Daniel Hung-Kay Chow

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OBJECTIVE This study was performed to investigate the time-dependent responses of the intervertebral joint to static and vibrational loads. DESIGN A poroelastic finite element model was established to analyse the fluid flow, stress distribution and deformation of the intervertebral disc. BACKGROUND Long-term exposure to whole body vibration is highly(More)
Despite the fact that non-level walking is known to be important for prosthesis fitting, its clinical significance has not been investigated. In this study, the acceptable prosthesis alignment ranges of six subjects with transtibial amputation on level and non-level walking were determined and compared. With the aid of a recently developed alignment jig,(More)
This paper presents some installation and data analysis issues from an ongoing urban air temperature and humidity measurement campaign in Hangzhou and Ningbo, China. The location of the measurement sites, the positioning of the sensors and the harsh conditions in an urban environment can result in missing values and observations that are unrepresentative of(More)
Clinically, it is hard to achieve and reproduce prosthesis alignment at will during daily prosthesis fitting. A new alignment jig was designed and developed to facilitate quantification and prescription of prosthesis alignment for patellar-tendon-bearing (PTB) trans-tibial prostheses. The alignment jig provided instantaneous readings of the(More)
We have used reflection high-energy electron diffraction to study the surface periodicity of the growth front of lnAs/GalnSb strained-layer superlattices (SLSs). We found that the apparent surface lattice spacing reproducibly changed during layers which subsequent x-ray measurements indicated were coherently strained. Abrupt changes in the measured streak(More)
Superlattices consisting of combinations of Ill-V semiconductors with type II band alignments are of interest for infrared applications because their energy gaps can be made smaller than those of any 'natural' Ill-V compounds. Specifically, it has been demonstrated that both InSb/lnAs,Sb, I superlattices and Ga, _,ln,Sb/lnAs superlattices can possess energy(More)
At present, China is going through a rapid rate of mass urbanisation, and this poses a number of challenges for the building sector. On one hand, under new directives from the government, new buildings will have stricter energy requirements and existing buildings will also need to lower their rate of energy consumption, on another hand, the lifetime of(More)
We report the successful growth oflnAs/Ga 1 _ x Inx Sb strained-layer superlattices by molecularbeam epitaxy. The superlattices are grown on thick, strain-relaxed InAs or GaSb buffer layers on ( 100)-oriented GaAs substrates. A short-period, heavily strained superlattice at the GaAs interface is found to improve the structural quality of the buffer layer.(More)
We report an investigation of In,,,GacJ, As/AlAs resonant tunneling diodes designed for high speed switching applications. Experimental peak current densities are observed to increase with decreasing AlAs barrier thicknesses, in good agreement with a two band tunneling calculation, which includes the effects of strain and band bending. Swing voltages over(More)