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Articles 61 - 90 of 1685
Full-Text Articles in Social and Behavioral Sciences
A Conductive Polymer Derived N-Doped Carbon Nanofiber Supported Li2s Coating Layer For Li–S Batteries With High Mass Loading, Fang Li, Chang Wu, Jicheng Jiang, Hua-Kun Liu, Jiazhao Wang
A Conductive Polymer Derived N-Doped Carbon Nanofiber Supported Li2s Coating Layer For Li–S Batteries With High Mass Loading, Fang Li, Chang Wu, Jicheng Jiang, Hua-Kun Liu, Jiazhao Wang
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 Elsevier B.V. The commercialization of Li2S as a potential candidate for lithium-sulfur cathode material is hampered due to its low electronic conductivity, the “shuttle effect” and the initial energy barrier. In this work, nanosized Li2S particles coated carbon nanofibers are prepared via a solution-based chemical method. Benefiting from this synthetic method, a uniform Li2S layer can be obtained without any agglomeration. Due to the small size of Li2S particles, a smaller energy barrier is observed in the first charging process, which means it is easier to activate the Li2S with a smaller cut-off voltage. In addition, the carbon …
Martensitic Wear Resistant Steels Alloyed With Titanium, Andrii Kostryzhev, C Killmore, D Yu, Elena V. Pereloma
Martensitic Wear Resistant Steels Alloyed With Titanium, Andrii Kostryzhev, C Killmore, D Yu, Elena V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part B
No abstract provided.
Reduction Kinetics Of Oxidized New Zealand Ironsand Pellets In H2 At Temperatures Up To 1443 K, Ao Zhang, Brian J. Monaghan, Raymond Longbottom, Mohammad Nusheh, Chris Bumby
Reduction Kinetics Of Oxidized New Zealand Ironsand Pellets In H2 At Temperatures Up To 1443 K, Ao Zhang, Brian J. Monaghan, Raymond Longbottom, Mohammad Nusheh, Chris Bumby
Faculty of Engineering and Information Sciences - Papers: Part B
2020, The Minerals, Metals & Materials Society and ASM International. Direct reduction of iron ore pellets using hydrogen gas has the potential to significantly reduce CO2 emissions from the ironmaking process. In this work, green pellets of titanomagnetite ironsand from New Zealand were oxidatively sintered to form titanohematite. These sintered pellets were then reduced by H2 gas at temperatures ≥ 1043 K, and a maximum reduction degree of ~ 97 pct was achieved. Fully reduced pellets contained metallic Fe as the main product phase, but several different (Fe, Ti) oxides were also present as minor inclusions. The phase distribution of …
Transient Nonlinear Heat Transfer Analysis Using A Generic Grid Refinement For Structure Parameter Variations, S Feng, Y Tao, Zhenjun Ma, Grzegorz Krolczyk, Zhixiong Li
Transient Nonlinear Heat Transfer Analysis Using A Generic Grid Refinement For Structure Parameter Variations, S Feng, Y Tao, Zhenjun Ma, Grzegorz Krolczyk, Zhixiong Li
Faculty of Engineering and Information Sciences - Papers: Part B
2020 The Authors Traditional finite element models are usually established based on specific structures to address the transient nonlinear heat transfer analysis; however, if the structure parameters change one has to reanalyze/rebuild the finite element models, resulting in a lot of additional computational cost. To address this problem, this work develops a generic grid refinement approach to improve the computational efficiency of nonlinear heat transfer analysis. The advantage of the proposed method lies that the grids can be used to establish connections between original and modified structures through transfer operators, which is calculated only once for the original structures and …
Thermodynamic Analysis Of A Solar-Driven High-Temperature Steam Electrolyzer For Clean Hydrogen Production, Wei He, Mohammad Namar, Zhixiong Li, Akbar Maleki, Iskander Tlili, Mostafa Safdari
Thermodynamic Analysis Of A Solar-Driven High-Temperature Steam Electrolyzer For Clean Hydrogen Production, Wei He, Mohammad Namar, Zhixiong Li, Akbar Maleki, Iskander Tlili, Mostafa Safdari
Faculty of Engineering and Information Sciences - Papers: Part B
2020 Elsevier Ltd Increasing world population and consequent increase in fossil fuels consumption emerge the necessity of looking for new sources of energy; resources that are clean, cheap, and renewable. Hydrogen is known as a clean and renewable fuel in various approaches; so, finding clean ways of hydrogen production can be considered as an appropriate solution for climate changes and global warming. In this study, a conceptual design of solar-driven high-temperature steam electrolyzer system is presented, and its performance is investigated thermodynamically using a real-time simulator in-house code. Evaluation of the effects of inlet parameters on the system performance is …
Thermo-Economic Selection Criteria Of Working Fluid Used In Dual-Loop Orc For Engine Waste Heat Recovery By Multi-Objective Optimization, Zhiqi Wang, Yanhua Hu, Xiaoxia Xia, Qingsong Zuo, Bin Zhao, Zhixiong Li
Thermo-Economic Selection Criteria Of Working Fluid Used In Dual-Loop Orc For Engine Waste Heat Recovery By Multi-Objective Optimization, Zhiqi Wang, Yanhua Hu, Xiaoxia Xia, Qingsong Zuo, Bin Zhao, Zhixiong Li
Faculty of Engineering and Information Sciences - Papers: Part B
2020 Elsevier Ltd The dual-loop organic Rankine cycle(DORC) is considered as an important way for engine waste heat recovery (WHR). Currently, researchers mainly focus on thermodynamic analysis and the performance comparison of multiple existing working fluid pairs without optimizing the working fluid pairs. Therefore, a novel analysis method of selection criteria based on thermodynamic and economic is provided to select a suitable working fluid using the multi-objective optimization. Firstly, a multi-objective optimization was performed using the Non-dominated sorting genetic algorithm-Ⅱ(NSGA-Ⅱ) to maximize exergy efficiency and minimize payback period under 24 candidate working fluid pairs from the references. And the Technical …
Flow Field Perception Of A Moving Carrier Based On An Artificial Lateral Line System, Guijie Liu, Huanhuan Hao, Tingting Yang, Shuikuan Liu, Mengmeng Wang, Atilla Incecik, Zhixiong Li
Flow Field Perception Of A Moving Carrier Based On An Artificial Lateral Line System, Guijie Liu, Huanhuan Hao, Tingting Yang, Shuikuan Liu, Mengmeng Wang, Atilla Incecik, Zhixiong Li
Faculty of Engineering and Information Sciences - Papers: Part B
2020 by the authors. Licensee MDPI, Basel, Switzerland. At present, autonomous underwater vehicles (AUVs) cannot perceive local environments in complex marine environments, where fish can obtain hydrodynamic information about the surrounding environment through a lateral line. Inspired by this biological function, an artificial lateral line system (ALLS) was built on a moving bionic carrier using the pressure sensor in this paper. When the carrier operated with different speeds in the flow field, the pressure distribution characteristics surrounding the carrier were analyzed by numerical simulation, where the effect of the flow angle between the fluid velocity direction and the carrier navigation …
Numerical Simulation Of Strip Shape Of High-Strength Steel During Hot Rolling Process, Lianjie Li, Haibo Xie, Xu Liu, Tianwu Liu, Enrui Wang, Zhengyi Jiang
Numerical Simulation Of Strip Shape Of High-Strength Steel During Hot Rolling Process, Lianjie Li, Haibo Xie, Xu Liu, Tianwu Liu, Enrui Wang, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
2020 Trans Tech Publications Ltd, Switzerland. High-strength steel is widely applied due to its excellent mechanical properties. However, its high strength in turn brings great difficulties to production and processing such as hot strip rolling owing to the high rolling force, which results in large elastic deformation of roll stack and poses a huge challenge to the control of strip crown and flatness. In this paper, A threedimensional (3D) elastic-plastic coupled thermo-mechanical finite element (FE) model for hot strip rolling of high-strength steel is developed and then verified experimentally. This model not only calculates the elastic deformation of rolls and …
Ultrathin Few-Layer Gep Nanosheets Via Lithiation-Assisted Chemical Exfoliation And Their Application In Sodium Storage, Fuhua Yang, Jian Hong, Junnan Hao, Shilin Zhang, Gemeng Liang, Jun Long, Yuqing Liu, Nana Liu, Wei Kong Pang, Jun Chen, Zaiping Guo
Ultrathin Few-Layer Gep Nanosheets Via Lithiation-Assisted Chemical Exfoliation And Their Application In Sodium Storage, Fuhua Yang, Jian Hong, Junnan Hao, Shilin Zhang, Gemeng Liang, Jun Long, Yuqing Liu, Nana Liu, Wei Kong Pang, Jun Chen, Zaiping Guo
Faculty of Engineering and Information Sciences - Papers: Part B
2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Ultrathin few-layer materials have attracted intensive research attention because of their distinctive and unique properties. Few-layer GeP (FL-GP) is potentially interesting for application in electronics and optoelectronics because of its appropriate band gap and good stability under ambient conditions. Nevertheless, it is a challenge to achieve ultrathin few-layer or single layer GeP from exfoliation of bulk crystals. Here, a lithiation-assisted chemical exfoliation technique is employed to achieve FL-GP, in which the interlayer spacing can be efficiently enlarged after a preliminary lithium ion intercalation, allowing the bulk crystal to be readily exfoliated in …
Social Vulnerability To Natural Hazards In Wollongong: Comparing Strength-Based And Traditional Methods, Robert Ighodaro Ogie, Biswajeet Pradhan
Social Vulnerability To Natural Hazards In Wollongong: Comparing Strength-Based And Traditional Methods, Robert Ighodaro Ogie, Biswajeet Pradhan
Faculty of Engineering and Information Sciences - Papers: Part B
Social vulnerability is a widely recognised way of assessing the sensitivity of a population to natural hazards and its ability to respond to and recover from them. In the traditional approach to computing social vulnerability, the emphasis is mainly on the weaknesses only (e.g. old age, low income, language barriers). This study presents a strength-based social vulnerability index that identifies the strengths that communities have that help minimise disaster risk exposure. The strength-based social vulnerability index method is compared with the traditional approach using various statistical procedures like the one-sample T-test and the Wilcoxon signed rank test. This is performed …
Attention-Based Residual Network With Scattering Transform Features For Hyperspectral Unmixing With Limited Training Samples, Yiliang Zeng, Christian H. Ritz, Jiahong Zhao, Jinhui Lan
Attention-Based Residual Network With Scattering Transform Features For Hyperspectral Unmixing With Limited Training Samples, Yiliang Zeng, Christian H. Ritz, Jiahong Zhao, Jinhui Lan
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 by the authors. This paper proposes a framework for unmixing of hyperspectral data that is based on utilizing the scattering transform to extract deep features that are then used within a neural network. Previous research has shown that using the scattering transform combined with a traditional K-nearest neighbors classifier (STFHU) is able to achieve more accurate unmixing results compared to a convolutional neural network (CNN) applied directly to the hyperspectral images. This paper further explores hyperspectral unmixing in limited training data scenarios, which are likely to occur in practical applications where the access to large amounts of labeled …
Sparsity-Based Robust Bistatic Mimo Radar Imaging In The Presence Of Array Errors, Wenyu Gao, Jun Li, Daming Zhang, Qinghua Guo
Sparsity-Based Robust Bistatic Mimo Radar Imaging In The Presence Of Array Errors, Wenyu Gao, Jun Li, Daming Zhang, Qinghua Guo
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 Wenyu Gao et al. A sparse recovery method for robust transmit-receive angle imaging in a bistatic MIMO radar is proposed to deal with the effect of array gain-phase errors. The impact of multiplicative array gain-phase errors is changed to be additive through model reformulation, and transmit-receive angle imaging is formulated to a sparse total least square signal problem. Then, an iterative algorithm is proposed to solve the optimization problem. Compared with existing methods, the proposed method can achieve a significant performance gain in the case that the number of snapshots is small. Simulation results verify the effectiveness of …
Wet-Spun Trojan Horse Cell Constructs For Engineering Muscle, Anita Quigley, Rhys Cornock, Tharun Mysore, Javad Foroughi, Magdalena Kita, Joselito Razal, Jeremy Micah Crook, Simon Moulton, Gordon G. Wallace, Robert Kapsa
Wet-Spun Trojan Horse Cell Constructs For Engineering Muscle, Anita Quigley, Rhys Cornock, Tharun Mysore, Javad Foroughi, Magdalena Kita, Joselito Razal, Jeremy Micah Crook, Simon Moulton, Gordon G. Wallace, Robert Kapsa
Faculty of Engineering and Information Sciences - Papers: Part B
© Copyright © 2020 Quigley, Cornock, Mysore, Foroughi, Kita, Razal, Crook, Moulton, Wallace and Kapsa. Engineering of 3D regenerative skeletal muscle tissue constructs (skMTCs) using hydrogels containing muscle precursor cells (MPCs) is of potential benefit for repairing Volumetric Muscle Loss (VML) arising from trauma (e.g., road/industrial accident, war injury) or for restoration of functional muscle mass in disease (e.g., Muscular Dystrophy, muscle atrophy). Additive Biofabrication (AdBiofab) technologies make possible fabrication of 3D regenerative skMTCs that can be tailored to specific delivery requirements of VML or functional muscle restoration. Whilst 3D printing is useful for printing constructs of many tissue types, …
Dtn And Non-Dtn Routing Protocols For Inter-Cubesat Communications: A Comprehensive Survey, Mohamed Atef Madni, Saeid Iranmanesh, Raad Raad
Dtn And Non-Dtn Routing Protocols For Inter-Cubesat Communications: A Comprehensive Survey, Mohamed Atef Madni, Saeid Iranmanesh, Raad Raad
Faculty of Engineering and Information Sciences - Papers: Part B
CubeSats, which are limited by size and mass, have limited functionality. These miniaturised satellites suffer from a low power budget, short radio range, low transmission speeds, and limited data storage capacity. Regardless of these limitations, CubeSats have been deployed to carry out many research missions, such as gravity mapping and the tracking of forest fires. One method of increasing their functionality and reducing their limitations is to form CubeSat networks, or swarms, where many CubeSats work together to carry out a mission. Nevertheless, the network might have intermittent connectivity and, accordingly, data communication becomes challenging in such a disjointed network …
A Judicious Decision-Making Approach For Power Dispatch In Smart Grid Using A Multiobjective Evolutionary Algorithm Based On Decomposition, Chixin Xiao, Danny Sutanto, Kashem M. Muttaqi, Minjie Zhang
A Judicious Decision-Making Approach For Power Dispatch In Smart Grid Using A Multiobjective Evolutionary Algorithm Based On Decomposition, Chixin Xiao, Danny Sutanto, Kashem M. Muttaqi, Minjie Zhang
Faculty of Engineering and Information Sciences - Papers: Part B
Multiobjective evolutionary algorithm based on decomposition (MOEA/D) is an efficient mathematical strategy for solving multiobjective optimization problems. However, the MOEA/D algorithm has not yet been widely used on the multiobjective optimal power flow (MOPF) problems, which consider several conflicting objectives with varying tradeoff levels. This article proposes a novel differential evolution (DE) strategy based on the MOEA/D framework to quickly determine a set of optimal solutions of MOPFs, in the objective space formed from the different objectives, such as the most optimal economic dispatch, the least environmental emission objectives, and the minimum transmission losses, while considering the power system constraints. …
A Magnetic-Linked Multilevel Active Neutral Point Clamped Converter With An Advanced Switching Technique For Grid Integration Of Solar Photovoltaic Systems, A M. Mahfuz-Ur-Rahman, Md Rabiul Islam, Kashem M. Muttaqi, Danny Sutanto
A Magnetic-Linked Multilevel Active Neutral Point Clamped Converter With An Advanced Switching Technique For Grid Integration Of Solar Photovoltaic Systems, A M. Mahfuz-Ur-Rahman, Md Rabiul Islam, Kashem M. Muttaqi, Danny Sutanto
Faculty of Engineering and Information Sciences - Papers: Part B
© 1972-2012 IEEE. Nowadays, the grid-connected solar photovoltaic (PV) system has been drawing significant attention due to the rapid development and the decreasing cost of solar panels. The efficiency and reliability of a grid-connected PV system mainly depend on the power conversion system and the control strategy. This article presents a new magnetic-linked 7-level active neutral point clamped (ANPC) converter, which requires less number of flying capacitors and also reduces the control complexity of the grid-connected PV system. The proposed converter topology utilizes the input dc bus voltage better than the traditional ANPC multilevel converter and also provides galvanic isolation …
On The Energy Efficiency Of Massive Mimo Systems With Low-Resolution Adcs And Lattice Reduction Aided Detectors, Zhitao Xiao, Jincan Zhao, Tianle Liu, Lei Geng, Fang Zhang, Jun Tong
On The Energy Efficiency Of Massive Mimo Systems With Low-Resolution Adcs And Lattice Reduction Aided Detectors, Zhitao Xiao, Jincan Zhao, Tianle Liu, Lei Geng, Fang Zhang, Jun Tong
Faculty of Engineering and Information Sciences - Papers: Part B
As an effective technology for boosting the performance of wireless communications, massive multiple-input multiple-output (MIMO) systems based on symmetric antenna arrays have been extensively studied. Using low-resolution analog-to-digital converters (ADCs) at the receiver can greatly reduce hardware costs and circuit complexity to further improve the energy efficiency (EE) of the system. There are significant research on the design of MIMO detectors but there is limited study on their performance in terms of EE. This paper studies the effect of signal detection on the EE in practical systems, and proposes to apply several signal detectors based on lattice reduction successive interference …
An Integrated Energy Management Approach For The Economic Operation Of Industrial Microgrids Under Uncertainty Of Renewable Energy, Ghulam Mohy-Ud-Din, Dao Hoang Vu, Kashem M. Muttaqi, Danny Sutanto
An Integrated Energy Management Approach For The Economic Operation Of Industrial Microgrids Under Uncertainty Of Renewable Energy, Ghulam Mohy-Ud-Din, Dao Hoang Vu, Kashem M. Muttaqi, Danny Sutanto
Faculty of Engineering and Information Sciences - Papers: Part B
© 1972-2012 IEEE. Many modern industries are equipped with onsite renewable generation and are normally connected to the grid. A battery energy storage system (BESS) can complement the intermittency of the available onsite renewable generation. The combination of the BESS and the renewable generation can operate as a microgrid. If the microgrid is properly sized and managed, it is possible to reduce the electricity bill to have a huge saving in the electricity cost. This article proposes an energy management system for such an industrial microgrids. The decisions to charge and discharge the BESS in the proposed energy management are …
Upright Radiation Therapy—A Historical Reflection And Opportunities For Future Applications, Sulman Rahim, James Korte, Nicholas G. Hardcastle, Sarah Hegarty, Tomas Kron, Sarah Everitt
Upright Radiation Therapy—A Historical Reflection And Opportunities For Future Applications, Sulman Rahim, James Korte, Nicholas G. Hardcastle, Sarah Hegarty, Tomas Kron, Sarah Everitt
Faculty of Engineering and Information Sciences - Papers: Part B
Since the early days of megavoltage Radiation Therapy (RT), the potential of delivering treatment to a sub group of patients in an upright position has been recognized. Compared to lying horizontally, treating patients in an upright position offers potential benefits in terms of patient comfort especially for patients experiencing dyspnoea and saliva accumulation when lying down. Dosimetric benefits can also be gained from changes in the volume and location of lungs and heart in an upright position, which are potentially advantageous for clinical situations including Hodgkin's disease, lung and breast malignancies. Since the 1950's, upright stabilization mechanisms have ranged from …
A Decentralized Latency-Aware Task Allocation And Group Formation Approach With Fault Tolerance For Iot Applications, Muhammad Mudassar, Yanlong Zhai, Lejian Liao, Jun Shen
A Decentralized Latency-Aware Task Allocation And Group Formation Approach With Fault Tolerance For Iot Applications, Muhammad Mudassar, Yanlong Zhai, Lejian Liao, Jun Shen
Faculty of Engineering and Information Sciences - Papers: Part B
Development of internet of things (IoT) and smart devices eased life by offering numerous applications targeting to provide real-time low latency services, but they also brought challenges in handling huge data generated from the powerful computations, to get a job done. Decentralized edge computing could help to achieve latency requirements of the applications by executing them closer to the user at edge of network, but most of the current studies actually deployed centralized approaches for cluster computing at edge, which put extra overhead of cluster formation and management. In this article, we propose to group heterogeneous edge nodes on task …
Barriers And Facilitators That Influence Telemedicine-Based, Real-Time, Online Consultation At Patients' Homes: Systematic Literature Review, Hassan Almathami, Khin Than Win, Elena Vlahu-Gjorgievska
Barriers And Facilitators That Influence Telemedicine-Based, Real-Time, Online Consultation At Patients' Homes: Systematic Literature Review, Hassan Almathami, Khin Than Win, Elena Vlahu-Gjorgievska
Faculty of Engineering and Information Sciences - Papers: Part B
©Hassan Khader Y Almathami, Khin Than Win, Elena Vlahu-Gjorgievska. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 20.02.2020. BACKGROUND: Health care providers are adopting information and communication technologies (ICTs) to enhance their services. Telemedicine is one of the services that rely heavily on ICTs to enable remote patients to communicate with health care professionals; in this case, the patient communicates with the health care professional for a follow-up or for a consultation about his or her health condition. This communication process is referred to as an e-consultation. In this paper, telemedicine services refer to health care services that …
Attribute-Based Equality Test Over Encrypted Data Without Random Oracles, Yuanhao Wang, Yuzhao Cui, Qiong Huang, Hongbo Li, Jianye Huang, Guomin Yang
Attribute-Based Equality Test Over Encrypted Data Without Random Oracles, Yuanhao Wang, Yuzhao Cui, Qiong Huang, Hongbo Li, Jianye Huang, Guomin Yang
Faculty of Engineering and Information Sciences - Papers: Part B
© 2013 IEEE. Sensitive data would be encrypted before uploading to the cloud due to the privacy issue. However, how to compare the encrypted data efficiently becomes a problem. Public Key Encryption with Equality Test (PKEET) provides an efficient way to check whether two ciphertexts (of possibly different users) contain the same message without decryption. As an enhanced variant, Attribute-based Encryption with Equality Test (ABEET) provides a flexible mechanism of authorization on the equality test. Most of the existing ABEET schemes are only proved to be secure in the random oracle model. Their security, however, would not be guaranteed if …
The Contribution Of Electronic Health Records To Risk Management Through Accreditation Of Residential Aged Care Homes In Australia, Ping Yu, Tao Jiang, David M. Hailey, Jun Ma, Siyu Qian
The Contribution Of Electronic Health Records To Risk Management Through Accreditation Of Residential Aged Care Homes In Australia, Ping Yu, Tao Jiang, David M. Hailey, Jun Ma, Siyu Qian
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 The Author(s). Background: The Australian government has implemented a compulsory aged care accreditation system to guide and monitor the risk management approach in registered residential aged care (RAC) homes. This research assessed the contribution of electronic health records (EHR) to risk management in RAC homes in relation to the extent that aged care accreditation fulfils its role. Methods: A convenience sample of 5560 aged care accreditation reports published from 2011 to 2018 was manually downloaded from the Accreditation Agency web site. A mixed-method approach of text data mining and manual content analysis was used to identify any significant …
Numerical Modelling Of Track Behavior Capturing Particle Breakage Under Dynamic Loading, Ngoc Trung Ngo, Buddhima Indraratna
Numerical Modelling Of Track Behavior Capturing Particle Breakage Under Dynamic Loading, Ngoc Trung Ngo, Buddhima Indraratna
Faculty of Engineering and Information Sciences - Papers: Part B
No abstract provided.
Advancement Of Rail Ballast Testing Methodologies And Design Implications, Buddhima Indraratna, Ngoc Trung Ngo, Cholachat Rujikiatkamjorn, Fernanda Ferreira
Advancement Of Rail Ballast Testing Methodologies And Design Implications, Buddhima Indraratna, Ngoc Trung Ngo, Cholachat Rujikiatkamjorn, Fernanda Ferreira
Faculty of Engineering and Information Sciences - Papers: Part B
Given the limited capacity of available railway tracks in Australia to sustain increasingly faster and heavier trains, the development of innovative and sustainable ballasted tracks is essential for Australian transport infrastructure. Upon repeated train loading, ballast aggregates become degraded and fouled owing to the intrusion of external fines either from the subbase or surface, which decreases track drainage potentially leading to track instability. This paper reviews some advancements in testing methodologies and design implications of ballasted tracks stabilized with artificial inclusions, including geocomposites, energy absorbing rubber mats and end-of-life tires. Measured test data shows that the use of these waste …
Effect Of Rock Brittleness On Propagation Of Hydraulic Fractures In Shale Reservoirs With Bedding-Planes, Zhaohui Chong, Qiangling Yao, Xuehua Li, Liu Zhu, Chuanjin Tang
Effect Of Rock Brittleness On Propagation Of Hydraulic Fractures In Shale Reservoirs With Bedding-Planes, Zhaohui Chong, Qiangling Yao, Xuehua Li, Liu Zhu, Chuanjin Tang
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 The Authors. Energy Science & Engineering published by the Society of Chemical Industry and John Wiley & Sons Ltd. Hydraulic fracturing forms complex hydraulic fracture networks (HFNs) in shale reservoirs and significantly improves the permeability of shale reservoirs. Although rock brittleness is a major factor in determining whether a shale reservoir can be fractured, the relationship between HFNs and rock brittleness remains unclear. To investigate this relationship in a shale reservoir with bedding planes, this paper presents a series of hydraulic fracturing simulations based on a hydromechanically coupled discrete element model. In addition, we analyzed the sensitivity of …
Biogeochemical Clogging Of Permeable Reactive Barriers In Acid-Sulfate Soil Floodplain, Buddhima Indraratna, Subhani Medawela, R Rowe, Ngamta Thamwattana, Ana Heitor
Biogeochemical Clogging Of Permeable Reactive Barriers In Acid-Sulfate Soil Floodplain, Buddhima Indraratna, Subhani Medawela, R Rowe, Ngamta Thamwattana, Ana Heitor
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 American Society of Civil Engineers. Column experiments that investigate the use of calcitic limestone as a potential material for permeable reactive barriers (PRBs), as well as its clogging behavior, are conducted under conditions that involve continuous acidic flow containing Al, Fe, and acidophilic bacteria. Results show that nonhomogenous biogeochemical clogging occurred toward the outlet, resulting in a 45% reduction of hydraulic conductivity at the inlet and 10% reduction at the outlet after the bicarbonate buffering period. A mathematical model developed to capture the reductions in longevity is presented. The model, which considers the effects of time-varying porosity, hydraulic …
Flexural Fatigue Behaviour Of Geogrid Reinforced Concrete Pavements, Muhammad N. S Hadi, Abbas Sahib Abd-Ali Al-Hedad
Flexural Fatigue Behaviour Of Geogrid Reinforced Concrete Pavements, Muhammad N. S Hadi, Abbas Sahib Abd-Ali Al-Hedad
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 Elsevier Ltd This paper investigates the effect of geogrid reinforcement on the flexural fatigue behaviour of concrete pavements subjected to cyclic loads. Fifteen-notched concrete beam specimens with the dimensions of 150 × 150 × 550 mm were either unreinforced, reinforced with a single or a double geogrid layer. The geogrid was placed at a depth of 55 mm from the bottom of the specimen. The specimens were tested under cyclic four-point bending loads at a frequency of 7 Hz. Test results illustrate that significant improvement was achieved in the flexural strength and fracture energy of the concrete specimens …
Cross-Aisle Seismic Performance Of Selective Storage Racks, James Maguire, Lip H. Teh, G Clifton, Z Tang, James Lim
Cross-Aisle Seismic Performance Of Selective Storage Racks, James Maguire, Lip H. Teh, G Clifton, Z Tang, James Lim
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 A series of single-axis shaking table tests were conducted on three full-scale selective storage racks in the cross-aisle direction. The uplifting and rocking behaviour of the racks was examined under three baseplate types: ductile, heavy duty, and unanchored. Each rack was subjected to a sequence of ground motions of increasing intensity up to failure, with a total of 29 tests conducted. At 1.5 times the respective design level ground motions, the heavy duty baseplates caused a foundation failure while the unanchored rack failed by overturning. The rack with ductile baseplates survived all tests up to 2.3 times the …
Computational Simulation Of Eccentrically Loaded Circular Thin-Walled Concrete-Filled Double Steel Tubular Slender Columns, Mizan Ahmed, Qing Liang, Vipulkumar Patel, Muhammad N. S Hadi
Computational Simulation Of Eccentrically Loaded Circular Thin-Walled Concrete-Filled Double Steel Tubular Slender Columns, Mizan Ahmed, Qing Liang, Vipulkumar Patel, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
The concrete confinement provided by the circular steel tubes improves the performance of circular concretefilled double steel tubular (CFDST) columns, which have increasingly been employed as high-performance structural members in tall buildings. This paper presents computational and design models for the simulation and design of high strength CFDST slender columns composed of circular thin-walled sections that are eccentrically loaded. The formulation of the computational model is described, which takes into account the influences of concrete confinement, geometric imperfection, second-order, gradual plasticity of steel, and geometric and material nonlinearities. The inverse quadratic method is implemented in computational algorithms which solve the …