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Articles 571 - 589 of 589
Full-Text Articles in Engineering
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 …
An Approximation Method For Improving Dynamic Network Model Fitting, Nicole B. Carnegie, Pavel N. Krivitsky, David R. Hunter, Steven M. Goodreau
An Approximation Method For Improving Dynamic Network Model Fitting, Nicole B. Carnegie, Pavel N. Krivitsky, David R. Hunter, Steven M. Goodreau
Faculty of Engineering and Information Sciences - Papers: Part A
There has been a great deal of interest recently in the modeling and simulation of dynamic networks, i.e., networks that change over time. One promising model is the separable temporal exponential-family random graph model (ERGM) of Krivitsky and Handcock, which treats the formation and dissolution of ties in parallel at each time step as independent ERGMs. However, the computational cost of fitting these models can be substantial, particularly for large, sparse networks. Fitting cross-sectional models for observations of a network at a single point in time, while still a non-negligible computational burden, is much easier. This paper examines model fitting …
Transforming Decision-Making Processes: A Research Agenda For Understanding The Impact Of Business Analytics On Organisations, Rajeev Sharma, Sunil Mithas, Atreyi Kankanhalli
Transforming Decision-Making Processes: A Research Agenda For Understanding The Impact Of Business Analytics On Organisations, Rajeev Sharma, Sunil Mithas, Atreyi Kankanhalli
Faculty of Engineering and Information Sciences - Papers: Part A
Much attention is currently being paid in both the academic and practitioner literatures to the value that organisations could create through the use of big data and business analytics (Gillon et al, 2012; Mithas et al, 2013). For instance, Chen et al (2012, p. 1166–1168) suggest that business analytics and related technologies can help organisations to ‘better understand its business and markets’ and ‘leverage opportunities presented by abundant data and domain-specific analytics’. Similarly, LaValle et al (2011, p. 22) report that top-performing organisations ‘make decisions based on rigorous analysis at more than double the rate of lower performing organisations’ and …
Surface Modification Of Titanium And Its Alloys For Biomedical Application, Liang Luo, Zhengyi Jiang, Dongbin Wei, Xiaofeng He
Surface Modification Of Titanium And Its Alloys For Biomedical Application, Liang Luo, Zhengyi Jiang, Dongbin Wei, Xiaofeng He
Faculty of Engineering and Information Sciences - Papers: Part A
Titanium and its alloys have excellent properties and are promising biomaterial in medical engineering field. A bioactive surface on a Ti substrate is a prerequisite for great performance and long service life of implants. Based on the mechanism for inducing cell/tissue responses, three kinds of methods, namely morphological, physicochemical and biochemical methods, are reviewed in this paper. Hybrid methods that integrate individual methods or have additional functions are also discussed.
Dynamic Stability Analysis For A Self-Mixing Interferometry System, Yuanlong Fan, Yanguang Yu, Jiangtao Xi, Qinghua Guo
Dynamic Stability Analysis For A Self-Mixing Interferometry System, Yuanlong Fan, Yanguang Yu, Jiangtao Xi, Qinghua Guo
Faculty of Engineering and Information Sciences - Papers: Part A
A self-mixing interferometry (SMI) system is a laser diode (LD) with an external cavity formed by a moving external target. The behavior of an SMI system is governed by the injection current J to the LD and the parameters associated with the external cavity mainly including optical feedback factor C , the initial external cavity length ( L0 ) and the light phase (∅0) which is mapped to the movement of the target. In this paper, we investigate the dynamic behavior of an SMI system by using the Lang-Kobayashi model. The stability boundary of such system is presented in the …
Behaviour Of Hollow Core Square Reinforced Concrete Columns Wrapped With Cfrp With Different Fibre Orientations, Muhammad N. Hadi, T D. Le
Behaviour Of Hollow Core Square Reinforced Concrete Columns Wrapped With Cfrp With Different Fibre Orientations, Muhammad N. Hadi, T D. Le
Faculty of Engineering and Information Sciences - Papers: Part A
Results of testing twelve hollow core square reinforced concrete columns wrapped with Carbon fibre 33 reinforced polymer (CFRP) are presented. The effect of fibre orientation on the performance of specimens 34 under concentric and eccentric loads was investigated. Twelve specimens were divided into four groups with three 36 specimens each. The specimens in the first reference group were unwrapped, while the specimens in the 37 remaining groups were wrapped with CFRP of different wrap combinations of three fibre orientations.The specimens in each group were tested 39 under three eccentricities: 0 (concentric), 25, and 50 mm up to failure. Test results …
Characterisation Of Flicker Emission And Propagation In Distribution Networks With Bi-Directional Power Flows, D Perera, L Meegahapola, S Perera, P Ciufo
Characterisation Of Flicker Emission And Propagation In Distribution Networks With Bi-Directional Power Flows, D Perera, L Meegahapola, S Perera, P Ciufo
Faculty of Engineering and Information Sciences - Papers: Part A
With the increasing penetration levels of intermittent and fluctuating energy sources such as wind generating systems in the electricity grid, resulting voltage fluctuations and flicker can be expected to become an important power quality considerations. Due to significant bidirectional power flows resulting from large renewable power generation systems connected to downstream, voltage fluctuations may propagate from downstream to upstream. The work presented in this paper investigates and characterises flicker emission and propagation resulting from fluctuating generating sources connected to a distribution network. Mathematical models are developed for flicker emission under different generator control strategies and flicker propagation to upstream network. …