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Electron Contamination Modeling And Skin Dose In 6 Mv Longitudinal Field Mrigrt: Impact Of The Mri And Mri Fringe Field, Bradley Oborn, Peter E. Metcalfe, Martin Butson, Anatoly B. Rosenfeld, P J. Keall
Electron Contamination Modeling And Skin Dose In 6 Mv Longitudinal Field Mrigrt: Impact Of The Mri And Mri Fringe Field, Bradley Oborn, Peter E. Metcalfe, Martin Butson, Anatoly B. Rosenfeld, P J. Keall
Faculty of Engineering - Papers (Archive)
PURPOSE: In recent times, longitudinal field MRI-linac systems have been proposed for 6 MV MRI-guided radiotherapy (MRIgRT). The magnetic field is parallel with the beam axis and so will alter the transport properties of any electron contamination particles. The purpose of this work is to provide a first investigation into the potential effects of the MR and fringe magnetic fields on the electron contamination as it is transported toward a phantom, in turn, providing an estimate of the expected patient skin dose changes in such a modality. METHODS: Geant4 Monte Carlo simulations of a water phantom exposed to a 6 …
Electrical And Thermoelectric Properties Of Single-Wall Carbon Nanotube Doped Bi2te3, Y Zhang, Xiaolin Wang, W K. Yeoh, R K. Zeng, C Zhang
Electrical And Thermoelectric Properties Of Single-Wall Carbon Nanotube Doped Bi2te3, Y Zhang, Xiaolin Wang, W K. Yeoh, R K. Zeng, C Zhang
Faculty of Engineering - Papers (Archive)
The effects of single-wall carbon nanotube (SWCNT) doping in n-type Bi2Te3 bulk samples on the electrical and thermal transport properties have been studied. Bi2Te3 samples doped with 0–5 wt. % SWCNTs were fabricated using solid state reaction and investigated using x-ray diffraction, transmission electron microscopy, and magneto transport measurements. Results show that the 0.5% doping results in the significant enhancement of the Seebeck coefficience to as high as -231.8 lV/K, giant magneto resistance of up to 110%, reduction of thermal conductivity, and change of sign of the Seebeck coefficient from n to p type depending on the doping level and …
A New Adaptive Fuzzy-Hybrid Control Strategy Of Semi-Active Suspension With Magneto-Rheological Damper, Pipit Wahyu Nugroho, H Du, W H. Li, G Alici
A New Adaptive Fuzzy-Hybrid Control Strategy Of Semi-Active Suspension With Magneto-Rheological Damper, Pipit Wahyu Nugroho, H Du, W H. Li, G Alici
Faculty of Engineering - Papers (Archive)
This paper presents the design and analysis of a new adaptive fuzzy (AF) logic and hybrid (skyhook plus groundhook) control technique applied to a semi-active suspension system of a quarter car mode. The hybrid control is applied because of its very good performance in ride comfort and road handling. Meanwhile, Fuzzy adaptive system is suitable for analysis of stability with non-linear performances. The adaptive fuzzy algorithm is used to approximate the estimated mass of the variable damping in the Hybrid loop. This model is adopting a Takagi-Sugeno configuration with a back propagation learning method typically used in a neural network …
Stress-Strain Model For Concrete Under Cyclic Loading, Farhad Aslani, Raha Jowkarmeimandi
Stress-Strain Model For Concrete Under Cyclic Loading, Farhad Aslani, Raha Jowkarmeimandi
Faculty of Engineering - Papers (Archive)
A hysteretic stress-strain model is developed for unconfined concrete with the intention of providing efficient modelling for the structural behaviour of concrete in seismic regions. The proposed model is based on the findings of previous experimental and analytical studies. The model for concrete subjected to monotonic and cyclic loading comprises four components in compression and tension - an envelope curve (for monotonic and cyclic loading), an unloading curve, a reloading curve and a transition curve. Formulations for partial unloading and partial reloading curves are also presented. The reliability of the proposed constitutive model is investigated for a reinforced concrete member …
Variations In Strength Of Lime-Treated Soft Clays, Martin D. Liu, Buddhima Indraratna, Suksun Horpibulsuk, Jirayut Suebsuk
Variations In Strength Of Lime-Treated Soft Clays, Martin D. Liu, Buddhima Indraratna, Suksun Horpibulsuk, Jirayut Suebsuk
Faculty of Engineering - Papers (Archive)
Strength is often the most significant parameter in measuring the effect of soil improvement in geotechnical engineering practice. In this paper, a primary study is made of the variation in unconfined compressive strength of lime-treated soft clays under various practical conditions. There are three major factors that affect the strength development: lime content, curing time, and curing temperature. The variations in strength with the three factors are analysed and quantified by proposed empirical equations. These equations are verified against experimental data independently. Based on an analysis of the above simulations, a general strength equation is proposed, unifying the influence of …
Seismic Performance Of Bridges Designed According To As 5100, M Neaz Sheikh, F Legeron, Hing-Ho Tsang
Seismic Performance Of Bridges Designed According To As 5100, M Neaz Sheikh, F Legeron, Hing-Ho Tsang
Faculty of Engineering - Papers (Archive)
Bridges are the critical components of a nation’s transportation system, as closure of an important bridge in the event of an earthquake can disrupt the total transportation network. In Australian standard for bridge design, ASBD (AS 5100-2004), consistent with other major bridge design codes (for example, AASHTO in the USA and CAN/CSA-S6 in Canada), bridges are classified according to their importance levels. The anticipated performances (performance objectives) of the bridges in small to moderate (Return Period, RP= 100 years), design level (RP= 500 years) and large (RP= 2500 years) earthquake events have been specified in major bridge design codes, although …
Strength And Compressibility Of Lightweight Cemented Clays, Suksun Horpibulsuk, Apichat Suddeepong, Avirut Chinkulkijniwat, Martin D. Liu
Strength And Compressibility Of Lightweight Cemented Clays, Suksun Horpibulsuk, Apichat Suddeepong, Avirut Chinkulkijniwat, Martin D. Liu
Faculty of Engineering - Papers (Archive)
Lightweight cemented clays have wide applications in infrastructure rehabilitation and in construction of new facilities. The strength and compression characteristics of lightweight cemented clays with non- to high swelling potential are investigated and presented in this article. The workable state, the optimum water content to produce the lightweight cemented clay, is about 1.9 times the liquid limit. The void/cement ratio, V/C, which is defined as the ratio of the void volume of clay to the cement volume, is proved to be the prime parameter governing the strength and compression characteristics of lightweight cemented clays. The fabric (arrangement of clay particles, …
Application Of Vacuum Consolidation For Sustainable Transport Infrastructure, Cholachat Rujikiatkamjorn, Buddhima Indraratna
Application Of Vacuum Consolidation For Sustainable Transport Infrastructure, Cholachat Rujikiatkamjorn, Buddhima Indraratna
Faculty of Engineering - Papers (Archive)
A system of vertical drains combined with vacuum preloading to accelerate soil consolidation by promoting radial flow is an effective method. In this paper, the analytical modelling of vertical drains incorporating vacuum preloading in an axisymmetric condition is proposed. The distribution of vacuum pressure along the drain and variations in volume compressibility, and permeability of soil based on large scale laboratory observations are included in the proposed solutions. These analytical predictions are compared with a case history taken from Thailand where the entire embankment was stabilised with vertical drains and subjected to vacuum preloading. This analysis employing the writer’s model …
Infrared Phonon Anomaly And Magnetic Excitations In Single-Crystal Cu3bi(Seo3)2o2cl, K H. Miller, P W. Stephens, C Martin, E Constable, R A. Lewis, H Berger, G L. Carr, D B. Tanner
Infrared Phonon Anomaly And Magnetic Excitations In Single-Crystal Cu3bi(Seo3)2o2cl, K H. Miller, P W. Stephens, C Martin, E Constable, R A. Lewis, H Berger, G L. Carr, D B. Tanner
Faculty of Engineering - Papers (Archive)
nfrared reflection and transmission as a function of temperature have been measured on single crystals of Cu3Bi(SeO3)2O2Cl. The complex dielectric function and optical properties along all three principal axes of the orthorhombic cell were obtained via Kramers-Kronig analysis and by fits to a Drude-Lorentz model. Below 115 K, 16 additional modes [8(E∥â)+6(E∥b̂)+2(E∥ĉ)] appear in the phonon spectra; however, powder x-ray diffraction measurements do not detect a new structure at 85 K. Potential explanations for the new phonon modes are discussed. Transmission in the far infrared as a function of temperature has revealed …
Characterization Of A Novel Diamond-Based Microdosimeter Prototype For Radioprotection Applications In Space Environments, Jeremy A. Davis, Kumaravelu Ganesan, Andrew D. C Alves, Susanna Guatelli, Marco Petasecca, Jayde Livingstone, Michael L. F Lerch, Dale A. Prokopovich, Mark I. Reinhard, Rainer M. Siegele, Steven Prawer, David Jamieson, Zdenka Kuncic, Vincent L. Pisacane, John F. Dicello, James Ziegler, Marco Zaider, Anatoly B. Rosenfeld
Characterization Of A Novel Diamond-Based Microdosimeter Prototype For Radioprotection Applications In Space Environments, Jeremy A. Davis, Kumaravelu Ganesan, Andrew D. C Alves, Susanna Guatelli, Marco Petasecca, Jayde Livingstone, Michael L. F Lerch, Dale A. Prokopovich, Mark I. Reinhard, Rainer M. Siegele, Steven Prawer, David Jamieson, Zdenka Kuncic, Vincent L. Pisacane, John F. Dicello, James Ziegler, Marco Zaider, Anatoly B. Rosenfeld
Faculty of Engineering - Papers (Archive)
This paper is dedicated to the characterization of a novel diamond microdosimeter prototype with 3D sensitive volumes produced by high energy boron implantation. Diamond has been chosen in order to further improve solid state based microdosimeter in terms of radiation hardness and tissue equivalency. IBIC measurements were undertaken to determine the charge collection efficiency map of the device. It was demonstrated that the proposed ion implantation technology allows for the formation of an array of well defined 3D SVs. A Geant4 application was developed to explain the effect of Al electrode thickness on observed anomaly in deposited energy. Specifics of …
Probing Exchange Bias Effects In Coo/Co Bilayers With Pillar-Like Coo Structures, David Laurence Cortie, Chin Shueh, Pei-Shi Chen, Jian-Fa Gao, Frank Klose, Jan Van Lierop, Ko-Wei Lin
Probing Exchange Bias Effects In Coo/Co Bilayers With Pillar-Like Coo Structures, David Laurence Cortie, Chin Shueh, Pei-Shi Chen, Jian-Fa Gao, Frank Klose, Jan Van Lierop, Ko-Wei Lin
Faculty of Engineering - Papers (Archive)
Exchange bias effects in CoO/Co bilayers fabricated by ion-assisted deposition were studied as a function of CoO thickness. During the deposition of the top CoO layer, pillar-like CoO structures were embedded in the underlying Co layer due to implantation of oxygen ions. The enhanced coercivity was attributed to the changes in the magnetic reversal mechanism in the ferromagnetic Co layer due to the penetration of pillar-like structures of antiferromagnetic CoO. At low temperature, we found a strong exchange bias field. Our measurements indicate that the exchange bias effect can exist in a nanocomposite system that has a disordered mixture of …
Large Area Silicon Microdosimeter For Dosimetry In High Let Space Radiation Fields: Charge Collection Study, Jayde Livingstone, Dale A. Prokopovich, Michael L. F Lerch, Marco Petasecca, Mark I. Reinhard, Hiroshi Yasuda, Marco Zaider, James F. Ziegler, Vincent L. Pisacane, John F. Dicello, Vladimir L. Perevertaylo, Anatoly B. Rosenfeld
Large Area Silicon Microdosimeter For Dosimetry In High Let Space Radiation Fields: Charge Collection Study, Jayde Livingstone, Dale A. Prokopovich, Michael L. F Lerch, Marco Petasecca, Mark I. Reinhard, Hiroshi Yasuda, Marco Zaider, James F. Ziegler, Vincent L. Pisacane, John F. Dicello, Vladimir L. Perevertaylo, Anatoly B. Rosenfeld
Faculty of Engineering - Papers (Archive)
Silicon microdosimeters for the characterisation of mixed radiation fields relevant to the space radiation environment have been under continual development at the Centre for Medical Radiation Physics for over a decade. These devices are useful for the prediction of single event upsets in microelectronics and for radiation protection of spacecraft crew. The latest development in silicon microdosimetry is a family of large-area n-SOI microdosimeters for real-time dosimetry in space radiation environments. The response of n-SOI microdosimeters to 2 MeV H and 5.5 MeV He ions has been studied to investigate their charge collection characteristics. The studies have confirmed 100% yield …
Modelling Of Temperature-Dependent Growth Kinetics Of Oxide Scale On Hot-Rolled Steel Strip, Xianglong Yu, Zhengyi Jiang, Dongbin Wei, Xiaodong Wang, Quan Yang
Modelling Of Temperature-Dependent Growth Kinetics Of Oxide Scale On Hot-Rolled Steel Strip, Xianglong Yu, Zhengyi Jiang, Dongbin Wei, Xiaodong Wang, Quan Yang
Faculty of Engineering - Papers (Archive)
A numerical simulation, developed to predict the temperature distribution and calculate the growth rale of the oxide scale formed on the microalloyed low carbon steel during the laminar cooling of hot strip rolling, was conducted by two-dimensional finite element method. The model takes into account the different thetmoPhYsical properties of the multilayered oxide scales and the film boundary conditions for the water jet impingement zone and the stable film boiling zone through the run-out table. Complied with the parabolic growth of the oxide layers and the distribution of the oxide phase, it is found that the present of wustite (FeO) …
Kinematic Analysis Of Electroactive Polymer Actuators As Soft And Smart Structures With More Dof Than Inputs, Rahim Mutlu, Gursel Alici, Weihua Li
Kinematic Analysis Of Electroactive Polymer Actuators As Soft And Smart Structures With More Dof Than Inputs, Rahim Mutlu, Gursel Alici, Weihua Li
Faculty of Engineering - Papers (Archive)
Electroactive polymer (EAP) actuators have been attracting the attention of researchers due to their muscle-like behaviour and unusual properties. Several modelling methods have been proposed to understand their mechanical, chemical, electrical behaviours or ‘electro-chemo-mechanical’ behaviour. However, estimating the whole shape or configuration of the EAP actuators has always been challenging due to their highly non-linear bending behaviour. This paper reports on an effective method to estimate the whole shape deflection of the EAP actuators by employing a so-called backbone approach. Tri-layer configured polypyrrole (PPy) based EAP actuators were used as a soft and smart structure with more degrees of freedom …
Magnetic Propulsion Of A Spiral-Type Endoscopic Microrobot In A Real Small Intestine, Hao Zhou, Gursel Alici, Trung Duc Than, Weihua Li, Sylvain Martel
Magnetic Propulsion Of A Spiral-Type Endoscopic Microrobot In A Real Small Intestine, Hao Zhou, Gursel Alici, Trung Duc Than, Weihua Li, Sylvain Martel
Faculty of Engineering - Papers (Archive)
This paper reports on the magnetic propulsion of a spiral-type endoscopic mircorobot in a real small intestine. Magnetic modeling was carried out to design and commission an external electromagnetic system, which wirelessly provides power to the robotic agent. The capsules with different spiral structures were magnetically propelled inside a segment of porcine small intestine. From the results, it is shown that the propulsive velocities of the tested capsules are in the range of 2.5 ~ 35 mm/s when rotating frequencies varying between 1 ~ 5 Hz are applied. Among all the capsules prepared for this study, the capsule No. 5, …
Giant And Anisotropic Magnetoresistances In P-Type Bi-Doped Sb 2te 3 Bulk Single Crystals, Z J. Yue, Xiaolin Wang, Y Du, S M. Mahboobeh, Frank F. Yun, Z X. Cheng, S. X. Dou
Giant And Anisotropic Magnetoresistances In P-Type Bi-Doped Sb 2te 3 Bulk Single Crystals, Z J. Yue, Xiaolin Wang, Y Du, S M. Mahboobeh, Frank F. Yun, Z X. Cheng, S. X. Dou
Faculty of Engineering - Papers (Archive)
Antimony telluride (Sb2Te3) compounds are well known as excellent thermoelectric materials and have been recently confirmed as three-dimensional topological insulators. In this letter, we have investigated the anisotropic magneto-transport properties of p-type Bi-doped Sb2Te3 bulk single crystals over a broad range of temperatures, degrees and magnetic fields. Giant magnetoresistance (MR) of up to 230% was observed, which exhibits quadratic field dependences in low fields and becomes linear at high fields without any trend towards saturation. The giant MR also shows strong anisotropy with anisotropy ratio up to 210% in angle-dependent measurements. The …
Microstructure Development And Alloying Elements Diffusion During Sintering Of Near-Beta Titanium Alloys, Elena Pereloma, Dmytro Savvakin, Andrew Carman, Azdiar Gazder, Orest Ivasishin
Microstructure Development And Alloying Elements Diffusion During Sintering Of Near-Beta Titanium Alloys, Elena Pereloma, Dmytro Savvakin, Andrew Carman, Azdiar Gazder, Orest Ivasishin
Faculty of Engineering - Papers (Archive)
Two near-beta alloys, Ti-5Al-5Mo-5V-2Cr-1Fe and Ti-10V-3Fe-3Al, were produced by the blended element powder metallurgy technique. The use of (i) elemental powders with the Al-V master alloy in the case of Ti-5Al-5Mo-5V-2Cr-1 Fe and, (ii) the complex Al-Fe-V master alloy in Ti-10V-3Fe-3Al has highlighted the influence of different alloying elements and their combination on microstructure evolution and chemical homogenisation. While Fe has the fastest diffusivity in Ti and its addition improves the density of both sintered alloys it also results in accelerated rates of grain coarsening. The combination of Al and V in the master alloy powder inhibits the diffusion of …
Strength Development In Blended Cement Admixed Saline Clay, Suksun Horpibulsuk, Worawit Phojan, Apichat Suddeepong, Avirut Chinkulkijniwat, Martin D. Liu
Strength Development In Blended Cement Admixed Saline Clay, Suksun Horpibulsuk, Worawit Phojan, Apichat Suddeepong, Avirut Chinkulkijniwat, Martin D. Liu
Faculty of Engineering - Papers (Archive)
Cement stabilization is extensively used to improve engineering properties of soft saline clays. The effect of salinity, which is modified by geological and climate changes, on the strength development in cement admixed saline clay is investigated in this paper. For a particular curing time and salt content, the strength development in saline clay admixed with cement is governed by the clay-water/cement ratio, wc/C. The strength increases with the decrease of wc/C. The increase in salt content for a particular water content decreases the inter-particle attraction of the clay and the cementation bond strength. Hence, for the same clay-water/cement ratio, the …
Numerical Simulation Of Fully Grouted Rock Bolts, Hossein Jalalifar, Naj Aziz
Numerical Simulation Of Fully Grouted Rock Bolts, Hossein Jalalifar, Naj Aziz
Faculty of Engineering - Papers (Archive)
This chapter describes the application of numerical modelling to civil and mining projects, particularly rock bolting, developing a Final Element (FE) model for the bolt, grout, rock, and two interfaces under axial and lateral loading, verifying the model, analysing the stress and strains developed in the bolt and surrounding materials. Numerical methods are the most versatile computational methods for various engineering disciplines because a structure is discritised into small elements and the constitutive equations that describe the individual elements and their interactions are constructed. Finally, these numerous equations are solved together simultaneously using computers. The results from this procedure include …
Future Of Australian Rail Tracks Capturing Higher Speeds With Heavier Freight, Buddhima Indraratna, Sanjay Nimbalkar, Cholachat Rujikiatkamjorn
Future Of Australian Rail Tracks Capturing Higher Speeds With Heavier Freight, Buddhima Indraratna, Sanjay Nimbalkar, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
In Australia, quicker and more cost effective commuter and freight transports are essential to cater for the needs of travel demand and supply chains in the mining and agriculture sectors. Such development in coastal areas would necessitate the use of ground improvement techniques in response to environmental legislation and requirements for improved performance and sustainability. In coastal Australia the high cost of track maintenance is the main issue due to poor drainage of soft coastal soils, ballast degradation, fouling (e.g. coal and subgrade soil), differential settlement of track, pumping of subgrade soils and track misalignment due to excessive lateral movements. …
Physical Modelling Of Soft Clay Consolidation Using Vacuum-Surcharge Method, Cholachat Rujikiatkamjorn
Physical Modelling Of Soft Clay Consolidation Using Vacuum-Surcharge Method, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
In Ihis paper, the large-scalc consolidation apparatus was employed to investi gate the performance of vacuum prelollding with conventional surcharge loading. Several tests were conducted \0 examine the efTect of a vacuum and associ(lled paTHlllclers Slich as smC:!T zone and soil permeability characteristics. The measured settlement and excess pore pressure indi cates that the vacuum application has certain benefits to control excess pore pressure for a given total loading applictlti on. The analyticn l modelling for rad ial consolidation and vacuum prcloading considering both variation of soil comprcssibility and perrneability was cmployed to predict the soil consolidation behaviour. It is …
Impact Of Mechanical Bending On The Electrochemical Performance Of Bendable Lithium Batteries With Paper-Like Free-Standing V2o5-Polypyrrole Cathodes, Lukman Noerochim, Jia-Zhao Wang, David Wexler, Md Mokhlesur Rahman, Jun Chen, Hua-Kun Liu
Impact Of Mechanical Bending On The Electrochemical Performance Of Bendable Lithium Batteries With Paper-Like Free-Standing V2o5-Polypyrrole Cathodes, Lukman Noerochim, Jia-Zhao Wang, David Wexler, Md Mokhlesur Rahman, Jun Chen, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
Highly flexible, paper-like, free-standing V2O5 and V2O5–polypyrrole (PPy) films were prepared via the vacuum filtration method. The films are soft, lightweight, and mechanically robust. The electrochemical performance of the free-standing pure V2O5 electrode was improved by incorporating conducting polypyrrole. A bendable cell with a novel design was fabricated, consisting of a free-standing V2O5–PPy cathode film, gel electrolyte, and a lithium foil anode. The cell was tested under repeated bending conditions for several cycles. The results show that the battery performance of the repeatedly bent cell was …
Graphene Wrapped Lifepo4/C Composites As Cathode Materials For Li-Ion Batteries With Enhanced Rate Capability, Yi Shi, Shulei Chou, Jia-Zhao Wang, David Wexler, Hui-Jun Li, Hua-Kun Liu, Yuping Wu
Graphene Wrapped Lifepo4/C Composites As Cathode Materials For Li-Ion Batteries With Enhanced Rate Capability, Yi Shi, Shulei Chou, Jia-Zhao Wang, David Wexler, Hui-Jun Li, Hua-Kun Liu, Yuping Wu
Faculty of Engineering - Papers (Archive)
To reduce the reaction time, electrical energy consumption, and cost, LiFePO4/C/graphene has been synthesized by a rapid, one-pot, microwave-assisted hydrothermal method within 15 min at a temperature of 200 °C, followed by sintering at 600 °C for 2 h under a H2/Ar (5:95, v/v) atmosphere. The microstructure and morphology of the LiFePO4/C/graphene products were characterized by means of X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy. The carbon coated LiFePO4/C nanoparticles, around 200 nm in size, are thoroughly wrapped by crumpled micrometer-size graphene sheets. In this kind …
Hot Deformation Of Cast And Extruded Tial: An In-Situ Diffraction Study, Thomas Schmoelzer, Klaus-Dieter Liss, Svea Mayer, Kun Yan, Mark H. Reid, Rian J. Dippenaar, Matthew Peel, Helmut Clemens
Hot Deformation Of Cast And Extruded Tial: An In-Situ Diffraction Study, Thomas Schmoelzer, Klaus-Dieter Liss, Svea Mayer, Kun Yan, Mark H. Reid, Rian J. Dippenaar, Matthew Peel, Helmut Clemens
Faculty of Engineering - Papers (Archive)
Intermetallic TiAl alloys are a class of innovative high-temperature materials which are developed to replace the substantially denser Ni-base alloys in low-pressure turbine blades of jet engines. By streamlining the production process of these parts, a substantial decrease in production costs can be achieved. To this end, a profound knowledge of the microstructural processes occurring during hot deformation is a prerequisite. To investigate the microstructural development during forming operations, cast and extruded as well as only cast specimens were hot-deformed and the microstructural development investigated in-situ by means of a novel diffraction method. This powder diffraction method utilizes the behavior …
Microstructural Characterisation Of Railhead Damage In Insulated Rail Joints, C Rathod, David Wexler, Tara Chandra, Huijun Li
Microstructural Characterisation Of Railhead Damage In Insulated Rail Joints, C Rathod, David Wexler, Tara Chandra, Huijun Li
Faculty of Engineering - Papers (Archive)
As an integral part the railway network infrastructure, insulated rail joints (IRJs) electrically isolate track segments providing critical feedback to both track signaling and train position detection systems. Because of the discontinuous nature of IRJs, accumulated damage at the railhead is high. Failure modes include plastic flow of metal across joints, bolt and fishplate failures, delamination of insulated material and, as a result of rolling contact fatigue, end post and endpost surface damage. In the current investigation, microstructural changes in the vicinity of endposts of IRJs made from both surface coated and uncoated rail are investigated using techniques of optical …
High Strength Thin-Walled Rectangular Concrete-Filled Tubular Slender Beam-Columns, Part Ii: Behaviour, Muhammad N. S Hadi, Qing Quan Liang, Vipulkumar I. Patel
High Strength Thin-Walled Rectangular Concrete-Filled Tubular Slender Beam-Columns, Part Ii: Behaviour, Muhammad N. S Hadi, Qing Quan Liang, Vipulkumar I. Patel
Faculty of Engineering - Papers (Archive)
Experimental and numerical research on full-scale high strength thin-walled rectangular steel slender tubes filled with high strength concrete has not been reported in the literature. In a companion paper, a new numerical model was presented that simulates the nonlinear inelastic behavior of uniaxially loaded high strength thin-walled rectangular concrete-filled steel tubular (CFST) slender beam-columns with local buckling effects. The progressive local and post-local buckling of thin steel tube walls under stress gradients was incorporated in the numerical model. This paper presents the verification of the numerical model developed and its applications to the investigation into the fundamental behavior of high …
Carbothermal Reduction And Nitridation Of Ilmenite Concentrates, Sheikh Abdul Rezan, Guangqing Zhang, Oleg Ostrovski
Carbothermal Reduction And Nitridation Of Ilmenite Concentrates, Sheikh Abdul Rezan, Guangqing Zhang, Oleg Ostrovski
Faculty of Engineering - Papers (Archive)
Carbothermal reduction and nitridation of ilmenite concentrates of different grades and synthetic rutile were studied in isothermal experiments in hydrogen – nitrogen gas atmosphere and pure nitrogen in a tube reactor. Concentrations of CO and CO2 in the off gas were measured online using infrared gas analyser. The reaction products were analysed by X-ray diffraction. Iron oxides in ilmenite concentrates were reduced to metallic iron, and titanium oxides were converted to titanium oxycarbonitride. Reduction of ilmenite concentrates and synthetic rutile in hydrogen containing gas was significantly faster than in pure nitrogen. The rate of conversion of titania to titanium oxycarbonitride …
Removal Of Trace Organic Contaminants By A Membrane Bioreactor-Granular Activated Carbon (Mbr -Gac) System, Luong N. Nguyen, Faisal I. Hai, Jinguo Kang, William E. Price, Long Nghiem
Removal Of Trace Organic Contaminants By A Membrane Bioreactor-Granular Activated Carbon (Mbr -Gac) System, Luong N. Nguyen, Faisal I. Hai, Jinguo Kang, William E. Price, Long Nghiem
Faculty of Engineering - Papers (Archive)
The removal of trace organics by a membrane bioreactor–granular activated carbon (MBR–GAC) integrated system were investigated. The results confirmed that MBR treatment can be effective for the removal of hydrophobic (logD > 3.2) and readily biodegradable trace organics. The data also highlighted the limitation of MBR in removing hydrophilic and persistent compounds (e.g. carbamazepine, diclofenac, and fenoprop) and that GAC could complement MBR very well as a post-treatment process. The MBR– GAC system showed high removal of all selected trace organics including those that are hydrophilic and persistent to biological degradation at up to 406 bed volumes (BV). However, over an …
Permeable Reactive Barrier (Prb) Technology For The Remediation Of Acidic Groundwater From Acid Sulphate Soil Floodplain In South East New South Wales, L J. Banasiak, B Indraratna, A. Golab
Permeable Reactive Barrier (Prb) Technology For The Remediation Of Acidic Groundwater From Acid Sulphate Soil Floodplain In South East New South Wales, L J. Banasiak, B Indraratna, A. Golab
Faculty of Engineering - Papers (Archive)
The release of acidic water contaminated with toxic metals such as aluminium (Al) and iron (Fe) resulting from pyrite oxidation within acid sulphate soils (ASSs) is a major environmental issue in Australia. Groundwater manipulation using weirs and modified floodgates is not effective in low-lying floodplains due to the high risk of flooding and their inability to prevent pyrite oxidation. Permeable reactive barrier (PRB) technology has been looked at as an alternative remediation technique in ASS terrain. Batch and short-term column tests were used to choose a suitable reactive material for the remediation of acidic water and the removal of Al …
Performance Of Cfrp Wrapped Square Reinforced Concrete Columns Subjected To Eccentric Loading, Ida Bagus Rai Widiarsa, Muhammad N. S Hadi
Performance Of Cfrp Wrapped Square Reinforced Concrete Columns Subjected To Eccentric Loading, Ida Bagus Rai Widiarsa, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
Strengthening concrete columns with fibre-reinforced polymer (FRP) has been tudied extensively, but the majority of published tudies have focllsed on circular column. Most concrete columns in the field have square 01' r ctangul3r cross ections and resist ecc nt.ric loading as well. The objective of this study i to investigate the performance of square reinforced concrete (RC) columns wrapped with carbon FRP subjected to eccentric Loading. The influence of two parameters was studied including the number of FRP layers and the magnitude of eccentricity. Compression testing was conducted on twe Ive short quare RC columns wrapped with CFRP composites. The …