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Articles 1  30 of 39
FullText Articles in Social and Behavioral Sciences
An Adaptive Channel Tracking Method For Mimo Ofdm Systems, Jun Tong, Yaohuan Gong, Shengxian Sun
An Adaptive Channel Tracking Method For Mimo Ofdm Systems, Jun Tong, Yaohuan Gong, Shengxian Sun
Faculty of Engineering and Information Sciences  Papers: Part A
The tracking of the timevarying channel is crucial for MIMOOFDM wireless communication systems. Aiming at doublyselective fading MIMO channels, we present a novel pilot pattern and the corresponding adaptive channel tracking algorithm. Compared with the traditional pilot patterns, the new pattern has higher frequency efficiency and is more suitable for large transmit arrays. The computational complexity, frequency efficiency and BER performance of the system assisted by the proposed channel tracking scheme are analyzed. Simulation results demonstrate that the proposed scheme can track the timevarying channel effectively
A Note On Devaney's Definition Of Chaos, Joseph Tonien
A Note On Devaney's Definition Of Chaos, Joseph Tonien
Faculty of Engineering and Information Sciences  Papers: Part A
Devaney defines a function to be chaotic if it satisfies three conditions: transitivity, having dense set of periodic points and sensitive dependence on initial conditions. Banks et al prove that if the function is continuous then the third conditioin is implied from the first two and therefore is redundant. However, if the function is not assumed to be continuous, then it is not known if the third condition is redundant or not.
In this note, without assuming the function is continuous, we prove that the third condition is redundant if the underlying topological space is not precompact.
Linear Code Implies PublicfKey Traitor Tracing With Revocation, Joseph Tonien, Rei SafaviNaini
Linear Code Implies PublicfKey Traitor Tracing With Revocation, Joseph Tonien, Rei SafaviNaini
Faculty of Engineering and Information Sciences  Papers: Part A
In this paper, we show that the linearcoded Kurosawa–Desmedt scheme can be modified to allow revocation of users, that is to show a revocation scheme can be derived from a linear code.
Using SelfRegulated Learning To Manage The Discomfort Of Becoming Fluent With Information Technology, Victoria M. Neville, Sue Bennett
Using SelfRegulated Learning To Manage The Discomfort Of Becoming Fluent With Information Technology, Victoria M. Neville, Sue Bennett
Faculty of Engineering and Information Sciences  Papers: Part A
The technologically complex and changing world of the twenty first century requires teachers who are both knowledgeable and skilled in using information technology in their pedagogical practices. The changing nature of information technology means that teachers need to be flexible in how they use information technology in their teaching, adaptable to the changes in technological developments, problem solvers in unfamiliar circumstances, and continuing learners throughout their professional life. These ideas are encapsulated in the concept of fluency with information technology, or FITness (Committee on Information Technology Literacy, 1999). This research study, in progress, uses an interpretive, qualitative methodological approach to ...
Community Technology Centres: A Proposed Framework For Sustainability, William J. Tibben, Carole A. Alcock
Community Technology Centres: A Proposed Framework For Sustainability, William J. Tibben, Carole A. Alcock
Faculty of Engineering and Information Sciences  Papers: Part A
The effectiveness of Community Technology Centres (CTCs) in meeting many of the challenges presented by the digital divide invites a closer scrutiny of factors that contribute to their sustainability. The success of CTCs appears to be related to the way in which these initiatives are able to respond to the multifaceted nature of the digital divide problem. However, more systematic approaches are required to enable the identification of common factors that contribute to sustainability in different contexts. The paper responds to this challenge by initially reviewing recent contributions on the digital divide debate. From a more refined understanding of what ...
Energy Injection By Distributed Generation For Improvement In FeederVoltage Profile, Kashem M. Muttaqi, Gerard Ledwich
Energy Injection By Distributed Generation For Improvement In FeederVoltage Profile, Kashem M. Muttaqi, Gerard Ledwich
Faculty of Engineering and Information Sciences  Papers: Part A
No abstract provided.
FiniteElement Analysis To Determine Effect Of Monolimb Flexibility On Structural Strength And Interaction Between Residual Limb And Prosthetic Socket, Winson Lee, Ming Zhang, David A. Boone, Bill Contoyannis
FiniteElement Analysis To Determine Effect Of Monolimb Flexibility On Structural Strength And Interaction Between Residual Limb And Prosthetic Socket, Winson Lee, Ming Zhang, David A. Boone, Bill Contoyannis
Faculty of Engineering and Information Sciences  Papers: Part A
Monolimb refers to a kind of transtibial prostheses having the socket and shank molded into one piece of thermoplastic material. One of its characteristics is that the shank is made of a material that can deform during walking, which can simulate ankle joint motion to some extent. Changes in shank geometry can alter the stress distribution within the monolimb and at the residual limbsocket interface and, respectively, affect the deformability and structural integrity of the prosthesis and comfort perceived by amputees. This paper describes the development of a finiteelement model for the study of the structural behavior of monolimbs with ...
Finite Element Modeling Of Contact Interface Between TransTibial Residual Limb And Prosthetic Socket, Winson Lee, Ming Zhang, Xiaohong Jia, Jason Cheung
Finite Element Modeling Of Contact Interface Between TransTibial Residual Limb And Prosthetic Socket, Winson Lee, Ming Zhang, Xiaohong Jia, Jason Cheung
Faculty of Engineering and Information Sciences  Papers: Part A
Finite element method has been identified as a useful tool to understand the load transfer mechanics between a residual limb and its prosthetic socket. This paper proposed a new practical approach in modeling the contact interface with consideration of the friction/slip conditions and prestresses applied on the limb within a rectified socket. The residual limb and socket were modeled as two separate structures and their interactions were simulated using automated contact methods. Some regions of the limb penetrated into the socket because of socket modification. In the first step of the simulation, the penetrated limb surface was moved onto ...
Load Transfer Mechanics Between TransTibial Prosthetic Socket And Residual LimbDynamic Effects, Xiaohong Jia, Ming Zhang, Winson Lee
Load Transfer Mechanics Between TransTibial Prosthetic Socket And Residual LimbDynamic Effects, Xiaohong Jia, Ming Zhang, Winson Lee
Faculty of Engineering and Information Sciences  Papers: Part A
The effects of inertial loads on the interface stresses between transtibial residual limb and prosthetic socket were investigated. The motion of the limb and prosthesis was monitored using a Vicon motion analysis system and the ground reaction force was measured by a force platform. Equivalent loads at the knee joint during walking were calculated in two cases with and without consideration of the material inertia. A 3D nonlinear finite element (FE) model based on the actual geometry of residual limb, internal bones and socket liner was developed to study the mechanical interaction between socket and residual limb during walking. To ...
Maple+Grtensorii Libraries For Cosmology, Dumitru N. Vulcanov, ValentinaMira Wheeler
Maple+Grtensorii Libraries For Cosmology, Dumitru N. Vulcanov, ValentinaMira Wheeler
Faculty of Engineering and Information Sciences  Papers: Part A
The article mainly presents some results in using MAPLE platform for com puter algebra (CA) and GrTensorII package in doing calculations for theoretical and numerical cosmology.
The Limiting Ideal Theory For ShearIndex Cohesionless Granular Materials, Grant Cox, James Hill
The Limiting Ideal Theory For ShearIndex Cohesionless Granular Materials, Grant Cox, James Hill
Faculty of Engineering and Information Sciences  Papers: Part A
To model cohesionless granular flow using continuum theory, the usual approach is to assume the cohesionless CoulombMohr yield condition. However, this yield condition assumes that the angle of internal friction is constant, when according to experimental evidence for most powders the angle of internal friction is not constant along the yield locus, but decreases for decreasing normal stress component σ from a maximum value of π/2. For this reason, we consider here the more general yield function which applies for shearindex granular materials, where the angle of internal friction varies with σ. In this case, failure due to frictional ...
Bifurcation Phenomena For An Oxidation Reaction In A Continuously Stirred Tank Reactor. Ii Diabatic Operation, Mark Nelson, Harvinder Sidhu
Bifurcation Phenomena For An Oxidation Reaction In A Continuously Stirred Tank Reactor. Ii Diabatic Operation, Mark Nelson, Harvinder Sidhu
Faculty of Engineering and Information Sciences  Papers: Part A
We extend an investigation into the bifurcation phenomena exhibited by an oxidation reaction in an adiabatic reactor to the case of a diabatic reactor. The primary bifurcation parameter is the fuel fraction; the inflow pressure and inflow temperature are the secondary bifurcation parameters. The inclusion of heat loss in the model does not change the static steadystate bifurcation diagram; the organising centre is a pitchfork singularity for both the adiabatic and diabatic reactors. However, unlike the adiabatic reactor, Hopf bifurcations may occur in the diabatic reactor. We construct the degenerate Hopf bifurcation curve by determining the doubleHopf locus. When the ...
An Investigation Into The Effects Of Heat Transfer On The Motion Of A Spherical Bubble, P J Harris, H AlAwadi, Wee King Soh
An Investigation Into The Effects Of Heat Transfer On The Motion Of A Spherical Bubble, P J Harris, H AlAwadi, Wee King Soh
Faculty of Engineering and Information Sciences  Papers: Part A
This paper investigates the effect of heat transfer on the motion of a spherical bubble in the vicinity of a rigid boundary. The effects of heat transfer between the bubble and the surrounding fluid, and the resulting loss of energy from the bubble, can be incorporated into the simple spherical bubble model with the addition of a single extra ordinary differential equation. The numerical results show that for a bubble close to an infiniterigid boundary there are significant differences in both the radius and Kelvin impulse of the bubble when the heat transfer effects are included.
Classification Theorems For The C*Algebras Of Graphs With Sinks, Iain Raeburn, Mark Tomforde, Dana Williams
Classification Theorems For The C*Algebras Of Graphs With Sinks, Iain Raeburn, Mark Tomforde, Dana Williams
Faculty of Engineering and Information Sciences  Papers: Part A
We consider graphs E which have been obtained by adding one or more sinks to a fixed directed graph G. We classify the C^{*}algebra of E up to a very strong equivalence relation, which insists, loosely speaking, that C^{*}(G) is kept fixed. The main invariants are vectors W_{E}: G^{0} → which describe how the sinks are attached to G; more precisely, the invariants are the classes of the W_{E} in the cokernel of the map A – I, where A is the adjacency matrix of the graph G.
Reliability Of Higher Seeding Rates Of Wheat For Increased Competitiveness With Weeds In Low Rainfall Environments, D Lemerle, R D. Cousens, G S. Gill, S J. Peltzer, M Moerkerk, C E. Murphy, D Collins, Brian R. Cullis
Reliability Of Higher Seeding Rates Of Wheat For Increased Competitiveness With Weeds In Low Rainfall Environments, D Lemerle, R D. Cousens, G S. Gill, S J. Peltzer, M Moerkerk, C E. Murphy, D Collins, Brian R. Cullis
Faculty of Engineering and Information Sciences  Papers: Part A
Increasing crop competitiveness using higher seeding rates is a possible technique for weed management in low input and organic farming systems or when herbicide resistance develops in weeds. A range of wheat seeding rates were sown and resulted in crop densities between 50–400 plants/m^{2} (current recommendations are 100–150 plants/m^{2}) in the presence and absence of annual ryegrass (Lolium rigidum Gaud.) in three wheat cultivars at nine experiments in southern Australia. Wheat densities of at least 200 plants/m^{2} were required to suppress L. rigidum and to a lesser extent increase crop yield across ...
Summability For Nonunital Spectral Triples, Adam C. Rennie
Summability For Nonunital Spectral Triples, Adam C. Rennie
Faculty of Engineering and Information Sciences  Papers: Part A
This paper examines the issue of summability for spectral triples for the class of nonunital algebras. For the case of (p, ) summability, we prove that the Dixmier trace can be used to define a (semifinite) trace on the algebra of the spectral triple. We show this trace is wellbehaved, and provide a criteria for measurability of an operator in terms of zeta functions. We also show that all our hypotheses are satisfied by spectral triples arising from eodesically complete Riemannian manifolds. In addition, we indicate how the Local Index Theorem of ConnesMoscovici extends to our nonunital setting.
Dynamic Properties And Liquefaction Behavior Of Granular Materials Using Discrete Element Method, S V. Dinesh, T G. Sitharam, J S Vinod
Dynamic Properties And Liquefaction Behavior Of Granular Materials Using Discrete Element Method, S V. Dinesh, T G. Sitharam, J S Vinod
Faculty of Engineering and Information Sciences  Papers: Part A
Dynamic properties of the soil such as shear modulus and damping ratio are important parameters in the prediction of the dynamic response of geotechnical engineering structures. Though these properties are dependent on several factors, strain amplitude and confining pressure have a major effect. Liquefaction is another important phenomenon associated with the undrained response of granular materials in loose state. In this paper, the results of the numerical simulation of cyclic triaxial shear tests on threedimensional assembly consisting of 1000 sphere particles using Discrete Element Method (DEM) have been reported under undrained conditions. From the results, the shear modulus and damping ...
Placement And Penetration Of Distributed Generation Under Standard Market Design, Ashish Agalgaonkar, S V. Kulkarni, S A. Khaparde, S A. Soman
Placement And Penetration Of Distributed Generation Under Standard Market Design, Ashish Agalgaonkar, S V. Kulkarni, S A. Khaparde, S A. Soman
Faculty of Engineering and Information Sciences  Papers: Part A
Distributed Generation (DG) can help in reducing the cost of electricity to the costumer, relieve network congestion and provide environmentally friendly energy close to load centers. Its capacity is also scalable and it provides voltage support at distribution level. Hence, DG placement and penetration level is an important problem for both the utility and DG owner. The cost of electricity as a commodity depends upon market model. The restructured power markets are slowly maturing with standardizations like Standard Market Design (SMD). The key feature of SMD is the Locational Marginal Pricing (LMP) scheme. This paper examines placement and penetration level ...
Study On The Mechanism Of The SqueezeStrengthen Effect In Magnetorheological Fluids, Xianzhou Zhang, X L. Gong, P Q. Zhang, Q M. Wang
Study On The Mechanism Of The SqueezeStrengthen Effect In Magnetorheological Fluids, Xianzhou Zhang, X L. Gong, P Q. Zhang, Q M. Wang
Faculty of Engineering and Information Sciences  Papers: Part A
Current magnetorheological (MR)fluids have the limitation that their yield stresses are not strong enough to meet some industrial requirements. X. Tang, X. Zhang, and R. Tao [J. App. Phys87, 2634 (2000)] proposed a method to achieve highefficiency MR fluids by study of squeezestrengthen effect. But there is little report on its mechanism. This paper aims to investigate this effect through experimental and theoretical approaches. For this purpose, an apparatus is designed to experimentally study the mechanism of this squeezestrengthen effect. Taking account of a modified magnetic dipole model and the friction effect, a semiempirical model is proposed to explain ...
Smoothing With Mixed Model Software, Long Ngo, M P. Wand
Smoothing With Mixed Model Software, Long Ngo, M P. Wand
Faculty of Engineering and Information Sciences  Papers: Part A
Smoothing methods that use basis functions with penalization can be formulated as fits in a mixed model framework. One of the major benefits is that software for mixed model analysis can be used for smoothing. We illustrate this for several smoothing models such as additive and varying coefficient models for both SPLUS and SAS software. Code for each of the illustrations is available on the Internet.
Effect Of Aging And Deformation On The Microstructure And Properties Of FeNiTi Maraging Steel, A Shekhter, H I. Aaronson, M K. Miller, S P. Ringer, E V. Pereloma
Effect Of Aging And Deformation On The Microstructure And Properties Of FeNiTi Maraging Steel, A Shekhter, H I. Aaronson, M K. Miller, S P. Ringer, E V. Pereloma
Faculty of Engineering and Information Sciences  Papers: Part A
The agehardening behavior of Fe−25.3Ni−1.7 Ti (wt pct) alloy both in undeformed specimens and in specimens cold deformed by 10 or 20 pct prior to aging was studied. The microstructural changes during aging were observed using transmission electron microscopy (TEM) and atom probe analysis and there were related to the mechanical properties as measured by microhardness and shear punch testing. An excellent combination of hardness, strength, and ductility was achieved after only 5 seconds aging at 550°C. We propose that this rapid strengthening is due to a dislocation friction effect arising from the formation of ...
Effect Of Microstructure On The Stability Of Retained Austenite In TransformationInducedPlasiticity Steels, I B. Timokhina, P D. Hodgson, E V. Pereloma
Effect Of Microstructure On The Stability Of Retained Austenite In TransformationInducedPlasiticity Steels, I B. Timokhina, P D. Hodgson, E V. Pereloma
Faculty of Engineering and Information Sciences  Papers: Part A
Two Fe0.2C1.55Mn1.5Si (in wt pct) steels, with and without the addition of 0.039Nb (in wt pct), were studied using laboratory rollingmill simulations of controlled thermomechanical processing. The microstructures of all samples were characterized by optical metallography, Xray diffraction (XRD), and transmission electron microscopy (TEM). The microstructural behavior of phases under applied strain was studied using a heattinting technique. Despite the similarity in the microstructures of the two steels (equal amounts of polygonal ferrite, carbidefree bainite, and retained austenite), the mechanical properties were different. The mechanical properties of these transformationinducedplasticity (TRIP) steels depended not only on the ...
Widmanstatten Ferrite Plate Formation In LowCarbon Steels, Dominic Phelan, Rian Dippenaar
Widmanstatten Ferrite Plate Formation In LowCarbon Steels, Dominic Phelan, Rian Dippenaar
Faculty of Engineering and Information Sciences  Papers: Part A
The mechanism by which Widmanstätten ferrite plates nucleate and grow in lowcarbon steels has been studied. Insitu laser scanning confocal microscopy (LSCM) observations, optical microscopy, and electron backscattered diffraction (EBSD) techniques have been used to characterize the relationship between grain boundary allotriomorphs and Widmanstätten ferrite plates. The issue of where Widmanstätten ferrite plates nucleate is one of some debate, with theories including morphological instability and sympathetic nucleation. Evidence has been found that supports the theory of a sympathetic nucleation mechanism being responsible for the formation of Widmanstätten ferrite plates. The EBSD measurements have shown that lowangle misorientations of between 5 ...
Role Of Cr And P Additions In The Development Of Microstructure And Texture In Annealed Low Carbon Steels, E V. Pereloma, I B. Timokhina, A I. Nosenkov, J J. Jonas
Role Of Cr And P Additions In The Development Of Microstructure And Texture In Annealed Low Carbon Steels, E V. Pereloma, I B. Timokhina, A I. Nosenkov, J J. Jonas
Faculty of Engineering and Information Sciences  Papers: Part A
The recrystallisation behaviour of four warm rolled steels was investigated during annealing. The extralow carbon (ELC) steel displayed the highest rate of recrystallisation, the steels with additions of chromium and phosphorus (LC(Cr)), (LC(Cr,P)) recrystallised at intermediate rates, while the interstitialfree (IF) steel exhibited the lowest rate. The additions of Cr and Cr/P increased the fraction of gfibre in the annealing textures compared to that present in the ELC steel; this effect was particularly pronounced up to 50 % recrystallisation. After the completion of recrystallisation, the steel textures were characterized by a dominant gfibre in the IF steel ...
Massive Increase In The Stiffness Of The Human Lens Nucleus With Age: The Basis For Presbyopia?, Karl Robert Heys, Sandra Leigh Cram, Roger J W Truscott
Massive Increase In The Stiffness Of The Human Lens Nucleus With Age: The Basis For Presbyopia?, Karl Robert Heys, Sandra Leigh Cram, Roger J W Truscott
Faculty of Engineering and Information Sciences  Papers: Part A
Purpose: To determine the stiffness of different regions of human lenses as a function of age, and to correlate the biophysical measurements in the lens center with nuclear water content.
Methods: A custom made probe fitted to a dynamic mechanical analyzer was employed to measure stiffness values at 1 mm increments across equatorial sections of individual human lenses. Thermogravimetric analysis was used to determine the percentage water content in the nuclei of human lenses.
Results: There was a pronounced increase in lens stiffness over the age range from 14 to 78. In the nucleus, stiffness values varied almost 1,000 ...
On A Heat Problem Involving The Perturbed HardySobolev Operator, Nirmalendu Chaudhuri, Kunnath Sandeep
On A Heat Problem Involving The Perturbed HardySobolev Operator, Nirmalendu Chaudhuri, Kunnath Sandeep
Faculty of Engineering and Information Sciences  Papers: Part A
No abstract provided.
Mansfield's Imprimitivity Theorem For Arbitrary Closed Subgroups, Astrid An Huef, Iain Raeburn
Mansfield's Imprimitivity Theorem For Arbitrary Closed Subgroups, Astrid An Huef, Iain Raeburn
Faculty of Engineering and Information Sciences  Papers: Part A
No abstract provided.
CuntzKrieger Algebras Of Infinite Graphs And Matrices, Iain Raeburn, Wojciech Szymanski
CuntzKrieger Algebras Of Infinite Graphs And Matrices, Iain Raeburn, Wojciech Szymanski
Faculty of Engineering and Information Sciences  Papers: Part A
We show that the CuntzKrieger algebras of infinite graphs and infinite {0,1}matrices can be approximated by those of finite graphs. We then use these approximations to deduce the main uniqueness theorems for CuntzKrieger algebras and to compute their Ktheory. Since the finite approximating graphs have sinks, we have to calculate the Ktheory of CuntzKrieger algebras of graphs with sinks, and the direct methods we use to do this should be of independent interest.
Estimation Of Diffusion Coefficients, Lateral Shear Stress, And Velocity In Open Channels With Complex Geometry, ShuQing Yang, JianXing Yu, YuanZhan Wang
Estimation Of Diffusion Coefficients, Lateral Shear Stress, And Velocity In Open Channels With Complex Geometry, ShuQing Yang, JianXing Yu, YuanZhan Wang
Faculty of Engineering and Information Sciences  Papers: Part A
The lateral distributions of depthaveraged apparent shear stress, depth mean velocity, and diffusion coefficients are essential in certain quantitative analysis for sediment transport and environmental studies. An analytical method for the computation of these parameters is presented. A mathematical relationship between these parameters, based on the concept of surplus energy transport through a minimum relative distance developed by Yang and Lim [1997], is established, the depthaveraged apparent shear stress is determined from the boundary shear stress, depth mean velocity is obtained by considering the influence of nonuniform shear velocity and the free surface in 3D channels, and the diffusion coefficients ...
A Systematic Study Of RadioInduced XRay Cavities In Clusters, Groups, And Galaxies, L Birzan, D A. Rafferty, B R. Mcnamara, M W. Wise, Paul E. J Nulsen
A Systematic Study Of RadioInduced XRay Cavities In Clusters, Groups, And Galaxies, L Birzan, D A. Rafferty, B R. Mcnamara, M W. Wise, Paul E. J Nulsen
Faculty of Engineering and Information Sciences  Papers: Part A
We present an analysis of 16 galaxy clusters, one group, and one galaxy drawn from the Chandra Data Archive. These systems possess prominent Xray surface brightness depressions associated with cavities or bubbles that were created by interactions between powerful radio sources and the surrounding hot gas. The central galaxies in these systems harbor radio sources with luminosities ranging between ∼2 × 10 38 and 7 × 10 44 ergs s 1. The cavities have an average radius of ∼10 kpc, and they lie at an average projected distance of ∼20 kpc from the central galaxy. The minimum energy associated with the cavities ...