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Articles 1531 - 1560 of 2936
Full-Text Articles in Social and Behavioral Sciences
Characterisation Of Gas Turbine Dynamics During Frequency Excursions In Power Networks, Lasantha Meegahapola
Characterisation Of Gas Turbine Dynamics During Frequency Excursions In Power Networks, Lasantha Meegahapola
Faculty of Engineering and Information Sciences - Papers: Part A
Gas turbines inherently depict unique frequency response characteristics compared with other conventional synchronous generation technologies as their active power output is not entirely determined by the governor response during frequency deviations of the power network. Thus, gas turbine dynamics significantly influence on system stability during frequency events in power networks. Power system and power plant operators require improved understanding of the gas turbine characteristics during various frequency events in order to mitigate adverse impact on power system. Therefore a comparative analysis has been performed between combined-cycle gas turbines (CCGTs) and open-cycle gas turbines (OCGTs) in order to characterise the dynamic …
An Effective Localization Method For Robotic Endoscopic Capsules Using Multiple Positron Emission Markers, Trung Duc Than, Gursel Alici, Steven Harvey, Graeme O'Keefe, Hao Zhou, Weihua Li, Trent Cook, Sharon Alam-Fotias
An Effective Localization Method For Robotic Endoscopic Capsules Using Multiple Positron Emission Markers, Trung Duc Than, Gursel Alici, Steven Harvey, Graeme O'Keefe, Hao Zhou, Weihua Li, Trent Cook, Sharon Alam-Fotias
Faculty of Engineering and Information Sciences - Papers: Part A
The wireless capsule endoscope (WCE) is a first-line medical tool for the diagnosis of many gastrointestinal (GI) tract diseases such as obscure GI bleeding, Crohn's disease, small bowel tumors, and Celiac disease. Over the past few years, significant research attention has been paid to upgrading the WCE from a diagnostic-only tool to an active medical robot having not only diagnostic capabilities but therapeutic functionalities, such as biopsy, microsurgery, and targeted drug delivery, as well. One of the major limitations that impedes the development of such a robotic-type endoscope is the lack of a highly accurate localization system. In this paper, …
Numerical Modelling Of The Groundwater Inflow To An Advancing Open Pit Mine: Kolahdarvazeh Pit, Central Iran, Saeed Bahrami, Faramarz Doulati Ardejani, Soheyla Aslani, Ernest Baafi
Numerical Modelling Of The Groundwater Inflow To An Advancing Open Pit Mine: Kolahdarvazeh Pit, Central Iran, Saeed Bahrami, Faramarz Doulati Ardejani, Soheyla Aslani, Ernest Baafi
Faculty of Engineering and Information Sciences - Papers: Part A
The groundwater inflow into a mine during its life and after ceasing operations is one of the most important concerns of the mining industry. This paper presents a hydrogeological assessment of the Irankuh Zn-Pb mine at 20 km south of Esfahan and 1 km northeast of Abnil in west-Central Iran. During mine excavation, the upper impervious bed of a confined aquifer was broken and water at high-pressure flowed into an open pit mine associated with the Kolahdarvazeh deposit. The inflow rates were 6.7 and 1.4 m3/s at the maximum and minimum quantities, respectively. Permeability, storage coefficient, thickness and initial head …
Identity-Based Chameleon Hashing And Signatures Without Key Exposure, Xiaofeng Xiaofeng Chen, Fangguo Zhang, Willy Susilo, Haibo Tian, Jin Li, Kwangjo Kim
Identity-Based Chameleon Hashing And Signatures Without Key Exposure, Xiaofeng Xiaofeng Chen, Fangguo Zhang, Willy Susilo, Haibo Tian, Jin Li, Kwangjo Kim
Faculty of Engineering and Information Sciences - Papers: Part A
The notion of chameleon hash function without key exposure plays an important role in designing secure chameleon signatures. However, all of the existing key-exposure free chameleon hash schemes are presented in the setting of certificate-based systems. In 2004, Ateniese and de Medeiros questioned whether there is an efficient construction for identity-based chameleon hashing without key exposure. In this paper, we propose the first identity-based chameleon hash scheme without key exposure based on the three-trapdoor mechanism, which provides an affirmative answer to the open problem. Moreover, we use the proposed chameleon hash scheme to design an identity-based chameleon signature scheme, which …
Mri Distortion: Considerations For Mri Based Radiotherapy Treatment Planning, Amy Walker, Gary P. Liney, Peter E. Metcalfe, Lois Holloway
Mri Distortion: Considerations For Mri Based Radiotherapy Treatment Planning, Amy Walker, Gary P. Liney, Peter E. Metcalfe, Lois Holloway
Faculty of Engineering and Information Sciences - Papers: Part A
Distortion in magnetic resonance images needs to be taken into account for the purposes of radiotherapy treatment planning (RTP). A commercial MRI grid phantom was scanned on 4 different MRI scanners with multiple sequences to assess variations in the geometric distortion. The distortions present across the field of view were then determined. The effect of varying bandwidth on image distortion and signal to noise was also investigated. Distortion maps were created and these were compared to the location of patient anatomy within the scanner bore to estimate the magnitude and distribution of distortions located within specific clinical regions. Distortion magnitude …
The Effect Of Ageing On Microstructure And Mechanical Properties Of Powder Ti-5al-5mo-5v-1cr-1fe Alloy, Mansur Ahmed, Dmytro Savvakin, Orest M. Ivasishin, E V. Pereloma
The Effect Of Ageing On Microstructure And Mechanical Properties Of Powder Ti-5al-5mo-5v-1cr-1fe Alloy, Mansur Ahmed, Dmytro Savvakin, Orest M. Ivasishin, E V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
The thermo-mechanically processed powder Ti-5Al-5V-5Mo-1Cr-1Fe alloy was aged at 9.23 K for 1-8 h in order to investigate the effect of ageing time on the microstructure-mechanical properties relationships. The microstructures of the alloy after ageing cosist of the both primary and secondary alpha phases with retained B matrix phase. The shift of B peaks in X-ray pattern with ageing time indicates an increase in lattice parameter distorition due to diffusion into the retained B phase of more B stabilisers with smaller atomic radius compared to the elemental Ti. The tensile test results indicate that the sample aged for 1 h …
Purely Infinite Partial Crossed Products, Thierry Giordano, Adam Sierakowski
Purely Infinite Partial Crossed Products, Thierry Giordano, Adam Sierakowski
Faculty of Engineering and Information Sciences - Papers: Part A
Let (A, G, alpha) be a partial dynamical system. We show that there is a bijective corespondence between G-invariant ideals of A and ideals in the partial crossed prroduct A xalpha, r G provided the action is exact and residually topologically free.
Investigating The Optimal Passive And Active Vibration Controls Of Adjacent Buildings Based On Performance Indices Using Genetic Algorithms, Muhammad N. S Hadi, Mehmet Uz
Investigating The Optimal Passive And Active Vibration Controls Of Adjacent Buildings Based On Performance Indices Using Genetic Algorithms, Muhammad N. S Hadi, Mehmet Uz
Faculty of Engineering and Information Sciences - Papers: Part A
This study proposes the optimal passive and active damper parameters for achieving the best results in seismic response mitigation of coupled buildings connected to each other by dampers. The optimisation to minimise the H2 and H- norms in the performance indices is carried out by genetic algorithms (GAs). The final passive and active damper parameters are checked for adjacent buildings connected to each other under El Centro NS 1940 and Kobe NS 1995 excitations. Using real coded GA in H- norm, the optimal controller gain is obtained by different combinations of the measurement as the feedback for designing the control …
Impact Of 1-Hydroxybenzotriazole Dosing On Trace Organic Contaminant Degradation By Laccase, Ngoc Luong Nguyen, Faisal Ibney Hai, Jinguo Kang, S Faraj Magram, William Price, Long Nghiem
Impact Of 1-Hydroxybenzotriazole Dosing On Trace Organic Contaminant Degradation By Laccase, Ngoc Luong Nguyen, Faisal Ibney Hai, Jinguo Kang, S Faraj Magram, William Price, Long Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study investigated the removal of five selected non-phenolic trace organic contaminants (TrOC) by extracellular enzyme extract from a white-rot fungus. Except diclofenac, no other investigated non-phenolic TrOC were degraded by the extracellular enzyme extract. Improvement of enzymatic degradation of all TrOC was achieved in the presence of a redox mediator, namely, 1-hydroxybenzotriazole (HBT). However, the enhancement of degradation was mediator concentration-specific. A significant improvement in degradation at higher dosage than 0.1 mM (HBT) was achieved.
Relating Rejection Of Trace Organic Contaminants To Membrane Properties In Forward Osmosis: Measurements, Modelling And Implications, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech
Relating Rejection Of Trace Organic Contaminants To Membrane Properties In Forward Osmosis: Measurements, Modelling And Implications, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech
Faculty of Engineering and Information Sciences - Papers: Part A
This study elucidates the relationship between membrane properties and the rejection of trace organic contaminants (TrOCs) in forward osmosis (FO). An asymmetric cellulose triacetate (CTA) and a thin-film composite (TFC) polyamide FO membrane were used for this investigation. The effective average pore radius (rp), selective barrier thickness over porosity parameter (l/ε), surface charge, support layer structural parameter (S), pure water permeability coefficient (A) and salt (NaCl) permeability coefficient (B) of the two membranes were systematically characterised. Results show that measured rejection of TrOCs as a function of permeate water flux can be well described by the pore hindrance transport model. …
Aligning Ontology-Based Development With Service Oriented Systems, Jun Shen, Ghassan Beydoun, Graham Low, Lijuan Wang
Aligning Ontology-Based Development With Service Oriented Systems, Jun Shen, Ghassan Beydoun, Graham Low, Lijuan Wang
Faculty of Engineering and Information Sciences - Papers: Part A
This paper argues for placing ontologies at the centre of the software development life cycle for distributed component-based systems and, in particular, for service-oriented systems. It presents an ontology-based development process which relies on three levels of abstraction using ontologies: architecture layer, application layer and domain layer. The paper discusses the key roles of ontologies with respect to the various abstraction layers and their corresponding impact on the concomitant workproducts. In addition, a peer-to-peer-based service selecting and composing tool is suggested as a way of supporting the process. The paper presents the architecture of the proposed tool and illustrates the …
Defects Induced Ferromagnetism In Plasma-Enabled Graphene Nanopetals, Zengji Yue, Donghan Seo, Kostya Ostrikov, Xiaolin Wang
Defects Induced Ferromagnetism In Plasma-Enabled Graphene Nanopetals, Zengji Yue, Donghan Seo, Kostya Ostrikov, Xiaolin Wang
Faculty of Engineering and Information Sciences - Papers: Part A
Ferromagnetism in graphene is fascinating, but it is still a big challenge for practical applications due to the weak magnetization. In order to enhance the magnetization, here, we design plasma-enabled graphene nanopetals with ultra-long defective edges of up to 105 m/g, ultra-dense lattice vacancies, and hydrogen chemisorptions. The designed graphene nanopetals display robust ferromagnetism with large saturation magnetization of up to 2 emu/g at 5 K and 1.2 emu/g at room temperatures. This work identifies the plasma-enabled graphene nanopetals as a promising candidate for graphene-based magnetic devices. 2014 AIP Publishing LLC.
Sludge Cycling Between Aerobic, Anoxic And Anaerobic Regimes To Reduce Sludge Production During Wastewater Treatment: Performance, Mechanisms, And Implications, Galilee Semblante, Faisal Ibney Hai, Huu H. Ngo, Wenshan Guo, Sheng-Jie You, William Price, Long Nghiem
Sludge Cycling Between Aerobic, Anoxic And Anaerobic Regimes To Reduce Sludge Production During Wastewater Treatment: Performance, Mechanisms, And Implications, Galilee Semblante, Faisal Ibney Hai, Huu H. Ngo, Wenshan Guo, Sheng-Jie You, William Price, Long Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
Alternate cycling of sludge in aerobic, anoxic, and anaerobic regimes is a promising strategy that can reduce the sludge yield of conventional activated sludge (CAS) by up to 50% with potentially lower capital and operating cost than physical- and/or chemical-based sludge minimisation techniques. The mechanisms responsible for reducing sludge yield include alterations to cellular metabolism and feeding behaviour (metabolic uncoupling, feasting/fasting, and endogenous decay), biological floc destruction, and predation on bacteria by higher organisms. Though discrepancies across various studies are recognisable, it is apparent that sludge retention time, oxygen-reduction potential of the anaerobic tank, temperature, sludge return ratio and loading …
Mr-Less Surface-Based Amyloid Assessment Based On 11c Pib Pet, Luping Zhou, Oliver Salvado, Vincent Dore, Pierrick Bourgeat, Parnesh Raniga, S Lance Macaulay, David Ames, Colin L. Masters, Katherine A. Ellis, Victor L. Villemagne, Christopher Rowe, Jurgen Fripp
Mr-Less Surface-Based Amyloid Assessment Based On 11c Pib Pet, Luping Zhou, Oliver Salvado, Vincent Dore, Pierrick Bourgeat, Parnesh Raniga, S Lance Macaulay, David Ames, Colin L. Masters, Katherine A. Ellis, Victor L. Villemagne, Christopher Rowe, Jurgen Fripp
Faculty of Engineering and Information Sciences - Papers: Part A
Background: b-amyloid (Ab) plaques in brain’s grey matter (GM) are one of the pathological hallmarks of Alzheimer’s disease (AD), and can be imaged in vivo using Positron Emission Tomography (PET) with 11C or 18F radiotracers. Estimating Ab burden in cortical GM has been shown to improve diagnosis and monitoring of AD. However, lacking structural information in PET images requires such assessments to be performed with anatomical MRI scans, which may not be available at different clinical settings or being contraindicated for particular reasons. This study aimed to develop an MR-less Ab imaging quantification method that requires only PET images for …
Online Voltage Control In Distribution Systems With Multiple Voltage Regulating Devices, Dothinka Ranamuka Rallage, Ashish Agalgaonkar, Kashem Muttaqi
Online Voltage Control In Distribution Systems With Multiple Voltage Regulating Devices, Dothinka Ranamuka Rallage, Ashish Agalgaonkar, Kashem Muttaqi
Faculty of Engineering and Information Sciences - Papers: Part A
Voltage regulation in distribution systems is typically performed with the aid of multiple voltage regulating devices, such as on-load tap changer and step voltage regulators. These devices are conventionally tuned and locally coordinated using Volt/VAR optimization strategies in accordance with the time-graded operation. However, in case of distribution systems with distributed generation (DG), there could be a possibility of simultaneous responses of DG and multiple voltage regulators for correcting the target bus voltage, thereby resulting in operational conflicts. This paper proposes an online voltage control strategy for a realistic distribution system containing a synchronous machine-based renewable DG unit and other …
The Effect Of Processing Parameters On The Microstructure And Mechanical Properties Of Low-Si Transformation-Induced Plasticity Steels, Fayez Alharbi, Azdiar A. Gazder, Andrii Kostryzhev, Bruno C. De Cooman, Elena Pereloma
The Effect Of Processing Parameters On The Microstructure And Mechanical Properties Of Low-Si Transformation-Induced Plasticity Steels, Fayez Alharbi, Azdiar A. Gazder, Andrii Kostryzhev, Bruno C. De Cooman, Elena Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
A base low Si, high-A1 transformation-induced plasticity (TRIP) steel and one with 0.03Nb and 0.002Ti (wt percent) additions were subjected to thermo-mechanical processing (TMP) and galvanising simulations. T
Evidence Of Solid-Solution Reaction Upon Lithium Insertion Into Cryptomelane K0.25mn2o4 Material, Wei Kong Pang, Vanessa Peterson, Neeraj Sharma, Chaofeng Zhang, Zaiping Guo
Evidence Of Solid-Solution Reaction Upon Lithium Insertion Into Cryptomelane K0.25mn2o4 Material, Wei Kong Pang, Vanessa Peterson, Neeraj Sharma, Chaofeng Zhang, Zaiping Guo
Faculty of Engineering and Information Sciences - Papers: Part A
Cryptomelane-type K0.25Mn2O4 material is prepared via a template-free, one-step hydrothermal method. Cryptomelane K0.25Mn2O4 adopts an I 4/m tetragonal structure with a distinct tunnel feature built from MnO6 units. Its structural stability arises from the inherent stability of the MnO6 framework which hosts potassium ions, which in turn permits faster ionic diffusion, making the material attractive for application as a cathode in lithium-ion batteries. Despite this potential use, the phase transitions and structural evolution of cryptomelane during lithiation and delithiation remains unclear. The coexistence of Mn3+ and Mn4+ in the compound during lithiation and delithiation processes induce different levels of Jahn-Teller …
The Instructional Information Processing Account Of Digital Computation, Nir Fresco, Marty J. Wolf
The Instructional Information Processing Account Of Digital Computation, Nir Fresco, Marty J. Wolf
Faculty of Engineering and Information Sciences - Papers: Part A
What is nontrivial digital computation?It is the processing of discrete data through discrete state transitions in accordance with finite instructional information. The motivation for our account is that many previous attempts to answer this question are inadequate, and also that this account accords with the common intuition that digital computation is a type of information processing. We use the notion of reachability in a graph to defend this characterization in memory-based systems and underscore the importance of instructional information for digital computation. We argue that our account evaluates positively against adequacy criteria for accounts of computation.
3d Fem Analysis Of Strip Shape During Multi-Pass Rolling In A 6-High Cvc Cold Rolling Mill, Kezhi Linghu, Zhengyi Jiang, Jingwei Zhao, Fei Li, Dongbin Wei, Jianzhong Xu, Xiaoming Zhang, Xianming Zhao
3d Fem Analysis Of Strip Shape During Multi-Pass Rolling In A 6-High Cvc Cold Rolling Mill, Kezhi Linghu, Zhengyi Jiang, Jingwei Zhao, Fei Li, Dongbin Wei, Jianzhong Xu, Xiaoming Zhang, Xianming Zhao
Faculty of Engineering and Information Sciences - Papers: Part A
A 3D elastic–plastic finite element method (FEM) model of cold strip rolling for 6-high continuous variable crown (CVC) control rolling mill was developed. This model considers the boundary conditions such as accurate CVC curves, total rolling forces, total bending forces and roll shifting values. The rolling force distributions were obtained by the internal iteration processes instead of being treated as model boundary conditions. The calculated error has been significantly reduced by the developed model. Based on the rolling schedule data from a 1,850-mm CVC cold rolling mill, the absolute error between the simulated results and the actual values is obtained …
Developing A Tool For Crowd-Sourced Verification Of A Radiation Oncology Ontology: A Summer Project, Joshua Pratt, Vishal Pandian, Evan Morrison, Andrew Alexis Miller
Developing A Tool For Crowd-Sourced Verification Of A Radiation Oncology Ontology: A Summer Project, Joshua Pratt, Vishal Pandian, Evan Morrison, Andrew Alexis Miller
Faculty of Engineering and Information Sciences - Papers: Part A
We have been unable to nd a verifi ed, published Radiation Oncology Ontology. We undertook the process of verifying a Radiation Oncology Ontology with a mixture of crowd-sourcing and expert-based approaches to verify relationships in the ontology. We used a natural language based approach to portray concepts and relationships, surveying users to assess the relationships between concepts in the Radiation Oncology ontology. The work used a description of a patient's history expressed in XML.The natural language statements relating concepts are available on a website for veri cation, and readers are invited to complete the survey at http://coi-hs-survey.appspot.com/ to contribute.
War Robots And The 2014 World Cup - Defenders Off The Field, Katina Michael, M G. Michael
War Robots And The 2014 World Cup - Defenders Off The Field, Katina Michael, M G. Michael
Faculty of Engineering and Information Sciences - Papers: Part A
High-tech robots called PackBots will be unleashed during the 2014 FIFA World Cup in Brazil to help boost security and examine suspicious objects. The Brazilian government purportedly spent US$7.2 million to buy 30 military-grade robots from designers iRobot that will police the stadiums throughout Brazil's 12 host cities during soccer matches. PackBot is a hunk of metal with an extendable arm and tactile claw, jam-packed on-board sensors and a computer with overheat protection, nine high-resolution cameras and lasers and two-way audio. But is it overkill to implement wartime robots to a sporting event?
An Adaptive Neuro Fuzzy Hybrid Control Strategy For A Semiactive Suspension With Magneto Rheological Damper, Pipit Wahyu Nugroho, Weihua Li, Haiping Du, Gursel Alici, Jian Yang
An Adaptive Neuro Fuzzy Hybrid Control Strategy For A Semiactive Suspension With Magneto Rheological Damper, Pipit Wahyu Nugroho, Weihua Li, Haiping Du, Gursel Alici, Jian Yang
Faculty of Engineering and Information Sciences - Papers: Part A
The main function of a vehicle suspension system is to isolate the vehicle body from external excitation in order to improve passenger comfort and road holding and to stabilise its movement. This paper considers the implementation of an adaptive neuro fuzzy inference system (ANFIS) with a fuzzy hybrid control technique to control a quarter vehicle suspension system with a semiactive magneto rheological (MR) damper. A quarter car suspension model is set up with an MR damper and a semiactive controller consisting of a fuzzy hybrid skyhook-groundhook controller and an ANFIS model is also designed. The fuzzy hybrid controller is used …
Behaviour Of Clay-Fouled Ballast Under Cyclic Loading, Nayoma Tennakoon, Buddhima Indraratna
Behaviour Of Clay-Fouled Ballast Under Cyclic Loading, Nayoma Tennakoon, Buddhima Indraratna
Faculty of Engineering and Information Sciences - Papers: Part A
Expansion of the rail network in congested coastal Australia compels track construction on soft clayey subgrade, including fine-grained estuarine soils. In such low-lying areas, where the water table is close to the ground surface, the saturated soft subgrade is often subjected to pumping (mud slurry) under the application of cyclic wheel loads, thereby causing fouling of the overlying ballast. This technical note presents the results of a series of large-scale, drained, cyclic, triaxial tests conducted on clay-fouled ballast. The impact of fouling on the stress-strain behaviour, resilient modulus and degradation of ballast is discussed.
Computational Analysis Of Compressive Strain Hardening Exponents Of Bimetal With Pearlitic Steel And Low Carbon Steel, Xingjian Gao, Zhengyi Jiang, Dongbin Wei, Sihai Jiao, Jingtao Han
Computational Analysis Of Compressive Strain Hardening Exponents Of Bimetal With Pearlitic Steel And Low Carbon Steel, Xingjian Gao, Zhengyi Jiang, Dongbin Wei, Sihai Jiao, Jingtao Han
Faculty of Engineering and Information Sciences - Papers: Part A
The compressive strain hardening behaviour of a novel bimetal with pearlitic steel and low carbon steel was investigated by computational analysis based on the isothermal compression tests in a wide range of deformation temperature and strain rate. The Hollomon's equation was employed to calculate the strain hardening exponent (SHE) with the assistance of mathematical manipulation. The result shows that the logarithmic relationship between the flow stress and plastic strain of the bimetal is highly non-linear, which results in the variation of the SHE of the bimetal. This variation reflects the dynamic competition between the strain hardening and softening mechanism by …
Energy Capture Optimisation Of 1-Degree-Of-Freedom Pivoted Rigid Cylinders Undergoing Flow-Induced Vibration In Cross-Flows, Andrew D. Johnstone, Brad Stappenbelt
Energy Capture Optimisation Of 1-Degree-Of-Freedom Pivoted Rigid Cylinders Undergoing Flow-Induced Vibration In Cross-Flows, Andrew D. Johnstone, Brad Stappenbelt
Faculty of Engineering and Information Sciences - Papers: Part A
Experiments were conducted to study the energy capture performance of a pivoted rigid cylinder undergoing flow-induced vibration (FIV) in water cross-flow and assess its potential as a renewable energy technology.
Microstructure And Texture Analysis Of Δ-Hydride Precipitation In Zircaloy-4 Materials By Electron Microscopy And Neutron Diffraction, Zhiyang Wang, Ulf Garbe, Huijun Li, Yanbo Wang, Andrew J. Studer, Guangai Sun, Robert P. Harrison, Xiaozhou Dr Xiaozhou Liao, M A. Vicente Alvarez, J R. Santisteban, Charlie Kong
Microstructure And Texture Analysis Of Δ-Hydride Precipitation In Zircaloy-4 Materials By Electron Microscopy And Neutron Diffraction, Zhiyang Wang, Ulf Garbe, Huijun Li, Yanbo Wang, Andrew J. Studer, Guangai Sun, Robert P. Harrison, Xiaozhou Dr Xiaozhou Liao, M A. Vicente Alvarez, J R. Santisteban, Charlie Kong
Faculty of Engineering and Information Sciences - Papers: Part A
This work presents a detailed microstructure and texture study of various hydrided Zircaloy-4 materials by neutron diffraction and microscopy. The results show that the precipitated δ-ZrH1.66 generally follows the δ(111)//α(0001) and δ[ ]//α[ ] orientation relationship with the α-Zr matrix. The δ-hydride displays a weak texture that is determined by the texture of the α-Zr matrix, and this dependence essentially originates from the observed orientation correlation between α-Zr and δ-hydride. Neutron diffraction line profile analysis and high-resolution transmission electron microscopy observations reveal a significant number of dislocations present in the δ-hydride, with an estimated average density one order of magnitude …
Observations On The Zirconium Hydride Precipitation And Distribution In Zircaloy-4, Zhiyang Wang, Ulf Garbe, Huijun Li, Robert P. Harrison, Anders Kaestner, Eberhard Lehmann
Observations On The Zirconium Hydride Precipitation And Distribution In Zircaloy-4, Zhiyang Wang, Ulf Garbe, Huijun Li, Robert P. Harrison, Anders Kaestner, Eberhard Lehmann
Faculty of Engineering and Information Sciences - Papers: Part A
Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered diffraction techniques. The precipitated hydride platelet (δ-ZrH1.66) at a hydrogen pressure of 20 atm was found following the {111}δ-ZrH1.66//(0001) α-Zr with the surrounding α-Zr matrix. The microstructural characterization indicated that hydrides with a relatively uniform distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normal-transverse section, a hydride concentration gradient was present with a dense hydride layer near the surface. Further, the neutron tomography investigations …
Characterization Of In-Situ Alloyed And Additively Manufactured Titanium Aluminides, Yan Ma, Dominic Cuiuri, Nicholas P. Hoye, Huijun Li, Zengxi Pan
Characterization Of In-Situ Alloyed And Additively Manufactured Titanium Aluminides, Yan Ma, Dominic Cuiuri, Nicholas P. Hoye, Huijun Li, Zengxi Pan
Faculty of Engineering and Information Sciences - Papers: Part A
Titanium aluminide components were fabricated using in-situ alloying and layer additive manufacturing based on the gas tungsten arc welding process combined with separate wire feeding of titanium and aluminum elements. The new fabrication process promises significant time and cost saving in comparison to traditional methods. In the present study, issues such as processing parameters, microstructure, and properties are discussed. The results presented here demonstrate the potential to produce full density titanium aluminide components directly using the new technique. 2014 The Minerals, Metals & Materials Society and ASM International.
Structure Of The Li4ti5o12 Anode During Charge-Discharge Cycling, Wei Kong Pang, Vanessa Peterson, Neeraj Sharma, Je-Jang Shiu, She-Huang Wu
Structure Of The Li4ti5o12 Anode During Charge-Discharge Cycling, Wei Kong Pang, Vanessa Peterson, Neeraj Sharma, Je-Jang Shiu, She-Huang Wu
Faculty of Engineering and Information Sciences - Papers: Part A
The structural evolution of the "zero-strain" Li4Ti5O12 anode within a functioning Li-ion battery during charge-discharge cycling was studied using in situ neutron powder-diffraction, allowing correlation of the anode structure to the measured charge-discharge profile. While the overall lattice response controls the "zero-strain" property, the oxygen atom is the only variable in the atomic structure and responds to the oxidation state of the titanium, resulting in distortion of the TiO6 octahedron and contributing to the anode's stability upon lithiation/delithiation. Interestingly, the trend of the octahedral distortion on charge-discharge does not reflect that of the lattice parameter, with the latter thought to …
An Elementary Approach To C*-Algebras Associated To Topological Graphs, Hui Li, David Pask, Aidan Sims
An Elementary Approach To C*-Algebras Associated To Topological Graphs, Hui Li, David Pask, Aidan Sims
Faculty of Engineering and Information Sciences - Papers: Part A
We develop notions of a representation of a toopological grapph E and of a covariant representation of a topological graph E which do onot require the machinery of C* -correspondences and Cuntz-Pimsner alegebars. We show that the C* -algebra generated by a universal representation of E is isomorphic to the Toeplitz algebra of Katsura's topological-graph bimodule, and that the C* palgebra generated by a universal covariant representation of E is isomorphic to Katsura's topological graph C* -algebra. We exhibit our resluts by constructing the isomorphism between the C* -algebra of the row-finite directed graph E with no sources and the …