Open Access. Powered by Scholars. Published by Universities.®
Social and Behavioral Sciences Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 31 - 60 of 86
Full-Text Articles in Social and Behavioral Sciences
Mechanics Of Cold Rolling Of Thin Strip, Zhengyi Jiang
Mechanics Of Cold Rolling Of Thin Strip, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part A
Cold rolled thin strip has a wide application in electronic and instrument industries, and its production has always been of major interest to the manufacturers and researchers in the area of metal plasticity. Thin strip rolling involves significant metal plasticity to produce a desired product. Iwamoto (2004), Stoughton & Yoon (2004) and Hub et al. (2004) were interested in dealing with the plastic defonnation and plastic yielding of steel, and its micromechanics. With the need for higher quality and productivity in cold strip mill, mathematical models of cold rolling of a strip with a desired shape and dimension, both for …
Robust And Intelligent Control Methods To Improve The Performance Of A Unified Power Flow Controller, C Benachaiba, Ahmed M. Haidar, M L. Doumbia
Robust And Intelligent Control Methods To Improve The Performance Of A Unified Power Flow Controller, C Benachaiba, Ahmed M. Haidar, M L. Doumbia
Faculty of Engineering and Information Sciences - Papers: Part A
The important factor disturbing the modern power systems today is load flow control. The Unified Power Flow Controller (UPFC) is an effective way for controlling the power flow and can provide damping capability during transient conditions. The UPFC is controlled conventionally using PI controller. This paper presents two robust controllers to improve the performance of the UPFC. The first is a RST controller based on the principle of pole placement and the second is an intelligent controller based on the principle of fuzzy logic optimized by Genetic Algorithm (GA).
Services For Business Processes In Ea - Are They In Relation?, Lam-Son Lê
Services For Business Processes In Ea - Are They In Relation?, Lam-Son Lê
Faculty of Engineering and Information Sciences - Papers: Part A
Business services arguably play a central role in service-based information systems as they would fill in the gap between the technicality of Service-Oriented Architecture and the business processes captured in Enterprise Architecture. Business services have distinctive features that are not typically observed in plain Web services. The representation of business services requires that we view human activity and human-mediated functionality through the lens of computing and systems engineering. We give insights into the modeling of business services and relationships between them. This work sheds light on the analysis, design and reusability of business-aware services that business owners, entrepreneurs and business …
Study On Oxidation Of Stainless Steels During Hot Rolling, Z Y. Jiang, D B. Wei, K Tieu, J X. Huang, A W. Zhang, X Shi, S H. Jiao
Study On Oxidation Of Stainless Steels During Hot Rolling, Z Y. Jiang, D B. Wei, K Tieu, J X. Huang, A W. Zhang, X Shi, S H. Jiao
Faculty of Engineering and Information Sciences - Papers: Part A
The oxidation of stainless steels 304 and 304L during hot rolling is studied in this paper. Results show the oxide scale thickness decreases significantly with an increase of reduction, and the oxide scales of both 304 and 304L stainless steels were found more deformable than the steel substrate. Surface roughness shows a complicated transfer during the hot rolling process due to the complexity of oxide scale characteristics. Also, surface roughness decreases with an increase of reduction. The friction coefficient increases with reduction in all cases, and the increase is more significant in the case of the 304 stainless steel than …
Offline Programming For Short Batch Robotic Welding, Nathan Larkin, Aleksandar Milojevic, Zengxi Pan, Joseph Polden, John Norrish
Offline Programming For Short Batch Robotic Welding, Nathan Larkin, Aleksandar Milojevic, Zengxi Pan, Joseph Polden, John Norrish
Faculty of Engineering and Information Sciences - Papers: Part A
Robotics based automation has many advantages over both manual operation and dedicated hard automation. In practice however the robot programming overhead and high cost of dedicated jigging are serious impediments to its use for short production runs. Offline programming packages offer an attractive alternative to reduce programming time and robot down time, however many of the available packages are fairly complex and treat the geometric programming and welding operation separately. The paper will describe the development of alternative approaches and the evaluation of an integrated offline robotic welding package (RinasWeld) which addresses these issues and makes low volume robotic welding …
Development Of A Dc-Lsnd Welding Process For Gmaw On Dh-36 Steel, Raymond Holder, Nathan Larkin, Huijun Li, Lenka Kuzmikova, Zengxi Pan, John Norrish
Development Of A Dc-Lsnd Welding Process For Gmaw On Dh-36 Steel, Raymond Holder, Nathan Larkin, Huijun Li, Lenka Kuzmikova, Zengxi Pan, John Norrish
Faculty of Engineering and Information Sciences - Papers: Part A
Weld induced distortion correction is a major cost within the shipbuilding industry. This paper investigates the use of an active cooling process known as Dynamically Controlled - Low Stress No Distortion (DC-LSND) Welding on DH-36 steel. Thermal profiles are obtained and distortion measurements are also achieved. Results show that the application of a localised cryogenic cooling source trailing the welding arc can significantly reduce weld induced distortion using the GMAW process. The effect of forced cooling on the weld microstructure is also observed.
Regularity Of Monge-Ampere Equations In Optimal Transportation, Jiakun Liu
Regularity Of Monge-Ampere Equations In Optimal Transportation, Jiakun Liu
Faculty of Engineering and Information Sciences - Papers: Part A
We consider some recent regularity results for the Monge-Ampère equation arising in the optimal transportation problem. The Monge-Ampère equation under consideration has the following type
Twisted Cyclic Theory, Equivariant Kk-Theory And Kms States, Alan L. Carey, Sergey Neshveyev, R Nest, Adam Rennie
Twisted Cyclic Theory, Equivariant Kk-Theory And Kms States, Alan L. Carey, Sergey Neshveyev, R Nest, Adam Rennie
Faculty of Engineering and Information Sciences - Papers: Part A
Given a C-algebra A with a KMS weight for a circle action, we construct and compute a secondary invariant on the equivariant K-theory of the mapping cone of AT ,! A, both in terms of equivariant KK-theory and in terms of a semifinite spectral flow. This in particular puts the previously considered examples of Cuntz algebras [10] and SUqð2Þ [14] in a general framework. As a new example we consider the Araki-Woods IIIl representations of the Fermion algebra.
Modular Index Invariants Of Mumford Curves, Adam C. Rennie, Alan L. Carey, M Marcolli
Modular Index Invariants Of Mumford Curves, Adam C. Rennie, Alan L. Carey, M Marcolli
Faculty of Engineering and Information Sciences - Papers: Part A
We continue an investigation initiated by Consani–Marcolli of the relation between the algebraic geometry of p-adic Mumford curves and the noncommutative geometry of graph C∗-algebras associated to the action of the uniformizing p-adic Schottky group on the Bruhat–Tits tree. We reconstruct invariants of Mumford curves related to valuations of generators of the associated Schottky group, by developing a graphical theory for KMS weights on the associated graph C∗-algebra, and using modular index theory for KMS weights. We give explicit examples of the construction of graph weights for low genus Mumford curves. We then show that the theta functions of Mumford …
Spectral Triples: Examples And Index Theory, Alan L. Carey, John Phillips, Adam C. Rennie
Spectral Triples: Examples And Index Theory, Alan L. Carey, John Phillips, Adam C. Rennie
Faculty of Engineering and Information Sciences - Papers: Part A
The main objective of these notes is to give some intuition about spectral triples and the role they play in index theory. The notes are basically a road map, with much detail omitted. To give a complete account of all the topics covered would require at least a book, so we have opted for a sketch.
Families Of Type Iii Kms States On A Class Of C-Algebras Containing On And Qn, A L. Carey, J Phillips, I F. Putnam, A Rennie
Families Of Type Iii Kms States On A Class Of C-Algebras Containing On And Qn, A L. Carey, J Phillips, I F. Putnam, A Rennie
Faculty of Engineering and Information Sciences - Papers: Part A
We construct a family of purely infinite C¤-algebras, Q¸ for ¸ 2 (0, 1) that are classified by their K-groups. There is an action of the circle T with a unique KMS state à on each Q¸. For ¸ = 1/n, Q1/n »= On, with its usual T action and KMS state. For ¸ = p/q, rational in lowest terms, Q¸ »= On (n = q − p + 1) with UHF fixed point algebra of type (pq)1. For any n > 1, Q¸ »= On for infinitely many ¸ with distinct KMS states and UHF fixed-point algebras. For any ¸ …
An Opportunistic Scheduler For Dense Wlans, Kwan-Wu Chin
An Opportunistic Scheduler For Dense Wlans, Kwan-Wu Chin
Faculty of Engineering and Information Sciences - Papers: Part A
The demand for bandwidth by multimedia applications remains unabated. This is particular critical given the growing number of devices with WiFi capability, and the ubiquity of Wireless Local Area Networks (WLANs). These trends have spurred researchers to develop low-cost and backward compatible solutions to increase the capacity of WLANs. One approach is to deploy additional Access Points (APs), and strategies to manage channel, user, and transmit power. As a result, stations are likely to be near one or more APs, and therefore are more likely to experience high data rates. In this paper, we take advantage of this fact to …
Development Of A Lifetime Model For Vrla Batteries Used In Wind Turbine Generators, Xiaolin Wang, Stephen Choi, Tieling Zhang, K J. Tseng
Development Of A Lifetime Model For Vrla Batteries Used In Wind Turbine Generators, Xiaolin Wang, Stephen Choi, Tieling Zhang, K J. Tseng
Faculty of Engineering and Information Sciences - Papers: Part A
An approach to predict the remaining lifetime of lead-acid battery is described. The battery is used to provide back-up power to keep essential devices within wind turbine generators operational under emergency conditions. The approach is developed from a circuit model of the battery. From the results of laboratory tests, changes in the model parametric values due to ambient temperature variations, battery aging effects as well as discharge current level have been quantified. Through a developed computational method, the terminal voltage and state of charge of the battery at any other discharging conditions can then be calculated. The discharge profile allows …
Location Based Services With Personal Area Network For Community And Tourism Applications, Montserrat Ros, Matthew D'Souza, Adam Postula, I Maccoll
Location Based Services With Personal Area Network For Community And Tourism Applications, Montserrat Ros, Matthew D'Souza, Adam Postula, I Maccoll
Faculty of Engineering and Information Sciences - Papers: Part A
The Infopoint Explorer is an outdoor wireless personal area network for location-based services that allows users to access locality information interactively using mobile computing devices such as PDAs and smartphones. The Infopoint explorer was used to study the limitations imposed by inexpensive and popular wireless technologies such as Bluetooth for outdoor location-based services. The Infopoint Explorer functioned as a multimedia guidebook that allowed access to location-specific information using wireless Infopoints. The Infopoints detect and attempt to transfer multimedia content to nearby mobile computing devices using Bluetooth connectivity. An adaptive Bluetooth Inquiry Access Code algorithm was developed to reduce the time …
A Reduced Reference Image Quality Metric Based On Feature Fusion And Neural Networks, Aladine Chetouani, Azeddine Beghdadi, Mohamed Deriche, Abdesselam Bouzerdoum
A Reduced Reference Image Quality Metric Based On Feature Fusion And Neural Networks, Aladine Chetouani, Azeddine Beghdadi, Mohamed Deriche, Abdesselam Bouzerdoum
Faculty of Engineering and Information Sciences - Papers: Part A
A Global Reduced Reference Image Quality Metric (IQM) based on feature fusion using neural networks is proposed. The main idea is the introduction of a Reduced Reference degradation-dependent IQM (RRIQM/D) across a set of common distortions. The first stage consists of extracting a set of features from the wavelet-based edge map. Such features are then used to identify the type of degradation using Linear Discriminant Analysis (LDA). The second stage consists of fusing the extracted features into a single measure using Artificial Neural Networks (ANN). The result is a degradation- dependent IQM measure called the RRIQM/D. The performance of the …
Purely Infinite Simple C*-Algebras Associated To Integer Dilation Matrices, Ruy Exel, Astrid An Huef, Iain Raeburn
Purely Infinite Simple C*-Algebras Associated To Integer Dilation Matrices, Ruy Exel, Astrid An Huef, Iain Raeburn
Faculty of Engineering and Information Sciences - Papers: Part A
Given an n×n integer matrix A whose eigenvalues are strictly greater than 1 in absolute value, let σA be the transformation of the n-torus Tn = Rn/Zn defined by σA(e2πix) = e2πiAx for x ∈ Rn. We study the associated crossed-product C∗-algebra, which is defined using a certain transfer operator for σA, proving it to be simple and purely infinite and computing its K-theory groups.
Use Centric Hci Requirements Elicitation, Robert B. K Brown
Use Centric Hci Requirements Elicitation, Robert B. K Brown
Faculty of Engineering and Information Sciences - Papers: Part A
Among persistent issues in HCI are its separation from the other disciplines involved in the construction of Information Systems, any coherently extensive methodology and straight forward techniques for clustering interface elements for best effect. An approach to HCI which encompasses the full context of use (rather than just of usage) and entails more traditional SA&D within a single framework could be of some value. This paper introduces the HCI values of the Activity Theoretic System Architecture (ATSA) Method. © 2011 Robert B.K. Brown.
The Beginning Of A New Era In Design: Calibrated Discrete Element Modelling, Andrew Grima, David Hastie, David Curry, Peter Wypych, Richard La Roche
The Beginning Of A New Era In Design: Calibrated Discrete Element Modelling, Andrew Grima, David Hastie, David Curry, Peter Wypych, Richard La Roche
Faculty of Engineering and Information Sciences - Papers: Part A
The reliable storage and flow of bulk materials requires a comprehensive design process and good understanding of the flow properties of a bulk material. Analytical and empirical design techniques form the backbone of many design processes as they have been validated by research, however, theories based on continuum mechanics have many shortcomings and are restricted to 2-D analysis. Discrete element modelling (DEM) is proving to be a popular analysis and simulation method to verify designs for a wide range of bulk material processing and handling operations, such as transfer chutes. With the advances in computing and DEM technology, DEM has …
What Users Do: Sa&D With The Atsa Method, Robert B. K Brown, Ian C. Piper
What Users Do: Sa&D With The Atsa Method, Robert B. K Brown, Ian C. Piper
Faculty of Engineering and Information Sciences - Papers: Part A
Incomplete or inefficient elicitation, comprehension and transmission of client requirements are all sources of information system (IS) failure rates. Requirements may be missed, misunderstood or miscommunicated for the lack of a single, consistent, informing theory. Structured requirements elicitations techniques impose time delays. Cursory techniques can fail to reach any mutual understanding with the stakeholder. Formal methods can fail to cope with non-functional requirements and coder-oriented methods can put the cart before the horse, delivering something other than required. Agile methods can deliver hasty product, cobbled to meet first-cut requirements, perhaps justified by a notion that users cannot reach stable conclusions.
Advanced Semiconductor Dosimetry In Radiation Therapy, Anatoly B. Rosenfeld
Advanced Semiconductor Dosimetry In Radiation Therapy, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
Modern radiation therapy is very conformal, resulting in a complexity of delivery that leads to many small radiation fields with steep dose gradients, increasing error probability. Quality assurance in delivery of such radiation fields is paramount and requires real time and high spatial resolution dosimetry. Semiconductor radiation detectors due to their small size, ability to operate in passive and active modes and easy real time multichannel readout satisfy many aspects of in vivo and in a phantom quality assurance in modern radiation therapy. Update on the recent developments and improvements in semiconductor radiation detectors and their application for quality assurance …
Discrete Element Modelling: Trouble-Shooting And Optimisation Tool For Chute Design, Andrew P. Grima, Thomas Fraser, David B. Hastie, Peter W. Wypych
Discrete Element Modelling: Trouble-Shooting And Optimisation Tool For Chute Design, Andrew P. Grima, Thomas Fraser, David B. Hastie, Peter W. Wypych
Faculty of Engineering and Information Sciences - Papers: Part A
Conveyor transfer stations play a key role in many industries that handle bulk materials. Transfer stations can be rather sensitive to changes in material properties and can lead to relentless problems regarding reliability, wear, bottlenecking and blockages. Wet and sticky ores are typically difficult to handle materials due to their obnoxious ability to form a cohesive arch, adhere to surfaces and poor flow ability. Mines that are situated in areas with seasonal high rainfalls or that have started to exploit newer and more difficult to mine and handle ores, often from below the water table, experience vast difficulty in reliably …
Hardness And Microstructural Gradients In The Heat Affected Zone Of Welded Low-Carbon Quenched And Tempered Steels, W Pang, N Ahmed, D Dunne
Hardness And Microstructural Gradients In The Heat Affected Zone Of Welded Low-Carbon Quenched And Tempered Steels, W Pang, N Ahmed, D Dunne
Faculty of Engineering and Information Sciences - Papers: Part A
This paper concentrates on the form of the hardness gradient in the heat affected zones (HAZs) produced by submerged arc welding of two low-carbon Q & T steels. The results show unequivocally that the gradient differs from that found in steels of lower carbon equivalent in that the peak HAZ hardness is displaced from the grain coarsened heat affected zone (GCHAZ) into the grain refined heat affected zone (GRHAZ). Weld thermal cycle simulation has been used to confirm the results obtained from actual welds and to clarify the cause of this unexpected phenomenon.
An Analytical Simulation Technique For Cone-Beam Ct And Pinhole Spect, Xuezhu Zhang, Yujin Qi
An Analytical Simulation Technique For Cone-Beam Ct And Pinhole Spect, Xuezhu Zhang, Yujin Qi
Faculty of Engineering and Information Sciences - Papers: Part A
This study was aimed at developing an eficient simulation technique with an ordinary PC．The work involved derivation of mathematical operators，analytic phantom generations，and effective analytical projectors developing for cone—beam CT and pinhole SPECT imaging．The computer simulations based on the analytical projectors were developed by ray—tracing method for cone—beam CT and voxel—driven method for pinhole SPECT of degrading blurring．The 3D Shepp Logan，Jaszczak and Defrise phantoms were used for simulation evaluations and image reconstructions．The reconstructed phantom images were of good accuracy with the phantoms．The results showed that the analytical simulation technique is an efi cient tool for studying cone—beam CT and pinhole SPECT …
Development Of Fully 3d Image Reconstruction Techniques For Pinhole Spect Imaging, Xuezhu Zhang, Yujin Qi
Development Of Fully 3d Image Reconstruction Techniques For Pinhole Spect Imaging, Xuezhu Zhang, Yujin Qi
Faculty of Engineering and Information Sciences - Papers: Part A
The purpose of this study was to develop fully 3D image reconstruction techniques for pinhole SPECT imaging with our Micro-SPECT system. Our studies involve in the derivation of projection operators, analysis of the sampling characteristics of pinhole SPECT imaging in Radon space, development of effective geometric calibration method for system misalignment, and 3D image reconstruction development and implementation with quantitative degrading compensation for pinhole SPECT with both circular and helical scan. The performances of pinhole SPECT imaging were evaluated using computer simulations and experiments with the Ultra-Micro Hot-Spot phantom, Ultra-Micro Defrise phantom and small-animal imaging. The results from the computer …
Responsiveness Of High Screenings And Commercial Cereal Grains To A Blend Of Xylanase And Phytase Enzyme Products, R J. Hughes, M S. Geier, J L. Black, A M. Tredrea, S Diffey, S G. Nielsen
Responsiveness Of High Screenings And Commercial Cereal Grains To A Blend Of Xylanase And Phytase Enzyme Products, R J. Hughes, M S. Geier, J L. Black, A M. Tredrea, S Diffey, S G. Nielsen
Faculty of Engineering and Information Sciences - Papers: Part A
Two experiments evaluated the apparent metabolisable energy (AME) values for cereal grains fed with and without a blend of xylanase and phytase enzyme products to broiler chickens. The first experiment involved 30 high screenings grains (10 wheats, 11 barleys, 3 triticales, and 6 sorghums). The second experiment involved 50 grains (20 wheats, 13 barleys, 3 triticales and 14 sorghums) donated by commercial companies throughout Australia. Each experiment included "connectivity" grains used in previous experiments that contributed to the AusScan near infrared reflectance (NIR) calibration database. The inclusion of "connectivity" grains (15 in Experiment 1 and 17 in Experiment 2) enabled …
Precoded Turbo Code Within 0.1db Of Shannon Limit, S Tong, H Zheng, B Bai
Precoded Turbo Code Within 0.1db Of Shannon Limit, S Tong, H Zheng, B Bai
Faculty of Engineering and Information Sciences - Papers: Part A
The application of the precoding technique to turbo codes is investigated, resulting in a new class of turbo-like codes named precoded turbo codes. The introduction of a precoder provides a degree of freedom for code optimisation. As a result, an optimised rate-1/2 precoded turbo code with a threshold of 0.28 dB is designed using the EXIT chart.
Introduction - A Review Of Membrane Reactors, Fausto Gallucci, Angelo Basile, Faisal Ibney Hai
Introduction - A Review Of Membrane Reactors, Fausto Gallucci, Angelo Basile, Faisal Ibney Hai
Faculty of Engineering and Information Sciences - Papers: Part A
In the last decades, membrane catalysis has been studied by several research and the significant progress in this field is summarized in several review articles (Armor 1998, Lin 2001, Lu 2007, Mcleary 2006, Sanchez 2002, Saracco 1994, Shu 1991). Considering a IUPAC definition (Koros 1996), a membrane reactor (MR) is a device for simultaneously performing a reaction (steam reforming, dry reforming, autothermal reforming, etc.) and a membrane-based separation in the same physical device. Therefore, the membrane not only plays the role of a separator, but also takes place in the reaction itself. The term Membrane Bioreactor (MBR), on the other …
Post-Weld Atmospheric Contamination Of Gas Tungsten Arc Deposited Welds In Commercially Pure And Ti-6al-4v Titanium Alloys, Nicholas Hoye, Huijun Li, John Norrish, Rian Dippenaar
Post-Weld Atmospheric Contamination Of Gas Tungsten Arc Deposited Welds In Commercially Pure And Ti-6al-4v Titanium Alloys, Nicholas Hoye, Huijun Li, John Norrish, Rian Dippenaar
Faculty of Engineering and Information Sciences - Papers: Part A
Titanium alloys are known to exhibit unique weldability issues, particularly atmospheric contamination from interstitial species such as oxygen. The prevention of such impurities from entering the weld region and surrounding heat affected zones is critical for engineering applications as these species are seen to dramatically alter the microstructure and so mechanical properties of the material. Of greatest concern is embrittlement of the weld region. During this study, the influence of inert shielding gas on atmospheric contamination by interstitial species, namely hydrogen, carbon, nitrogen and oxygen, was investigated as a function of post-weld gas shielding temperature. Gas tungsten arc welding (GTAW) …
Research To Establish A Systematic Approach To Safe Welding Procedure Development Using Austenitic Filler Material For Fabrication Of High Strength Steel, Lenka Kuzmikova, John Norrish, Huijun Li, Mark Callaghan
Research To Establish A Systematic Approach To Safe Welding Procedure Development Using Austenitic Filler Material For Fabrication Of High Strength Steel, Lenka Kuzmikova, John Norrish, Huijun Li, Mark Callaghan
Faculty of Engineering and Information Sciences - Papers: Part A
High strength, thermo-mechanically treated steels often require very careful control of welding procedures to ensure freedom from hydrogen assisted cold cracking (HACC) in the weld metal and heat affected zone (HAZ) whilst avoiding undue loss of heat affected zone strength. In practice this leads to restricted operating envelopes and the requirement for rigorous procedure management. An alternative approach is the use of austenitic welding consumables but whilst this may be expected to expand the process parameter envelope its use is often restricted by adherence to procedures previously developed for ferritic consumables. The current paper describes the research undertaken to establish …
Providing And Financing Aged Care In Australia, Henry Ergas, Francesco Paolucci
Providing And Financing Aged Care In Australia, Henry Ergas, Francesco Paolucci
Faculty of Engineering and Information Sciences - Papers: Part A
This article focuses on the provision and financing of aged care in Australia. Demand for aged care will increase substantially as a result of population aging, with the number of Australians aged 85 and over projected to increase from 400,000 in 2010 to over 1.8 million in 2051. Meeting this demand will greatly strain the current system, and makes it important to exploit opportunities for increased efficiency. A move to greater beneficiary co-payments is also likely, though its extent may depend on whether aged care insurance and other forms of pre-payment can develop.