Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 30 of 73
Full-Text Articles in Engineering
Dependence Of Magnetoelectric Properties On Sintering Temperature For Nano-Sic-Doped Mgb2/Fe Wires Made By Combined In Situ/Ex Situ Process, Wenxian Li, Rong Zeng, Jiazhao Wang, Y Li, S. X. Dou
Dependence Of Magnetoelectric Properties On Sintering Temperature For Nano-Sic-Doped Mgb2/Fe Wires Made By Combined In Situ/Ex Situ Process, Wenxian Li, Rong Zeng, Jiazhao Wang, Y Li, S. X. Dou
Faculty of Engineering - Papers (Archive)
Very fine nano-SiC particles (nm) were doped into a MgB2 superconductor. The influence of self-field supercurrent on the high-field performance of the nano-SiC-doped MgB2/Fe wires is discussed based on comparison of the critical current densities of the in situ processed nano-SiCdoped MgB2 wires and those of the nano-SiC-doped MgB2/Fe wires processed by the combination of in situ/ex situ methods.
Investigating The Effects Of Pounding For Inelastic Base Isolated Adjacent Buildings Under Earthquake Excitations, Mehmet Uz, Muhammad N. S Hadi
Investigating The Effects Of Pounding For Inelastic Base Isolated Adjacent Buildings Under Earthquake Excitations, Mehmet Uz, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
In this study, an investigation is carried out to analyse the earthquake induced pounding be-tween two insufficiently separated base isolated buildings considering the inelastic behaviour of the struc-tures’ response. The buildings are modelled as a four-story and a three-story system to simulate the structural behaviour. The resulting systems of second order constant coefficient equations are reformulated as a system of first order ordinary differential equations and solved using the ordinary differential equation solver of MATLAB. Numerical study revealed that pounding behaviour of the buildings has considerable influence on the behaviour of the lighter building causing substantial amplification of the response …
Development And Validation Of Calibration Methods For Discrete Element Modelling, Andrew Grima, Peter W. Wypych
Development And Validation Of Calibration Methods For Discrete Element Modelling, Andrew Grima, Peter W. Wypych
Faculty of Engineering - Papers (Archive)
Discrete element method (DEM) is proving to be a reliable and increasingly used tool to study and predict the behaviour of granular materials. Numerous particlescale mechanisms influence the bulk behaviour and flow of bulk materials. It is important that the relevant measurable input parameters for discrete element models bemeasured by laboratory equipment or determined by physical calibration experiments for rational results. This paper describes some of the bench-scale experiments that have been developed to calibrate the DEM simulations to reflect actual dynamic behaviour. Relevant parameters such as static and rolling coefficients of friction, coefficient of restitution and interparticle cohesion forces …
A Real-Time Measuring Technology For Studying Distortion Of Hydraulic Turbine Blade Castings During Heat Treatment Process, Hailiang Yu, Jinwu Kang, Gang Nie, Haimin Long, Xiaokun Hao, Tianyou Huang
A Real-Time Measuring Technology For Studying Distortion Of Hydraulic Turbine Blade Castings During Heat Treatment Process, Hailiang Yu, Jinwu Kang, Gang Nie, Haimin Long, Xiaokun Hao, Tianyou Huang
Faculty of Engineering - Papers (Archive)
During heat treatment process, the distortion behavior inevitably appears in hydraulic turbine blade castings. In this research, a technology was developed for real-time measurement of the distortion in hydraulic turbine blade castings at the still air cooling and forced air cooling stages during heat treatment process. The method was used to measure the distortion behavior at the cooling stages in both normalizing and tempering processes. At the normalization, the distortion at the blade corner near outlet side undergoes four stages with alternating bending along positive and negative directions. At the tempering stage, the distortion could be divided into two steps. …
Design Of Water Holding Bulkheads For Coal Mines, Verne Mutton, Alexander Remennikov
Design Of Water Holding Bulkheads For Coal Mines, Verne Mutton, Alexander Remennikov
Faculty of Engineering - Papers (Archive)
Water control has been and remains a fundamentally important aspect of underground coal mine design and operation worldwide. Mining in the vicinity of large bodies of water, below a worked out coal seam or under confined aquifer or abandoned water logged workings is always fraught with the possibility of the danger of inundation. Inrush control is now part the Fatal Hazard Protocols which is a risk based process in all operations. In modern Australian underground coal mines, in which panel layouts have been extended and production rates are approaching 10 Mtpa, there is much focus on the control of water …
Graphene V2o5 Nh2o Xerogel Composite Cathodes For Lithium Ion Batteries, Guodong Du, Kuok Hau Seng, Zaiping Guo, Jun Liu, Wenxian Li, D Z. Jia, Christopher D. Cook, Z Liu, Hua-Kun Liu
Graphene V2o5 Nh2o Xerogel Composite Cathodes For Lithium Ion Batteries, Guodong Du, Kuok Hau Seng, Zaiping Guo, Jun Liu, Wenxian Li, D Z. Jia, Christopher D. Cook, Z Liu, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
A layer structured V2O5·nH2O xerogel was synthesized via a simple green hydrothermal technique by dissolving commercial V2O5 powder in de-ionized water and hydrogen peroxide. Graphene–V2O5·nH2O xerogel composites were then prepared by mixing and filtration of as-prepared V2O5·nH2O xerogel and graphene in the desired ratio. The method is a cost effective and energy saving way to prepare nanostructured composites. Structure and morphology were investigated by X-ray diffraction, thermogravimetric analysis, field emission scanning electron microscopy, …
Review Of Gas Emission Prediction And Control Methods For Multi-Seam Mining In Chinese Coal Mines, Zhongwei Wang, Ting Ren, Lei Zhang
Review Of Gas Emission Prediction And Control Methods For Multi-Seam Mining In Chinese Coal Mines, Zhongwei Wang, Ting Ren, Lei Zhang
Faculty of Engineering - Papers (Archive)
In China, the practice of multi-seam mining with high gas emission rates is common, and many coal mines are suffering from major gas management issues. To deal with these problems, empirical formulas for gas emission prediction and gas control methods suitable for site-specific conditions are developed. Specifically, the statistical method and split–source-method are widely used for gas emission prediction. In addition to ventilation, various gas control methods, including cross-measure boreholes, directional long-holes, dedicated roadways and surface goaf wells are used for gas drainage. Techniques for integrated extraction of coal and coal seam gas have been developed in these coal mines, …
A Decision Support Methodology For Remediation Planning Of Concrete Bridges, Maria Rashidi, Brett P. Lemass
A Decision Support Methodology For Remediation Planning Of Concrete Bridges, Maria Rashidi, Brett P. Lemass
Faculty of Engineering - Papers (Archive)
Bridges are critical and valuable components in any road and rail transportation network. Therefore bridge remediation has always been a top priority for asset managers and engineers, but identifying the nature of true defect deterioration and associated remediation treatments remains a complex task. Nowadays Decision Support Systems (DSS) are widely used to assist decision makers across an extensive spectrum of unstructured decision environments. The main objective of this research is to develop a requirements-driven methodology for bridge monitoring and maintenance which has the ability to assess the bridge condition and find the best remediation treatments using Simple Multi Attribute Rating …
Advanced Directional Drilling Technology For Gas Drainage And Exploration In Australian Coal Mines, Fangtian Wang, Ting Ren, Frank Hungerford, Shihao Tu, Najdat I. Aziz
Advanced Directional Drilling Technology For Gas Drainage And Exploration In Australian Coal Mines, Fangtian Wang, Ting Ren, Frank Hungerford, Shihao Tu, Najdat I. Aziz
Faculty of Engineering - Papers (Archive)
With the continuing technology innovation, directional drilling technology has provided the coal mining industry with effective and practical options for pre- and post-drainage and exploration in Australia. In the past thirty years, in-mine borehole steering equipment has been developed from the single shot camera survey systems to the advanced Directional Drill Monitor utilizing Modular Electrically Connected Cable Assembly (DDM-MECCA) survey instruments, which provides rapid and easy underground borehole survey measurements whilst drilling. The presence of coal seam gas such as methane poses a significant safety hazard to underground coal mining all over the world. However, gas can be captured using …
Development Of A Water-Mist Based Venturi System For Dust Control From Maingate Chocks And Bsl, Ting Ren, Graeme Cooper, Srinivasa Yarlagadda
Development Of A Water-Mist Based Venturi System For Dust Control From Maingate Chocks And Bsl, Ting Ren, Graeme Cooper, Srinivasa Yarlagadda
Faculty of Engineering - Papers (Archive)
Advances in modern longwall (LW) technology have resulted in high production faces with more powerful chocks and shearers that can advance at faster rates. As longwall chocks (supports) advance, crushed roof coal and/or rock can fall from the top of the chock canopy into the face ventilation airflow. Dust survey showed that chock movement is a significant source of dust exposure for shearer operators, accounting for about 47% of total LW face dust make during the cutting cycle. 3D CFD models have been developed to understand the behaviour of longwall dust particles from various sources including maingate (MG) chocks and …
Practice And Prospect Of Fully Mechanised Mininig Technology For Thin Coal Seams Under Complex Conditions In China, Shihao Tu, Fangtian Wang, Yan Lu, Qi Wu, Qingsheng Bai
Practice And Prospect Of Fully Mechanised Mininig Technology For Thin Coal Seams Under Complex Conditions In China, Shihao Tu, Fangtian Wang, Yan Lu, Qi Wu, Qingsheng Bai
Faculty of Engineering - Papers (Archive)
In China, thin coal seam are rich in resources and complex in conditions, however, the characteristics such as narrow mining space, the low level of mechanised technology, bad working environment and the high cost of mining, directly restrict the development of mining safety and high-efficiency. In thin coal seams with hard gangue which contains concretions of pyrite, LS-DYNA is applied to calculate the rational blasting parameters and carry out the deep-hole pre-splitting blasting technology, the hard gangue is fractured effectively, hence advancing the productivity of thin coal seam mining. In addition, the mining rate is sped up in thin protective …
Simultaneous Activated Carbon Adsorption Within A Membrane Bioreactor For An Enhanced Micropollutant Removal, Xueqing Li, Faisal I. Hai, Long Nghiem
Simultaneous Activated Carbon Adsorption Within A Membrane Bioreactor For An Enhanced Micropollutant Removal, Xueqing Li, Faisal I. Hai, Long Nghiem
Faculty of Engineering - Papers (Archive)
Significant adsorption of sulfamethoxazole and carbamazepine to powdered activated carbon (PAC) was confirmed by a series of adsorption tests. In contrast, adsorption of these micropollutants to the sludge was negligible. The removal of these compounds in membrane bioreactor (MBR) was dependent on their hydrophobicity and loading as well as the PAC dosage. Sulfamethoxazole exhibited better removal rate during operation under no or low (0.1 g/L) PAC dosage. When the PAC concentration in MBR was raised to 1.0 g/L, a sustainable and significantly improved performance in the removal of both compounds was observed – the removal efficiencies of sulfamethoxazole and carbamazepine …
Vortex Dynamics For Low- Type-Ii Superconductors, X B Xu, H Fangohr, Z H Wang, M Gu, S.L. Liu, Dongqi Shi, S. X. Dou
Vortex Dynamics For Low- Type-Ii Superconductors, X B Xu, H Fangohr, Z H Wang, M Gu, S.L. Liu, Dongqi Shi, S. X. Dou
Faculty of Engineering - Papers (Archive)
Based on a model appropriate for “marginally type-II” superconducting system, we study the dynamics of vortices with competing interactions by Langevin dynamics simulation. In addition to pinned states and plastic flow, we find that the moving vortex system forms ordered bubble configurations and stripe structures, depending on pinning strength and driving force. The vortex system exhibits a marked hysteresis in its velocity-force characteristic, which results from a dynamical stripe reordering due to intervortex attraction.
Potential High Resolution Dosimeters For Mrt, E. Brauer-Krisch, Anatoly B. Rosenfeld, Michael L. Lerch, Marco Petasecca, M. Akselrod, J. Sykora, J. Bartz, M. Ptaszkiewicz, P. Olko, A. Berg, M. Wieland, S. Doran, T. Brochard, A. Kamlowski, G. Cellere, A. Paccagnella, Erik A. Siegbahn, Y. Prezado, I. Martinez-Rovira, A. Bravin, Laurent Dusseau, P. Berkvens
Potential High Resolution Dosimeters For Mrt, E. Brauer-Krisch, Anatoly B. Rosenfeld, Michael L. Lerch, Marco Petasecca, M. Akselrod, J. Sykora, J. Bartz, M. Ptaszkiewicz, P. Olko, A. Berg, M. Wieland, S. Doran, T. Brochard, A. Kamlowski, G. Cellere, A. Paccagnella, Erik A. Siegbahn, Y. Prezado, I. Martinez-Rovira, A. Bravin, Laurent Dusseau, P. Berkvens
Faculty of Engineering - Papers (Archive)
Microbeam Radiation Therapy (MRT) uses highly collimated, quasi-parallel arrays of X-ray microbeams of 50-600 keV, produced by 2nd and 3rd generation synchrotron sources, such as the National Synchrotron Light Source (NSLS) in the U.S., and the European Synchrotron Radiation Facility (ESRF) in France, respectively. High dose rates are necessary to deliver therapeutic doses in microscopic volumes, to avoid spreading of the microbeams by cardiosynchronous movement of the tissues. A small beam divergence and a filtered white beam spectrum in the energy range between 30 and 250 keV results in the advantage of steep dose gradients with a sharper penumbra than …
Evolutionary Modeling For Streamflow Forecasting With Minimal Datasets: A Case Study In The West Malian River, China, Qingwei Ni, Li Wang, Renzhen Ye, Fenglin Yang, Muttucumaru Sivakumar
Evolutionary Modeling For Streamflow Forecasting With Minimal Datasets: A Case Study In The West Malian River, China, Qingwei Ni, Li Wang, Renzhen Ye, Fenglin Yang, Muttucumaru Sivakumar
Faculty of Engineering - Papers (Archive)
A large data set is generally needed when modeling hydrological processes. However, for developing countries such as China, data sets are often unavailable in remote areas. An attempt to apply a novel genetic programming (GP) technique was made to model the relationship between streamflow of the West Malian River and the impact of climate change in the northeastern part of China. Available annual streamflow and climatic data were used for training and testing of the GP model. Data from the years between 1982 and 2002 were used for automatic selection of the model relationship. Prediction of the model was undertaken …
Wide Dynamic Range Acquisition System For Innovative Radiation Detectors, Marco Petasecca, B Alpat, G Ambrosi, M Menichelli, A Papi, P Cirrone, F Ferrera, P Figuera, P Finocchiaro, M Lattuada, D Rifuggiato, F Bizzarri, S Blasko, Diego Caraffini, Francesca Renzi, H Denizli
Wide Dynamic Range Acquisition System For Innovative Radiation Detectors, Marco Petasecca, B Alpat, G Ambrosi, M Menichelli, A Papi, P Cirrone, F Ferrera, P Figuera, P Finocchiaro, M Lattuada, D Rifuggiato, F Bizzarri, S Blasko, Diego Caraffini, Francesca Renzi, H Denizli
Faculty of Engineering - Papers (Archive)
There is particular interest to develop low-noise and wide dynamic range data acquisition systems for silicon detectors in view of using the same acquisition readout electronics for a wide range of application fields like monitoring and characterization of radiation sources or particle beams. In the framework of a research project for the qualification of Components Off The Shelf (COTS) for their use in space, research groups from INFN-Perugia, INFN-LNS and from MAPRAD have developed a fully automated, remote controllable, wide dynamic range acquisition system for silicon strip or pixelated detectors. Its design and a basic description of the performance are …
Nanocoating Of Particles For Optimal Doping And Universal Enhancement Of Current-Carrying Ability In "Organic" Mgb2-Xcx Superconductors, Olga V. Shcherbakova, Alexey V. Pan, S X. Dou, Rashmi Nigam, David Wexler
Nanocoating Of Particles For Optimal Doping And Universal Enhancement Of Current-Carrying Ability In "Organic" Mgb2-Xcx Superconductors, Olga V. Shcherbakova, Alexey V. Pan, S X. Dou, Rashmi Nigam, David Wexler
Faculty of Engineering - Papers (Archive)
The universal approach of liquid mixing has been found to produce “organic” MgB2−xCx superconductors with structural and supercurrent-carrying properties unattainable by other techniques. We show by transmission electron microscopy combined with energy dispersive spectroscopy that these unique properties are enabled through coating of boron particles with a nanolayer of carbon. The subsequent reaction between carbon-encapsulated boron and magnesium results in enhanced carbon content x in the crystal lattice, as determined by x-ray diffraction pattern analysis. Among various carbon-containing compounds investigated, polycarbosilane has been found to be the optimal dopant for MgB2 superconductor, producing the largest …
A Stiffness Enhancement Methodology For Artificial Muscles, Rahim Mutlu, Gursel Alici
A Stiffness Enhancement Methodology For Artificial Muscles, Rahim Mutlu, Gursel Alici
Faculty of Engineering - Papers (Archive)
Electroactive conducting polymer actuators have been proposed as alternative to conventional actuators due to their extraordinary properties. This paper reports on a stiffness enhancement methodology for cantilever type conducting polymer actuators based on a suitably designed contact surface with which the actuators are in contact during operation. Finite element analysis and modeling are used to quantify the effect of the contact surface on the effective stiffness of a tri-layer cantilevered beam, which represents one-end free, the other end fixed polypyrrole (PPy) conducting polymer actuator under a uniformly distributed load. After demonstrating the feasibility of the stiffness enhancement concept, experiments were …
Silicon/Single-Walled Carbon Nanotube Composite Paper As A Flexible Anode Material For Lithium Ion Batteries, Shulei Chou, Yue Zhao, Jiazhao Wang, Zhixin Chen, Hua-Kun Liu, S. X. Dou
Silicon/Single-Walled Carbon Nanotube Composite Paper As A Flexible Anode Material For Lithium Ion Batteries, Shulei Chou, Yue Zhao, Jiazhao Wang, Zhixin Chen, Hua-Kun Liu, S. X. Dou
Faculty of Engineering - Papers (Archive)
Flexible silicon/single-walled carbon nanotube (Si/SWCNT) composite paper was prepared using the pulsed laser deposition (PLD) method to deposit Si onto SWCNT paper. In the composite, Si mainly shows nanoworm-like morphology. Increasing deposition time results in an increased amount of Si microspheres. Electrochemical measurements show that the capacity of the composite paper is improved by the presence of Si. The Si/SWCNT composite with only 2.2% Si shows a capacity of 163 mA h g−1 at a current density of 25 mA g−1 up to 50 cycles, which is more than 60% improvement of the capacity of pristine CNT paper. …
Sno2-Nio-C Nanocomposite As A High Capacity Anode Material For Lithium-Ion Batteries, Mohd Faiz Hassan, Md Mokhlesur Rahman, Zaiping Guo, Zhixin Chen, Hua-Kun Liu
Sno2-Nio-C Nanocomposite As A High Capacity Anode Material For Lithium-Ion Batteries, Mohd Faiz Hassan, Md Mokhlesur Rahman, Zaiping Guo, Zhixin Chen, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
Carbon-coated SnO2–NiO nanocomposite was successfully synthesized via the molten salt route, using SnCl2·H2O and NiCl2·6H2O as the starting materials, with a molten salt composition of H2O2:LiOH·H2O:LiNO3 as a solvent at 300 °C. The synthesis was followed by a carbon layering process. The phases and morphology of the as-prepared samples were examined by X-ray diffraction and transmission electron microscopy. Electrochemical investigation was carried out by using a series of complementary techniques, including galvanostatic charge–discharge, cyclic voltammetry, and impedance spectroscopy. The results confirmed that the …
Controlled Synthesis Of Polyaniline Inside Mesoporous Carbon For Electroanalytical Sensors, Shenmin Zhu, Jiajun Gu, Junping Dong, Xinye Liu, Zhixin Chen, Chenxin Chen, Di Zhang
Controlled Synthesis Of Polyaniline Inside Mesoporous Carbon For Electroanalytical Sensors, Shenmin Zhu, Jiajun Gu, Junping Dong, Xinye Liu, Zhixin Chen, Chenxin Chen, Di Zhang
Faculty of Engineering - Papers (Archive)
A novel electroanalytical system was developed using polyaniline (PANI) functionalized ordered mesoporous carbon (CMK-3). Hydrophilic surface modification of CMK-3 is necessary and enables monomers to penetrate the pore channels of CMK-3, which makes it possible for the formation of PANI layers inside the pores of CMK-3 via in situ polymerization. The structures of the surface-modified ordered mesoporous carbon (m-CMK-3) and the PANI functionalized composites (CMK-PANIs) were characterized by X-ray diffraction, thermal gravimetric analysis, Fourier transform-infrared spectroscopy, transmission electron microscopy, and N2 adsorption measurements. The catalytic effect of the resultant CMK-PANI composite electrodes with various PANI loadings on the hydroquinone/quinine …
Direct Scattered Growth Of Mwnt On Si For High Performance Anode Material In Li-Ion Batteries, Pengfei Gao, Yanna Nuli, Yu-Shi He, Andrew I. Minett, Jiazhao Wang, Jun Yang, Jun Chen
Direct Scattered Growth Of Mwnt On Si For High Performance Anode Material In Li-Ion Batteries, Pengfei Gao, Yanna Nuli, Yu-Shi He, Andrew I. Minett, Jiazhao Wang, Jun Yang, Jun Chen
Faculty of Engineering - Papers (Archive)
A novel Si-MWNT nanocomposite synthesized via a CVD process shows a high reversible capacity of over 1500 mAh g−1 and stable cycling performance, which can be ascribed to the maintenance of a good conductive network by means of the direct scattered growth and pinning of MWNTs on Si particles.
Si-Based Anode Materials For Lithium Rechargeable Batteries, Hua-Kun Liu, Zaiping Guo, Jiazhao Wang, Konstantin K. Konstantinov
Si-Based Anode Materials For Lithium Rechargeable Batteries, Hua-Kun Liu, Zaiping Guo, Jiazhao Wang, Konstantin K. Konstantinov
Faculty of Engineering - Papers (Archive)
Silicon is a very promising candidate to replace graphite as the anode in Li-ion batteries because of its very high theoretical capacity, relatively low cost and low toxicity. However, it has not yet made its way into commercial cells. This review highlights recent progress on Si-based anode materials for lithium rechargeable batteries.
Simulation Of Low Dose Positron Emission Mammography Scanner For Global Breast Health Applications, W. J Ryder, I. N Wienberg, P. S Stepanov, A Reznik, M Urdaneta, E Anashkin, M. A Masoomi, Anatoly B. Rosenfeld
Simulation Of Low Dose Positron Emission Mammography Scanner For Global Breast Health Applications, W. J Ryder, I. N Wienberg, P. S Stepanov, A Reznik, M Urdaneta, E Anashkin, M. A Masoomi, Anatoly B. Rosenfeld
Faculty of Engineering - Papers (Archive)
Positron emission mammography ("PEM") is a breast imaging modality that typically involves the administration of relatively high doses of radiotracer. In order to reduce tracer costs and consider PEM for global screening applications, it would be helpful to reduce the required amount of administered radiotracer so that patient dose would be comparable to conventional x-ray mammograms. We performed GATE Monte Carlo investigations of several possible camera configurations. Increasing the detector thickness from 10 to 30 mm, increasing the camera surface area from 5 x 20cm2 to 20 x 20cm2, and applying depth-ofinteraction information to increase the acceptance angle, increased the …
Establishing A Project Based Learning Environment For First Year Engineering Students, Brad Stappenbelt
Establishing A Project Based Learning Environment For First Year Engineering Students, Brad Stappenbelt
Faculty of Engineering - Papers (Archive)
A project-based learning environment was recently established for first-year engineering students at the University of Western Australia. At the focus of this educational approach was a real international development project run within the core undergraduate unit Introduction to Professional Engineering. Students embarking on the professional development component of the engineering degree were traditionally taught about the role of the engineer, social and cultural engineering considerations, the multi-disciplinary nature of large engineering projects and team working and communication skills with minimal involvement in project and group work. The various concepts covered were treated primarily on an abstract theoretical level. Despite the …
Flame Spray-Pyrolyzed Vanadium Oxide Nanoparticles For Lithium Battery Cathodes, See How Ng, T J. Patey, R Buchel, F Krumeich, Jiazhao Wang, Hua-Kun Liu, S E. Pratsinis, P Novak
Flame Spray-Pyrolyzed Vanadium Oxide Nanoparticles For Lithium Battery Cathodes, See How Ng, T J. Patey, R Buchel, F Krumeich, Jiazhao Wang, Hua-Kun Liu, S E. Pratsinis, P Novak
Faculty of Engineering - Papers (Archive)
Vanadium pentoxide (V2O5) nanoparticles (30–60 nm) were made by a one-step and scalable flame spray pyrolysis (FSP) process. Optimization of the FSP processing conditions (precursor concentration and injection rate) enhanced the electrochemical performance of these nanoparticles. Increasing the cut-off potential for discharging from 1.5 to 2.5 V vs. Li/Li+ improved the cycle life of these V2O5 nanoparticles. Particles with the lowest specific surface area (32 m2 g−1) and highest phase purity (up to 98 wt%) showed excellent cyclability between 2.5 and 4.0 V vs. Li/Li+, retaining a …
A Variable Stiffness Mr Damper For Vibration Suppression, Xianzhou Zhang, Weihua Li, Yang Zhou
A Variable Stiffness Mr Damper For Vibration Suppression, Xianzhou Zhang, Weihua Li, Yang Zhou
Faculty of Engineering - Papers (Archive)
This paper presents the development of a magnetorheological (MR) fluid-based variable stiffness damper and analysis its applications in vibration suppression. The MR fluid isolator used a MR valve control unit and bladders to achieve the variable stiffness and damping in stepless and relative large scope. A mathematical model of the isolator was derived, a prototype of the MR fluid isolator was fabricated and its dynamic behavior was measured in vibration under various applied magnetic fields. The effective stiffness and damping coefficients of the isolator under various magnetic fields were identified and the dynamic performances of isolator were evaluated with simulation. …
An Age-Based Inspection And Replacement Policy For Heterogeneous Components, Philip A. Scarf, Cristiano A. V. Cavalcante, Richard A. Dwight, Peter Gordon
An Age-Based Inspection And Replacement Policy For Heterogeneous Components, Philip A. Scarf, Cristiano A. V. Cavalcante, Richard A. Dwight, Peter Gordon
Faculty of Engineering - Papers (Archive)
This paper considers a hybrid maintenance policy for a single component from a heterogeneous population. The component is placed in a socket, and the component and socket together comprise the system. The s-population of components consists of two sub-populations with different failure characteristics. By supposing that a component may be in a defective but operating state, so that there exists a delay time between defect arrival and component failure, we consider a novel maintenance policy that is a hybrid of inspection and replacement policies. There are similarities in this approach with the concept of ldquoburn-inrdquo maintenance. The policies are …
Increased Superconductivity For Cnt Doped Mgb2 Sintered In 5t Pulsed Magnetic Field, Wenxian Li, Ying Li, Rong Hua Chen, Rong Zeng, Lin Lu, Yun Zhang, Michael Tomsic, Matthew Rindfleisch, S. X. Dou
Increased Superconductivity For Cnt Doped Mgb2 Sintered In 5t Pulsed Magnetic Field, Wenxian Li, Ying Li, Rong Hua Chen, Rong Zeng, Lin Lu, Yun Zhang, Michael Tomsic, Matthew Rindfleisch, S. X. Dou
Faculty of Engineering - Papers (Archive)
The superconductivity of carbon nanotube (CNT) doped MgB2 sintered in pulsed magnetic field (PMF) was investigated with Raman scattering measurements and Raman spectral fit analysis. Although the carbon (C) substitution for the boron (B) is increased for the sample sintered in PMF, its superconductivity is advanced comparing with the sample sintered without PMF. The improved critical transition temperature, Tc, is attributed to the strengthening of the electron-phonon coupling (EPC) in MgB2, as reflected by the broadened E 2g mode in the Raman spectra, because the carbon atoms are homogeneously distributed in the boron planes.
Carbon Nanotube Network Modified Carbon Fibre Paper For Li Ion Batteries, Jun Chen, Jiazhao Wang, Andrew I. Minett, Yong Liu, Carol M. Lynam, Hua-Kun Liu, G G. Wallace
Carbon Nanotube Network Modified Carbon Fibre Paper For Li Ion Batteries, Jun Chen, Jiazhao Wang, Andrew I. Minett, Yong Liu, Carol M. Lynam, Hua-Kun Liu, G G. Wallace
Faculty of Engineering - Papers (Archive)
Here we report on the direct deposition of large quantities of highly porous carbon nanotube networks onto a carbon fibre paper support; subsequently utilised as the anode in a Li-ion battery application showing improved long-term performance and chemical stability with a significant fully reversible capacity of 546mAh/g.