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135263 full-text articles. Page 3318 of 3801.

Taut-Slack Algorithm For Analyzing The Geometric Nonlinearity Of Cable Structures, Zhuo Wang, Timothy McCarthy, M Neaz Sheikh 2011 University of Wollongong

Taut-Slack Algorithm For Analyzing The Geometric Nonlinearity Of Cable Structures, Zhuo Wang, Timothy Mccarthy, M Neaz Sheikh

Faculty of Engineering - Papers (Archive)

This paper presents an improved small strain elastic finite element formulation to analyze static multi-component mooring cable problems. The inherent catenary profile of a cable subjected to self-weight and other loads can be solved quickly with the flexibility iteration approach coupled with the ‘Taut-slack’ algorithm. This new algorithm improves the stability of the Newton-Raphson solution process. The results for an example problem have been found to be consistent with those from OrcaFlex.


Robust High-Temperature Magnetic Pinning Induced By Proximity In Yba2cu3o7-8/La0.67sr0.33mno3 Hybrids, C.Z Chen, Z Y. Liu, Y M. Lu, L Zeng, C B. Cai, Rong Zeng, S. X. Dou 2011 Shanghai University China

Robust High-Temperature Magnetic Pinning Induced By Proximity In Yba2cu3o7-8/La0.67sr0.33mno3 Hybrids, C.Z Chen, Z Y. Liu, Y M. Lu, L Zeng, C B. Cai, Rong Zeng, S. X. Dou

Faculty of Engineering - Papers (Archive)

An elaborately designed bilayer consisting of superconducting YBa2Cu3O7-6 (YBCO) and ferromagnetic La0.67Sr0.33MnO3-6 (LSMO) was prepared on a single crystal LaAlO3 substrate by pulsed laser deposition (PLD), with a view to understanding the mechanism behind the influence of superconductor/ferromagnet proximity on the critical current density, Jc. The present bilayer system shows significant modifications in Jc, as evidenced by the suppressed decay of its temperature dependence, as well as the crossing behavior of the magnetic field dependence of Jc at high temperatures. This indicates that ...


Fabrication, Magnetic, And Ferroelectric Properties Of Multiferroic Bifeo3 Hollow Nanoparticles, Yi Du, Zhenxiang Cheng, S X. Dou, Darren J. Attard, Xiaolin Wang 2011 University of Wollongong

Fabrication, Magnetic, And Ferroelectric Properties Of Multiferroic Bifeo3 Hollow Nanoparticles, Yi Du, Zhenxiang Cheng, S X. Dou, Darren J. Attard, Xiaolin Wang

Faculty of Engineering - Papers (Archive)

Hollow BiFeO3 nanoparticles were synthesized by an electrospray route for the first time. The phase purity and structure have been investigated by x-ray diffraction and Raman spectroscopy. Transmission and scanning electron microscope investigations revealed that the as-obtained BiFeO3 hollow spheres were polycrystalline, with a shell thickness of 35 nm. The formation mechanism can be possibly explained by Ostwald ripening. Raman spectra have verified decreased vibrational frequencies in BiFeO3 nanoparticles. These hollow and core-shell multiferroic nanoparticles exhibit significantly enhanced ferromagnetism from 5 to 600 K due to a broken spiral spin structure. The ferroelectricity of hollow BiFeO3 ...


Critical Magnetic Transition In Tbni2mn-Magnetization And Mossbauer Spectroscopy, Jianli Wang, S J. Campbell, S J. Kennedy, Rong Zeng, S. X. Dou, Guangheng Wu 2011 University of Wollongong

Critical Magnetic Transition In Tbni2mn-Magnetization And Mossbauer Spectroscopy, Jianli Wang, S J. Campbell, S J. Kennedy, Rong Zeng, S. X. Dou, Guangheng Wu

Faculty of Engineering - Papers (Archive)

The structural and magnetic properties of the TbNi2Mnx series (0.9 ≤ x ≤ 1.10) have been investigated using x-ray diffraction, field- and temperature-dependent ac magnetic susceptibility,DC magnetization (5-340 K; 0-5 T) and 57Fe Mössbauer spectroscopy (5-300 K). TbNi2Mnx crystallize in the MgCu2-type structure (space group Fd-3m). The additional contributions to the magnetic energy terms from transition metal-transition metal interactions (T-T) and rare earthtransition metal interactions (R-T) in RNi2Mn contribute to their increased magnetic ordering temperatures compared with RNi2 and RMn2. Both the lattice constant a and the Curie temperature TC exhibit maximal values at the x=1 composition indicating ...


Mr Damper In Reducing Pounding Effect Of Base-Isolated Rc Highway Bridge, M Neaz Sheikh, Jingya Xiong, Weihua Li 2011 University of Wollongong

Mr Damper In Reducing Pounding Effect Of Base-Isolated Rc Highway Bridge, M Neaz Sheikh, Jingya Xiong, Weihua Li

Faculty of Engineering - Papers (Archive)

Significant structural damage due to pounding between adjacent superstructures of multispan reinforced concrete (RC) highway bridges has been observed in past earthquakes. Different methods have been proposed in the literature to mitigate the adverse pounding effect. This paper presents an analytical investigation on the use of magnetorheological (MR) dampers in reducing the pounding effect of base-isolated multi-span RC highway bridges. It has been observed that MR damper can effectively reduce adverse pounding effect. Three control strategies (passive off, passive on, and bang bang control) of MR damper have been investigated. Although all the control strategies are found to be effective ...


Organic Solar Cells: Evaluation Of The Stability Of P3ht Using Time-Delayed Degradation, Chung-How Poh, Chung-Kiak Poh, Glenn Bryant, Warwick Belcher, Paul Dastoor 2011 University of Newcastle

Organic Solar Cells: Evaluation Of The Stability Of P3ht Using Time-Delayed Degradation, Chung-How Poh, Chung-Kiak Poh, Glenn Bryant, Warwick Belcher, Paul Dastoor

Faculty of Engineering - Papers (Archive)

Despite the fact that the performance of organic solar cells is generally susceptible to degradation by moisture exposure, there has been suggestion that the photoactive layer (P3HT) is surprisingly resilient. This work attempts to confirm the stability of P3HT as an organic solar cell material by deliberately introducing water into the photoactive layer. A dramatic step drop in device performance during cell characterization is observed approximately one day after the device has been fabricated. The time-delayed step drop in output efficiency strongly suggests that moisture has little effect on the P3HT conducting polymer.


The Effects Of Size And Orientation On Magnetic Properties And Exchange Bias In Co3o4 Mesoporous Nanowires, Rong Zeng, J Q Wang, Zhixin Chen, Wenxian Li, S. X. Dou 2011 University of Wollongong

The Effects Of Size And Orientation On Magnetic Properties And Exchange Bias In Co3o4 Mesoporous Nanowires, Rong Zeng, J Q Wang, Zhixin Chen, Wenxian Li, S. X. Dou

Faculty of Engineering - Papers (Archive)

Co3O4 mesoporous nanowires with average single crystalline grain sizes of about 8 nm, 12nm, 25 nm, and 45 nm were synthesized by sintering of microwave-assisted hydrothermal processed belt-Co(OH)2 precursors at 300–500 °C for 2 h. Microstructure analysis was conducted by x-ray diffraction, x-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), field emission SEM (FESEM), transmission electron microscopy (TEM), and high resolution TEM (HRTEM) to confirm the composition, structure, and orientation in the nanowires. Systematic magnetic measurements have also been conducted on the nanowires. It was found that the size and orientation have significant ...


Tio2(B)@Carbon Composite Nanowires As Anode For Lithium Ion Batteries With Enhanced Reversible Capacity And Cyclic Performance, Zunxian Yang, Guodong Du, Zaiping Guo, Xuebin Yu, Zhixin Chen, Tailiang Guo, Hua-Kun Liu 2011 Fuzhou University China

Tio2(B)@Carbon Composite Nanowires As Anode For Lithium Ion Batteries With Enhanced Reversible Capacity And Cyclic Performance, Zunxian Yang, Guodong Du, Zaiping Guo, Xuebin Yu, Zhixin Chen, Tailiang Guo, Hua-Kun Liu

Faculty of Engineering - Papers (Archive)

Novel TiO2(B)@carbon composite nanowires were simply prepared by a two-step hydrothermal process with subsequent heat treatment in argon. The nanostructures exhibit the unique feature of having TiO2(B) encapsulated inside and an amorphous carbon layer coating the outside. The unique core/shell structure and chemical composition is likely to lead to perfect performance in many applications. In this paper, the results of Li-ion battery testing are presented to demonstrate the superior cyclic performance and rate capability of the TiO2(B)@carbon nanowires. The composite nanowires exhibit a high reversible capacity of 560 mAh g−1 ...


Flow Of Slag Through Coke Channels At 1500c, Hazem F. Labib, Brian J. Monaghan, Raymond L. Longbottom, Sheng J. Chew, Peter R. Austin 2011 University of Wollongong

Flow Of Slag Through Coke Channels At 1500c, Hazem F. Labib, Brian J. Monaghan, Raymond L. Longbottom, Sheng J. Chew, Peter R. Austin

Faculty of Engineering - Papers (Archive)

The ironmaking blast furnace forms part of the dominant process route for steelmaking worldwide. In the lower zone of this shaft reactor, liquid iron and slag descend countercurrent to reducing gases through a packed bed of coke. The fundamental characteristics of these liquid flows are not fully understood, but influence the product quality, production rate, fuel use and asset life of the process, and hence the greenhouse gas emissions and competitiveness of the integrated steel industry. The present study aimed to establish the criteria for the passage of slag through the narrow pore necks that form between coke particles. To ...


Introduction To The Geant4 Simulation Toolkit, Susanna Guatelli, D Cutajar, Bradley Oborn, Anatoly B. Rosenfeld 2011 University of Wollongong

Introduction To The Geant4 Simulation Toolkit, Susanna Guatelli, D Cutajar, Bradley Oborn, Anatoly B. Rosenfeld

Faculty of Engineering - Papers (Archive)

Geant4 is a Monte Carlo simulation Toolkit, describing the interactions of particles with matter. Geant4 is widely used in radiation physics research, from High Energy Physics, to medical physics and space science, thanks to its sophisticated physics component, coupled with advanced functionality in geometry description. Geant4 is widely used at the Centre for Medical Radiation Physics (CMRP), at the University of Wollongong, to characterise and optimise novel detector concepts, radiotherapy treatments, and imaging solutions. This lecture consists of an introduction to Monte Carlo method, and to Geant4. Particular attention will be devoted to the Geant4 physics component, and to the ...


Influence Of Coke Ash On Blast Furnace Hearth Behaviour, M W. Chapman, Robert J. Nightingale, B J. Monaghan 2011 University of Wollongong

Influence Of Coke Ash On Blast Furnace Hearth Behaviour, M W. Chapman, Robert J. Nightingale, B J. Monaghan

Faculty of Engineering - Papers (Archive)

Abstract Liquid iron in the ironmaking blast furnace picks up more than half of its carbon while percolating through the packed coke bed in the deadman and hearth of the blast furnace thus the conditions within the hearth have a direct impact on liquid drainage and hot metal quality. Consequently, the rate of carbon dissolution into liquid iron, and the factors contributing to the movement of liquids through the coke bed must be understood. Investigations using quenched coke dissolution techniques have demonstrated that a mineral layer was formed between the liquid iron and the coke matrix as coke dissolves into ...


Coupling Effects Of Feed Solution Ph And Ionic Strength On The Rejection Of Boron By Nf/Ro Membranes, Kha Tu, Long Nghiem, Allan Chivas 2011 University of Wollongong

Coupling Effects Of Feed Solution Ph And Ionic Strength On The Rejection Of Boron By Nf/Ro Membranes, Kha Tu, Long Nghiem, Allan Chivas

Faculty of Engineering - Papers (Archive)

The coupling effects of solution pH and ionic strength on boron rejection by nanofiltration (NF) and reverse osmosis (RO) membranes were investigated. Two NF membranes (namely NF270 and NF90) and three RO membranes (namely BW30, SW30 and UTC80) were used to provide a full spectrum of NF/RO membranes. The rejection of boron by all five membranes was pH-dependent. The dependency of boron rejection on the feed solution pH became much more substantial as the nominal salt (sodium or calcium) rejection value of the membrane decreased. At pH 11, boron rejections by the NF90 and the NF270 membranes were only ...


Reduction Of Hysteresis Losses In The Magnetic Refrigerant La0.8ce0.2fe11.4si1.6 By The Addition Of Boron, Precious Shamba, J.C Debnath, Rong Zeng, Jianli Wang, Stewart J. Campbell, S J. Kennedy, S. X. Dou 2011 University of Wollongong

Reduction Of Hysteresis Losses In The Magnetic Refrigerant La0.8ce0.2fe11.4si1.6 By The Addition Of Boron, Precious Shamba, J.C Debnath, Rong Zeng, Jianli Wang, Stewart J. Campbell, S J. Kennedy, S. X. Dou

Faculty of Engineering - Papers (Archive)

In an effort to improve the magnetocaloric effects of the NaZn13-type La0.8Ce0.2Fe11.4Si1.6 compound, the effect of boron doping on the magnetic properties and magnetocaloric properties has been investigated. The magnetic entropy change (ΔSM) for the La0.8Ce0.2Fe11.4Si1.6 compound, obtained for a field change of 0–5 T using the Maxwell relation exhibits a spike and appears to be overestimated and is thus corrected by using the Clausius-Clapeyron equation (CC). The ΔSM determined from the CC ...


Microwave Hydrothermal Synthesis Of Nano Co3o4 With Various Morphologies, Ben Niu, Liying Man, Jieqiang Wang 2011 University of Jinan China

Microwave Hydrothermal Synthesis Of Nano Co3o4 With Various Morphologies, Ben Niu, Liying Man, Jieqiang Wang

Faculty of Engineering - Papers (Archive)

"The precursors with various morphologies including nanowires, nanosheets, and hexagonal nanoplatelets were synthesized under different conditions by the microwave hydrothermal method. The precursors are transformed into Co(3)O(4) with various nanostructures through thermal decomposition. It is very important to synthesize the precursors controlling the microwave hydrothermal conditions, such as the mineralizer, the reaction temperature, and the reaction time. The microwave assisted hydrothermal approach presented here opens a potential avenue to explore the synthesis of various other metal oxides with different nanomorphologies."


Visualization Of Vortex Motion In Feas-Based Bafe1.9ni0.1as2 Single Crystal By Means Of Magneto-Optical Imaging, Zhi W. Lin, Yong Jian Li, Jian G. Zhu, Xiaolin Wang, S. X. Dou, Youguang Guo, Gang Lei, Yi Wang, Matthew Philips, Michael Cortie, Yan-Cheng Li, Ki-Young Choi, Xun Shi 2011 Univ Technol Sydney

Visualization Of Vortex Motion In Feas-Based Bafe1.9ni0.1as2 Single Crystal By Means Of Magneto-Optical Imaging, Zhi W. Lin, Yong Jian Li, Jian G. Zhu, Xiaolin Wang, S. X. Dou, Youguang Guo, Gang Lei, Yi Wang, Matthew Philips, Michael Cortie, Yan-Cheng Li, Ki-Young Choi, Xun Shi

Faculty of Engineering - Papers (Archive)

Superconductivity has been found in newly discovered iron-based compounds. This paper studies the motion of magnetic vortices in BaFe1.9Ni0.1As2 single crystal by means of the magneto-optical imaging technique. A series of magneto-optical images reflecting magnetic flux distribution at the crystal surface were taken when the crystal was zero-field cooled to 10 K. The behavior of the vortices, including penetration into and expulsion from the single crystal with increasing and decreasing external fields, respectively, is discussed. The motion behavior is similar to that observed in high-Tc superconducting cuprates with strong vortex pinning ...


Enhancement Of Actuation Ability Of Ionic-Type Conducting Polymer Actuators Using Metal Ion Implantation, G Alici, Andres Punning, Herbert R. Shea 2011 University of Wollongong

Enhancement Of Actuation Ability Of Ionic-Type Conducting Polymer Actuators Using Metal Ion Implantation, G Alici, Andres Punning, Herbert R. Shea

Faculty of Engineering - Papers (Archive)

In this study, we present the results and implications of an experimental study into the effect of gold-ion implantation on the actuation performance of ionic-type conducting polymer actuators, represented here by cantilevered tri-layer polypyrrole (PPy) actuators. We implant gold ions beneath the outer surfaces of PPy-based conducting polymer layers of the actuators in order to increase the conductivity of these layers, and therefore improve the overall conductivity of the actuators. A Filtered Vacuum Cathode Arc (FVCA) ion source was used to implant gold particles into the conducting polymer layers. Electrode resistance and capacitance, surface resistance, current response, mechanical work output ...


Practical Reliability Approach To Urban Slope Stability, R. Chowdhury, P. Flentje 2011 University of Wollongong

Practical Reliability Approach To Urban Slope Stability, R. Chowdhury, P. Flentje

Faculty of Engineering - Papers (Archive)

Assessing urban slope stability requires consideration of significant uncertainties including those associated with shear strength and pore water pressure. For site-specific studies, there is considerable merit in adopting a reliability approach within a probabilistic framework based on widely accepted geotechnical models. Regional slope stability studies are facilitated by using a GIS-based approach. Considerable effort is required to prepare regional data sets including topography and geology and to develop a landslide inventory. Reference is made to a comprehensive knowledge-based approach for assessing failure susceptibility and hazard within an urban region in Australia. Each hazard zone is associated with an estimated likelihood ...


Prevention No Cure: A Critique Of The Report Of Australia's National Preventative Health Taskforce, Alex Robson, Mark D. Harrison 2011 Griffith University

Prevention No Cure: A Critique Of The Report Of Australia's National Preventative Health Taskforce, Alex Robson, Mark D. Harrison

SMART Infrastructure Facility - Papers

No abstract provided.


Train Schedule Coordination At Interchange Station In An Open Railway Market Through Agent Negotiation, Chi W. Tsang, Tin K. Ho, Kwan Ho Ip 2011 Hong Kong Polytechnic University

Train Schedule Coordination At Interchange Station In An Open Railway Market Through Agent Negotiation, Chi W. Tsang, Tin K. Ho, Kwan Ho Ip

SMART Infrastructure Facility - Papers

In open railway markets, coordinating train schedules at an interchange station requires negotiation between two independent train operating companies to resolve their operational conflicts. This paper models the stakeholders as software agents and proposes an agent negotiation model to study their interaction. Three negotiation strategies have been devised to represent the possible objectives of the stakeholders, and they determine the behavior in proposing offers to the proponent. Empirical simulation results confirm that the use of the proposed negotiation strategies lead to outcomes that are consistent with the objectives of the stakeholders.


Mental Models: An Interdisciplinary Synthesis Of Theory And Methods, Natalie Jones, Helen Ross, Timothy Lynam, Pascal Perez, Anne Leitch 2011 University of Queensland

Mental Models: An Interdisciplinary Synthesis Of Theory And Methods, Natalie Jones, Helen Ross, Timothy Lynam, Pascal Perez, Anne Leitch

SMART Infrastructure Facility - Papers

Mental models are personal, internal representations of external reality that people use to interact with the world around them. They are constructed by individuals based on their unique life experiences, perceptions, and understandings of the world. Mental models are used to reason and make decisions and can be the basis of individual behaviors. They provide the mechanism through which new information is filtered and stored. Recognizing and dealing with the plurality of stakeholder’s perceptions, values, and goals is currently considered a key aspect of effective natural resource management (NRM) practice. Therefore, gaining a better understanding of how mental models ...


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