Absolute Phase Recovery Of Three Fringe Patterns With Selected Spatial Frequencies,
2015
Huazhong University of Science and Technology
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,
2015
University of Wollongong
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 …
Water Extraction From Mixed Liquor Of An Aerobic Bioreactor By Forward Osmosis: Membrane Fouling And Biomass Characteristics Assessment,
2015
University of Wollongong
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 encountered. …
Attenuation And Propagation Of Voltage Unbalance In Radial Distribution Networks,
2015
University of Wollongong
Attenuation And Propagation Of Voltage Unbalance In Radial Distribution Networks, Devinda Perera, Philip Ciufo, Lasantha G. Meegahapola, Sarath Perera
Faculty of Engineering and Information Sciences - Papers: Part A
Recently published International Electrotechnical Committee (IEC) technical reports IEC 61000-3-13 provides detailed methodologies for managing voltage unbalance (VU) in electric power systems. A key aspect in the VU emission allocation process is the estimation of VU propagation in different parts of the network. Although the VU propagation from upstream networks to downstream networks is adequately addressed, the attenuation of VU when propagating from downstream to upstream networks at the same voltage level has not been properly taken into account in the aforementioned methodologies. Furthermore, mains connected three-phase induction motors are known to attenuate VU, and there is no methodology currently …
Chemical Cleaning Effects On Properties And Separation Efficiency Of An Ro Membrane,
2015
University of Wollongong
Chemical Cleaning Effects On Properties And Separation Efficiency Of An Ro Membrane, Kha L. Tu, Allan R. Chivas, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study aims to investigate the impacts of chemical cleaning on the performance of a reverse osmosis membrane. Chemicals used for simulating membrane cleaning include a surfactant (sodium dodecyl sulfate, SDS), a chelating agent (ethylenediaminetetraacetic acid, EDTA), and two proprietary cleaning formulations namely MC3 and MC11. The impact of sequential exposure to multiple membrane cleaning solutions was also examined. Water permeability and the rejection of boron and sodium were investigated under various water fluxes, temperatures and feedwater pH. Changes in the membrane performance were systematically explained based on the changes in the charge density, hydrophobicity and chemical structure of the …
Characterization Of Smear Zone Caused By Mandrel Action,
2015
University of Wollongong
Characterization Of Smear Zone Caused By Mandrel Action, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Made Ardana
Faculty of Engineering and Information Sciences - Papers: Part A
In this study, the smear zone due to vertical drain installation is studied using a large, in situ sample to capture the realistic characteristics of the smear zone in relation to the in situ soil structure. The smear zone extent for Bulli clay (New South Wales, Australia) is quantified on the basis of normalised permeability and the reduction in the water content prior to consolidation. The permeability and compressibility of the soil are used to determine the extent to which the soil surrounding the PVD had become disturbed. In laboratory testing, the soil consolidation behavior due to a prefabricated vertical …
Field Investigation On Compaction And Strength Performance Of Two Coal Wash-Bos Slag Mixtures,
2015
University of Wollongong
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,
2015
University of Wollongong
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,
2015
University of Wollongong
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,
2015
University of Wollongong
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 …
Density Maximization For Improving Graph Matching With Its Applications,
2015
University of Wollongong
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 …
The Nuclear Dimension Of Graph C*-Algebras,
2015
University of Hawaii
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.
Structural Evolution Of Electrodes In The Ncr And Cgr Cathode-Containing Commercial Lithium-Ion Batteries Cycled Between 3.0 And 4.5 V: An Operando Neutron Powder-Diffraction Study,
2015
University of Wollongong
Structural Evolution Of Electrodes In The Ncr And Cgr Cathode-Containing Commercial Lithium-Ion Batteries Cycled Between 3.0 And 4.5 V: An Operando Neutron Powder-Diffraction Study, Wei Kong Pang, Moshiul Alam, Vanessa K. Peterson, Neeraj Sharma
Faculty of Engineering and Information Sciences - Papers: Part A
The dissimilar lattice-evolution of the isostructural layered Li(Ni,Co,Al)O2 (NCR) and Li(Ni,Co,Mn)O2 (CGR) cathodes in commercial lithium-ion batteries during overcharging/discharging was examined using operando neutron powder-diffraction. The stacking axis (c parameter) of both cathodes expands on initial lithiation and contracts on further lithiation. Although both the initial increase and later decrease are smaller for the CGR cathode, the overall change between battery charged and discharged states of the c parameter is larger for the CGR (1.29%) than for the NCR cathode (0.33%). We find these differences are correlated to the transition metal to oxygen bond (as measured through …
Brittle Versus Ductile Behaviour Of Nanotwinned Copper: A Molecular Dynamics Study,
2015
University of Wollongong
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,
2015
University of Minho
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,
2015
University of Wollongong
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 …
Twisted K-Graph Algebras Associated To Bratteli Diagrams,
2015
University of Wollongong
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 in the sense of Pask-Raeburn-Rørdam-Sims.
A New Insight Into Ductile Fracture Of Ultrafine-Grained Al-Mg Alloys,
2015
University of Wollongong
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 …
An Identity-Based Multi-Proxy Multi-Signature Scheme Without Bilinear Pairings And Its Variants,
2015
Sharif University of Technology
An Identity-Based Multi-Proxy Multi-Signature Scheme Without Bilinear Pairings And Its Variants, Maryam Rajabzadeh Asaar, Mahmoud Salmasizadeh, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
The notions of identity-based multi-proxy signature, proxy multi-signature and multi-proxy multisignature have been proposed to facilitate public key certificate management of these kinds of signatures by merely employing signer’s identities in place of the public keys and their certificates. In the literature, most identity-based multi-proxy signature, proxy multi-signature and multi-proxy multi-signature schemes are based on bilinear pairings. Without incorporating bilinear pairings, Tiwari and Padhye proposed an identity-based proxy multi-signature scheme in 2011. Subsequently, an identity-based multi-proxy multi-signature scheme was proposed byTiwari et al. in 2012. First, we review identity-based (multi)-proxy multi-signature schemes without bilinear pairings and show that unfortunately, they …
Observed And Predicted Behaviour Of Rail Ballast Under Monotonic Loading Capturing Particle Breakage,
2015
University of Wollongong
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 …
