DEPT OF MECHANICAL ENGG



Researcher : Afrin N

List of Research Outputs

Afrin N. and Ngan A.H.W., Creep of micron-sized Ni3Al columns, Scripta Materialia. Elsevier, 2006, 54: 7-12.
Afrin N., M.Phil. Thesis, An Investigation of Deformation Behaviour and Creep Properties of Micron Sized Ni3Al Columns. Hong Kong, The University of Hong Kong, 2006, 1-240.


Researcher : Bai Y

List of Research Outputs

Bai Y., Ng C.O. and Huang T., A numerical study on the structure and dynamics of turbulence in oscillatory bottom layer flow over a flat or rippled bed, China Ocean Engineering. Beijing, China, China Ocean Press, 2006, 20(1): 45-60.
Bai Y., Xu H., Xu D. and Ng C.O., Nonlinear dynamical characteristics of bed load motion, Science in China: Series E Technological Sciences. Beijing, China, Science in China Press, 2006, 49(3): 365-384.


Researcher : Bakountouzis LN

Project Title:Decompression of diesel engines in ship propulsion
Investigator(s):Bakountouzis LN
Department:Mechanical Engg
Source(s) of Funding:University Research Committee / Committee on Research and Conference Grants - General Award
Start Date:12/1987
Completion Date:08/2005
Abstract:
To investigate theoretically the reduction in the stopping and reversing time of a diesel engine used in ship propulsion and the subsequent reduction in the stopping distance of a ship; to develop a special decompression valve and associated control equipment whereby cylinder contents can be emptied at the right instant during the cycle, thus affecting the braking effect on the engine; to correlate theoretical and experimental results.


Project Title:Petrol engine fuel quality requirements
Investigator(s):Bakountouzis LN
Department:Mechanical Engg
Source(s) of Funding:University Research Committee / Committee on Research and Conference Grants - General Award
Start Date:07/1992
Abstract:
To investigate the effect of the quality of present-day fuels, available in Hong Kong, on the performance of typical petrol engines; to establish the requirements for a safe margin of protection against detonation and to quantify the loss of performance incurred, for the same protection, for a range of engines/fuels.


List of Research Outputs



Researcher : Chan ATY

Project Title:Strategic guidelines for future development to achieve sustainable air quality in urban areas
Investigator(s):Chan ATY
Department:Mechanical Engg
Source(s) of Funding:Other Funding Scheme
Start Date:09/1999
Abstract:
To develop a list of comprehensive strategic planning and development guidelines for urban area development in order to achieve sustainable air quality in Hong Kong.


Project Title:Evaluation of air pollution indication system in Hong Kong
Investigator(s):Chan ATY
Department:Mechanical Engg
Source(s) of Funding:Pollution Studies in Hong Kong
Start Date:01/2000
Abstract:
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.


Project Title:Indoor/outdoor air quality relationships of respirable suspended particulates, nitrogen oxides and carbon monoxides in urban buildings
Investigator(s):Chan ATY, Li Y
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:09/2003
Abstract:
To investigate experimentally and computationally indoor-outdoor (IO) relationships in buildings and to develop semi-empirical models for various situations.


Project Title:Indoor/outdoor air quality relationships of respirable suspended particulates, nitrogen oxides and carbon monoxides in urban buildings
Investigator(s):Chan ATY, Li Y
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:09/2003
Abstract:
N/A


Project Title:Correlation between urban morphological attributes and air pollution in urban areas in Hong Kong
Investigator(s):Chan ATY
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:09/2004
Abstract:
To identify the urban morphological attributes that are responsible for air pollution in urban areas through analytical and experimental investigation.


Project Title:Correlation between urban morphological attributes and air pollution in urban areas in Hong Kong
Investigator(s):Chan ATY
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2005
Completion Date:12/2006
Abstract:
N/A


Project Title:Study of carbon fibres and their applications in domestic electrical appliances
Investigator(s):Chan ATY, Cheung DHK, Cheung KC, Tse TH
Department:Mechanical Engg
Source(s) of Funding:Matching Grant for Joint Research
Start Date:05/2005
Completion Date:08/2006
Abstract:
Carbon fibres are electrical conductors with electrical, mechanical and thermal properties very different from that of a traditional metallic or alloy conductor. By corretly dopting it with impurities, the properties of carbon fibre may be altered to suit specific appliction requirement as heating elements in domestic applicances. The following body of knowledge is requried to systematically apply the material to consumer product applications: relationship between the physical and chemical composition of the carbon fibres and its electrical, mechanical and thermal properties; the electrical, mechanical and thermal properties of "carbon-fibre based" materials such as thin film and emulsion. The university is in the position to provide the know-how and research facilities to collect and compile the said body of knowledge which will allow the applicant company to apply it the design of new types of key components in domestic electrical applicances to improve their performances and thus provide the necessary competitive edge in the international marketplace.


Project Title:Effects of trees on urban microclimate and air quality in Hong Kong
Investigator(s):Chan ATY
Department:Mechanical Engg
Source(s) of Funding:Incentive Award for RGC CERG Fundable But Not Funded Projects
Start Date:07/2005
Completion Date:06/2006
Abstract:
N/A


List of Research Outputs

Chan A.T.Y., Chau K.W., Wong S.K. and Lam S.K., Air Quality And Property Prices In High Density Urban Areas, Proceedings of the 6th International Conference on Tall Buildings. Hong Kong, 2005, 859-864.
Chan A.T.Y., Best teacher award, Faculty of Engineering, The University of Hong Kong. 2005.
Chau K.W., Wong S.K., Chan A.T.Y. and Lam S.K., 2006 Best Refereed Paper Award, Pacific Rim Real Estate Society. 2006.
Chau K.W., Wong S.K., Chan A.T.Y. and Lam S.K., How do people price air quality: empirical evidence from Hong Kong, 12th Pacific Rim Real Estate Society (PRRES) Conference. Auckland, New Zealand, 2006.
Edussuriya P.S., Ye A.M. and Chan A.T.Y., Air Quality and High-rise High-density Residential Environment in Hong Kong, In: K Y Cheung and K W Chau, Proceedings: Sixth International Conference on Tall Buildings. Hong Kong, The University of Hong Kong, 2005, 942-920.
Edussuriya P.S., Ye A.M. and Chan A.T.Y., Building Density And Air Quality In Sub-tropical Urban Environment Of Hong Kong, Proceedings: 2nd Conference For Architectural Design And Technologies For Pan Sub-tropical Climates. 第二屆泛亞熱帶建築設計與技術學術會議, Guangzhou, China, South China University of Technology, 2005, 85-95.
Edussuriya P.S., Ye A.M. and Chan A.T.Y., Urban form and air quality: understanding air pollutant movement in residential environment in Hong Kong, Proceedings: the 39th Architectural Science Association Conference. New Zealand, Victoria University of Wellington, 2005, 1-8.


Researcher : Chan BP

Project Title:Photochemical crosslinking (PC) technology in fabrication of collagen-based scaffolds for tissue engineering
Investigator(s):Chan BP
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:02/2004
Abstract:
To develop an innovative photochemical crosslinking technology, which is the light activation of a photosensitizing compound leading to the crosslinking of collagen.


Project Title:Tissue engineering of nerve conduits with improved features using photochemically crosslinked collagen for nerve regeneration
Investigator(s):Chan BP, So KF
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:01/2005
Completion Date:06/2006
Abstract:
To engineer a biocompatible nerve conduit that is comparable with or better than the clinical gold standard autograft in promoting nerve regeneration using a peripheral nerve regeneration model.


Project Title:A novel photochemically crosslinked collagen scaffold for intervertebral disc replacement
Investigator(s):Chan BP
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:10/2005
Abstract:
N/A


Project Title:A novel photochemically crosslinked collagen scaffold for intervertebral disc replacement
Investigator(s):Chan BP, Cheung KMC, Lu WW, Wang M, Chan D, Luk KDK, So KF
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:10/2005
Abstract:
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).


Project Title:Stem cell encapsulation in collagen microspheres – A platform technology for 3D cultures and cell delivery
Investigator(s):Chan BP, Chan GCF
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:01/2006
Abstract:
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.


List of Research Outputs

Chan B.P., Leung M.K.H., Yeung C.W., Li J., Mo I. and Chan G.C.F., A novel 3-dimensiona culture system for human mesenchymal stem cells, International Society for Stem Cell Research 4th Annual Meeting. Toronto, Ontario, Canada, 2006, 98.
Chan B.P. and So K.F., Modification of the physicochemical properties and microstructures of collagen scaffolds using photochemical crosslinking, Tissue Engineering. May Ann Liebut, Inc., 2005, 1016-1017.
Chan B.P. and So K.F., Photochemical crosslinking affects the microstructure of porous collaten scaffolds, Tissue Engineering. May Ann Liebut, Inc., 2005, 1070.
Chan B.P., Hui T.Y., Chan C.M., So K.F., Lu W.W., Cheung K.M.C., Salomatina E. and Yaroslavsky A., Photochemical crosslinking for collagen-based scaffolds - A study on optical properties, mechanical properties, stablility and haematocompatibility, Tissue Engineering. USA, Mary Ann Liebert, Inc., 2006.
Chan B.P. and So K.F., Photochemical crosslinking improves the physicochemical properties of collagen scaffolds, Journal of Biomedical Materials Research. 2005, 75A Issue 3: 689-701.
Chan B.P., Fu S.C., Qin L., Rolf C. and Chan K.M., Supplementation-time dependence of growth factors in promoting tendon healing, Clinical Orthopadics and Related Research. Lippincott Williams & Wilkins, 2005, 448: 240-247.
Chan C.M., So K.F. and Chan B.P., Photochemical crosslinking reduces the intrinsic thrombogenicity of collagen membrances in vitro, Tissue Engineering. May Ann Liebut, Inc., 2005, 1087.
Hui T.Y., Ho G., Cheung K.M.C., Chan D., Cheung W.L. and Chan B.P., Rabbit bone marrow derived mesenchymal stem cells induced collagen gel contraction-fabrication of tissue-like structures with different cell densities, Tissue Engineering. May Ann Liebut, Inc., 2005, 110.
Yu R.M.K., Lin C.C., Chan P.K., Chow E.S.H., Murphy M.B., Chan B.P., Müller F., Strähle U. and Cheng S.H., Four-dimensional imaging and quantification of gene expression in early developing zebrafish (Danio rerio) embryos, Toxicological Sciences. Oxford University Press, 2006, 90(2): 529-538.


Researcher : Chan CF

List of Research Outputs

Chan C.F. and Chan K.W., Computer-aided design and manufacturing of tactile maps, Proceedings of the 16th International Conference on Flexible Automation and Intelligent Manufacturing. Limerick, Ireland, University of Limerick, 2006, 2: 703-710.
Chan C.F., Chan K.W. and Lai P.C., THE PROGRESSIVE EMBOSSING SYSTEM – a prototype computer-driven servo-motor and pneumatic based tactile map drafting machine with two embossing modes, 2006.


Researcher : Chan CF

List of Research Outputs

Chan C.F. and Chan K.W., Computer-aided design and manufacturing of tactile maps, Proceedings of the 16th International Conference on Flexible Automation and Intelligent Manufacturing. Limerick, Ireland, University of Limerick, 2006, 2: 703-710.
Chan C.F., Chan K.W. and Lai P.C., THE PROGRESSIVE EMBOSSING SYSTEM – a prototype computer-driven servo-motor and pneumatic based tactile map drafting machine with two embossing modes, 2006.


Researcher : Chan CK

List of Research Outputs

Chan C.K. and Tan S.T., Volume decomposition of CAD models for rapid prototyping technology, Rapid Prototyping Journal. Emerald Group Publishing Limitd, 2005, 11(4): 221-234.


Researcher : Chan CM

List of Research Outputs

Chan B.P., Hui T.Y., Chan C.M., So K.F., Lu W.W., Cheung K.M.C., Salomatina E. and Yaroslavsky A., Photochemical crosslinking for collagen-based scaffolds - A study on optical properties, mechanical properties, stablility and haematocompatibility, Tissue Engineering. USA, Mary Ann Liebert, Inc., 2006.
Chan C.M., So K.F. and Chan B.P., Photochemical crosslinking reduces the intrinsic thrombogenicity of collagen membrances in vitro, Tissue Engineering. May Ann Liebut, Inc., 2005, 1087.


Researcher : Chan CW

Project Title:A unified framework for the compensation of memoryless actuator nonlinearity in feedback control
Investigator(s):Chan CW
Department:Mechanical Engg
Source(s) of Funding:Small Project Funding
Start Date:11/2003
Abstract:
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.


Project Title:Fault accommodation for nonlinear systems with unknown dynamics
Investigator(s):Chan CW
Department:Mechanical Engg
Source(s) of Funding:Incentive Award for RGC CERG Fundable But Not Funded Projects
Start Date:07/2005
Completion Date:06/2006
Abstract:
N/A


Project Title:A time series approach to detect the transcriptional start sites of genes
Investigator(s):Chan CW
Department:Mechanical Engg
Source(s) of Funding:Small Project Funding
Start Date:01/2006
Abstract:
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.


Project Title:Installation of wave suppressor in the Victoria Harbour
Investigator(s):Chan CW
Department:Mechanical Engg
Source(s) of Funding:Utility Information Ltd.
Start Date:06/2006
Abstract:
To study the installation of wave suppressor in the Victoria Harbour.


List of Research Outputs



Researcher : Chan KW

Project Title:Computer-aided mould design and manufacture of thermoformed PVC sheets
Investigator(s):Chan KW
Department:Mechanical Engg
Source(s) of Funding:Other Funding Scheme
Start Date:01/2002
Abstract:
To develop a computer-aided design and manufacturing process for producing thermoformed PVC sheets for packaging purpose.


Project Title:A new method of generating milling tool path programs
Investigator(s):Chan KW
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:12/2003
Completion Date:12/2005
Abstract:
To reduce and stabilise cutting load in milling operation by applying computational techniques to isolate the concave corners of a machining region, thereby forming a major region and a number of disjoint sub-regions.


Project Title:A new method of generating milling tool path programs
Investigator(s):Chan KW
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:12/2003
Abstract:
N/A


List of Research Outputs

Chan C.F. and Chan K.W., Computer-aided design and manufacturing of tactile maps, Proceedings of the 16th International Conference on Flexible Automation and Intelligent Manufacturing. Limerick, Ireland, University of Limerick, 2006, 2: 703-710.
Chan C.F., Chan K.W. and Lai P.C., THE PROGRESSIVE EMBOSSING SYSTEM – a prototype computer-driven servo-motor and pneumatic based tactile map drafting machine with two embossing modes, 2006.


Researcher : Chang STC

List of Research Outputs

Chang S.T.C., PhD Thesis, Randomization of Recrystallization Textures in an Experimental A1-5%Mg Alloy and AA6111. Hong Kong, The University of Hong Kong, 2005, 1-367.
Chang S.T.C., Yeung A.S.C. and Duggan B.J., Producing a random recrystallization texture in 6111 aluminum alloy, Proceedigns of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 1): 591-596.


Researcher : Chen K

Project Title:Investigating the fabrication method for components made of multiphase perfect materials
Investigator(s):Chen KZ
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:02/2004
Completion Date:07/2005
Abstract:
To develop an effective fabrication method for components made of multiphase perfect materials by mean of virtual prototyping.


Project Title:Virtual component modelling for components made of a multiphase perfect material
Investigator(s):Chen KZ
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:02/2005
Abstract:
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.


Project Title:Virtual manufacturing for objects made of a multiphase perfect material
Investigator(s):Chen KZ
Department:Mechanical Engg
Source(s) of Funding:Incentive Award for RGC CERG Fundable But Not Funded Projects
Start Date:07/2005
Completion Date:06/2006
Abstract:
N/A


List of Research Outputs



Researcher : Chen KZ

Project Title:Investigating the fabrication method for components made of multiphase perfect materials
Investigator(s):Chen KZ
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:02/2004
Completion Date:07/2005
Abstract:
To develop an effective fabrication method for components made of multiphase perfect materials by mean of virtual prototyping.


Project Title:Virtual component modelling for components made of a multiphase perfect material
Investigator(s):Chen KZ
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:02/2005
Abstract:
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.


Project Title:Virtual manufacturing for objects made of a multiphase perfect material
Investigator(s):Chen KZ
Department:Mechanical Engg
Source(s) of Funding:Incentive Award for RGC CERG Fundable But Not Funded Projects
Start Date:07/2005
Completion Date:06/2006
Abstract:
N/A


List of Research Outputs

Chen K.Z., Feng X.A. and Chen X.C., Gene engineering-based innovation of manufactured products, In: Hoda A. ElMaraghy and Waguih H. WIMaraghy, Advances in Design. London, UK, Springer, 2006, 133-144.
Chen K.Z., Zhang X.W., Ou Z.Y. and Feng X.A., Holo-extraction and intelligent recognition of digital curves scanned from paper drawings, In: Muhammad Sarfraz, Computer Aided Intelligent Recognition Techniques and Applications. Chichester, England, John Wiley & Sons, 2005, 363-388.
Wang F., Chen K.Z., Feng X.Y. and Feng X.A., Optimization of the spraying process for multiphase perfect materials by means of virtual manufacturing, In: Cranfield University, U.K., Proceedings of International Conference of Manufacturing Research. 2005, C3-6.
Zhang X., Chen K.Z. and Feng X.A., A new design method for components made of a multiphase perfect material, In: Cranfield University, U.K., Proceedings of International Conference of Manufacturing Research. 2005, B3-6.
Zhu F., Chen K.Z. and Feng X.A., Visualized CAD models of objects made of a multiphase perfect material, Advances in Engineering Software. Oxford, UK, Elsevier Science, 2006, 37: 20-31.


Researcher : Chen QZ

List of Research Outputs

Duggan B.J., Quadir M.Z., Chen Q.Z., Shen K. and Tse Y.Y., Origin of the deformation microstructure in IF steel after medium cold rolling reductions, Proceedings of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 2): 1085-1090.


Researcher : Chen YH

Project Title:Haptic sculpting of computer generated holography (CGH) for conceptual design
Investigator(s):Chen YH
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:11/2002
Completion Date:10/2006
Abstract:
This project will investigate some major issues in developing a 3D haptic interaction system based on Computer Generated Holography (CGH). CGH is the only 3D display technology supplying the 3d depth cues used by human visual system. The study will look into 3 major issues: 1) developing data reduction schemes for CGH visualization; 2) building a simplied dynamic model for the interaction between a haptic device and a 3d solid model; and 3) the volumetric models from haptic sculpting will be converted to StereoLithography (STL) files from which physical prototypes can be built using rapid prototyping techniques.


Project Title:Haptic interacting and editing of heterogeneous objects in computer aided systems
Investigator(s):Chen YH
Department:Mechanical Engg
Source(s) of Funding:Incentive Award for RGC CERG Fundable But Not Funded Projects
Start Date:07/2004
Completion Date:07/2005
Abstract:
N/A


Project Title:Haptic modelling and filtering in reverse engineering model refinement
Investigator(s):Chen YH
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:01/2005
Abstract:
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.


Project Title:Interactive Haptic Shape Modeling of Heterogeneous Objects
Investigator(s):Chen YH
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:11/2005
Abstract:
N/A


Project Title:Interactive Haptic Shape Modeling of Heterogeneous Objects
Investigator(s):Chen YH
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:11/2005
Abstract:
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.


List of Research Outputs



Researcher : Cheung KC

Project Title:A study on the use of fuel cells as replacement for lead-acid batteries in solar-based electrical power generation
Investigator(s):Cheung KC
Department:Mechanical Engg
Source(s) of Funding:Low Budget High Impact Programme
Start Date:11/2001
Abstract:
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.


Project Title:A study on solar-powered water electrolysis for hydrogen production
Investigator(s):Cheung KC
Department:Mechanical Engg
Source(s) of Funding:Small Project Funding
Start Date:11/2002
Abstract:
To study the use of solar panels to generate electrical power for water electrolysis.


List of Research Outputs



Researcher : Cheung WL

Project Title:Laser energy absorption properties of polymer based composite powders for selective laser sintering
Investigator(s):Cheung WL, Gibson I
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:09/2003
Completion Date:09/2005
Abstract:
To study relations between the characteristics of existing single polymer powders and the laser absorption properties of the powder bed; to study the effects of glass micro-spheres with different surface treatments, on the laser energy absorption properties; to carry out theoretical modelling of the laser energy absorption coefficient of the powder bed; to study sintering behaviours of the different powder systems and correlating the sintering behaviours with the energy absorption and rheological properties of the materials.


Project Title:Laser energy absorption properties of polymer based composite powders for selective laser sintering
Investigator(s):Cheung WL, Gibson I
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:09/2003
Abstract:
N/A


Project Title:Fatigue properties of high density polyethylene fibre reinforced edentulous dentures
Investigator(s):Cheung WL, Chow TW, Cheng YY
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:03/2005
Completion Date:03/2006
Abstract:
(1) To analyse the stress distribution in maxillary and mandibular edentulous dentures using finite element analysis. (2) To develop a technology for incorporating high density polyethylene(HDPE) fibres into the dentures for reinforcement purpose. (3) To study the mechanical properties of both the non-reinforced and reinforced denture base materials and to determine the optimal volume fraction and location of the HDPE fibres for improved fatigue properties of the complete dentures.


Project Title:Selective Laser Sintering of Porous Biopolymer/Biocomposite Scaffolds for Bone Tissue Engineering
Investigator(s):Cheung WL
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:09/2005
Abstract:
N/A


List of Research Outputs

Fan K.M., Cheung W.L. and Gibson I., Movement of powder bed material during the selective laser sintering of bisphenol-A polycarbonate, Rapid Prototyping Journal. Bradford, U.K., Emerald Group Publishing Limited, 2005, 11: 188-198.
Gibson I., Cheung L.K., Chow S.P., Cheung W.L., Beh S.L., Savalani M.M. and Lee S.H., The Use Of Rapid Prototyping To Assist Medical Applications, Rapid Prototyping Journal. UK, Emerald Group Publishing Ltd., 2006, 12: 53-58.
Hui T.Y., Ho G., Cheung K.M.C., Chan D., Cheung W.L. and Chan B.P., Rabbit bone marrow derived mesenchymal stem cells induced collagen gel contraction-fabrication of tissue-like structures with different cell densities, Tissue Engineering. May Ann Liebut, Inc., 2005, 110.
Zhou W., Wang M. and Cheung W.L., Nanoemulsion synthesis of carbonated hydroxyapatite nanospheres for tissue engineering applications, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The University of Hong Kong, 2005, 166.
Zhou W., Wang M. and Cheung W.L., Synthesis of nanospheres of carbonated hydroxyapatite by nanoprecipitation, Proceedings of the 3rd International Symposium on Apatite and Correlative Biomaterials. China, Wuhan University of Technology, 2005, 107.


Researcher : Ching WH

List of Research Outputs

Li Y., Ching W.H., Qian H. and Yuen P.L., Performance of air-conditioning systems in sars negative pressure isolation rooms, Proceedings of Asian Conference on Refrigeration and Air-conditioning ACRA. Gyeongju, Korea, 2006, 1: 213-220.


Researcher : Chow KW

Project Title:The dynamics and propagation of nonlinear waves in interacting wavepackets systems
Investigator(s):Chow KW, Grimshaw R.H.J.
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:11/2002
Completion Date:04/2006
Abstract:
The project attempts to understand the dynamics and propagation of weakly nonlinear wavepackets in physical and engineering systems. In particular, the focus is on the case where there are two or more modes of waveguides in the system. Simple dynamical models in fluid dynamics and optics will be employed as examples.


Project Title:Periodic patterns in coupled hydrodynamical and optical waveguides
Investigator(s):Chow KW
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2005
Abstract:
N/A


Project Title:Periodic patterns in coupled hydrodynamical and optical waveguides
Investigator(s):Chow KW, Conte R.M.J.
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
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2006
Abstract:
N/A


Project Title:Nonlinear localized modes and their dynamics: applications in hydrodynamics and optics
Investigator(s):Chow KW, Rogers C, Guararie D
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

Chow K.W. and Mak C.C., A simple model for the two dimensional blood flow in the collapse of veins, Journal of Mathematical Biology. 2006, 52: 733-744.
Chow K.W., Conte R. and Xu N., Analytic doubly periodic wave patterns for the integrable discrete nonlinear Schrodinger (Ablowitz-Ladik) model , Physics Letters A. 2006, 344: 422-429.
Chow K.W., Mak C.C., Rogers C. and Schief W., Doubly-periodic and multiple pole solutions of the sinh-Poisson equation: Application of reciprocal transformations in subsonic gas dynamics, Journal of Computational and Applied Mathematics. 2006, 190: 114-126.
Chow K.W., Malomed B.A. and Nakkeeran K., Exact solitary- and periodic-wave modes in coupled equations with saturable nonlinearity, Physics Letters A. 2006, 359: 37 - 41.
Chow K.W., Grimshaw R.H.J. and Ding E., Interactions of breathers and solitons in the extended Korteweg – de Vries equation, Wave Motion. 2005, 43: 158 - 166.
Chow K.W. and Lou S.Y., Propagating wave patterns and ''peakons'' of the Davey-Stewartson system, Chaos, Solitons and Fractals. 2006, 27: 561-567.
Chow K.W., Zhang D. and Poon C.K., Three dimensional wave for water waves on finite depth:the Davey - Stewartson system, In: A. T. Chwang, M. H. Teng, D. T. Valentine, Advances in Engineering Mechanics: Reflections and Outlooks - in Honour of Professor Y. T. Wu. World Scientific, 2006, 111 - 116.
Chow K.W., Vortex dynamics of two dimensional, inviscid fluids: vortex arrays and stability, Mechanical Engineering Seminar, Hong Kong Polytechnic University. 2005.
Ling H.Y., Lau K.T., Cheng L. and Chow K.W., Embedded fiber Bragg grating sensors for non-uniform strain sensing in composite structures, Measurement Science and Technology. 2005, 16: 2415 - 2424.
Shek C.M., Grimshaw R.H.J., Ding E. and Chow K.W., Interactions of breathers and solitons of the extended Korteweg - de Vries equation, The 58th American Physical Society Division of Fluid Dynamics Meeting, Chicago, Illinois, USA. 2005.
Tang X.Y., Chow K.W. and Lou S.Y., Some novel nonlinear coherent excitations of the Davey-Stewartson system, Journal of Physics A. 2005, 38: 10361 - 10375.


Researcher : Chwang ATY

Project Title:Unsteady free-surface far wake generated by a body moving in a viscous fluid
Investigator(s):Chwang ATY
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:12/2002
Completion Date:11/2005
Abstract:
This research is to develop analytical models for the generation, dispersion and dissipation of the unsteady, viscous free-surface far wake. These solutions may be employed as foundations to obtain solutions for other systems of practical importance such as the interaction of these wakes created by several moving bodies.


Project Title:An investigation of hydrodynamic interaction between two bodies
Investigator(s):Chwang ATY, Ren S.
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:11/2003
Completion Date:10/2006
Abstract:
To conduct research analytically as well as numerically on the hydrodynamic interaction between two immersed bodies involving translation, rotation and vibration. Fundamental solutions for three-dimensional non-spherical bodies will be derived by means of transformations of harmonics between two corresponding coordinate systems. Properties and dynamic behavior of a two-body system will be determined by solving the dynamical equations of motion. Experimental verification of some basic analytical and numerical results on the trajectories of floating bodies will also be conducted.


Project Title:An investigation of hydrodynamic interaction between two bodies
Investigator(s):Chwang ATY, Ren S.
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:11/2003
Abstract:
N/A


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):Chwang ATY
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2006
Abstract:
N/A


Project Title:Fundamental Study of Nanofluids in Nanochannels of Various Shapes
Investigator(s):Chwang ATY, 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.


List of Research Outputs

Chwang A.T.Y., Teng M.H. and Valentine D.T., Advances in Engineering Mechanics Reflections and Outlooks - In Honor of Theodore Y-T Wu. Singapore, World Scientific Publishing Co. Pte. Ltd., 2005, 1-730.
Chwang A.T.Y., Associate Editor, International Journal of Offshore and Polar Engineering. 2006.
Chwang A.T.Y., Member of the Advisory Board, Journal of Hydrodynamics. 2006.
Chwang A.T.Y., Member of the Advisory Board, Theoretical and Computational Fluid Dynamics. 2006.
Chwang A.T.Y., Member of the Editorial Board, China Ocean Engineering. 2006.
Chwang A.T.Y., Member of the Editorial Board, Journal of Marine Science and Technology. 2006.
Chwang A.T.Y., Member of the Editorial Board, Journal of Mechanical Engineering Science. 2006.
Chwang A.T.Y., Member of the Editorial Board, Wave Motion. 2006.
Deng L. and Chwang A.T.Y., Transverse waves in a channel with rectangular cross section, In: Allen T Chwang, Michelle H Teng & Daniel T Valentine, Advances in Engineering Mechanics Reflections and Outlooks - In Honor of Theodore Y-T Wu. Singapore, World Scientific Publishing Co. Pte. Ltd., 2005, 239-246.
Huang L., Ng C.O. and Chwang A.T.Y., A Fourier-Chebyshev collocation method for the mass transport in a layer of power-law fluid mud, Computer Methods in Applied Mechanics and Engineering. Oxford, UK, Elsevier Science Ltd, 2006, 195(9-12): 1136-1153.
Huang L., Ng C.O. and Chwang A.T.Y., A spectral method for the mass transport in a layer of power-law fluid under periodic forcing, In: Allen T Chwang, Michelle H Teng & Daniel T Valentine, Advances in Engineering Mechanics — Reflections and Outlooks: in Honor of Theodore Y-T Wu. Singapore, World Scientific, 2005, 633-650.
Huang L., Ng C.O. and Chwang A.T.Y., Spectral method applied to mass transport due to standing waves in water over non-Newtonian mud, Proceedings of the Sixteenth (2006) International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. California, USA, ISOPE, 2006, 552-559.
Lau E.O.Y., Tse H.F., Chan R.H.W., Chen W.H., Lee P.Y., Lee S.W.L., Chwang A.T.Y. and Lau C.P., Prediction of aortic augmentation index using radial pulse transmission-wave analysis, Journal of Hypertension. Lippincott Williams & Wilkins, 2006, 24(4): 723-730.
Liao S., Su J. and Chwang A.T.Y., Series solutions for a nonlinear model of combined convective and radiative cooling of a spherical body, International Journal of Heat & Mass Transfer. Elsevier Ltd., 2006, 49: 2437-2445.
Lu D. and Chwang A.T.Y., Interfacial waves due to a singularity in a system of two semi-infinite fluids, Physics of Fluids. American Institute of Physics, 2005, 17: 102107-1-9.
Lu D. and Chwang A.T.Y., Unsteady interaction between viscous far wakes and a free surface due to a two-dimensional submerged body, In: Ed. G.P. Miao and R.C. Zhu, Proceedings of the 3rd Asia-Pacific Workshop on Marine Hydrodynamics. Shanghai, China, 2006, 310-314.
Qian H., Li Y., Nielsen P.V., Hyldgaard C.E., Wong T.W. and Chwang A.T.Y., Dispersion of exhaled droplet nuclei in a two-bed hospital ward with three different ventilation systems, Indoor Air. Blackwell Munksgaard, 2006, 16: 111-128.
Su J. and Chwang A.T.Y., Estimation of the heat transfer coefficient of cryogenic spray cooling, Proceedings of the 18th International Congress of Mechanical Engineering (COBEM 2005). Ouro Preto, MG, Brazil, ABCM, 2005, CD-ROM: 8pp.
Su J. and Chwang A.T.Y., Exact analytical solution of stratified three-phase laminar flow in a horizontal rectangular duct, Proceedings of the 18th International Congress of Mechanical Engineering (COBEM 2005). Ouro Preto, MG, Brazil, ABCM, 2005, CD-ROM: 8pp.
Sun R. and Chwang A.T.Y., Hydrodynamic interaction between a prolate spheroid and a sphere, Structural Control and Health Monitoring. John Wiley & Sons, Ltd., 2006, 13(1): 147-168.
Sun R. and Chwang A.T.Y., The cohesion and re-separation of particles in slow viscous flows, In: Allen T Chwang, Michelle H Teng & Daniel T Valentine, Advances in Engineering Mechanics Reflections and Outlooks - In Honor of Theodore Y-T Wu. Singapore, World Scientific Publishing Co. Pte. Ltd., 2005, 651-659.
Wong L.H., Zhao Y., Chen G. and Chwang A.T.Y., Grooving the carbon nanotube oscillators, Applied Physics Letters. 2006, 88: 183107-1 to 183107-3.
Yu X. and Chwang A.T.Y., Computational simulation on flows in stenosed carotid arteries, Proceedings of the Second Asian Pacific Conference on Biomechanics (APB-2005). 2005, CD-ROM: 2pp.
Zhao Y., Ma C.C., Wong L.H., Chen G., Xu Z.P., Zheng Q.S., Jiang Q. and Chwang A.T.Y., Energy Exchanges in Carbon Nanotube Oscillators, Nanotechnology. UK, Institute of Physics Publishing, 2006, 17: 1032-1035.


Researcher : Deng L

List of Research Outputs

Deng L., PhD Thesis, A Study of Transverse Waves. Hong Kong, The University of Hong Kong, 2005, 1-120.
Deng L. and Chwang A.T.Y., Transverse waves in a channel with rectangular cross section, In: Allen T Chwang, Michelle H Teng & Daniel T Valentine, Advances in Engineering Mechanics Reflections and Outlooks - In Honor of Theodore Y-T Wu. Singapore, World Scientific Publishing Co. Pte. Ltd., 2005, 239-246.


Researcher : Deng L

List of Research Outputs

Deng L., PhD Thesis, A Study of Transverse Waves. Hong Kong, The University of Hong Kong, 2005, 1-120.
Deng L. and Chwang A.T.Y., Transverse waves in a channel with rectangular cross section, In: Allen T Chwang, Michelle H Teng & Daniel T Valentine, Advances in Engineering Mechanics Reflections and Outlooks - In Honor of Theodore Y-T Wu. Singapore, World Scientific Publishing Co. Pte. Ltd., 2005, 239-246.


Researcher : Ding E

List of Research Outputs

Chow K.W., Grimshaw R.H.J. and Ding E., Interactions of breathers and solitons in the extended Korteweg – de Vries equation, Wave Motion. 2005, 43: 158 - 166.


Researcher : Duggan BJ

Project Title:The plastic formability of alloys of the magnesium-lithium family; a preliminary in investigation involving alloy development, thermo-mechanical processing and characterisation
Investigator(s):Duggan BJ, Chen QZ, Xu Y.B.
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:11/2002
Completion Date:12/2005
Abstract:
The project is to try to develop two families of alloys based on magnesium and lithium which present knowledge indicates could make a useful characteristics capable of being used in motor cars. The goals are to make a useful superplastic alloy based on the hexagonal atomic packing structure and a material based on the body centred cubic structures which has good drawability. In both cases the form of the final product will be thin sheet metal that can be used in pressing desired shapes from a blank.


Project Title:The formation of secondary recrystallisation texture in Fe-3% Si
Investigator(s):Duggan BJ, Penelle R.
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:07/2003
Completion Date:06/2006
Abstract:
To investigate by transmission and high resolution scanning electron microscopy, the processes by which the Goss Texture, {110}<001> is formed in Fe-3% Si during secondary recrystallisation.


Project Title:The formation of secondary recrystallisation texture in Fe-3% Si
Investigator(s):Duggan BJ, Penelle R.
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:07/2003
Abstract:
N/A


List of Research Outputs

Chang S.T.C., Yeung A.S.C. and Duggan B.J., Producing a random recrystallization texture in 6111 aluminum alloy, Proceedigns of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 1): 591-596.
Duggan B.J., Shen G. and Xu Y.B., Deformation and recrystallisation of BCC Mg LI, Proceedings of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 1): 699-704.
Duggan B.J., Quadir M.Z., Chen Q.Z., Shen K. and Tse Y.Y., Origin of the deformation microstructure in IF steel after medium cold rolling reductions, Proceedings of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 2): 1085-1090.
Quadir M.Z. and Duggan B.J., Recrystallization texture and microstructure formation in heavily rolled IF steel, Proceedings of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 1): 489-494.
Tse Y.Y. and Duggan B.J., Orientation imaging microscopy studies of recrystallization in interstitial-free steel, Metallurgical and Materials Transactions A. 2006, 37A: 1055-1064.


Researcher : Fan KM

List of Research Outputs

Fan K.M., Cheung W.L. and Gibson I., Movement of powder bed material during the selective laser sintering of bisphenol-A polycarbonate, Rapid Prototyping Journal. Bradford, U.K., Emerald Group Publishing Limited, 2005, 11: 188-198.


Researcher : Gao Z

List of Research Outputs

Gao Z., PhD Thesis, Development of an Integrated Haptic Interface for Computer Aided Product Design. Hong Kong, The University of Hong Kong, 2005, 1-192.


Researcher : Gibson I

Project Title:Optimisation of DMD-based Micro-Stereolithography Technology
Investigator(s):Gibson I
Department:Mechanical Engg
Source(s) of Funding:Incentive Award for RGC CERG Fundable But Not Funded Projects
Start Date:07/2005
Completion Date:06/2006
Abstract:
N/A


List of Research Outputs

Chow S.P., Lam K.W., Gibson I., Ngan A.H.W., Lu W.W., Ip W.Y. and Chiu P.K.Y., A novel artificial prosthetic replacement for the proximal interphalangeal joint of the hand - From concept to prototype, Hand Surgery. 2005, 10(2&3): 159-168.
Fan K.M., Cheung W.L. and Gibson I., Movement of powder bed material during the selective laser sintering of bisphenol-A polycarbonate, Rapid Prototyping Journal. Bradford, U.K., Emerald Group Publishing Limited, 2005, 11: 188-198.
Gibson I., Cheung L.K., Chow S.P., Cheung W.L., Beh S.L., Savalani M.M. and Lee S.H., The Use Of Rapid Prototyping To Assist Medical Applications, Rapid Prototyping Journal. UK, Emerald Group Publishing Ltd., 2006, 12: 53-58.


Researcher : Guo Y

List of Research Outputs

Guo Y., PhD Thesis, Alkaline-Catalyzed Production of Biodiesel Fuel from Virgin Canola Oil and Recycled Waste Oils. Hong Kong, The University of Hong Kong, 2005, 1-185.
Leung Y.C., Koo B.C.P. and Guo Y., Degradation of biodiesel under different storage conditions, Bioresource Technology. Oxford, UK, Elsevier Ltd., 2006, 97: 250-256.


Researcher : He M

List of Research Outputs

He M. and Lam H.N., Study of geothermal seasonal cooling storage system with energy piles, Proceedings of ECOSTOCK Conference 2006, the Tenth International Conference on Thermal Energy Storage. New Jersey, U.S.A, 2006, 1-6.


Researcher : Hu R

List of Research Outputs

Hu R., Soh A.K., Zheng G. and Ni Y., Micromagnetic modeling studies on the effects of stress on magnetization reversal and dynamic hysteresis, Journal of Magnetism and Magnetic Materials. Amsterdam, Netherlands, Elsevier, 2006, 301(2): 458-468.


Researcher : Huang L

List of Research Outputs

Huang L., Ng C.O. and Chwang A.T.Y., A Fourier-Chebyshev collocation method for the mass transport in a layer of power-law fluid mud, Computer Methods in Applied Mechanics and Engineering. Oxford, UK, Elsevier Science Ltd, 2006, 195(9-12): 1136-1153.
Huang L., Ng C.O. and Chwang A.T.Y., A spectral method for the mass transport in a layer of power-law fluid under periodic forcing, In: Allen T Chwang, Michelle H Teng & Daniel T Valentine, Advances in Engineering Mechanics — Reflections and Outlooks: in Honor of Theodore Y-T Wu. Singapore, World Scientific, 2005, 633-650.
Huang L., Mass Transport due to Surface Waves in a Water-Mud System, Ph.D. Thesis. Hong Kong, HKU, 2005, 153 pp.
Huang L., Ng C.O. and Chwang A.T.Y., Spectral method applied to mass transport due to standing waves in water over non-Newtonian mud, Proceedings of the Sixteenth (2006) International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. California, USA, ISOPE, 2006, 552-559.


Researcher : Huang L

List of Research Outputs

Huang L., Ng C.O. and Chwang A.T.Y., A Fourier-Chebyshev collocation method for the mass transport in a layer of power-law fluid mud, Computer Methods in Applied Mechanics and Engineering. Oxford, UK, Elsevier Science Ltd, 2006, 195(9-12): 1136-1153.
Huang L., Ng C.O. and Chwang A.T.Y., A spectral method for the mass transport in a layer of power-law fluid under periodic forcing, In: Allen T Chwang, Michelle H Teng & Daniel T Valentine, Advances in Engineering Mechanics — Reflections and Outlooks: in Honor of Theodore Y-T Wu. Singapore, World Scientific, 2005, 633-650.
Huang L., Mass Transport due to Surface Waves in a Water-Mud System, Ph.D. Thesis. Hong Kong, HKU, 2005, 153 pp.
Huang L., Ng C.O. and Chwang A.T.Y., Spectral method applied to mass transport due to standing waves in water over non-Newtonian mud, Proceedings of the Sixteenth (2006) International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. California, USA, ISOPE, 2006, 552-559.


Researcher : Hui SCM

List of Research Outputs

Hui S.C.M., Analysis of climatic data for sustainable buildings in Hong Kong, Proceedings of the Second Conference for Architectural Design and Technologies for Pan Sub-tropical Climates. Guangzhou, China, School of Architecture, South China University of Technology, 2005, 70-78.
Hui S.C.M. and Tsang M.F., Climatic data for sustainable building design in Hong Kong, Proceedings of the Joint Symposium 2005: New Challenges in Building Services. Hong Kong, HKIE BS Division/CIBSE HK Branch/ASHRAE HK Chapter, 2005, 89-99.
Hui S.C.M. and Or G.K.C., Study of prefabricated building services components for residential buildings in Hong Kong, Proceedings of the Hubei-Hong Kong Joint Symposium 2005. Wuhan, China, HKIE BS Division/CIBSE HK Branch/ASHRAE HK Chapter, 88-97.
Hui S.C.M. and Kwok M.K., Study of thin films to enhance window performance in buildings, Proceedings of the Sichuan-Hong Kong Joint Symposium 2006. Chengdu, China, HKIE BS Division/ASHRAE HK Chapeter/CIBSE HK Branch, 157-167.


Researcher : Hui TY

List of Research Outputs

Chan B.P., Hui T.Y., Chan C.M., So K.F., Lu W.W., Cheung K.M.C., Salomatina E. and Yaroslavsky A., Photochemical crosslinking for collagen-based scaffolds - A study on optical properties, mechanical properties, stablility and haematocompatibility, Tissue Engineering. USA, Mary Ann Liebert, Inc., 2006.
Hui T.Y., Ho G., Cheung K.M.C., Chan D., Cheung W.L. and Chan B.P., Rabbit bone marrow derived mesenchymal stem cells induced collagen gel contraction-fabrication of tissue-like structures with different cell densities, Tissue Engineering. May Ann Liebut, Inc., 2005, 110.


Researcher : Kong Y

List of Research Outputs

Kong Y., PhD Thesis, Effects of Minor Alloying on the Microstructures and Creep Properties of RR2086. Hong Kong, The University of Hong Kong, 2005, 1-234.


Researcher : Kou X

List of Research Outputs

Kou X. and Tan S.T., Data structure and algorithms for virtual protoyping of heterogeneous objects, Computer-Aided Design & Applications. Phuket, Thailand, 2006, 3(1-4): 59-67.
Kou X., Tan S.T. and Sze W.S., Modeling complex heterogeneous objects with non-manifold heterogeneous cells, Computer-Aided Design. Elsevier Ltd., 2005, 38: 457-474.
Kou X., PhD Thesis, Computer-aided Design of Heterogeneous Objects. Hong Kong, The University of Hong Kong, 2005, 1-246.
Kou X., Tan S.T. and Sze W.S., Relation oriented modeling for heterogeneous object design, ASME 2005 International Design Engineering Technical Conference & Computers and Informaton in Engineering Conference. Long Beach, California, USA, ASME, 2005, CD-ROM: 6pp.


Researcher : Kou X

List of Research Outputs

Kou X. and Tan S.T., Data structure and algorithms for virtual protoyping of heterogeneous objects, Computer-Aided Design & Applications. Phuket, Thailand, 2006, 3(1-4): 59-67.
Kou X., Tan S.T. and Sze W.S., Modeling complex heterogeneous objects with non-manifold heterogeneous cells, Computer-Aided Design. Elsevier Ltd., 2005, 38: 457-474.
Kou X., PhD Thesis, Computer-aided Design of Heterogeneous Objects. Hong Kong, The University of Hong Kong, 2005, 1-246.
Kou X., Tan S.T. and Sze W.S., Relation oriented modeling for heterogeneous object design, ASME 2005 International Design Engineering Technical Conference & Computers and Informaton in Engineering Conference. Long Beach, California, USA, ASME, 2005, CD-ROM: 6pp.


Researcher : Lam HN

Project Title:Geothermal heat pump systems for central cooling and heating of buildings in Hong Kong
Investigator(s):Lam HN
Department:Mechanical Engg
Source(s) of Funding:Small Project Funding
Start Date:11/2003
Completion Date:10/2005
Abstract:
To investigate the detailed performance of a geothermal heat pump system for central cooling and heating of buildings under Hong Kong climatic conditions and to analyse the economic benefits and the potentials for enegy conservation and environmental protection.


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 OSH Enhancement Scheme for SMEs
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 50 m are drilled in the ground to accommodate the vertical heat exchanger pipes. Besides being costly, these bore hole drillings also impose a great demand for availability of land which is scarce in Hong Kong. An innovative approach to solve this problem is therefore proposed in which the concrete building foundation piles will be used to accommodate the vertical heat exchanger pipes. Since most buildings in Hong Kong are high-rise buildings, the foundation piles are deeper and more piles are needed to ensure structural rigidity. In view of this, the potential of using the foundation piles for dissipation of heat to the ground from the embedded heat exchanger pipes is expected to be high.


List of Research Outputs

He M. and Lam H.N., Study of geothermal seasonal cooling storage system with energy piles, Proceedings of ECOSTOCK Conference 2006, the Tenth International Conference on Thermal Energy Storage. New Jersey, U.S.A, 2006, 1-6.
Jie J. and Lam H.N., The influence of the support frame on the annual electric and thermal performance of a PV-wall in Hong Kong, Journal of Energy & Environment. 2006, 5: 1-15.
Leung M.K.H., Leung Y.C. and Lam H.N., Integrated heat pump for high energy efficiency, Proceedings of the 2nd International Conference on Energy Efficiency and Conservation. Hong Kong, Intercontinental Grand Stanford, 2005, CD-ROM.


Researcher : Lam J

Project Title:A multi-performance approach to reliable control for dynamic systems subject to faults and saturation
Investigator(s):Lam J, Wang J.L., Yang G.H.
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:09/2001
Completion Date:08/2005
Abstract:
To develop of mathematical conditions: a) locally, semi-globally and globally reliable state feedback control results; b) reliable dynamic output feedback controller design; to construct numerical algorithms: a) single and/or multiple-step algorithms for designing reliable controllers to enhance the stability region subject to specified nominal and acceptable performances; b) algorithms for designing reliable controllers to enhance the nominal performance subject to a fixed stability region and a fixed accepptable performance; to generalize results: a) reliable control of delay (retarded and neutral type) systems, and nonlinear systems; b) reliable controller design with system uncertainties.


Project Title:Approximation of dynamic systems with impoved time and frequency-domain objectives
Investigator(s):Lam J, Liu W.Q.
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:10/2002
Completion Date:06/2006
Abstract:
In this project, the research team will study and develop model and controller approximation for both general and specific classes of dynamic systems with linear and nonlinear characteristics. Attention will be given to develop more appropriate time-domain and frequency-domain approximation performance measures. The continuous-time and discrete-time cases wil also be addressed.


Project Title:Stability analysis and controller synthesis for netwrok-based systems
Investigator(s):Lam J, Xu S.Y.
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:02/2004
Completion Date:01/2006
Abstract:
To develop robust synthesis techniques to improve the performances and service quality in network-based control.


Project Title:Development of improved LMI-Type stability and performance conditions for retarded systems
Investigator(s):Lam J, Xu S
Department:Mechanical Engg
Source(s) of Funding:Small Project Funding
Start Date:11/2004
Completion Date:10/2006
Abstract:
To develop stability and performance conditions in terms of linear matrix inequality which are suitable for a wide class of retarded systems with reduced conservatism. A new formulation with multiple time-dependent delay components will be considered.


Project Title:Synthesis Techniques for Multidimensional Dynamic Systems with Delay and Stochastic Effects
Investigator(s):Lam J, Xu S.Y., Galkowski K.
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:Synthesis Techniques for Multidimensional Dynamic Systems with Delay and Stochastic Effects
Investigator(s):Lam J
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2005
Abstract:
N/A


Project Title:Admissibility Conditions and Performance-Based Stabilization of Singular Switched Systems
Investigator(s):Lam J
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:10/2005
Abstract:
N/A


Project Title:Admissibility Conditions and Performance-Based Stabilization of Singular Switched Systems
Investigator(s):Lam J, Xu S.Y., Mao X
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.


List of Research Outputs

Boukas E.K., Xu S., Lam J. and Xiong J., Robust stabilization of singular stochastic systems with delays, IFAC World Congress 2005. Prague, Czech Republic, CD-ROM: 6pp.
Bouokas E.K., Xu S. and Lam J., On stability and stabilizability of singular sochastic systems with delays, Journal of Optimization Theory and Applications. Springer Science+Business Media, Inc., 2005, 127(2): 249-262.
Cao J., Yuan K., Ho D.W.C. and Lam J., Global point dissipativity of neural networks with mixed time-varying delays, Chaos. American Institute of Physics, 2006, 16(1): 013105-01 - 013105-9.
Chen B., Lam J. and Xu S., Memory state feedback guaranteed cost control for neutral delay systems, International Journal of Innovative Computing, Information and Control. ICIC International, 2006, 2(2): 293-303.
Gao H., Lam J., Wang C. and Xu S., Control for stability and positivity: equivalent conditions and computation, IEEE Transactions on Circuits & Systems II. IEEE, 2005, 52(9): 540-544.
Gao H., Lam J. and Wang C., Controller reuction with H¥ error performance: continuous and discrete-time cases, International Journal of Control. Taylor & Francis, 2006, 79(6): 604-616.
Gao H., Lam J., Wang C. and Xu S., H¥ model reduction for uncertain two-dimensional discrete systems, Optimal Control Applications & Methods. Wiley InterScience, 2005, 26(4): 199-227.
Gao H., Lam J. and Wang C., Induced l2 generalized H2 filtering for systems with repeated scalar nonlinearities, IEEE Transactions on Signal Processing. IEEE, 2005, 53(11): 4215-4216.
Gao H., Lam J. and Wang C., Mixed H2/H¥ filtering for continuous-time polytopic systems: a parameter-dependent approaches, Circuits, Systems and Signal Processing. Birkhäuser Boston, 2005, 24(6): 689-702.
Gao H., Lam J. and Wang C., Multi-objective control of vehicle active suspension systems via load-dependent controllers, Journal of Sound and Vibration. Elsevier Ltd., 2006, 290(3-5): 654-675.
Gao H., Lam J., Xie L. and Wang C., New approach to mixed H2/H¥ filtering for polytopic discrete-time systems, IEEE Transactions on Signal Processing. IEEE, 2005, 53(8), Part 2: 3183-3192.
Gao H., Lam J., Shi P. and Wang C., Parameter-dependent filter design with guaranteed H¥ performance, IEE Proceedings: Control Theory and Applications. IEE, 2005, 152(5): 531-537.
Gao H., Lam J. and Wang C., Robust energy-to-peak filter design for stochastic time-delay systems, Systems and Control Letters. Elsevier B.V., 2006, 55(1): 101-111.
Lam J., Associate Editor, Asian Journal of Control. 2006.
Lam J., Associate Editor, Conference Editorial Board of IEEE Control Systems Society. 2006.
Lam J., Associate Editor, International Journal of Systems Science. 2006.
Lam J., Associate Editor, Journal of Sound and Vibration. 2006.
Lam J., H-infinity Model Reduction of Switched Systems, Nanjing University. 2005.
Lam J., Gao H. and Wang C., H¥ model reduction of linear systems with distributed delay, IEE Proceedings: Control Theory and Applications. 2005, 152(6): 662-674.
Lam J., IEE Proceedings: Control Theory and Applications, Editor-in-Chief. 2006.
Lam J., Improvement and simplification of certain stability conditions for retarded systems, Overseas-China Joint Workshop on Control and Automation, Nanjing, China. 2005.
Lam J., Member of Editorial Board, Journal of Applied Functional Differential Equations. 2006.
Lam J., Robust stabilization of Markovian jump systems with uncertain switching probabilities, University of Science and Technology of Suzhou. 2005.
Mao X., Lam J., Xu S. and Gao H., Razumikhin method and exponential stability of hybrid stochastic delay interval systems, Journal of Mathematical Analysis and Applications. Elsevier Inc., 2006, 314(1): 45-66.
Niu Y., Lam J., Wang X. and Ho D., Adaptive H¥ control using backstepping design and neural networks, Journal of Dynamic Systems, Measurement and Control. ASME, 2005, 127(3): 478-485.
Wang Q., Lam J., Xu S. and Zhang H., Delay-dependent g-suboptimal H¥ model reduction for neutral systems with time-varying delays, Journal of Dynamic Systems, Measurement and Control. ASME, 2006, 128(2): 394-399.
Wang Q. and Lam J., H¥ model approximation for discrete-time markovian jump systems with mode-dependent time delays, Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference 2005. Seville, Spain, 6122-6126.
Xiong J. and Lam J., Fixed-order robust H¥ filter design for markovian jump systems with uncertain switching probabilities, IEEE Transactions on Signal Processing. IEEE, 2006, 54(4): 1421-1430.
Xiong J. and Lam J., Robust H¥ control of markovian jump linear systems with uncertain switching probabilities, IFAC World Congress 2005. Prague, Czech Republic, CD-ROM: 6pp.
Xiong J. and Lam J., Stabilization of discrete-time Markovian jump linear systems via time-delayed controllers, Automatica. Elsevier Ltd., 2006, 42(5): 747-753.
Xu H., Zou Y., Xu S., Lam J. and Wang Q., H¥ model reduction of 2-D singular roesser model, Multidimensional Systems and Signal Processing. Springer Science+Business Media, 2005, 16(3): 285-304.
Xu S., Lam J., Chen T. and Zou Y., A delay-dependent approach to robust H¥ filtering for uncertain distributed delay systems, IEEE Transactions on Signal Processing. IEEE, 2005, 53(10): 3764-3772.
Xu S., Lam J. and Ho D.W.C., A new LMI condition for delay-dependent asymptotic stability of delayed hopfield neural networks, IEEE Transactions on Circuits & Systems II. IEEE, 2006, 53(3): 230-234.
Xu S., Lam J., Mao X. and Zou Y., A new LMI condition for delay-dependent robust stability of stochastic time-delay systems, Asian Journal of Control. 2005, 7(4): 419-423.
Xu S. and Lam J., A new approach to exponential stability analysis of neural networks with time-varying delays, Neural Networks. Elsevier Ltd., 2006, 19(1): 76-83.
Xu S., Lam J., Galkowski K. and Lin Z., An LMI approach to the computation of lower bounds for stability margins of 2D discrete systems, Dynamics of Continuous, Discrete, and Impulsive Systems Series B: Applications and Algorithms. Watam Press, 2006, 13(2): 221-236.
Xu S., Lam J., Ho D.W.C. and Zou Y., Delay-dependent exponential stability for a class of neural networks with time delays, Journal of Computational and Applied Mathematics. Elsevier B.V., 2005, 183(1): 16-28.
Xu S., Lam J. and Zou Y., Delay-dependent guaranteed cost control for uncertain systems with state and input delays, IEE Proceedings: Control Theory and Applications. 2006, 153(3): 307-13.
Xu S., Lam J. and Zou Y., Improved conditions for delay-dependent robust stability and stabilization of uncertain discrete time-delay systems, Asian Journal of Control. 2005, 7(3): 344-348.
Xu S., Lam J., Ho D.W.C. and Zou Y., Improved global robust asymptotic stability criteria for delayed cellular neural networks, IEEE Transactions on Systems, Man and Cybernetics Part B. IEEE, 2005, 35(6): 1317-1321.
Xu S., Lam J. and Zou Y., New results on delay-dependent robust H¥ control for systems with time-varying delays, Automatica. Elsevier Ltd., 2006, 42(2): 343-348.
Xu S. and Lam J., Robust Control and Filtering of Singular Systems. London, Springer, 2006, 332: 234 pages.
Xu S., Lam J., Gao H. and Zou Y., Robust H¥ filtering for uncertain discrete stochastic systems with time delays, Circuits, Systems and Signal Processing. Birkhäuser Boston, 2005, 24(6): 753-770.
Xu S., Lam J., Yang G.H. and Wang J.L., Stabilization and H¥ control for uncertain stochastic time-delay systems via non-fragile controllers, Asian Journal of Control. 2006, 8(2): 197-200.
Zhou S., Lam J., Feng G. and Ho D.W.C., Exponential e-Regulation for multi-input nonlinear systems using neural networks, IEEE Transactions on Neural Networks. IEEE, 2005, 16(6): 1710-1714.
Zhou S., Feng G., Lam J. and Xu S., Robust H¥ control for discrete-time fuzzy systems via basis-dependent lyapunov functions, Information Sciences. Elsevier Inc., 2005, 197(3-4): 187-217.


Researcher : Lam SK

List of Research Outputs

Chan A.T.Y., Chau K.W., Wong S.K. and Lam S.K., Air Quality And Property Prices In High Density Urban Areas, Proceedings of the 6th International Conference on Tall Buildings. Hong Kong, 2005, 859-864.
Chau K.W., Wong S.K., Chan A.T.Y. and Lam S.K., 2006 Best Refereed Paper Award, Pacific Rim Real Estate Society. 2006.
Chau K.W., Wong S.K., Chan A.T.Y. and Lam S.K., How do people price air quality: empirical evidence from Hong Kong, 12th Pacific Rim Real Estate Society (PRRES) Conference. Auckland, New Zealand, 2006.


Researcher : Lau EOY

List of Research Outputs

Lau E.O.Y., Tse H.F., Chan R.H.W., Chen W.H., Lee P.Y., Lee S.W.L., Chwang A.T.Y. and Lau C.P., Prediction of aortic augmentation index using radial pulse transmission-wave analysis, Journal of Hypertension. Lippincott Williams & Wilkins, 2006, 24(4): 723-730.


Researcher : Lee KL

List of Research Outputs

Lee K.L., Soh A.K., Wang X.X. and Kwok K.W., Mechanical properties of ferroelectric ceramic nanocomposites, International Journal of Nanoscience. Singapore, World Scienctific Publishing Company, 2006, 4(4): 607-613.


Researcher : Lee SH

List of Research Outputs

Gibson I., Cheung L.K., Chow S.P., Cheung W.L., Beh S.L., Savalani M.M. and Lee S.H., The Use Of Rapid Prototyping To Assist Medical Applications, Rapid Prototyping Journal. UK, Emerald Group Publishing Ltd., 2006, 12: 53-58.


Researcher : Leung MKH

Project Title:Indoor air quality control and mitigation measures for printing plants
Investigator(s):Leung MKH, Chan A.H.S.
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 Hong Kong. A self-assessment software kit will also be developed to facilitate IAQ surveys and audits.


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.


Project Title:Development of photocatalytic disinfection technology for air quality improvement
Investigator(s):Leung MKH, Leung YC, Yam WC, Vrijmoed L.L.P.
Department:Mechanical Engg
Source(s) of Funding:Innovation and Technology Support Programme
Start Date:04/2004
Completion Date:12/2005
Abstract:
To design and construct special laboratory test facilities for laboratory air disinfection test services for the industry.


Project Title:Development of photocatalytic disinfection technology for air quality improvement
Investigator(s):Leung MKH, Leung YC, Yam WC, Vrijmoed L.L.P.
Department:Mechanical Engg
Source(s) of Funding:Innovation and Technology Fund Internship Programme
Start Date:09/2004
Completion Date:08/2005
Abstract:
To design and construct special laboratory test facilities for laboratory air disinfection test services for the industry.


Project Title:Novel local exhaust ventilation device for printing industry
Investigator(s):Leung MKH
Department:Mechanical Engg
Source(s) of Funding:The OSH Enhancement Scheme for SMEs
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:Development of photocatalytic disinfection technology for air quality improvement
Investigator(s):Leung MKH
Department:Mechanical Engg
Source(s) of Funding:Innovation and Technology Fund Internship Programme
Start Date:06/2005
Completion Date:12/2005
Abstract:
To design and construct special laboratory test facilities for laboratory air disinfection test services.


Project Title:Tests of indoor air disinfection device
Investigator(s):Leung MKH, Leung YC
Department:Mechanical Engg
Source(s) of Funding:Other External Funding Scheme - General Award
Start Date:06/2005
Completion Date:07/2005
Abstract:
Tests were conducted to quantify the air disinfection performance of an air cleaner.


Project Title: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:Incentive Award for RGC CERG Fundable But Not Funded Projects
Start Date:07/2005
Completion Date:06/2006
Abstract:
N/A


Project Title:Additional Columbarium at Diamond Hill Consultancy Services for the Joss Paper Burning, Smoke & Ash Treatment Systems
Investigator(s):Leung MKH, Leung YC
Department:Mechanical Engg
Source(s) of Funding:Architectural Services Department - General Award
Start Date:10/2005
Completion Date:08/2006
Abstract:
To conduct site visit(s) to existing columbaria to study the process of joss paper burning, associated equipment, inputs and other provisions as required for the burning tests and smoke and temperature measurements; to survey the weight of ash generated during the peak seasons and off-peak seasons at existing local columbaria; to estimate the weight of ash generated during the peak seasons and off-peak seasons at the new columbarium; to set up and perform on-site tests for the smoke flow and temperature measurements in a joss paper burner by simulating the peak and non-peak conditions. The measurements include: a) at the main chimney stack, airflow and smoke flow rates, and temperature, b) temperature at individual joss paper burners. The aforementioned measurements are used to determine the smoke / flue gas flow rate and temperature along the exhaust pathway during the burning process. Afterward, it is used to estimate the amount of smoke / flue gas exhaust from the new columbaria.


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

Chan B.P., Leung M.K.H., Yeung C.W., Li J., Mo I. and Chan G.C.F., A novel 3-dimensiona culture system for human mesenchymal stem cells, International Society for Stem Cell Research 4th Annual Meeting. Toronto, Ontario, Canada, 2006, 98.
Chau O.K.Y., Liu C.H. and Leung M.K.H., CFD analysis of the performance of a local exhaust ventilation system in a hospital patient ward, Indoor and Built Environment. 2006, 25(3): 257-271.
Lam R.C.W., Leung M.K.H., Leung Y.C., Vrijmoed L.L.P., Yam W.C., Ng S.P. and Chu P.K., Photocatalytic glass reactor for solar-assisted air purification, Proceedings of the 2005 Solar World Congress. Orlando, Florida, USA, 2005, CD-ROM.
Leung M.K.H. and Chan A.H.S., Control and management of hospital indoor air quality, Medical Science Monitor. 2006, 12(3): SR17-23.
Leung M.K.H., Leung Y.C. and Lam H.N., Integrated heat pump for high energy efficiency, Proceedings of the 2nd International Conference on Energy Efficiency and Conservation. Hong Kong, Intercontinental Grand Stanford, 2005, CD-ROM.
Leung M.K.H., Liu C.H. and Chan A.H.S., Occupational exposure to volatile organic compounds and mitigation by push-pull local exhaust ventilation in printing plants, Journal of Occupational Health. 2005, 47: 540-547.
Leung M.K.H., Liu C.H., Chan A.H.S., Leung Y.C., Yam W.C., Ng S.P. and Vrijmoed L.L.P., Prediction of transient turbulent dispersion by CFD-statistical hybrid modeling method, Atmospheric Environment. Oxford, UK, Elsevier Ltd., 2005, 39: 6345-6351.
Ni M., Leung M.K.H., Leung Y.C. and Sumathy K., An analytical study of porosity effect on dye-sensitized solar cell performance, Solar Energy Materials & Solar Cells. Amsterdam, Netherlands, Elsevier B.V., 2006, 90: 1331-1344.
Ni M., Leung M.K.H. and Leung Y.C., An electrochemistry model of solid oxide steam electrolyzer for hydrogen production, Chemical Engineering & Technology. Wiley Interscience, 2006, 29: 636-642.
Ni M., Leung Y.C., Leung M.K.H. and Sumathy K., An overview of hydrogen production from biomass, Fuel Processing Technology. Amsterdam, Netherlands, Elsevier B.V., 2006, 87: 461-472.
Ni M., Leung M.K.H. and Leung Y.C., Electrochemistry modeling of proton exchange membrane (PEM) water electrolysis for hydrogen production, Proceedings of 16th World Hydrogen Energy Conference (WHEC16). Lyon, France, 2006, CD-ROM.
Ni M., Leung M.K.H. and Leung Y.C., Prospect of solid oxide steam electrolysis for hydrogen production, Proceedings of 16th World Hydrogen Energy Conference (WHEC16). Lyon, France, 2006, CD-ROM.
Ni M., Leung M.K.H. and Leung Y.C., Technological development and prospect of alkaline fuel cells, Proceedings of 16th World Hydrogen Energy Conference (WHEC16). Lyon, France, 2006, CD-ROM.


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, Xia J.Y.
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:Development of a three-dimensional numerical model for air pollution study in urban street canyons
Investigator(s):Leung YC, Lam KM, Xia J.Y.
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:12/2003
Abstract:
N/A


Project Title:Air ventilation and heat island effects in urban areas
Investigator(s):Leung YC, Liu CH, Leung MKH
Department:Mechanical Engg
Source(s) of Funding:Small Project Funding
Start Date:11/2004
Completion Date:12/2005
Abstract:
To determine the mechanism of pollutant removal and heat energy dissipation from street canyons of different aspect ratios, and costrast the air quality and thermal comfort in urban areas with particular emphasis on temperature, air and pollutant exchange rates, etc.


Project Title:Numerical investigation of the physical and chemical processes of air pollutants in urban street canyons
Investigator(s):Leung YC
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2005
Abstract:
N/A


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:Production of biodiesel fuel using grease trap waste oil
Investigator(s):Leung YC
Department:Mechanical Engg
Source(s) of Funding:Dynamic Progress International Ltd. - General Award
Start Date:08/2005
Completion Date:07/2006
Abstract:
To study the production of biodiesel fuel using grease trap waste oil.


Project Title:Performance test of a pilot FGD system
Investigator(s):Leung YC
Department:Mechanical Engg
Source(s) of Funding:Hong Kong Productivity Council - General Award
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
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2006
Abstract:
N/A


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 Pearl River Delta region:sources and mitigations
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 Hong Kong is inherently a regional-scale problem. The increasing ground-level ozone concentration and decreasing visibility in our harbour served as a good indication of continuous deterioration of the regional air quality (Wang 2003). The problem is particularly serious for ozone and fine particles (smog) that cannot be solved solely by source control and managements in Hong Kong itself. In fact, these pollutants are secondary-pollutant formed from primary pollutants through a complex series of chemical reactions occurring in the atmospheric boundary layer and involve pollutants emitted from a variety of sources (e.g. vehicles, power plants and factories). A recent study (HKEPD 2002) found that the economy, population, electricity demand and vehicle mileage in the Pearl River Delta (PRD) region will grow by about two folds from 1997 to 2010. To cope with the deterioration in the regional air quality, the HKSAR Government and the Guangdong Provincial Government reached a consensus in 2002 for air pollutant emission reduction and jointly drew up the PRD Regional Air Quality Management Plan in 2003. Under the management plan, the two governments would set up a regional air quality monitoring network to be in operation in 2005. With the air quality data from the network, it is feasible to analyze the regional air quality problems in a wider aspect, which can help to develop comprehensive mitigation measures to combat the air pollution problems in the region. The followings are the objectives of the proposed study: 1. Identify long term trends and possible epidodic events of severe air pollution in the Pearl River Delta region; 2. Establish the relationship between the air pollution in HK and PRD; 3. Investigate the relative importance of local and transported air pollutants to air quality in HK and PRD. References: HKEPD (2003), Air Quality in Hong Kong 2003, Environmental Protection Dept., HKSAR. HKEPD (2002), Study of Air Quality in the Pearl River Delta Region, Environmental Protection Dept., HKSAR. Wang, T. (2003), Study of Visibility Reduction and its Causes in Hong Kong, Research Centre for Environmental Technology and Management, Dept. of Civil and Structural Engineering, The Hong Kong Polytechnic University.


List of Research Outputs

Lam R.C.W., Leung M.K.H., Leung Y.C., Vrijmoed L.L.P., Yam W.C., Ng S.P. and Chu P.K., Photocatalytic glass reactor for solar-assisted air purification, Proceedings of the 2005 Solar World Congress. Orlando, Florida, USA, 2005, CD-ROM.
Leung M.K.H., Leung Y.C. and Lam H.N., Integrated heat pump for high energy efficiency, Proceedings of the 2nd International Conference on Energy Efficiency and Conservation. Hong Kong, Intercontinental Grand Stanford, 2005, CD-ROM.
Leung M.K.H., Liu C.H., Chan A.H.S., Leung Y.C., Yam W.C., Ng S.P. and Vrijmoed L.L.P., Prediction of transient turbulent dispersion by CFD-statistical hybrid modeling method, Atmospheric Environment. Oxford, UK, Elsevier Ltd., 2005, 39: 6345-6351.
Leung Y.C., Koo B.C.P. and Guo Y., Degradation of biodiesel under different storage conditions, Bioresource Technology. Oxford, UK, Elsevier Ltd., 2006, 97: 250-256.
Leung Y.C., Luo Y. and Chan T.L., Optimization of exhaust emissions of a diesel engine fuelled with biodiesel, Energy & Fuels. Washington D.C., USA, American Chemical Society, 2006, 20: 1015-1023.
Li X., Liu C.H. and Leung Y.C., Development of a k-e model for the determination of air exchange rate for street canyons, Atmospheric Environment. Oxford, UK, Elsevier Ltd., 2005, 39: 7285-7296.
Li Y.S., Chan T.H.T., Kwong A.K.L., Leung Y.C., Luk K.M., So R.M.C. and Wong K.P., Hong Kong Institution of Engineers, Transactions. Hong Kong, HKIE, 2005, 12(3): 47.
Liu C.H. and Leung Y.C., Finite element solution to passive scalar transport behind line sources under neutral and unstable stratification, International Journal for Numerical Methods in Fluids. NJ, USA, John Wiley & Sons, Ltd., 2006, 50: 623-648.
Liu C.H., Woo C.M. and Leung Y.C., Performance analysis of a Linux PC cluster uisng a direct numerical simulation of fluid turbulence code, International Journal of High Performance Computing Applications. London, UK, Sage Publications, 2005, 19: 365-374.
Liu C.H., Woo C.M. and Leung Y.C., Performance analysis of a parallel finite element solution to the direct numerical simulation of fluid turbulence on Linux PC clusters, Applied Mathematics and Computation. Elsevier Inc., 2006, 172: 731-743.
Ni M., Leung M.K.H., Leung Y.C. and Sumathy K., An analytical study of porosity effect on dye-sensitized solar cell performance, Solar Energy Materials & Solar Cells. Amsterdam, Netherlands, Elsevier B.V., 2006, 90: 1331-1344.
Ni M., Leung M.K.H. and Leung Y.C., An electrochemistry model of solid oxide steam electrolyzer for hydrogen production, Chemical Engineering & Technology. Wiley Interscience, 2006, 29: 636-642.
Ni M., Leung Y.C., Leung M.K.H. and Sumathy K., An overview of hydrogen production from biomass, Fuel Processing Technology. Amsterdam, Netherlands, Elsevier B.V., 2006, 87: 461-472.
Ni M., Leung M.K.H. and Leung Y.C., Electrochemistry modeling of proton exchange membrane (PEM) water electrolysis for hydrogen production, Proceedings of 16th World Hydrogen Energy Conference (WHEC16). Lyon, France, 2006, CD-ROM.
Ni M., Leung M.K.H. and Leung Y.C., Prospect of solid oxide steam electrolysis for hydrogen production, Proceedings of 16th World Hydrogen Energy Conference (WHEC16). Lyon, France, 2006, CD-ROM.
Ni M., Leung M.K.H. and Leung Y.C., Technological development and prospect of alkaline fuel cells, Proceedings of 16th World Hydrogen Energy Conference (WHEC16). Lyon, France, 2006, CD-ROM.
Xia J., Hussaini M.Y. and Leung Y.C., Numerical simulation of street canyon flows with simple building geometries, Journal of Environmental Engineering. Virginia, USA, ASCE, 2005, 131: 1099-1105.
Xia J., Leung Y.C. and Hussaini M.Y., Numerical simulations of flow-field interactions between moving and stationary objects in idealized street canyon settings, Journal of Fluids and Structures. Oxford, UK, Elsevier Ltd., 2006, 22: 315-326.
Yin X., Chang J., Wang J.F., Fu Y., Wu C.Z. and Leung Y.C., Methanol synthesis from biomass derived syngas, Acta Energiae Solaris Sinica. Beijing, China, China Solar Energy Society, 2005, 26: 518-522.


Researcher : Li H

List of Research Outputs

Li H., Ngan A.H.W. and Wang M., Continuous strain bursts in crystalline and amorphous metals during plastic deformation by nanoindentation, Journal of Materials Research. Materials Research Society, 2005, 20: 3072-3081.


Researcher : Li X

List of Research Outputs

Li X., Liu C.H. and Leung Y.C., Development of a k-e model for the determination of air exchange rate for street canyons, Atmospheric Environment. Oxford, UK, Elsevier Ltd., 2005, 39: 7285-7296.


Researcher : Li Y

Project Title:A theory of enclosure ventilation driven by combined forces
Investigator(s):Li Y, Chan ATY, Delsante A.
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, Nielsen P.V., Wong TW
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, Yuen 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, Kwan JK, Yu SCT, Yuen PL
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, Roesler M., Seifert J., Xie Xiaojian
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:Dispersion and ventilation control of exhalation pollutants in hospital wards
Investigator(s):Li Y
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2005
Abstract:
N/A


Project Title:Nonlinear coupling of thermal mass and natural ventilation in buildings
Investigator(s):Li Y
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:09/2005
Abstract:
N/A


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 China and Hong Kong


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.


List of Research Outputs

Duan S. and Li Y., An example of solution multiplicity in a building with bi-directional flow openings, Indoor Built Environ. Sage Publications, 2005, 14(5): 359-369.
Greig A.R., Eames I., Tang J.W. and Li Y., Modelling the removal of contaminated ballast water, Orally Presented in the Word Maritime Technology Conference. Westminster, London, 2006.
Li Y. and Yang X.D., Chinese kangs - thermon-fluid principles, present status and future, Proceedings of the 4th National Conference on New Advances of Refrigeration and Air-conditioning. Nanjing, China, 2006, 82-87.
Li Y., Xu P., Qian H., Deng Q. and Wu J., Flow bifurcation due to opposing buoyancy in two vertically connected open cavities, International Journal of Heat and Mass Transfer. Elsevier, 2006, 49: 3298-3312.
Li Y., Green Building Award 2006 - Merit Award for the research category - the sustainable design for the fukien secondary school Hong Kong, In: Ruben Chan, K S Wong, Professional Green Building Council of Hong Kong PGBC. Hong Kong, 2006.
Li Y., Duan S. and Zhang G., Multiple solutions in a building with four openings ventilated by combined forces, Indoor Built Environ. Sage Publications, 2005, 14(5): 347-358.
Li Y., Nonlinear dynamical phenomea in natural ventilation - analysis and design, Proceedings of 2005 年全國暖通空調轉業委員會 - 空調模拟分析學組學術交流會, 2005, 106-121.
Li Y., Ching W.H., Qian H. and Yuen P.L., Performance of air-conditioning systems in sars negative pressure isolation rooms, Proceedings of Asian Conference on Refrigeration and Air-conditioning ACRA. Gyeongju, Korea, 2006, 1: 213-220.
Li Y. and Xu P., Thermal mass design in buildings - Heavy or Light, Proceedings of Hubei-Hong Kong Joint Symposium 2005. Wuhan, China, 118-127.
Li Y. and Xu P., Thermal mass design in buildings - heavy or light?, International Journal of Ventilation. 2006, 5(1): 143-150.
Li Y. and Xu P., Thermal mass design in buildings - heavy or light?, Invited Paper in Proceedings of Second International Workshop on Natural Ventilation. Japan, 2005, 19.1-19.10.
Liddament M., Axley J., Heiselberg P., Li Y. and Stathopoulos T., Achieving natural and hybird ventilation in practice, International Journal of Ventilation. 2006, 5(1): 115-130.
Qian H., Nielsen P.V., Li Y. and Hyldgaard C.E., Dispersion of exhalation pollutants in a two-bed hospital ward with a downward ventilation system, Proceedings of the 10th Internatioanl Conference on Indoor Air Quality and Climate, Indoor Air 2005. Beijing, China, 3541-3545.
Qian H., Li Y., Nielsen P.V., Hyldgaard C.E., Wong T.W. and Chwang A.T.Y., Dispersion of exhaled droplet nuclei in a two-bed hospital ward with three different ventilation systems, Indoor Air. Blackwell Munksgaard, 2006, 16: 111-128.
Qian H., Li Y., Nielsen P.V. and Huang X., Prediciting spatial distributin of infection risk of airborne transmission diseases in a hospital ward, Proceedings of Healthy Buildings 2006. Lisboa, Portugal, I: 131-136.
Tang J.W., Eames I., Li Y., Taha Y.A., Wilson P., Bellingan G., Ward K.N. and Breuer J., Door-opening motion can potentially lead to a transient breakdown in negative-pressure isolation conditions: the importance of vorticity and buoyancy airflows, Journal of Hospital Infection. Elsevier, 2005, 61: 283-286.
Tsui K.C. and Li Y., Near-building vertical concentration profile of air pollutants in a densely populated and high-rise urban environment, Proceedings of Healthy Buildings 2006. Lisboa, Portugal, III: 43-148.
Xie X. and Li Y., How far respiratory droplets move in indoor environments, Proceedings of Healthy Buildings 2006. Lisboa, Portugal, I: 309-314.
Xie X., Li Y., Zhang T. and Fang H., Survival of bacteria in evaporating droplets deposited on a teflon-coated surface, Proceedings of Healthy Buildings 2006. Lisboa, Portugal, II: 381-386.
Yang L., Li Y., Zhang G.Q. and Chen Y.M., Dependence of CFD predictions on initial conditions for turbulent indoor airflows and pollutant spread, Proceedings of the 10th International Conference on Indoor Air Quality and Climate. Beijing, China, Indoor Air 2005, 2005, III: 1690-2695.
Yang L., Xu P. and Li Y., Nonlinear dynamic analysis of natural ventilation in a two-zone building: Part A - Theoretical analysis, HVAC&R Research. 2006, 12(2): 231-256.
Yang L., Xu P., Li Y. and Zhang G., Nonlinear dynamic analysis of natural ventilation in a two-zone building: Part B-CFD simulations, HVAC&R Research. 2006, 12(2): 257-278.


Researcher : Liu F

List of Research Outputs

Liu F. and Wang L., Multiplicity of flow and heat transfer in tightly coiled ducts, In: (Progress in Computational Heat and Mass Transfer, Ed. By R. Bennacer, A.A. Mohamad, M.E. Ganaoui and J. Sicard), Proceedings of the 4th International Conference on Computational Heat and Mass Transfer. 2005, 165-167.


Researcher : Liu Y

List of Research Outputs

Liu Y. and Wang M., A novel composite material for bone tissue regeneration, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 165.
Liu Y. and Wang M., Developing a composite material for bone tissue repair, Proceedings of the 3rd Sino-Korea Symposium on Biomaterial & Nano-Biotechnology. Guangzhou, China, 2006, 24.
Liu Y. and Wang M., Manufacture and characterisation of a bioactive and biodegradable composite developed for bone tissue repair, Proceedings of the 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. USA, IEEE, 2005, 4103-4106.
Liu Y. and Wang M., Structure and properties of injection-moulded hydroxyapatite reinforced polyhydroxybutyrate, (Invited paper), Proceedings of the 3rd International Symposium on Apatite and Correlative Biomaterials. Wuhan, China, 2005, 76.


Researcher : Lu D

List of Research Outputs

Lu D. and Chwang A.T.Y., Interfacial waves due to a singularity in a system of two semi-infinite fluids, Physics of Fluids. American Institute of Physics, 2005, 17: 102107-1-9.
Lu D. and Chwang A.T.Y., Unsteady interaction between viscous far wakes and a free surface due to a two-dimensional submerged body, In: Ed. G.P. Miao and R.C. Zhu, Proceedings of the 3rd Asia-Pacific Workshop on Marine Hydrodynamics. Shanghai, China, 2006, 310-314.


Researcher : Luo Y

List of Research Outputs

Leung Y.C., Luo Y. and Chan T.L., Optimization of exhaust emissions of a diesel engine fuelled with biodiesel, Energy & Fuels. Washington D.C., USA, American Chemical Society, 2006, 20: 1015-1023.


Researcher : Mak CC

List of Research Outputs

Chow K.W. and Mak C.C., A simple model for the two dimensional blood flow in the collapse of veins, Journal of Mathematical Biology. 2006, 52: 733-744.
Chow K.W., Mak C.C., Rogers C. and Schief W., Doubly-periodic and multiple pole solutions of the sinh-Poisson equation: Application of reciprocal transformations in subsonic gas dynamics, Journal of Computational and Applied Mathematics. 2006, 190: 114-126.


Researcher : Malomed BA

List of Research Outputs

Chow K.W., Malomed B.A. and Nakkeeran K., Exact solitary- and periodic-wave modes in coupled equations with saturable nonlinearity, Physics Letters A. 2006, 359: 37 - 41.


Researcher : Nakkeeran K

List of Research Outputs

Chow K.W., Malomed B.A. and Nakkeeran K., Exact solitary- and periodic-wave modes in coupled equations with saturable nonlinearity, Physics Letters A. 2006, 359: 37 - 41.


Researcher : Ng CO

Project Title:Dispersion of a chemical species subject to sorptive exchange in a wave boundary layer
Investigator(s):Ng CO
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):Ng CO, Zhang D, Bai Y.C.
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 China. (2) mass transport of non-Newtonian fluid mud induced by surface waves. (3) dispersion of contaminants in fluid mud under waves. (4) effect of watercraft on the erosion of botton sediment.


Project Title:Nonlinear interaction between surface gravity waves and non-Newtonian fluid mud
Investigator(s):Ng CO, Zhang D, Bai Y.C.
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:12/2003
Abstract:
N/A


Project Title:On the Control of Electroconvection in the Manufacture of Smart Materials Free From Impurities
Investigator(s):Ng CO, Rudraiah N.
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):Ng CO
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2005
Abstract:
N/A


Project Title:Dispersion mechanisms in biomechanics of synovial joints and coronary artery diseases
Investigator(s):Ng CO, Rudraiah N.
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:Analysis of Electroconvective Instability in the Manufacture of Smart Materials
Investigator(s):Ng CO
Department:Mechanical Engg
Source(s) of Funding:Incentive Award for RGC CERG Fundable But Not Funded Projects
Start Date:07/2005
Completion Date:06/2006
Abstract:
N/A


List of Research Outputs

Bai Y., Ng C.O. and Huang T., A numerical study on the structure and dynamics of turbulence in oscillatory bottom layer flow over a flat or rippled bed, China Ocean Engineering. Beijing, China, China Ocean Press, 2006, 20(1): 45-60.
Bai Y., Xu H., Xu D. and Ng C.O., Nonlinear dynamical characteristics of bed load motion, Science in China: Series E Technological Sciences. Beijing, China, Science in China Press, 2006, 49(3): 365-384.
Huang L., Ng C.O. and Chwang A.T.Y., A Fourier-Chebyshev collocation method for the mass transport in a layer of power-law fluid mud, Computer Methods in Applied Mechanics and Engineering. Oxford, UK, Elsevier Science Ltd, 2006, 195(9-12): 1136-1153.
Huang L., Ng C.O. and Chwang A.T.Y., A spectral method for the mass transport in a layer of power-law fluid under periodic forcing, In: Allen T Chwang, Michelle H Teng & Daniel T Valentine, Advances in Engineering Mechanics — Reflections and Outlooks: in Honor of Theodore Y-T Wu. Singapore, World Scientific, 2005, 633-650.
Huang L., Ng C.O. and Chwang A.T.Y., Spectral method applied to mass transport due to standing waves in water over non-Newtonian mud, Proceedings of the Sixteenth (2006) International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. California, USA, ISOPE, 2006, 552-559.
Ng C.O., Dispersion in Flows Through a Tube Subject to Wall Reactions as Applied to Dispersion in Pulmonary Airways, Invited Lecture at ICAFMIE 06, International Conference on Application of Fluid Mechanics in Industry and Environment, Indian Statistical Institute, India, August 28-31. 2006.
Ng C.O., Dispersion in open-channel flow subject to the processes of sorptive exchange on the bottom and air-water exchange on the free surface, Fluid Dynamics Research. Amsterdam, Netherlands, North-Holland, 2006, 38(6): 359-385.
Ng C.O. and Bai Y.C., Dispersion in oscillatory Couette flow with sorptive boundaries, Acta Mechanica. Wien, Austria, Springer Wien New York, 2005, 178: 65-84.
Ng C.O., Dispersion in steady and oscillatory flows through a tube with reversible and irreversible wall reactions, Proceedings of the Royal Society A. London, UK, The Royal Society, 2006, 462(2066): 481-515.
Ng C.O., Rudraiah N., Nagaraj C. and Nagaraj H.N., Electrohydrodynamic dispersion of macromolecular components in nanostructured biological bearing, Journal of Energy, Heat and Mass Transfer. Chennai, India, Regional Centre for Energy, Heat and Mass Transfer, 2005, 27: 39-64.
Ng C.O. and Zhang X., Mechanics of Water Waves over a Viscoelastic Mud Layer, Invited Presentation at ISOPE 2006 - The 16th International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. 2006.
Ng C.O. and Zhang X., Mechanics of water waves over a viscoelastic mud layer, Proceedings of the Sixteenth (2006) International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. California, USA, ISOPE, 2006, 702-708.
Ng C.O., Zhang X. and Zhang D., On the oscillatory and mean motions induced by waves propagating in a thin viscoelastic layer, The Second Jiangsu-Hong Kong Forum on Mechanics and Its Application, Nanjing, China, May 27-28. Nanjing, China, Jiangsu Society of Theoretical and Applied Mechanics, 2006, 3pp.
Ng C.O., 教育部引智計劃專家, 教育部直屬高校聘請外國專家重點項目資助, 2006.
Zhang X. and Ng C.O., Mass transport in water waves over a thin layer of viscoelastic mud, Abstract 351, USNCTAM’06, The 15th U.S. National Congress on Theoretical and Applied Mechanics, Boulder, Colorado, USA, June 25-30. Boulder, USA, University of Colorado, 2006, 1pp.
Zhang X. and Ng C.O., Mud-wave interaction: a viscoelastic model, China Ocean Engineering. Beijing, China, China Ocean Press, 2006, 20(1): 15-26.
Zhang X. and Ng C.O., On the oscillatory and mean motions due to waves in a thin viscoelastic layer, Wave Motion. Amsterdam, Netherlands, Elsevier Science B.V., 2006, 43(5): 387-405.


Researcher : Ngan AHW

Project Title:Stress-exponent measurement of nano-grained thin-films by nanoindentation
Investigator(s):Ngan AHW, Yang W.
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:Energetic pathway prediction in dislocation processes by 3-D atomistic simulation
Investigator(s):Ngan AHW
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:09/2003
Completion Date:08/2006
Abstract:
To use atomistic simulation to study the energetic pathways in the following 3-D dislocation activation processes: (i) cross-slip, (ii) kink-pair processes, (iii) homogeneous dislocation nucleation as detected in nanoindentation.


Project Title:Energetic pathway prediction in dislocation processes by 3-D atomistic simulation
Investigator(s):Ngan AHW
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:09/2003
Abstract:
N/A


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:Nanomechanical Behaviour of Hexagonal Close-Packed Metals
Investigator(s):Ngan AHW
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:01/2005
Completion Date:12/2005
Abstract:
In the present era of microtechnology and the forthcoming era of nanotechnology, electro-mechanical machines are often made with components in the sub-micron length scale. Very often, the operation of these machines requires mechanical contacts generating GPa level contact stresses. An accurate understanding of the mechanical properties of materials subject to sub-micron dimension contacts and high stress levels is therefore essential to the successful design and operation of micro-machines. The pioneering experiments by Fleck et al. [Acta Metall. Mater. 42 (1994), 475-487] and others about a decade ago have triggered a lot of interest in the solid mechanics and materials science communities to understand how materials strength varies with size in the submicron length scale. Apart from being an academic interest, the rapid development of new capabilities and design methodologies in fabricating electro-mechanical systems at the micron or submicron length scales also calls for an urgent need to understand better how materials behave mechanically in the submicron length scale, as the successful design and operation of these micron machines rely on satisfactory material performance at this length scale. While static strength has been the focus in the past, other mechanical properties such as fatigue, fracture, impact strength, creep, wear, etc., are obviously equally important. However, much less has been known about how these properties vary with length scale in the submicron regime. As an example, fatigue behaviour in bulk metals are well-known to be governed by microstructural mechanisms such as persistent slip bands, but these are micron-scaled phenomena and so if the material size is in the submicron regime, the expectation is that the fatigue behaviour will be very different. The relevant experimental database, however, is still largely blank at the moment. In terms of materials, face-centred cubic (FCC) and body-centered cubic (BCC) metals have been the usual materials chosen for investigation by the nanomechanics community so far. On the other hand, although many hexagonal close-packed (HCP) materials such as titanium, zinc and magnesium are bases of advanced engineering materials in bulk applications, their corresponding nanomechanical behaviours are much less well known than the FCC and BCC counterparts. HCP materials have intrinsically far fewer slip systems than FCC and BCC materials, and so the nanomechanical behaviour can be expected to be very different. Preliminary work by the PI has shown that, presumably because of limited slip systems, nano-scale indents are highly anisotropic in shape, and the onset of plastic deformation is marked by multiple rather than single strain bursts likely to correspond to sub-micron scale cracking of the crystal planes. There is so far no existing report in the literature concerning these phenomena, and so these preliminary results are very novel. The aim of this research is therefore to use nanoindentation methods to fully characterize the nanomechanical behaviour of a range of HCP metals. The data collected should form a useful basis for further research by transmission electron microscopy and also by molecular dynamics modelling, the funding of these activities will be sought by means of a future RGC-CERG proposal.


Project Title:Creep effects in high-temperature nanoindentation
Investigator(s):Ngan AHW
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2005
Abstract:
N/A


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:Merit Award for RGC CERG Funded Projects
Start Date:09/2005
Abstract:
N/A


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:Size Effect of Incipient Plasticity in Crystals Investigated by Spherical Nanoindentation
Investigator(s):Ngan AHW
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:02/2006
Completion Date:01/2007
Abstract:
Dimiduk, Nix and co-workers have demonstrated that FIB-fabricated micro-pillars exhibit significant size effect in their initial yield strength [Science 50, 986 (2004)]. Smaller micro-pillars were found to yield at significantly higher stresses than larger micro-pillars. They attribute this to “dislocation starvation”. Although some of the pillars tested were in the range of dozens of microns and hence the chance of them containing no initial dislocations is small, Nix and co-workers believe that these initial dislocations quickly operate and become annihilated at the free surfaces, and hence fresh ones will have to be generated somewhere [private communication at ECI conference on Instrumented Indentation, Crete, 2005]. This ties in well with their experimental observation that the load-displacement curves exhibit serrations each of which is believed to represent a cycle in which dislocations are generated and then exhausted. The PI also demonstrated using nanoindentation with Berkovich indenter that the first pop-in loads recorded from bulk annealed crystals exhibit significant statistical scatter and time dependence [Phys. Rev. Lett., 94, 095501 (2005); Scripta Materialia, accepted]. Indentations performed at identical macroscopic conditions (e.g. within the same grain, similar surface conditions, etc.) do not exhibit the same pop-in load but instead the pop-in loads show statistical scatter. Holding the load in the initially elastic regime will also lead to an eventual pop-in, indicating that the “elastic-limit” of a small volume is dependent on time. The three aspects of sub-micron strength discussed so far, namely, size dependence, statistical scatter, and time dependence, are analogous to the well-known characteristics of the fracture strength of bulk ceramics. In ceramics, the reason of course is due to the statistical occurrence of flaws and their subcritical growth under corrosive environments. In the case of submicron crystals, Ngan recently proposed that these three aspects of strength are all related to the statistical occurrence of thermally agitated atomic locations for homogeneous dislocation nucleation. This belief was augmented by MD simulations on Ni3Al which show that in a block of perfect crystal under intense shear at finite temperatures, dislocation always originate from atomic sites, called “hot spots”, which are momentarily displaced significantly with respect to their neighbors. The occurrence of these hot spots is stochastic, as is similar to the occurrence of flaws of critical sizes in bulk ceramics, and hence the overall strength of the submicron crystal exhibits the three interesting aspects as discussed above. Based on this idea, the PI proposed a survival probability analysis, similar to the Weibull statistics in bulk ceramics, for the strength of submicron Ni3Al [Phys. Rev. Lett., 94, 095501 (2005); Scripta Materialia, accepted]. The theory uses input from MD simulations (mainly the occurrence probability of the “hot spots”), and is able to predict the failure (i.e. incipient plasticity) load in a general specimen geometry (e.g. conical indentation, compression of FIB-pillars, etc) given a prescribed survival probability. The idea therefore is to start from the behavior of very small “specimens” at femto-scale time scale (the MD simulation blocks), and then to project into micron-sized behavior at real time scales. This again is analogous to the use of Weibull statistics in bulk ceramics. The PI’s theory was found to work well for the indentation experiments on statistical scatter and time-dependence of strength in Ni3Al, as shown in fig. 1 and 2 in Section VI below. However, it overestimates the yield strengths of the FIB-fabricated Ni3Al pillars in Uchic et al.’s experiments by a few times, although the decreasing trend of the strength as size increases is predicted. The problem in applying the theory to the FIB-pillars lies on the fact that dislocation nucleation in these pillars probably starts from the free surfaces, which are probably implanted with Ga atoms as well during the FIB fabrication, but the theory is based on MD simulation which is difficult to capture the hot spot statistics at a free surface. The aim of this investigation is therefore to use spherical indentation to study the size dependence of incipient plasticity in annealed crystals.


List of Research Outputs

Afrin N. and Ngan A.H.W., Creep of micron-sized Ni3Al columns, Scripta Materialia. Elsevier, 2006, 54: 7-12.
Chow S.P., Lam K.W., Gibson I., Ngan A.H.W., Lu W.W., Ip W.Y. and Chiu P.K.Y., A novel artificial prosthetic replacement for the proximal interphalangeal joint of the hand - From concept to prototype, Hand Surgery. 2005, 10(2&3): 159-168.
Li H., Ngan A.H.W. and Wang M., Continuous strain bursts in crystalline and amorphous metals during plastic deformation by nanoindentation, Journal of Materials Research. Materials Research Society, 2005, 20: 3072-3081.
Lu W.W., Ni G., Li Z., Tan B., Cheung K.M.C., Ngan A.H.W., Leong J.C.Y. and Luk K.D.K., Nanostructural and nanomechanics of the bone-cement interface in vivo, 25th Annual Congress of the Hong Kong Orthopaedic Association, Nov 19-20 2005, Hong Kong. 2005.
Ngan A.H.W., "Weibull-like Characteristics of Yielding of Submicron Crystals: Experiments and Theory", invited Keynote Lecture, International Conference on Computational & Experimental Engineering and Sciences ICCES 2005, 1-6 December, 2005, Indian Institute of Technology Madras, Chennai, India. 2005.
Ngan A.H.W. and Wo P.C., Delayed plasticity in nanoindentation of annealed crystals, Philosophical Magazine. Taylor & Francis, 2006, 86: 1287-1304.
Ngan A.H.W., Member of the Editorial Board, International Journal of Surface Science and Engineering. Inderscience Publishers, 2006.
Ngan A.H.W., Non-planar dislocations: 3D models and thermally-activated glide processes, Materials Science and Engineering A. Elsevier, 2005, 400-401: 25-36.
Ngan A.H.W., Zuo L. and Wo P.C., Probabilistic nature of the nucleation of dislocations in an applied stress field, Scripta Materialia. Elsevier, 2006, 54: 589-593.
Ngan A.H.W., Zuo L. and Wo P.C., Size dependence and stochastic nature of yield strength of micron-sized crystals: a case study on Ni3A1, Proceedings of the Royal Society of London A. London, U.K., The Royal Society, 2006, 462: 1661-1681.
Ni G., Lu W.W., Tang B., Ngan A.H.W., Chiu P.K.Y., Cheung K.M.C., Li Z. and Luk K.D.K., Mechanical properties of interfaces between bone and strontium-containing hydroxyapatite bone cement under non- and weight-bearing conditions by nanoindentation, 52nd Annual Meeting of Orthopaedic Research Society, Chicago, Illinois, March 19-22, 2006.
Wo P.C., Ngan A.H.W. and Chiu Y.L., TEM measurement of nanoindentation plastic zones in Ni3Al, Scripta Materialia. Elsevier, 2006, 55: 557-560.
Zuo L. and Ngan A.H.W., Molecular dynamics study on compressive yield strength in Ni3Al micro-pillars, Philosophical Magazine Letters. Taylor & Francis, 2006, 86(6): 355-365.


Researcher : Ni M

List of Research Outputs

Ni M., Leung M.K.H., Leung Y.C. and Sumathy K., An analytical study of porosity effect on dye-sensitized solar cell performance, Solar Energy Materials & Solar Cells. Amsterdam, Netherlands, Elsevier B.V., 2006, 90: 1331-1344.
Ni M., Leung M.K.H. and Leung Y.C., An electrochemistry model of solid oxide steam electrolyzer for hydrogen production, Chemical Engineering & Technology. Wiley Interscience, 2006, 29: 636-642.
Ni M., Leung Y.C., Leung M.K.H. and Sumathy K., An overview of hydrogen production from biomass, Fuel Processing Technology. Amsterdam, Netherlands, Elsevier B.V., 2006, 87: 461-472.
Ni M., Leung M.K.H. and Leung Y.C., Electrochemistry modeling of proton exchange membrane (PEM) water electrolysis for hydrogen production, Proceedings of 16th World Hydrogen Energy Conference (WHEC16). Lyon, France, 2006, CD-ROM.
Ni M., Leung M.K.H. and Leung Y.C., Prospect of solid oxide steam electrolysis for hydrogen production, Proceedings of 16th World Hydrogen Energy Conference (WHEC16). Lyon, France, 2006, CD-ROM.
Ni M., Leung M.K.H. and Leung Y.C., Technological development and prospect of alkaline fuel cells, Proceedings of 16th World Hydrogen Energy Conference (WHEC16). Lyon, France, 2006, CD-ROM.


Researcher : Ni Y

List of Research Outputs

Hu R., Soh A.K., Zheng G. and Ni Y., Micromagnetic modeling studies on the effects of stress on magnetization reversal and dynamic hysteresis, Journal of Magnetism and Magnetic Materials. Amsterdam, Netherlands, Elsevier, 2006, 301(2): 458-468.


Researcher : Poon CK

List of Research Outputs

Chow K.W., Zhang D. and Poon C.K., Three dimensional wave for water waves on finite depth:the Davey - Stewartson system, In: A. T. Chwang, M. H. Teng, D. T. Valentine, Advances in Engineering Mechanics: Reflections and Outlooks - in Honour of Professor Y. T. Wu. World Scientific, 2006, 111 - 116.
Poon C.K., MPhil Thesis, Numerical Simulation of Coupled Long Wave-short Wave System with a Mismatch in Group Velocities. Hong Kong, The University of Hong Kong, 2005, 1-110.


Researcher : Poon CK

List of Research Outputs

Chow K.W., Zhang D. and Poon C.K., Three dimensional wave for water waves on finite depth:the Davey - Stewartson system, In: A. T. Chwang, M. H. Teng, D. T. Valentine, Advances in Engineering Mechanics: Reflections and Outlooks - in Honour of Professor Y. T. Wu. World Scientific, 2006, 111 - 116.
Poon C.K., MPhil Thesis, Numerical Simulation of Coupled Long Wave-short Wave System with a Mismatch in Group Velocities. Hong Kong, The University of Hong Kong, 2005, 1-110.


Researcher : Qian H

List of Research Outputs

Li Y., Xu P., Qian H., Deng Q. and Wu J., Flow bifurcation due to opposing buoyancy in two vertically connected open cavities, International Journal of Heat and Mass Transfer. Elsevier, 2006, 49: 3298-3312.
Li Y., Ching W.H., Qian H. and Yuen P.L., Performance of air-conditioning systems in sars negative pressure isolation rooms, Proceedings of Asian Conference on Refrigeration and Air-conditioning ACRA. Gyeongju, Korea, 2006, 1: 213-220.
Qian H., Nielsen P.V., Li Y. and Hyldgaard C.E., Dispersion of exhalation pollutants in a two-bed hospital ward with a downward ventilation system, Proceedings of the 10th Internatioanl Conference on Indoor Air Quality and Climate, Indoor Air 2005. Beijing, China, 3541-3545.
Qian H., Li Y., Nielsen P.V., Hyldgaard C.E., Wong T.W. and Chwang A.T.Y., Dispersion of exhaled droplet nuclei in a two-bed hospital ward with three different ventilation systems, Indoor Air. Blackwell Munksgaard, 2006, 16: 111-128.
Qian H., Li Y., Nielsen P.V. and Huang X., Prediciting spatial distributin of infection risk of airborne transmission diseases in a hospital ward, Proceedings of Healthy Buildings 2006. Lisboa, Portugal, I: 131-136.


Researcher : Quadir MZ

List of Research Outputs

Duggan B.J., Quadir M.Z., Chen Q.Z., Shen K. and Tse Y.Y., Origin of the deformation microstructure in IF steel after medium cold rolling reductions, Proceedings of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 2): 1085-1090.
Quadir M.Z. and Duggan B.J., Recrystallization texture and microstructure formation in heavily rolled IF steel, Proceedings of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 1): 489-494.


Researcher : Sainsbury MG

List of Research Outputs

Masti R.S. and Sainsbury M.G., Vibration damping of cylindrical shells partially coated with a constrained viscoelastic treatment having a standoff layer, Thin-Walled Structures. Elsevier Ltd., 2005, 43(9): 1355-1379.


Researcher : Savalani MM

List of Research Outputs

Gibson I., Cheung L.K., Chow S.P., Cheung W.L., Beh S.L., Savalani M.M. and Lee S.H., The Use Of Rapid Prototyping To Assist Medical Applications, Rapid Prototyping Journal. UK, Emerald Group Publishing Ltd., 2006, 12: 53-58.


Researcher : Shek CM

List of Research Outputs

Shek C.M., Grimshaw R.H.J., Ding E. and Chow K.W., Interactions of breathers and solitons of the extended Korteweg - de Vries equation, The 58th American Physical Society Division of Fluid Dynamics Meeting, Chicago, Illinois, USA. 2005.


Researcher : Shen G

List of Research Outputs

Duggan B.J., Shen G. and Xu Y.B., Deformation and recrystallisation of BCC Mg LI, Proceedings of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 1): 699-704.


Researcher : Shen K

List of Research Outputs

Duggan B.J., Quadir M.Z., Chen Q.Z., Shen K. and Tse Y.Y., Origin of the deformation microstructure in IF steel after medium cold rolling reductions, Proceedings of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 2): 1085-1090.


Researcher : Sheng N

List of Research Outputs

Sheng N. and Sze K.Y., Multi-region Trefftz boundary element method for fracture analysis in plane piezoelectricity, Computational Mechanics. 2006, 37: 381-393.
Sheng N., Sze K.Y. and Cheung Y.K., Trefftz solutions for piezoelectricity by Lekhnitskii's Formalism and boundary-collocation method, International Journal for Numerical Methods in Engineering. 2006, 65: 2113-2138.
Sze K.Y. and Sheng N., Polygonal finite element method for nonlinear constitutive modeling of polycrystalline ferroelectrics, Finite Elements in Analysis & Design. 2005, 42: 107-129.


Researcher : Soh AK

Project Title:Toughening of ferroelectric ceramic nano-composites
Investigator(s):Soh AK
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):Soh AK
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:Mechanics of ultra-thin films and nanolaminates
Investigator(s):Soh AK
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:10/2003
Abstract:
N/A


Project Title:Interactive behaviour of carbon nanotubes with biological molecules
Investigator(s):Soh AK
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:02/2004
Completion Date:01/2007
Abstract:
To investigate the interactive behavior of carbon nanotubes (CNTs) with chemical or biological molecules in the aqueous environment by using the molecular dynamics (MD) simulation; to study the dispersion and separation of the aggregate of CNT assisted by single strand DNA (ssDNA); to study the specific or selective binding of peptides or proteins on CNT.


Project Title:Thermo-electro-chemical-mechanical multi-fields coupling behavior of intelligent biological materials
Investigator(s):Soh AK
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:01/2005
Completion Date:12/2006
Abstract:
Along with the development of modern medicinal engineering and rehabilitation technology, intelligent biological materials, especially the piezoelectric biological materials, have been a great concern to the researchers working in the field of medicinal engineering. Its development will accelerate the industrial revolution of medicinal and robotic engineering. Fukada [1] has studied the piezoelectric properties of the biological macromolecular materials, and observed that their tensile piezoelectric constants were stable below the temperature of 200 deg. C. Fotiadis et al. [2] have studied the wave propagation in the piezoelectric human long bone. An analytical solution for cylindrical magnetic piezoelectric long bones has been obtained by Ei-Naggar et al. [3]. Silva et al. [4] have measured the piezoelectric properties of collagen-hydroxyapatite films. Ahmed and Abd-Alla [5] have studied wave propatation in long bones with cavity on the basis of ref. [3]. Bocha et al. [6] have studied the biocompatibility of anionic collagen matrix as scaffold for bone healing. Guzelsu [7] and Johnson [8] have proposed models for dry bone cantilever subjected to an end load. By means of linear piezoelectric theory, Gjelsvik [9] has described the remodeling of piezoelectric bone. Williams et al. [10] explained the bending of piezoelectric bone cantilever by the strain gradient theory. Demiray [11] provided a general description for remodeling of bones. Aschero et al. [12- 13] have studied the statistical characterization of piezoelectric coefficients in cow bone. Xu [14] has proven that the piezoelectric effect of cartilage was due to the piezoelectricity of the helix polypeptide chains. Feng et al. [15] have studied the promotion of osteogenesis by a piezoelectric biological ceramic. To-date, the research outputs were mainly on the measurement of piezoelectric properties of bones and the theory for some special problems, and the existing theoretical results have no experimental data to compare with. Furthermore, the chemical potential corresponding to the cause of piezoelectric biological evolution has yet to be studied. It is important to note that the thermoelectroelastic effect and the chemical potential cannot be neglected in studying the properties of piezoelectric biological materials. However, at present there are no thermo-electro-mechanical-chemical multi-fields coupling theories for the study of piezoelectric biological materials. Therefore, it is important to carry out basic research on the study of the mechanism of multi-fields coupling. REFERENCES [1] Fukada E, Piezoelectricity of Biopolymers, Biorheology, 32, 593-609, 1995. [2] Fotiadis DI, Foutsitzi G, Massalas CV, Wave propagation in human long bones of arbitrary cross-section, Int. J. Eng. Sci., 38, 1553-1591, 2000. [3] El-Naggar AM, Abd-Alla AM, Mahmoud SR, Analytical solution of electro-mechanical wave propagation in long bones, Appl. Math. Comput., 119, 77-98, 2001. [4] Silva CC, et al, Collagen-hydroxyapatite films: piezoelectric properties, Mat. Sci. Eng., B86, 210-218, 2001. [5] Ahmed SM, Abd-Alla AM, Electromechanical wave propagation in a cylindrical poroelastic bone with cavity, Appl. Math. Comput., 133, 257-286, 2002. [6] Rocha LB, Goissis G, Rossi MA, Biocompatibility of anionic collagen matrix as scaffold for bone healing, Biomaterials, 23, 449-456, 2002. [7] Guzelsu N, A piezoelectric model for dry bone tissue, J. Biomechanics, 11, 257-267, 1978. [8] Johnson MW, Williams WS and Gross D, Ceramic models for piezoelectricity in dry bone, J. Biomechanics, 13, 565-573, 1980. [9] Gjelsvik A, Bone remodeling and piezoelectricity—I, J. Biomechanics, 6, 69-77, 1973. [10] Williams WS and Breger L, Analysis of stress distribution and piezoelectric response in cantilever bending of bone and tendon, Ann. N.Y. Acad. Sci., 238, 121-130, 1974. [11] Demiray H, Electro-Mechanical remodeling of bones, Int. J. Eng. Sci., 21, 1117-1126, 1983. [12] Aschero G, et al, Converse piezoelectric effect detected in fresh cow femur bone, J. Biomechanics, 29, 1169-1174, 1996. [13] Aschero G, Gizdulich P, Mango F, Statistical characterization of piezoelectric coefficient d23 in cow bone , J. Biomechanics, 32, 573-577, 1999. [14] Xu JZ, Soliton dynamics in the helix polypeptide chains, Chaos Solitons & Fractals, 11, 779-790, 2000. [15] Feng JP, Yuan HP, Zhang XD, Promotion of osteogenesis by a piezoelectric biological ceramic, Biomaterials, 18, 1531-1534, 1997.


Project Title:Thermo-elastic behavior and properties of micro- and nano-oscillators
Investigator(s):Soh AK
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2005
Abstract:
N/A


Project Title:Thermo-elastic behavior and properties of micro- and nano-oscillators
Investigator(s):Soh AK
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:Design and development of ultra-light smart lattice composite materials and structures
Investigator(s):Soh AK
Department:Mechanical Engg
Source(s) of Funding:Incentive Award for RGC CERG Fundable But Not Funded Projects
Start Date:07/2005
Completion Date:06/2006
Abstract:
N/A


Project Title:Modeling and Analysis of the Electromagnetic Behavior of Left-handed Materials
Investigator(s):Soh AK
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] Shelby, R.A., Smith, D.R. and Schultz, S., Experimental verification of a negative index of refraction, Science, 292, 77-79, 2001. [9] Markoš, P. and Soukoulis, C.M., Numerical studies of left-handed materials and arrays of split ring resonators, Phys. Rev. E, 65, 036622, 2002. [10] Li, K., McLean, S.J., Greegor, R.B., Parazzoli, C.G. and Tanielian, M.H., Free-space focused-beam characterization of left-handed materials, Appl. Phys. Lett., 82, 2535-2537, 2003. [11] Ziolkowski, R.W. and Heyman, E., Wave propagation in media having negative permittivity and permeability, Phys. Rev. E, 64, 056625, 2001. [12] Smith, D.R., Schultz, S., Markoš, P. and Soukoulis, C.M., Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients, Phys. Rev. B, 65, 195104, 2002. [13] Simovski, C.R., Tretyakov, S.A. and Sochava, A.A., Antenna model for conductive Omega particles, J. Electromagnetic Waves Appl., 11(11), 1509-1530, 1997. [14] Simovski, C.R. and Sauviac, B., Toward creating isotropic microwave composites with negative refraction, Radio Science, 39, RS2014, 2004. [15] Huangfu, J.T. et. al., Experimental confirmation of negative refractive index of a metamaterial composed of Ω-like metallic patterns, Appl. Phys. Lett., 84, 1537-1539, 2004. [16] Chui, S.T. and Hu, L.B., Theoretical investigation on the possibility of preparing left-handed materials in metallic magnetic granular composites, Physical Review B, 65, 144407, 2002. [17] Podolskiy V.A., Plasmon modes and negative refraction in metal nanowire composites, Optics Express, 11, 735-745, 2003.


List of Research Outputs

Guo X.H., Fang D.N., Soh A.K., Kim H.C. and Lee J.J., Analysis of piezoelectric ceramic multilayer actuators based on an electro-mechanical coupled meshless method, Acta Mechanica Sinica. Beijing, China, 2006, 22(1): 34-39.
Hu R., Soh A.K., Zheng G. and Ni Y., Micromagnetic modeling studies on the effects of stress on magnetization reversal and dynamic hysteresis, Journal of Magnetism and Magnetic Materials. Amsterdam, Netherlands, Elsevier, 2006, 301(2): 458-468.
Lee K.L. and Soh A.K., Effects of electric fatigue on piezoelectric ceramics, Key Engineering Materials. Zurich-Uetikon, Switzerland, Trans Tech Publications Ltd., 2006, 306-308, Part 1-2: 91-96.
Lee K.L., Soh A.K., Wang X.X. and Kwok K.W., Mechanical properties of ferroelectric ceramic nanocomposites, International Journal of Nanoscience. Singapore, World Scienctific Publishing Company, 2006, 4(4): 607-613.
Li F.X., Fang D.N. and Soh A.K., Theoretical saturated domain-orientation states in ferroelectric ceramics, Scripta Materialia. Oxford, England, Elsevier Ltd., 2006, 54(7): 1241-1246.
Liu J.J., Zhou Y.C., Soh A.K. and Li J.Y., Engineering domain configurations for enhanced piezoelectricity in barium titanate single crystals, Applied Physics Letters. New York, U.S.A., American Institute of Physics, 2006, 88(3): 032904.
Liu J.X., Soh A.K. and Fang D.N., A moving dislocation in a magneto-electro-elastic solid, Mechanics Research Communications. Oxford, England, Elsevier Ltd., 2005, 32(5): 504-513.
Ni Y., He L. and Soh A.K., Three-dimensional phase field simulation for surface roughening of heteroepitaxial films with elastic anisortropy, Journal of Crystal Growth. Amsterdam, Netherlands, Elsevier B.V., 2005, 284(1-2): 281-292.
Soh A.K., Lee K.L. and Fang D.N., Experimental Studies of Piezoelectric/Ferroelectric and Soft Ferromagnetic Materials with Defects, Proceedings of the Advanced Materials Development & Performance Conference 2005. Auckland, New Zealand.
Soh A.K. and Liu J.X., Interfacial debonding of a circular inhomogeneity in piezoelectric-piezomagnetic composites under anti-plane mechanical and in-plane electromagnetic loading, Composites Science and Technology. Oxford, England, Elsevier Ltd., 2005, 65(9): 1347-1353.
Soh A.K. and Liu J.X., Interfacial shear horizontal waves in a piezoelectric-piezomagnetic bi-material, Philosophical Magazine Letters. Oxon, England, Taylor & Francis, 2006, 86(1): 31-35.
Soh A.K. and Liu J.X., On the constitutive equations of magnetoelectroelastic solids, Journal of Intelligent Material Systems and Structures. London, England, Sage Publications, 2005, 16(7-8): 597-602.
Soh A.K., Song Y.C. and Ni Y., Phase field simulations of hysteresis and butterfly loops in ferroelectrics subjected to electro-mechanical coupled loading, Journal of the American Ceramic Society. Oxon, England, The American Ceramic Society, 2006, 89(2): 652-661.
Song Y. and Soh A.K., Phase field simulations of hysteresis and butterfly loops in ferroelectrics subjected to electro-mechanical coupled loading, Proceedings of ICMAT & IUMRS-ICAM 2005. Singapore.
Srinivas S., Li J.Y., Zhou Y.C. and Soh A.K., The effective magnetoelectroelastic moduli of matrix-based multiferroic composites, Journal of Applied Physics. New York, U.S.A., American Institute of Physics, 2006, 99(4): 043905.
Sun Y.X., Fang D.N. and Soh A.K., Thermoelastic damping in micro-beam resonators, International Journal of Solids and Structures. Oxford, England, Elsevier Ltd., 2006, 43(10): 3213-3229.
Sun Z.H., Wang X.X., Soh A.K. and Wu H.A., On stress calculations in atomistic simulations, Modelling and Simulation in Materials Science and Engineering. Bristol, England, IOP Publishing Ltd., 2006, 14(3): 423-431.
Yang J.S., Mao S.X., Yan K. and Soh A.K., Size effect on the electromechanical coupling factor of a thin piezoelectric film due to a nonlocal polarization law, Scripta Materialia. Oxford, England, Elsevier, 2006, 54(7): 1281-1286.
Zhang Z.K., Fang D.N. and Soh A.K., A new criterion for domain-switching in ferroelectric materials, Mechanics of Materials. Amsterdam, Netherlands, Elsevier Ltd., 2006, 38(1-2): 25-32.
Zhang Z.K. and Soh A.K., Micromechanics predictions of the effective moduli of magnetoelectroelastic composite materials, European Journal of Mechanics A-Solids. Paris, France, Elsevier SAS, 2005, 24(6): 1054-1067.


Researcher : Song Y

List of Research Outputs

Song Y. and Soh A.K., Phase field simulations of hysteresis and butterfly loops in ferroelectrics subjected to electro-mechanical coupled loading, Proceedings of ICMAT & IUMRS-ICAM 2005. Singapore.


Researcher : Sultana N

List of Research Outputs

Sultana N. and Wang M., PHB- and PHBV-based osteoconductive composite Scaffolds produced through an emulsion freeze-drying process, Proceedings of the 10th Annual Conference on Ceramics, Cells and Tissues. Faenza, Italy, 2006, 51.


Researcher : Sumathy K

Project Title:An energy-efficient hybrid desiccant dehumidification and air conditioning system with new desiccant materials
Investigator(s):Sumathy K, Wang R.Z.
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:12/2003
Completion Date:12/2005
Abstract:
To investigate the properties of new composite desiccant materials to be used as the working media for an efficient light-weight to compact desiccant dehumidifier; to develop a new desiccant-based dehumidifier integrated with an existing air conditioning system.


Project Title:An energy-efficient hybrid desiccant dehumidification and air conditioning system with new desiccant materials
Investigator(s):Sumathy K, Wang R.Z.
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:12/2003
Abstract:
N/A


List of Research Outputs

Ni M., Leung M.K.H., Leung Y.C. and Sumathy K., An analytical study of porosity effect on dye-sensitized solar cell performance, Solar Energy Materials & Solar Cells. Amsterdam, Netherlands, Elsevier B.V., 2006, 90: 1331-1344.
Ni M., Leung Y.C., Leung M.K.H. and Sumathy K., An overview of hydrogen production from biomass, Fuel Processing Technology. Amsterdam, Netherlands, Elsevier B.V., 2006, 87: 461-472.


Researcher : Sze KY

Project Title:Computational methods for meso-electromechanical analysis of ferroelectrics and ferroelectric devices
Investigator(s):Sze KY
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:Evaluation of Galerkin weak form for mesh-free approximants
Investigator(s):Sze KY
Department:Mechanical Engg
Source(s) of Funding:Small Project Funding
Start Date:11/2003
Completion Date:10/2005
Abstract:
To devleop a robust method to evaluate Galerkin weak form for meshfree approximants.


Project Title:Development of a rotation-free computational method for fabric drape simulation
Investigator(s):Sze KY
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:Development of a rotation-free computational method for fabric drape simulation
Investigator(s):Sze KY
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:12/2003
Abstract:
N/A


Project Title:Modelling and analysis of linear and geometric nonlinear adaptive structures.
Investigator(s):Sze KY
Department:Mechanical Engg
Source(s) of Funding:Incentive Award for RGC CERG Fundable But Not Funded Projects
Start Date:07/2005
Completion Date:06/2006
Abstract:
N/A


Project Title:Trefftz computational method for simulating domain switching in ferroelectric materials.
Investigator(s):Sze KY
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.


List of Research Outputs

Fan H., Xu J.G. and Sze K.Y., Energy-rate consideration in wafer bonding, Finite Elements in Analysis & Design. 2006, 42: 709-714.
Lo S.H., Cheung Y.K. and Sze K.Y., Analysis of transfer plate structures using 3D coupling element, 6th International Conference on Tall Buildings, 6-8 December, Hong Kong. 2005.
Sheng N. and Sze K.Y., Multi-region Trefftz boundary element method for fracture analysis in plane piezoelectricity, Computational Mechanics. 2006, 37: 381-393.
Sheng N., Sze K.Y. and Cheung Y.K., Trefftz solutions for piezoelectricity by Lekhnitskii's Formalism and boundary-collocation method, International Journal for Numerical Methods in Engineering. 2006, 65: 2113-2138.
Sze K.Y. and Sheng N., Polygonal finite element method for nonlinear constitutive modeling of polycrystalline ferroelectrics, Finite Elements in Analysis & Design. 2005, 42: 107-129.
Zhang X., Sze K.Y. and Ma S., An explicit material point finite element method for hyper-velocity impact, International Journal for Numerical Methods in Engineering. 2006, 66: 689-706.


Researcher : Sze WS

List of Research Outputs

Kou X., Tan S.T. and Sze W.S., Modeling complex heterogeneous objects with non-manifold heterogeneous cells, Computer-Aided Design. Elsevier Ltd., 2005, 38: 457-474.
Kou X., Tan S.T. and Sze W.S., Relation oriented modeling for heterogeneous object design, ASME 2005 International Design Engineering Technical Conference & Computers and Informaton in Engineering Conference. Long Beach, California, USA, ASME, 2005, CD-ROM: 6pp.


Researcher : Tam KW

List of Research Outputs

Tam K.W., PhD Thesis, Feature Based Reverse Engineering for Thermoforming Mould Design. Hong Kong, The University of Hong Kong, 2006, 1-168.


Researcher : Tan ST

Project Title:Layered manufacturing and redesign of compliant assemblies
Investigator(s):Tan ST
Department:Mechanical Engg
Source(s) of Funding:Competitive Earmarked Research Grants (CERG)
Start Date:12/2002
Completion Date:12/2006
Abstract:
The project is to investigate how and under what conditions 'compliant' assemblies can be built using layered manufacturing processes, and to construct algorithms for automatically merging those parts within the assembly that can be amalgamated without compromising on the strength and functionality of the assembly.


Project Title:Computer modeling of components made of multi heterogeneous materials
Investigator(s):Tan ST, Chen KZ
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):Tan ST
Department:Mechanical Engg
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:01/2005
Abstract:
N/A


Project Title:Heterogeneous solid modeling using materially defined geometric entities
Investigator(s):Tan ST
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.


List of Research Outputs

Chan C.K. and Tan S.T., Volume decomposition of CAD models for rapid prototyping technology, Rapid Prototyping Journal. Emerald Group Publishing Limitd, 2005, 11(4): 221-234.
Kou X. and Tan S.T., Data structure and algorithms for virtual protoyping of heterogeneous objects, Computer-Aided Design & Applications. Phuket, Thailand, 2006, 3(1-4): 59-67.
Kou X., Tan S.T. and Sze W.S., Modeling complex heterogeneous objects with non-manifold heterogeneous cells, Computer-Aided Design. Elsevier Ltd., 2005, 38: 457-474.
Kou X., Tan S.T. and Sze W.S., Relation oriented modeling for heterogeneous object design, ASME 2005 International Design Engineering Technical Conference & Computers and Informaton in Engineering Conference. Long Beach, California, USA, ASME, 2005, CD-ROM: 6pp.


Researcher : Tang B

List of Research Outputs

Tang B., PhD Thesis, Nanoindentation of Viscoelastic Materials. Hong Kong, The University of Hong Kong, 2005, 1-103.


Researcher : Tong HW

List of Research Outputs

Tong H.W., Wang M. and Lu W.W., Mechanical evaluation of pedical screws and rods made of a shape memory alloy, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 167.
Tong H.W. and Wang M., PHBV-based composite nanofibers for bone tissue engineering, Proceedings of the 10th Annual Conference on Ceramics, Cells and Tissues. Faenza, Italy, 2006, 50.


Researcher : Tse YY

List of Research Outputs

Duggan B.J., Quadir M.Z., Chen Q.Z., Shen K. and Tse Y.Y., Origin of the deformation microstructure in IF steel after medium cold rolling reductions, Proceedings of the 14th International Conference on Textures of Materials, MATERIALS SCIENCE FORUM. Switzerland, Trans Tech Publications, 2005, 495-497 (Part 2): 1085-1090.
Tse Y.Y. and Duggan B.J., Orientation imaging microscopy studies of recrystallization in interstitial-free steel, Metallurgical and Materials Transactions A. 2006, 37A: 1055-1064.


Researcher : Tsui KC

List of Research Outputs

Tsui K.C. and Li Y., Near-building vertical concentration profile of air pollutants in a densely populated and high-rise urban environment, Proceedings of Healthy Buildings 2006. Lisboa, Portugal, III: 43-148.


Researcher : Wang F

List of Research Outputs

Wang F., Chen K.Z., Feng X.Y. and Feng X.A., Optimization of the spraying process for multiphase perfect materials by means of virtual manufacturing, In: Cranfield University, U.K., Proceedings of International Conference of Manufacturing Research. 2005, C3-6.


Researcher : Wang L

Project Title:Development of integral theorems
Investigator(s):Wang L
Department:Mechanical Engg
Source(s) of Funding:Small Project Funding
Start Date:11/2002
Completion Date:10/2005
Abstract:
The project uses generalized functions as tools to develop an extensive set of 252 spatial integral theorems useful in physical and engineering analysis of many systems, those involving multiscale phenomena in particular.


Project Title:Multiplicity and stability of liquid flow and heat transfer in microchannels
Investigator(s):Wang L
Department:Mechanical Engg
Source(s) of Funding:Small Project Funding
Start Date:11/2003
Completion Date:10/2005
Abstract:
To visualize single-phase liquid flow and temperature fields numerically; to quantify when and to what extent electric double-layer (EDL), surface roughness, entrance and three dimensional transport effects become important in microchannels; to reconcile inconsistencies in the reported friction and heat transfer data in the literature; to develop reliable design tools of correlating relations for friction factors and heat transfer coefficients.


Project Title:Multiplicity and stability of forced convection in curved pipes: numerical simulation
Investigator(s):Wang L
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:02/2005
Completion Date:12/2006
Abstract:
To numerically study the developing, three-dimensional (3D) bifurcation-driven multiplicity and the stability of forced convection in curved circular pipes, a phenomenon widely observed from piping systems for various fluids, the thermal control system of the Alpha magnetic spectrometer of searching for antimatter and darkmatter to blood flows in the human arterial system.


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.


List of Research Outputs

Ai B., Wang L. and Liu L.G., Brownian micro-engines and refrigerators in a spatially periodic temperature field: Heat flow adn performances, Physics Letters A. Elsevier B.V., 2006, 352: 286-290.
Duan Q., Wang L. and Twizell E.H., A new weighted rational cubic interpolation and its approximation, Applied Mathematics and Computation. Elsevier Inc, 2005, 168: 990-1003.
Duan Q., Zhang Y., Wang L. and Twizell E.H., Region control and approximation of a weighted rational interpolating curves, Communications in Numerical Methods in Engineering. John Wiley & Sons, Ltd., 2006, 22: 41-53.
Liu F. and Wang L., Multiplicity of flow and heat transfer in tightly coiled ducts, In: (Progress in Computational Heat and Mass Transfer, Ed. By R. Bennacer, A.A. Mohamad, M.E. Ganaoui and J. Sicard), Proceedings of the 4th International Conference on Computational Heat and Mass Transfer. 2005, 165-167.
Wang L., Pang O. and Cheng L., Bifurcation and stability of forced convection in tightly coiled ducts: multiplicity, Chaos Solitons & Fractals. Elsevier Ltd., 2005, 26: 337-352.
Wang L., Pang O. and Cheng L., Bifurcation and stability of forced convection in tightly coiled dusts: stability, Chaos Solitons & Fractals. Elsevier Ltd., 2006, 27: 991-1005.
Wang L. and Yang T., Numerical simulation of multiplicity and stability of mixed convection in rotating curved ducts, International Journal of Rotating Machinery. 2005, 168-178.
Xu M. and Wang L., Dual-phase-lagging heat conduction based on Boltzmann transport equation, International Journal of Heat adn Mass Transfer. Elsevier Ltd., 2005, 48: 5616-5624.


Researcher : Wang M

List of Research Outputs

Chan Y.L., Wang M., Lu W.W. and Cheung K.M.C., An investigation into a surface-treated shape memory alloy for orthopaedic applications, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 163.
Chen Y., Mak A.F.T., Wang M. and Li J., Biomimetic coating of apatite/collagen composite on Poly(L-lactic acid) facilitates cell seeding, Proceedings of the 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. USA, IEEE, 2005, 4087-4090.
Chen Y., Mak A.F.T., Wang M. and Li J., Composite coating of bone-like apatite particles and collagen fibers on poly L-lactic acid formed through an accelerated biomimetic coprecipitation process, Journal of Biomedical Materials Research Part B: Applied Biomaterials. Wiley InterScience, 2006, 77B: 315-322.
Li H., Ngan A.H.W. and Wang M., Continuous strain bursts in crystalline and amorphous metals during plastic deformation by nanoindentation, Journal of Materials Research. Materials Research Society, 2005, 20: 3072-3081.
Liu Y. and Wang M., A novel composite material for bone tissue regeneration, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 165.
Liu Y. and Wang M., Developing a composite material for bone tissue repair, Proceedings of the 3rd Sino-Korea Symposium on Biomaterial & Nano-Biotechnology. Guangzhou, China, 2006, 24.
Liu Y. and Wang M., Manufacture and characterisation of a bioactive and biodegradable composite developed for bone tissue repair, Proceedings of the 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. USA, IEEE, 2005, 4103-4106.
Liu Y. and Wang M., Structure and properties of injection-moulded hydroxyapatite reinforced polyhydroxybutyrate, (Invited paper), Proceedings of the 3rd International Symposium on Apatite and Correlative Biomaterials. Wuhan, China, 2005, 76.
Sultana N. and Wang M., PHB- and PHBV-based osteoconductive composite Scaffolds produced through an emulsion freeze-drying process, Proceedings of the 10th Annual Conference on Ceramics, Cells and Tissues. Faenza, Italy, 2006, 51.
Tong H.W., Wang M. and Lu W.W., Mechanical evaluation of pedical screws and rods made of a shape memory alloy, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 167.
Tong H.W. and Wang M., PHBV-based composite nanofibers for bone tissue engineering, Proceedings of the 10th Annual Conference on Ceramics, Cells and Tissues. Faenza, Italy, 2006, 50.
Wang M., Expert Panel Member, Project Awarding Panel for Biophysics and Biomedical Engineering, NSFC, China, National Natural Science Foundation of China. China, 2005.
Wang M., Member of the Editorial Board, Journal of Materials Science: Materials in Medicine. Germany, Springer, 2006.
Wang M., Member of the Editorial Board, Surface and Coatings Technology. The Netherlands, Elsevier, 2006.
Wang M., Strategies for developing tissue engineering scaffolds of various materials, (Invited paper), Proceedings of the 10th Annual Conference on Ceramics, Cells and Tissues. Faenza, Italy, 2006, 17.
Wang M., Tissue engineering in orthopaedics: materials selection and scaffold fabrication, (Invited paper), Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 139-144.
Wu J.M., Wang M. and Osaka A., Biomimetic apatite formation on titania films produced via a low-temperature route, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 164.
Wu J.M., Wang M. and Osaka A., Biomimetic deposition of apatite on titania films prepared through various approaches, Proceedings of the 3rd International Symposium on Apatite and Correlative Biomaterials. Wuhan, China, 2005, 92.
Wu J.M., Wang M., Hayakawa S., Tsuru K. and Osaka A., Direct deposition of rutile layer on polymer substrates to induce bioactivity In Vitro, Key Engineering Materials. Switzerland, Trans Tech Publications, 2006, 309-311: 419-422.
Wu J.M., Wang M., Hayakawa S., Tsuru K. and Osaka A., In vitro bioactivity of hydrogen peroxide modified titanium: effects of surface morphology and film thickness, Key Engineering Materials. Switzerland, Trans Tech Publications, 2006, 309-311: 407-410.
Zhou W., Wang M. and Cheung W.L., Nanoemulsion synthesis of carbonated hydroxyapatite nanospheres for tissue engineering applications, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The University of Hong Kong, 2005, 166.
Zhou W., Wang M. and Cheung W.L., Synthesis of nanospheres of carbonated hydroxyapatite by nanoprecipitation, Proceedings of the 3rd International Symposium on Apatite and Correlative Biomaterials. China, Wuhan University of Technology, 2005, 107.


Researcher : Wang M

Project Title:Structure and properties of bone-like apatite formed on various biomaterials
Investigator(s):Wang M
Department:Engineering Faculty
Source(s) of Funding:Seed Funding for New Staff
Start Date:10/2003
Completion Date:09/2005
Abstract:
To induce the formation of bone-like apatite on metals and growing apatite on bioactive materials in vitro; to investigate main influencing factors for apatite formation; to study the structure and properties of apatite formed in vitro.


Project Title:An investigation into producing bioactive composite scaffolds using the selective laser sintering technique
Investigator(s):Wang M, Cheung WL
Department:Engineering Faculty
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:01/2005
Completion Date:06/2006
Abstract:
To investigate the feasibility of producing tricalcium phosphate (TCP) reinforced polyhydroxybutyrate (PHB) composite scaffolds for bone tissue engineering; to characterise the TE scaffolds procduced through structural analysis and mechanical testing; to study the bioactivity and biodegradation behaviour of composite scaffolds.


Project Title:Bioactive and biodegradable composites for bone tissue repair
Investigator(s):Wang M
Department:Engineering Faculty
Source(s) of Funding:Merit Award for RGC CERG Funded Projects
Start Date:12/2005
Abstract:
N/A


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.


List of Research Outputs

Chan Y.L., Wang M., Lu W.W. and Cheung K.M.C., An investigation into a surface-treated shape memory alloy for orthopaedic applications, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 163.
Chen Y., Mak A.F.T., Wang M. and Li J., Biomimetic coating of apatite/collagen composite on Poly(L-lactic acid) facilitates cell seeding, Proceedings of the 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. USA, IEEE, 2005, 4087-4090.
Chen Y., Mak A.F.T., Wang M. and Li J., Composite coating of bone-like apatite particles and collagen fibers on poly L-lactic acid formed through an accelerated biomimetic coprecipitation process, Journal of Biomedical Materials Research Part B: Applied Biomaterials. Wiley InterScience, 2006, 77B: 315-322.
Li H., Ngan A.H.W. and Wang M., Continuous strain bursts in crystalline and amorphous metals during plastic deformation by nanoindentation, Journal of Materials Research. Materials Research Society, 2005, 20: 3072-3081.
Liu Y. and Wang M., A novel composite material for bone tissue regeneration, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 165.
Liu Y. and Wang M., Developing a composite material for bone tissue repair, Proceedings of the 3rd Sino-Korea Symposium on Biomaterial & Nano-Biotechnology. Guangzhou, China, 2006, 24.
Liu Y. and Wang M., Manufacture and characterisation of a bioactive and biodegradable composite developed for bone tissue repair, Proceedings of the 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. USA, IEEE, 2005, 4103-4106.
Liu Y. and Wang M., Structure and properties of injection-moulded hydroxyapatite reinforced polyhydroxybutyrate, (Invited paper), Proceedings of the 3rd International Symposium on Apatite and Correlative Biomaterials. Wuhan, China, 2005, 76.
Sultana N. and Wang M., PHB- and PHBV-based osteoconductive composite Scaffolds produced through an emulsion freeze-drying process, Proceedings of the 10th Annual Conference on Ceramics, Cells and Tissues. Faenza, Italy, 2006, 51.
Tong H.W., Wang M. and Lu W.W., Mechanical evaluation of pedical screws and rods made of a shape memory alloy, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 167.
Tong H.W. and Wang M., PHBV-based composite nanofibers for bone tissue engineering, Proceedings of the 10th Annual Conference on Ceramics, Cells and Tissues. Faenza, Italy, 2006, 50.
Wang M., Expert Panel Member, Project Awarding Panel for Biophysics and Biomedical Engineering, NSFC, China, National Natural Science Foundation of China. China, 2005.
Wang M., Member of the Editorial Board, Journal of Materials Science: Materials in Medicine. Germany, Springer, 2006.
Wang M., Member of the Editorial Board, Surface and Coatings Technology. The Netherlands, Elsevier, 2006.
Wang M., Strategies for developing tissue engineering scaffolds of various materials, (Invited paper), Proceedings of the 10th Annual Conference on Ceramics, Cells and Tissues. Faenza, Italy, 2006, 17.
Wang M., Tissue engineering in orthopaedics: materials selection and scaffold fabrication, (Invited paper), Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 139-144.
Wu J.M., Wang M. and Osaka A., Biomimetic apatite formation on titania films produced via a low-temperature route, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The Chinese University of Hong Kong, 2005, 164.
Wu J.M., Wang M. and Osaka A., Biomimetic deposition of apatite on titania films prepared through various approaches, Proceedings of the 3rd International Symposium on Apatite and Correlative Biomaterials. Wuhan, China, 2005, 92.
Wu J.M., Wang M., Hayakawa S., Tsuru K. and Osaka A., Direct deposition of rutile layer on polymer substrates to induce bioactivity In Vitro, Key Engineering Materials. Switzerland, Trans Tech Publications, 2006, 309-311: 419-422.
Wu J.M., Wang M., Hayakawa S., Tsuru K. and Osaka A., In vitro bioactivity of hydrogen peroxide modified titanium: effects of surface morphology and film thickness, Key Engineering Materials. Switzerland, Trans Tech Publications, 2006, 309-311: 407-410.
Zhou W., Wang M. and Cheung W.L., Nanoemulsion synthesis of carbonated hydroxyapatite nanospheres for tissue engineering applications, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The University of Hong Kong, 2005, 166.
Zhou W., Wang M. and Cheung W.L., Synthesis of nanospheres of carbonated hydroxyapatite by nanoprecipitation, Proceedings of the 3rd International Symposium on Apatite and Correlative Biomaterials. China, Wuhan University of Technology, 2005, 107.


Researcher : Wang Q

List of Research Outputs

Wang Q., Lam J., Xu S. and Zhang H., Delay-dependent g-suboptimal H¥ model reduction for neutral systems with time-varying delays, Journal of Dynamic Systems, Measurement and Control. ASME, 2006, 128(2): 394-399.
Wang Q. and Lam J., H¥ model approximation for discrete-time markovian jump systems with mode-dependent time delays, Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference 2005. Seville, Spain, 6122-6126.
Xu H., Zou Y., Xu S., Lam J. and Wang Q., H¥ model reduction of 2-D singular roesser model, Multidimensional Systems and Signal Processing. Springer Science+Business Media, 2005, 16(3): 285-304.


Researcher : Wei F

List of Research Outputs

Wei F., PhD Thesis, A Study on the Improvement of Marine Diesel Engine Transient Performance by Means of Injection. Hong Kong, The University of Hong Kong, 2005, 1-130.


Researcher : Wo PC

List of Research Outputs

Ngan A.H.W. and Wo P.C., Delayed plasticity in nanoindentation of annealed crystals, Philosophical Magazine. Taylor & Francis, 2006, 86: 1287-1304.
Ngan A.H.W., Zuo L. and Wo P.C., Probabilistic nature of the nucleation of dislocations in an applied stress field, Scripta Materialia. Elsevier, 2006, 54: 589-593.
Ngan A.H.W., Zuo L. and Wo P.C., Size dependence and stochastic nature of yield strength of micron-sized crystals: a case study on Ni3A1, Proceedings of the Royal Society of London A. London, U.K., The Royal Society, 2006, 462: 1661-1681.
Wo P.C., Ph.D. Thesis, An Investigation of the Deformation Behaviour of Ni3Al Using Nanoindentation and Nanoscratch Methods. Hong Kong, The University of Hong Kong, 2005, 1-124.
Wo P.C., Ngan A.H.W. and Chiu Y.L., TEM measurement of nanoindentation plastic zones in Ni3Al, Scripta Materialia. Elsevier, 2006, 55: 557-560.


Researcher : Wo PC

List of Research Outputs

Ngan A.H.W. and Wo P.C., Delayed plasticity in nanoindentation of annealed crystals, Philosophical Magazine. Taylor & Francis, 2006, 86: 1287-1304.
Ngan A.H.W., Zuo L. and Wo P.C., Probabilistic nature of the nucleation of dislocations in an applied stress field, Scripta Materialia. Elsevier, 2006, 54: 589-593.
Ngan A.H.W., Zuo L. and Wo P.C., Size dependence and stochastic nature of yield strength of micron-sized crystals: a case study on Ni3A1, Proceedings of the Royal Society of London A. London, U.K., The Royal Society, 2006, 462: 1661-1681.
Wo P.C., Ph.D. Thesis, An Investigation of the Deformation Behaviour of Ni3Al Using Nanoindentation and Nanoscratch Methods. Hong Kong, The University of Hong Kong, 2005, 1-124.
Wo P.C., Ngan A.H.W. and Chiu Y.L., TEM measurement of nanoindentation plastic zones in Ni3Al, Scripta Materialia. Elsevier, 2006, 55: 557-560.


Researcher : Xie X

List of Research Outputs

Xie X. and Li Y., How far respiratory droplets move in indoor environments, Proceedings of Healthy Buildings 2006. Lisboa, Portugal, I: 309-314.
Xie X., Li Y., Zhang T. and Fang H., Survival of bacteria in evaporating droplets deposited on a teflon-coated surface, Proceedings of Healthy Buildings 2006. Lisboa, Portugal, II: 381-386.


Researcher : Xiong J

List of Research Outputs

Boukas E.K., Xu S., Lam J. and Xiong J., Robust stabilization of singular stochastic systems with delays, IFAC World Congress 2005. Prague, Czech Republic, CD-ROM: 6pp.
Xiong J. and Lam J., Fixed-order robust H¥ filter design for markovian jump systems with uncertain switching probabilities, IEEE Transactions on Signal Processing. IEEE, 2006, 54(4): 1421-1430.
Xiong J. and Lam J., Robust H¥ control of markovian jump linear systems with uncertain switching probabilities, IFAC World Congress 2005. Prague, Czech Republic, CD-ROM: 6pp.
Xiong J. and Lam J., Stabilization of discrete-time Markovian jump linear systems via time-delayed controllers, Automatica. Elsevier Ltd., 2006, 42(5): 747-753.


Researcher : Yan K

List of Research Outputs

Yang J.S., Mao S.X., Yan K. and Soh A.K., Size effect on the electromechanical coupling factor of a thin piezoelectric film due to a nonlocal polarization law, Scripta Materialia. Oxford, England, Elsevier, 2006, 54(7): 1281-1286.


Researcher : Yang L

List of Research Outputs

Yang L., Li Y., Zhang G.Q. and Chen Y.M., Dependence of CFD predictions on initial conditions for turbulent indoor airflows and pollutant spread, Proceedings of the 10th International Conference on Indoor Air Quality and Climate. Beijing, China, Indoor Air 2005, 2005, III: 1690-2695.
Yang L., Xu P. and Li Y., Nonlinear dynamic analysis of natural ventilation in a two-zone building: Part A - Theoretical analysis, HVAC&R Research. 2006, 12(2): 231-256.
Yang L., Xu P., Li Y. and Zhang G., Nonlinear dynamic analysis of natural ventilation in a two-zone building: Part B-CFD simulations, HVAC&R Research. 2006, 12(2): 257-278.


Researcher : Yeung CW

List of Research Outputs

Chan B.P., Leung M.K.H., Yeung C.W., Li J., Mo I. and Chan G.C.F., A novel 3-dimensiona culture system for human mesenchymal stem cells, International Society for Stem Cell Research 4th Annual Meeting. Toronto, Ontario, Canada, 2006, 98.


Researcher : Yin X

List of Research Outputs

Yin X., Chang J., Wang J.F., Fu Y., Wu C.Z. and Leung Y.C., Methanol synthesis from biomass derived syngas, Acta Energiae Solaris Sinica. Beijing, China, China Solar Energy Society, 2005, 26: 518-522.


Researcher : Yu X

List of Research Outputs

Yu X. and Chwang A.T.Y., Computational simulation on flows in stenosed carotid arteries, Proceedings of the Second Asian Pacific Conference on Biomechanics (APB-2005). 2005, CD-ROM: 2pp.


Researcher : Zhang D

List of Research Outputs

Chow K.W., Zhang D. and Poon C.K., Three dimensional wave for water waves on finite depth:the Davey - Stewartson system, In: A. T. Chwang, M. H. Teng, D. T. Valentine, Advances in Engineering Mechanics: Reflections and Outlooks - in Honour of Professor Y. T. Wu. World Scientific, 2006, 111 - 116.
Ng C.O., Zhang X. and Zhang D., On the oscillatory and mean motions induced by waves propagating in a thin viscoelastic layer, The Second Jiangsu-Hong Kong Forum on Mechanics and Its Application, Nanjing, China, May 27-28. Nanjing, China, Jiangsu Society of Theoretical and Applied Mechanics, 2006, 3pp.


Researcher : Zhang X

List of Research Outputs

Ng C.O. and Zhang X., Mechanics of Water Waves over a Viscoelastic Mud Layer, Invited Presentation at ISOPE 2006 - The 16th International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. 2006.
Ng C.O. and Zhang X., Mechanics of water waves over a viscoelastic mud layer, Proceedings of the Sixteenth (2006) International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. California, USA, ISOPE, 2006, 702-708.
Ng C.O., Zhang X. and Zhang D., On the oscillatory and mean motions induced by waves propagating in a thin viscoelastic layer, The Second Jiangsu-Hong Kong Forum on Mechanics and Its Application, Nanjing, China, May 27-28. Nanjing, China, Jiangsu Society of Theoretical and Applied Mechanics, 2006, 3pp.
Zhang X., Chen K.Z. and Feng X.A., A new design method for components made of a multiphase perfect material, In: Cranfield University, U.K., Proceedings of International Conference of Manufacturing Research. 2005, B3-6.
Zhang X. and Ng C.O., Mass transport in water waves over a thin layer of viscoelastic mud, Abstract 351, USNCTAM’06, The 15th U.S. National Congress on Theoretical and Applied Mechanics, Boulder, Colorado, USA, June 25-30. Boulder, USA, University of Colorado, 2006, 1pp.
Zhang X. and Ng C.O., Mud-wave interaction: a viscoelastic model, China Ocean Engineering. Beijing, China, China Ocean Press, 2006, 20(1): 15-26.
Zhang X. and Ng C.O., On the oscillatory and mean motions due to waves in a thin viscoelastic layer, Wave Motion. Amsterdam, Netherlands, Elsevier Science B.V., 2006, 43(5): 387-405.


Researcher : Zhang X

List of Research Outputs

Ng C.O. and Zhang X., Mechanics of Water Waves over a Viscoelastic Mud Layer, Invited Presentation at ISOPE 2006 - The 16th International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. 2006.
Ng C.O. and Zhang X., Mechanics of water waves over a viscoelastic mud layer, Proceedings of the Sixteenth (2006) International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. California, USA, ISOPE, 2006, 702-708.
Ng C.O., Zhang X. and Zhang D., On the oscillatory and mean motions induced by waves propagating in a thin viscoelastic layer, The Second Jiangsu-Hong Kong Forum on Mechanics and Its Application, Nanjing, China, May 27-28. Nanjing, China, Jiangsu Society of Theoretical and Applied Mechanics, 2006, 3pp.
Zhang X., Chen K.Z. and Feng X.A., A new design method for components made of a multiphase perfect material, In: Cranfield University, U.K., Proceedings of International Conference of Manufacturing Research. 2005, B3-6.
Zhang X. and Ng C.O., Mass transport in water waves over a thin layer of viscoelastic mud, Abstract 351, USNCTAM’06, The 15th U.S. National Congress on Theoretical and Applied Mechanics, Boulder, Colorado, USA, June 25-30. Boulder, USA, University of Colorado, 2006, 1pp.
Zhang X. and Ng C.O., Mud-wave interaction: a viscoelastic model, China Ocean Engineering. Beijing, China, China Ocean Press, 2006, 20(1): 15-26.
Zhang X. and Ng C.O., On the oscillatory and mean motions due to waves in a thin viscoelastic layer, Wave Motion. Amsterdam, Netherlands, Elsevier Science B.V., 2006, 43(5): 387-405.


Researcher : Zhang X

List of Research Outputs

Ng C.O. and Zhang X., Mechanics of Water Waves over a Viscoelastic Mud Layer, Invited Presentation at ISOPE 2006 - The 16th International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. 2006.
Ng C.O. and Zhang X., Mechanics of water waves over a viscoelastic mud layer, Proceedings of the Sixteenth (2006) International Offshore and Polar Engineering Conference, San Francisco, USA, May 28-June 2. California, USA, ISOPE, 2006, 702-708.
Ng C.O., Zhang X. and Zhang D., On the oscillatory and mean motions induced by waves propagating in a thin viscoelastic layer, The Second Jiangsu-Hong Kong Forum on Mechanics and Its Application, Nanjing, China, May 27-28. Nanjing, China, Jiangsu Society of Theoretical and Applied Mechanics, 2006, 3pp.
Zhang X., Chen K.Z. and Feng X.A., A new design method for components made of a multiphase perfect material, In: Cranfield University, U.K., Proceedings of International Conference of Manufacturing Research. 2005, B3-6.
Zhang X. and Ng C.O., Mass transport in water waves over a thin layer of viscoelastic mud, Abstract 351, USNCTAM’06, The 15th U.S. National Congress on Theoretical and Applied Mechanics, Boulder, Colorado, USA, June 25-30. Boulder, USA, University of Colorado, 2006, 1pp.
Zhang X. and Ng C.O., Mud-wave interaction: a viscoelastic model, China Ocean Engineering. Beijing, China, China Ocean Press, 2006, 20(1): 15-26.
Zhang X. and Ng C.O., On the oscillatory and mean motions due to waves in a thin viscoelastic layer, Wave Motion. Amsterdam, Netherlands, Elsevier Science B.V., 2006, 43(5): 387-405.


Researcher : Zhang Y

List of Research Outputs

Duan Q., Zhang Y., Wang L. and Twizell E.H., Region control and approximation of a weighted rational interpolating curves, Communications in Numerical Methods in Engineering. John Wiley & Sons, Ltd., 2006, 22: 41-53.


Researcher : Zheng G

Project Title:Experiment and simulation studies on the deformation mechanisms in nanocrystalline H.C.P. metals
Investigator(s):Zheng G
Department:Mechanical Engg
Source(s) of Funding:Seed Funding Programme for Basic Research
Start Date:10/2004
Completion Date:09/2006
Abstract:
To study the mechanical deformation mechanisms in nanocrystalline (nc) metals by experiments and computer simulations.


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:Merit Award for RGC CERG Funded Projects
Start Date:08/2005
Abstract:
N/A


Project Title:Atomistic Simulation Study on Deformation Mechanisms in Nanocrystalline H.C.P. Metals
Investigator(s):Zheng G, Li M
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.


List of Research Outputs

Hu R., Soh A.K., Zheng G. and Ni Y., Micromagnetic modeling studies on the effects of stress on magnetization reversal and dynamic hysteresis, Journal of Magnetism and Magnetic Materials. Amsterdam, Netherlands, Elsevier, 2006, 301(2): 458-468.
Zheng G., Deformation Mechanisms of Nanocrystalline Hexagonal Close-Packed Metals, Mater. Res. Soc. Symp. Proc. . 2006, 926E: 0319.
Zheng G., Effect of twins on plastic deformation of nanocrystalline cobalt, International Journal of Nanoscience . 2005, 4: 651.
Zheng G., Grain-size Effect on Plastic Flow in Nanocrystalline Cobalt by Atomistic Simulation, Acta Materialia . 2006, 54: 5200.
Zheng G., Phase transformation in nanocrystal solid solution, In: Ed by J. M. Howe, et.al., , Solid-Solid Phase Transformations in Inorganic Materials. TMS Publishing, 2005, 2: 925.


Researcher : Zhou W

List of Research Outputs

Zhou W., Wang M. and Cheung W.L., Nanoemulsion synthesis of carbonated hydroxyapatite nanospheres for tissue engineering applications, Proceedings of the International Symposium on Quality of Bone and Scaffold Materials Evaluated by microCT, pQCT and MRI. Hong Kong, The University of Hong Kong, 2005, 166.
Zhou W., Wang M. and Cheung W.L., Synthesis of nanospheres of carbonated hydroxyapatite by nanoprecipitation, Proceedings of the 3rd International Symposium on Apatite and Correlative Biomaterials. China, Wuhan University of Technology, 2005, 107.


Researcher : Zhu F

List of Research Outputs

Zhu F., Chen K.Z. and Feng X.A., Visualized CAD models of objects made of a multiphase perfect material, Advances in Engineering Software. Oxford, UK, Elsevier Science, 2006, 37: 20-31.


Researcher : Zuo L

List of Research Outputs

Ngan A.H.W., Zuo L. and Wo P.C., Probabilistic nature of the nucleation of dislocations in an applied stress field, Scripta Materialia. Elsevier, 2006, 54: 589-593.
Ngan A.H.W., Zuo L. and Wo P.C., Size dependence and stochastic nature of yield strength of micron-sized crystals: a case study on Ni3A1, Proceedings of the Royal Society of London A. London, U.K., The Royal Society, 2006, 462: 1661-1681.
Zuo L. and Ngan A.H.W., Molecular dynamics study on compressive yield strength in Ni3Al micro-pillars, Philosophical Magazine Letters. Taylor & Francis, 2006, 86(6): 355-365.


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