Digital Commons Network^™

Tribological Behaviour Of Enamel Coatings, Hong Huynh Nguyen, Shanhong Wan, Anh Kiet Tieu, Sang Pham, Hongtao Zhu

Faculty of Engineering and Information Sciences - Papers: Part B

An experimental study has been carried out to evaluate the tribological and mechanical properties of steel hardened with glass-ceramic enamel under ambient conditions. Three types of borosilicate based enamels were fused onto mild steel by the firing process, after a sandblasting and a ground coat to ensure surface integrity between the substrate and the covering coat. The surface roughness, micro hardness, wear track and tribological characteristics of the enamel coating were then characterised by an atomic force microscopy, a Vicker micro-hardness tester, a 3D optical profiler, an EDS/SEM, and a friction and wear testing tribology meter. The tribological differentials of …

Correlation Between Crystal Rotation And Redundant Shear Strain In Rolled Single Crystals: A Crystal Plasticity Fe Analysis, Hui Wang, Cheng Lu, Anh Kiet Tieu, Yu Liu, Rui Wang, Jintao Li

Faculty of Engineering and Information Sciences - Papers: Part B

The correlation between crystal rotation and redundant shear strain in rolled single crystals was investigated by using the crystal plasticity finite element (CPFE) model in this paper. The deformation in aluminium single crystals of four representative orientations (rotated-Cube, Goss, Copper, and Brass) after rolling and plain strain compression was simulated, and the predictions have been validated by the experimental observations. In the rotated-Cube and Goss, the redundant shear strain and crystal rotation were in the same pattern, alternating along the thickness, while the relation between them was not obvious for the Copper and Brass due to their asymmetrical distributions of …

Pullout Behaviour Of Different Types Of Steel Fibres Embedded In Magnesium Phosphate Cementitious Matrix, Hu Feng, M Neaz Sheikh, Muhammad N. S Hadi, Lu Feng, Danying Gao, Jun Zhao

Faculty of Engineering and Information Sciences - Papers: Part B

A series of pullout tests were conducted to investigate the interface bond properties of seven types of steel fibres embedded in the magnesium phosphate cementitious matrix. The micromorphology of the interface transition zone between MPC and different types of fibres was examined by scanning electron microscope. Test results showed that smaller diameter steel fibres with brass coating surface achieved higher average bond strength, higher pullout energy per unit volume and a higher ratio of material use. The end hook deformation provided the mechanical bond locally whereas the deformation along the length of fibre provided the mechanical bond distributed along the …

Spectral Flow Of Monopole Insertion In Topological Insulators, Alan L. Carey, Hermann Schulz-Baldes

Faculty of Engineering and Information Sciences - Papers: Part B

Inserting a magnetic flux into a two-dimensional one-particle Hamiltonian leads to a spectral flow through a given gap which is equal to the Chern number of the associated Fermi projection. This paper establishes a generalization to higher even dimension by inserting non-abelian monopoles of the Wu-Yang type. The associated spectral flow is then equal to a higher Chern number. For the study of odd spacial dimensions, a new so-called 'chirality flow' is introduced which, for the insertion of a monopole, is then linked to higher winding numbers. This latter fact follows from a new index theorem for the spectral flow …

Optimal Investment And Consumption Under A Continuous-Time Cointegration Model With Exponential Utility, Guiyuan Ma, Song-Ping Zhu

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, we study the effects of cointegration on optimal investment and consumption strategies for an investor with exponential utility. A Hamilton-Jacobi-Bellman (HJB) equation is derived first and then solved analytically. Both the optimal investment and consumption strategies are expressed in closed form. A verification theorem is also established to demonstrate that the solution of the HJB equation is indeed the solution of the original optimization problem under an integrability condition. In addition, a simple and sufficient condition is proposed to ensure that the integrability condition is satisfied. Financially, the optimal investment and consumption strategies are decomposed into two …

A Mixed Finite Element Method For A Sixth-Order Elliptic Problem, Jerome Droniou, Muhammad Ilyas, Bishnu Lamichhane, Glen Wheeler

Faculty of Engineering and Information Sciences - Papers: Part B

We consider a saddle-point formulation for a sixth-order partial differential equation and its finite element approximation, for two sets of boundary conditions. We follow the Ciarlet-Raviart formulation for the biharmonic problem to formulate our saddle-point problem and the finite element method. The new formulation allows us to use the H 1 -conforming Lagrange finite element spaces to approximate the solution. We prove a priori error estimates for our approach. Numerical results are presented for linear and quadratic finite element methods.

Knowledge-Aided Target Detection For Multistatic Passive Radar, Guohao Sun, Wei Zhang, Jun Tong, Zishu He, Zhihang Wang

Faculty of Engineering and Information Sciences - Papers: Part B

This paper studies the detection problem for multistatic passive radar. We consider scenarios where prior knowledge about the spectrum and peak-to-average ratio (PAR) of the non-cooperative illuminators of opportunity (IOs) is available. We develop several knowledge-aided (KA) detectors within the framework of the generalized likelihood ratio test (GLRT) to exploit such prior knowledge. Particularly, the knowledge about the bandwidth of the transmitted signal is employed to suppress the out-of-band noise, and the knowledge about the PAR constraint is exploited to eliminate the remaining high-power noise. The challenge of unknown spectrum condition is also addressed, where block sparse Bayesian learning (BSBL) …

Development Of An Enthalpy-Based Index To Assess Climatic Potential For Ventilative Cooling Of Buildings: An Australian Example, Massimo Fiorentini, Federico Tartarini, Laia Ledo Gomis, Daniel J. Daly, Paul Cooper

Faculty of Engineering and Information Sciences - Papers: Part B

Ventilative Cooling is a promising technique to improve the energy efficiency of buildings through reduced need for mechanical cooling to maintain thermal comfort. To assess the feasibility of Ventilative Cooling in a specific location, it is useful for designers to be able to evaluate the climate potential for cooling. This paper describes a new and enhanced version of the Climatic Cooling Potential (CCP) method, which is a simplified method to evaluate the climate potential for passive cooling that does not require detailed knowledge of the building characteristics. The proposed Enthalpy Climatic Cooling Potential (CCPh) integrates humidity into the climate evaluation, …

A New Standard Dna Damage (Sdd) Data Format, Jan Schuemann, A L. Mcnamara, J Warmenhoven, N Henthorn, K Kirkby, M Merchant, S Ingram, Harald Paganetti, Kathryn D. Held, J Ramos-Mendez, B Faddegon, J Perl, D Goodhead, I Plante, Hans Rabus, Heidi Nettelbeck, W Friedland, P Kundrat, A Ottolenghi, G Baiocco, S Barbieri, M Dingfelder, Sebastien Incerti, Carmen Villagrasa, M Bueno, M A. Bernal, Susanna Guatelli, Dosatsu Sakata, J Brown, Z Francis, Ioanna Kyriakou, N Lampe, F Ballarini, M Carante, M Davidkova, V Stepan, X Jia, F. Cucinotta, Reinhard W. Schulte, R Stewart, David Carlson, S Galer, Zdenka Kuncic, S Lacombe, J Milligan, S Cho, G Sawakuchi, T Inaniwa, T Sato, W Li, Audrey V. Solov'yov, Eugene Surdutovich, M Durante, Kevin M. Prise, Stephen J. Mcmahon

Faculty of Engineering and Information Sciences - Papers: Part B

Our understanding of radiation-induced cellular damage has greatly improved over the past few decades. Despite this progress, there are still many obstacles to fully understand how radiation interacts with biologically relevant cellular components, such as DNA, to cause observable end points such as cell killing. Damage in DNA is identified as a major route of cell killing. One hurdle when modeling biological effects is the difficulty in directly comparing results generated by members of different research groups. Multiple Monte Carlo codes have been developed to simulate damage induction at the DNA scale, while at the same time various groups have …

Removal Of Pharmaceuticals And Illicit Drugs From Wastewater Due To Ferric Dosing In Sewers, Jagadeeshkumar Kulandaivelu, Jianfa Gao, Yarong Song, Sohan Shrestha, Xuan Li, Jiaying Li, Katrin Doederer, Jurg Keller, Zhiguo Yuan, Jochen F. Mueller, Guangming Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

Ferric (Fe3+) salt dosing is an efficient sulfide control strategy in the sewer network, with potential for multiple benefits including phosphorus removal in the biological reactors and sulfide emission control in the anaerobic digesters of wastewater treatment plant (WWTP). This paper extends the knowledge on the benefit of iron dosing by exploring its impact on the fate of organic micropollutants (MPs) in the wastewater using sewer reactors simulating a rising main sewer pipe. The sulfide produced by the sewer biofilms reacted with Fe3+ forming black colored iron sulfide (FeS). Among the selected MPs, morphine, methadone, and atenolol had >90% initial …

Effects Of Principal Stress Rotation On The Fluid-Induced Soil Response In A Porous Seabed, Zhengxu Li, Dong Jeng, Jian Zhu, Hongyi Zhao

Faculty of Engineering and Information Sciences - Papers: Part B

Principal stress rotation (PSR) is an important feature for describing the stress status of marine sediments subject to cyclic loading. In this study, a one-way coupled numerical model that combines the fluid model (for wave-current interactions) and the soil model (including the effect of PSR) was established. Then, the proposed model was incorporated into the finite element analysis procedure DIANA-SWANDYNE II with PSR effects incorporated and further validated by the experimental data available in the literature. Finally, the impact of PSR on the pore-water pressures and the resultant seabed liquefaction were investigated using the numerical model, and it was found …

An Innovative Gynecological Hdr Brachytherapy Applicator System For Treatment Delivery And Real-Time Verification, Anna Romanyukha, Mauro Carrara, Davide Mazzeo, Chiara Tenconi, Tebarak Al-Salmani, Joel Poder, Dean L. Cutajar, Iolanda Fuduli, Marco Petasecca, Joseph A. Bucci, Annamaria Cerrotta, Brigida Pappalardi, Federica Piccolo, Emanuele Pignoli, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

The multichannel vaginal cylinder (MVC) applicator employed for gynecological high dose rate (HDR) brachytherapy increases dose delivery complexity, and thus makes the treatment more prone to errors. A quality assurance (QA) procedure tracking the source throughout dose delivery can detect dwell position and time errors in the multiple channels of the applicator.

A new MVC system with integrated real time in vivo treatment delivery QA has been developed based on diodes embedded on the outer surface of the MVC. It has been pre-calibrated and verified using a non-clinical treatment plan with consecutive test positions and dwell times within each catheter, …

Brachyview: Verification Of Ldr Patient Plans - Hardware Optimisation, Taylah Brennen, Dean L. Cutajar, Saree Alnaghy, Joseph A. Bucci, Andrej Bece, Marco Favoino, M Carriero, Michael L. F Lerch, Anatoly B. Rosenfeld, M Petasseca

Faculty of Engineering and Information Sciences - Papers: Part B

BrachyView is a novel in-body imaging system developed with the objective to provide real-time intraoperative dosimetry for low dose rate (LDR) prostate brachytherapy treatments. Seed positions can be reconstructed after implantation by the means of a high-resolution pinhole gamma camera. The obtained dataset is then combined with conventional trans-rectal ultrasound (TRUS) imaging to locate the effective source position within the prostate volume. This study presents a comparison of two data sets containing 96 and 98 I-25 brachytherapy sources and readout by two different pin-hole collimators with 800 m and 500 m, respectively. This study aims to assess the effect on …

Accuracy Of Low-Dose Proton Ct Image Registration For Pretreatment Alignment Verification In Reference To Planning Proton Ct, R Cassetta, Pierluigi Piersimoni, Marco Riboldi, Valentina Giacometti, Vladimir Bashkirov, Guido Baroni, Caesar Ordonez, G Coutrakon, Reinhard W. Schulte

Faculty of Engineering and Information Sciences - Papers: Part B

Purpose: Proton CT (pCT) has the ability to reduce inherent uncertainties in proton treatment by directly measuring the relative proton stopping power with respect to water, thereby avoiding the uncertain conversion of X-ray CT Hounsfield unit to relative stopping power and the deleterious effect of X- ray CT artifacts. The purpose of this work was to further evaluate the potential of pCT for pretreatment positioning using experimental pCT data of a head phantom. Methods: The performance of a 3D image registration algorithm was tested with pCT reconstructions of a pediatric head phantom. A planning pCT simulation scan of the phantom …

Sabr In Clinical Trials: What Quality Assurance (Qa) Is Required And How Can It Be Done?, Tomas Kron, Nicholas G. Hardcastle

Faculty of Engineering and Information Sciences - Papers: Part B

Stereotactic Ablative Body Radiotherapy (SABR) has become widely used radiotherapy treatment modality for many indications ranging from early stage disease to an oligometastatic setting. All this combines the use of virtually all technological advances that characterise modern radiotherapy from small conformal fields to intensity modulation and explicit accounting for motion. However, given its novelty, clinical evidence for SABR is still emerging and many clinical trails include SABR as the intervention to define (eg in dose or fractionation defining studies) or to test against other treatment modalities. In any case, physical quality assurance (QA) must be an essential aspect of the …

A Joint Local And Global Deep Metric Learning Method For Caricature Recognition, Wenbin Li, Jing Huo, Yinghuan Shi, Yang Gao, Lei Wang, Jiebo Luo

Faculty of Engineering and Information Sciences - Papers: Part B

Caricature recognition is a novel, interesting, yet challenging problem. Due to the exaggeration and distortion, there is a large cross-modal gap between photographs and caricatures, making it nontrivial to match the features of photographs and caricatures. To address the problem, a joint local and global metric learning method (LGDML) is proposed. First, joint local and global feature representation is learnt with convolutional neural networks to find both discriminant features of local facial parts and global distinctive features of the whole face. Next, in order to fuse the local and global similarities of features, a unified feature representation and similarity measure …

Towards The Readiness Of Learning Analytics Data For Micro Learning, Jiayin Lin, Geng Sun, Jun Shen, Tingru Cui, Ping Yu, Dongming Xu, Li Li, Ghassan Beydoun

Faculty of Engineering and Information Sciences - Papers: Part B

With the development of data mining and machine learning techniques, data-driven based technology-enhanced learning (TEL) has drawn wider attention. Researchers aim to use established or novel computational methods to solve educational problems in the 'big data' era. However, the readiness of data appears to be the bottleneck of the TEL development and very little research focuses on investigating the data scarcity and inappropriateness in the TEL research. This paper is investigating an emerging research topic in the TEL domain, namely micro learning. Micro learning consists of various technical themes that have been widely studied in the TEL research field. In …

Modelling The X-Ray Source For The Australian Mri-Linac, Natalia Roberts, Bradley M. Oborn, U Jelen, B Dong, Jarrad Begg, Armia George, Saree Alnaghy, Trent Causer, Thahabah Alharthi, Lois C. Holloway, Peter E. Metcalfe

Faculty of Engineering and Information Sciences - Papers: Part B

MRI-guided radiotherapy allows real-time imaging during treatment however the magnetic field influences the dose distribution in the patient. An accurate model of the radiation beam and the encompassing magnetic field is important to predict dosimetry changes. The purpose of this work is to develop a Monte Carlo model of the Australian MRI-Linac to be used as input into a dose calculation tool for treatment planning. The Australian MRI-Linac is a 1 T inline system with a 6MV flattening filter free photon beam. Commissioning measurements were undertaken both with and without the magnetic field present, PDDs and profiles were used to …

Characterization Of Prompt Gamma Ray Emission For In Vivo Range Verification In Particle Therapy: A Simulation Study, Melek Zarifi, Susanna Guatelli, Yujin Qi, David Bolst, Dale A. Prokopovich, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper we investigate the emission and detection characteristics of prompt gamma (PG) rays for in vivo range verification during hadron therapy, using Geant4 simulations. Proton, 4 He and 12 C beams of varying energy are incident on water phantoms. The PG production yield, energy spectral characteristics and spatial correlation with the Bragg Peak (BP) have been quantified. Further, the angular distributions for PG detection with respect to a point-of-reference on the phantom surface have been explored. The temporal properties of PG emission and time-of-flight (TOF) of PG detection have also been investigated in correlation with the changing particle …

Investigating Variable Rbe In A 12c Minibeam Field With Microdosimetry And Geant4, Emily Debrot, David Bolst, Benjamin James, Linh Tran, Susanna Guatelli, Marco Petasecca, Dale A. Prokopovich, Mark I. Reinhard, Naruhiro Matsufuji, Michael A. Jackson, Michael L. F Lerch, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

An experimental and simulation-based study was performed on a 12C ion minibeam radiation therapy (MBRT) field produced with a clinical broad beam and a brass multi-slit collimator (MSC). Silicon-on-insulator (SOI) microdosimeters developed at the Centre for Medical Radiation Physics (CMRP) with micron sized sensitive volumes were used to measure the microdosimetric spectra at varying positions throughout the MBRT field and the corresponding dose-mean lineal energies and RBE for 10% cell survival (RBE10) were calculated using the modified Microdosimetric Kinetic Model (MKM). An increase in the average RBE10 of ∼30% and 10% was observed in the plateau region compared to broad …

Monte Carlo Investigation Of The Characteristics Of Radioactive Beams For Heavy Ion Therapy, Andrew Chacon, Mitra Safavi-Naeini, David Bolst, Susanna Guatelli, Daniel R. Franklin, Yuma Iwao, Go Akamatsu, Hideaki Tashima, Eiji Yoshida, Fumihiko Nishikido, Atsushi Kitagawa, Akram Mohammadi, Marie-Claude Gregoire, Taiga Yamaya, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.

The Suspension Of A Graph, And Associated C⁎-Algebras, Aidan Sims

Faculty of Engineering and Information Sciences - Papers: Part B

Given a directed graph E, we construct for each real number l a quiver whose vertex space is the topological realisation of E, and whose edges are directed paths of length l in the vertex space. These quivers are not topological graphs in the sense of Katsura, nor topological quivers in the sense of Muhly and Tomforde. We prove that when l=1 and E is finite, the infinite-path space of the associated quiver is homeomorphic to the suspension of the one-sided shift of E. We call this quiver the suspension of E. We associate both a Toeplitz algebra and a …

Microstructure And Mechanical Properties Of Thin Varying Thickness Strips With Different Transition Zones Produced By Micro Flexible Rolling, Mingshuai Huo, Jingwei Zhao, Haibo Xie, Shengli Li, Hongmei Zhang, Zhiping Hu, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

In order to better understand transition zones with a variety of structural features that affect thin varying thickness strips, 6061 aluminium alloy thin strips were flexibly rolled into different thickness ratios and transition zone lengths, using an innovative micro rolling mill. The microstructure and mechanical properties of the thin varying thickness strips produced by micro flexible rolling were systematically investigated and the mechanisms were analysed. The results indicate that a thin varying thickness strip with either a larger thickness ratio or a shorter transition zone length will present a relatively high slope of the transition zone during micro flexible rolling. …

Quantification Of Texture-Induced Ridging In Ferritic Stainless Steels 430 And 430lr During Tensile Deformation, Xiaoguang Ma, Jingwei Zhao, Wei Du, Xin Zhang, Laizhu Jiang, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

A comparative study has been carried out to assess the effect of rolling and annealing processes on ridging generation of ferritic stainless steels (FSSs) 430 and 430LR after tensile deformation. The results show that FSS 430LR has better ridging resistance owing tothe refinement of microstructure and crystallographic texture optimisation. A 30% reduction of ridging height can be achieved using FSS 430LR compared to FSS 430 after tension.Optimal reduction during cold rolling benefits the microstructural refinement and surface quality improvement of FSSs 430 and 430LR. Both theoretical calculations and experimental results indicate that the (1 1 2) and the (0 0 …

Numerical And Experimental Studies On A New Variable Stiffness And Damping Magnetorheological Fluid Damper, Hui Huang, Shuaishuai Sun, Shumei Chen, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

This article describes a new magnetorheological fluid damper; its damping and stiffness are variable and controllable through the compact structure of two damping units and a spring. The ability of variable stiffness and damping enables it to be used for more effective vibration control in wide-band excitation wave occasions. First, the effective stiffness and output damping force are calculated in theory. Then, the magnetic field is simulated by finite element analysis. After the prototype of the new magnetorheological fluid damper is developed and machined, the damper's performances are tested in a hydraulic actuated MTS machine, including stiffness variability and damping …

Rapid, One-Step Preparation Of Sers Substrate In Microfluidic Channel For Detection Of Molecules And Heavy Metal Ions, Sheng Yan, Fangjia Chu, Haiyun Zhang, Yuan Yuan, Yingzhou Huang, Anping Liu, Shuxia Wang, Weihua Li, Shunbo Li, Weijia Wen

Faculty of Engineering and Information Sciences - Papers: Part B

On-chip fabrication of surface-enhanced Raman spectroscopy (SERS)-active materials enables continuous, real-time sensing of targets in the microfluidic chip. However, the current techniques require the time-consuming, complicated process and costly, bulky facilities. In this work, we present a novel method for synthesis of Ag nanostructures in a microfluidic channel via one-step electroless galvanic replacement reaction. The whole reaction could be achieved <10 >mins, while the traditional methods take hours. The microfluidic channel has a Cu base, which can reduce Ag ions to Ag nanoparticles in the presence of AgNO₃ solution. The new technique enables the label-free sensing of chemical molecules (i.e., …

Conditionally Integrable Nonlinear Diffusion With Diffusivity 1/U, Philip Broadbridge, Joanna M. Goard

Faculty of Engineering and Information Sciences - Papers: Part B

An explicit mapping is given from the space of general complex meromorphic functions to a space of special time-dependent solutions of the 1 + 2-dimensional nonlinear diffusion equation with diffusivity depending on concentration as D = 1/u. These solutions have constant-flux boundary conditions. Some simple examples are constructed, including that of a line source enclosed by a cylindrical barrier. This has direct application to electron diffusion in a laser-heated plasma.

Carbon Nanotube Based Fiber Supercapacitor As Wearable Energy Storage, Zan Lu, Raad Raad, Farzad Safaei, Jiangtao Xi, Zhoufeng Liu, Javad Foroughi

Faculty of Engineering and Information Sciences - Papers: Part B

Energy storage is a key requirement for the emerging wearable technologies. Recent progress in this direction includes the development of fiber based batteries and capacitors and even some examples of such fibers incorporated into prototype textiles. Herein we discuss the advantages of using the wet-spinning process to create nanostructured carbon basedmaterials as wearable energy storage. The ability to control the physical, mechanical, electrical, and electrochemical properties of carbon nanotube based fibers holds great promise to develop smart polymeric structure as an energy storing materials including fibers and textiles. This is the first comprehensive review to discuss effect of nanostructured energy …

End-To-End Multimodal 16-Day Hatching Eggs Classification, Lei Geng, Zhen Peng, Zhitao Xiao, Jiangtao Xi

Faculty of Engineering and Information Sciences - Papers: Part B

Sixteen-day hatching eggs are divided into fertile eggs, waste eggs, and recovered eggs. Because different categoriesmayhave the same characteristics, they are difficult to classify. Fewexisting algorithms can successfully solve this problem. To this end, we propose an end-to-end deep learning network structure that uses multiple forms of signals. First, we collect the photoplethysmography (PPG) signal of the hatching eggs to obtain heartbeat information and photograph hatching eggs with a camera to obtain blood vessel pictures. Second, we use two different network structures to process the two kinds of signals: Temporal convolutional networks are used to process heartbeat information, and convolutional …

Evaluation Of Coal Seam Gas Drainability For Outburst-Prone And High-Co2-Containing Coal Seam, Lei Zhang, Ting X. Ren, Naj Aziz, Cun Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents the results of an evaluation study of gas drainability in the Bulli seam in the Southern Coalfield of the Sydney Basin, NSW, Australia, where the coal seam gas (CSG) contains a high proportion of carbon dioxide (CO 2 ). Historically the gas drainability in some particular areas of this coal seam was found to be particularly poor, which posed a significant challenge to gas predrainage. As a result, a large volume of greenhouse gases were released to the atmosphere during mining of the coal seam. Furthermore, the high gas content associated with the CO 2 -rich composition …