Cyclotron Electron Beam Excited Surface Plasmon Polaritons Coherent Radiation, 2015 Cooperative Innovation Centre Of Terahertz Science, University of Electronic Science and Technology of China
Cyclotron Electron Beam Excited Surface Plasmon Polaritons Coherent Radiation, Sen Gong, Tao Zhao, Min Hu, Renbin Zhong, Xiaoxing Chen, Diwei Liu, Ping Zhang, C Zhang, Jian Chen, Biaobin Jin, Huabing Wang, Peiheng Wu, Shenggang Liu
Faculty of Engineering and Information Sciences - Papers: Part A
A physical mechanism of electron beam excitation of surface plasmon polaritons (SPPs) on the circular cylindrical structure and transformation into coherent radiation is proposed. Here SPPs on the circular cylindrical structures are excited by a cyclotron electron beam (CEB) rather than by the linearly moving electron beam (LEB). This change leads to an essential consequence due to the natural periodicity of 2π in structure and CEB, and this dual natural periodicity makes the SPPs transformation possible and brings significant excellences. HEM hybrid modes and TM0n modes SPPs can be excited and propagate along a cyclotron trajectory together with the CEB …
Nonlinear Terahertz Response Of Hgte/Cdte Quantum Wells, 2015 Hunan University, Changsha, University of Wollongong
Nonlinear Terahertz Response Of Hgte/Cdte Quantum Wells, Qinjun Chen, Matthew Sanderson, C Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
2015 AIP Publishing LLC. Without breaking the topological order, HgTe/CdTe quantum wells can have two types of bulk band structure: direct gap type (type I) and indirect gap type (type II). We report that the strong nonlinear optical responses exist in both types of bulk states under a moderate electric field in the terahertz regime. Interestingly, for the type II band structure, the third order conductivity changes sign when chemical potentials lies below 10meV due to the significant response of the hole excitation close to the bottom of conduction band. Negative nonlinear conductivities suggest that HgTe/CdTe quantum wells can find …
Comparative Evaluation Of Modern Dosimetry Techniques Near Low- And High-Density Heterogeneities, 2015 Victoria University, British Columbia Cancer Agency-Vancouver Island Centre
Comparative Evaluation Of Modern Dosimetry Techniques Near Low- And High-Density Heterogeneities, Eyad A. Alhakeem, Sami Alshaikh, Anatoly B. Rosenfeld, Sergei F. Zavgorodni
Faculty of Engineering and Information Sciences - Papers: Part A
The purpose of this study is to compare performance of several dosimetric methods in heterogeneous phantoms irradiated by 6 and 18 MV beams. Monte Carlo (MC) calculations were used, along with two versions of Acuros XB, anisotropic analytical algorithm (AAA), EBT2 film, and MOSkin dosimeters. Percent depth doses (PDD) were calculated and measured in three heterogeneous phantoms. The first two phantoms were a 30 x 30 x 30 cm3 solid-water slab that had an air-gap of 20x 2.5 x 2.35 cm3. The third phantom consisted of 30 x 30 x 5 cm3 solid water slabs, two 30 x 30 x …
Terahertz (6-15 Thz) Spectroscopy And Numerical Modelling Of Intermolecular Vibrations In Benzoic Acid And Its Derivatives, 2015 University of Wollongong
Terahertz (6-15 Thz) Spectroscopy And Numerical Modelling Of Intermolecular Vibrations In Benzoic Acid And Its Derivatives, Lucia Lepodise, Josip Horvat, R A. Lewis
Faculty of Engineering and Information Sciences - Papers: Part A
Terahertz spectroscopy of benzoic acid (BA) and two of its derivatives, 2-hydroxybenzoic acid (2OH-BA) and 3-hydroxybenzoic acid (3OH-BA), has been investigated in the spectral region 200 to 500 cm-1 (6.06 to 15.15 THz). The spectra show distinct absorption features. There is agreement between some of the absorption lines observed for these compounds, despite a shift in energy, which is attributed to the differences in the molecular structures. Numerical modelling gave corresponding absorption lines, and this helped in the assignment. Temperature dependence studies revealed that most of the absorption lines are composite lines in this frequency region.
Modeling Secondary Particle Tracks Generated By High-Energy Protons In Water, 2015 Universidad Complutense de Madrid
Modeling Secondary Particle Tracks Generated By High-Energy Protons In Water, Francisco Blanco, Antonio Munoz, Diego T. Almeida, F. Ferreira Da Silva, Paulo Limao-Vieira, Alexey Verkhovtsev, L Ellis-Gibbings, K Krupa, A Traore, G Garcia
Faculty of Engineering and Information Sciences - Papers: Part A
We present interaction probability data of low-energy secondary electrons and positrons produced due to the proton impact. The probability distribution functions serve as input data for the Low Energy Particle Track Simulation (LEPTS) approach which allows one to include the effect of low-energy species in medical applications of radiation and in ion-beam cancer therapy, in particular.
3d Bridge Microdosimeter: Charge Collection Study And Application To Rbe Studies In 12C Radiation Therapy, 2015 University of Wollongong
3d Bridge Microdosimeter: Charge Collection Study And Application To Rbe Studies In 12C Radiation Therapy, Linh T. Tran, Dale A. Prokopovich, Susanna Guatelli, Marco Petasecca, Michael L. F Lerch, Mark I. Reinhard, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
Radiotherapy using heavy ion beam such as Carbon-ion has the advantage for the treatment of deep-seated tumour over conventional radiotherapy with X-rays due to an enhanced dose deposition in the Bragg peak (BP) at the end of the ion range. The highest dose can be deposited in the tumour with much lower doses to the surrounding healthy tissue. The Relative Biological Effectiveness (RBE) of a carbon-ion radiotherapy beam greatly depends on a depth of the target volume in the body and the nuclear fragmentation process that increases close to the BP or spread out BP (SOBP) as well as neutrons. …
Mineral Precipitation And The Associated Reduction Of Hydraulic Conductivity In A Prb, 2015 University of Wollongong
Mineral Precipitation And The Associated Reduction Of Hydraulic Conductivity In A Prb, U Pathirage, B Indraratna
Faculty of Engineering and Information Sciences - Papers: Part A
Permeable reactive barriers (PRB) have been used worldwide for the in-situ treatment of con-taminated ground water. One such contamination found in Australia is acidic groundwater enriched with high concentrations of dissolved aluminium and iron produced in acid sulfate soil (ASS) terrains. To treat this acidi-ty in groundwater, a PRB was installed in the Shoalhaven Floodplain and then monitored over a seven year pe-riod. This remediation process was satisfactory but there was a small decrease in efficiency due to a secondary mineral precipitation (aluminium and iron oxy/hydroxides) which reduced the hydraulic conductivity of the PRB. Numerical modelling carried out through MODFLOW …
The Direct Shear Strength Of Sand-Tyre Shred Mixtures, 2015 University of Wollongong
The Direct Shear Strength Of Sand-Tyre Shred Mixtures, J S. Vinod, N Sheikh, D Mastello, B Indraratna, M S. Mashiri
Faculty of Engineering and Information Sciences - Papers: Part A
Waste tyres are currently being stockpiled in large quantities around the world causing adverse environmental impact. Significant research is currently underway to investigate possible options for the reuse of waste tyre, particularly in civil engineering applications. One such option is to utilise waste tyre (in the form of tyre shreds) and sand mixture as a lightweight fill material in infrastructure constructions. Utilising waste tyre in civil engineering projects has multiple benefits, including effective recycling of the waste tyre easing the strain on natural fills, reducing material costs and enhancing the geotechnical properties of the soil. Under-standing the shear and volume …
Performance Of Rail Ballast Stabilized With Resilient Rubber Pads Under Cyclic And Impact Loading, 2015 University of Wollongong
Performance Of Rail Ballast Stabilized With Resilient Rubber Pads Under Cyclic And Impact Loading, S K. Navaratnarajah, B Indraratna, S Nimbalkar
Faculty of Engineering and Information Sciences - Papers: Part A
Although railroads are one of the most popular modes of transportation in countries such as Sri Lanka, Australia, and USA, their rapidly growing populations and increasing congestion in road transport has created severe challenges to the sustainability of rail transport infrastructure, which in turn increases the de-mand for high speed and heavy-haul trains. Ballast is the foundation material beneath concrete sleepers that provides key structural support against the high dynamic loading exerted by moving trains. However, the deg-radation of ballast seriously affects track stability and longevity. In recent years the use of resilient rubber pads has become increasingly popular. In …
A Particle-Breakage Critical State Model For Rockfill Material, 2015 University of Wollongong
A Particle-Breakage Critical State Model For Rockfill Material, Yang Xiao, Yifei Sun, Khairul Fikry Hanif
Faculty of Engineering and Information Sciences - Papers: Part A
Particle breakage has a significant influence on the stress-strain and strength behavior of rockfill material. A breakage critical state theory (BCST) was proposed to describe the evolution of particle breakage. The breakage critical state line in the breakage critical state theory was correlated with the breakage factor, which was fundamentally different from that of the original critical state theory. A simple elastoplastic constitutive model was developed for rockfill in the frame of BCST. An associated flow rule was adopted in this model. Isotropic, contractive and distortional hardening rules were suggested in view of the particle breakage. It was observed that …
Von Neumann Algebras Of Strongly Connected Higher-Rank Graphs, 2015 University of Wollongong
Von Neumann Algebras Of Strongly Connected Higher-Rank Graphs, Marcelo Laca, Nadia S. Larsen, Sergey Neshveyev, Aidan Sims, Samuel B. Webster
Faculty of Engineering and Information Sciences - Papers: Part A
We investigate the factor types of the extremal KMS states for the preferred dynamics on the Toeplitz algebra and the Cuntz-Krieger algebra of a strongly connected finite (Formula presented.)-graph. For inverse temperatures above 1, all of the extremal KMS states are of type (Formula presented.). At inverse temperature 1, there is a dichotomy: if the (Formula presented.)-graph is a simple (Formula presented.)-dimensional cycle, we obtain a finite type (Formula presented.) factor; otherwise we obtain a type III factor, whose Connes invariant we compute in terms of the spectral radii of the coordinate matrices and the degrees of cycles in the …
Expansion Of Co-Compact Convex Spacelike Hypersurfaces In Minkowski Space By Their Curvature, 2015 Australian National University
Expansion Of Co-Compact Convex Spacelike Hypersurfaces In Minkowski Space By Their Curvature, Ben H. Andrews, Xuzhong Chen, Hanlong Fang, James A. Mccoy
Faculty of Engineering and Information Sciences - Papers: Part A
We consider the expansion of co-compact convex hypersurfaces in Minkowski space by functions of their curvature, and prove under quite general conditions that solutions are asymptotic to the self-similar expanding hyperboloid. In particular this implies a convergence result for a class of special solution of the cross-curvature ow of negatively curved Riemannian metrics on three-manifolds.
Nonlinear Response Of Lateral Piles With Compatible Cap Stiffness And P-Multiplier, 2015 University of Wollongong
Nonlinear Response Of Lateral Piles With Compatible Cap Stiffness And P-Multiplier, Wei Dong Guo
Faculty of Engineering and Information Sciences - Papers: Part A
Response of lateral pile groups is modeled using the more accurate (than any other numerical modeling) p − y curves-based load transfer model. It is essentially underpinned by limiting force per unit length pmpu, modulus of subgrade reaction pmk, and p-multiplier pm (to cater for pile-pile interaction, pm ¼ 1 for single piles). With the model, new closed-form solutions are developed incorporating the cap-rotational stiffness kr. The solutions are presented in nondimensional charts for free-head (kr ¼ 0) through fixed-head (kr > 10 times the pile bending stiffness). The study reveals that the existing pm (bearing no link to the stiffness …
Lateral Cyclic Pile-Soil Interaction Studies On A Rigid Model Monopile, 2015 Zhejiang University
Lateral Cyclic Pile-Soil Interaction Studies On A Rigid Model Monopile, Ren-Peng Chen, Yong-Xin Sun, Bin Zhu, Wei Dong Guo
Faculty of Engineering and Information Sciences - Papers: Part A
The monopile foundation of an offshore wind turbine will unavoidably suffer from long-term cyclic loading during its lifetime, due to impacts from waves and wind. In this paper, a series of tests on a rigid model monopile, subjected to lateral cyclic loading, were carried out in Qiantang River silt to investigate the pile-soil interaction mechanism and accumulated deformation. The tests revealed that the accumulated displacement is closely related to the cyclic load ratio but has no obvious relationship with the relative density of the soil. In contrast, the unloading stiffness is independent of the cyclic ratio but is related to …
Nonlinear Response Of Laterally Loaded Rigid Piles In Sliding Soil, 2015 University of Wollongong
Nonlinear Response Of Laterally Loaded Rigid Piles In Sliding Soil, Wei Dong Guo
Faculty of Engineering and Information Sciences - Papers: Part A
This paper proposes a new, integrated two-layer model to capture nonlinear response of rotationally restrained laterally loaded rigid piles subjected to soil movement (sliding soil, or lateral spreading). First, typical pile response from model tests (using an inverse triangular loading profile) is presented, which includes profiles of ultimate on-pile force per unit length at typical sliding depths, and the evolution of pile deflection, rotation, and bending moment with soil movement. Second, a new model and closed-form expressions are developed for rotationally restrained passive piles in two-layer soil, subjected to various movement profiles. Third, the solutions are used to examine the …
Using Rasch Analysis To Explore What Students Learn About Probability Concept, 2015 Universiti Teknologi MARA
Using Rasch Analysis To Explore What Students Learn About Probability Concept, Zamalia Mahmud, Anne L. Porter
Faculty of Engineering and Information Sciences - Papers: Part A
Students’ understanding of probability concepts have been investigated from various different perspectives. This study was set out to investigate perceived understanding of probability concepts of forty-four students from the STAT131 Understanding Uncertainty and Variation course at the University of Wollongong, NSW. Rasch measurement which is based on a probabilistic model was used to identify concepts that students find easy, moderate and difficult to understand. Data were captured from the e-learning Moodle platform where students provided their responses through an on-line quiz. As illustrated in the Rasch map, 96% of the students could understand about sample space, simple events, mutually exclusive …
Multi-Phase Variety Trials Using Both Composite And Individual Replicate Samples: A Model-Based Design Approach, 2015 University of Wollongong
Multi-Phase Variety Trials Using Both Composite And Individual Replicate Samples: A Model-Based Design Approach, Alison B. Smith, David G. Butler, C R. Cavanagh, Brian R. Cullis
Faculty of Engineering and Information Sciences - Papers: Part A
The present paper provides an approach for the design and analysis of variety trials that are used to obtain quality trait data. These trials are multi-phase in nature, comprising a field phase followed by one or more laboratory phases. Typically the laboratory phases are costly relative to the field phase and this imposes a limit on the number of samples that can be tested. Historically, this has been achieved by sacrificing field replication, either by testing a single replicate plot for each variety or a single composite sample, obtained by combining material from several field replicates. An efficient statistical analysis …
Analysis Of A Chemostat Model With Variable Yield Coefficient And Substrate Inhibition: Contois Growth Kinetics, 2015 University of Wollongong
Analysis Of A Chemostat Model With Variable Yield Coefficient And Substrate Inhibition: Contois Growth Kinetics, Rubayyi Turki Alqahtani, Mark I. Nelson, Annette L. Worthy
Faculty of Engineering and Information Sciences - Papers: Part A
2015, Copyright Taylor & Francis Group, LLC. We analyze the steady-state operation of a generalized reactor model that encompasses a continuous flow bioreactor and an idealized continuous flow membrane reactor as limiting cases. The biochemical reaction kinetics is governed by a Contois growth model subject to noncompetitive substrate inhibition with a variable substrate yield coefficient. The steady-state performance of the reactor is predicted and stability of the steady-state solutions as a function of dimensionless residence time reported. Our results identified two cases of practical interest. The first feature corresponds to the case where solutions to both no-washout and washout conditions …
On The Question Of Effective Sample Size In Network Modeling: An Asymptotic Inquiry, 2015 University of Wollongong
On The Question Of Effective Sample Size In Network Modeling: An Asymptotic Inquiry, Pavel N. Krivitsky, Eric D. Kolaczyk
Faculty of Engineering and Information Sciences - Papers: Part A
The modeling and analysis of networks and network data has seen an explosion of interest in recent years and represents an exciting direction for potential growth in statistics. Despite the already substantial amount of work done in this area to date by researchers from various disciplines, however, there remain many questions of a decidedly foundational nature - natural analogues of standard questions already posed and addressed in more classical areas of statistics - that have yet to even be posed, much less addressed. Here we raise and consider one such question in connection with network modeling. Specifically, we ask, "Given …
Boundary Regularity Of The Solution To The Complex Monge-Ampère Equation On Pseudoconvex Domains Of Infinite Type, 2015 Vietnam National University
Boundary Regularity Of The Solution To The Complex Monge-Ampère Equation On Pseudoconvex Domains Of Infinite Type, Ly Kim Ha, Tran Vu Khanh
Faculty of Engineering and Information Sciences - Papers: Part A
All rights reserved. Let Ω be a C2-smooth, bounded, pseudoconvex domain in ℂn satisfying the "f -property". The f -property is a consequence of the geometric "type" of the boundary. All pseudoconvex domains of finite type satisfy the f-property as well as many classes of domains of infinite type. In this paper, we prove the existence, uniqueness, and "weak" Hölder-regularity up to the boundary of the solution to the Dirichlet problem for the complex Monge-Ampère equation (Formula Presented) The idea of our proof goes back to Bedford and Taylor [1]. However, the basic geometrical ingredient is based …