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Articles 31 - 60 of 457

Full-Text Articles in Social and Behavioral Sciences

A Practical Path Planning Methodology For Wire And Arc Additive Manufacturing Of Thin-Walled Structures, Donghong Ding, Zengxi Pan, Dominic Cuiuri, Huijun Li Jan 2015

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 ...


Excellent Melt Lubrication Of Alkali Metal Polyphosphate Glass For High Temperature Applications, A Kiet Tieu, Shanhong Wan, Ning Kong, Qiang Zhu, Hongtao Zhu Jan 2015

Excellent Melt Lubrication Of Alkali Metal Polyphosphate Glass For High Temperature Applications, A Kiet Tieu, Shanhong Wan, Ning Kong, Qiang Zhu, Hongtao Zhu

Faculty of Engineering and Information Sciences - Papers: Part A

A new class of high temperature lubricant of inorganic alkali metal polyphosphate was developed for hot metal forming, which involved a fundamental knowledge of melt lubrication. At elevated temperature a 55% reduction in friction and a 50% decrease in wear were achieved by the presence of the molten polyphosphate lubrication, as well as the excellent anti-oxidation capability at the rubbing steel/steel interface, which closely correlated with the tribo-induced hierarchical structure at the rubbing interface. This inorganic polyphosphate lubricant can be called a smart polymeric material, which will be an eco-friendly alternative for high temperature applications. This journal is


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 Jan 2015

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 ...


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 Jan 2015

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 ...


Effect Of Temperature On Microstructure And Deformation Mechanism Of Fe-30mn-3si-4al Twip Steel At Strain Rate Of 700 S-1, Zhiping Xiong, Xue-Ping Ren, Jian Shu, Zhe-Lei Wang, Wei-Ping Bao, Shu-Xia Li Jan 2015

Effect Of Temperature On Microstructure And Deformation Mechanism Of Fe-30mn-3si-4al Twip Steel At Strain Rate Of 700 S-1, Zhiping Xiong, Xue-Ping Ren, Jian Shu, Zhe-Lei Wang, Wei-Ping Bao, Shu-Xia Li

Faculty of Engineering and Information Sciences - Papers: Part A

As twinning-induced plasticity (TWIP) steel is one potential material for shaped charge liner due to the combination of high strength and high plasticity, deformation mechanism at high strain rate and high temperature is required to study. Compression experiments of Fe-30Mn-3Si-4Al TWIP steel were conducted using a Gleeble-1500 thermal simulation machine and a split-Hopkinson pressure bar (SHPB) between 298 and 1073 K at strain rates of 10-3 and 700 s-1, respectively. Microstructures were observed using optical microscopy (OM) and transmission electron microscopy (TEM). Results show that flow stress and densities of deformation twins and dislocations decrease with increasing deformation temperature at ...


In Situ Powder Diffraction Studies Of Electrode Materials In Rechargeable Batteries, Neeraj Sharma, Wei Kong Pang, Zaiping Guo, Vanessa K. Peterson Jan 2015

In Situ Powder Diffraction Studies Of Electrode Materials In Rechargeable Batteries, Neeraj Sharma, Wei Kong Pang, Zaiping Guo, Vanessa K. Peterson

Faculty of Engineering and Information Sciences - Papers: Part A

The ability to directly track the charge carrier in a battery as it inserts/extracts from an electrode during charge/discharge provides unparalleled insight for researchers into the working mechanism of the device. This crystallographic-electrochemical information can be used to design new materials or modify electrochemical conditions to improve battery performance characteristics, such as lifetime. Critical to collecting operando data used to obtain such information insitu while a battery functions are X-ray and neutron diffractometers with sufficient spatial and temporal resolution to capture complex and subtle structural changes. The number of operando battery experiments has dramatically increased in recent years ...


Twisted K-Graph Algebras Associated To Bratteli Diagrams, David Pask, Adam Sierakowski, Aidan Sims Jan 2015

Twisted K-Graph Algebras Associated To Bratteli Diagrams, David Pask, Adam Sierakowski, Aidan Sims

Faculty of Engineering and Information Sciences - Papers: Part A

2015 Springer Basel Given a system of coverings of k-graphs, we show that the second cohomology of the resulting (k + 1)-graph is isomorphic to that of any one of the k-graphs in the system, and compute the semifinite traces of the resulting twisted (k + 1)-graph C*-algebras. We then consider Bratteli diagrams of 2-graphs whose twisted C*-algebras are matrix algebras over noncommutative tori. For such systems we calculate the ordered K-theory of the resulting twisted 3-graph C*-algebras. We deduce that every such C*-algebra is Morita equivalent to the C*-algebra of a rank-2 Bratteli diagram ...


V2o5/Mesoporous Carbon Composite As A Cathode Material For Lithium-Ion Batteries, Mohammad Ihsan, Qing Meng, Li Li, Dan Li, Hongqiang Wang, Kuok Hau Seng, Zhixin Chen, Shane J. Kennedy, Zaiping Guo, Hua-Kun Liu Jan 2015

V2o5/Mesoporous Carbon Composite As A Cathode Material For Lithium-Ion Batteries, Mohammad Ihsan, Qing Meng, Li Li, Dan Li, Hongqiang Wang, Kuok Hau Seng, Zhixin Chen, Shane J. Kennedy, Zaiping Guo, Hua-Kun Liu

Faculty of Engineering and Information Sciences - Papers: Part A

V2O5/mesoporous carbon composite has been prepared by an ultrasonically assisted method followed by a sintering process. The as-prepared V2O5/mesoporous carbon material containing 90 wt% V2O5 shows better electrochemical performance, with capacity of 163 mA h g-1 after 100 cycles at the current density of 500 mA g-1, as well as better charge/discharge rate capability for lithium storage than V2O5 nanoparticles. The improved electrochemical performance indicates that the V2O5/mesoporous carbon composite could be used as a promising cathode material for ...


Strengthening Mechanisms In Thermomechanically Processed Nbti-Microalloyed Steel, Andrii Kostryzhev, Olexandra Marenych, Chris R. Killmore, Elena V. Pereloma Jan 2015

Strengthening Mechanisms In Thermomechanically Processed Nbti-Microalloyed Steel, Andrii Kostryzhev, Olexandra Marenych, Chris R. Killmore, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

The effect of deformation temperature on microstructure and mechanical properties was investigated for thermomechanically processed NbTi-microalloyed steel with ferrite-pearlite microstructure. With a decrease in the finish deformation temperature at 1348 K to 1098 K (1075 °C to 825 °C) temperature range, the ambient temperature yield stress did not vary significantly, work hardening rate decreased, ultimate tensile strength decreased, and elongation to failure increased. These variations in mechanical properties were correlated to the variations in microstructural parameters (such as ferrite grain size, solid solution concentrations, precipitate number density and dislocation density). Calculations based on the measured microstructural parameters suggested the grain ...


Analysis Of Thin Strip Profile By Work Roll Crossing And Shifting In Asymmetrical Cold Rolling, Abdulrahman Aljabri, Zhengyi Jiang, Dongbin Wei Jan 2015

Analysis Of Thin Strip Profile By Work Roll Crossing And Shifting In Asymmetrical Cold Rolling, Abdulrahman Aljabri, Zhengyi Jiang, Dongbin Wei

Faculty of Engineering and Information Sciences - Papers: Part A

In order to analyze the effects of cold rolling parameters such as the crossing angle and axial shifting value of work rolls on the strip profile, extensive tests were carried out on a 4-high rolling mill equipped with a work roll crossing and shifting system. The results show that the strip profile is nearly flat under asymmetrical rolling. The rolling force was also analyzed in detail by changing the crossing angle and axial shifting value of work rolls.


An Agent-Mediated Platform For Business Processes, Hoa Khanh Dam, Aditya Ghose, Mohammad Qasim Jan 2015

An Agent-Mediated Platform For Business Processes, Hoa Khanh Dam, Aditya Ghose, Mohammad Qasim

Faculty of Engineering and Information Sciences - Papers: Part A

Business processes have been widely becoming crucial assets of organisations across various industries and domains. The flexibility in dealing with changes when business processes are executed has significant impact on the success of an organisation's business operations, especially in the current ever-changing business environment. In this context, agent-based systems offer a promisingly powerful platform for business process execution. In this paper, the authors propose an agent-mediated platform for business processes with the aim to contribute to bridge the gap between business process management and agent-oriented development. They present a conceptual mapping method for a seamless transition from business process ...


In-Situ Formation And Densification Of Mgal2o4-Smalo3 Ceramics By A Single-Stage Reaction Sintering Process, Beiyue Ma, Yue Yin, Qiang Zhu, Ying Li, Guangqiang Li, Jingkun Yu Jan 2015

In-Situ Formation And Densification Of Mgal2o4-Smalo3 Ceramics By A Single-Stage Reaction Sintering Process, Beiyue Ma, Yue Yin, Qiang Zhu, Ying Li, Guangqiang Li, Jingkun Yu

Faculty of Engineering and Information Sciences - Papers: Part A

Stoichiometric magnesium aluminate spinel (MgAl2O4, MA)-samarium aluminate (SmAlO3, SA) ceramics have been prepared at 1580°C for 4h from calcined magnesia (MgO), commercial alumina (Al2O3) and samarium oxide (Sm2O3) by a single-stage in-situ reaction sintering (SIRS) method. The phase compositions, microstructures, shrinkage ratio, bulk density and cold compressive strength of the MA-SA ceramics have been investigated. The ceramics with 2.5 - 7.5 wt. % Sm2O3 are composed of MA and SA phases. The microstructures of the ceramics are dense. MA particles exist as angular shape, and ...


A Multi-Agent Framework For Packet Routing In Wireless Sensor Networks, Dayong Ye, Minjie Zhang, Yun Yang Jan 2015

A Multi-Agent Framework For Packet Routing In Wireless Sensor Networks, Dayong Ye, Minjie Zhang, Yun Yang

Faculty of Engineering and Information Sciences - Papers: Part A

No abstract provided.


Block Shear Failure Planes Of Bolted Connections - Direct Experimental Verifications, Lip H. Teh, Mehmet E. Uz Jan 2015

Block Shear Failure Planes Of Bolted Connections - Direct Experimental Verifications, Lip H. Teh, Mehmet E. Uz

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents direct experimental verifications of the active shear planes in bolted connections, previously identified by the first author for determining the block shear capacity. The laboratory test results were obtained by independent researchers for specimens where the applied loads were resisted by the "block" in shear only. The first set consists of five bolted connection specimens in the webs of wide flange sections where the tensile resistance planes had been sawn off. The second set consists of ten bolted connection specimens each in one leg of an angle section that had fractured completely along the net tensile plane ...


The Role Of Pyrimidine And Water As Underlying Molecular Constituents For Describing Radiation Damage In Living Tissue: A Comparative Study, Martina C. Fuss, L Ellis-Gibbings, Darryl B. Jones, M J. Brunger, Francisco Blanco, A Muñoz, Paulo Limao-Vieira, Gustavo Garcia Jan 2015

The Role Of Pyrimidine And Water As Underlying Molecular Constituents For Describing Radiation Damage In Living Tissue: A Comparative Study, Martina C. Fuss, L Ellis-Gibbings, Darryl B. Jones, M J. Brunger, Francisco Blanco, A Muñoz, Paulo Limao-Vieira, Gustavo Garcia

Faculty of Engineering and Information Sciences - Papers: Part A

Water is often used as the medium for characterizing the effects of radiation on living tissue. However, in this study, charged-particle track simulations are employed to quantify the induced physicochemical and potential biological implications when a primary ionising particle with energy 10 keV strikes a medium made up entirely of water or pyrimidine. Note that pyrimidine was chosen as the DNA/RNA bases cytosine, thymine, and uracil can be considered pyrimidine derivatives. This study aims to assess the influence of the choice of medium on the charged-particle transport, and identify how appropriate it is to use water as the default ...


A Multi-Objective Design Optimization Strategy For Vertical Ground Heat Exchangers, Su Huang, Zhenjun Ma, Fenghao Wang Jan 2015

A Multi-Objective Design Optimization Strategy For Vertical Ground Heat Exchangers, Su Huang, Zhenjun Ma, Fenghao Wang

Faculty of Engineering and Information Sciences - Papers: Part A

A multi-objective design optimization strategy for vertical U-tube ground heat exchangers (GHEs) is presented to minimize the system upfront cost and entropy generation number simultaneously. Five design variables of vertical U-tube GHEs, including borehole number, borehole depth, borehole radius, U-tube outer radius and fluid mass flow rate, are first selected via a global sensitivity analysis method, and then optimized by a genetic algorithm (GA) optimizer implemented in MATLAB. Based on the Pareto frontier obtained from the GA optimization, a decision-making strategy is then used to determine a final solution. Two case studies are presented to validate the effectiveness of the ...


Gap Phenomena For A Class Of Fourth-Order Geometric Differential Operators On Surfaces With Boundary, Glen Wheeler Jan 2015

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 ...


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 Jan 2015

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 ...


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 Jan 2015

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 ...


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 Jan 2015

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.


Implications Of Ballast Degradation Under Cyclic Loading, Sanjay Nimbalkar, Buddhima Indraratna Jan 2015

Implications Of Ballast Degradation Under Cyclic Loading, Sanjay Nimbalkar, Buddhima Indraratna

Faculty of Engineering and Information Sciences - Papers: Part A

In spite of recent advances in track geotechnology, the understanding of the mechanisms of ballast degradation is vital for improved design to withstand high speed cyclic loading. The research conducted at Centre for Geomechanics and Railway Engineering (CGRE) at University of Wollongong (UOW) has shown that ballast degradation is influenced by various factors including the amplitude, frequency, number of load cycles, particle size distribution, confining pressure, angularity and fracture strength of individual grains. A series of cyclic drained triaxial tests were conducted using a largescale cylindrical apparatus designed and built at UOW for frequencies ranging from 10-40 Hz. A low ...


Absolute Phase Recovery Of Three Fringe Patterns With Selected Spatial Frequencies, Yi Ding, Jiangtao Xi, Yanguang Yu, Fuqin Deng Jan 2015

Absolute Phase Recovery Of Three Fringe Patterns With Selected Spatial Frequencies, Yi Ding, Jiangtao Xi, Yanguang Yu, Fuqin Deng

Faculty of Engineering and Information Sciences - Papers: Part A

A new temporal approach is presented for the recovery of the absolute phase maps from their wrapped versions based on the use of fringe patterns of three different spatial frequencies. In contrast to the two-frequency method recently published, the method proposed is characterized by better anti-error capability as measured by phase error tolerance bound. A general rule for the selection of the three frequencies is presented, and its relationship to the phase error tolerance bound is derived. Theoretical analysis and experimental results are also presented to validate the effectiveness of the proposed three frequency technique.


Improving The Laboratory Learning Experience: A Process To Train And Manage Teaching Assistants, Sasha Nikolic, Peter J. Vial, Montserrat Ros, David Stirling, Christian H. Ritz Jan 2015

Improving The Laboratory Learning Experience: A Process To Train And Manage Teaching Assistants, Sasha Nikolic, Peter J. Vial, Montserrat Ros, David Stirling, Christian H. Ritz

Faculty of Engineering and Information Sciences - Papers: Part A

This paper describes in detail a successful training program developed for sessional (part-time or nonpermanent) laboratory demonstrators employed in the Electrical Engineering Department of an Australian university. Such demonstrators play an important role in teaching practical concepts and skills in engineering. The success of the program relies on a centralized approach coordinated by a carefully selected Laboratory Manager responsible for the recruitment, allocation, training, and development of sessional teachers, and for assessing student satisfaction with them. The paper examines the overall impact of the program on these teachers': 1) introducing laboratory material; 2) preparation; 3) communication; 4) interest in student ...


A Sacrificial-Layer Approach To Fabricate Polysulfone Support For Forward Osmosis Thin-Film Composite Membranes With Reduced Internal Concentration Polarisation, Peipei Xiao, Long D. Nghiem, Yong Yin, Xue-Mei Li, Mengxi Zhang, Gang Chen, Jianfeng Song, Tao He Jan 2015

A Sacrificial-Layer Approach To Fabricate Polysulfone Support For Forward Osmosis Thin-Film Composite Membranes With Reduced Internal Concentration Polarisation, Peipei Xiao, Long D. Nghiem, Yong Yin, Xue-Mei Li, Mengxi Zhang, Gang Chen, Jianfeng Song, Tao He

Faculty of Engineering and Information Sciences - Papers: Part A

This study demonstrates a sacrificial-layer approach by co-casting, which is the simultaneous casting of two layers, to prepare a polysulfone support (denoted as PSfco) layer with open bottom surface morphology for fabricating thin-film composite forward osmosis (FO) membranes. In the co-casting process, polyetherimide (PEI), used as the sacrificial layer, was co-cast beneath the PSf layer. After the PEI layer was peeled off, PSfco was yielded with an open-bottom structure. Results showed that under the same operating condition, the FO membrane prepared by co-casting (denoted as PSfco-TFC) demonstrated a 10% higher water flux using 0.5 M NaCl draw solution and ...


Water Extraction From Mixed Liquor Of An Aerobic Bioreactor By Forward Osmosis: Membrane Fouling And Biomass Characteristics Assessment, Wenhai Luo, Faisal I. Hai, William E. Price, Long D. Nghiem Jan 2015

Water Extraction From Mixed Liquor Of An Aerobic Bioreactor By Forward Osmosis: Membrane Fouling And Biomass Characteristics Assessment, Wenhai Luo, Faisal I. Hai, William E. Price, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part A

This study investigated membrane fouling and biomass characteristics during water extraction from mixed liquor of an aerobic bioreactor by a submerged forward osmosis (FO) system. As the sludge concentration in the reactor increased from 0 to 20 g/L, fouling of the FO membrane increased but was much less severe than that of a reference microfiltration membrane. The results also indicate that aeration can be used to effectively control membrane fouling. By increasing the draw solute concentration, as expected, the initial water flux was increased. However, there appears to be a critical water flux above which severe membrane fouling was ...


Density Maximization For Improving Graph Matching With Its Applications, Chao Wang, Lei Wang, Lingqiao Liu Jan 2015

Density Maximization For Improving Graph Matching With Its Applications, Chao Wang, Lei Wang, Lingqiao Liu

Faculty of Engineering and Information Sciences - Papers: Part A

Graph matching has been widely used in both image processing and computer vision domain due to its powerful performance for structural pattern representation. However, it poses three challenges to image sparse feature matching: 1) the combinatorial nature limits the size of the possible matches; 2) it is sensitive to outliers because its objective function prefers more matches; and 3) it works poorly when handling many-to-many object correspondences, due to its assumption of one single cluster of true matches. In this paper, we address these challenges with a unified framework called density maximization (DM), which maximizes the values of a proposed ...


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 Jan 2015

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 ...


The Nuclear Dimension Of Graph C*-Algebras, Efren Ruiz, Aidan Sims, Mark Tomforde Jan 2015

The Nuclear Dimension Of Graph C*-Algebras, Efren Ruiz, Aidan Sims, Mark Tomforde

Faculty of Engineering and Information Sciences - Papers: Part A

Consider a graph C⁎C⁎-algebra C⁎(E)C⁎(E) with a purely infinite ideal I (possibly all of C⁎(E)C⁎(E)) such that I has only finitely many ideals and C⁎(E)/IC⁎(E)/I is approximately finite dimensional. We prove that the nuclear dimension of C⁎(E)C⁎(E) is 1. If I has infinitely many ideals, then the nuclear dimension of C⁎(E)C⁎(E) is either 1 or 2.


Von Neumann Algebras Of Strongly Connected Higher-Rank Graphs, Marcelo Laca, Nadia S. Larsen, Sergey Neshveyev, Aidan Sims, Samuel B. Webster Jan 2015

Von Neumann Algebras Of Strongly Connected Higher-Rank Graphs, Marcelo Laca, Nadia S. Larsen, Sergey Neshveyev, Aidan Sims, Samuel B. Webster

Faculty of Engineering and Information Sciences - Papers: Part A

We investigate the factor types of the extremal KMS states for the preferred dynamics on the Toeplitz algebra and the Cuntz-Krieger algebra of a strongly connected finite (Formula presented.)-graph. For inverse temperatures above 1, all of the extremal KMS states are of type (Formula presented.). At inverse temperature 1, there is a dichotomy: if the (Formula presented.)-graph is a simple (Formula presented.)-dimensional cycle, we obtain a finite type (Formula presented.) factor; otherwise we obtain a type III factor, whose Connes invariant we compute in terms of the spectral radii of the coordinate matrices and the degrees of ...


Symmetries And Solutions Of The Non-Autonomous Von Bertalanffy Equation, Maureen P. Edwards, R Anderssen Jan 2015

Symmetries And Solutions Of The Non-Autonomous Von Bertalanffy Equation, Maureen P. Edwards, R Anderssen

Faculty of Engineering and Information Sciences - Papers: Part A

For growth in a closed environment, which is indicative of the situation in laboratory experiments, autonomous ODE models do not necessarily capture the dynamics under investigation. The importance and impact of a closed environment arise when the question under examination relates, for example, to the number of the surviving microbes, such as in a study of the spoilage and contamination of food, the gene silencing activity of fungi or the production of a chemical compound by bacteria or fungi. Autonomous ODE models are inappropriate as they assume that only the current size of the population controls the growth-decay dynamics. This ...