Spherical, Cylindrical And Tetrahedral Symmetries; Hydrogenic States At High Magnetic Field In Si:P,
2013
University of Wollongong
Spherical, Cylindrical And Tetrahedral Symmetries; Hydrogenic States At High Magnetic Field In Si:P, R A. Lewis, A Bruno-Alfonso, G V B De Souza, R E M Vickers, J A Colla, E Constable
Faculty of Engineering and Information Sciences - Papers: Part A
Phosphorous donors in silicon have an electronic structure that mimics the hydrogen atom, albeit on a larger length, smaller energy and smaller magnetic field scale. While the hydrogen atom is spherically symmetric, an applied magnetic field imposes cylindrical symmetry, and the solid-state analogue involves, in addition, the symmetry of the Si crystal. For one magnetic field direction, all six conduction-band valleys of Si:P become equivalent. New experimental data to high laboratory fields (30 T), supported by new calculations, demonstrate that this high symmetry field orientation allows the most direct comparison with free hydrogen.
Facile Synthesis Of Hierarchical Networks Composed Of Highly Interconnected V2o5 Nanosheets Assembled On Carbon Nanotubes And Their Superior Lithium Storage Properties,
2013
University of Wollongong
Facile Synthesis Of Hierarchical Networks Composed Of Highly Interconnected V2o5 Nanosheets Assembled On Carbon Nanotubes And Their Superior Lithium Storage Properties, Ruixiang Yu, Chaofeng Zhang, Qing Meng, Zhixin Chen, Hua-Kun Liu, Zaiping Guo
Faculty of Engineering and Information Sciences - Papers: Part A
Hierarchical networks with highly interconnected V2O5 nanosheets (NSs) anchored on skeletons of carbon nanotubes (CNTs) are prepared by a facile hydrothermal treatment and a following calcination for the first time. Benefiting from these unique structural features, the as-prepared CNT@V2O5 material shows dramatically excellent electrochemical performance with remarkable long cyclability (137-116 mA h g-1 after 400 cycles) at various high rates (20 C to 30 C) and very good rate capability for highly reversible lithium storage. The excellent electrochemical performance suggests its promising use as a cathode material for future lithium-ion batteries.
Energy Loss Rate Of A Charged Particle In Hgte/(Hgte, Cdte) Quantum Wells,
2013
University of Wollongong
Energy Loss Rate Of A Charged Particle In Hgte/(Hgte, Cdte) Quantum Wells, Qinjun Chen, Yee Sin Ang, Xiaolin Wang, R A. Lewis, Chao Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
The energy loss rate (ELR) of a charged particle in a HgTe/(HgTe, CdTe) quantum well is investigated. We consider scattering of a charged particle by the bulk insulating states in this type of topological insulator. It is found that the ELR characteristics due to the intraband excitation have a linear energy dependence while those due to interband excitation depend on the energy exponentially. An interesting quantitative result is that for a large range of the incident energy, the mean inelastic scattering rate is around a few terahertz.
Polypyrrole-Coated Α-Lifeo2 Nanocomposite With Enhanced Electrochemical Properties For Lithium-Ion Batteries,
2013
University of Wollongong
Polypyrrole-Coated Α-Lifeo2 Nanocomposite With Enhanced Electrochemical Properties For Lithium-Ion Batteries, Zhi-Jia Zhang, Jia-Zhao Wang, Shulei Chou, Hua-Kun Liu, Kiyoshi Ozawa, Hui-Jun Li
Faculty of Engineering and Information Sciences - Papers: Part A
A conducting alpha-LiFeO2-polypyrrole (alpha-LiFeO2-PPy) nanocomposite material was prepared by the chemical polymerization method as a cathode material for lithium-ion batteries. The porous alpha-LiFeO2 was prepared via the microwave hydrothermal method and a post-annealing. The X-ray diffraction, Fourier transform infrared spectroscopy, and field emission scanning electron microscopy measurements showed that the alpha-LiFeO2 nanoparticles were coated with PPy. The polypyrrole coating improves the reversible capacity and cycling stability (104 mAh g(-1) at 0.1C after 100 cycles) for lithium-ion batteries. Even at the high rate of 10C, the electrode showed more than 40% of the capacity at low rate (0.1C).
Inter-Organisational Knowledge Sharing In Regional Sustainable Development Communities,
2013
University of Wollongong
Inter-Organisational Knowledge Sharing In Regional Sustainable Development Communities, Rosemary Van Der Meer, Luba Torlina, Jamie Mustard
Faculty of Engineering and Information Sciences - Papers: Part A
There has been an increasing interest in the use of inter-organisational groups to address regional implications in sustainable development. These groups bring together local knowledge and expertise and span boundaries between government and industry organisations. Our focus is in understanding how knowledge is shared in such inter-organisational groups. Utilising interviews, observations and social network analysis, we examine the knowledge sharing implications derived from the mixed membership, multilevel interaction, and the need to span boundaries with external organisations in these collaborations.
Online In Vivo Dosimetry In High Dose Rate Prostate Brchytherapy With Moskin Detectors: In Phantom Feasibility Study,
2013
Universita degli Studi di Milano-Bicocca
Online In Vivo Dosimetry In High Dose Rate Prostate Brchytherapy With Moskin Detectors: In Phantom Feasibility Study, G Gambarini, M Carrara, C Tenconi, N Mantaut, M Borroni, D Cutajar, M Petasecca, I Fuduli, M Lerch, E Pignoli, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
MOSkin detectors were studied to perform real-time in vivo dose measurements in high dose rate prostate brachytherapy. Measurements were performed inside an urethral catheter in a gel phantom simulating a real prostate implant. Measured and expected doses were compared and the discrepancy was found to be within 8.9% and 3.8% for single MOSkin and dual-MOSkin configurations, respectively. Results show that dual-MOSkin detectors can be profitably adopted in prostate brachytherapy treatments to perform real-time in vivo dosimetry inside the urethra.
Graphene-Polymer Multilayer Heterostructure For Terahertz Metamaterials,
2013
Monash University
Graphene-Polymer Multilayer Heterostructure For Terahertz Metamaterials, Zaiquan Xu, Caiyun Chen, Steve Qing Yang Wu, Bing Wang, Jinghua Teng, Chao Zhang, Qiaoliang Bao
Faculty of Engineering and Information Sciences - Papers: Part A
The optical response and plasmon coupling between graphene sheets for graphene/polymer multilayer heterostructures with controlled separation were systematically investigated. Anomalous transmission of light was experimentally observed in mid-infrared range. The position of the broad passband in the transmission spectra was observed to red-shift with the increase of the number of layers.
Formulation Of Cross-Anisotropic Failure Criterion For Soils,
2013
University of Wollongong
Formulation Of Cross-Anisotropic Failure Criterion For Soils, Yi-Fei Sun, Han-Long Liu, Gui Yang, Yang Xiao
Faculty of Engineering and Information Sciences - Papers: Part A
Inherently anisotropic soil fabric has a considerable influence on soil strength. To model this kind of inherent anisotropy, a three-dimensional anisotropic failure criterion was proposed, employing a scalar-valued anisotropic variable and a modified general threedimensional isotropic failure criterion. The scalar-valued anisotropic variable in all sectors of the deviatoric plane was defined by correlating a normalized stress tensor with a normalized fabric tensor. Detailed comparison between the available experimental data and the corresponding model predictions in the deviatoric plane was conducted. The proposed failure criterion was shown to well predict the failure behavior in all sectors, especially in sector II with …
A Simple Model To Extend 1-D Hydraulics To 3-D Hydraulics,
2013
University of Wollongong
A Simple Model To Extend 1-D Hydraulics To 3-D Hydraulics, Shu-Qing Yang
Faculty of Engineering and Information Sciences - Papers: Part A
the core of fluid mechanics is the study of friction on a solid/liquid interface, the friction force can be divided into skin friction and form drag. Nikuradse's experiments reveal that the friction factor depends on the Reynolds number (Re) and relative roughness (r), this observation implies the co-existence of skin friction and form drag, but the definitions of Re and r given by Nikuradse cannot be linked with the skin friction and form drag, this leads to the invalidity of existing theory to predict the friction factor in a complex flow, like a channel flow with vegetation. To establish a …
Why Cannot Sediment Transport Be Accurately Predicted,
2013
University of Wollongong
Why Cannot Sediment Transport Be Accurately Predicted, Shu-Qing Yang
Faculty of Engineering and Information Sciences - Papers: Part A
Sediment transport is a geophysical phenomenon that sediment particles are driven to move in streamwise and vertical directions by the corresponding forces. Almost all existing formulae of sediment transport were derived based on the assumption that sediment transport can be fully expressed by streamwise parameters like velocity or boundary shear stress etc., whilst the vertical parameters are not included, like the variation of water depth (pressure) over time and space, vertical velocity or seepage. This paper investigates the effect of vertical motion on sediment transport, it was found that the vertical motion can be well represented by a vertical velocity …
Faster Out Of The Station: Asia Surges Ahead On Rail,
2013
University of Wollongong
Faster Out Of The Station: Asia Surges Ahead On Rail, Philip G. Laird
Faculty of Engineering and Information Sciences - Papers: Part A
It is interesting to see the progressmade by Asian countries since 2001 in developing high-speed rail (HSR),while Australia is missing out.
The Asian Evolution Of High Speed Rail,
2013
University of Wollongong
The Asian Evolution Of High Speed Rail, Philip G. Laird
Faculty of Engineering and Information Sciences - Papers: Part A
In Australia, in 2001, the Howard government released an East Coast HSR Scoping Study. This followed two major investigations by the private sector into HSR options for Australia; the first being a Sydney Canberra Melbourne Very Fast Train as proposed in 1984 by CSIRO, and the second being the Sydney Canberra Speed HSR proposal.
Impact Of The Mlc On The Mri Field Distortion Of A Prototype Mri-Linac,
2013
The University of Sydney
Impact Of The Mlc On The Mri Field Distortion Of A Prototype Mri-Linac, Stefan Kolling, Brad Oborn, Paul Keall
Faculty of Engineering and Information Sciences - Papers: Part A
Purpose: To cope with intrafraction tumor motion, integrated MRI-linac systems for real-time image guidance are currently under development. The multileaf collimator (MLC) is a key component in every state-of-the-art radiotherapy treatment system, allowing for accurate field shaping and tumor tracking. This work quantifies the magnetic impact of a widely used MLC on the MRI field homogeneity for such a modality. Methods: Results: Conclusions: This work shows that the MRI field distortions caused by the MLC cannot be ignored and must be thoroughly investigated for any MRI-linac system. The numeric distortion values obtained for our1.0T magnet may vary for other magnet …
New Approach To Improve The Accuracy Of 3-D Shape Measurement Of Moving Object Using Phase Shifting Profilometry,
2013
University of Wollongong
New Approach To Improve The Accuracy Of 3-D Shape Measurement Of Moving Object Using Phase Shifting Profilometry, Lei Lu, Jiangtao Xi, Yanguang Yu, Qinghua Guo
Faculty of Engineering and Information Sciences - Papers: Part A
When phase shifting profilometry (PSP) is emplyed for 3-D shape measurement, the object must be kept static during the projection and acquisition of the multiple fringe patterns. Errors will occur when the object moves and if the projection and capture of fringe patterns are not fast enough. In this paper, a new approach is proposed to tackle the problem, consisting of two steps. Firstly, the rotation matrix and translation vector describing the movement of the object are estimated using a set of marks placing on the surface of the object. Then the expressions of the fringe patterns under the influence …
Curvature Flows And Barriers In Fire Front Modelling,
2013
University of Wollongong
Curvature Flows And Barriers In Fire Front Modelling, Valentina-Mira Wheeler, James A. Mccoy, Glen Wheeler, J J. Sharples
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper we propose a novel mathematical model for describing the evolution of a fire front. Specifically, for a homogeneous fuel bed of varying height with constant ignition temperature Tig we model the isosurface corresponding to Tig . The intersection of this isosurface with the fuel bed defines the evolving front. There are three natural processes driving the evolution of the evolving front: radiative heat transfer, convective heat transfer, and heat/mass transfer. These processes clearly depend on the shape of the isosurface in space, and this nonlinear feedback can be understood through the curvature of the isosurface. The model …
Video Resources For Supporting Learning In Mathematics Rich Disciplines: A Teaching Perspective,
2013
University of Wollongong
Video Resources For Supporting Learning In Mathematics Rich Disciplines: A Teaching Perspective, Bothaina Bukhatwa, Anne L. Porter, Mark I. Nelson
Faculty of Engineering and Information Sciences - Papers: Part A
Video capture technology allows video to be readily recorded and edited. The distribution of videos through e-learning systems provides learning support to students. This article discusses our experiences in developing video genre resources. The "overview" video resource is found to be a useful technique for conveying the structure of a topic. Video resources can be combined in a variety of ways using concept maps, learning design maps and/or folder based approaches. We provide our perspective regarding the productio nof video resources using tablet technology tools. The relative ease and flexibility of the technology is discussed. The aim of this article …
Modelling Fire Line Merging Using Plane Curature Flow,
2013
UNSW
Modelling Fire Line Merging Using Plane Curature Flow, J J. Sharples, I N. Towers, G Wheeler, Valentina-Mira Wheeler, J A. Mccoy
Faculty of Engineering and Information Sciences - Papers: Part A
The merging of two lines of fire is a relatively common occurrence in landscape fire events. For example, it can arise through the coalescence of two wildfires or when a prescribed fire meets a wildfire as part of suppression efforts. When two fires approach one another, the effects of convective and radiative heat transfer are compounded and high rates of spread can arise as a result. This is particularly the case when two oblique lines of fire meet at some acute angle - the point of intersection on the newly merged fire can advance rapidly. This case was investigated recently …
Performance Evaluation Of Bioethanol Production Through Continuous Fermentation With A Settling Unit,
2013
University of Wollongong
Performance Evaluation Of Bioethanol Production Through Continuous Fermentation With A Settling Unit, Mark I. Nelson, Norhayati Hamzah
Faculty of Engineering and Information Sciences - Papers: Part A
This paper analyses a model for the production of bioethanol that has been calibrated against laboratory data by previous researchers. The authors investigate the improvement in productivity that can be obtained when a centrifuge is used to recycle cells that would otherwise leave the reactor system in the efficient stream. The authors compare the performance of a double reactor cascade, possible employing a settling unit, against that of a single reactor. For the former case, this paper considers the reactor configuration in which the settling unit recycles from the effluent stream of a reactor back in the influent of the …
Cross-Section Calculations For Positron Scattering From Pyrimidine Over An Energy Range From 0.1 To 10000 Ev,
2013
Consejo Superior De Investigaciones Cientificas
Cross-Section Calculations For Positron Scattering From Pyrimidine Over An Energy Range From 0.1 To 10000 Ev, A G. Sanz, M C. Fuss, F Blanco, Z Masin, J D. Gorfinkiel, R P. Mceachran, M J. Brunger, G Garcia
Faculty of Engineering and Information Sciences - Papers: Part A
We report a computational investigation of positron scattering by pyrimidine (C4H4N2) in the gas phase. Integral and differential cross sections have been calculated over a broad energy range by employing two distinct ab initio quantum scattering methods: the R-matrix method and a corrected form of the independent-atom representation, at low and high energies, respectively. Since pyrimidine is a strong polar molecule further dipole-induced excitations have been calculated in the framework of the first Born approximation. Good agreement is found between the different computational models and fair agreement is found with prior experimental results.
A Secure And Effective Anonymous User Authentication Scheme For Roaming Service In Global Mobility Networks,
2013
University of Wollongong
A Secure And Effective Anonymous User Authentication Scheme For Roaming Service In Global Mobility Networks, Fentong Wen, Willy Susilo, Guomin Yang
Faculty of Engineering and Information Sciences - Papers: Part A
In global mobility networks, anonymous user authentication is an essential task for enabling roaming service. In a recent paper, Jiang et al. proposed a smart card based anonymous user authentication scheme for roaming service in global mobility networks. This scheme can protect user privacy and is believed to have many abilities to resist a range of network attacks, even if the secret information stored in the smart card is compromised. In this paper, we analyze the security of Jiang et al.'s scheme, and show that the scheme is in fact insecure against the stolen-verifier attack and replay attack. Then, we …
