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Full-Text Articles in Social and Behavioral Sciences

Robust Adaptive Sliding Mode Pi Control For Active Vehicle Seat Suspension Systems, Wenxing Li, Haiping Du, Donghong Ning, Weihua Li Jan 2019

Robust Adaptive Sliding Mode Pi Control For Active Vehicle Seat Suspension Systems, Wenxing Li, Haiping Du, Donghong Ning, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, a robust adaptive sliding mode proportional integral control (RASMPIC) method is proposed for an active vehicle seat suspension system, where the driver's mass is supposed as an unknown parameter with boundaries. A dynamic active seat suspension system is established at first. Then a sliding mode controller (SMC) is designed to achieve the required ride comfort performance based on the driver's mass estimated by utilizing an adaptive law where a projecting adaptive algorithm is used to prevent the estimated parameters from surpassing their boundaries to enhance the robustness of the seat suspension system. Also, a proportional ...


Numerical Analysis Of Behavior Of Glass Fiber-Reinforced Polymer Bar-Reinforced Concrete Beams Under Impact Loads, Zein Saleh, M Neaz Sheikh, Alex M. Remennikov, Abheek Basu Jan 2019

Numerical Analysis Of Behavior Of Glass Fiber-Reinforced Polymer Bar-Reinforced Concrete Beams Under Impact Loads, Zein Saleh, M Neaz Sheikh, Alex M. Remennikov, Abheek Basu

Faculty of Engineering and Information Sciences - Papers: Part B

This paper numerically investigates the behavior of glass fiber-reinforced polymer (GFRP) bar-reinforced concrete beams (GFRP-RC beams) under low-velocity impact loads. A finite element model has been developed and calibrated against the experimental investigation results of six GFRP-RC beams. The results of the numerical analysis have been found in very good agreement with the experimental investigation results. The finite element model captured the failure modes, crack profiles, midspan deflection, impact and reaction forces, and dynamic strain of the GFRP-RC beams. Moreover, a parametric study has been carried out to investigate the influence of the reinforcement ratio, compressive strength of concrete, drop ...


Beach Safety: Can Drones Provide A Platform For Sighting Sharks?, Paul A. Butcher, Toby Piddocke, Andrew Colefax, Brent Hoade, Victor M. Peddemors, Lauren Borg, Brian R. Cullis Jan 2019

Beach Safety: Can Drones Provide A Platform For Sighting Sharks?, Paul A. Butcher, Toby Piddocke, Andrew Colefax, Brent Hoade, Victor M. Peddemors, Lauren Borg, Brian R. Cullis

Faculty of Engineering and Information Sciences - Papers: Part B

CSIRO 2019 Open Access. Context: A series of unprovoked shark attacks on New South Wales (Australia) beaches between 2013 and 2015 triggered an investigation of new and emerging technologies for protecting bathers. Traditionally, bather protection has included several methods for shark capture, detection and/or deterrence but has often relied on environmentally damaging techniques. Heightened environmental awareness, including the important role of sharks in the marine ecosystem, demands new techniques for protection from shark attack. Recent advances in drone-related technologies have enabled the possibility of real-time shark detection and alerting. Aim: To determine the reliability of drones to detect shark ...


Parametric Characterization Of Penumbra Reduction For Aperture-Collimated Pencil Beam Scanning (Pbs) Proton Therapy, Dominic Maes, Rajesh Regmi, Phillip Taddei, Charles Bloch, Steven Bowen, Alexander Nevitt, Erick Leuro, Tony Wong, Anatoly B. Rosenfeld, Jatinder Saini Jan 2019

Parametric Characterization Of Penumbra Reduction For Aperture-Collimated Pencil Beam Scanning (Pbs) Proton Therapy, Dominic Maes, Rajesh Regmi, Phillip Taddei, Charles Bloch, Steven Bowen, Alexander Nevitt, Erick Leuro, Tony Wong, Anatoly B. Rosenfeld, Jatinder Saini

Faculty of Engineering and Information Sciences - Papers: Part B

Recently, a commercial treatment planning system (TPS) has implemented aperture collimators for PBS dose calculations which can serve to reduce lateral penumbra. This study characterized the variation in magnitude of lateral penumbra for collimated and un-collimated PBS fields versus the parameters of air gap, depth, and range shifter thickness. Comparisons were performed in a homogenous geometry between measured data and calculations made by a commercial TPS. Beam-specific target volumes were generated for collimated and un-collimated PBS fields and optimized for various range shifter thicknesses and air gaps. Lateral penumbra (80%-20% distance) was measured across each target volume to characterize ...


Fault Diagnosis Of Reciprocating Compressor Using Component Estimating Empirical Mode Decomposition And De-Dimension Template With Double-Loop Correction Algorithm, Hongyi Wang, Feng Dong, Xinxiu Zhou, Hongyu Wang, Xinjun Zhu, Limei Song, Qinghua Guo Jan 2019

Fault Diagnosis Of Reciprocating Compressor Using Component Estimating Empirical Mode Decomposition And De-Dimension Template With Double-Loop Correction Algorithm, Hongyi Wang, Feng Dong, Xinxiu Zhou, Hongyu Wang, Xinjun Zhu, Limei Song, Qinghua Guo

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents an approach to implement multi-parameter (i.e., pressure, temperature, vibration, current, and liquid level) signals for fault diagnosis of the reciprocating compressor (RC). Due to the complexity of structure and motion of such compressor, the acquired signals involve transient impacts and noises. This causes the useful information to be corrupted and makes it difficult to diagnose the fault patterns accurately. A component estimating empirical mode decomposition (CEEMD) method is proposed to remove the random noise and improve data quality. Furthermore, a new template matching algorithm called de-dimension template with double-loop correction (DDT-DLC) is applied to diagnose the ...


Analog Least Mean Square Loop For Self-Interference Cancellation In In-Band Full-Duplex Systems, Anh Tuyen Le, Le Chung Tran, Xiaojing Huang, Y. Jay Guo Jan 2019

Analog Least Mean Square Loop For Self-Interference Cancellation In In-Band Full-Duplex Systems, Anh Tuyen Le, Le Chung Tran, Xiaojing Huang, Y. Jay Guo

Faculty of Engineering and Information Sciences - Papers: Part B

Analog Least Mean Square (ALMS) loop is a promising method to cancel self-interference (SI) in in-band full-duplex (IBFD) systems. In this talk, the steady state analyses of the residual SI powers in both analog and digital domains are derived in frequency domain. It is proved that the ALMS loop amplifies the frequency components of the residual SI at the edges of the signal spectrum in the analog domain, but the matched filter in the receiver chain reduces this effect. This results in a significant improvement of the interference suppression ratio in the digital domain before information data detection. The lower ...


Characterization Of A High Spatiotemporal Resolution Monolithic Silicon Strip Detector For Mri-Linac Dosimetry, Trent Causer, Tess Chapman, Bradley M. Oborn, Jeremy A. Davis, Marco Petasecca, Anatoly B. Rosenfeld, Peter E. Metcalfe Jan 2019

Characterization Of A High Spatiotemporal Resolution Monolithic Silicon Strip Detector For Mri-Linac Dosimetry, Trent Causer, Tess Chapman, Bradley M. Oborn, Jeremy A. Davis, Marco Petasecca, Anatoly B. Rosenfeld, Peter E. Metcalfe

Faculty of Engineering and Information Sciences - Papers: Part B

Multiple vendors are now offering real-time MRI-guided radiotherapy systems. Quality assurance of small fields delivered with an MR-RT system requires detectors with high spatiotemporal resolution, and magnetic insensitivity. High spatial resolution is required to characterise the asymmetric penumbra that transverse designs demonstrate. In this work the authors describe the characterisation of the dosimetric performance of a monolithic silicon strip detector mounted to a flexible polymide (Kapton) printed circuit board intended for use in MRI-linac dosimetry.


Metamorphic Relations For Data Validation: A Case Study Of Translated Text Messages, Boyang Yan, Brian Yecies, Zhi Q. Zhou Jan 2019

Metamorphic Relations For Data Validation: A Case Study Of Translated Text Messages, Boyang Yan, Brian Yecies, Zhi Q. Zhou

Faculty of Engineering and Information Sciences - Papers: Part B

In conventional metamorphic testing, metamorphic relations (MRs) are identified as necessary properties of a computer program's intended functionality, whereby violations of MRs reveal faults in the program - under the assumption that the source and follow-up inputs (test cases used in metamorphic testing) are valid. In the present study, the authors argue that MRs can also be used to validate and assess the quality of the program's input data - under the assumption that the source or follow-up inputs can be inappropriately generated. Using this new perspective, a case study in the natural language processing domain is used to explore ...


Aerodynamic Analysis Of A Stator-Augmented Linear Cascade Wind Turbine, Seyed A. Jafari, Kenny Kwok, Farzad Safaei, Buyung Kosasih, Ming Zhao Jan 2019

Aerodynamic Analysis Of A Stator-Augmented Linear Cascade Wind Turbine, Seyed A. Jafari, Kenny Kwok, Farzad Safaei, Buyung Kosasih, Ming Zhao

Faculty of Engineering and Information Sciences - Papers: Part B

This study proposes to attach stator vanes to PowerWindow, a linear cascade wind turbine, to improve the flow direction in the device. By controlling the angle of attack, the stator vanes increase the acting force and decrease the undesirable force on PowerWindow blades. An analytical model using blade element momentum theory is developed for the new configuration, referred to as stator-augmented PowerWindow. The analytical model has been verified by a computational fluid dynamic simulation. This study shows that the stator vanes are able to minimize/neutralize the undesirable axial force on PowerWindow so that the thrust coefficient decreases from 0 ...


Today's Monolithic Silicon Array Detector For Small Field Dosimetry: The Octa, Giordano Biasi, Khalsa Al Shukaili, Marco Petasecca, Stephanie Corde, Susanna Guatelli, Vladimir Perevertaylo, Tomas Kron, Anatoly B. Rosenfeld Jan 2019

Today's Monolithic Silicon Array Detector For Small Field Dosimetry: The Octa, Giordano Biasi, Khalsa Al Shukaili, Marco Petasecca, Stephanie Corde, Susanna Guatelli, Vladimir Perevertaylo, Tomas Kron, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

The dosimetry of small photon beams is challenging due to detector position uncertainties, dose averaging and lack of electronic equilibrium. Currently only few, single detectors are suitable for measurements in this context, and none is ideal. This study reports on the dosimetric characterization of small fields collimated by fixed cones, performed by a novel 2D monolithic silicon array detector, the Octa.


Efficient Attribute-Based Encryption With Privacy-Preserving Key Generation And Its Application In Industrial Cloud, Yujiao Song, Hao Wang, Xiaochao Wei, Lei Wu Jan 2019

Efficient Attribute-Based Encryption With Privacy-Preserving Key Generation And Its Application In Industrial Cloud, Yujiao Song, Hao Wang, Xiaochao Wei, Lei Wu

Faculty of Engineering and Information Sciences - Papers: Part B

Due to the rapid development of new technologies such as cloud computing, Internet of Things (IoT), and mobile Internet, the data volumes are exploding. Particularly, in the industrial field, a large amount of data is generated every day. How to manage and use industrial Big Data primely is a thorny challenge for every industrial enterprise manager. As an emerging form of service, cloud computing technology provides a good solution. It receives more and more attention and support due to its flexible configuration, on-demand purchase, and easy maintenance. Using cloud technology, enterprises get rid of the heavy data management work and ...


Variance And Volatility Swaps Under A Two-Factor Stochastic Volatility Model With Regime Switching, Xinjiang He, Song-Ping Zhu Jan 2019

Variance And Volatility Swaps Under A Two-Factor Stochastic Volatility Model With Regime Switching, Xinjiang He, Song-Ping Zhu

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, the pricing problem of variance and volatility swaps is discussed under a two-factor stochastic volatility model. This model can be treated as a two-factor Heston model with one factor following the CIR process and another characterized by a Markov chain, with the motivation originating from the popularity of the Heston model and the strong evidence of the existence of regime switching in real markets. Based on the derived forward characteristic function of the underlying price, analytical pricing formulae for variance and volatility swaps are presented, and numerical experiments are also conducted to compare swap prices calculated through ...


A 3d-Printed Omni-Purpose Soft Gripper, Charbel Tawk, Andrew Gillett, Marc In Het Panhuis, Geoffrey M. Spinks, Gursel Alici Jan 2019

A 3d-Printed Omni-Purpose Soft Gripper, Charbel Tawk, Andrew Gillett, Marc In Het Panhuis, Geoffrey M. Spinks, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part B

Numerous soft grippers have been developed based on smart materials, pneumatic soft actuators, and underactuated compliant structures. In this article, we present a three-dimensional (3-D) printed omni-purpose soft gripper (OPSOG) that can grasp a wide variety of objects with different weights, sizes, shapes, textures, and stiffnesses. The soft gripper has a unique design that incorporates soft fingers and a suction cup that operate either separately or simultaneously to grasp specific objects. A bundle of 3-D-printable linear soft vacuum actuators (LSOVA) that generate a linear stroke upon activation is employed to drive the tendon-driven soft fingers. The support, fingers, suction cup ...


Experimental Investigation And Performance Analysis Of An Organic Rankine Cycle For Low-Temperature Heat To Electricity Generation, Lili Wei, Zhenjun Ma, Xuemei Gong, Xiujuan Guo Jan 2019

Experimental Investigation And Performance Analysis Of An Organic Rankine Cycle For Low-Temperature Heat To Electricity Generation, Lili Wei, Zhenjun Ma, Xuemei Gong, Xiujuan Guo

Faculty of Engineering and Information Sciences - Papers: Part B

© 2019 The Author(s) 2019. Published by Oxford University Press. This paper presents experimental investigation of low-temperature heat to electricity generation system based on Organic Rankine Cycle (ORC) using R152a as the working fluid. Both energy efficiency and exergy efficiency were analyzed based on the experiments. Although energy efficiency was low to 5.0% when the evaporating and cooling temperatures were 65°C and 11°C, respectively, the exergy efficiency reached 25%, which showed great competitiveness among low-temperature heat utilization technologies. To reveal the energy recovery proportion from the waste heat, both energy extraction efficiency and exergy extraction efficiency as ...


Study On Performance Evaluation Of Co2 Heat Pump System Integrated With Thermal Energy Storage For Space Heating, Zhihua Wang, Yuxin Zheng, Fenghao Wang, Mengjie Song, Zhenjun Ma Jan 2019

Study On Performance Evaluation Of Co2 Heat Pump System Integrated With Thermal Energy Storage For Space Heating, Zhihua Wang, Yuxin Zheng, Fenghao Wang, Mengjie Song, Zhenjun Ma

Faculty of Engineering and Information Sciences - Papers: Part B

CO2 heat pumps have drawn a great deal of attention owing to their advantages of high efficiency and environmental friendly for heating water under low ambient temperature. However, the system performance is not desirable and shows a lower COP for space heating, especially for a radiator as heating terminal, due to the higher inlet water temperature at the gas cooler, which causes a large throttle loss when the refrigerant flow through the throttling device. To tackle this issue, a transcritical CO2 heat pump system integrated with thermal energy storage (TES) systems was developed in this paper. The heating performance of ...


Experimental Investigation Of Fracture Propagation Behavior Induced By Hydraulic Fracturing In Anisotropic Shale Cores, Zhaohui Chong, Qiangling Yao, Xuehua Li Jan 2019

Experimental Investigation Of Fracture Propagation Behavior Induced By Hydraulic Fracturing In Anisotropic Shale Cores, Zhaohui Chong, Qiangling Yao, Xuehua Li

Faculty of Engineering and Information Sciences - Papers: Part B

Hydraulic fracturing is a key technology for the development of unconventional resources such as shale gas. Due to the existence of numerous bedding planes, shale reservoirs can be considered typical anisotropic materials. In anisotropic shale reservoirs, the complex hydraulic fracture network (HFN) formed by the interaction of hydraulic fracture (HF) and bedding plane (BP) is the key to fracturing treatment. In this paper, considering the anisotropic angle, stress state and injection rate, a series of hydraulic fracturing experiments were conducted to investigate the effect of anisotropic characteristics of shale reservoirs on HFN formation. The results showed that the breakdown pressure ...


A Monte Carlo Study On The Feasibility Of Real-Time In Vivo Source Tracking During Ultrasound Based Hdr Prostate Brachytherapy Treatments, Joel Poder, Dean L. Cutajar, Susanna Guatelli, Marco Petasecca, Andrew Howie, Joseph A. Bucci, Mauro Carrara, Anatoly B. Rosenfeld Jan 2019

A Monte Carlo Study On The Feasibility Of Real-Time In Vivo Source Tracking During Ultrasound Based Hdr Prostate Brachytherapy Treatments, Joel Poder, Dean L. Cutajar, Susanna Guatelli, Marco Petasecca, Andrew Howie, Joseph A. Bucci, Mauro Carrara, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

Purpose

This study aims to assess the accuracy of in-vivo source tracking during real-time trans-rectal ultrasound (TRUS) based high dose rate (HDR) prostate brachytherapy (pBT) through Monte Carlo simulations of multiple HDR pBT treatments with a two-dimensional (2D) diode array, the Magic Plate 900 (MP900), embedded below the patient in a carbon-fibre couch.

Method

Monte Carlo simulations of source positions representing three separate real-time TRUS based HDR pBT treatments were performed using the Geant4 toolkit. For each source position, an Ir-192 source was simulated inside a voxelized patient geometry. Dose deposited from each source position to the MP900 diodes was ...


Comparison Of Butyric Acid Leaching Behaviors Of Zinc From Three Basic Oxygen Steelmaking Filter Cakes, Jingxiu Wang, Zhe Wang, Zhongzhi Zhang, Guangqing Zhang Jan 2019

Comparison Of Butyric Acid Leaching Behaviors Of Zinc From Three Basic Oxygen Steelmaking Filter Cakes, Jingxiu Wang, Zhe Wang, Zhongzhi Zhang, Guangqing Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

The selective leaching of zinc from three different basic oxygen steelmaking (BOS) filter cakes by butyric acid was investigated to compare the leaching behaviors of zinc and further to establish the correlation of the zinc leaching performances and the chemical compositions. The effects of acid concentration and the acid to solid (L/S) stoichiometric ratio were studied, with different optimal leaching conditions obtained. BOS-1 showed the lowest leachability with only less than 10% of zinc removed by 0.5 M acid concentration and 90% of the L/S stoichiometric ratio in 10 h. The best zinc selectivity was achieved with ...


Comparison Of The Mineralogy Of Iron Ore Sinters Using A Range Of Techniques, Tom Honeyands, James Manuel, Leanne Matthews, Damien O'Dea, David J. Pinson, J Leedham, Guangqing Zhang, Huibin Li, Brian J. Monaghan, Xinliang Liu, Eugene Donskoi, Nathan A.S. Webster, Mark Pownceby Jan 2019

Comparison Of The Mineralogy Of Iron Ore Sinters Using A Range Of Techniques, Tom Honeyands, James Manuel, Leanne Matthews, Damien O'Dea, David J. Pinson, J Leedham, Guangqing Zhang, Huibin Li, Brian J. Monaghan, Xinliang Liu, Eugene Donskoi, Nathan A.S. Webster, Mark Pownceby

Faculty of Engineering and Information Sciences - Papers: Part B

Many different approaches have been used in the past to characterise iron ore sinter mineralogy to predict sinter quality and elucidate the impacts of iron ore characteristics and process variables on the mechanisms of sintering. This paper compares the mineralogy of three sinter samples with binary basicities (mass ratio of CaO/SiO2) between 1.7 and 2.0. The measurement techniques used were optical image analysis and point counting (PC), quantitative X‐ray diffraction (QXRD) and two different scanning electron microscopy systems, namely, Quantitative Evaluation of Materials by Scanning Electron Microscopy (QEMSCAN) and TESCAN Integrated Mineral Analyser (TIMA). Each ...


Coffee-An Mpi-Parallelized Python Package For The Numerical Evolution Of Differential Equations, George Doulis, Jorg Frauendiener, Chris Stevens, Benjamin E. Whale Jan 2019

Coffee-An Mpi-Parallelized Python Package For The Numerical Evolution Of Differential Equations, George Doulis, Jorg Frauendiener, Chris Stevens, Benjamin E. Whale

Faculty of Engineering and Information Sciences - Papers: Part B

COFFEE (Conformal Field Equation Evolver) is a Python package primarily developed to numerically evolve systems of partial differential equations over time using the method of lines. It includes a variety of time integrators and finite differencing stencils with the summation-by-parts property, as well as pseudo-spectral functionality for angular derivatives of spin-weighted functions. Some additional capabilities include being MPI-parallelisable on a variety of different geometries, HDF data output and post processing scripts to visualize data, and an actions class that allows users to create code for analysis after each timestep.


Fire-Resistance Of Eccentrically Loaded Rectangular Concrete-Filled Steel Tubular Slender Columns Incorporating Interaction Of Local And Global Buckling, Ghanim Mohammed Kamil, Qing Quan Liang, Muhammad N. S Hadi Jan 2019

Fire-Resistance Of Eccentrically Loaded Rectangular Concrete-Filled Steel Tubular Slender Columns Incorporating Interaction Of Local And Global Buckling, Ghanim Mohammed Kamil, Qing Quan Liang, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

A mathematical model using the fiber approach is presented in this paper for quantifying the strength and fire-resistance of eccentrically loaded slender concrete-filled steel tubular (CFST) columns with rectangular sections incorporating the interaction of local and global buckling. The model utilizes the thermal simulator to ascertain the temperature distribution in cross-sections, and the nonlinear global buckling analysis to predict the interaction responses of local and global buckling of loaded CFST slender columns to fire effects. The initial geometric imperfection, air gap between the concrete and steel tube, tensile concrete strength, deformations caused by preloads, and temperature-dependent material behavior are included ...


Top Sheath Flow-Assisted Secondary Flow Particle Manipulation In Microchannels With The Slanted Groove Structure, Qianbin Zhao, Dan Yuan, Shiyang Tang, Guolin Yun, Sheng Yan, Jun Zhang, Weihua Li Jan 2019

Top Sheath Flow-Assisted Secondary Flow Particle Manipulation In Microchannels With The Slanted Groove Structure, Qianbin Zhao, Dan Yuan, Shiyang Tang, Guolin Yun, Sheng Yan, Jun Zhang, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

In the regime of inertial microfluidics, the secondary flow is widely adopted to reduce the number of the equilibrium position and improve the focusing performance of particles. At the same time, secondary flow can also enhance the mixing effect and may deteriorate particle focusing due to the induced rotating streams, especially for the particle with a small size. In a double-layered microchannel with slanted groove structures, it has been demonstrated that the generated secondary flow at a high flow rate could focus the particle with a large size (> 8 µm). However, the manipulation of small-size particles (< 8 µm) was unsuccessful as the effects of secondary flow on the small-size particles were not strong enough. In this work, to manipulate the small-size particle, we proposed a scheme to utilize a top sheath flow to enhance the focusing efficiency of the structure-induced secondary flow. The effects of the total flow rate and the flow rate ratio between the sheath and sample flow were investigated comprehensively in a large range. The 4.8 µm particle could be manipulated effectively at different flow rates with the assistance of appropriate sheath flows. Besides, the effects of other factors, such as the quantity of the expansion groove structure, and particle concentration and size, on particle focusing performance were also investigated. We found that the particles with the diameter of 2.9 µm can also be effectively focused within the double-layered microchannel. Furthermore, we demonstrated the continuous plasma extraction from the undiluted whole blood using this proposed technique to validate its potential biological applications. The results show that the purity of plasma extracted could reach up to ~ 99% after a single process. As such, this demonstrated that sheath flow-assisted particle manipulating method can overcome the limitations of conventional design and offer much better performance for controlling smaller particles. Such a platform may enable great potential in the applications of biological and diagnostic assays, for bioparticles smaller than the normal cell size.


Dual Effects Of Tisio4composite Nanoparticles On Dispersionstability And Lubrication Performance Of Vegetable Oil‐In‐Water Emulsions, Reza Taheri, Buyung Kosasih, Hongtao Zhu, Anh Kiet Tieu Jan 2019

Dual Effects Of Tisio4composite Nanoparticles On Dispersionstability And Lubrication Performance Of Vegetable Oil‐In‐Water Emulsions, Reza Taheri, Buyung Kosasih, Hongtao Zhu, Anh Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part B

Vegetable oil-in-water emulsions are potential metal-working lubricants. These emulsions are susceptible to oil-water phase separation due to the oil droplets' coalescence. In this study, we enhance the dispersion stability and lubricity of such emulsions with TiSiO4 nanoparticles (NPs). With 1 vol% soybean oil, stable emulsions are obtained with 0.25 to 0.75 wt% NPs, attributed to formation of shielding layers of NPs around the droplets. Lowest friction and wear are obtained without and with 0.25 wt% NPs, respectively. With increasing the NPs' mass fraction, NP-shielded droplets become less attracted to metal surfaces. Association of NPs within boundary film ...


Metamorphic Testing Of Driverless Cars, Zhi Q. Zhou, Liqun Sun Jan 2019

Metamorphic Testing Of Driverless Cars, Zhi Q. Zhou, Liqun Sun

Faculty of Engineering and Information Sciences - Papers: Part B

On March 18, 2018, Elaine Herzberg became the first pedestrian in the world to be killed by an autonomous vehicle after being hit by a self-driving Uber SUV in Tempe, AZ, at about 10 p.m. Video released by the local police department showed the self-driving Volvo XC90 did not appear to see Herzberg, as it did not slow down or alter course, even though she was visible in front of the vehicle prior to impact. Subsequently, automotive engineering experts raised questions about Uber's LiDAR technology.12 LiDAR, or "light detection and ranging," uses pulsed laser light to enable ...


Fringe Projection Profilometry For The 3d Shape Measurement Of Objects With Three-Dimensional Movements, Chengpu Duan, Yiwei Zhang, Jiangtao Xi, Jun Tong, Yanguang Yu, Qinghua Guo Jan 2019

Fringe Projection Profilometry For The 3d Shape Measurement Of Objects With Three-Dimensional Movements, Chengpu Duan, Yiwei Zhang, Jiangtao Xi, Jun Tong, Yanguang Yu, Qinghua Guo

Faculty of Engineering and Information Sciences - Papers: Part B

© 2019 SPIE. Phase shifting profilometry (PSP) is considered as an effective method for 3D shape measurement based on fringe projection. However, PSP is not suitable for dynamic measurement, as it requires that the object be kept still. Movement of the object during the cause of projection of multiple fringe patterns may lead to significant error in the measurement of the 3D shape. A number of approaches were proposed to combat this problem consisting of two steps: Capturing of the movement and then compensation (or correction) of fringe patterns. However, such compensation is only valid for the cases where the object ...


Large Expert-Curated Database For Benchmarking Document Similarity Detection In Biomedical Literature Search, Peter Brown, Relish Consortium, Yaoqi Zhou Jan 2019

Large Expert-Curated Database For Benchmarking Document Similarity Detection In Biomedical Literature Search, Peter Brown, Relish Consortium, Yaoqi Zhou

Faculty of Engineering and Information Sciences - Papers: Part B

Document recommendation systems for locating relevant literature have mostly relied on methods developed a decade ago. This is largely due to the lack of a large offline gold-standard benchmark of relevant documents that cover a variety of research fields such that newly developed literature search techniques can be compared, improved and translated into practice. To overcome this bottleneck, we have established the RElevant LIterature SearcH consortium consisting of more than 1500 scientists from 84 countries, who have collectively annotated the relevance of over 180 000 PubMed-listed articles with regard to their respective seed (input) article/s. The majority of annotations ...


Frequency Domain Characterization And Performance Bounds Of Alms Loop For Rf Self-Interference Cancellation, Anh Tuyen Le, Le Chung Tran, Xiaojing Huang, Y J. Guo, J (Yiannis) Vardaxoglou Jan 2019

Frequency Domain Characterization And Performance Bounds Of Alms Loop For Rf Self-Interference Cancellation, Anh Tuyen Le, Le Chung Tran, Xiaojing Huang, Y J. Guo, J (Yiannis) Vardaxoglou

Faculty of Engineering and Information Sciences - Papers: Part B

Analog Least Mean Square (ALMS) loop is a promising method to cancel self-interference (SI) in in-band fullduplex (IBFD) systems. In this paper, the steady state analyses of the residual SI powers in both analog and digital domains are firstly derived. Eigenvalue decomposition is then utilized to investigate the frequency domain characteristics of the ALMS loop. Our frequency domain analyses prove that the ALMS loop has an effect of amplifying the frequency components of the residual SI at the edges of the signal spectrum in the analog domain. However, the matched filter in the receiver chain will reduce this effect, resulting ...


Effects Of Ni And Cr On Cryogenic Impact Toughness Of Bainite/Martensite Multiphase Steels, Zishan Yao, Guang Xu, Zhengyi Jiang, Junyu Tian, Qing Yuan, Hongwei Ma Jan 2019

Effects Of Ni And Cr On Cryogenic Impact Toughness Of Bainite/Martensite Multiphase Steels, Zishan Yao, Guang Xu, Zhengyi Jiang, Junyu Tian, Qing Yuan, Hongwei Ma

Faculty of Engineering and Information Sciences - Papers: Part B

In the present research, the effects of Nickel (Ni) and Chromium (Cr) on cryogenic impact toughness (CIT) of low-carbon bainite/martensite multiphase steels [processed by two different cooling processes: isothermal transformation process (ITP) and continuous cooling process (CCP)] were investigated. It was found that due to the formation of carbides during isothermal treatment, the addition of Ni and Cr yielded no significant improvements in CIT. However, during CCP treatment, the addition of Ni manifested a considerable enhancement in CIT, whereas the addition of both Ni and Cr caused a decrease in CIT. Further, after ITP treatment, the microstructure of all ...


Modeling For Optical Feedback Laser Diode Operating In Period-One Oscillation And Its Application, Bin Liu, Yuxi Ruan, Yanguang Yu, Qinghua Guo, Jiangtao Xi, Jun Tong Jan 2019

Modeling For Optical Feedback Laser Diode Operating In Period-One Oscillation And Its Application, Bin Liu, Yuxi Ruan, Yanguang Yu, Qinghua Guo, Jiangtao Xi, Jun Tong

Faculty of Engineering and Information Sciences - Papers: Part B

An optical feedback laser diode (OFLD) operating in period-one oscillation (POO) with a moving external target is investigated by exploring its potential sensing capability. First, the modeling of an OFLD-POO sensing system is presented. An analytical expression is derived for OFLD-POO sensing signal, from which a new displacement measurement method is developed. The proposed sensing model is verified by the well-known Lang-Kobayashi equations used to describe the dynamic behavior of a laser with optical feedback. Then, an experimental OFLD-POO system is built in order to demonstrate an application example for displacement sensing. The measurement results show that the OFLD-POO sensing ...


Microstructure And Properties Of Spot Welded Joints Of Hot-Stamped Ultra-High Strength Steel Used For Automotive Body Structures, Zhixia Qiao, Hui Jun Li, Lianjin Li, Xiaoyu Ran, Liwen Feng Jan 2019

Microstructure And Properties Of Spot Welded Joints Of Hot-Stamped Ultra-High Strength Steel Used For Automotive Body Structures, Zhixia Qiao, Hui Jun Li, Lianjin Li, Xiaoyu Ran, Liwen Feng

Faculty of Engineering and Information Sciences - Papers: Part B

Hot-stamped ultra-high strength steels have been widely used in automobile structural parts. Considering the high splash tendency in resistance spot welding due to their extremely high hardness, in this work, microstructural characteristics and mechanical performance of the resistance spot welded ultra-high strength steels are investigated. The results indicate that the interface between the nugget and heat-affected zone (HAZ) is the weakest zone where fractures initiate. In tensile shearing tests, a qualified spot welding joint failed with a button-shaped fracture. Welding defects would significantly decrease the load-carrying capacity and lead to interfacial fracture, except for a button-shaped fracture. In spot welding ...