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Articles 691 - 720 of 2936
Full-Text Articles in Social and Behavioral Sciences
Numerical Modelling Capturing The Behaviour Of Reinforced Soft Ground For Public Transport Infrastructure, Sudip Basack, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Numerical Modelling Capturing The Behaviour Of Reinforced Soft Ground For Public Transport Infrastructure, Sudip Basack, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part A
Foundations on soft soil without proper ground improvement can initiate excessive settlement causing undrained failure of infrastructure. Amongst various ground improvement techniques, reinforcement by stone columns is one of the convenient and effective methods, with numerous advantages including: increased bearing capacity, reduced settlement, improved slope stability and liquefaction control. The stone columns not only act as vertical stiffening members increasing the overall bearing capacity of soft ground while reducing the overall settlement, they also assist in effective radial consolidation. The existing analytical and numerical solutions to predict the behaviour of reinforced soft ground, the models are based on equal strain …
Evaluation Of Coalwash As A Potential Structural Fill Material For Port Reclamation, Chazath Kaliboullah, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Ana Heitor
Evaluation Of Coalwash As A Potential Structural Fill Material For Port Reclamation, Chazath Kaliboullah, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Ana Heitor
Faculty of Engineering and Information Sciences - Papers: Part A
Coalwash is a granular waste by-product that results from the processing of coal. While its potential use as fill material for port reclamation has been recognised, the effect of particle breakage on its geomechanical performance has not been investigated. This paper presents an experimental study of the stress-strain behaviour and associated breakage of compacted coalwash. The characterization of basic index properties is first presented and stress-strain response is investigated using standard undrained triaxial tests over a wide range of effective confining stresses in line with the expected performance criteria of structural fill materials for port reclamation. Furthermore, to account for …
Shear Strength And Dilatancy Behaviour Of Sand-Tyre Chip Mixtures, M S. Mashiri, J S. Vinod, M Neaz Sheikh, Hing-Ho Tsang
Shear Strength And Dilatancy Behaviour Of Sand-Tyre Chip Mixtures, M S. Mashiri, J S. Vinod, M Neaz Sheikh, Hing-Ho Tsang
Faculty of Engineering and Information Sciences - Papers: Part A
Sand-tyre chip (STCh) mixtures can be used in many geotechnical applications as alternative backfill material. The reuse of scrap tyres in STCh mixtures can effectively address growing environmental concerns and, at the same time, provide solutions to geotechnical problems associated with low soil shear strength and high dilatancy. In this paper, the shear strength and dilatancy behaviour of STCh mixtures have been investigated. A series of monotonic triaxial tests has been carried out on sand mixed with various proportions of tyre chips. It has been found that tyre chips significantly influence the shear strength and the dilatancy behaviour of STCh …
Trace Organic Contaminants In Biosolids: Impact Of Conventional Wastewater And Sludge Processing Technologies And Emerging Alternatives, Galilee U. Semblante, Faisal I. Hai, Xia Huang, Andrew S. Ball, William E. Price, Long D. Nghiem
Trace Organic Contaminants In Biosolids: Impact Of Conventional Wastewater And Sludge Processing Technologies And Emerging Alternatives, Galilee U. Semblante, Faisal I. Hai, Xia Huang, Andrew S. Ball, William E. Price, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This paper critically reviews the fate of trace organic contaminants (TrOCs) in biosolids, with emphasis on identifying operation conditions that impact the accumulation of TrOCs in sludge during conventional wastewater and sludge treatment and assessing the technologies available for TrOC removal from biosolids. The fate of TrOCs during sludge thickening, stabilisation (e.g. aerobic digestion, anaerobic digestion, alkaline stabilisation, and composting), conditioning, and dewatering is elucidated. Operation pH, sludge retention time (SRT), and temperature have significant impact on the sorption and biodegradation of TrOCs in activated sludge that ends up in the sludge treatment line. Anaerobic digestion may exacerbate the estrogenicity …
The Investigation Of Prostatic Calcifications Using Μ-Pixe Analysis And Their Dosimetric Effect In Low Dose Rate Brachytherapy Treatments Using Geant4, D J. Pope, D L. Cutajar, S P. George, S Guatelli, J A. Bucci, K E. Enari, S Miller, R Siegele, A B. Rosenfeld
The Investigation Of Prostatic Calcifications Using Μ-Pixe Analysis And Their Dosimetric Effect In Low Dose Rate Brachytherapy Treatments Using Geant4, D J. Pope, D L. Cutajar, S P. George, S Guatelli, J A. Bucci, K E. Enari, S Miller, R Siegele, A B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
Low dose rate brachytherapy is a widely used modality for the treatment of prostate cancer. Most clinical treatment planning systems currently in use approximate all tissue to water, neglecting the existence of inhomogeneities, such as calcifications. The presence of prostatic calcifications may perturb the dose due to the higher photoelectric effect cross section in comparison to water. This study quantitatively evaluates the effect of prostatic calcifications on the dosimetric outcome of brachytherapy treatments by means of Monte Carlo simulations and its potential clinical consequences. Four pathological calcification samples were characterised with micro-particle induced x-ray emission (μ-PIXE) to determine their heavy …
Development Of A Novel Variable Stiffness And Damping Magnetorheological Fluid Damper, Shuaishuai Sun, Jian Yang, Weihua Li, Huaxia Deng, Haiping Du, Gursel Alici
Development Of A Novel Variable Stiffness And Damping Magnetorheological Fluid Damper, Shuaishuai Sun, Jian Yang, Weihua Li, Huaxia Deng, Haiping Du, Gursel Alici
Faculty of Engineering and Information Sciences - Papers: Part A
This paper reports a novel magnetorheological fluid (MRF)-based damper, which synergizes the attributes of variable stiffness and damping through the compact assembly of two MRF damping units and a spring. The magnetic field densities of the two damping units were analyzed. After the prototype of the new MRF damper, a hydraulically actuated MTS machine was used to test the damper's performance, including stiffness variability and damping variability, amplitudedependent responses and frequency-dependent responses. A new mathematical model was developed to describe the variable stiffness and damping MRF damper. The successful development, experimental testing and modeling of this innovative variable stiffness and …
Carbothermal Reduction Of Quartz In Methane-Hydrogen-Argon Gas Mixture, Xiang Li, Guangqing Zhang, Kai Tang, Oleg Ostrovski, Ragnar Tronstad
Carbothermal Reduction Of Quartz In Methane-Hydrogen-Argon Gas Mixture, Xiang Li, Guangqing Zhang, Kai Tang, Oleg Ostrovski, Ragnar Tronstad
Faculty of Engineering and Information Sciences - Papers: Part A
Synthesis of silicon carbide (SiC) by carbothermal reduction of quartz in a CH4-H2-Ar gas mixture was investigated in a laboratory fixed-bed reactor in the temperature range of 1573 K to 1823 K (1300 °C to 1550 °C). The reduction process was monitored by an infrared gas analyser, and the reduction products were characterized by LECO, XRD, and SEM. A mixture of quartz-graphite powders with C/SiO2 molar ratio of 2 was pressed into pellets and used for reduction experiments. The reduction was completed within 2 hours under the conditions of temperature at or above 1773 K (1500 °C), methane content of …
Simulation Study Of Dose Enhancement In A Cell Due To Nearby Carbon And Oxygen In Particle Radiotherapy, Jae Ik Shin, Ilsung Cho, Sungho Cho, Eun Ho Kim, Yongkeun Song, Won-Gyun Jung, Seunghoon Yoo, Dongho Shin, Se Byeong Lee, Myonggeun Yoon, Sebastian Incerti, Moshi Geso, Anatoly B. Rosenfeld
Simulation Study Of Dose Enhancement In A Cell Due To Nearby Carbon And Oxygen In Particle Radiotherapy, Jae Ik Shin, Ilsung Cho, Sungho Cho, Eun Ho Kim, Yongkeun Song, Won-Gyun Jung, Seunghoon Yoo, Dongho Shin, Se Byeong Lee, Myonggeun Yoon, Sebastian Incerti, Moshi Geso, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
The aim of this study is to investigate the dose-deposition enhancement by alpha-particle irradiation in a cellular model using carbon and oxygen chemical compositions. A simulation study was performed to study dose enhancement due to carbon and oxygen for a human cell where Geant4 code used for the alpha-particle irradiation to the cellular phantom. The characteristic of dose enhancement in the nucleus and cytoplasm by the alpha-particle radiation was investigated based on concentrations of the carbon and oxygen compositions and was compared with those by gold and gadolinium.The results show that both the carbon and oxygen-induced dose enhancement was found …
Model Of Soft Soils Under Cyclic Loading, Jing Ni, Buddhima Indraratna, Xue-Yu Geng, John Philip Carter, You-Liang Chen
Model Of Soft Soils Under Cyclic Loading, Jing Ni, Buddhima Indraratna, Xue-Yu Geng, John Philip Carter, You-Liang Chen
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a new constitutive model for cyclic loading of soil to predict the behavior of soft clays under undrained cyclic triaxial loading. It is inspired by the modified Cam-clay theory, and a new yield surface for elastic unloading is proposed to capture the soil behavior under cyclic loading. Only two additional parameters that characterize the cyclic behavior are used together with the traditional parameters associated with the modified Cam-clay constitutive model. The details of the relevant soil properties, initial states, and cyclic loading conditions are presented, and a computational procedure for determining the effective stresses and strains is …
On The Uniqueness Of Lp-Minkowski Problems: The Constant P-Curvature Case In R^3, Yong Huang, Jiakun Liu, Lu Xu
On The Uniqueness Of Lp-Minkowski Problems: The Constant P-Curvature Case In R^3, Yong Huang, Jiakun Liu, Lu Xu
Faculty of Engineering and Information Sciences - Papers: Part A
We study the C4 smooth convex bodies K ⊂Rn+1 satisfying K(x) =u(x)1−p, where x ∈Sn, K is the Gauss curvature of ∂K, u is the support function of K, and p is a constant. In the case of n =2, either when p ∈[−1, 0] or when p ∈(0, 1) in addition to a pinching condition, we show that K must be the unit ball. This partially answers a conjecture of Lutwak, Yang, and Zhang about the uniqueness of the Lp-Minkowski problem in R3. Moreover, we give an explicit pinching constant depending only on p when p ∈(0, 1).
Development Of Servo-Type Micro-Hydromechanical Deep-Drawing Apparatus And Micro Deep-Drawing Experiments Of Circular Cups, Hideki Sato, Kenichi Manabe, Kikukatsu Ito, Dongbin Wei, Zhengyi Jiang
Development Of Servo-Type Micro-Hydromechanical Deep-Drawing Apparatus And Micro Deep-Drawing Experiments Of Circular Cups, Hideki Sato, Kenichi Manabe, Kikukatsu Ito, Dongbin Wei, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part A
A micro-hydromechanical deep-drawing (MHDD) apparatus for manufacturing a micro-complex-shape components and increasing of drawn cup accuracy has been developed in this study. This apparatus with simple tooling structure and forming process can achieve high dimensional accuracy using servo press mechanics with a double-action type, one-stroke forming process without transferring and positioning, force control, and fine flow rate control of the pressure medium. The developed MHDD apparatus can prevent wrinkling by applying an appropriate constant gap and Stably generate the counterpressure. Micro drawn cups of 0.8 mm diameter are successfully fabricated. Also, the effects of counterpressure on drawability and dimensional accuracy …
Study Of The Consequences Of Co2 Released From High-Pressure Pipelines, Xiong Liu, Ajit R. Godbole, Cheng Lu, Guillaume Michal, Phillip Venton
Study Of The Consequences Of Co2 Released From High-Pressure Pipelines, Xiong Liu, Ajit R. Godbole, Cheng Lu, Guillaume Michal, Phillip Venton
Faculty of Engineering and Information Sciences - Papers: Part A
The development of the Carbon Capture and Storage (CCS) technique requires an understanding of the hazards posed by the operation of high-pressure CO2 pipelines. To allow the appropriate safety precautions to be taken, a comprehensive understanding of the consequences of unplanned CO2 releases is essential before the deployment of CO2 pipelines. In this paper, we present models for the predictions of discharge rate, atmospheric expansion and dispersion due to accidental CO2 releases from high-pressure pipelines. The GERG-2008 Equation of State (EOS) was used in the discharge and expansion models. This enabled more precise 'source strength' predictions. …
Dean-Flow-Coupled Elasto-Inertial Three-Dimensional Particle Focusing Under Viscoelastic Flow In A Straight Channel With Asymmetrical Expansion-Contraction Cavity Arrays, Dan Yuan, Jie Zhang, Sheng Yan, Chao Pan, Gursel Alici, Nam-Trung Nguyen, Weihua Li
Dean-Flow-Coupled Elasto-Inertial Three-Dimensional Particle Focusing Under Viscoelastic Flow In A Straight Channel With Asymmetrical Expansion-Contraction Cavity Arrays, Dan Yuan, Jie Zhang, Sheng Yan, Chao Pan, Gursel Alici, Nam-Trung Nguyen, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, 3D particle focusing in a straight channel with asymmetrical expansion-contraction cavity arrays (ECCA channel) is achieved by exploiting the dean-flow-coupled elasto-inertial effects. First, the mechanism of particle focusing in both Newtonian and non-Newtonian fluids was introduced. Then particle focusing was demonstrated experimentally in this channel with Newtonian and non- Newtonian fluids using three different sized particles (3.2 lm, 4.8 lm, and 13 lm), respectively. Also, the effects of dean flow (or secondary flow) induced by expansion- contraction cavity arrays were highlighted by comparing the particle distributions in a single straight rectangular channel with that in the ECCA …
Osmotic Dilution For Sustainable Greenwall Irrigation By Liquid Fertilizer: Performance And Implications, Ming Xie, Mingxin Zheng, Paul Cooper, William E. Price, Long D. Nghiem, Menachem Elimelech
Osmotic Dilution For Sustainable Greenwall Irrigation By Liquid Fertilizer: Performance And Implications, Ming Xie, Mingxin Zheng, Paul Cooper, William E. Price, Long D. Nghiem, Menachem Elimelech
Faculty of Engineering and Information Sciences - Papers: Part A
A novel osmotic dilution process using commercial liquid fertilizer for greenwall irrigation was evaluated. In this process, clean water was extracted from raw sewage by forward osmosis (FO) using a well-balanced, all-purpose commercial liquid fertilizer as draw solution. The diluted liquid fertilizer can then be used for direct sustainable greenwall irrigation. Our results show that the presence of organic matter in the liquid fertilizer draw solution did not compromise FO membrane performance. No discernible changes in water flux and key membrane transport parameters (pure water permeability coefficient, A, and salt (NaCl) permeability coefficient, B) were observed when the organic matter …
An Integrated Dielectrophoresis-Active Hydrophoretic Microchip For Continuous Particle Filtration And Separation, Sheng Yan, Jun Zhang, Chao Pan, Dan Yuan, Gursel Alici, Haiping Du, Yonggang Zhu, Weihua Li
An Integrated Dielectrophoresis-Active Hydrophoretic Microchip For Continuous Particle Filtration And Separation, Sheng Yan, Jun Zhang, Chao Pan, Dan Yuan, Gursel Alici, Haiping Du, Yonggang Zhu, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
Microfluidic manipulation of biological objects from mixture has a significant application in sample preparation and clinical diagnosis. This work presents a dielectrophoresis-active hydrophoretic device for continuous label-free particle separation and filtration. This device comprises interdigitated electrodes and a hydrophoretic channel. According to the difference of lateral positions of polystyrene particles, the device can run at separation or filtration modes by altering the power supply voltages. With an applied voltage of 24 Vp-p, both 3 and 10 μm beads had close lateral positions and were redirected to the same outlet. Under a voltage of 36 Vp-p, beads with the diameters of …
Molecular Dynamics Simulation On Generalized Stacking Fault Energies Of Fcc Metals Under Preloading Stress, Liang Zhang, Cheng Lu, A Kiet Tieu, Xing Zhao, Linqing Pei, Guillaume Michal
Molecular Dynamics Simulation On Generalized Stacking Fault Energies Of Fcc Metals Under Preloading Stress, Liang Zhang, Cheng Lu, A Kiet Tieu, Xing Zhao, Linqing Pei, Guillaume Michal
Faculty of Engineering and Information Sciences - Papers: Part A
Molecular dynamics (MD) simulations are performed to investigate the effects of stress on generalized stacking fault (GSF) energy of three fcc metals (Cu, Al, and Ni). The simulation model is deformed by uniaxial tension or compression in each of [111], [11-2], and [1-10] directions, respectively, before shifting the lattice to calculate the GSF curve. Simulation results show that the values of unstable stacking fault energy (γusf), stable stacking fault energy (γsf), and unstable twin fault energy (γutf) of the three elements can change with the preloaded tensile or compressive stress in different directions. The ratio of γsf/γusf, which is related …
Polymer Fiber Bragg Grating Force Sensors For Minimally Invasive Surgical Devices, Ginu Rajan, Sunish Mathews, Dean Callaghan, Gerald Farrell, Gang-Ding Peng
Polymer Fiber Bragg Grating Force Sensors For Minimally Invasive Surgical Devices, Ginu Rajan, Sunish Mathews, Dean Callaghan, Gerald Farrell, Gang-Ding Peng
Faculty of Engineering and Information Sciences - Papers: Part A
A feasibility study on using polymer fiber Bragg sensors (PFBG) for providing force feedback to minimally invasive surgical devices is carried out. For this purpose a 3 mm long PFBG is fabricated and characterized for strain and temperature sensitivities. The PFBG sensor is then integrated onto a commercial laparoscopic clip applicator which is used as a proof of concept device. The force characterization of the clip applicator is carried out, with a replica setup which simulates the clip forming process of the device. An original clip is then formed without and with synthetic tissue samples of different hardness. The replica …
Shadow Removal Method For Phase-Shifting Profilometry, Lei Lu, Jiangtao Xi, Yanguang Yu, Qinghua Guo, Yongkai Yin, Limei Song
Shadow Removal Method For Phase-Shifting Profilometry, Lei Lu, Jiangtao Xi, Yanguang Yu, Qinghua Guo, Yongkai Yin, Limei Song
Faculty of Engineering and Information Sciences - Papers: Part A
In a typical phase-shifting profilometry system for the three-dimensional (3D) shape measurement, shadows often exist in the captured images as the camera and projector probe the object from different directions. The shadow areas do not reflect the fringe patterns which will cause errors in the measurement results. This paper proposed a new method to remove the shadow areas from taking part in the 3D measurement. With the system calibrated and the object reconstructed, the 3D results are mapped on a point-by-point basis into the corresponding positions on the digital micro-mirror device (DMD) of the projector. A set of roles are …
Energy Efficiency Analysis Of Antenna Selection Multi-Input Multi-Output Automatic Repeat Request Systems Over Nakagami-M Fading Channels, Ngoc Phuc Le, Le Chung Tran, Farzad Safaei, Vineeth Satheeskum Varma
Energy Efficiency Analysis Of Antenna Selection Multi-Input Multi-Output Automatic Repeat Request Systems Over Nakagami-M Fading Channels, Ngoc Phuc Le, Le Chung Tran, Farzad Safaei, Vineeth Satheeskum Varma
Faculty of Engineering and Information Sciences - Papers: Part A
In this study, the authors investigate energy efficiency in antenna selection multi-input multi-output automatic repeat request (MIMO ARQ) wireless systems. The authors first derive an approximate expression for the average frame-error rate (FER) in antenna selection MIMO systems over quasi-static Nakagami-m fading channels. The FER approximation is then used to obtain an analytical expression of an energy-efficiency metric that is defined as the total energy required to successfully deliver one information bit. The authors prove that this energy-efficiency metric is a quasi-convex function with respect to the average signal-to-noise ratio value. Based on this analysis, the authors obtain the optimal …
Maximising Energy Efficiency In Antenna Selection Mimo Wireless Systems Subject To Qos Constraints, Ngoc Phuc Le, Farzad Safaei, Le Chung Tran
Maximising Energy Efficiency In Antenna Selection Mimo Wireless Systems Subject To Qos Constraints, Ngoc Phuc Le, Farzad Safaei, Le Chung Tran
Faculty of Engineering and Information Sciences - Papers: Part A
Energy-efficiency (EE) in antenna selection multi-input–multi-output (MIMO) systems over Nakagami-m fading channels is investigated. An EE metric is defined as the number of successfully received bits per unit of energy consumption, which takes into account several important system parameters such as channel coding and modulation. An optimisation problem that maximises the EE metric subject to an error-performance constraint is formulated. On the basis of an analysis of this problem, the optimal value of the average energy per transmitted data symbol is obtained, such that the EE in the system is maximised. Simulation results are provided to validate the analysis.
Imaging Dose In Breast Radiotherapy: Does Breast Size Affect The Dose To The Organs At Risk And The Risk Of Secondary Cancer To The Contralateral Breast?, Vikneswary Batumalai, Alexandra Quinn, Michael Jameson, Geoff Delaney, Lois C. Holloway
Imaging Dose In Breast Radiotherapy: Does Breast Size Affect The Dose To The Organs At Risk And The Risk Of Secondary Cancer To The Contralateral Breast?, Vikneswary Batumalai, Alexandra Quinn, Michael Jameson, Geoff Delaney, Lois C. Holloway
Faculty of Engineering and Information Sciences - Papers: Part A
Correct target positioning is crucial for accurate dose delivery in breast radiotherapy resulting in utilisation of daily imaging. However, the radiation dose from daily imaging is associated with increased probability of secondary induced cancer. The aim of this study was to quantify doses associated with three imaging modalities and investigate the correlation of dose and varying breast size in breast radiotherapy. Methods: Planning computed tomography (CT) data sets of 30 breast cancer patients were utilised to simulate the dose received by various organs from a megavoltage computed tomography (MV-CT), megavoltage electronic portal image (MV-EPI) and megavoltage cone-beam computed tomography (MV-CBCT). …
Nmr Spectroscopy Of Saccharide-Doped Pagat Dosimeters, P S. Skyt, B Berndt, Lois C. Holloway, Robin Hill, Y De Deene
Nmr Spectroscopy Of Saccharide-Doped Pagat Dosimeters, P S. Skyt, B Berndt, Lois C. Holloway, Robin Hill, Y De Deene
Faculty of Engineering and Information Sciences - Papers: Part A
he aim of this study was to investigate the chemistry of the PAGAT dosimeters when doped with saccharides and irradiated' using NMR spectroscopy. Three batches of PAGAT gel dosimeters were manufactured. Two of them were doped with 20 % glucose and sucrose' respectively. For each batch' one sample was left unirradiated while the remaining samples were irradiated to different doses. After irradiation' NMR spectra were obtained which clearly showed the composition of the dosimeter and the change in monomer concentration caused by irradiation. In addition' it revealed that the saccharides did not directly participate in the chemical process before and …
Benchmarking The Gamma Pass Score Using Arccheck For Routine Dosimetric Qa Of Vmat Plans, Sankar Arumugam, Tony Young, Aitang Xing, David Thwaites, Lois C. Holloway
Benchmarking The Gamma Pass Score Using Arccheck For Routine Dosimetric Qa Of Vmat Plans, Sankar Arumugam, Tony Young, Aitang Xing, David Thwaites, Lois C. Holloway
Faculty of Engineering and Information Sciences - Papers: Part A
A minimum expected gamma (gamma) pass rate for VMAT plan verification using ArcCHECK was established based on the RTTQA, TG119 test cases and 10 clinical plans with varying levels of complexity. The impact of the 'Measurement Uncertainty' parameter as available in the ArcCHECK software on gamma pass rate was studied for both global and local gamma analysis. Our results show that excluding measurement uncertainty adds tighter tolerance in local gamma comparison. From the verification of our benchmark cases we established minimum expected gamma pass rates of 85% and 88% for 2%/2mm global and 3%/3mm local tolerance criteria.
Multi-Period Liner Ship Fleet Planning With Dependent Uncertain Container Shipment Demand, Qiang Meng, Tingsong Wang, Shuaian Wang
Multi-Period Liner Ship Fleet Planning With Dependent Uncertain Container Shipment Demand, Qiang Meng, Tingsong Wang, Shuaian Wang
Faculty of Engineering and Information Sciences - Papers: Part A
This paper deals with a realistic multi-period liner ship fleet planning problem by incorporating stochastic dependency of the random and period-dependent container shipment demand. This problem is formulated as a multi-period stochastic programming model with a sequence of interrelated two-stage stochastic programming (2SSP) problems characterized ship fleet planning in each single period. A solution method integrating dual decomposition and Lagrangian relaxation method is designed for solving the developed model. Numerical experiments are carried out to assess applicability and performance of the proposed model and solution algorithm. The results further demonstrate importance of stochastic dependence of the uncertain container shipment demand.
Permeable Reactive Barrier Rejuvenation By Alkaline Wastewater, Laura Banasiak, Buddhima Indraratna, Glenys Lugg, Udeshini Pathirage, Geoffrey Mcintosh, Neil Rendell
Permeable Reactive Barrier Rejuvenation By Alkaline Wastewater, Laura Banasiak, Buddhima Indraratna, Glenys Lugg, Udeshini Pathirage, Geoffrey Mcintosh, Neil Rendell
Faculty of Engineering and Information Sciences - Papers: Part A
Chemical armouring of recycled concrete in a permeable reactive barrier (PRB) used for the neutralisation of acidic groundwater in acid sulfate soil terrain significantly decreases its acid neutralising capacity (ANC) by approximately 50% compared with its theoretical ANC. A long-term column test was conducted under simulated field groundwater conditions to assess the re-conditioning of armoured recycled concrete aggregates with alkaline wastewater, with the aim to restore and enhance the ANC and longevity of the PRB. The benefits of alkaline wastewater injection included sharp but short enhancement of the recycled concretes' ANC, as indicated by an increase in effluent pH (pH …
Effective Utilization Of Excess Energy In Standalone Hybrid Renewable Energy Systems For Improving Comfort Ability And Reducing Cost Of Energy: A Review And Analysis, M Ismail Ismail, Mahmoud Moghavvemi, T Mahlia, Kashem M. Muttaqi, S Moghavvemi
Effective Utilization Of Excess Energy In Standalone Hybrid Renewable Energy Systems For Improving Comfort Ability And Reducing Cost Of Energy: A Review And Analysis, M Ismail Ismail, Mahmoud Moghavvemi, T Mahlia, Kashem M. Muttaqi, S Moghavvemi
Faculty of Engineering and Information Sciences - Papers: Part A
One of the features that characterize renewable energy sources is their variability and intermittency. Intermittency covers both the predictable and unpredictable variations of their power outputs and uncertainty in the power availability. To overcome the drawback of intermittency, special design considerations should be taken into account. These additional design considerations increases the overall cost of the renewable energy systems. Adding storage system and/or backup source to the renewable sources is one of the measures used to guarantee the continuity of power supply to the loads, and therefore improve the reliability of the renewable energy systems. The operation of renewable energy …
Probing The Internal Structure Of Reverse Osmosis Membranes By Positron Annihilation Spectroscopy: Gaining More Insight Into The Transport Of Water And Small Solutes, Takahiro Fujioka, Nagayasu Oshima, Ryoichi Suzuki, William E. Price, Long D. Nghiem
Probing The Internal Structure Of Reverse Osmosis Membranes By Positron Annihilation Spectroscopy: Gaining More Insight Into The Transport Of Water And Small Solutes, Takahiro Fujioka, Nagayasu Oshima, Ryoichi Suzuki, William E. Price, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
Reverse osmosis (RO) has been employed as a key separation process in many industrial applications. In recent years, the use of positron annihilation spectroscopy (PAS) including positron annihilation lifetime spectroscopy (PALS) and Doppler broadening of annihilation radiation to characterise the internal structure of the skin layer of thin film composite membranes has renewed research interest for further development and optimisation of the RO process. In this paper, we highlight the need for better understanding of the skin layer internal structure. We review relevant PAS techniques that could provide an unprecedented level of insight to our understanding of the internal structure …
Effects Of Salinity Build-Up On Biomass Characteristics And Trace Organic Chemical Removal: Implications On The Development Of High Retention Membrane Bioreactors, Wenhai Luo, Faisal I. Hai, Jinguo Kang, William E. Price, Wenshan Guo, Hao H. Ngo, Kazuo Yamamoto, Long D. Nghiem
Effects Of Salinity Build-Up On Biomass Characteristics And Trace Organic Chemical Removal: Implications On The Development Of High Retention Membrane Bioreactors, Wenhai Luo, Faisal I. Hai, Jinguo Kang, William E. Price, Wenshan Guo, Hao H. Ngo, Kazuo Yamamoto, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study investigated the impact of salinity build-up on the performance of membrane bioreactor (MBR), specifically in terms of the removal and fate of trace organic chemicals (TrOCs), nutrient removal, and biomass characteristics. Stepwise increase of the influent salinity, simulating salinity build-up in high retention MBRs, adversely affected the metabolic activity in the bioreactor, thereby reducing organic and nutrient removal. The removal of hydrophilic TrOCs by MBR decreased due to salinity build-up. By contrast, with the exception of 17α-ethynylestradiol, the removal of all hydrophobic TrOCs was not affected at high salinity. Moreover, salinity build-up had negligible impact on the residual …
Recent Advances In Security And Privacy In Big Data, Yong Yu, Yi Mu, Giuseppe Ateniese
Recent Advances In Security And Privacy In Big Data, Yong Yu, Yi Mu, Giuseppe Ateniese
Faculty of Engineering and Information Sciences - Papers: Part A
Big data has become an important topic in science, engineering, medicine, healthcare, finance, business and ultimately society itself. Big data refers to the massive amount of digital information stored or transmitted in computer systems. Approximately, 2.5 quintillion bytes of data are created every day. Almost 90% of data in the world today are created in the last two years alone. Security and privacy issues becomes more critical due to large volumes and variety, due to data hosted in large-scale cloud infrastructures, diversity of data sources and formats, streaming nature of data acquisition and high volume inter-cloud migration. In large-scale cloud …
Study On Surface Asperity Flattening In Cold Quasi-Static Uniaxial Planar Compression By Crystal Plasticity Finite Element Method, Hejie Li, Zhengyi Jiang, Dongbin Wei, Jianzhong Xu, Xiaoming Zhang, Dianyao Gong, Jingtao Han
Study On Surface Asperity Flattening In Cold Quasi-Static Uniaxial Planar Compression By Crystal Plasticity Finite Element Method, Hejie Li, Zhengyi Jiang, Dongbin Wei, Jianzhong Xu, Xiaoming Zhang, Dianyao Gong, Jingtao Han
Faculty of Engineering and Information Sciences - Papers: Part A
In order to study the surface asperity flattening in a quasi-static cold uniaxial planar compression, the experimental results of atomic force microscope and electron backscattered diffraction have been employed in a ratedependent crystal plasticity model to analyze this process. The simulation results show a good agreement with the experimental results: in this quasi-static deformation process, lubrication can hinder the surface asperity flattening process even under very low deformation rate. However, due to the limitation of the model and some parameters, the simulation results cannot predict all the properties in detail such as S orientation {123}and the maximum stress in sample …