First Measurements With A Plastic Scintillation Dosimeter At The Australian Mri-Linac,
2019
University of Wollongong, Ingham Institute for Applied Medical Research
First Measurements With A Plastic Scintillation Dosimeter At The Australian Mri-Linac, Levi Madden, James Archer, Enbang Li, Urszula Jelen, Bin Dong, Natalia Roberts, Lois C. Holloway, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part B
MRI-LINACs combine MRI and LINAC technologies with the potential for image guided radiation therapy with optimal soft-tissue contrast. In this work, we present the advantages and limitations of plastic scintillation dosimeters (PSDs) for relative dosimetry with MRI-LINACs. PSDs possess many desirable qualities, including magnetic field insensitivity and irradiation angle independence, which are expected to make them suitable for dosimetry with MRI-LINACs. An in-house PSD was used to measure field size output factors as well as a percent depth dose distribution and the beam quality index TPR20/10 at a [Formula: see text] cm2 field size. Measurements were repeated with a Scanditronix/Wellhofer …
Eye State Recognition Method For Drivers With Glasses,
2019
Tianjin Polytechnic University
Eye State Recognition Method For Drivers With Glasses, Lei Geng, Haibing Yin, Zhitao Xiao, Jiangtao Xi
Faculty of Engineering and Information Sciences - Papers: Part B
Eye state recognition is a key step in fatigue detection method. However, factors such as occlusion of different types of glasses and changes in lighting conditions may have some impact on eye state recognition. In order to solve these problems, a driver's eye state recognition method based on deep learning is proposed. Firstly, the driver's face images are acquired using an infrared acquisition device. Secondly the multi-task cascaded convolution neural networks are used to detect the face bounding box and feature points of the driver's face image, and then the eye regions are extracted. Finally the Convolution Neural Network (CNN) …
A Gradient Flow For The P-Elastic Energy Defined On Closed Planar Curves,
2019
Tohoku University
A Gradient Flow For The P-Elastic Energy Defined On Closed Planar Curves, Shinya Okabe, Paola Pozzi, Glen Wheeler
Faculty of Engineering and Information Sciences - Papers: Part B
We study the evolution of closed inextensible planar curves under a second order flow that decreases the p-elastic energy. A short time existence result for p ∈ (1 , ∞) is obtained via a minimizing movements method. For p= 2, that is in the case of the classic elastic energy, long-time existence is retrieved.
Pricing Credit Default Swaps With Parisian And Parasian Default Mechanics,
2019
Jiangnan University
Pricing Credit Default Swaps With Parisian And Parasian Default Mechanics, Wenting Chen, Xinjiang He, Sha Lin
Faculty of Engineering and Information Sciences - Papers: Part B
This paper proposes Parisian and Parasian default mechanics for modeling the credit risks of the CDS (credit default swap) contracts. Unlike most of the structural models used in the literature, our new model assumes that the default will occur only if the price of the reference asset stays below a certain level for a pre-described period of time. To work out the corresponding CDS price, a general pricing formula containing the unknown no-default probability is derived first. It is then shown that the determination of such a probability is equivalent to the valuation of a Parisian or Parasian down-and-out binary …
Factorisation Of Equivariant Spectral Triples In Unbounded Kk-Theory,
2019
University of Wollongong, Leibniz University of Hannover, Australian National University
Factorisation Of Equivariant Spectral Triples In Unbounded Kk-Theory, Iain G. Forsyth, Adam C. Rennie
Faculty of Engineering and Information Sciences - Papers: Part B
We provide sufficient conditions to factorise an equivariant spectral triple as a Kasparov product of unbounded classes constructed from the group action on the algebra and from the fixed point spectral triple. We show that if factorisation occurs, then the equivariant index of the spectral triple vanishes. Our results are for the action of compact abelian Lie groups, and we demonstrate them with examples from manifolds and θ-deformations. In particular, we show that equivariant Dirac-type spectral triples on the total space of a torus principal bundle always factorise. Combining this with our index result yields a special case of the …
A Rigidity Theorem For Ideal Surfaces With Flat Boundary,
2019
University of Newcastle
A Rigidity Theorem For Ideal Surfaces With Flat Boundary, James A. Mccoy, Glen Wheeler
Faculty of Engineering and Information Sciences - Papers: Part B
We consider surfaces with boundary satisfying a sixth-order nonlinear elliptic partial differential equation corresponding to extremising the L2-norm of the gradient of the mean curvature. We show that such surfaces with small L2-norm of the second fundamental form and satisfying so-called flat boundary conditions are necessarily planar.
Development Of A Variable Stiffness Magnetorheological Damper With Self-Powered Generation Capability,
2019
University of Wollongong
Development Of A Variable Stiffness Magnetorheological Damper With Self-Powered Generation Capability, Xiaojing Zhu, Lei Deng, Shuaishuai Sun, Tianhong Yan, Jianqiang Yu, Zisu Ma, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part B
This article reports a compact stiffness controllable magnetorheological damper with a self-powered capacity. First, the structure, working mechanism, and analysis of the damper are presented. After the prototype of the magnetorheological damper, experimental tests were conducted to evaluate its variable stiffness feature and self-powered generation capability using a hydraulic Instron test system. The testing results demonstrate that its stiffness variation range can reach 70.4% when the applied current increases from 0 to 2 A. The energy generating capability of the magnetorheological damper was also evaluated using the Instron testing system under a harmonic excitation with 0.15 Hz frequency and 30 …
Effects Of Nano-Particle Lubrication On Micro Deep Drawing Of Mg-Li Alloy,
2019
University of Wollongong
Effects Of Nano-Particle Lubrication On Micro Deep Drawing Of Mg-Li Alloy, Hamidreza Kamali, Haibo Xie, Fanghui Jia, Hui Wu, Hongyang Zhao, Hongmei Zhang, Na Li, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
Effects of various lubrication conditions on macroscale deep drawing have been investigated extensively while in microscale due to the open and closed lubrication pocket theory and friction coefficient escalation, proper lubricant concern becomes severe. Microforming is used to produce lighter and more energy-effective products accordingly; in this study, magnesium-lithium (Mg-Li) alloy is chosen to form a superior micro-cup due to its ultralight weight with outstanding ductility. Mg-Li is a new material in microscale; consequently, to study the mechanical properties, a heat treatment process is performed. The dry and oil lubrication conditions are chosen as benchmarks to investigate effects of TiO …
Equilibrium States On Higher-Rank Toeplitz Non-Commutative Solenoids,
2019
University of Sydney
Equilibrium States On Higher-Rank Toeplitz Non-Commutative Solenoids, Zahra Afsar, Astrid An Huef, Iain F. Raeburn, Aidan Sims
Faculty of Engineering and Information Sciences - Papers: Part B
We consider a family of higher-dimensional non-commutative tori, which are twisted analogues of the algebras of continuous functions on ordinary tori and their Toeplitz extensions. Just as solenoids are inverse limits of tori, our Toeplitz non-commutative solenoids are direct limits of the Toeplitz extensions of non-commutative tori. We consider natural dynamics on these Toeplitz algebras, and we compute the equilibrium states for these dynamics. We find a large simplex of equilibrium states at each positive inverse temperature, parametrized by the probability measures on an (ordinary) solenoid.
Insight Into The Improved Cycling Stability Of Sphere-Nanorod-Like Micro-Nanostructured High Voltage Spinel Cathode For Lithium-Ion Batteries,
2019
University of Wollongong, Harbin Institute of Technology
Insight Into The Improved Cycling Stability Of Sphere-Nanorod-Like Micro-Nanostructured High Voltage Spinel Cathode For Lithium-Ion Batteries, Haiping Liu, Gemeng Liang, Chao Gao, Sifu Bi, Qiang Chen, Ying Xie, Shanshan Fan, Lixin Cao, Wei Kong Pang, Zaiping Guo
Faculty of Engineering and Information Sciences - Papers: Part B
Currently, developing cathode material with high energy density and good cycling performance is one of the key challenges for lithium-ion batteries. LiNi0.5-xMn1.5+xO4 (LNMO) spinel cathode has attracted great attention as the most promising cathode candidate due to its extraordinarily high operating voltage, but its inferior long-term cycling stability has limited its further development. In this work, we successfully designed LNMOs with specific facets and different morphologies, among which the hybrid sphere-nanorod-like micro-nanostructured LNMO possesses excellent cycling performance, with capacity of over 107.8 mAh g−1 after 1000 cycles at 10 C and superior rate capability …
A Review Of Heating, Ventilation And Air Conditioning Technologies And Innovations Used In Solar-Powered Net Zero Energy Solar Decathlon Houses,
2019
University of Wollongong
A Review Of Heating, Ventilation And Air Conditioning Technologies And Innovations Used In Solar-Powered Net Zero Energy Solar Decathlon Houses, Zhenjun Ma, Haoshan Ren, Wenye Lin
Faculty of Engineering and Information Sciences - Papers: Part B
Innovations in Heating, Ventilation, and Air Conditioning (HVAC) systems are continuously required to provide a better, healthier and more productive and sustainable built environment for building occupants with minimized energy or cost consumption. This paper provides an overview of the HVAC technologies and systems used in 212 solar-powered houses developed through 13 U.S. Department of Energy Solar Decathlon (SD) competitions. Some comments and discussions on the HVAC technologies and systems used in the SD competitions were also provided. The review was carried out based on the information available from the organizer's project reports and equipment summary, team project manuals, and …
A New Switched State Jump Observer For Traffic Density Estimation In Expressways Based On Hybrid-Dynamic-Traffic-Network-Model,
2019
Ministry of Transport
A New Switched State Jump Observer For Traffic Density Estimation In Expressways Based On Hybrid-Dynamic-Traffic-Network-Model, Wenbin Zha, Yuqi Guo, Huawei Wu, Miguel Sotelo, Yulin Ma, Qian Yi, Zhixiong Li, Xin Sun
Faculty of Engineering and Information Sciences - Papers: Part B
When faced with problems such as traffic state estimation, state prediction, and congestion identification for the expressway network, a novel switched observer design strategy with jump states is required to reconstruct the traffic scene more realistically. In this study, the expressway network is firstly modeled as the special discrete switched system, which is called the piecewise affine system model, a partition of state subspace is introduced, and the convex polytopes are utilized to describe the combination modes of cells. Secondly, based on the hybrid dynamic traffic network model, the corresponding switched observer (including state jumps) is designed. Furthermore, by applying …
Energy And Exergy Analysis Of A Desiccant Cooling System Integrated With Thermal Energy Storage And Photovoltaic/Thermal-Solar Air Collectors,
2019
University of Wollongong
Energy And Exergy Analysis Of A Desiccant Cooling System Integrated With Thermal Energy Storage And Photovoltaic/Thermal-Solar Air Collectors, Zhenjun Ma, Haoshan Ren, Zhongwei Sun
Faculty of Engineering and Information Sciences - Papers: Part B
This paper presents an energy and exergy analysis of a desiccant cooling system integrated with an air-based thermal energy storage (TES) unit using phase change materials (PCMs) and a photovoltaic/thermal-solar air collector (PV/T-SAC). The PV/T-SAC was used to generate thermal energy for desiccant wheel regeneration and space heating, and the TES was used to solve the mismatch between thermal energy supply and demand. The performance of this system was evaluated using a simulation system developed using TRNSYS. The effects of several key parameters on solar thermal contribution, specific net electricity generation, and the exergy destructions of individual components and overall …
A Magnetorheological Elastomer Rail Damper For Wideband Attenuation Of Rail Noise And Vibration,
2019
University of Wollongong, Tohoku University
A Magnetorheological Elastomer Rail Damper For Wideband Attenuation Of Rail Noise And Vibration, Shuaishuai Sun, Jian Yang, Tanju Yildirim, Donghong Ning, Xiaojing Zhu, Haiping Du, Shiwu Zhang, Masami Nakano, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part B
The noise and vibration effects of rails can have a significant impact on the environment surrounding the railways. Rail dampers are elements that are attached to the sides of the rail and can improve the track decay rate of rail and then enhance the rails' ability to attenuate noises and vibrations. However, in practical applications, the most efficient rail damper design still cannot adjust its own parameters to adapt to different requirements because their stiffness and damping are fixed after designed. In this work, a tunable magnetorheological elastomer rail damper that works on the principle of a dynamic vibration absorber …
Development And Evaluation Of A Highly Adaptive Mrf-Based Absorber With A Large Effective Frequency Range,
2019
University of Wollongong, University of Science and Technology of China
Development And Evaluation Of A Highly Adaptive Mrf-Based Absorber With A Large Effective Frequency Range, Jian Yang, Shuaishuai Sun, Donghong Ning, Zhixiong Li, Lei Deng, Matthew Christie, Haiping Du, S Zhang, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part B
This work developed an MRF-based absorber aiming at using the controllable storage modulus (stiffness) of MRF in its pre-yield region to achieve a wide natural frequency variation range. In the characterization test, its damping and stiffness properties in response to different amplitude and magnetic fields were explored. A sweep frequency test was then conducted to obtain the frequency shift property of the MRF absorber and the testing results demonstrate that its relative change rate of natural frequency is high up to 1986%. A mathematical model was built to predict the resonance shifting performance of the MRF absorber under different currents. …
Microencapsulation Of Paraffin With Poly (Urea Methacrylate) Shell For Solar Water Heater,
2019
Qilu University of Technology
Microencapsulation Of Paraffin With Poly (Urea Methacrylate) Shell For Solar Water Heater, Weiguang Su, Yilin Li, Tongyu Zhou, Jo Darkwa, Georgios Kokogiannakis, Zhao Li
Faculty of Engineering and Information Sciences - Papers: Part B
Previous research has demonstred that microencapsulated phase change materials (MEPCMs) could significantly increase the energy storage density of solar thermal energy storage (TES) systems. Compared with traditional phase change materials (PCMs), MEPCMs have many advantages since they can limit their exposure to the surrounding environment, enlarge the heat transfer area, and maintain the volume as the phase change occurs. In this study, a new MEPCM for solar TES systems is developed by encapsulation of paraffin wax with poly (urea formaldehyde) (PUF). The experimental results revealed that agglomeration of MEPCM particles occurred during the encapsulation process which affected the uniformity of …
Parameter Optimization Of Adaptive Flux-Weakening Strategy For Permanent-Magnet Synchronous Motor Drives Based On Particle Swarm Algorithm,
2019
Huazhong University of Science and Technology
Parameter Optimization Of Adaptive Flux-Weakening Strategy For Permanent-Magnet Synchronous Motor Drives Based On Particle Swarm Algorithm, Wei Xu, Moustafa Magdi Ismail, Yi Liu, Md Rabiul Islam
Faculty of Engineering and Information Sciences - Papers: Part B
Operating in the high-speed range is necessary for high-performance permanent-magnet synchronous motor (PMSM) drives. However, due to the back electromotive force effect, the PMSM is approaching the voltage limit at field decreasing scope. This paper presents a new flux-weakening scheme along with an improved vector control strategy to alleviate the influence of this problem. Control parameters of the anti-windup proportional and integral (AWPI) controller are optimized off-line in relying on an adaptive velocity particle swarm optimization (AVPSO) algorithm. The AVPSO algorithm considers the summation of AWPI measurement error which is the objective function of the optimization problem without knowing the …
Label Enhanced And Patch Based Deep Learning For Phase Retrieval From Single Frame Fringe Pattern In Fringe Projection 3d Measurement,
2019
Tianjin Polytechnic University
Label Enhanced And Patch Based Deep Learning For Phase Retrieval From Single Frame Fringe Pattern In Fringe Projection 3d Measurement, Jiashuo Shi, Xinjun Zhu, Hongyi Wang, Limei Song, Qinghua Guo
Faculty of Engineering and Information Sciences - Papers: Part B
We propose a label enhanced and patch based deep learning phase retrieval approach which can achieve fast and accurate phase retrieval using only several fringe patterns as training dataset. To the best of our knowledge, it is the first time that the advantages of the label enhancement and patch strategy for deep learning based phase retrieval are demonstrated in fringe projection. In the proposed method, the enhanced labeled data in training dataset is designed to learn the mapping between the input fringe pattern and the output enhanced fringe part of the deep neural network (DNN). Moreover, the training data is …
Modelling Of The Silicon-On-Insulator Microdosimeter Response Within The International Space Station For Astronauts' Radiation Protection,
2019
University of Wollongong
Modelling Of The Silicon-On-Insulator Microdosimeter Response Within The International Space Station For Astronauts' Radiation Protection, Stefania Peracchi, James Vohradsky, Susanna Guatelli, David Bolst, Linh T. Tran, Dale A. Prokopovich, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part B
Astronauts are exposed to high-energy cosmic radiation which may have harmful health effects. At the altitude of the International Space Station (ISS), the main radiation sources are Galactic Cosmic Rays (GCRs), Solar Particle Events (SPEs) and trapped protons of the Van Allen Belts. The radiation field mainly consists of protons, helium nuclei and heavy ions with energies up to hundreds of GeV/n. A powerful approach to determine the effect of space radiation on astronauts is microdosimetry. The Centre for Medical Radiation Physics is active in the development of Silicon-On-Insulator (SOI) microdosimeters, as an alternative to Tissue Equivalent Proportional Counters (TEPCs) …
Degradation Of Diclofenac, Trimethoprim, Carbamazepine, And Sulfamethoxazole By Laccase From Trametes Versicolor: Transformation Products And Toxicity Of Treated Effluent,
2019
Taibah University, University of Wollongong
Degradation Of Diclofenac, Trimethoprim, Carbamazepine, And Sulfamethoxazole By Laccase From Trametes Versicolor: Transformation Products And Toxicity Of Treated Effluent, Sultan Alharbi, Long D. Nghiem, Jason P. Van De Merwe, Frederic Leusch, Muhammad Bilal Asif, Faisal I. Hai, William E. Price
Faculty of Engineering and Information Sciences - Papers: Part B
The degradation of diclofenac (DCF), trimethoprim (TMP), carbamazepine (CBZ), and sulfamethoxazole (SMX) by laccase from Trametes versicolor was investigated. Experiments were conducted using the pharmaceuticals individually, or as a mixture at different initial concentrations (1.25 and 5 mg/L each). The initial enzymatic activity of all the treated samples was around 430-460 U (DMP) /L. The removal of the four selected pharmaceuticals tested individually was more effective than when tested in mixtures under the same conditions. For example, 5 mg DCF/L was completely removed to below its detection limit (1 µg/L) within 8 h in the individual experiment vs. after 24 …
