |
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Ni M., Leung M.K.H. and Leung Y.C., Energy and exergy analysis of hydrogen production by solid oxide steam electrolyzer plant, International Journal of Hydrogen Energy. 2007, 32: 4648-4660. |
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Ni M., Leung M.K.H. and Leung Y.C., Mathematical modeling of proton-conducting solid oxide fuel cells and comparison with oxygen-ion-conducting counterpart, Fuel Cells. 2007, 7: 269-278. |
|
Ni M., Leung M.K.H. and Leung Y.C., Mathematical modeling of the coupled transport and electrochemical reactions in solid oxide steam electrolyzer for hydrogen production, Electrochimica Acta. 2007, 52: 6707-6718. |
|
Ni M., Leung M.K.H. and Leung Y.C., Parametric study of solid oxide steam electrolysis for hydrogen production, International Journal of Hydrogen Energy . 2007, 32: 2305-2313. |
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Ni M., Leung M.K.H. and Leung Y.C., Study on gas transfer within solid oxide fuel cell cathode, Chinese Journal of Power Sources. 2007, 31: 777-778. |
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Ni M., Leung M.K.H. and Leung Y.C., Technological developments in hydrogen production by solid oxide steam electrolyzer, International Journal of Hydrogen Energy . 2008, 33: 2337-2354. |
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Ni M., Leung M.K.H. and Leung Y.C., Theoretical analysis of reversible solid oxide fuel cell based on proton-conducting electrolyte, Journal of Power Sources . 2008, 177: 369-375. |
|
Ni M., Leung M.K.H. and Leung Y.C., Theoretical modeling of the electrode thickness effect on maximum power point of dye-sensitized solar cell, Canadian Journal of Chemical Engineering. 2008, 86: 35-42. |
|
Researcher
: Leung YC |
|
Project Title: |
Development of a three-dimensional numerical model for air pollution study in urban street canyons |
|
Investigator(s): |
Leung YC, Lam KM |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
12/2003 |
|
Abstract: |
|
To develop a three-dimensional computation model for street canyon flow; to validate and fine-tune the model using physical modelling technique; to investigate the characteristics of the flow in street canyons with different configurations using the validated model. |
|
Project Title: |
Numerical investigation of the physical and chemical processes of air pollutants in urban street canyons |
|
Investigator(s): |
Leung YC, Liu CH |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2005 |
|
Abstract: |
|
To improve our understanding and to supplement experimental findings of the physical and chemical processes that occur in urban street canyons; to enhance current urban design practice and air polluation control strategy by conducting comprehensive sensitivity tests. |
|
Project Title: |
Performance test of a pilot FGD system |
|
Investigator(s): |
Leung YC |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
|
|
Start Date: |
11/2005 |
|
Abstract: |
|
To carry out performance test of a pilot FGD system. |
|
Project Title: |
Photocatalytic production of clean and renewable hydrogen fuel |
|
Investigator(s): |
Leung YC, Leung MKH |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2006 |
|
Abstract: |
|
The objectives of this project are: (1) To investigate characteristics of nano-semiconductor photocatalytic hydrogen production. (2) To develop a new photocatalyst with high energy conversion efficiency using the visible light spectrum and to study its characteristics in hydrogen production. (3) To develop and validate a simulation model to predict hydrogen production using the newly developed photocatalyst, based on experimental work. |
|
Project Title: |
Air pollution in
|
|
Investigator(s): |
Leung YC |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
05/2006 |
|
Abstract: |
|
In recent years, vehicular emission
control program implemented by the HKSAR Government has lowered the
concentration of some of the air pollutants such as respirable suspended
particulates and nitrogen oxides , mainly at the street level (HKEPD 2003).
However, very little improvement in air quality can be felt by the general
public. Many studies have revealed that the air pollution in |
|
Project Title: |
The impact of
biogenic volatile organic compounds on regional-scale ozone episodes and air
quality problems in |
|
Investigator(s): |
Leung YC, Liu CH |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
10/2006 |
|
Abstract: |
|
(1) Project Purposes and Objectives The
aim of this project is to determine the contribution of biogenic volatile
organic compounds (VOCs) to the production of tropospheric ozone in the |
|
Project Title: |
Economic production of hydrogen fuel using scrap metals |
|
Investigator(s): |
Leung YC, Leung MKH |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
05/2007 |
|
Abstract: |
|
Objectives:a. To investigate the chemical kinetics of the reaction between metals and seawaterb. To explore the characteristics of hydrogen production from the above process;c. To optimize the hydrogen production efficiency of the process. Key issues and problems to be addressed:Hydrogen is a clean, renewable, and efficient energy source, which may well replace existing fossil fuel based energy sources. There are lot of researches on developing economical and clean techniques for producing hydrogen that can be used for internal combustion engines or fuel cells. The use of waste metals is an innovative technology that has high potential for producing hydrogen economically and cleanly. Some metals and alloys, such as magnesium, possess high chemical energy that can produce hydrogen gas from hydrolysis of the metals as shown below (take magnesium as an example): Mg + 2 H2O --> Mg(OH)2 + H2However, the hydrogen production rate in the above chemical process is quite low under normal circumstances. Until its energy conversion efficiency can be improved hydrogen production by this means will remain uneconomic. One way of improvement is the use of catalyst (such as platinum) and NaCl aqueous solution for enhancing the reaction rate. The main challenge in this study is, therefore, to study the chemical kinetics of the reaction process so as to develop a way to produce hydrogen efficiently using scrap metals that have no commerical values. It is anticipated to obtain the best operation conditions for the reaction process. Possible outcomes and long-term impact:The study will provide a better understanding on the mechanisms of hydrogen production during the hydrolysis reaction between metals and its reactant. An innovative and economic method of producing hydrogen will be developed. The project will make an important contribution towards the development of a clean and sustainable hydrogen economy. Furthermore, the success of this project can help reducing the pressure of solid waste disposal. |
|
List of Research Outputs |
|
Leung M.K.H., Leung Y.C., Yam W.C. and Ng S.P., Light-transmitting tubular-honeycomb photocatalytic reactor, Patent, Publication no.: 1099477. 2007, 12 pages. |
|
Leung
M.K.H., Ni M. and Leung Y.C., Theoretical models for
design optimization of hydrogen fuel cells and electrolyzers, In:
International Association for Hydrogen Energy and Australian Institute of
Energy, 17th World Hydrogen Energy Conference, |
|
Leung Y.C., Leung M.K.H. and Ni M., A review of the photocatalytic degradation of volatile orgainc compounds (VOCs) in indoor air, The Catalyst Review. Bethlehem Pike, USA, Catayst Group, 2008, April issue: 5-13. |
|
Leung Y.C., Editorial Board Member , In: Leung Y.C., Applied Energy (Editorial Board Member). Elsevier, 2008. |
|
Leung
Y.C., Renewable energy and solar car design, Invited
talk at |
|
Leung Y.C., Liu C.H., Kwok K.T. and Vrijmoed L.L.P., Study on the biogenic VOCs emissions of Hong Kong, 3rd International Symposium on Environment. Athens, Greece, Athens Institute for Education & Research, 2008, 21pp. |
|
Li
X., Liu C.H. and Leung Y.C., Large-eddy simulation of
flow and pollutant dispersion in urban street canyons of high aspect ratios, 7th
Symposium on Urban Environment. |
|
Li
X., Leung Y.C., Liu C.H. and Lam K.M., Physical modelling of flow
field inside urban street canyons, Journal of Applied Meteorology &
Climatology. |
|
Liu C.H. and Leung Y.C., Numerical study on the ozone formation inside street canyons using a chemistry box model, Journal of Environmental Sciences. 2008, 20: 832-837. |
|
Memon
R.A., Leung Y.C. and Liu C.H., A review on the generation,
determination and mitigation of urban heat island, Journal of
Environmental Science. |
|
Ni M., Leung Y.C. and Leung M.K.H., A review on reforming bio-ethanol for hydrogen-rich gas production, International Journal of Hydrogen Energy. 2007, 32: 3238-3247. |
|
Ni M., Leung M.K.H. and Leung Y.C., Energy and exergy analysis of hydrogen production by solid oxide steam electrolyzer plant, International Journal of Hydrogen Energy. 2007, 32: 4648-4660. |
|
Ni M., Leung M.K.H. and Leung Y.C., Mathematical modeling of proton-conducting solid oxide fuel cells and comparison with oxygen-ion-conducting counterpart, Fuel Cells. 2007, 7: 269-278. |
|
Ni M., Leung M.K.H. and Leung Y.C., Mathematical modeling of the coupled transport and electrochemical reactions in solid oxide steam electrolyzer for hydrogen production, Electrochimica Acta. 2007, 52: 6707-6718. |
|
Ni M., Leung M.K.H. and Leung Y.C., Parametric study of solid oxide steam electrolysis for hydrogen production, International Journal of Hydrogen Energy . 2007, 32: 2305-2313. |
|
Ni M., Leung M.K.H. and Leung Y.C., Study on gas transfer within solid oxide fuel cell cathode, Chinese Journal of Power Sources. 2007, 31: 777-778. |
|
Ni M., Leung M.K.H. and Leung Y.C., Technological developments in hydrogen production by solid oxide steam electrolyzer, International Journal of Hydrogen Energy . 2008, 33: 2337-2354. |
|
Ni M., Leung M.K.H. and Leung Y.C., Theoretical analysis of reversible solid oxide fuel cell based on proton-conducting electrolyte, Journal of Power Sources . 2008, 177: 369-375. |
|
Ni M., Leung M.K.H. and Leung Y.C., Theoretical modeling of the electrode thickness effect on maximum power point of dye-sensitized solar cell, Canadian Journal of Chemical Engineering. 2008, 86: 35-42. |
|
Xie X., Liu C.H. and Leung Y.C., Impact of building
facades and ground heating on wind flow and pollutant transport in street
canyons, Atmospheric Environment. |
|
Researcher
: Li CH |
|
List of Research Outputs |
|
Chan B.P., Li C.H., Au-yeung K.L., Sze K.Y. and Ngan A.H.W., A microplate compression method for elastic modulus measurement of soft and viscoelastic collagen microspheres, Annals of Biomedical Engineering. Biomedical Engineering Society, 2008, 36(7): 1254-1267. |
|
Li C.H.,
Ngan A.H.W., Sze K.Y. and Chan B.P., Microplate manipulation of
human mesenchymal stem cells (hMSCs) - collagen microspheres, World Forum
for Spine Research the Intervertebral Disc. |
|
Researcher
: Li X |
|
List of Research Outputs |
|
Li X., Liu C.H. and Leung Y.C., Large-eddy simulation of
flow and pollutant dispersion in urban street canyons of high aspect ratios, 7th
Symposium on Urban Environment. |
|
Li X., Leung Y.C., Liu C.H. and Lam K.M., Physical modelling of flow
field inside urban street canyons, Journal of Applied Meteorology &
Climatology. |
|
Researcher
: Li Y |
|
Project Title: |
A theory of enclosure ventilation driven by combined forces |
|
Investigator(s): |
Li Y, Chan ATY |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
09/2002 |
|
Abstract: |
|
Ventilation flow in an enclosure driven by combined natural and mechanical forces is fundamental to hybrid ventilation as well as to smoke control by mechanical extract. The current study is to understand how each driving force contributes to the overall force (pressure), ventilation flow rate, and flow pattern. |
|
Project Title: |
Dispersion and ventilation control of exhalation pollutants in hospital wards |
|
Investigator(s): |
Li Y, Chwang ATY |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
11/2004 |
|
Abstract: |
|
To investigate the dispersion of exhalation gases and droplets from a single person; to investigate the interaction of inhalation and exhalation flows bewteen two persons in hospital settings using both experimental and computational methods; to comparie the existing ventilation systems for large hospital wards using both experimental and computational methods; to develop of new ventilation systems for large hospital wards; to apply the present findings to transmission routes analysis. |
|
Project Title: |
Understanding droplets due to the use of nebulizers and respiratory activities |
|
Investigator(s): |
Li Y, Chwang ATY, Seto WH, Ho PL |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Research Fund for the Control of Infectious Diseases - Full Grants |
|
Start Date: |
12/2004 |
|
Abstract: |
|
The present project is to provide new data on the number and size distribution of droplets expelled during respiratory activities and when using a nebulizer and taking nasopharyngeal aspirates; and investigate how far droplets travel as well as how the size of droplets changes, with a vew of providing essential data for studying transmission routes of respiratory diseases such as SARS and their ventilation control. |
|
Project Title: |
Evaluating factors that affect ventilation effectiveness in SARS wards |
|
Investigator(s): |
Li Y, Leung MKH, Seto WH, Yu SCT |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Research Fund for the Control of Infectious Diseases - Full Grants |
|
Start Date: |
12/2004 |
|
Abstract: |
|
Between July and October 2003, the Hong Kong Government has constructed a large number of new SARS wards with more than 1,200 beds in 9 hospitals. A large number of these new SARS wards have multiple beds (2 or 4 beds). This project is to study the factors affecting the effectiveness of these new SARS wards in terms of air distribution and the removal of virus aerosols. The outcomes will facilitate decision making in various ventilation designs in different hospitals. |
|
Project Title: |
Interaction between natural ventilation and wind flow around a multi-storey building |
|
Investigator(s): |
Li Y, Seifert J |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Germany/Hong Kong Joint Research Scheme |
|
Start Date: |
01/2005 |
|
Abstract: |
|
To understand the mechanisms of interaction between wind flow around and through a multi-storey building; to improve the existing rediction methods for natural ventilation in multi-storey buildings. |
|
Project Title: |
Nonlinear coupling of thermal mass and natural ventilation in buildings |
|
Investigator(s): |
Li Y |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
09/2005 |
|
Abstract: |
|
The objectives of this project are: 1. To
develop a fundamental understanding of the nonlinear coupling of natural
ventilation and thermal mass with a focus on night ventilation; 2. To develop
effective simple design methods of using thermal mass and night ventilation
for the conceptual and detailed design stage; 3. To evaluate the potential of
using thermal mass and night ventilation in various Chinese locations,
including Hong Kong. Work programme Phase I: Theoretical Development IA.
Effect of internal thermal mass on night ventilation IB. Combined effect of
insulation and external thermal mass with a constant ventilation flow rate
ID. Combined effect of internal and external thermal mass on night
ventilation Phase II: Design Methods and Potential Analysis IIA. Design
parameters using virtual sphere for internal thermal mass IIB. Evaluating
thermal mass effect in realistic buildings using combined multi-zone thermal
and air flow modeling. The use of thermal mass and night ventilation will be
tested in one existing full-scale test room in Dalian, (But not in Beijing,
Shanghai, Xi’an and Hunan). (Software + one test =
HK$75000+HK$55000=HK$130000) IIC. Understanding the potential of using
thermal mass in |
|
Project Title: |
Full-scale study of air conditioning systems for SARS wards |
|
Investigator(s): |
Li Y |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Other Funding Scheme |
|
Start Date: |
06/2006 |
|
Abstract: |
|
This project proposal is to undertake a preliminary research study to construct a full-scale mock-up test chamber for SARS wards and to investigate the performance of a new air-conditioning system designed by SARS-Busters. The full-scale test room was completed in less than 4 weeks time between late May and middle June. The air conditioning system tests was completed in another four weeks time between middle June and middle July, 2003. |
|
Project Title: |
BioPassVent - a theory of enclosure ventilation for purging combined pollutants |
|
Investigator(s): |
Li Y |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
09/2006 |
|
Abstract: |
|
1. Study particle deposition and bacterial survival on surfaces 2. Study of the removal of combined pollutants in simple systems 3. New ventilation strategies for removing combined pollutants 4. BioPassVent air distribution strategy for isolation rooms |
|
List of Research Outputs |
|
Li
Y., Ching
W.H., Qian H., Yuen P.L., Seto W.H., Kwan J.K., Leung J.K.C., Leung M.K.H. and Yu S.C.T., An
evaluation of the ventilation performance of new SARS isolation wards in nine
hospitals in |
|
Li Y., Building Ventilation Rates and Health, International Conference on Environment and Health Conference, Hong Kong, 6 - 8 December 2007.. 2007. |
|
Li
Y., Chapter 1: Airflow, heat and mass
transfer in enclosures, In: Hazim B Awbi, Ventilation systems - Design and
Performance. |
|
Li
Y., Zhuang
Z., Yang X. and Chen B., Chinese kang. , Presented in the 6th
International Indoor Air Quality, Ventilation and Energy Conservation in
Buildings Conference (IAQVEC 2007), |
|
Li
Y., Current R&D and Policy of Indoor
Environments in Hong Kong, 1st Asian Forum “Current R&D and Policy in
Indoor Environments in Asian Countries”, |
|
Li
Y., Leung
M.K.H., Seto W.H., Yuen P.L., Leung J.K.C., Kwan J.K. and Yu S.C.T.,
Factors affecting ventilation effectiveness in SARS wards, Hong Kong
Medical Journal. |
|
Li
Y., NSFC Outstanding Young Researcher Award, Natural
Science Foundation of |
|
Li Y., Natural Ventilation for Prevention of Airborne Transmission, International Conference on Environment and Health Conference, Hong Kong, 6 - 8 December 2007.. 2007. |
|
Li
Y., Respiratory droplets and ventilation of
buildings, |
|
Li Y., Towards an understanding of expiratory droplets and SARS ward ventilation, Health Research Symposium 2007, HK Academy of Medicine, Aberdeen, Hong Kong, 29 September 2007.. 2007. |
|
Li Y., Ventilation and Infection, 25th Annual Conference of the Australian Institute of Occupational Hygienists, 1-5 December 2007, Melbourne 3-5, December 2007. . 2007. |
|
Luo
Z. and Li Y., Predicting
natural ventilation in a two-zone building driven by combined forces. , Presented
in Building Simulation 2007, the 10th |
|
Qian H., Li Y., Nielsen P.V., Hyldgaard C.E. and Wong T.W., Dispersion of Exhalation Pollutants in a Two-Bed Hospital Ward with a Downward Ventilation System, In: Qingyan (Yan) Chen, Building and Environment. Building and Environment, Elsevier, 2008, 43: 344-354. |
|
Qian H., Li Y., Huang X., Sun H., Seto W.H. and Yuen P.L., Particle removal efficiency of a portable hepa air cleaner in a hospital ward, Presented in the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007), Sendai, October 28th - 30th, 2007.. 2007. |
|
Yang L. and Li Y., Thermal environment and airflow in a semi-enclosed space surrounded by buildings – a numerical study, Presented in the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007), Sendai, October 28th - 30th, 2007.. 2007. |
|
Zhuang
Z., Li Y. and Chen B., A
mathematical model for a house with an elevated Chinese kang heating system, Presented
in Building Simulation 2007, the 10th |
|
Researcher
: Liu CH |
|
List of Research Outputs |
|
Leung Y.C., Liu C.H., Kwok K.T. and Vrijmoed L.L.P., Study on the biogenic VOCs emissions of Hong Kong, 3rd International Symposium on Environment. Athens, Greece, Athens Institute for Education & Research, 2008, 21pp. |
|
Li
X., Liu C.H. and Leung Y.C., Large-eddy simulation of
flow and pollutant dispersion in urban street canyons of high aspect ratios, 7th
Symposium on Urban Environment. |
|
Li
X., Leung Y.C., Liu C.H. and Lam K.M., Physical modelling of flow
field inside urban street canyons, Journal of Applied Meteorology &
Climatology. |
|
Liu
C.H., Indoor Air Quality in |
|
Liu
C.H., Indoor air quality management in |
|
Liu
C.H., Investigation of air pollutant short
circuit in high-rise naturally ventilated residential buildings, 3rd
International Symposium on Environment. |
|
Liu
C.H., Large-scale paralled computing of
incompressible fluid turbulence on Linux PC clusters, Croucher Advanced
Study Insititue, Mathematical & Algorithmic Challenges for Modelling
& Analyzing Modern Data Sets. |
|
Liu C.H. and Leung Y.C., Numerical study on the ozone formation inside street canyons using a chemistry box model, Journal of Environmental Sciences. 2008, 20: 832-837. |
|
Memon
R.A., Leung Y.C. and Liu C.H., A review on the
generation, determination and mitigation of urban heat island, Journal of
Environmental Science. |
|
Xie X., Liu C.H. and Leung Y.C., Impact of building facades
and ground heating on wind flow and pollutant transport in street canyons, Atmospheric
Environment. |
|
Researcher
: Liu F |
|
List of Research Outputs |
|
Liu F. and Wang L., Chaotic oscillations of forced convection in tightly coiled ducts, Numerical Heat Transfer A. 2007, 51: 179-194. |
|
Wang L. and Liu F., Forced convection in slightly curved microchannels, International Journal of Heat and Mass Transfer. 2007, 50: 881-896. |
|
Wang L. and Liu F., Forced convection in tightly coiled ducts: bifurcation in a high Dean number region, International Journal of Non-linear Mechanics. 2007, 42: 1018-1034. |
|
Researcher
: Liu F |
|
List of Research Outputs |
|
Liu F. and Wang L., Chaotic oscillations of forced convection in tightly coiled ducts, Numerical Heat Transfer A. 2007, 51: 179-194. |
|
Wang L. and Liu F., Forced convection in slightly curved microchannels, International Journal of Heat and Mass Transfer. 2007, 50: 881-896. |
|
Wang L. and Liu F., Forced convection in tightly coiled ducts: bifurcation in a high Dean number region, International Journal of Non-linear Mechanics. 2007, 42: 1018-1034. |
|
Researcher
: Liu G |
|
List of Research Outputs |
|
Sze
K.Y. and Liu G.,
Hybrid-trefftz finite element models for plane helmholtz problems, Proceedings
of |
|
Researcher
: Liu S |
|
List of Research Outputs |
|
Liu S., Choy W.C.H., Jin L., Leung Y.P., Zheng G., wang J. and Soh A.K., Triple-crystal Zinc Selenide Nanobelts, J. Physical Chemistry C. 2007, 111: 9055-9059. |
|
Researcher
: Liu Y |
|
List of Research Outputs |
|
Liu Y.
and Wang M., Dynamic mechanical
behaviour of b-tricalcium phosphate reinforced
poly(hydroxybutyrate-co-hydroxyvalerate), Proceedings of the 8th World
Biomaterials Congress. |
|
Liu Y.
and Wang M., Fabrication and
characteristics of hydroxyapatite reinforced polypropylene as a bone analogue
biomaterial, Journal of Applied Polymer Science. |
|
Liu Y.
and Wang M., Flexural properties and
failure behavior of TCP/PHB biocomposite, Proceedings of the 8th World
Biomaterials Congress. |
|
Liu Y.
and Wang M., Thermal analysis and
crystallinity study of bioresorbable polymer composites containing
particulate b-TCP, Proceedings of the 8th World Biomaterials Congress. |
|
Researcher
: Luo Z |
|
List of Research Outputs |
|
Luo Z.
and Li Y., Predicting natural
ventilation in a two-zone building driven by combined forces. , Presented
in Building Simulation 2007, the 10th |
|
Researcher
: Ma X |
|
List of Research Outputs |
|
Huang J., Ma X. and Huang L., Experimental study and control of noise from a window-type ventilation fan, The 3rd International Fan Noise Symposium (Fan Noise 2007, 17-19 September, Lyon, France). 2007, 9 pages (paper 43). |
|
Researcher
: Malomed BA |
|
List of Research Outputs |
|
Chow K.W., Merhasin I.M., Malomed B.A., Nakkeeran K., Senthilnathan K. and Wai P.K.A., Periodic waves in fiber Bragg gratings, Physical Review E. 2008, 77: 026602 (8 pages). |
|
Chow K.W., Lam C.K., Nakkeeran K. and Malomed B.A., Transmission and stability of solitary pulses in complex Ginzburg – Landau equations with variable coefficients, Journal of the Physical Society of Japan. 2008, 77: 054001 (5 pages). |
|
Chow K.W. and Malomed B.A., Transmission of solitary pulses in nonlinear inhomogeneous media, SPIE (International Society of Optical Engineering/Society of Photonics and Instrumentation Engineers) Proceedings. 2007, 6785: 67850X (6 pages). |
|
Merhasin I.M., Malomed B.A., Senthilnathan K., Nakkeeran K., Wai P.K.A. and Chow K.W., Solitons in Bragg gratings with saturable nonlinearities, Journal of the Optical Society of America B. 2007, 24: 1458-1468. |
|
Researcher
: Memon RA |
|
List of Research Outputs |
|
Memon R.A., Leung Y.C. and Liu C.H., A review on the generation,
determination and mitigation of urban heat island, Journal of
Environmental Science. |
|
Researcher
: Mok HT |
|
List of Research Outputs |
|
Mok H.T., Online fault detection and isolation of nonlinear systems based
on neurofuzzy networks, Ph. D. Thesis. Hong Kong, The |
|
Researcher
: Mou S |
|
List of Research Outputs |
|
Mou S., Gao H., Lam J. and Qiang W., A new criterion of delay-dependent asymptotic stability for hopfield neural networks with time delay, IEEE Transactions on Neural Networks. IEEE, 2008, 19(3): 532-535. |
|
Researcher
: Muley AA |
|
List of Research Outputs |
|
Muley A.A., Synthesis and characterization of nanostructured metallic zinc
and zinc oxide, M.Phil. Thesis. Hong Kong, The |
|
Project Title: |
Dispersion of a chemical species subject to sorptive exchange in a wave boundary layer |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
09/2002 |
|
Abstract: |
|
The goal of the study is to study theoretically the transport of a sorbing chemical species in a wave boundary layer on the bottom of a body of water, where the transport is subject to the effects of kinetic mass exchange between an aqueous phase and a sorbed phase on suspended particles. The project also aims at constructing a mathematical model to describe these transport processes. |
|
Project Title: |
Nonlinear interaction between surface gravity waves and non-Newtonian fluid mud |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
12/2003 |
|
Abstract: |
|
To study: (i) characterization of
cohesive sediments in estuaries of |
|
Project Title: |
On the Control of Electroconvection in the Manufacture of Smart Materials Free From Impurities |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
01/2005 |
|
Abstract: |
|
Purpose:- This project is to conduct a theoretical study on the control of electroconvection in a layer of fluid-saturated porous medium in the presence of a transverse temperature gradient and electric field, with a view of proposing efficient mechanisms to suppress electroconvective instability in the manufacture of smart materials free from impurities. Practical Issues:- Materials science processing applications require manufacture of new strong materials, like nano and smart materials, free from impurities. Smart materials are those that have both sensing and actuating properties. One of the most crucial and active areas of research in this direction is the solidification of different types of alloys, which may be dielectric or poorly electrically conducting, by cooling from below and heating from above. At present, ferroelectric (i.e., dielectric) ceramics have been widely used in making smart devices by virtue of their piezoelectric properties. Although much less studied, smart materials can also be manufactured from poorly electrically conducting alloys (like shape memory alloys made of nickel-titanium, aluminum oxides, electrochromic, particle reinforced aluminum matrix composites, self-assembled materials and so on), which have a small electrical conductivity. These smart and strong materials have built-in sensing, actuation and control features, which can be effectively used in the design of all types of structures having a high level of safety, reduced vibration and noise, high shape control with accompanying pay-off. Problems Addressed:- These smart materials are synthesized by solidifying poorly conducting alloys by cooling from below and heating from above. In this material science process, the physical process is as follows. The variation of electrical conductivity due to the temperature difference induces free charges in the bulk of the fluid. These free charges interacting with an induced, and/or applied electrical field will produce a force equal to the product of the charge and the strength of the electric field. This force may lead to a kind of convective instability called electroconvection, which in turn produces a mushy layer that is a solid-fluid mixture made up of dendrites. These dendrites produced by electroconvection are regarded as impurities. The problem here is therefore to propose mechanisms to suppress electroconvection in order to reduce the formation of dendrites in the manufacture of smart and strong materials, which are intended to be free from impurities. |
|
Project Title: |
Dispersion mechanisms in biomechanics of synovial joints and coronary artery diseases |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2005 |
|
Abstract: |
|
To look into the transport phenomena in a synovial joint and in the coronary arteries in a human body, in connection with the associated diseases in these organs and the synthesis of artificial materials for the replacement of these human body parts; to investigate the problem in detail incorporating the concepts and requirements of a smart material based on various models for the dispersion mechanism and fluid rheology. |
|
Project Title: |
A Model for Mass Transport in Oscillatory Flow through a Curved Tube with Viscoelastic Absorbing Wall |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
01/2007 |
|
Abstract: |
|
This project aims to develop a model for
the mass transport associated with flow through a tube, when subject to the
combination of the following effects: i) the flow is oscillatory; ii) the
tube is curved; iii) the tube wall is made of viscoelastic and reactive
material; iv) the fluid can be non-Newtonian; and v) it is during an early
phase of the dispersion process. Dispersion is a mechanism that enhances the
rate of broadening of a solute cloud in flow through a tube of channel, and
can therefore be utilized as an effective means to accomplish dilution or
mixing. It plays a central role in applications and processes as diverse as
chromatographic separations in chemical engineering, the mixing and transport
of drugs or toxins in physiological flows related to cardiovascular and
respiratory systems, and contaminant transport in surface and subsurface
waters, and so on. Dispersion is an interaction between lateral diffusion and
velocity shear, and is therefore a function of the flow type, the geometry of
the channel, and also properties of the substance. Other factors, like flow
pulsation, chemical reactions, and boundary irregularities may also affect
the dispersion. Despite the sizable literature on dispersion, the existing
works are largely limited by the following aspects. First, many dispersion
models are valid only for large times after injection, and hence applicable
only to sufficiently long tubes/channels. Many systems, like blood
circulation, involve short tubes, and it is important to understand the early
development of dispersion in such systems. Second, many of the individual
factors of dispersion have only been studied either separately or together
with only a few others. The combined effects, when many of the factors are
equally important at the same time, remain largely unknown. It is because the
coupling of effects may lead to results that can be dramatically different
from the sum of the individual effects. Moreover, many studies on dispersion
have only presented mathematical formalism rather than tools for immediate
practical use. In view of these issues, it is worth pursuing a study with the
following intentions. (1) To perform a thorough review of the literature,
since the classical work due to |
|
List of Research Outputs |
|
Lau
M.W. and Ng C.O., On the
early development of dispersion in flow through a tube with wall reactions, Proceedings
of |
|
Lau
M.W. and Ng C.O., On the
early development of dispersion in flow through a tube with wall reactions, Proceedings
of the Fifth International Conference on Fluid Mechanics, |
|
Ng
C.O. and Wu C.H., Dispersion of suspended
particles in a wave boundary layer over a viscoelastic bed, International
Journal of Engineering Science. |
|
Ng
C.O. and Wu
C.H., Dispersion of suspended particles in a wave boundary layer, Proceedings
of the Seventeenth (2007) International Offshore and Polar Engineering
Conference, Lisbon, Portugal, July 1–6. |
|
Ng
C.O., Editorial Advisory Board Member, since
December 2007, The |
|
Ng C.O., Editorial Advisory Board Member, since October 2007, The Open Oceanography Journal. Bentham Science Publishers, 2007. |
|
Ng
C.O., Invited (international) Editorial Board
Committee Member, since August 2003, Journal of Hydrodynamics. |
|
Ng
C.O., Member of the Editorial Board, since
July 2006, Engineering Applications of Computational Fluid
Mechanics. Hong Kong, The |
|
Ng
C.O., William Mong Visiting Research
Fellowship to sponsor an incoming visit in May, 2008, by Prof. C.Y. Wang of |
|
Shen Y.M., Zheng Y.H. and Ng C.O., Interaction of oblique
waves with an array of long horizontal circular cylinders, Science in
China: Series E Technological Sciences. |
|
Sivasankaran S., Kandaswamy P. and Ng C.O., Double diffusive convection
of anomalous density fluids in a porous cavity, Transport in Porous Media.
|
|
Yang
J., Ng C.O. and Zhang D., Numerical study of water waves
generated by a submerged moving body in a two-layer fluid system, Proceedings
of EM08, Inaugural International Conference of the Engineering Mechanics
Institute, Minneapolis, Minnesota, USA, May 18–21. |
|
Zheng Y.H., Shen Y.M. and Ng C.O., Effective boundary element method for the interaction of oblique waves with long prismatic structures in water of finite depth, Ocean Engineering. Oxford, UK, Elsevier Science Ltd., 2008, 35(5-6): 494–502. |
|
List of Research Outputs |
|
Ng K.S.
and Ngan A.H.W., A monte carlo model
for the intermittent plasticity of micro-pillars, Modelling and Simulation
in Materials Science and Engineering. |
|
Ng K.S. and Ngan A.H.W., Creep of micron-sized aluminium columns, Philosophical Magazine Letters. Taylor & Francis, 2007, 87(12): 967-977. |
|
Ng K.S. and Ngan A.H.W., Stochastic nature of plasticity of aluminum micro-pillars, Acta Materialia. Elsevier Ltd., 2008, 56: 1712-1720. |
|
Ng K.S. and Ngan A.H.W., Stochastic theory for jerky deformation in small crystal volumes with pre-existing dislocations, Philosophical Magazine. Taylor & Francis, 2008, 88(5): 677-688. |
|
Ngan A.H.W. and Ng K.S., Intermittent Plasticity of Micron-sized Crystals, In: A.S. Khan and B. Farrokh, Keynote Paper, The 14th International Symposium on Plasticity and Its Current Applications (Plasticity 2008), January 3-8, 2008, Hawaii, USA. 2008. |
|
Ngan
A.H.W. and Ng K.S.,
Intermittent Plasticity of Small |
|
Researcher
: Ngan AHW |
|
Project Title: |
Stress-exponent measurement of nano-grained thin-films by nanoindentation |
|
Investigator(s): |
Ngan AHW |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
09/2002 |
|
Abstract: |
|
The project attempts to investigate the deformation mechanism of nanograined thin film by measuring the stress exponent using depth-sensing indentation and by comparing with theoretical predictions. It is proposed to systematically vary the grain-size-to-indent-size ratio to investigate its effect on the measured properties. |
|
Project Title: |
Creep effects in high-temperature nanoindentation |
|
Investigator(s): |
Ngan AHW |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
09/2004 |
|
Abstract: |
|
To investigate the characteristics of sub-micron indentation creep at room temperature, by using different materials with a variety of melting points; particular attention will be paid to the dependence of creep characteristics in a representative range of materials on melting temperature and indent size (or load); the effects of creep on elastic modulus and hardness measurements by the well-known Oliver-Pharr method will also be investigated. |
|
Project Title: |
Proposal on Seed Funding for Strategic Research Theme on Bio-nanotechnology |
|
Investigator(s): |
Ngan AHW, Che CM, Wong WT, Lu WW, Sze KY, Chan BP |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding for Strategic Research Theme |
|
Start Date: |
05/2005 |
|
Abstract: |
|
To encourage staff to collaborate on the research theme by working and securing external research grants; to increase the visibility of HKU in the relevant research areas in the world scene. |
|
Project Title: |
Effects of Surface Adhesion on Mechanical Property Measurement of Viscoelastic Materials by Nanoindentation |
|
Investigator(s): |
Ngan AHW |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
09/2005 |
|
Abstract: |
|
The main objectives of this project are: (1) To study how tip-sample adhesion affects the nanoindentation response of materials, and (2) To develop procedures to measure the elastic modulus and hardness of materials by nanoindentation when significant tip-sample adhesion is present. |
|
Project Title: |
Statistical distribution, size and time dependence of initial yield strength in submicron crystals |
|
Investigator(s): |
Ngan AHW |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
09/2006 |
|
Abstract: |
|
1 (Objective 1) To investigate the mechanism for the rapid increase of the initial yield strength of annealed crystals as size decreases in the micron to submicron regime. 2 (Objective 2) To investigate the nature and mechanism of the statistical scatter of the initial yield strength data in the micron to submicron regime. 3 (Objective 3) To study the time dependence of the initial yield strength in the micron to submicron regime. |
|
Project Title: |
Length-scale effects of mechanical properties of cortical bone |
|
Investigator(s): |
Ngan AHW |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
02/2007 |
|
Abstract: |
|
Currently, nanoindentation is widely used in biological research because it can measure the mechanical properties of materials from specified small material volumes. Biological tissues are challenging materials for nanoindentation because their structure is hierarchical down to the nanometer length scale, so that their properties should be strong functions of the material volume size from which the measurements are taken. Unfortunately, the effects of the maximum load or indent size on the measured properties of these materials are seldom rigorously considered in the literature. The PI has performed a preliminary but systematic study using goat femur samples as a prototype cortical bone material. Nanoindentation tests were conducted with a sharp diamond indenter in these cortical bone samples using a step-wise increasing load schedule shown in Fig. 1. This multi-cycle load schedule allowed the mechanical properties to be measured as a function of load or indent size on a specific sub-micron location in the bone sample, thus eliminating the effects of location-dependent inhomogeneity of the sample on the measured properties if different tests are carried out in different locations. The peak loads of the cycles in Fig. 1 ranged from 0.5 to 300 mN, resulting in indents 90nm to 4.2 microns deep. Fig. 2 shows the elastic modulus and hardness calculated from each cycle at 3 independent locations of the same bone sample. It can be seen that the elastic modulus at all three positions measured drops significantly from about 38 GPa at 90 nm indent depth to about 21 GPa at 4169 nm, and the hardness drops from 2.5 GPa to 0.9 GPa over same depth range. The properties measured at smaller indent depths show larger scatter. The saturating values of the measured properties at large indent depths in Fig. 2 are similar to values reported in the literature for cortical bone of large mammals, but the sharp increments at small indent depths are novel results unseen before in the literature. In a nanoindentation experiment, the size of the material volume probed is proportional to the indent depth, and so it is believed that the significant rise in the measured properties at small indent sizes is due to the hierarchical structure of cortical bone at the sub-micron level. Similar, although less systematic, results were also found in cortical bone samples from two strains of mice. However, control experiments on monolithic, amorphous materials such as polymers or fused quartz did not reveal any size dependence on the measured properties, as expected. The strong size dependence of mechanical properties is thus believed to be generic amongst bone of different species. Objectives – The present project aims at studying the size effect of mechanical properties as measured from nanoindentation tests in animals of different sizes, including goats, rabbits, mice, etc., to observe any generic trend amongst different animal species. |
|
List of Research Outputs |
|
Aifantis K.E. and Ngan A.H.W., Modeling dislocation - grain boundary interactions through gradient plasticity and nanoindentation, Materials Science and Engineering A. Elsevier B.V., 2007, 459: 251-261. |
|
Aladin Kaderbatcha D.M., Lu W.W., Cheung K.M.C., Ngan A.H.W., Chan D. and Luk K.D.K., Association of Trp2 allele with changes in morphology and nano mechanics of the human intervertebral disc collagens, Best Basic Science Paper Award for Associate Member, 27th Annual Congress of the Hong Kong Orthopaedic Association, Hong Kong, November 17-18, 2007. 2007. |
|
Chan B.P., Li C.H., Au-yeung K.L., Sze K.Y. and Ngan A.H.W., A microplate compression method for elastic modulus measurement of soft and viscoelastic collagen microspheres, Annals of Biomedical Engineering. Biomedical Engineering Society, 2008, 36(7): 1254-1267. |
|
Chan
Y.L., Wu S.L., Liu X.M., |
|
Ip W.Y., Chow S.P., Lam K.W., Gibson I., Ngan A.H.W., Lu W. and Chiu P.K.Y., A Novel Artificial Prosthetic Replacement For The Proximal Interphalangeal Joint Of The Hand - From Concept To Prototype, Australian Orthopaedic Association Continuing Orthopaedic Education Meeting . 2008. |
|
Li
C.H., Ngan A.H.W., Sze K.Y. and Chan B.P., Microplate manipulation of
human mesenchymal stem cells (hMSCs) - collagen microspheres, World Forum
for Spine Research the Intervertebral Disc. |
|
Li Z., Lu W.W., Chiu P.K.Y., Lam R.W.M., Tang B., Ngan A.H.W., Wong C.T., Fang D., Cheung K.M.C. and Luk K.D.K., Micro-architectural and nano-mechanical properties of trabecular bone with strontium treatment in large animal model of osteoporosis, 27th Annual Congress of the Hong Kong Orthopaedic Association, Hong Kong, November 17-18, 2007. |
|
Li Z., Lu W.W., Chiu P.K.Y., Lam R.W.M., Cheung K.M.C., Tang B., Ngan A.H.W. and Luk K.D.K., Micro-architecture and Nano-mechanics of Lumbar Vertebra with Strontium Treatment in Large Animal Model of Osteoporosis, 54th Annual Meeting of the Orthopaedic Research Society, San Francisco, USA. 2008, P276. |
|
Ng
K.S. and Ngan A.H.W., A
monte carlo model for the intermittent plasticity of micro-pillars, Modelling
and Simulation in Materials Science and Engineering. |
|
Ng K.S. and Ngan A.H.W., Creep of micron-sized aluminium columns, Philosophical Magazine Letters. Taylor & Francis, 2007, 87(12): 967-977. |
|
Ng K.S. and Ngan A.H.W., Stochastic nature of plasticity of aluminum micro-pillars, Acta Materialia. Elsevier Ltd., 2008, 56: 1712-1720. |
|
Ng K.S. and Ngan A.H.W., Stochastic theory for jerky deformation in small crystal volumes with pre-existing dislocations, Philosophical Magazine. Taylor & Francis, 2008, 88(5): 677-688. |
|
Ngan A.H.W., Editorial, International Journal of Surface Science and Engineering, Special Issue on Characterization of Surface Properties by Nanoindentation Techniques. Inderscience Enterprises Ltd., 2007, 1(2/3): 155. |
|
Ngan A.H.W. and Ng K.S., Intermittent Plasticity of Micron-sized Crystals, In: A.S. Khan and B. Farrokh, Keynote Paper, The 14th International Symposium on Plasticity and Its Current Applications (Plasticity 2008), January 3-8, 2008, Hawaii, USA. 2008. |
|
Ngan
A.H.W. and Ng K.S., Intermittent Plasticity of
Small |
|
Ngan
A.H.W., Outstanding Researcher Award,
2006-2007, |
|
Ngan A.H.W., Outstanding Reviewer Award, Scripta Materialia. 2008. |
|
Ni G.X., Lu W.W., Tang B., Ngan A.H.W., Chiu K.Y., Cheung K.M.C., Li Z. and Luk K.D.K., Effect Of Weight-bearing On
Bone-bonding Behavior Of Strontium-containing Hydroxyapatite Bone Cement, Journal
Of Biomedical Materials Research Part A. 111 RIVER ST, HOBOKEN, NJ 07030
USA, WILEY-LISS, DIV JOHN WILEY & SONS INC, 2007, |
|
Smallman R.E. and Ngan A.H.W., Physical Metallurgy and Advanced Materials. Elsevier, 2007, 672. |
|
Tang B. and Ngan A.H.W., Critical Issues In Mechanical Characterization Of Biological Tissues Using Nanoindentation, 1st International Conference From Nanoparticles&nanomaterials To Nanodevices&nanosystems. 2008, 336. |
|
Tang B. and Ngan A.H.W., Nanoindentation measurement of mechanical properties of soft solid covered by a thin liquid film, Soft Materials. Taylor & Francis, 2007, 5(4): 169-181. |
|
Xu Z. and Ngan A.H.W., Indentation-induced crystallisation in amorphous silicon thin films, International Journal of Surface Science and Engineering. Inderscience Enterprises Ltd., 2007, 1(2/3): 308-321. |
|
Researcher
: Ni M |
|
List of Research Outputs |
|
Leung
M.K.H., Ni M. and Leung Y.C., Theoretical models for
design optimization of hydrogen fuel cells and electrolyzers, In:
International Association for Hydrogen Energy and Australian Institute of
Energy, 17th World Hydrogen Energy Conference, |
|
Leung Y.C., Leung M.K.H. and Ni M., A review of the photocatalytic degradation of volatile orgainc compounds (VOCs) in indoor air, The Catalyst Review. Bethlehem Pike, USA, Catayst Group, 2008, April issue: 5-13. |
|
Ni M., Leung Y.C. and Leung M.K.H., A review on reforming bio-ethanol for hydrogen-rich gas production, International Journal of Hydrogen Energy. 2007, 32: 3238-3247. |
|
Ni M., Leung M.K.H. and Leung Y.C., Energy and exergy analysis of hydrogen production by solid oxide steam electrolyzer plant, International Journal of Hydrogen Energy. 2007, 32: 4648-4660. |
|
Ni
M., Invited as a keynote speaker for The
Second National Conference on Hydrogen Energy and |
|
Ni M., Leung M.K.H. and Leung Y.C., Mathematical modeling of proton-conducting solid oxide fuel cells and comparison with oxygen-ion-conducting counterpart, Fuel Cells. 2007, 7: 269-278. |
|
Ni M.,
Mathematical modeling of solid oxide steam electrolyzer for hydrogen
production, Ph.D. Thesis. Hong Kong, The |
|
Ni M., Leung M.K.H. and Leung Y.C., Mathematical modeling of the coupled transport and electrochemical reactions in solid oxide steam electrolyzer for hydrogen production, Electrochimica Acta. 2007, 52: 6707-6718. |
|
Ni M., Leung M.K.H. and Leung Y.C., Parametric study of solid oxide steam electrolysis for hydrogen production, International Journal of Hydrogen Energy . 2007, 32: 2305-2313. |
|
Ni M., Leung M.K.H. and Leung Y.C., Study on gas transfer within solid oxide fuel cell cathode, Chinese Journal of Power Sources. 2007, 31: 777-778. |
|
Ni M., Leung M.K.H. and Leung Y.C., Technological developments in hydrogen production by solid oxide steam electrolyzer, International Journal of Hydrogen Energy . 2008, 33: 2337-2354. |
|
Ni M., Leung M.K.H. and Leung Y.C., Theoretical analysis of reversible solid oxide fuel cell based on proton-conducting electrolyte, Journal of Power Sources . 2008, 177: 369-375. |
|
Ni M., Leung M.K.H. and Leung Y.C., Theoretical modeling of the electrode thickness effect on maximum power point of dye-sensitized solar cell, Canadian Journal of Chemical Engineering. 2008, 86: 35-42. |
|
Ni M., Young Scientist Award, Hong Kong Institute of Science. 2007. |
|
Researcher
: Ni M |
|
List of Research Outputs |
|
Leung
M.K.H., Ni M. and Leung Y.C., Theoretical models for
design optimization of hydrogen fuel cells and electrolyzers, In:
International Association for Hydrogen Energy and Australian Institute of
Energy, 17th World Hydrogen Energy Conference, |
|
Leung Y.C., Leung M.K.H. and Ni M., A review of the photocatalytic degradation of volatile orgainc compounds (VOCs) in indoor air, The Catalyst Review. Bethlehem Pike, USA, Catayst Group, 2008, April issue: 5-13. |
|
Ni M., Leung Y.C. and Leung M.K.H., A review on reforming bio-ethanol for hydrogen-rich gas production, International Journal of Hydrogen Energy. 2007, 32: 3238-3247. |
|
Ni M., Leung M.K.H. and Leung Y.C., Energy and exergy analysis of hydrogen production by solid oxide steam electrolyzer plant, International Journal of Hydrogen Energy. 2007, 32: 4648-4660. |
|
Ni
M., Invited as a keynote speaker for The
Second National Conference on Hydrogen Energy and |
|
Ni M., Leung M.K.H. and Leung Y.C., Mathematical modeling of proton-conducting solid oxide fuel cells and comparison with oxygen-ion-conducting counterpart, Fuel Cells. 2007, 7: 269-278. |
|
Ni M.,
Mathematical modeling of solid oxide steam electrolyzer for hydrogen
production, Ph.D. Thesis. Hong Kong, The |
|
Ni M., Leung M.K.H. and Leung Y.C., Mathematical modeling of the coupled transport and electrochemical reactions in solid oxide steam electrolyzer for hydrogen production, Electrochimica Acta. 2007, 52: 6707-6718. |
|
Ni M., Leung M.K.H. and Leung Y.C., Parametric study of solid oxide steam electrolysis for hydrogen production, International Journal of Hydrogen Energy . 2007, 32: 2305-2313. |
|
Ni M., Leung M.K.H. and Leung Y.C., Study on gas transfer within solid oxide fuel cell cathode, Chinese Journal of Power Sources. 2007, 31: 777-778. |
|
Ni M., Leung M.K.H. and Leung Y.C., Technological developments in hydrogen production by solid oxide steam electrolyzer, International Journal of Hydrogen Energy . 2008, 33: 2337-2354. |
|
Ni M., Leung M.K.H. and Leung Y.C., Theoretical analysis of reversible solid oxide fuel cell based on proton-conducting electrolyte, Journal of Power Sources . 2008, 177: 369-375. |
|
Ni M., Leung M.K.H. and Leung Y.C., Theoretical modeling of the electrode thickness effect on maximum power point of dye-sensitized solar cell, Canadian Journal of Chemical Engineering. 2008, 86: 35-42. |
|
Ni M., Young Scientist Award, Hong Kong Institute of Science. 2007. |
|
Researcher
: Niu C |
|
List of Research Outputs |
|
Niu C.,
A study of tool life and machinability parameters in high speed milling of
hardened die steels, M.Phil. Thesis. Hong Kong, The |
|
Researcher
: Qian H |
|
List of Research Outputs |
|
Li Y.,
Ching W.H., Qian H., Yuen P.L., Seto W.H., Kwan J.K., Leung J.K.C., Leung M.K.H. and Yu S.C.T., An
evaluation of the ventilation performance of new SARS isolation wards in nine
hospitals in |
|
Qian H., Li Y., Nielsen P.V., Hyldgaard C.E. and Wong T.W., Dispersion of Exhalation Pollutants in a Two-Bed Hospital Ward with a Downward Ventilation System, In: Qingyan (Yan) Chen, Building and Environment. Building and Environment, Elsevier, 2008, 43: 344-354. |
|
Qian H., Li Y., Huang X., Sun H., Seto W.H. and Yuen P.L., Particle removal efficiency of a portable hepa air cleaner in a hospital ward, Presented in the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007), Sendai, October 28th - 30th, 2007.. 2007. |
|
Qian H.,
Ventilation for controlling airborne infection in hospital environments, Ph.D.
Thesis. Hong Kong, The |
|
Researcher
: Qian H |
|
List of Research Outputs |
|
Li Y.,
Ching W.H., Qian H., Yuen P.L., Seto W.H., Kwan J.K., Leung J.K.C., Leung M.K.H. and Yu S.C.T., An
evaluation of the ventilation performance of new SARS isolation wards in nine
hospitals in |
|
Qian H., Li Y., Nielsen P.V., Hyldgaard C.E. and Wong T.W., Dispersion of Exhalation Pollutants in a Two-Bed Hospital Ward with a Downward Ventilation System, In: Qingyan (Yan) Chen, Building and Environment. Building and Environment, Elsevier, 2008, 43: 344-354. |
|
Qian H., Li Y., Huang X., Sun H., Seto W.H. and Yuen P.L., Particle removal efficiency of a portable hepa air cleaner in a hospital ward, Presented in the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007), Sendai, October 28th - 30th, 2007.. 2007. |
|
Qian H.,
Ventilation for controlling airborne infection in hospital environments, Ph.D.
Thesis. Hong Kong, The |
|
List of Research Outputs |
|
Rogers C.W., Chow K.W. and Conte R.M.J., On a capillarity model and the Davey – Stewartson I system: Quasi-doubly periodic wave patterns, Nuovo Cimento B. 2007, 122: 105 - 111. |
|
Rogers C.W., Schief W.K. and Chow K.W., On a novel class of model constitutive laws in nonlinear elasticity (Proceedings in Nonlinear Physics, Theory and Experiments), Theoretical Physics (Special Issue). 2007, 152: 1030 - 1042. |
|
Researcher
: Shek CM |
|
List of Research Outputs |
|
Shek C.M. and Chow K.W., The discrete modified Korteweg – de Vries equation with non–vanishing boundary conditions: Interactions of solitons, Chaos, Solitons and Fractals. 2008, 36: 296 - 302. |
|
Researcher
: Shu Z |
|
List of Research Outputs |
|
Feng J., Lam J., Xu S. and Shu Z., Optimal stabilizing controllers for linear discrete-time stochastic systems, Optimal Control Applications and Methods. 2008, 29(3): 243-253. |
|
Feng J., Lam J., Xu S. and Shu Z., Stabilization of stochastic systems with optimal decay rate, IET Journal of Control and Applications. 2008, 2(1): 1-6. |
|
Project Title: |
Toughening of ferroelectric ceramic nano-composites |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
10/2002 |
|
Abstract: |
|
This project attempts to: 1) carry out experimental and theoretical studies on deformation and fracture of ferroelectric ceramic nano-composites (FNC); 2) examine different toughening mechanisms and develop models which are able to describe such mechanisms; and 3) investigate two types of FNC, one consisting of metal nano-particles and the other of dielectric ceramic nano-particles. |
|
Project Title: |
Mechanics of ultra-thin films and nanolaminates |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
10/2003 |
|
Abstract: |
|
To develop modeling and simulation methods for prediction of the nanoscale mechanical properties of ultra-thin films and multilayer nanolaminates: to set-up innovative experiments ofr validation of these methods. |
|
Project Title: |
Thermo-elastic behavior and properties of micro- and nano-oscillators |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2005 |
|
Abstract: |
|
To develop of analytical methodologies to study the thermo-elastic behavior and properties of two typical micro-/nano-structures, i.e. micro-oscillators and nano-beam oscillators, by considering both the time-and size-scale effects; to investigate the ab-initio molecular dynamics (MD) simulation, which would include both the wave effects and internal scattering, will be carried out to study the thermo-elastic behavior and properties of the above-mentioned micro-/nano-structures; a series of experiments will be designed and carried out to provide data for comparison with the corresponding analytical and numerical results. |
|
Project Title: |
Modeling and Analysis of the Electromagnetic Behavior of Left-handed Materials |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
03/2006 |
|
Abstract: |
|
Veselago[1] coined the term “left-handed
materials (LHMs)” to categorize materials with simultaneously negative
permittivity and permeability. Such materials have significantly different
properties compared with the traditional materials in terms of transmission
of electromagnetic wave (EM wave), which may lead to significant change of
techniques that employ the principles of EM wave transmission. LHMs are
expected to play an important role in communication, radar technique and
wireless transmission. Veselago[1] predicted that many special properties,
such as Doppler shift and Snell’s law, will be reversed in the case of LHMs.
By employing an analytical model, Pendry et al.[2, 3] predicted that periodic
structures of thin wires array might have negative effective permittivity,
ε(eff) , in the GHz band. A rapid increase of interest in LHMs commenced
after Pendry et al.[4] has predicted that structures of periodically arranged
split ring resonators (SRRs) could possess, in a given frequency interval, a
negative effective magnetic permeability. Pendry[5] has also predicted that
“perfect lens” made of left-handed materials can breach the image sharpness
limitation of the traditional lens. Smith et al.[6] carried out experimental
fabrication of LHMs by combining a periodic array of interspaced conducting
nonmagnetic SRRs and continuous wires. Smith et al.’s structure is
left-handed only when the magnetic field of the incident EM wave is parallel
to the SRR axis and the electric field parallel to the wires. Shelby et
al.[7] removed anisotropy in the plane of incident by making each unit cell
to contain six copper SRRs and two wire strips on two perpendicular thin
fiberglass boards. Shelby et al.[8] were the first to observe the negative
effective index of refraction (n) by measuring the scattering angle of the
transmitted beam through a prism fabricated from a LHM. Markoš and
Soukoulis[9] studied the relations between resonance frequency and structural
parameters numerically using the transfer-matrix method (TMM). Some other
researchers used commercial softwares, such as Microwave Studio[10], to
estimate the position of the resonance frequency interval. Time-dependent
analyses using various forms of finite difference time domain (FDTD)
algorithms have also been carried out to study wave propagation in LHMs[11].
Smith et al.[12] analyzed the reflection and transmission coefficients
calculated from transfer-matrix simulations to determine the negative
effective permittivity and permeability, i.e., ε(eff ) and μ(eff) , of LHMs.
Some researchers have predicted that other structures could also form LHMs,
such as the Ω-like patterns[13, 14]. Huangfu et al.[15] reported both
transmission and prism experiments on a one-dimensional metamaterial, which
was realized using three connected Ω rings printed back-to-back and reversed
on two sides of a dielectric substrate, and confirmed that such material was
left-handed. Chui and Hu[16] showed, by adopting the approach of effective
medium approximation, that by incorporating metallic magnetic nanoparticles
into an appropriate insulating matrix and controlling the directions of
magnetization of metallic magnetic components and their volume fraction, it
might be possible to produce LHMs. By performing numerical simulations,
Podolskiy et al.[17] showed that a composite of nanowires might possess a
negative refractive index and act as a LHM in the optical range of the
spectrum. To-date, only a few theoretical models[2, 4, 14, 16] have been
proposed, and most of these models were only qualitatively consistent with
experimental or numerical results. Moreover, the values of ε(eff) and μ(eff)
are required in the entire range of frequencies, which are difficult to
determine numerically. Therefore, it is important to devise a theoretical
model, which can illustrate quantitatively the relations between the negative
effective parameters and the microstructure of LHMs. The objective of this
project is to study the microstructure of various types of LHMs. The works to
be carried out include, among other things, theoretical modeling and
numerical simulation, which are for studying the relations between the
negative effective parameters and the microstructure of LHMs. In terms of
fundamental research, the proposed project aims to develop: (1) a theoretical
model to predict quantitatively the relations between the microstructure and
negative effective parameters, i.e., ε(eff) and μ(eff), of LHMs; and (2) a
software for numerical analysis of the dynamic propagation of EM wave in
nonhomogeneous materials. A comparison will then be made between the
theoretical and numerical results obtained. In terms of engineering
applications, the proposed project is a preliminary study for investigation
of the efficient methods for preparing LHMs. A method for designing the microstructure
of a LHM will be established based on the theoretical model and numerical
simulation. References: [1] Veselago, V.G., The electrodynamics of substances
with simultaneously negative values of ε and μ, Soviet Physics Uspekhi, 10,
509-514, 1968. [2] Pendry, J.B., Holden, A.J. and Stewart, W.J., Extremely
low frequency plasmons in metallic mesostructures, Phys. Rev. Lett., 76,
4773-4776, 1996. [3] Pendry, J.B., Holden, A.J., Robbins, D.J. and Stewart,
W.J., Low frequency plasmons in thin-wire structures, J. Phys.: Condens.
Matter., 10, 4785-4809, 1998. [4] Pendry, J.B., Holden, A.J., Robbins, D.J.
and Stewart, W.J., Magnetism from conductors and enhanced nonlinear
phenomena, IEEE Transactions on Microwave Theory and Techniques, 47,
2075-2084, 1999. [5] Pendry, J.B., Negative refraction makes a perfect lens,
Phys. Rev. Lett., 85, 3966-3969, 2000. [6] Smith, D.R., Padilla, W.J., Vier,
D.C., Nemat-Nasser, S.C. and Schultz, S., Composite medium with
simultaneously negative permeability and permittivity, Phys. Rev. Lett., 84,
4184-4187, 2000. [7] Shelby, R.A., Smith, D.R., Nemat-Nasser, S.C. and
Schultz, S., Microwave transmission through a two-dimensional isotropic
left-handed metamaterial, Appl. Phys. Lett., 78, 489-491, 2001. [8] |
|
Project Title: |
Novel piezocrystals and their applications in medical ultrasonic transducers |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Small Project Funding |
|
Start Date: |
10/2006 |
|
Abstract: |
|
The objective of this proposal is not only to develop a new technique to manufacture PMNT single crystals of ultrahigh piezoelectric performance to satisfy the requirements of medical ultrasound transducers, but also to design and manufacture a prototype of high performance medical imaging transducers. The sub-objectives of this project are as follows: (1) To improve the integrated performance of PMNT single crystals by controlling the domain configuration; and to manufacture high quality large PMNT single crystals by controlling compositional variation due to segregation during crystal growth. This is to obtain the required uniform and consistent electromechanical properties for fabricating the next generation of medical ultrasonic transducers. (2) To achieve a better understanding of the influences of temperature, biased field and uniaxial stress on the performance of PMNT single crystals; and to establish an approach for optimizing the electromechanical properties of piezoelectric resonators. Hence, enhance the stability and reliability of novel medical ultrasonic transducers. (3) To design and optimize the device-structures of the next generation of medical ultrasonic transducers; and to establish a manufacturing process to fabricate wide-bandwidth and high-resolution medical imaging transducers. |
|
List of Research Outputs |
|
Chan S.H. and Soh A.K., The capillary force in micro- and nano-indentation with different indenter shapes, International Journal of Solids and Structures. UK, Pergamon-elsevier Science Ltd., 2008, 45(10): 3122-3137. |
|
Chen S.H., Xu G. and Soh A.K., Robust nanoadhesion under
torque, Tribology Letters. |
|
Chen S.H., Mi C.H. and Soh A.K., The effects of capillary
force in micro or nano-indentation, In: Fan JH; Chen HB, International
Conference on Heterogeneous Material Mechanics (ICHMM). |
|
Chen S.H. and Soh A.K., Tuning the geometrical
parameters of biomimetic fibrillar structures to enhance adhesion, Journal
of the Royal Society Interface. |
|
Chen X. and Soh A.K., Impact of combined electric response on left-handed materials, EPL. Physics, 2007, 80(3): 37006. |
|
Fang D.N., Wan W.P., Feng X. and Soh A.K., Deformation and fracture
of functional ferromagnetics, Applied Mechanics Reviews. |
|
Hong L., Soh A.K., Du Q.G. and Li J.Y., Interaction of O vacancies and domain structures in single crystal BaTiO3: Two-dimensional ferroelectric model, Physical Review B. USA, Amer Physical Soc., 2008, 77(9): 094104. |
|
Hu
R. and Soh A.K.,
Mesoscopic simulation of the properties of ferromagnetic materials, (Keynote
paper), International Conference on Computaitonal & Experimental
Engineering and Science (ICCES'08). |
|
Hu
R. and Soh A.K.,
Mesoscopic simulation of the properties of ferromagnetic materials, Proceedings
of the International Conference on Computational & Experimental
Engineering and Science (ICCES'08). |
|
Liu J.X., Zhao X. and Soh A.K., |
|
Liu S., Choy W.C.H., Jin L., Leung Y.P., Zheng G., wang J. and Soh A.K., Triple-crystal Zinc Selenide Nanobelts, J. Physical Chemistry C. 2007, 111: 9055-9059. |
|
Soh
A.K., Behaviors and properties of
ferroelectric/ferromagnetic materials, Invited Lecture held in |
|
Soh
A.K., Mesoscopic studies of
ferroelectric/ferromagnetic materials with defects, Invited Lecture held
in |
|
Soh A.K., Sun Y.X. and Fang D.N., Vibration of microscale beam induced by laser pulse, Journal of Sound and Vibration. UK, Elsevier Science Ltd., 2008, 311(1-2): 243-253. |
|
Song Y. and Soh A.K., Enhancement of mechanical and ferroelectric properties by adding Ag nano-particles to PZT matrix, Jornal of Composite Materials. UK, Sage Publications Ltd., 2008, 42(10): 947-956. |
|
Song Y., Soh A.K. and Lu L., Ferroelectric and piezoelectric behaviour of rhombohedral ferroelectric single crystal subjected to anisotropic poling, Journal of Physics D-Applied Physics. UK, IOP Publishing Ltd., 2008, 41(8): 082002. |
|
Song Y., Hu R. and Soh A.K., Microscopic simulations of the behavior of ferroelectrics and ferromagnetics, Physica Scripta. UK, IOP Publishing Ltd., 2007, T129: 136-139. |
|
Sun Y.X., Fang D.N., Saka M. and Soh A.K., Laser-induced vibrations of micro-beams under different boundary conditions, International Journal of Solids and Structures. UK, Pergamon-elsevier Science Ltd., 2008, 45(7-8): 1993-2013. |
|
Sun Z.H., Wang X.X., Soh A.K., Wu H.A. and Wang Y.,
Bending of nanoscale structures: Inconsistency between atomistic simulation and
strain gradient elasticity solution, Computational Materials Science. |
|
Tan X. and Soh A.K., Multi-objective optimization of the sandwich panels with prismatic cores using genetic algorithms, International Journal of Solids and Structures. UK, Pergamon-Elsevier Science Ltd., 2007, 44(17): 5466-5480. |
|
Wang B., Gu Y., Guo H.C., Soh A.K. and Fang D.N., Optimal
analysis and application in the design of ultra-light truss-core structures,
In: Yang W; Geni M; Wang TJ; Zhuang Z , 7th International Conference on
Fracture and Strength of Solids. |
|
Wang Y., Fang D.N., Soh A.K. and Liu B., A molecular
mechanics approach for analyzing tensile nonlinear deformation behavior of
single-walled carbon nanotubes, Acta Mechanica Sinica. |
|
Xie Y., Kong Y., Soh A.K. and Gao H.J., Electric field-induced translocation of single-stranded DNA through a polarized carbon nanotube membrane, Journal of Chemical Physics. USA, AMER Inst. Physics, 2007, 127(22): 225101. |
|
Xie
Y., Kong Y., Gao H.J. and Soh A.K.,
Molecular dynamics simulation of polarizable carbon nanotubes, Computational
Materials Science. |
|
Yan
K. and Soh A.K., Effects
of extrinsic grain boundary defects on Kapitza resistance under laser pulse, Proceedings
of the Eighth International Conference on Fundamentals of Fracture (ICFFVIII).
|
|
Yan
K. and Soh A.K.,
Simulation of surface effects in energy dissipation of ultra-high-frequency
(UHF) nanocantilevers, Proceedings of the SPIE. |
|
Researcher
: Song Y |
|
List of Research Outputs |
|
Song Y. and Soh A.K., Enhancement of mechanical and ferroelectric properties by adding Ag nano-particles to PZT matrix, Jornal of Composite Materials. UK, Sage Publications Ltd., 2008, 42(10): 947-956. |
|
Song Y., Soh A.K. and Lu L., Ferroelectric and piezoelectric behaviour of rhombohedral ferroelectric single crystal subjected to anisotropic poling, Journal of Physics D-Applied Physics. UK, IOP Publishing Ltd., 2008, 41(8): 082002. |
|
Song Y., Hu R. and Soh A.K., Microscopic simulations of the behavior of ferroelectrics and ferromagnetics, Physica Scripta. UK, IOP Publishing Ltd., 2007, T129: 136-139. |
|
Song Y.,
The behavior and properties of ferroelectric single crystals and
ferroelectric nano-composites, Ph.D. Thesis. Hong Kong, The |
|
Researcher
: Sultana N |
|
List of Research Outputs |
|
Sultana N. and Wang M., An
investigation into water uptake of composite scaffolds and films based on
PHBV/PLLA polymer blends, Proceedings of the 8th World Biomaterials
Congress. |
|
Sultana N. and Wang M., Fabrication
of HA/PHBV composite scaffolds through the emulsion freezing / freeze-drying
process and characterisation of the scaffolds, Journal of Materials
Science: Materials in Medicine. |
|
Sultana N. and Wang M., New
composite scaffolds based on PHBV/PLLA polymer blends for bone tissue
engineering, Proceedings of the 8th World Biomaterials Congress. |
|
Sultana N. and Wang M.,
PHBV/PLLA-based composite scaffolds containing nano-sized calcium phosphate
particles for bone tissue engineering, Proceedings of the International
Conference on Materials for Advanced Technologies 2007 (ICMAT 2007). |
|
Sultana N. and Wang M., In vitro
Degradation of HA-containing and PHBV/PLLA-based composite scaffolds, Proceedings
of the 8th World Biomaterials Congress. |
|
Researcher
: Sun H |
|
List of Research Outputs |
|
Qian H., Li Y., Huang X., Sun H., Seto W.H. and Yuen P.L., Particle removal efficiency of a portable hepa air cleaner in a hospital ward, Presented in the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007), Sendai, October 28th - 30th, 2007.. 2007. |
|
Researcher
: Sun T |
|
List of Research Outputs |
|
Sun T.
and Wang M., Apatite/TiO2 composite
coatings formed on Ti, Ti-6Al-4V and NiTi shape memory alloy through a
biomimetic process, Proceedings of the 11th Annual Conference on Ceramics,
Cells and Tissues. |
|
Sun T.
and Wang M., Characteristics of the
titania layer formed on NiTi shape memory alloy through a low temperature
process, Proceedings of the 8th World Biomaterials Congress. |
|
Sun T.
and Wang M., Chemical stability of
the titania layer formed synthetically on NiTi shape memory alloy as a
barrier to prevent nickel Ion release, Proceedings of the 5th
International Conference on Information Technology and Applications in
Biomedicine (ITAB 2008). |
|
Sun T.
and Wang M., Low-temperature
biomimetic fabrication and characterization of Apatite/TiO2 composite coating
on Ti, Ti-6Al-4V and NiTi shape memory alloy, Proceedings of the 1st
International Symposium on Surface and Interface of Biomaterials. |
|
Sun T.
and Wang M., Nanoindentation and
nano-scratch studies of Apatite/TiO2 composite coating synthesized on
surfaces of Ti, Ti-6Al-4V and NiTi shape memory alloy, Proceedings of the
1st International Symposium on Surface and Interface of Biomaterials. |
|
Sun T.
and Wang M., Structure and mechanical
properties of Apatite/TiO2 composite coating synthesized on Ti-6Al-4V alloy, Proceedings
of the 8th World Biomaterials Congress. |
|
Project Title: |
Computational methods for meso-electromechanical analysis of ferroelectrics and ferroelectric devices |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2001 |
|
Abstract: |
|
To develop meso-scale constitutive and switching models of ferroelectrics suitable for finite element implementation. The project also aims to develop finite element procedure for determining the eigensolutions of the singular electromechanical fields at the boundary between ferroelectric grains with different polar directions and at electrode-ferroelectrics interfaces. |
|
Project Title: |
Development of a rotation-free computational method for fabric drape simulation |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
12/2003 |
|
Abstract: |
|
To develop an efficient computational method for simulating the mechanics responses of fabrics. Darts, folds and seams will be considered. |
|
Project Title: |
Trefftz computational method for simulating domain switching in ferroelectric materials. |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Small Project Funding |
|
Start Date: |
12/2005 |
|
Abstract: |
|
To formulate and implement a Trefftz computational method for simulating domain switching in ferroelectric materials. |
|
Project Title: |
Development of computational models for geometric nonlinear analysis of smart plate/shell structures |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Small Project Funding |
|
Start Date: |
10/2006 |
|
Abstract: |
|
Among smart structure technologies, vibration control of thin-walled and large-span light-weight structures attracts most of the research effort. Owing to the low flexural rigidity and low material damping, external load or maneuver-induced inertia force of these structures can trigger large-amplitude vibrations which take long time to decay. To minimize operational errors, structural instabilities and material fatigue, active damping has been pursued. The proposed project aims at developing robust and efficient computational models for analyses of geometrically nonlinear smart plate/shell structures. Objectives of the proposed project include: - Development of geometrically nonlinear computational models for piezoelectrics. - Development of incremental time formulation for geometric nonlinear analyses smart plate/shell structures. |
|
List of Research Outputs |
|
Chan B.P., Li C.H., Au-yeung K.L., Sze K.Y. and Ngan A.H.W., A microplate compression method for elastic modulus measurement of soft and viscoelastic collagen microspheres, Annals of Biomedical Engineering. Biomedical Engineering Society, 2008, 36(7): 1254-1267. |
|
Chen S.H., Huang J.L. and Sze K.Y., Multidimensional Lindstedt-Poincaré method for nonlinear vibration of axially moving beams, Journal of Sound and Vibration. 2007, 306: 1-11. |
|
Li
C.H., Ngan A.H.W., Sze K.Y. and Chan B.P., Microplate manipulation of
human mesenchymal stem cells (hMSCs) - collagen microspheres, World Forum
for Spine Research the Intervertebral Disc. |
|
Liu Y., Zhang X., Sze K.Y. and Wang M., Smoothed molecular dynamics for large step time integration, Computer Modeling in Engineering & Sciences. 2007, 20: 177-192. |
|
Shen J.H., Lin K.C., Chen S.H. and Sze K.Y., Bifurcations and route-to-chaos analyses for Mathieu-Duffing oscillator by the Incremental Harmonic Balance Method, Nonlinear Dynamics. 2008, 52: 403-414. |
|
Sze
K.Y. and Liu X.H., A new particle model for
fabric drap simulation, 2007 International Symposium on Computational
Mechanics. |
|
Sze K.Y. and Liu X.H., Fabric drape simulation by solid-shell finite element method, Finite Elements in Analysis & Design. 2007, 43: 819-838. |
|
Sze
K.Y. and Liu G., Hybrid-trefftz finite
element models for plane helmholtz problems, Proceedings of |
|
Xu L.M., Fan H., Sze K.Y. and Li C.L., Elastic property prediction by finite element analysis with random distribution of materials for heterogeneous solids, International Journal of Mechanics & Materials in Design. 2007, 3: 319-327. |
|
Project Title: |
Computer modeling of components made of multi heterogeneous materials |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Incentive Award for RGC CERG Fundable But Not Funded Projects |
|
Start Date: |
07/2003 |
|
Abstract: |
|
N/A |
|
Project Title: |
Heterogeneous solid modeling using materially defined geometric entities |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
04/2005 |
|
Abstract: |
|
To extend and enchance the traditional homogeneous solid modeling methods by incorporating material information in the 1D, 2D and 3D geometric entities. Such a representation guarantees a more flexible material variation to be defined throughout the 3D space and the user's design intent can be intuitively captured. Moreover, a range of heterogeneous objects which are difficult or unable to be defined with existing methods can be represented. Unlike existing heterogeneous modeling schemes, this proposal defines the 1D and 2D heterogeneous geometric entities first and then hierarchically builds complex 3D solids from the lower level heterogeneous entities. To represent heterogeneous solids uniformly and generically, a Heterogeneous Feature Tree (HFT) is introduced and a material evaluation algorithm is proposed to dynamically determine or define the material information at a point. |
|
Project Title: |
Computer aided modeling of porous objects |
|
Investigator(s): |
|
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2007 |
|
Abstract: |
|
This proposal aims to investigate the problems of porous objects modelling with a view to applying the models to some useful applications. For example, in Bio-CAD like bone implants where the bio-compability of the implants with human tissues is of huge concern. In drug delivery problems where the path and boundaries of the injected fluids are greatly influenced by the distribution of the pores. In the design of filters where the sizes and shapes of the pores are of paramount importance. |
|
List of Research Outputs |
|
Kou X. and Tan S.T., "Heterogeneous Object Design: An Integrated CAX Perspective" , In: Alexander Pasko, Valery Adzhiev, Peter Comninos, "Heterogeneous Objects Modeling and Applications", Lecture Notes in Computer Science. Springer, 2008, 4889. |
|
Kou X. and Tan S.T., "\CAD4D: A Novel CAD system for design in 4D space, Hong Kong ICT Awards 2007: Best Innovation and Research (Open) Certificate of Merit (Best Innovation), Hong Kong Internet Professional Association. 2008. |
|
Kou
X. and Tan S.T., Design by
talking with computers, International CAD Conference and Exhibition
(CAD'08). |
|
Researcher
: Tan X |
|
List of Research Outputs |
|
Tan X. and Soh A.K., Multi-objective optimization of the sandwich panels with prismatic cores using genetic algorithms, International Journal of Solids and Structures. UK, Pergamon-Elsevier Science Ltd., 2007, 44(17): 5466-5480. |
|
Researcher
: Tang B |
|
List of Research Outputs |
|
Li Z., Lu W.W., Chiu P.K.Y., Lam R.W.M., Tang B., Ngan A.H.W., Wong C.T., Fang D., Cheung K.M.C. and Luk K.D.K., Micro-architectural and nano-mechanical properties of trabecular bone with strontium treatment in large animal model of osteoporosis, 27th Annual Congress of the Hong Kong Orthopaedic Association, Hong Kong, November 17-18, 2007. |
|
Li Z., Lu W.W., Chiu P.K.Y., Lam R.W.M., Cheung K.M.C., Tang B., Ngan A.H.W. and Luk K.D.K., Micro-architecture and Nano-mechanics of Lumbar Vertebra with Strontium Treatment in Large Animal Model of Osteoporosis, 54th Annual Meeting of the Orthopaedic Research Society, San Francisco, USA. 2008, P276. |
|
Ni G.X., Lu W.W., Tang B., Ngan A.H.W., Chiu K.Y., Cheung K.M.C., Li Z. and Luk K.D.K., Effect Of Weight-bearing On
Bone-bonding Behavior Of Strontium-containing Hydroxyapatite Bone Cement, Journal
Of Biomedical Materials Research Part A. 111 RIVER ST, HOBOKEN, NJ 07030
USA, WILEY-LISS, DIV JOHN WILEY & SONS INC, 2007, |
|
Tang B. and Ngan A.H.W., Critical Issues In Mechanical Characterization Of Biological Tissues Using Nanoindentation, 1st International Conference From Nanoparticles&nanomaterials To Nanodevices&nanosystems. 2008, 336. |
|
Tang B. and Ngan A.H.W., Nanoindentation measurement of mechanical properties of soft solid covered by a thin liquid film, Soft Materials. Taylor & Francis, 2007, 5(4): 169-181. |
|
Researcher
: Tong HW |
|
List of Research Outputs |
|
Tong H.W. and Wang M., A systematic
investigation into electrospinning parameters on the formation of PHBV tissue
engineering scaffolds, Proceedings of the 8th World Biomaterials Congress.
|
|
Tong H.W. and Wang M.,
Electrospinning of aligned biodegradable polymer fibers and composite fibers
for tissue engineering applications, Journal of Nanoscience and
Nanotechnology. |
|
Tong H.W. and Wang M.,
Electrospinning of fibrous PHBV tissue engineering scaffolds: fiber diameter
control, fiber alignment and mechanical properties, Proceedings of the 5th
International Conference on Information Technology and Applications in
Biomedicine (ITAB 2008). |
|
Tong H.W. and Wang M., Mechanical
evaluation of electrospun nonwoven and aligned-fiber structures developed for
tissue engineering applications, Proceedings of the 8th World Biomaterials
Congress. |
|
Wang
M., Tong H.W. and Lo
M., Electrospinning of polymer tissue engineering scaffolds: effects of
emitting electrode polarity, Proceedings of the 8th World Biomaterials
Congress. |
|
Researcher
: Wang F |
|
List of Research Outputs |
|
Wang F., Chen K.Z. and Feng X.A., A simulation model for the fabrication of components made from multiphase perfect materials, Robotics and Computer-Integrated Manufacturing. Exeter, UK, Elsevier Ltd., 2008, 24: 514-523. |
|
Wang F.,
A study to determine a practical technology for manufacturing components made
of a multiphase perfect materials, Ph.D. Thesis. Hong Kong, The |
|
Wang F., Chen K.Z. and Feng X.A., Modeling of plasma spraying process to manufacture hybrid materials, Computer-aided Design. Exeter, UK, Elsevier Ltd., 2007, 39: 1120-1133. |
|
Wang F.,
Chen K.Z. and Feng X.A., Virtual
manufacturing to design a manufacturing technology for components made of a
multiphase perfect material, International CAD Conference and Exhibition
(CAD'08). |
|
Researcher
: Wang L |
|
Project Title: |
Experimental visualization of droplet formation and breakup in T-junctions of microchannels |
|
Investigator(s): |
Wang L |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
03/2006 |
|
Abstract: |
|
We propose to develop and investigate a microfluidic technique for the formation of fine and monodispersed emulsions (dispersions of one liquid, dispersed liquid, in a second immiscible liquid, dispersing liquid). The technique exploits the microfluidic technology-offered capability of the precise handling of small fluid volume and is known as Two T-junction Emulsification (TTE).The technique has a number of advantages, including (1) the generation of one droplet at a time, allowing control over the formation of individual droplets and enabling the generation of highly monodispersed droplets; (2) the second T-junction in TTE, enabling generation of a smaller droplet size than that of microchannel cross-section; and (3) a simple microchannel structure without active/moving components, providing the capability for significant parallelization and high throughput. A fundamental understanding of droplet formation and breakup at T-junctions of microchannels is essential for the optimal design and process control of proposed novel emulsion generators. The project therefore seeks to achieve the following goals:(1) Visualize droplet formation and breakup experimentally by a high speed digital imaging system equipped with a long distance microscope; (2) Find the droplet formation/breakup pattern, the droplet diameter and the standard derivation in the droplet diameter as a function of flow rates of two fluids, geometrical parameters of the system and properties of two fluids (viscosity, interfacial tension, surfactant concentration); (3) Identify governing dimensionless parameters and develop phase diagram of droplet formation/breakup patterns and empirical relations to predict the droplet diameter and its standard derivation. |
|
Project Title: |
Nano-/pico-liter bubbles: formation and breakup |
|
Investigator(s): |
Wang L |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Small Project Funding |
|
Start Date: |
12/2006 |
|
Abstract: |
|
We propose to develop and investigate a microfluidic technique for the formation of monodispersed nano-/pico-liter bubbles (dispersions of a gas, dispersed liquid, in a second immiscible liquid, dispersing liquid). The technique exploits the microfluidic technology-offered capability of the precise handling of small fluid volume and is known as Two T-junction bubble generator (TTBG).The technique has a number of advantages, including (1) the generation of one bubble at a time, allowing control over the formation of individual bubbles and enabling the generation of highly monodispersed bubbles; (2) the second T-junction in TTBG, enabling generation of a smaller bubble size than that of microchannel cross-section; and (3) a simple microchannel structure without active/moving components, providing the capability for significant parallelization and high throughput. A fundamental understanding of bubble formation and breakup at T-junctions of microchannels is essential for the optimal design and process control of proposed novel bubble generators. The project therefore seeks to achieve the following goals:(1) Visualize bubble formation and breakup experimentally by a high speed digital imaging system equipped with a long distance microscope; (2) Find the bubble formation/breakup pattern, the bubble diameter and its standard derivation, and the bubble generation frequency as a function of pressures of two fluids, geometrical parameters of the system and properties of two fluids (viscosity, interfacial tension, surfactant concentration); (3) Identify governing dimensionless parameters and develop phase diagram of bubble formation/breakup patterns and empirical relations to predict the bubble diameter, its standard derivation and its generation frequency. |
|
Project Title: |
Numerical and experimental investigations of developing, three-dimensional liquid flow in curved microchannels |
|
Investigator(s): |
Wang L |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
01/2007 |
|
Abstract: |
|
(1) Purpose An understanding of liquid
flow in curved microchannels is crucial to the optimal design and process
control of various microfluidics devices and modern instruments used in
chemical analysis and biomedical diagnostics. The goals of this project are
to study characteristics of developing, three-dimensional (3D) flow in curved
microchannels, to quantify when and to what extent various effects (channel
curvature, disturbances, electric double-layer (EDL), entrance and three
dimensional transport, initial conditions, surface roughness) become
important in microchannels, to reconcile inconsistencies in the reported flow
friction data in the literature, and to develop reliable design tools of
correlating relations for friction factors. (2) Key Issues When transient
flow has died away, flow in curved microchannels can have multiple states,
each corresponding to different INITIAL conditions of flow. The flow in
practical curved microchannels is also subject to the effect of disturbances.
Both the initial conditions and the disturbances are normally unknown or
cannot be accurately determined. Therefore, sets of steady flow states must
be described (multiplicity study to address the effect of initial conditions);
stable and experimentally observable subsets must be separated from the
others (stability study to address the effect of disturbances). EDL and
surface roughness effects, which are normally neglected for flow in
macrochannels, must also be addressed. Another key issue is to find
correlating relations of friction factors. (3) Possible outcomes 1. Solution
structure: number of solution branches and their connectivity through
different types of singular points; 2. Flow structure: flow patterns and
distribution of friction factor for each flow state; 3. Dynamic responses of
multiple flows to finite random disturbances; 4. Phenomena related to the
transition to turbulence such as temporal/spatial oscillation of flows,
period doubling, intermittency, and chaotic oscillation; 5. Quantification of
effects of channel curvature, disturbances, EDL, three dimensional transport,
initial conditions and surface roughness; 6. A general program package for
continuation, bifurcation and stability analysis of three-dimensional curved
microchannel flows; and 7. Reliable correlating relations for friction
factors. (4 ) Significance This project will make a concrete contribution to
the study of liquid flow in curved microchannels, which are of paramount
importance for a variety of microfluidic systems. Understanding of flow in
microchannels from this project will be of considerable general significance
for novel, better and more efficient designs of microdevices used in the
automotive industry, biomedical engineering, chemical processes, computer
chips, lab-on-a-chip, microfluidic chips, micro mixers, micropower
generation, microreactors and micro total analysis systems. More
particularly, the project will provide more reliable design tools of
correlating relations for friction factors for these microdevices.
Microchannels are a very important area of emerging technology, and are
playing an increasingly important role in the continuing advances of MEMS
worldwide. The establishment of a critical technology base for |
|
List of Research Outputs |
|
Ai B.Q., Wang L. and Liu L.G., Flashing motor at high transition rate, Chaos, Solitons & Fractals. 2007, 34: 1265-1271. |
|
Cheng L., Xu M.T. and Wang L., Thermal oscillation and thermodynamics of single-phase-lagging heat conduction, Chinese Science Bulletin. 2008, 53: 732-736. |
|
Fan J., Wang L. and Cheng L., Electrokinetic effects on flow and heat transfer in parallel-plate microchannels, International Journal of Nonlinear Sciences and Numerical Simulation. 2007, 8: 335-345. |
|
Fan J., Wang L. and Cheng L., Forced convection in rectangular microchannels: electrokinetic effects, International Journal of Nonlinear Sciences and Numerical Simulation. 2007, 8: 359-374. |
|
Liao X.X., Wang L. and Yu P., Science and
Complexity, Stability of Dynamical Systems. |
|
Liu F. and Wang L., Chaotic oscillations of forced convection in tightly coiled ducts, Numerical Heat Transfer A. 2007, 51: 179-194. |
|
Wang
L., Xu M.T. and Wei X., Dual-phase-lagging and
porous-medium heat conduction processes, In: P. Vadasz, Emerging Topics in
Heat and Mass Transfer in Porous Media - from Bioengineering and
Microelectronics to Nanotechnology. |
|
Wang L. and Wei X., Equivalence between dual-phase-lagging and two-phase-system heat conduction processes, International Journal of Heat and Mass Transfer. 2008, 51: 1751-1756. |
|
Wang L. and Liu F., Forced convection in slightly curved microchannels, International Journal of Heat and Mass Transfer. 2007, 50: 881-896. |
|
Wang L. and Liu F., Forced convection in tightly coiled ducts: bifurcation in a high Dean number region, International Journal of Non-linear Mechanics. 2007, 42: 1018-1034. |
|
Wang
L., Zhou
X. and Wei X., Heat
Conduction: Mathematical Models and Analytical Solutions. |
|
Wang L., Modelling of subgrid-scale fluxes, Chaos, Solitons & Fractals. 2007, 34: 368-375. |
|
Wang L., Nanofluids: review and progress, The 2nd Integration & Commercialization of Micro & Nanosystems International Conference & Exhibition. ASME, 2008, MicroNano2008-70188. |
|
Wang
L., Nanofluids: synthesis and heat conduction
nature, The first ASME Micro/Nanoscale Heat Transfer International
Conference. |
|
Wang
L., Structural thermodynamics, Keynote
lecture, The Advanced Workshop on Constructal Human Dynamics, Security and
Sustainability, . |
|
Wei
X., Pang S.Y. and Wang L.,
Do unknown initial conditions and disturbances matter to microchannel forced
convection?, The first ASME Micro/Nanoscale Heat Transfer International
Conference. |
|
Researcher
: Wang M |
|
Project Title: |
Bioactive and biodegradable composites for bone tissue repair |
|
Investigator(s): |
Wang M, Lu WW |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
12/2005 |
|
Abstract: |
|
The objectives of this project are: 1) to fabricate and develop bioceramic/PHBV composites; 2) to study the composites through structural, mechanical and biological analyses; 3) to investigate the bioactivity and biodegradation behaviour of the composites. |
|
Project Title: |
An Investigation into Metallic Scaffolds for Hard Tissue Repair |
|
Investigator(s): |
Wang M |
|
Department: |
Engineering Faculty |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
07/2006 |
|
Abstract: |
|
The purpose of this project is to investigate production techniques for metallic scaffolds for tissue regeneration purposes and to evaluate the scaffolds produced. Key issues to be addressed in the project include:1) the feasibility of producing metallic scaffolds using Ti and Mg which have desired porous studctures;2) evaluating the structure and mechanical propoerties of the scaffolds;3) studying the bioactivity and biodegradation behaviour of the scaffolds. |
|
Project Title: |
Fibrous Membranes Consisting of Aligned Nanofibers and of Multilayered Structures for Tissue Engineering |
|
Investigator(s): |
Wang M |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
03/2007 |
|
Abstract: |
|
The purpose of this project is to investigate the fabrication of fibrous membranes of aligned fibers and of multilayered structures for tissue engineering applications using the electrospinning technique and to characterise and evaluate the membranes produced. Key issues to be addressed in the project include:1) the feasibility of producing aligned nanofibers of biodegradable polymers using our own designed system;2) the investigation into making multilayered structures using aligned fibers and into producing composite fibers;3) preliminary study of the structure and mechanical propoerties of the fibrous membranes;4) preliminary study of the biodegradation behaviour and bioactivity of fibrous membranes produced |
|
List of Research Outputs |
|
Chen Y., Cho M.R., Mak A.F.T., Li J.S., Wang M. and Sun S., Morphology and
adhesion of mesenchymal stem cells on PLLA, apatite and apatite/collagen
surfaces, Journal of Materials Science: Materials in Medicine. |
|
Duan
B., Wu L., Yuan X., Hu Z., Li X., Zhang Y., Yao K. and Wang M., Hybrid nanofibrous
membranes of PLGA/Chitosan fabricated via electrospinning array, Journal
of Biomedical Materials Research Part A. USA, Wiley Periodicals, Inc.,
2007, |
|
Duan
B., Zhou W., Cheung W.L. and Wang M., Synthesis of Ca-P
nanoparticles and fabrication of Ca-P/PHBV microspheres for bone tissue
engineering, Proceedings of the 1st International Symposium on Surface and
Interface of Biomaterials. |
|
Duan
B., Zhou W., Cheung W.L. and Wang M., Totally bioresorbable
nanocomposite microspheres and scaffolds for bone tissue engineering, Proceedings
of the 11th Annual Conference on Ceramics, Cells and Tissues. |
|
Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser Sintering: Part I. synthesis of Ca-P and manufacture of
Ca-P/PHBV nanocomposite microspheres, Proceedings of the 8th World
Biomaterials Congress. |
|
Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser Sintering: Part II. scaffold fabrication and
characterization, Proceedings of the 8th World Biomaterials Congress. |
|
Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser sintering: Part III. process optimization, Proceedings
of the 8th World Biomaterials Congress. |
|
Liu
Y. and Wang M., Dynamic
mechanical behaviour of b-tricalcium phosphate reinforced
poly(hydroxybutyrate-co-hydroxyvalerate), Proceedings of the 8th World Biomaterials
Congress. |
|
Liu
Y. and Wang M.,
Fabrication and characteristics of hydroxyapatite reinforced polypropylene as
a bone analogue biomaterial, Journal of Applied Polymer Science. |
|
Liu
Y. and Wang M., Flexural
properties and failure behavior of TCP/PHB biocomposite, Proceedings of
the 8th World Biomaterials Congress. |
|
Liu
Y. and Wang M., Thermal
analysis and crystallinity study of bioresorbable polymer composites
containing particulate b-TCP, Proceedings of the 8th World Biomaterials Congress. |
|
Sultana
N. and Wang M., An
investigation into water uptake of composite scaffolds and films based on
PHBV/PLLA polymer blends, Proceedings of the 8th World Biomaterials
Congress. |
|
Sultana
N. and Wang M., Fabrication
of HA/PHBV composite scaffolds through the emulsion freezing / freeze-drying
process and characterisation of the scaffolds, Journal of Materials
Science: Materials in Medicine. |
|
Sultana
N. and Wang M., New
composite scaffolds based on PHBV/PLLA polymer blends for bone tissue
engineering, Proceedings of the 8th World Biomaterials Congress. |
|
Sultana
N. and Wang M.,
PHBV/PLLA-based composite scaffolds containing nano-sized calcium phosphate
particles for bone tissue engineering, Proceedings of the International
Conference on Materials for Advanced Technologies 2007 (ICMAT 2007). |
|
Sultana
N. and Wang M., In
vitro Degradation of HA-containing and PHBV/PLLA-based composite
scaffolds, Proceedings of the 8th World Biomaterials Congress. |
|
Sun
T. and Wang M.,
Apatite/TiO2 composite coatings formed on Ti, Ti-6Al-4V and NiTi shape memory
alloy through a biomimetic process, Proceedings of the 11th Annual
Conference on Ceramics, Cells and Tissues. |
|
Sun
T. and Wang M.,
Characteristics of the titania layer formed on NiTi shape memory alloy
through a low temperature process, Proceedings of the 8th World
Biomaterials Congress. |
|
Sun
T. and Wang M., Chemical
stability of the titania layer formed synthetically on NiTi shape memory
alloy as a barrier to prevent nickel Ion release, Proceedings of the 5th
International Conference on Information Technology and Applications in
Biomedicine (ITAB 2008). |
|
Sun
T. and Wang M.,
Low-temperature biomimetic fabrication and characterization of Apatite/TiO2
composite coating on Ti, Ti-6Al-4V and NiTi shape memory alloy, Proceedings
of the 1st International Symposium on Surface and Interface of Biomaterials.
|
|
Sun
T. and Wang M.,
Nanoindentation and nano-scratch studies of Apatite/TiO2 composite coating
synthesized on surfaces of Ti, Ti-6Al-4V and NiTi shape memory alloy, Proceedings
of the 1st International Symposium on Surface and Interface of Biomaterials.
|
|
Sun
T. and Wang M., Structure
and mechanical properties of Apatite/TiO2 composite coating synthesized on
Ti-6Al-4V alloy, Proceedings of the 8th World Biomaterials Congress. |
|
Tong
H.W. and Wang M., A
systematic investigation into electrospinning parameters on the formation of
PHBV tissue engineering scaffolds, Proceedings of the 8th World
Biomaterials Congress. |
|
Tong
H.W. and Wang M.,
Electrospinning of aligned biodegradable polymer fibers and composite fibers
for tissue engineering applications, Journal of Nanoscience and
Nanotechnology. |
|
Tong
H.W. and Wang M., Electrospinning
of fibrous PHBV tissue engineering scaffolds: fiber diameter control, fiber
alignment and mechanical properties, Proceedings of the 5th International
Conference on Information Technology and Applications in Biomedicine (ITAB
2008). |
|
Tong
H.W. and Wang M.,
Mechanical evaluation of electrospun nonwoven and aligned-fiber structures
developed for tissue engineering applications, Proceedings of the 8th
World Biomaterials Congress. |
|
Wang
M., Biomaterials for hard tissue substitution
and tissue engineering, Proceedings of the symposium on health technology
and informatics. |
|
Wang
M., Biomimicking in biomaterials development
and tissue engineering: from micro to nano, Proceedings of the
International Conference on Materials for Advanced Technologies 2007 (ICMAT
2007). |
|
Wang
M., Composite scaffolds for tissue
engineering, Proceedings of the 6th National Conference on Functional
Materials & Applications and International Forums on Functional Materials.
|
|
Wang
M., Tong
H.W. and Lo M., Electrospinning of polymer tissue engineering scaffolds:
effects of emitting electrode polarity, Proceedings of the 8th World
Biomaterials Congress. |
|
Wang
M., Guest Editorial: Composites in Medicine, Journal
of Materials Science: Materials in Medicine. |
|
Wang
M., Hybrid biomaterials, Proceedings of
the 2007 Regional Symposium on Biophysics and Medical Physics. |
|
Wang
M., Materials selection and scaffold
fabrication for tissue engineering in orthopaedics, In: L.Qin, H.K.Genant,
J.Griffith and K.-S.Leung, Advanced Bioimaging Technologies in Assessment
of Quality of Bone and Scaffold Materials. Springer, |
|
Wang M., Member of Technical Committees , TC229 Nanotechnologies, International Organization for Standardization. International, 2008. |
|
Wang M., Member of Technical Committees, TC150 Implants for surgery, International Organization for Standardization. International, 2008. |
|
Wang M., Member of Technical Committees, TC194 Biological Evaluation of Medical Devices, the International Organization for Standardization. International, 2008. |
|
Wang
M., Member of the Editorial Board, Biomedical
Materials: Materials for Tissue Engineering & Regenerative Medicine. |
|
Wang
M., Member of the Editorial Board, Composites
Science and Technology. The |
|
Wang
M., Member of the Editorial Board, Frontiers
of Materials Science in |
|
Wang
M., Member of the Editorial Board, IET
Nanobiotechnology. |
|
Wang
M., Member of the Editorial Board, Journal
of Biomimetics, Biomaterials and Tissue Engineering. |
|
Wang
M., Member of the Editorial Board, Journal
of Materials Science: Materials in Medicine. |
|
Wang
M., Member of the Editorial Board, Surface
and Coatings Technology . The |
|
Wang
M., Member of the Expert Panel, Project
Selection/Awarding Panel for Biophysics and Biomedical Engineering, National
Natural Science Foundation of China. |
|
Wang
M., Nanofibers, nanoparticles and
nanocomposites for tissue engineering applications, Proceedings of the
11th Annual Conference on Ceramics, Cells and Tissues. |
|
Wang
M., Nanomaterials for human tissue repair, Proceedings
of the 2007 International Conference on Bionano Sciences. |
|
Wang
M., Surface and interface controls for
biomaterials, Proceedings of the 1st International Symposium on Surface
and Interface of Biomaterials. |
|
Zhou
W., Duan B., Wang M. and Cheung W.L., Crystallization kinetics of
Poly(L-Lactide)/Carbonated hydroxyapatite nanocomposite under isothermal and
non-isothermal conditions, Proceedings of the 8th World Biomaterials
Congress. |
|
Zhou W., Lee S.H., Wang M., Cheung W.L. and Ip W.Y., Selective Laser Sintering Of Porous Tissue Engineering Scaffolds From Poly(l-lactide)/carbonated Hydroxyapatite Nanocomposite Microspheres, Journal Material Sci: Mater Med. 2007, 19: 2535-2540. |
|
Zhou
W., Wang M., Cheung W.L., Yuen C.K. and Ip W.Y., Selective laser sintered
Meso-porous PLLA and PLLA/CHAp nanocomposite scaffolds for bone tissue
engineering, Proceedings of the 8th World Biomaterials Congress. |
|
Zhou
W., Wang M., Cheung W.L., Gao B.C. and Jia D.M.,
Synthesis of carbonated hydroxyapatite nanospheres through nanoemulsion, Journal
of Materials Science: Materials in Medicine. |
|
Zhou
W., Wang M. and Cheung W.L., Thermal stability and in
vitro solubility of carbonated hydroxyapatite nanospheres, Proceedings of
the 8th World Biomaterials Congress. |
|
Researcher
: Wang Q |
|
List of Research Outputs |
|
Wang Q., Lam J., Wei Y. and Chen T., Iterative solutions of coupled discrete markovian jump lyapunov equations, Computers and Mathematics with Applications. Elsevier Ltd., 2008, 55(4): 843-850. |
|
Researcher
: Wei X |
|
List of Research Outputs |
|
Wang
L., Xu M.T. and Wei X.,
Dual-phase-lagging and porous-medium heat conduction processes, In: P.
Vadasz, Emerging Topics in Heat and Mass Transfer in Porous Media - from
Bioengineering and Microelectronics to Nanotechnology. |
|
Wang L. and Wei X., Equivalence between dual-phase-lagging and two-phase-system heat conduction processes, International Journal of Heat and Mass Transfer. 2008, 51: 1751-1756. |
|
Wang
L., Zhou X. and Wei X., Heat Conduction:
Mathematical Models and Analytical Solutions. |
|
Wei X.,
Pang S.Y. and Wang L., Do unknown
initial conditions and disturbances matter to microchannel forced
convection?, The first ASME Micro/Nanoscale Heat Transfer International
Conference. |
|
Researcher
: Wong HL |
|
List of Research Outputs |
|
Wong H.L., Wang M., Cheung P.T., Yao K.M. and Chan B.P., A 3D collagen microsphere culture system for GDNF-secreting HEK293 cells with enhanced protein productivity, Biomaterials. Elsevier Ltd., 2007, 28: 5369-5380. |
|
Researcher
: Wu CH |
|
List of Research Outputs |
|
Ng
C.O. and Wu C.H.,
Dispersion of suspended particles in a wave boundary layer, Proceedings of
the Seventeenth (2007) International Offshore and Polar Engineering
Conference, Lisbon, Portugal, July 1–6. |
|
Researcher
: Xie Y |
|
List of Research Outputs |
|
Xie Y., Kong Y., Soh A.K. and Gao H.J., Electric field-induced translocation of single-stranded DNA through a polarized carbon nanotube membrane, Journal of Chemical Physics. USA, AMER Inst. Physics, 2007, 127(22): 225101. |
|
Xie Y.,
MD simulations of bio-nano-system: controllable translocation and selective
separation of single-stranded DNAS through a polarized CNT memberane, Ph.D.
Thesis. Hong Kong, The |
|
Xie Y.,
Kong Y., Gao H.J. and Soh A.K.,
Molecular dynamics simulation of polarizable carbon nanotubes, Computational
Materials Science. |
|
Researcher
: Xiong J |
|
List of Research Outputs |
|
Xiong J., Synthesis of dynamic systems with markovian characteristics, Ph.D.
Thesis. Hong Kong, The |
|
Researcher
: Xu Z |
|
List of Research Outputs |
|
Xu Z. and Ngan A.H.W., Indentation-induced crystallisation in amorphous silicon thin films, International Journal of Surface Science and Engineering. Inderscience Enterprises Ltd., 2007, 1(2/3): 308-321. |
|
Xu Z., Phase
transformation and properties of magnetron co-sputtered GeSi thin films, Ph.D.
Thesis. Hong Kong, The |
|
Researcher
: Yan K |
|
List of Research Outputs |
|
Yan K.
and Soh A.K., Effects of extrinsic
grain boundary defects on Kapitza resistance under laser pulse, Proceedings
of the Eighth International Conference on Fundamentals of Fracture (ICFFVIII).
|
|
Yan K.
and Soh A.K., Simulation of surface
effects in energy dissipation of ultra-high-frequency (UHF) nanocantilevers, Proceedings
of the SPIE. |
|
Researcher
: Yang J |
|
List of Research Outputs |
|
Yang J.,
Ng C.O. and Zhang D., Numerical study of water waves
generated by a submerged moving body in a two-layer fluid system, Proceedings
of EM08, Inaugural International Conference of the Engineering Mechanics
Institute, Minneapolis, Minnesota, USA, May 18–21. |
|
Researcher
: Yang L |
|
List of Research Outputs |
|
Yang L. and Li Y., Thermal environment and airflow in a semi-enclosed space surrounded by buildings – a numerical study, Presented in the 6th International Indoor Air Quality, Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007), Sendai, October 28th - 30th, 2007.. 2007. |
|
Researcher
: Yeung CW |
|
List of Research Outputs |
|
Chan
B.P., Hui T.Y., Yeung C.W. and Chan G.C.F., Self-Assembled
Collagen-Human Mesenchymal Stem Cell (hMSCs) Microspheres – Novel Bio-devices
for Cell Delivery, The 34th Annual Meeting and Exposition of the
Controlled Release Society, 7-11 Jul 2007. |
|
Chan B.P., Hui T.Y., Yeung C.W., Li J., Mo F.Y. and Chan G.C.F., Self-assembled collagen–human mesenchymal stem cell microspheres for regenerative medicine, Biomaterials. 2007, 28: 4652-4666. |
|
Researcher
: Yip LP |
|
List of Research Outputs |
|
Chow K.W., Yip L.P. and Grimshaw R.H.J., Novel solitary pulses for a variable coefficient derivative nonlinear Schrödinger equation, Journal of the Physical Society of Japan. 2007, 76: 074004(6 pages). |
|
Yip L.P., Nonlinear and localized modes in hydrodynamics and vortex
dynamics, M.Phil. Thesis. Hong Kong, The |
|
Researcher
: Yip LP |
|
List of Research Outputs |
|
Chow K.W., Yip L.P. and Grimshaw R.H.J., Novel solitary pulses for a variable coefficient derivative nonlinear Schrödinger equation, Journal of the Physical Society of Japan. 2007, 76: 074004(6 pages). |
|
Yip L.P., Nonlinear and localized modes in hydrodynamics and vortex
dynamics, M.Phil. Thesis. Hong Kong, The |
|
Researcher
: Zhang D |
|
List of Research Outputs |
|
Grimshaw R.H.J., Zhang D. and Chow K.W., Generation of solitary waves by transcritical flow over a step, Journal of Fluid Mechanics. 2007, 587: 235 - 254. |
|
Yang
J., Ng C.O. and Zhang D., Numerical study of water
waves generated by a submerged moving body in a two-layer fluid system, Proceedings
of EM08, Inaugural International Conference of the Engineering Mechanics
Institute, Minneapolis, Minnesota, USA, May 18–21. |
|
Zhang
D. and Chow
K.W., Propagation of long waves over a step, Hong Kong – |
|
Researcher
: Zhao X |
|
List of Research Outputs |
|
Liu J.X., Zhao X. and Soh A.K., |
|
Researcher
: Zheng G |
|
Project Title: |
Atomistic Simulation Study on Deformation Mechanisms in Nanocrystalline H.C.P. Metals |
|
Investigator(s): |
Zheng G |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
08/2005 |
|
Abstract: |
|
The main objective of this project is to establish a systematic and quantitative approach for computer simulation of mechanical deformation in nanocrystalline (nc) metals. We focus our investigations on the deformation in nc hexagonal close-packed (hcp) metals. |
|
Project Title: |
Synthesis and Mechanical Properties of Amorphous Nanowires |
|
Investigator(s): |
Zheng G |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
02/2006 |
|
Abstract: |
|
Amorphous alloys or metallic glasses are known for large elastic strain, high fracture strength, high strength-to-density ratio, good thermal conductivity and corrosion resistance. Bulk metallic glasses (BMGs) are a new generation of structural materials desirable for industrial applications. Recently invented iron-based BMGs are even considered to form a very promising basis for affordable and high performance structural materials. They are so-called 'amorphous steel' and can be used in places where standard high strength steels are used, for examples, in sporting goods, building construction and military, etc.. However, metallic glasses including the iron-based BMGs are brittle. Unlike crystalline alloys, amorphous alloys do not have dislocation-like defects during deformation process and the deformation is localized in a few narrow regions, or shear bands. There is no work hardening during deformation process and fracture occurs along one of the shear bands when deformation inside the band becomes so large that it physically separates the system. The localized shear bands are about 10nm thick and orient in the direction of the maximum resolved shear stress. Because of these unique features of deformation behaviors in metallic glasses, it is generally believed that the confinement of nano-sized shear zones in composites of metallic glasses and nano-crystallites can improve the work hardening and plastic strain of metallic glasses. Unfortunately current theory fails to predict the atomistic deformation defects in metallic glasses, e.g., how and where the shear bands form and how they propagation. Since 1970's, a general theory of free-volume defect has been proposed to account for the shear banding in metallic glasses. It is suggested that atoms with loosely packed neighbors have extra volumes and can be moved to perform a local slip in disk shaped region typically of 1nm thickness. When accumulation of these dilated regions reaches a threshold density, localized shear band forms. Because of the lack of long range translational symmetry in metallic glasses and the rapid deformation process confined in narrowly localized shear zones, the free-volume defects hypothesized to be responsible for the shear banding can not been well characterized directly from electron microscopy. In searching for the deformation mechanisms in metallic glasses, we propose to investigate the size effect on the mechanical deformation in amorphous nanowire. This is because of the following reasons. First, the deformation defects are in atomistic scales and the corresponding shear banding is in nano-sized region. The only way to alternate the formation of shear bands without changing the composition and glassy nature of these alloys is to reduce one or two dimensions of amorphous alloys to a size compatible to the shear banding region. A good system that can fulfill this purpose is amorphous wire with diameter of about 100nm. If the free-volume defects are atomistic deformation defects responsible for the shear banding, significant size-dependent mechanical properties could be observed. Second, the deformation of amorphous nanowire can be compared with the atomistic simulation results. In molecular dynamics simulation, tensile deformation is usually performed in an amorphous nanowire with diameter within 100nm because of the limitation of computing power. Furthermore, the simulation results reveal a surprising feature that the strength and ductility of amorphous nanowire increase with decreasing nanowire diameter. This size-effect on deformation can be considered as a method to improve the ductility of metallic glasses and have to be confirmed by experiments. Third, deformation in nanometer scales is of scientific and engineering importance because of the rapid development of nano-electro-mechanical systems (NEMS). Although some mechanical behaviors of nanostructured crystalline solids have been revealed, little is known about the mechanical properties of nano-sized amorphous alloys. |
|
Project Title: |
Theoretical investigation and atomistic simulation of deformation in iron-based bulk metallic glasses |
|
Investigator(s): |
Zheng G |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Competitive Earmarked Research Grants (CERG) |
|
Start Date: |
08/2006 |
|
Abstract: |
|
Purpose: The objective of this proposed research is to explore the deformation mechanisms in bulk metallic glasses (BMGs).We focus our research on iron-based BMG. Based on atomistic calculations, theory of mechanical deformation in these novel materials will be established. Key issues: BMGs are amorphous alloys with typical dimensions of millimeters to inches. They are known for high fracture strength, high strength-to-density ratio, and corrosion resistance. Unlike crystalline alloys, BMGs do not have dislocation-like defects during deformation process and the deformation is localized in nature. Although mechanical properties of BMG such as tensile or compression test, fracture and fatigue tests have been well studied in the past decade, a unified picture on microscopic deformation mechanisms governing their brittle nature is still lacking. Iron-based BMGs were invented in the past few years and have several features that deserve dedicated attention. First, iron-based BMGs are superior to other BMGs containing zirconium or palladium because theoretically they would possess larger strength and their main content, iron, is relatively cheap. Second, they are promising functional materials and structural materials in the industrial applications. Key issues: However, there are still several critical issues that have not been resolved to allow widespread applications of iron-based BMGs. First, they are brittle. Microscopic deformation mechanisms should be understood before materials design and processing techniques can be developed to increase their ductility. Second, is the role of iron atoms in the formation of atomistic defects called free-volume defects. Because of the lack of long range translational symmetry in BMG and the rapid deformation process confined in narrowly localized shear zones, the fundamental mechanisms of mechanical behavior in BMG are difficult, or sometimes impossible to be determined and understood by experiment alone. Calculations based on quantum mechanics and molecular dynamics (MD) simulations provide useful tools to explore the microscopic deformation defects in these materials. Possible outcomes and significance: In this proposed research we plan to develop a theory of deformation in iron-based BMG by gaining the knowledge needed through quantum mechanics calculation. First of all the electronic structures of deformation defects affected by the presentation of iron atoms will be determined by the density functional theory. The atomistic results will fulfill our ultimate goal to develop a phase-field transition theory for description, characterization and prediction of deformation behaviors of iron-based BMG. Successful execution of this proposed research will allow deformation defects to be characterized at the atomistic scale for the first time. The theory and simulation approaches will lay a solid foundation for the design and development of strong and ductile iron-based BMGs. Moreover, the research outcomes will have significant scientific impact on the deformation mechanisms of BMG and add significant value to the engineering applications of BMGs. |
|
Project Title: |
: Mechanical properties of metal-coating carbon nanotubes |
|
Investigator(s): |
Zheng G |
|
Department: |
Mechanical Engg |
|
Source(s) of Funding: |
Seed Funding Programme for Basic Research |
|
Start Date: |
02/2007 |
|
Abstract: |
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Mechanical properties of light metals and alloys can be significantly enhanced by incorporating reinforcing fibers to form metal matrix composites. Because carbon nanotubes (CNTs) have nanoscale dimensions and ultra light weight (25% of the weight of steel), large Young's modulus (1-5TPa), high tensile strength (50-300GPa) and large uniform strain (40%), they are very promising in the producing of strong and light composite materials. Since the discovery of CNTs in 1991, the production costs of CNTs have been reduced dramatically [1]. Considerable attempts have been made to develop CNT composite materials with high strength-to-density ratio. Metal matrix composites with CNT reinforcements has attracted attention in the past decade because of the scientific and engineering needs for the strengthening of industrial metals and alloys, for examples aluminium or magnesium alloys, nanocrystalline metals and bulk metallic glasses. However, the mechanical properties of these composites are not as great as one would expect because of fabrication methods and the weak bonding between CNTs and the metal matrix. Pretreatment of CNTs by metal coating is needed prior to the fabrication of CNT-metal composites.There are two pivot issues that have not been resolved to allow widespread applications of CNT-reinforced metallic materials. First, at the atomistic scales the interaction among CNT and metal atoms or ions is unknown. Since the electronic structures of carbon in CNT are completely different with those in diamond and graphite, the interaction of metal atoms or ions with CNT may alternate the electrical, magnetic and mechanical properties of CNT but such changes have not been characterized experimentally or theoretically. Secondly, at the nano-scales the understanding of the electro-mechanical properties of CNT-metal interfaces is still lacking. The deformation mechanism of CNT-metal composite is determined by the electrical and mechanical responses of the interfaces. Therefore, understanding the mechanical behaviors of metal-coating CNTs is essential in developing metal-CNT composites with desired mechanical properties.The proposed research is designed to develop metal matrix composites using metal-coating CNTs. The objective of this research is to characterize the mechanical behaviors of CNTs coated with metallic materials. First, metal-coating CNTs will be synthesized by electrochemical techniques and their mechanical properties will be characterized. Second, mechanical properties of metal-coating CNTs will be predicted by atomistic modeling approaches and then compared with experimental results. The combination of experiments and modeling can optimize the mechanical properties of CNT coated with metallic materials and accelerate the development of CNT-metal nanocomposites. |
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List of Research Outputs |
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Liu S., Choy W.C.H., Jin L., Leung Y.P., Zheng G., wang J. and Soh A.K., Triple-crystal Zinc Selenide Nanobelts, J. Physical Chemistry C. 2007, 111: 9055-9059. |
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Researcher
: Zhou W |
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List of Research Outputs |
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Duan
B., Zhou W., Cheung W.L. and Wang M., Synthesis of Ca-P nanoparticles
and fabrication of Ca-P/PHBV microspheres for bone tissue engineering, Proceedings
of the 1st International Symposium on Surface and Interface of Biomaterials.
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Duan
B., Zhou W., Cheung W.L. and Wang M., Totally bioresorbable
nanocomposite microspheres and scaffolds for bone tissue engineering, Proceedings
of the 11th Annual Conference on Ceramics, Cells and Tissues. |
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Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser Sintering: Part I. synthesis of Ca-P and manufacture of
Ca-P/PHBV nanocomposite microspheres, Proceedings of the 8th World
Biomaterials Congress. |
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Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser Sintering: Part II. scaffold fabrication and
characterization, Proceedings of the 8th World Biomaterials Congress. |
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Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser sintering: Part III. process optimization, Proceedings
of the 8th World Biomaterials Congress. |
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Zhou W.,
Duan B., Wang M. and Cheung W.L., Crystallization kinetics of
Poly(L-Lactide)/Carbonated hydroxyapatite nanocomposite under isothermal and
non-isothermal conditions, Proceedings of the 8th World Biomaterials
Congress. |
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Zhou W., Lee S.H., Wang M., Cheung W.L. and Ip W.Y., Selective Laser Sintering Of Porous Tissue Engineering Scaffolds From Poly(l-lactide)/carbonated Hydroxyapatite Nanocomposite Microspheres, Journal Material Sci: Mater Med. 2007, 19: 2535-2540. |
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Zhou W.,
Wang M., Cheung W.L., Yuen C.K. and Ip W.Y., Selective laser sintered
Meso-porous PLLA and PLLA/CHAp nanocomposite scaffolds for bone tissue
engineering, Proceedings of the 8th World Biomaterials Congress. |
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Zhou W.,
Selective laser sintering of poly(L-Lactide)/carbonatd hydroxyapatite porous
scaffolds for bone tissue engineering, Ph.D. Thesis. Hong Kong, The |
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Zhou W.,
Wang M., Cheung W.L., Gao B.C. and Jia D.M.,
Synthesis of carbonated hydroxyapatite nanospheres through nanoemulsion, Journal
of Materials Science: Materials in Medicine. |
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Zhou W.,
Wang M. and Cheung W.L., Thermal stability and in
vitro solubility of carbonated hydroxyapatite nanospheres, Proceedings of
the 8th World Biomaterials Congress. |
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Researcher
: Zhou W |
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List of Research Outputs |
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Duan
B., Zhou W., Cheung W.L. and Wang M., Synthesis of Ca-P nanoparticles
and fabrication of Ca-P/PHBV microspheres for bone tissue engineering, Proceedings
of the 1st International Symposium on Surface and Interface of Biomaterials.
|
|
Duan
B., Zhou W., Cheung W.L. and Wang M., Totally bioresorbable
nanocomposite microspheres and scaffolds for bone tissue engineering, Proceedings
of the 11th Annual Conference on Ceramics, Cells and Tissues. |
|
Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser Sintering: Part I. synthesis of Ca-P and manufacture of
Ca-P/PHBV nanocomposite microspheres, Proceedings of the 8th World
Biomaterials Congress. |
|
Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser Sintering: Part II. scaffold fabrication and
characterization, Proceedings of the 8th World Biomaterials Congress. |
|
Duan
B., Wang M., Zhou W. and Cheung W.L., Totally bioresorbable
tissue engineering scaffolds based on Ca-P/PHBV nanocomposite and fabricated
via selective laser sintering: Part III. process optimization, Proceedings
of the 8th World Biomaterials Congress. |
|
Zhou W.,
Duan B., Wang M. and Cheung W.L., Crystallization kinetics of
Poly(L-Lactide)/Carbonated hydroxyapatite nanocomposite under isothermal and
non-isothermal conditions, Proceedings of the 8th World Biomaterials
Congress. |
|
Zhou W., Lee S.H., Wang M., Cheung W.L. and Ip W.Y., Selective Laser Sintering Of Porous Tissue Engineering Scaffolds From Poly(l-lactide)/carbonated Hydroxyapatite Nanocomposite Microspheres, Journal Material Sci: Mater Med. 2007, 19: 2535-2540. |
|
Zhou W.,
Wang M., Cheung W.L., Yuen C.K. and Ip W.Y., Selective laser sintered
Meso-porous PLLA and PLLA/CHAp nanocomposite scaffolds for bone tissue
engineering, Proceedings of the 8th World Biomaterials Congress. |
|
Zhou W.,
Selective laser sintering of poly(L-Lactide)/carbonatd hydroxyapatite porous
scaffolds for bone tissue engineering, Ph.D. Thesis. Hong Kong, The |
|
Zhou W.,
Wang M., Cheung W.L., Gao B.C. and Jia D.M.,
Synthesis of carbonated hydroxyapatite nanospheres through nanoemulsion, Journal
of Materials Science: Materials in Medicine. |
|
Zhou W.,
Wang M. and Cheung W.L., Thermal stability and in
vitro solubility of carbonated hydroxyapatite nanospheres, Proceedings of
the 8th World Biomaterials Congress. |
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Researcher
: Zhou X |
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List of Research Outputs |
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Wang
L., Zhou X. and Wei X., Heat Conduction:
Mathematical Models and Analytical Solutions. |
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Researcher
: Zhuang H |
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List of Research Outputs |
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Zhuang H., First-principles studies of metal-carbon nanotube systems, M.Phil.
Thesis. Hong Kong, The |
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Researcher
: Zhuang Z |
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List of Research Outputs |
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Li Y.,
Zhuang Z., Yang X. and Chen
B., Chinese kang. , Presented in the 6th International Indoor Air Quality,
Ventilation and Energy Conservation in Buildings Conference (IAQVEC 2007), |
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Zhuang
Z., Li Y.
and Chen B., A mathematical model for a house with an elevated Chinese kang
heating system, Presented in Building Simulation 2007, the 10th |
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Researcher
: Zuo L |
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List of Research Outputs |
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Zuo L.,
A statistical study on incipient plasticity of metals, Ph.D. Thesis.
Hong Kong, The |
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