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Full-Text Articles in Engineering
Raman Study Of Element Doping Effects On The Superconductivity Of Mgb2, Wenxian Li, Yongqing Li, R H. Chen, Rong Zeng, S. X. Dou, M Y. Zhu, H M. Jin
Raman Study Of Element Doping Effects On The Superconductivity Of Mgb2, Wenxian Li, Yongqing Li, R H. Chen, Rong Zeng, S. X. Dou, M Y. Zhu, H M. Jin
Faculty of Engineering - Papers (Archive)
The influences of phonon frequency and unit cell volume on the superconductivity of element-doped MgB2 are discussed with reference to a Raman study on SiC, C, Mn, and Al-Ag-doped Mg-B materials. A phenomenon has been found in the doped samples, in that the phonon frequency changes to counteract the crystal lattice variation to keep the system stable within a Grüneisen parameter of 2.0–4.0. The chemical doping effects on phonon frequency and unit cell volume can be explained by the harmonicity-anharmonicity competition in the compounds. A decreased electronic density of states is responsible for the depression of superconductivity that is …
Effects Of Sintering Atmosphere On The Superconducting Properties Of Sic Doped Bulk Mgb2 Superconductor, Sihai Zhou, Alexey V. Pan, Yun Zhang, S. X. Dou
Effects Of Sintering Atmosphere On The Superconducting Properties Of Sic Doped Bulk Mgb2 Superconductor, Sihai Zhou, Alexey V. Pan, Yun Zhang, S. X. Dou
Faculty of Engineering - Papers (Archive)
A study was conducted to investigate the effects of the sintering atmosphere on the superconducting properties of SiC doped MgB2 superconductors. Four different purity Ar gases were chosen as the sintering atmosphere for making bulk samples. It was found that the impurities in the Ar gas resulted in different leves of MgO in the resultant MgB2 superconductors. Superconducting properties, such as the critical temperature (Tc), critical current density (Jc) and upper critical field (Hc2) were affected by the impurity phase inside the samples. Sample phase composition and morphology were analysed to explain the effect of the sintering atmosphere on the …
Effects Of C Substitution On The Pinning Mechanism Of Mgb2, Jianli Wang, Rong Zeng, Jung Ho Kim, Lin Lu, S. X. Dou
Effects Of C Substitution On The Pinning Mechanism Of Mgb2, Jianli Wang, Rong Zeng, Jung Ho Kim, Lin Lu, S. X. Dou
Faculty of Engineering - Papers (Archive)
The temperature and magnetic field of the critical current density of four selected pure and C-doped MgB2 samples have been investigated in detail and the flux pinning mechanism has been analyzed. It was found that the sintering temperature and the substitution of carbon can significantly modify the flux pinning mechanism. Below 30 K, the reduced field dependences of the reduced pinning force for all investigated samples were found to closely obey one scaling law, reflecting the presence of only one dominant pinning mechanism. A delta T-c pinning mechanism was found to be mainly responsible in pure MgB2 samples while the …
Effects Of Vertical Heterogeneity Of Soil Sediments On Seismic Soil Response, Srikanth Venkatesan, M Neaz Sheikh, Hing Ho Tsang, Nelson Lam
Effects Of Vertical Heterogeneity Of Soil Sediments On Seismic Soil Response, Srikanth Venkatesan, M Neaz Sheikh, Hing Ho Tsang, Nelson Lam
Faculty of Engineering - Papers (Archive)
Site effects are resulted from the non-linear filtering mechanisms within the soil sedimentary layers overlying bedrock. In contemporary design codes, site effects are taken into account by introducing different site factors for different site classes. The prescribed site classification systems are based on averaging shear wave velocity in the soil sediments. However, significant amplification of the seismic displacement demand may be developed from mechanisms which can result in resonance behaviour. In such situations, soil amplification cannot be determined accurately by considering the average shear wave velocity of the sediments alone. The effects of vertical heterogeneity in the soil sediments have …
Effects Of Operating Conditions On The Removal Of Trace Organic Contaminants By A Loose Nanofiltration Membrane, Long Nghiem, Stuart Khan
Effects Of Operating Conditions On The Removal Of Trace Organic Contaminants By A Loose Nanofiltration Membrane, Long Nghiem, Stuart Khan
Faculty of Engineering - Papers (Archive)
In recent years, there has been considerable research effort focusing on the removal of specific individual contaminants at trace level concentrations instead of the traditional surrogate, and often ill-defined, water quality indicators. The need for this more precise water quality characterisation has been driven by stricter environmental regulations and legislation, and the increasing need to utilise non-traditional water resources including reclaimed municipal wastewaters. Amongst several advanced technologies used for high quality water treatment, removal of trace contaminants by nanofiltration membranes has been investigated to a considerable extent. However, it is known that such membrane filtration processes tend not to operate …
Models Of Biological Effects Of Radiation In The Geant4 Toolkit, S Chauvie, Z Francis, S Guatelli, S Incerti, G Montarou, P Nieminen, M G. Pia
Models Of Biological Effects Of Radiation In The Geant4 Toolkit, S Chauvie, Z Francis, S Guatelli, S Incerti, G Montarou, P Nieminen, M G. Pia
Faculty of Engineering and Information Sciences - Papers: Part A
A project, named Geant4-DNA, is in progress to extend the Geant4 simulation toolkit to model the effects of radiation with biological systems at cellular and DNA level. The first component implemented in the first development cycle of the project describes the fractional survival of a population of cells irradiated with photons or charged particles. The software system developed provides the user the option to choose among a small set of alternative models for the calculation of mammalian cell survival after irradiation. The flexible design adopted makes the system open to further extension to implement other cell survival models available in …
Effects Of Tsunami On Coastal Ground Conditions And Appropriate Measures For Rail Track Rehabilitation, Buddhima Indraratna, Mohammad Hadi Khabbaz, A. Puswewala, W. Bandara
Effects Of Tsunami On Coastal Ground Conditions And Appropriate Measures For Rail Track Rehabilitation, Buddhima Indraratna, Mohammad Hadi Khabbaz, A. Puswewala, W. Bandara
Faculty of Engineering - Papers (Archive)
On boxing day, 26 December 2004, the largest earthquake for more than 4 decades, (magnitude 9.0) occurred between the Australian and Eurasian plates in the Indian Ocean (along the overly stressed Sunda trench) to the west of Aceh Province (Northern Sumatra). The quake triggered a series of waves that increased in height rapidly close to the shore (tsunami) spreading thousands of kilometers across the Bay of Bengal. In the Eastern and Southern coastal belt of Sri Lanka, the floodwaters reached almost 1 km inland, causing extensive damage to infrastructure and fatalities of unprecedented proportions. Widespread destruction included several kilometres of …
The Effects Of Oil Concentration And Droplet Diameter In Oil-In-Water Emulsion On Strip Rolling, Prabuono B. Kosasih, A. K. Tieu, Weihua Li, Cheng Lu
The Effects Of Oil Concentration And Droplet Diameter In Oil-In-Water Emulsion On Strip Rolling, Prabuono B. Kosasih, A. K. Tieu, Weihua Li, Cheng Lu
Faculty of Engineering - Papers (Archive)
A numerical scheme, which allows tracking of the concentration process within both the inlet and wok zones, has been developed. The scheme allowed us to calculate the rolling pressure and friction associated with the process for different emulsion’s oil concentrations, and oil droplets diameter, ds. Hence the intertwined effect of A,ds, ds and rolling speed on strip rolling parameters could be analyzed. The result shows that rapid concentration, which occurs in the inlet zone, increases the emulsion’s oil concentration sharply. This process effectively transforms the oil into the continuous phase of the emulsion. The analysis of the results also suggests …
Strength Of Concrete-Filled Steel Box Columns With Local Buckling Effects, Qing Quan Liang, Brian Uy, J. Y. Richard Liew
Strength Of Concrete-Filled Steel Box Columns With Local Buckling Effects, Qing Quan Liang, Brian Uy, J. Y. Richard Liew
Faculty of Engineering - Papers (Archive)
The key aspects and features of a nonlinear fiber element analysis method for predicting the strength and behavior of concrete-filled steel box columns with local buckling effects are discussed. The methods is quite useful in predicting the ultimate strengths and behavior of concrete slabs and can also be employed in the advanced analysis of composite frames.
Regional Differences In Pain Threshold And Tolerance Of The Transtibial Residual Limb: Including The Effects Of Age And Interface Material, Winson Lee, Ming Zhang, Arthur F. Mak
Regional Differences In Pain Threshold And Tolerance Of The Transtibial Residual Limb: Including The Effects Of Age And Interface Material, Winson Lee, Ming Zhang, Arthur F. Mak
Faculty of Engineering and Information Sciences - Papers: Part A
OBJECTIVES: To compare the pain threshold (the minimum pressure inducing pain) and pain tolerance (the maximum tolerable pressure) of different regions of the residual limbs of amputees by the indentation method and to evaluate the interface pressure distribution and distortion of the skin surface on indentation by finite element (FE) analysis. DESIGN: Crossover trial. SETTING: Rehabilitation engineering center. PARTICIPANTS: Eight transtibial amputees for indentation test and 1 for FE analysis. INTERVENTIONS: The load applied to the residual limbs using a Pelite or polypropylene indenter attached to a force transducer was increased until subjects could no longer tolerate the load. An …
Load Transfer Mechanics Between Trans-Tibial Prosthetic Socket And Residual Limb-Dynamic Effects, Xiaohong Jia, Ming Zhang, Winson Lee
Load Transfer Mechanics Between Trans-Tibial Prosthetic Socket And Residual Limb-Dynamic Effects, Xiaohong Jia, Ming Zhang, Winson Lee
Faculty of Engineering and Information Sciences - Papers: Part A
The effects of inertial loads on the interface stresses between trans-tibial residual limb and prosthetic socket were investigated. The motion of the limb and prosthesis was monitored using a Vicon motion analysis system and the ground reaction force was measured by a force platform. Equivalent loads at the knee joint during walking were calculated in two cases with and without consideration of the material inertia. A 3D nonlinear finite element (FE) model based on the actual geometry of residual limb, internal bones and socket liner was developed to study the mechanical interaction between socket and residual limb during walking. To …
An Investigation Into The Effects Of Heat Transfer On The Motion Of A Spherical Bubble, P J Harris, H Al-Awadi, Wee King Soh
An Investigation Into The Effects Of Heat Transfer On The Motion Of A Spherical Bubble, P J Harris, H Al-Awadi, Wee King Soh
Faculty of Engineering and Information Sciences - Papers: Part A
This paper investigates the effect of heat transfer on the motion of a spherical bubble in the vicinity of a rigid boundary. The effects of heat transfer between the bubble and the surrounding fluid, and the resulting loss of energy from the bubble, can be incorporated into the simple spherical bubble model with the addition of a single extra ordinary differential equation. The numerical results show that for a bubble close to an infiniterigid boundary there are significant differences in both the radius and Kelvin impulse of the bubble when the heat transfer effects are included.
Compiler Optimization And Ordering Effects On Vliw Code Compression, Montserrat Ros, Peter Sutton
Compiler Optimization And Ordering Effects On Vliw Code Compression, Montserrat Ros, Peter Sutton
Faculty of Engineering and Information Sciences - Papers: Part A
Code size has always been an important issue for all embedded applications as well as larger systems. Code compression techniques have been devised as a way of battling bloated code; however, the impact of VLIW compiler methods and outputs on these compression schemes has not been thoroughly investigated. This paper describes the application of single- and multipleinstruction dictionary methods for code compression to decrease overall code size for the TI TMS320C6xxx DSP family. The compression scheme is applied to benchmarks taken from the Mediabench benchmark suite built with differing compiler optimization parameters. In the single instruction encoding scheme, it was …
Zinc Doping Effects On The Structure, Transport And Magnetic Properties Of La0.7sr0.3mn1-Xznxo3 Manganite Oxide, E V. Sotirova-Haralambeva, Xiaolin Wang, Hua-Kun Liu, Tania M. Silver, Konstantin Konstantinov, Josip Horvat
Zinc Doping Effects On The Structure, Transport And Magnetic Properties Of La0.7sr0.3mn1-Xznxo3 Manganite Oxide, E V. Sotirova-Haralambeva, Xiaolin Wang, Hua-Kun Liu, Tania M. Silver, Konstantin Konstantinov, Josip Horvat
Australian Institute for Innovative Materials - Papers
The processing, microstructures and properties of La0.7Sr0.3Mn1−xZnxO3 perovskite manganite, with x=0, 0.1, 0.2, and 0.3 have been investigated. X-ray diffraction, scanning electron microscopy (SEM) and other characterisation methods were used to study the relations of microstructure and properties. The X-ray powder diffraction results show a single phase for the 0<x<0.3 region that confirms the zinc incorporation into the Mn site. The SEM images with magnification 1500× indicate that the studied system is a single phase. The transport measurements show decreasing of insulator to metal transition temperature, Tt, with increasing the zinc concentration on the Mn site, while the resistivity increases with …
Microscopic Treatment Of Substrate Effects On Linear And Quadratic Optical Response Of Model Langmuir-Blodgett Multilayers, Marc In Het Panhuis, R W. Munn
Microscopic Treatment Of Substrate Effects On Linear And Quadratic Optical Response Of Model Langmuir-Blodgett Multilayers, Marc In Het Panhuis, R W. Munn
Australian Institute for Innovative Materials - Papers
Microscopic calculations are reported of linear and quadratic nonlinear optical response in model Langmuir-Blodgett films on a substrate, which is treated by the method of images. The effect of the substrate is significant in the first two layers, and is greatest for tilted molecules with their head groups adjacent to the substrate. The main qualitative effect is to lower the symmetry relative to a free-standing film. Calculations for stearic acidfilms show that the substrate effect is most important for molecules with nonuniform response on a metallic substrate.