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Articles 211 - 236 of 236
Full-Text Articles in Social and Behavioral Sciences
Predication Of The Behaviour Of Bulk Materials In The Design And Operation Of Bulk Handling And Processing Plants, David Hastie, Peter Wypych, Andrew Grima, Richard La Roche, David Curry
Predication Of The Behaviour Of Bulk Materials In The Design And Operation Of Bulk Handling And Processing Plants, David Hastie, Peter Wypych, Andrew Grima, Richard La Roche, David Curry
Faculty of Engineering and Information Sciences - Papers: Part A
It is very dangerous to assume or extrapolate anything when it comes to bulk material properties and behaviour. Traditional methods for flow prediction, such as hand calculation or even just relying on past experience, require assumptions to be made about the bulk material properties and flow. Although these materials may have generic names and possess similar properties (e.g. coal, iron ore), they can all behave quite differently under dynamic conditions. What we end up designing for one part of the plant may be quite different to what is needed in another part of the plant, which may be handling or …
Distributed Energy Storage For Mitigation Of Voltage-Rise Impact Caused By Rooftop Solar Pv, M J. E Alam, K M. Muttaqi, Darmawan Sutanto
Distributed Energy Storage For Mitigation Of Voltage-Rise Impact Caused By Rooftop Solar Pv, M J. E Alam, K M. Muttaqi, Darmawan Sutanto
Faculty of Engineering and Information Sciences - Papers: Part A
A high penetration of solar photovoltaic (PV) resources into distribution networks may create voltage rise problem when the generation from PV resources substantially exceeds the load demand. To reduce the voltage rise, the excess amount of power from the solar PV units needs to be reduced. In this paper, distributed storage systems are proposed for the mitigation of voltage rise problem. The surplus energy from the solar PV is used to charge the distributed storage units during midday, when the power from the solar PV would be typically higher than the load level. This stored energy is then used to …
Correlating Uncompensated Antiferromagnetic Moments And Exchange Coupling Interactions In Interface Ion-Beam Bombarded Co90fe 10/Cofe-Oxide Bilayers, Chin Shueh, Pei-Shi Chen, David Cortie, Frank Klose, Wen-Chen Chen, T H. Wu, Johan Van Lierop, Ko-Wei Lin
Correlating Uncompensated Antiferromagnetic Moments And Exchange Coupling Interactions In Interface Ion-Beam Bombarded Co90fe 10/Cofe-Oxide Bilayers, Chin Shueh, Pei-Shi Chen, David Cortie, Frank Klose, Wen-Chen Chen, T H. Wu, Johan Van Lierop, Ko-Wei Lin
Faculty of Engineering and Information Sciences - Papers: Part A
The coercivity and exchange bias field of ferro-/antiferromagnetic Co 90Fe10/CoFe-oxide bilayers were studied as function of the surface morphology of the bottom CoFe-oxide layer. The CoFe-oxide surface structure was varied systematically by low energy (0-70 V) Argon ion-beam bombardment before subsequent deposition of the Co90Fe10 layer. Transmission electron microscopy results showed that the bilayer consisted of hcp Co90Fe10 and rock-salt CoFe-oxide. At low temperatures, enhanced coercivities and exchange bias fields with increasing ion-beam bombardment energy were observed, which are attributed to defects and uncompensated moments created near the CoFe-oxide surface in increasing amounts with larger ion-beam bombardment energies. Magnetometry results …
Flicker Propagation Analysis In Distribution Networks With Embedded Generation, D Perera, L Meegahapola, S Perera, P Ciufo
Flicker Propagation Analysis In Distribution Networks With Embedded Generation, D Perera, L Meegahapola, S Perera, P Ciufo
Faculty of Engineering and Information Sciences - Papers: Part A
Embedded generators such as wind generators can produce observable voltage fluctuations during variable wind conditions hence flicker. The flicker produced by such intermittent and fluctuating generating sources can propagate to other parts of the distribution network while creating power quality issues in distribution feeders. This study presents a flicker emission analysis for a doubly-fed induction generator (DFIG) based wind farm and investigate the pertinent factors which influence flicker propagation and attenuation in distribution feeders. Study has shown that voltage fluctuations are significantly influenced by the attenuation characteristics of various load types (i.e. constant power, impedance and current loads) connected to …
Evaluating Disaster Management Knowledge Model By Using A Frequency-Based Selection Technique, Siti Hajar Othman, Ghassan Beydoun
Evaluating Disaster Management Knowledge Model By Using A Frequency-Based Selection Technique, Siti Hajar Othman, Ghassan Beydoun
Faculty of Engineering and Information Sciences - Papers: Part A
Disaster Management (DM) is a multidisciplinary endeavour and a very difficult knowledge domain to model. It is a diffused area of knowledge that is continuously evolving and informally represented. Metamodel is the output artefact of metamodelling, a software engineering approach, which makes statements about what can be expressed in the valid models of the knowledge domain. It is an appropriate high level knowledge structure to facilitate it being communicated among DM stakeholders. A Disaster Management Metamodel (DMM) is developed. To satisfy the expressiveness and the correctness of a DMM, in this paper we present a metamodel evaluation technique by using …
A Synthesis Of A Knowledge Management Framework For Sports Event Management, Azizul Rahman Abdul Ghaffar, Ghassan Beydoun, Jun Shen, Will Tibben, Dongming Xu
A Synthesis Of A Knowledge Management Framework For Sports Event Management, Azizul Rahman Abdul Ghaffar, Ghassan Beydoun, Jun Shen, Will Tibben, Dongming Xu
Faculty of Engineering and Information Sciences - Papers: Part A
Due to rapid social development in Asia, sports events have grown larger and many new countries are also hosting them for their first time. In addition to required increase in expenditures and more efficient management, various instances of inadequate planning highlighted the needs for more effective and better sustainable structures to support knowledge transfer between organizers, from one event to the next. The research presented in this paper aims to facilitate the deployment of systematic knowledge management practices to sports event management, to enable sustainable planning. The research in this paper synthesizes is carried out on the Malaysian Games as …
Wearable Sensors In Intelligent Clothing For Measuring Human Body Temperature Based On Optical Fiber Bragg Grating, Hongqiang Li, Haijiang Yang, Enbang Li, Zhihui Liu, Kejia Wei
Wearable Sensors In Intelligent Clothing For Measuring Human Body Temperature Based On Optical Fiber Bragg Grating, Hongqiang Li, Haijiang Yang, Enbang Li, Zhihui Liu, Kejia Wei
Faculty of Engineering and Information Sciences - Papers: Part A
Measuring body temperature is considerably important to physiological studies as well as clinical investigations. In recent years, numerous observations have been reported and various methods of measurement have been employed. The present paper introduces a novel wearable sensor in intelligent clothing for human body temperature measurement. The objective is the integration of optical fiber Bragg grating (FBG)-based sensors into functional textiles to extend the capabilities of wearable solutions for body temperature monitoring. In addition, the temperature sensitivity is 150 pm/°C, which is almost 15 times higher than that of a bare FBG. This study combines large and small pipes during …
Reducing Unwarranted Variation In Healthcare Service Delivery Systems: Key Issues, Research Challenges And Potential Solutions, Nagesh Shukla, Senevi Kiridena, Nishikant Mishra
Reducing Unwarranted Variation In Healthcare Service Delivery Systems: Key Issues, Research Challenges And Potential Solutions, Nagesh Shukla, Senevi Kiridena, Nishikant Mishra
Faculty of Engineering and Information Sciences - Papers: Part A
There is a growing need worldwide to increase the quality and productivity of healthcare services delivery. To this end, analysing and reducing unwarranted variations in healthcare has attracted much attention in recent times. However, current modelling and simulation approaches to reduce unwarranted variations suffer from numerous limitations. Consequently, service improvement efforts have often failed to deliver expected results. This paper discusses the key issues associated with reducing unwarranted variations in hospital service delivery systems, and proposes a research framework that aims at overcoming these issues. In doing so, it highlights the need for: accurately and efficiently modelling complex service delivery …
Evolution Of Internal Crack In Bcc Fe Under Compressive Loading, Dongbin Wei, Zhengyi Jiang, Jingtao Han
Evolution Of Internal Crack In Bcc Fe Under Compressive Loading, Dongbin Wei, Zhengyi Jiang, Jingtao Han
Faculty of Engineering and Information Sciences - Papers: Part A
A molecular dynamics model has been developed to investigate the evolution of the internal crack of nano scale during heating or compressive loading in BCC Fe. The initial configuration does not contain any pre-existing dislocations. In the case of heating, temperature shows a significant effect on crack evolution and the critical temperature at which the crack healing becomes possible is 673 K. In the case of compressive loading, the crack can be healed at 40 K at a load- ing rate 0.025 × 1018 Pa·m1/2/s in 6 × 10−12 s. The diffusion of Fe atoms into the crack area results …
A Methodology For Bridge Condition Evaluation, Maria Rashidi, Peter Gibson
A Methodology For Bridge Condition Evaluation, Maria Rashidi, Peter Gibson
Faculty of Engineering and Information Sciences - Papers: Part A
Due to the substantial role of bridges in transportation networks and in accordance with the limited funding for bridge management, remediation strategies have to be prioritised. A conservative bridge assessment will result in unnecessary actions, such as costly bridge strengthening or repairs. On the other hand, any bridge maintenance negligence and delayed actions may lead to heavy future costs or degraded assets. The accuracy of decisions developed by any manager or bridge engineer relies on the accuracy of the bridge condition assessment which emanates from visual inspection. Many bridge rating systems are based on a very subjective procedure and are …
In Silico Nanodosimetry: New Insights Into Nontargeted Biological Responses To Radiation, Zdenka Kuncic, Hilary L. Byrne, Aimee L. Mcnamara, Susanna Guatelli, Westa Domanova, Sebastian Incerti
In Silico Nanodosimetry: New Insights Into Nontargeted Biological Responses To Radiation, Zdenka Kuncic, Hilary L. Byrne, Aimee L. Mcnamara, Susanna Guatelli, Westa Domanova, Sebastian Incerti
Faculty of Engineering and Information Sciences - Papers: Part A
The long-held view that radiation-induced biological damage must be initiated in the cell nucleus, either on or near DNA itself, is being confronted by mounting evidence to suggest otherwise. While the efficacy of cell death may be determined by radiation damage to nuclear DNA, a plethora of less deterministic biological responses has been observed when DNA is not targeted. These so-called nontargeted responses cannot be understood in the framework of DNA-centric radiobiological models; what is needed are new physically motivated models that address the damage-sensing signalling pathways triggered by the production of reactive free radicals. To this end, we have …
Microdosimetry For Targeted Alpha Therapy Of Cancer, Chen-Yu Huang, Susanna Guatelli, Brad Oborn, Barry J. Allen
Microdosimetry For Targeted Alpha Therapy Of Cancer, Chen-Yu Huang, Susanna Guatelli, Brad Oborn, Barry J. Allen
Faculty of Engineering and Information Sciences - Papers: Part A
Targeted alpha therapy (TAT) has the advantage of delivering therapeutic doses to individual cancer cells while reducing the dose to normal tissues. TAT applications relate to hematologic malignancies and now extend to solid tumors. Results from several clinical trials have shown efficacy with limited toxicity. However, the dosimetry for the labeled alpha particle is challenging because of the heterogeneous antigen expression among cancer cells and the nature of short-range, high-LET alpha radiation. This paper demonstrates that it is inappropriate to investigate the therapeutic efficacy of TAT bymacrodosimetry. The objective of this work is to review the microdosimetry of TAT as …
Hybrid Power Saving Technique For Wireless Sensor Networks, Asama Alshaibi, Peter Vial, Montserrat Ros
Hybrid Power Saving Technique For Wireless Sensor Networks, Asama Alshaibi, Peter Vial, Montserrat Ros
Faculty of Engineering and Information Sciences - Papers: Part A
In wireless communication, idle listening, receiving and transmitting are the main source of consumption of energy. This paper gives an overview of several techniques used for wireless networks. We incorporated PSM and PC to gain the advantage of PSM (reduce idle listening) and PC (reduce receiving and transmitting power) and implemented them in the IEEE 802.15.4 protocol. The results show that the new hybrid technique saves more power than PSM and PC individually. © 2012 IEEE.
Order-4 Quasi-Orthogonal Cooperative Communication In Stfc Mb-Ofdm Uwb, Zixuan Lin, Le Chung Tran, Farzad Safaei, Tadeusz A. Wysocki
Order-4 Quasi-Orthogonal Cooperative Communication In Stfc Mb-Ofdm Uwb, Zixuan Lin, Le Chung Tran, Farzad Safaei, Tadeusz A. Wysocki
Faculty of Engineering and Information Sciences - Papers: Part A
Recently, cooperative communication and Space-Time-Frequency-Codes (STFCs) have been introduced into the Multiband OFDM Ultra-Wideband (MB-OFDM UWB) to improve the reliability, data rate and system capacity. This paper proposes a cooperative communication scheme for a four source node MB-OFDM UWB system using Quasi-Orthogonal STFCs, which is referred to as order-4 Quasi-Orthogonal Cooperative Communication Scheme (4-QOCCS). Simulation results show that the proposed 4-QOCCS provides significantly better error performance over the conventional MB-OFDM UWB and our order-2 Orthogonal Cooperative Communication Scheme (2-OCCS) using the Alamouti STFCs, and even better than the order-4 Orthogonal Cooperative Communication Scheme (4-OCCS), which we have been recently proposed, …
Delta Extraction Optimization For View Maintenance In A Limited Collaborative Environment, Zheng Lu, Haijun Liu, Peter Hyland
Delta Extraction Optimization For View Maintenance In A Limited Collaborative Environment, Zheng Lu, Haijun Liu, Peter Hyland
Faculty of Engineering and Information Sciences - Papers: Part A
This work considers maintaining materialized view in a distributed environment where the collaboration from highly autonomous operational database management systems is limited to granting read only access on a set of selected relational tables. In addition, due to possibly large volumes of remote source data involved in the view maintenance process, and consequently enormous overhead associated with data transfer, efficiency issues must been taken into the consideration. This proposal is based on the observation that usually, there is a large amount of static data in relational tables. It is proposed to use some statistical techniques at data warehouse system to …
Experimental Investigation Of Cable Catcher Systems For Office Building Blast Protection, Alexander Remennikov, L S. Brodie
Experimental Investigation Of Cable Catcher Systems For Office Building Blast Protection, Alexander Remennikov, L S. Brodie
Faculty of Engineering and Information Sciences - Papers: Part A
High performance cable catcher systems are an effective means of protecting office building windows and façades from effects of explosive blast. This paper presents experimental results for the response a simple cable catcher system subject to impact loads delivered using a drop-hammer testing facility. The objectives of this experimental programme were to investigate the loaddeformation behaviour of steel strand cables and to evaluate the dynamic performance of cable catcher systems in reference to their ability to absorb blast energy. Two steel cable arrangements (compacted and normal spiral strand) have been tensile tested in order to provide load-deformation curves as well …
Purely Infinite C-Algebras Arising From Crossed Products, Mikael Rordam, Adam Sierakowski
Purely Infinite C-Algebras Arising From Crossed Products, Mikael Rordam, Adam Sierakowski
Faculty of Engineering and Information Sciences - Papers: Part A
We study conditions that will ensure that a crossed product of a C-algebra by a discrete exact group is purely infinite (simple or non-simple). We are particularly interested in the case of a discrete non-amenable exact group acting on a commutative C-algebra, where our sufficient conditions can be phrased in terms of paradoxicality of subsets of the spectrum of the abelian C-algebra. As an application of our results we show that every discrete countable non-amenable exact group admits a free amenable minimal action on the Cantor set such that the corresponding crossed product C-algebra is a Kirchberg algebra in the …
Some Constructions Of Mutually Orthogonal Latin Squares And Superimposed Codes, Jennifer Seberry, Dongvu Tonien
Some Constructions Of Mutually Orthogonal Latin Squares And Superimposed Codes, Jennifer Seberry, Dongvu Tonien
Faculty of Engineering and Information Sciences - Papers: Part A
Superimposed codes is a special combinatorial structure that has many applications in information theory, data communication and cryptography. On the other hand, mutually orthogonal latin squares is a beautiful combinatorial object that has deep connection with design theory. In this paper, we draw a connection between these two structures. We give explicit construction of mutually orthogonal latin squares and we show a method of generating new larger superimposed codes from an existing one by using mutually orthogonal latin squares. If n denotes the number of codewords in the existing code then the new code contains n2 codewords. Recursively, using this …
Development And Validation Of A Concept Inventory For Introductory-Level Climate Change Science, Lorna Jarrett, Brian Ferry, George Takacs
Development And Validation Of A Concept Inventory For Introductory-Level Climate Change Science, Lorna Jarrett, Brian Ferry, George Takacs
Faculty of Engineering and Information Sciences - Papers: Part A
This paper follows on from Jarrett, Takacs and Ferry (2011) which reported the first stage in development of a high school level concept inventory (CI) for the science of climate change: the climate change concept inventory (CCCI). In order to develop a reliable and valid instrument, it is necessary to follow appropriate procedures. This paper details the process of CI item development; reports statistical results of initial field trials and outlines how these will be used to further refine the CCCI. Item difficulty, discrimination, and point biserial coefficient were calculated for each item. Cronbach's alpha and test-retest data were used …
Multiuser Diversity With Capture In Ofdma Systems With Clustered Feedback, Hang Li, Qinghua Guo, Licai Fang, Defeng (David) Huang
Multiuser Diversity With Capture In Ofdma Systems With Clustered Feedback, Hang Li, Qinghua Guo, Licai Fang, Defeng (David) Huang
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we propose a cluster-based feedback protocol for multiuser orthogonal frequency-division multipleaccess (OFDMA) systems, where the capture effect is employed in each cluster to reduce the enormous system overhead induced by polling channel-state information. Then, we analyze the system throughput performance of the proposed feedback protocol. Compared with the full feedback scheme in the literature, numerical simulations show that the proposed protocol with clustered feedback in OFDMA systems achieves higher system throughput by employing the capture effect with limited feedback overhead, when the number of users is reasonably large. Moreover, compared with our previous protocol of Multiuser Diversity …
Fairness And Capacity Analysis Of Opportunistic Feedback Protocol With Proportional Fair Or Maximum Throughput Scheduling, Hang Li, Qinghua Guo, Licai Fang, Defeng (David) Huang
Fairness And Capacity Analysis Of Opportunistic Feedback Protocol With Proportional Fair Or Maximum Throughput Scheduling, Hang Li, Qinghua Guo, Licai Fang, Defeng (David) Huang
Faculty of Engineering and Information Sciences - Papers: Part A
An opportunistic feedback protocol with maximum throughput (MT) scheduling has been proposed in the literature to achieve multiuser diversity for the downlink transmission of a wireless system, and its system capacity has been analyzed with the assumption that the received signal-to-noise ratios (SNRs) for the users are independent and identically distributed. In this paper, fairness and capacity performances of the opportunistic feedback protocol are analyzed for SNRs with independent but not necessarily identical distributions. In addition to MT scheduling, we also analyze the fairness and capacity performances for proportional fair (PF) scheduling. Compared with MT scheduling, numerical results demonstrate that …
Chain-Die Forming, Is It A Right Forming Method To Make Structural Parts Of Motor Vehicles With Uhss Material, Shichao Ding, Yuankun Zhang
Chain-Die Forming, Is It A Right Forming Method To Make Structural Parts Of Motor Vehicles With Uhss Material, Shichao Ding, Yuankun Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
Reducing the body weight of a motor vehicle is one of the most important research approaches in car manufacturing and steel making industries in order to reduce the pollution caused by motor vehicles. In this approach, ultra-high strength steel (UHSS) is developed by steel makers and has been applied more and more to motor vehicles. The UHSS materials have the required strength, but more or less the material's ductility is sacrificed to achieve this target. High strength materials are difficult to form using conventional forming methods. Forming high strength materials to parts effectively and economically is a high priority. Chain-die …
Shifting Freight To Rail Could Make The Pacific Highway Safer, Philip G. Laird
Shifting Freight To Rail Could Make The Pacific Highway Safer, Philip G. Laird
Faculty of Engineering and Information Sciences - Papers: Part A
Articulated trucks such as semi-trailers and "B-Doubles" are involved in about 30% of fatal road accidents on the Pacific Highway. As the number of trucks carrying freight between Sydney and Brisbane increases, we will see more tragic incidents like the fatal crash involving a B-Double on 8 January 2012 near Urunga.
Assessing Students Understanding Of The Concept Of Free Body Diagrams Using Online Tests, Timothy J. Mccarthy, Thomas Goldfinch
Assessing Students Understanding Of The Concept Of Free Body Diagrams Using Online Tests, Timothy J. Mccarthy, Thomas Goldfinch
Faculty of Engineering and Information Sciences - Papers: Part A
There are many threshold concepts for students to grasp in Engineering Mechanics. Research has shown that one of the critical concepts that must be understood is the Free Body Diagram (FBD). This paper describes an approach to check students’ mastery of simple Free Body Diagrams and to address errors and misconceptions they may have. An online FBD quiz has been designed and implemented in a first year Engineering subject. Teaching material and follow-up support is targeted for students who struggle with the concept until mastery is achieved. These have been based on the theory of threshold concepts and the force …
An Inventory Of Landslides Within The Sydney Basin To Aid The Development Of A Refined Susceptibility Zoning, Phillip N. Flentje, David Stirling, Darshika Palamakumbure
An Inventory Of Landslides Within The Sydney Basin To Aid The Development Of A Refined Susceptibility Zoning, Phillip N. Flentje, David Stirling, Darshika Palamakumbure
Faculty of Engineering and Information Sciences - Papers: Part A
The University of Wollongong GIS-based Landslide Inventory is currently being expanded from its Illawarra centric coverage (664 landslides) to include the 31,000km2 geological extent of the Sydney Basin and ultimately all of New South Wales (hereafter this inventory will be referred to as the NSW LI). In 1998, this inventory stood at 319 sites of instability and in 2010 it had grown to 616 landslides. The population of the Sydney Basin in 2006 was approximately 4.9 million people, representing approximately one quarter of the population of Australia. When this current phase of expansion is completed, the NSW LI will include …
Synthetic Populations: Review Of The Different Approaches, Johan Barthelemy, Eric Cornelis
Synthetic Populations: Review Of The Different Approaches, Johan Barthelemy, Eric Cornelis
Faculty of Engineering and Information Sciences - Papers: Part A
Microsimulations may involve a large number of agents. It is then practically impossible or too expensive to obtain a fully and complete disaggregated data set about these agents of interest. Moreover, if such a dataset was available, its use would be potentially problematic in view of stringent privacy laws. To address this problem one may build an articial population starting from known aggregate data. Most of the known generation methods are explained in this paper. Their advantages and limitations are discussed and references are given for further details.