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Articles 601 - 630 of 2936
Full-Text Articles in Social and Behavioral Sciences
Field Investigation On Compaction And Strength Performance Of Two Coal Wash-Bos Slag Mixtures, S.M.Ali Tasalloti, Buddhima Indraratna, Gabriele Chiaro, Ana Heitor
Field Investigation On Compaction And Strength Performance Of Two Coal Wash-Bos Slag Mixtures, S.M.Ali Tasalloti, Buddhima Indraratna, Gabriele Chiaro, Ana Heitor
Faculty of Engineering and Information Sciences - Papers: Part A
The effective reuse and recycling of industrial byproducts, namely coal wash (CW) and basic oxygen steel slag (BOS), through large-scale geotechnical projects (e.g. land and port reclamation) is economically beneficial and environmentally sustainable. Nevertheless, due to the heterogeneity of these granular waste materials, the actual performance of compacted fill in the field can be significantly different from that observed in the laboratory. This paper reports the results of a compaction field trial carried out at Port Kembla Outer Harbor reclamation site (Wollongong, Australia) to evaluate the in situ performance of two selected CW-BOS blends. Based on a number of field …
Efficient File Sharing In Electronic Health Records, Clementine Gritti, Willy Susilo, Thomas Plantard
Efficient File Sharing In Electronic Health Records, Clementine Gritti, Willy Susilo, Thomas Plantard
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Using Online And Multimedia Resources To Enhance The Student Learning Experience In A Telecommunications Laboratory Within An Australian University, Peter J. Vial, Sasha Nikolic, Montserrat Ros, David Stirling, Parviz Doulai
Using Online And Multimedia Resources To Enhance The Student Learning Experience In A Telecommunications Laboratory Within An Australian University, Peter J. Vial, Sasha Nikolic, Montserrat Ros, David Stirling, Parviz Doulai
Faculty of Engineering and Information Sciences - Papers: Part A
A laboratory component of an undergraduate telecommunications course consistently scored poorly for student learning experience on student surveys at an Australian university. Consultation with experienced academic staff revealed the need to modify the teaching resources available for the laboratory to include web-based multimedia and interactive resources. This new material was developed and made available to students and teaching staff in early 2011 via an Australian university e-learning package which was used to deliver the subject. The students and demonstrators were then encouraged to use this new resource to prepare for the three hour laboratory sessions. Surveys of students who took …
Deformation Behaviour Of Coal-Fouled Ballast Reinforced With Geogrid, N.T. Ngo, C Rujikiatkamjorn, B Indraratna
Deformation Behaviour Of Coal-Fouled Ballast Reinforced With Geogrid, N.T. Ngo, C Rujikiatkamjorn, B Indraratna
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents the results of an experimental study of coal-fouled ballast reinforced with geogrid, at various degrees of fouling and subjected to cyclic loading. A novel Track Process Simulation Testing Apparatus was used to realistically simulate fouled rail track conditions. The laboratory results demonstrated that coal fines acted as a lubricant, causing ballast aggregates to displace and rotate, and as a result, increase the deformation of ballast. However, coal fines also reduced ballast breakage somewhat because they fill the voids between the ballast particles and coat surface of ballast aggregates which reduce the inter-particle attrition. The placement of a …
Brittle Versus Ductile Behaviour Of Nanotwinned Copper: A Molecular Dynamics Study, Linqing Pei, Cheng Lu, Xing Zhao, Liang Zhang, Kuiyu Cheng, Guillaume Michal, A Kiet Tieu
Brittle Versus Ductile Behaviour Of Nanotwinned Copper: A Molecular Dynamics Study, Linqing Pei, Cheng Lu, Xing Zhao, Liang Zhang, Kuiyu Cheng, Guillaume Michal, A Kiet Tieu
Faculty of Engineering and Information Sciences - Papers: Part A
Nanotwinned copper (Cu) exhibits an unusual combination of ultra-high yield strength and high ductility. A brittle-to-ductile transition was previously experimentally observed in nanotwinned Cu despite Cu being an intrinsically ductile metal. However, the atomic mechanisms responsible for brittle fracture and ductile fracture in nanotwinned Cu are still not clear. In this study, molecular dynamics (MD) simulations at different temperatures have been performed to investigate the fracture behaviour of a nanotwinned Cu specimen with a single-edge-notched crack whose surface coincides with a twin boundary. Three temperature ranges are identified, indicative of distinct fracture regimes, under tensile straining perpendicular to the twin …
Piezoelectric Poly(Vinylidene Fluoride) Microstructure And Poling State In Active Tissue Engineering, Clarisse Ribeiro, Daniela M. Correia, S Ribeiro, Vitor Sencadas, Gabriela Botelho, Senentxu Lanceros-Méndez
Piezoelectric Poly(Vinylidene Fluoride) Microstructure And Poling State In Active Tissue Engineering, Clarisse Ribeiro, Daniela M. Correia, S Ribeiro, Vitor Sencadas, Gabriela Botelho, Senentxu Lanceros-Méndez
Faculty of Engineering and Information Sciences - Papers: Part A
Tissue engineering strategies rely on suitable membranes and scaffolds, providing the necessary physicochemical stimuli to specific cells. This review summarizes the main results on piezoelectric polymers, in particular poly(vinylidene fluoride), for muscle and bone cell culture. Further, the relevance of polymer microstructure and surface charge on cell response is demonstrated. Together with the necessary biochemical cues, the proper design of piezoelectric polymers can open the way to novel and more reliable tissue engineering strategies for cells in which electromechanical stimuli are present in their environment.
The Effects Of Vacuum Annealing Temperatures On The Microstructure, Mechanical Properties And Electrical Resistivity Of Mg-3al-1zn Alloy Ribbons, Fenghua Chen, Qingxue Huang, Zhengyi Jiang, Jingwei Zhao, Binyu Sun, Yugui Li
The Effects Of Vacuum Annealing Temperatures On The Microstructure, Mechanical Properties And Electrical Resistivity Of Mg-3al-1zn Alloy Ribbons, Fenghua Chen, Qingxue Huang, Zhengyi Jiang, Jingwei Zhao, Binyu Sun, Yugui Li
Faculty of Engineering and Information Sciences - Papers: Part A
This paper investigates the influence of vacuum annealing temperature on the microstructure, mechanical properties and electrical resistivity of Mg-3Al-1Zn rapid solidification (RS) magnesium ribbons. The results indicate that when the annealing temperature is increased, the grain size of the ribbons is dramatically reduced from 10 to 1 μm. The highest break stress and micro-hardness is obtained at 673 K. These effects are ascribed to the dispersion strengthening caused by the high amount of fine nanoparticles distributed in the material. Electrical resistivity-temperature (ρ-T) curves have been used to provide useful information about the effects of the annealing temperature on the grain …
A New Insight Into Ductile Fracture Of Ultrafine-Grained Al-Mg Alloys, Hailiang Yu, A Kiet Tieu, Cheng Lu, Xiong Liu, Mao Liu, Ajit R. Godbole, Charlie Kong, Q Qin
A New Insight Into Ductile Fracture Of Ultrafine-Grained Al-Mg Alloys, Hailiang Yu, A Kiet Tieu, Cheng Lu, Xiong Liu, Mao Liu, Ajit R. Godbole, Charlie Kong, Q Qin
Faculty of Engineering and Information Sciences - Papers: Part A
It is well known that when coarse-grained metals undergo severe plastic deformation to be transformed into nano-grained metals, their ductility is reduced. However, there are no ductile fracture criteria developed based on grain refinement. In this paper, we propose a new relationship between ductile fracture and grain refinement during deformation, considering factors besides void nucleation and growth. Ultrafine-grained Al-Mg alloy sheets were fabricated using different rolling techniques at room and cryogenic temperatures. It is proposed for the first time that features of the microstructure near the fracture surface can be used to explain the ductile fracture post necking directly. We …
Observed And Predicted Behaviour Of Rail Ballast Under Monotonic Loading Capturing Particle Breakage, Buddhima Indraratna, Qi Deng Sun, Sanjay Nimbalkar
Observed And Predicted Behaviour Of Rail Ballast Under Monotonic Loading Capturing Particle Breakage, Buddhima Indraratna, Qi Deng Sun, Sanjay Nimbalkar
Faculty of Engineering and Information Sciences - Papers: Part A
A substantial amount of experimental evidence suggests that the critical state envelope for ballast is nonlinear, especially at low confining pressure. To study the implications of this nonlinearity and the associated role of particle breakage, monotonically loaded drained triaxial tests were conducted using a large-scale cylindrical triaxial apparatus. A nonlinear critical state envelope is determined in the q-p= and -lnp= planes. Mathematical expressions for critical state stress ratio and specific volume are proposed to incorporate the evolution of particle breakage during monotonic shearing. In this paper, an elastoplastic constitutive model based on the critical state soil mechanics framework is presented …
Axial Compressive Behaviour Of Gfrp Tube Reinforced Concrete Columns, Muhammad N. S Hadi, Weiqiang Wang, M Neaz Sheikh
Axial Compressive Behaviour Of Gfrp Tube Reinforced Concrete Columns, Muhammad N. S Hadi, Weiqiang Wang, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents an innovative reinforcing scheme for concrete columns using glass fibre reinforced polymer (GFRP) tubes. GFRP tubes (solid and perforated) have been placed into concrete columns to provide reinforcement in both longitudinal and transverse directions. In this study, 14 columns with 150 mm diameter and 300 mm height have been cast and tested under axial compression. The columns have been divided into seven groups; each group contains two columns. The first group of columns are the reference columns without any reinforcement. The other six groups of columns are reinforced with solid and perforated (axially and diagonally) GFRP tubes. …
Energy Absorption And Impact Response Of Gfrp Reinforced Concrete Beams, M W. Goldston, A M. Remennikov, M N. Sheikh
Energy Absorption And Impact Response Of Gfrp Reinforced Concrete Beams, M W. Goldston, A M. Remennikov, M N. Sheikh
Faculty of Engineering and Information Sciences - Papers: Part A
It has been demonstrated that glass fibre-reinforced polymer (GFRP) bars is a suitable alternative to traditional steel reinforcement in concrete structures. GFRP bars are a competitive reinforcing option in reinforced concrete members subjected to flexure and shear. GFRP has compelling physical and mechanical properties, corrosion resistance and electromagnetic transparency. The use of GFRP reinforcement is particularly attractive for structures that operate in aggressive environments, such as in coastal regions, or for buildings that host magnetic resonance imaging (MRT) units or other equipment sensitive to electromagnetic fields. However its behaviour under impact loading is not adequately known. This study involved testing …
A Systematic Approach To High And Stable Discharge Capacity For Scaling Up The Lithium-Sulfur Battery, Mohammad Rejaul Kaiser, Jiazhao Wang, Xin Liang, Hua-Kun Liu, Shi-Xue Dou
A Systematic Approach To High And Stable Discharge Capacity For Scaling Up The Lithium-Sulfur Battery, Mohammad Rejaul Kaiser, Jiazhao Wang, Xin Liang, Hua-Kun Liu, Shi-Xue Dou
Faculty of Engineering and Information Sciences - Papers: Part A
A systematic approach to improving the performance of the Li-S battery is presented, based on applying high energy ball milling to create a porous sulfur-carbon composite, insertion of a free-standing layer, and adoption of a new charging method. Surface area analysis and field emission scanning electron microscope imaging show that the ball-milled sulfur powder has a porous structure and very high specific surface area. A vacuum-filtrated single-walled carbon nanotube free-standing layer is inserted in between the sulfur cathode and the separator. It is believed that high-surface-area porous sulfur will help to increase the conductivity of the elemental sulfur due to …
3d-Mesa 'Bridge' Silicon Microdosimeter: Charge Collection Study And Application To Rbe Studies In 12c Radiation Therapy, Linh T. Tran, Lachlan Chartier, Dale A. Prokopovich, Mark I. Reinhard, Marco Petasecca, Susanna Guatelli, Michael L. F Lerch, Vladimir L. Perevertaylo, Marco Zaider, Naruhiro Matsufuji, Michael Jackson, Mitchell Nancarrow, Anatoly B. Rosenfeld
3d-Mesa 'Bridge' Silicon Microdosimeter: Charge Collection Study And Application To Rbe Studies In 12c Radiation Therapy, Linh T. Tran, Lachlan Chartier, Dale A. Prokopovich, Mark I. Reinhard, Marco Petasecca, Susanna Guatelli, Michael L. F Lerch, Vladimir L. Perevertaylo, Marco Zaider, Naruhiro Matsufuji, Michael Jackson, Mitchell Nancarrow, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
Microdosimetry is an extremely useful technique, used for dosimetry in unknown mixed radiation fields typical of space and aviation, as well as in hadron therapy. A new silicon microdosimeter with 3D sensitive volumes has been proposed to overcome the shortcomings of the conventional Tissue Equivalent Proportional Counter. In this article, the charge collection characteristics of a new 3D mesa microdosimeter were investigated using the ANSTO heavy ion microprobe utilizing 5.5 MeV rm He2 + and 2 MeV rm H + ions. Measurement of the microdosimetric characteristics allowed for the determination of the Relative Biological Effectiveness of the 12rm C …
Improvements In The Dispersion Of Nanosilver In A Mgb2 Matrix Through A Graphene Oxide Net, Mislav Mustapic, Kaludewa S. B. De Silva, Seyed H. Aboutalebi, Shaon Barua, Xun Xu, Jianli Wang, Md Shariar Hossain, Josip Horvat, Shi Xue Dou
Improvements In The Dispersion Of Nanosilver In A Mgb2 Matrix Through A Graphene Oxide Net, Mislav Mustapic, Kaludewa S. B. De Silva, Seyed H. Aboutalebi, Shaon Barua, Xun Xu, Jianli Wang, Md Shariar Hossain, Josip Horvat, Shi Xue Dou
Faculty of Engineering and Information Sciences - Papers: Part A
The effects of graphene oxide (GO) addition on the dispersion of nanosilver (Ag) in an MgB2 matrix were studied using bulk samples prepared through a diffusion process. The influence of the dispersion of Ag and Ag/GO particles on the critical current density (Jc) of MgB2 was also investigated. GO has emerged as an excellent dopant which can significantly improve both the low- and high-field performance of MgB2 due to its capability to improve intergrain connectivity (GO) and inter- and intragrain pinning (GO and AgMg). The addition of nanosize Ag particles also results in an improvement of vortex pinning, and at …
Brittle Versus Ductile Fracture Behaviour In Nanotwinned Fcc Crystals, Linqing Pei, Cheng Lu, A Kiet Tieu, Xing Zhao, Liang Zhang, Kuiyu Cheng, Guillaume Michal
Brittle Versus Ductile Fracture Behaviour In Nanotwinned Fcc Crystals, Linqing Pei, Cheng Lu, A Kiet Tieu, Xing Zhao, Liang Zhang, Kuiyu Cheng, Guillaume Michal
Faculty of Engineering and Information Sciences - Papers: Part A
Molecular dynamic simulation (MD) was used to study the brittle versus ductile fracture behaviour in nanotwinned Face Centred Cubic (FCC) crystals subjected to the uniaxial tensile deformation. A fundamental brittle versus ductile fracture is observed, which can be mainly understood in terms of the ratio of surface energy to unstable stacking fault energy or the ratio of ideal tensile strength to ideal shear strength in atomic model with a confined range of twinning spacing. Results show that the small ratio value is favourable for the brittle fracture, and vice versa, the big one supports the ductile fracture.
Hydrostatic Pressure Induced Transition From Δtc To Δℓ Pinning Mechanism In Mgb2, Babar Shabbir, Xiaolin Wang, Shaban Reza Ghorbani, S X. Dou, Feixiang Xiang
Hydrostatic Pressure Induced Transition From Δtc To Δℓ Pinning Mechanism In Mgb2, Babar Shabbir, Xiaolin Wang, Shaban Reza Ghorbani, S X. Dou, Feixiang Xiang
Faculty of Engineering and Information Sciences - Papers: Part A
The impact of hydrostatic pressure up to 1.2 GPa on the critical current density (Jc) and the nature of the pinning mechanism in MgB2 have been investigated within the framework of the collective theory. We found that the hydrostatic pressure can induce a transition from the regime where pinning is controlled by spatial variation in the critical transition temperature (δTc ) to the regime controlled by spatial variation in the mean free path (δℓ). Furthermore, critical temperature (Tc) and low field Jc are slightly reduced, although the Jc drops more quickly at high fields than at ambient pressure. We found …
Dependence Of Texture Development On The Grain Size Of Tertiary Oxide Scales Formed On A Microalloyed Steel, Xianglong Yu, Zhengyi Jiang, Jingwei Zhao, Dongbin Wei, Ji Zhou, Cunlong Zhou, Qingxue Huang
Dependence Of Texture Development On The Grain Size Of Tertiary Oxide Scales Formed On A Microalloyed Steel, Xianglong Yu, Zhengyi Jiang, Jingwei Zhao, Dongbin Wei, Ji Zhou, Cunlong Zhou, Qingxue Huang
Faculty of Engineering and Information Sciences - Papers: Part A
Both orientational and geometrical characteristics of grains in tertiary oxide scales have been quantitatively investigated using the electron backscatter diffraction (EBSD) technique. Phase and orientation mappings demonstrate that the {001} planes of magnetite and the {0001} planes of hematite are parallel to the direction of oxide growth. Pole figures (PFs) as scattering plots clearly display the direct correlation between the orientations and microstructure sites of magnetite grains. Magnetite grains develop a strong rotated cube texture component that shifts to the {100} component, whereas those with the grain size of 1-5. μm develop the {001} cube texture component. The refined magnetite …
Interface Analysis And Hot Deformation Behaviour Of A Novel Laminated Composite With High-Cr Cast Iron And Low Carbon Steel Prepared By Hot Compression Bonding, Zhengyi Jiang, Xingjian Gao, Sheng-Li Li, Hong Mei Zhang, Dengfu Chen, Jian Zhong Xu
Interface Analysis And Hot Deformation Behaviour Of A Novel Laminated Composite With High-Cr Cast Iron And Low Carbon Steel Prepared By Hot Compression Bonding, Zhengyi Jiang, Xingjian Gao, Sheng-Li Li, Hong Mei Zhang, Dengfu Chen, Jian Zhong Xu
Faculty of Engineering and Information Sciences - Papers: Part A
A hot compression bonding process was developed to prepare a novel laminated composite consisting of high-Cr cast iron (HCCI) as the inner layer and low carbon steel (LCS) as the outer layers on a Gleeble 3500 thermomechanical simulator at a temperature of 950 °C and a strain rate of 0.001 S-1. Interfacial bond quality and hot deformation behaviour of the laminate were studied by microstructural characterisation and mechanical tests. Experimental results show that the metallurgical bond between the constituent metals was achieved under the proposed bonding conditions without discernible defects and the formation of interlayer or intermetallic layer …
In Vivo Endorectal Dosimetry Of Prostate Tomotherapy Using Dual Moskin Detectors, Sarah J. Alnaghy, Shrikant Deshpande, Dean L. Cutajar, Kemal Berk, Peter Metcalfe, Anatoly B. Rosenfeld
In Vivo Endorectal Dosimetry Of Prostate Tomotherapy Using Dual Moskin Detectors, Sarah J. Alnaghy, Shrikant Deshpande, Dean L. Cutajar, Kemal Berk, Peter Metcalfe, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
Verification of dose to the anterior rectal wall in helical tomotherapy to the prostate is important due to the close proximity of the rectal wall to the treatment field. The steep dose gradient makes these measurements challenging. A phantom-based study was completed, aimed at developing a system for measurement of anterior rectal wall doses during hypofractionated prostate stereotactic body radiotherapy (SBRT) utilizing tomotherapy delivery. An array of four dual MOSkinTM dosimeters, spaced 1 cm apart, was placed on a replica Rectafix® immobilization spacer device. This Perspex probe is a more rigid alternative to rectal balloons, to improve geometric reproducibility. The …
Incorporating Robustness In Diagonally-Relaxed Orthogonal Projections Method For Proton Computed Tomography, Paniz Karbasi, Blake Schultze, Valentina Giacometti, Tia E. Plautz, Keith Schubert, Reinhard W. Schulte, Vladimir Bashkirov
Incorporating Robustness In Diagonally-Relaxed Orthogonal Projections Method For Proton Computed Tomography, Paniz Karbasi, Blake Schultze, Valentina Giacometti, Tia E. Plautz, Keith Schubert, Reinhard W. Schulte, Vladimir Bashkirov
Faculty of Engineering and Information Sciences - Papers: Part A
Iterative algorithms such as ART, DROP, and CARP are commonly used in reconstructing computed tomography images, but only account for errors in the measurements. Errors in the predicted path and intersection lengths, or even blocks of missing measurements can result in degraded image quality. Robust techniques allow for errors in other areas of the model and produce good images that show less sensitivity. In this paper we introduce a robust version of DROP and compare its performance advantages to the standard DROP algorithm on on real data.
Performance Evaluation Of Map Algorithms With Different Penalties, Object Geometries And Noise Levels, Yu-Jung Tsai, Alexandre B. Bousse, Matthias J. Ehrhardt, Brian F. Hutton, Simon R. Arridge, Kris Thielemans
Performance Evaluation Of Map Algorithms With Different Penalties, Object Geometries And Noise Levels, Yu-Jung Tsai, Alexandre B. Bousse, Matthias J. Ehrhardt, Brian F. Hutton, Simon R. Arridge, Kris Thielemans
Faculty of Engineering and Information Sciences - Papers: Part A
A new algorithm (LBFGS-B-PC) which combines ideas of two existing convergent reconstruction algorithms, relaxed separable paraboloidal surrogate (SPS) and limited-memory Broyden-Fletcher-Goldfarb-Shanno with boundary constraints (LBFGS-B), is proposed. Its performance is evaluated in terms of log-posterior value and regional recovery ratio. The results demonstrate the superior convergence speed of the proposed algorithm to relaxed SPS and LBFGS-B, regardless of the noise level, activity distribution, object geometry, and penalties.
A Subspace Projection Approach For Wall Clutter Mitigation In Through-The-Wall Radar Imaging, Fok Hing Chi Tivive, Abdesselam Bouzerdoum, Moeness Amin
A Subspace Projection Approach For Wall Clutter Mitigation In Through-The-Wall Radar Imaging, Fok Hing Chi Tivive, Abdesselam Bouzerdoum, Moeness Amin
Faculty of Engineering and Information Sciences - Papers: Part A
One of the main challenges in through-the-wall radar imaging (TWRI) is the strong exterior wall returns, which tend to obscure indoor stationary targets, rendering target detection and classification difficult, if not impossible. In this paper, an effective wall clutter mitigation approach is proposed for TWRI that does not require knowledge of the background scene nor does it rely on accurate modeling and estimation of wall parameters. The proposed approach is based on the relative strength of the exterior wall returns compared to behind-wall targets. It applies singular value decomposition to the data matrix constructed from the space-frequency measurements to identify …
Facilitating An Ant Colony Algorithm For Multi-Objective Data-Intensive Service Provisions, Lijuan Wang, Jun Shen, Junzhou Luo
Facilitating An Ant Colony Algorithm For Multi-Objective Data-Intensive Service Provisions, Lijuan Wang, Jun Shen, Junzhou Luo
Faculty of Engineering and Information Sciences - Papers: Part A
The explosion of enormous sources of digital data has led to greater dependence on data-intensive services. Applications based on data-intensive services have become one of the most challenging applications in cloud computing. The service provision, and in particular service composition, will face new challenges as the services and data grow. In this paper, we will evaluate an ant colony system to resolve the multi-objective data-intensive service composition problem. The algorithm for a multi-objective context will get a set of Pareto-optimal solutions considering two objectives at the same time: the total cost and the total execution time of a composite service.
A Short Identity-Based Proxy Ring Signature Scheme From Rsa, Maryam Rjabzadeh Asaar, Mahmoud Salmasizadeh, Willy Susilo
A Short Identity-Based Proxy Ring Signature Scheme From Rsa, Maryam Rjabzadeh Asaar, Mahmoud Salmasizadeh, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
Identity-based proxy ring signature concept was introduced by Cheng et al. in 2004. This primitive is useful where the privacy of proxy signers is required. In this paper, the first short provably secure identity-based proxy ring signature scheme from RSA assumption has been proposed. In addition, the security of the proposed scheme tightly reduces to the RSA assumption, and therefore, the proposed scheme has a proper advantage in security reduction compared to the ones from RSA. The proposed scheme not only outperforms the existing schemes in terms of efficiency and practicality, but also does not suffer from the proxy key …
High Strength And Ductility Of Ultrathin Laminate Foils Using Accumulative Roll Bonding And Asymmetric Rolling, Hailiang Yu, A Kiet Tieu, Syamsul Hadi, Cheng Lu, Ajit R. Godbole, Charlie Kong
High Strength And Ductility Of Ultrathin Laminate Foils Using Accumulative Roll Bonding And Asymmetric Rolling, Hailiang Yu, A Kiet Tieu, Syamsul Hadi, Cheng Lu, Ajit R. Godbole, Charlie Kong
Faculty of Engineering and Information Sciences - Papers: Part A
As product miniaturization is becoming widely popular, many microparts are being produced by microforming of sheets/foils, whose strength needs to be able to maintain structural stability of the micro-components. In addition, their strength and ductility of foils generally reduce with a reduction in the thickness due to the size effect. In this paper, we report the fabrication of an aluminum laminate foil using a combined process of accumulative roll bonding (ARB) and asymmetric rolling (AR). It was found that this improves both strength and ductility. TEM results show that the laminate structures produced by ARB develop an inhomogeneous microstructure with …
Numerical Simulations Of Response Of Tubular Steel Beams To Close-Range Explosions, Tuan D. Ngo, Damith Mohotti, Alex M. Remennikov, Brian Uy
Numerical Simulations Of Response Of Tubular Steel Beams To Close-Range Explosions, Tuan D. Ngo, Damith Mohotti, Alex M. Remennikov, Brian Uy
Faculty of Engineering and Information Sciences - Papers: Part A
A numerical study of hollow and concrete-filled square tubular steel columns subjected to near-field detonations has been undertaken and validated through the experimental results. The experiments used concrete-filled and hollow square tubular columns (100 x 5 mm SHS Grade C350) made out of cold-formed structural steel hollow sections (SHS) that were simply supported at both ends. High explosives TNT charges were placed above the top surface of the column at two different scaled standoff distances of 0.12 m/kg1/3 and 0.15 m/kg1/3. Failure patterns and permanent mid-span deformations were recorded and compared with the numerical analysis results. Arbitrary Lagrangian-Eulerian (ALE) formulations …
A Variance Inflation Factor And Backward Elimination Based Robust Regression Model For Forecasting Monthly Electricity Demand Using Climatic Variables, Dao Hoang Vu, Kashem M. Muttaqi, Ashish Agalgaonkar
A Variance Inflation Factor And Backward Elimination Based Robust Regression Model For Forecasting Monthly Electricity Demand Using Climatic Variables, Dao Hoang Vu, Kashem M. Muttaqi, Ashish Agalgaonkar
Faculty of Engineering and Information Sciences - Papers: Part A
Selection of appropriate climatic variables for prediction of electricity demand is critical as it affects the accuracy of the prediction. Different climatic variables may have different impacts on the electricity demand due to the varying geographical conditions. This paper uses multicollinearity and backward elimination processes to select the most appropriate variables and develop a multiple regression model for monthly forecasting of electricity demand. The former process is employed to reduce the collinearity between the explanatory variables by excluding the predictor which has highly linear relationship with the other independent variables in the dataset. In the next step, involving backward elimination …
Thermal Stability And Properties Of Deformation-Processed Cu-Fe In Situ Composites, Keming Liu, Zhengyi Jiang, Jingwei Zhao, Jin Zou, Lei Lu, Deping Lu
Thermal Stability And Properties Of Deformation-Processed Cu-Fe In Situ Composites, Keming Liu, Zhengyi Jiang, Jingwei Zhao, Jin Zou, Lei Lu, Deping Lu
Faculty of Engineering and Information Sciences - Papers: Part A
This paper investigated the thermal stability, tensile strength, and conductivity of deformation-processed Cu-14Fe in situ composites produced by thermo-mechanical processing. The thermal stability was analyzed using scanning electronic microscope and transmission electron microscope. The tensile strength and conductivity were evaluated using tensile-testing machine and micro-ohmmeter, respectively. The Fe fibers in the deformation-processed Cu-14Fe in situ composites undergo edge recession, longitudinal splitting, cylinderization, break-up, and spheroidization during the heat treatment. The Cu matrix experiences recovery, recrystallization, and precipitation phase transition. The tensile strength and conductivity first increase with increasing temperature of heat treatment, reach peak values at different temperatures, and then …
Gap Phenomena For A Class Of Fourth-Order Geometric Differential Operators On Surfaces With Boundary, Glen Wheeler
Gap Phenomena For A Class Of Fourth-Order Geometric Differential Operators On Surfaces With Boundary, Glen Wheeler
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper we establish a gap phenomenon for immersed surfaces with arbitrary codimension, topology and boundaries that satisfy one of a family of systems of fourth-order anisotropic geometric partial differential equations. Examples include Willmore surfaces, stationary solitons for the surface diffusion flow, and biharmonic immersed surfaces in the sense of Chen. On the boundary we enforce either umbilic or flat boundary conditions: that the tracefree second fundamental form and its derivative or the full second fundamental form and its derivative vanish. For the umbilic boundary condition we prove that any surface with small L2-norm of the tracefree second fundamental …
A Practical Path Planning Methodology For Wire And Arc Additive Manufacturing Of Thin-Walled Structures, Donghong Ding, Zengxi Pan, Dominic Cuiuri, Huijun Li
A Practical Path Planning Methodology For Wire And Arc Additive Manufacturing Of Thin-Walled Structures, Donghong Ding, Zengxi Pan, Dominic Cuiuri, Huijun Li
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a novel methodology to generate deposition paths for wire and arc additive manufacturing (WAAM). The medial axis transformation (MAT), which represents the skeleton of a given geometry, is firstly extracted to understand the geometry. Then a deposition path that is based on the MAT is efficiently generated. The resulting MAT-based path is able to entirely fill any given cross-sectional geometry without gaps. With the variation of step-over distance, material efficiency alters accordingly for both solid and thin-walled structures. It is found that thin-walled structures are more sensitive to step-over distance in terms of material efficiency. The optimal …