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Articles 871 - 900 of 2936
Full-Text Articles in Social and Behavioral Sciences
Nutrient And Trace Organic Contaminant Removal From Wastewater Of A Resort Town: Comparison Between A Pilot And A Full Scale Membrane Bioreactor, Hop V. Phan, Faisal I. Hai, James A. Mcdonald, Stuart J. Khan, Ren Zhang, William E. Price, Andreas Broeckmann, Long D. Nghiem
Nutrient And Trace Organic Contaminant Removal From Wastewater Of A Resort Town: Comparison Between A Pilot And A Full Scale Membrane Bioreactor, Hop V. Phan, Faisal I. Hai, James A. Mcdonald, Stuart J. Khan, Ren Zhang, William E. Price, Andreas Broeckmann, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
The occurrence of a broad spectrum of trace organic contaminants (TrOCs) in raw sewage from a small resort town and their removal by a full- and a pilot-scale membrane bioreactor (MBR) was analysed in this study. The MBR systems demonstrated similar reduction of chemical oxygen demand. However, the full-scale MBR sustained higher and more stable nutrient removal (>95% for both total nitrogen, TN and phosphate, View the MathML sourcePO43−-P) than the pilot-scale system (ca. 80% TN and 30% View the MathML sourcePO43−-P removal). Of the 45 monitored TrOCs including pharmaceuticals and personal care products (PPCPs), industrial chemicals, steroid hormones, …
Shear Behaviour Of Sandy Silt Treated With Lignosulfonate, Qingsheng Chen, Buddhima Indraratna
Shear Behaviour Of Sandy Silt Treated With Lignosulfonate, Qingsheng Chen, Buddhima Indraratna
Faculty of Engineering and Information Sciences - Papers: Part A
Chemical stabilizers (e.g., cement, lime, gypsum, and other alkaline admixtures) have been widely used to enhance the strength and compressibility properties of subgrade soils. However, traditional chemical stabilizers are not always acceptable in Australia because they often pose a threat to the surrounding environment. Moreover, traditionally treated soils usually exhibit excessive brittle behaviour, which is often undesirable for transport infrastructure such as rail embankments and airport runways. To establish an alternative stabilizer that could overcome the above problems, this note presents a series of experimental results on the use of lignosulfonate (by-product of timber and paper industry), an environmentally friendly …
Working In Partnership To Develop Engineering Capacity In Energy Efficiency, Cheryl Desha, Duane A. Robinson, Alistair Sproul
Working In Partnership To Develop Engineering Capacity In Energy Efficiency, Cheryl Desha, Duane A. Robinson, Alistair Sproul
Faculty of Engineering and Information Sciences - Papers: Part A
Energy efficiency is a complex topic to integrate into higher education curricula, with limited success internationally or in Australia. This paper discusses one of the successful initiatives within the Energy Efficiency Training Program, which was jointly managed and implemented by the New South Wales Office of Environment and Heritage and Department of Education and Communities. The state government initiative aimed to increase the knowledge and skills of the New South Wales workforce, help business to identify and implement energy efficiency projects, and provide professional development for the training providers. Key sectors targeted included property, construction, manufacturing and services. The Program …
A Refined General Summation Law For Vu Emission Assessment In Radial Networks, Jayatunga Vitharanage Upuli Priyadarshani Jayatunga, Sarath Perera, Philip Ciufo, Ashish P. Agalgaonkar
A Refined General Summation Law For Vu Emission Assessment In Radial Networks, Jayatunga Vitharanage Upuli Priyadarshani Jayatunga, Sarath Perera, Philip Ciufo, Ashish P. Agalgaonkar
Faculty of Engineering and Information Sciences - Papers: Part A
Voltage unbalance (VU) management of power systems requires the development of well researched engineering practices to maintain acceptable VU levels while utilising the total VU absorption capacity of the power system. In this regard, IEC/TR 61000-3-13:2008 prescribes a VU emission allocation methodology based on a stochastic approach which uses a general summation law in order to aggregate numerous sources of unbalance to take into account their random variations. On the other hand, recent deterministic studies on VU emission assessment at the post-connection stage of unbalanced installations present a complex VU factor based approach to determine constituent components of the post-connection …
Multi-View Twri Scene Reconstruction Using A Joint Bayesian Sparse Approximation Model, Van Ha Tang, Abdesselam Bouzerdoum, Son Lam Phung, Fok Hing Chi Tivive
Multi-View Twri Scene Reconstruction Using A Joint Bayesian Sparse Approximation Model, Van Ha Tang, Abdesselam Bouzerdoum, Son Lam Phung, Fok Hing Chi Tivive
Faculty of Engineering and Information Sciences - Papers: Part A
This paper addresses the problem of scene reconstruction in conjunction with wall-clutter mitigation for compressed multi-view through-the-wall radar imaging (TWRI). We consider the problem where the scene behindthe-wall is illuminated from different vantage points using a different set of frequencies at each antenna. First, a joint Bayesian sparse recovery model is employed to estimate the antenna signal coefficients simultaneously, by exploiting the sparsity and inter-signal correlations among antenna signals. Then, a subspace-projection technique is applied to suppress the signal coefficients related to the wall returns. Furthermore, a multi-task linear model is developed to relate the target coefficients to the image …
On Using Wireless Power Transfer To Increase The Max Flow Of Rechargeable Wireless Sensor Networks, Tengjiao He, Kwan-Wu Chin, Sieteng Soh
On Using Wireless Power Transfer To Increase The Max Flow Of Rechargeable Wireless Sensor Networks, Tengjiao He, Kwan-Wu Chin, Sieteng Soh
Faculty of Engineering and Information Sciences - Papers: Part A
A key problem in Rechargeable Wireless Sensor Networks (WSNs) is determining the maximum amount of data that can be collected by a sink over a given time period. This maximum is constrained by link capacity and critically, by the available energy at each node. In this paper, we consider a novel approach to increase the maximum flow rate by exploiting recent advances in Wireless Power Transfer (WPT). Specifically, we deploy a finite number of WPT capable rovers next to bottleneck sensor nodes with the aim to increase the max flow rate of a WSN. We formulate a Mixed Integer Linear …
Phase Unwrapping Method Based On Multiple Fringe Patterns Without Use Of Equivalent Wavelengths, Limei Song, Yulan Chang, Jiangtao Xi, Qinghua Guo, Xin-Jun Zhu, Xiaojie Li
Phase Unwrapping Method Based On Multiple Fringe Patterns Without Use Of Equivalent Wavelengths, Limei Song, Yulan Chang, Jiangtao Xi, Qinghua Guo, Xin-Jun Zhu, Xiaojie Li
Faculty of Engineering and Information Sciences - Papers: Part A
In order to decrease the noise enhancement in the process of phase unwrapping, we present a new phase unwrapping approach for multiple wavelength phase shift profilometry. In this approach, a series of fringe images with only three wavelengths are captured by the 3D measurement system, and it does not need to calculate the equivalent wavelengths and the equivalent phases. As a result, the noise enhancement is avoided, leading to improved precision in the absolute phase map recovery. Experiment results demonstrate that the proposed method is more robust and effective compared to the existing TWPSP method.
On The Performance Of Online And Offline Green Path Establishment Techniques, Alejandro Ruiz-Rivera, Kwan-Wu Chin, Sieteng Soh, Raad Raad
On The Performance Of Online And Offline Green Path Establishment Techniques, Alejandro Ruiz-Rivera, Kwan-Wu Chin, Sieteng Soh, Raad Raad
Faculty of Engineering and Information Sciences - Papers: Part A
To date, significant effort has gone into designing green traffic engineering (TE) techniques that consolidate traffic onto the minimal number of links/switches/routers during off-peak periods. However, little works exist that aim to green Multi-Protocol Label Switching (MPLS) capable networks. Critically, no work has studied the performance of green label switched paths (LSPs) establishment methods in terms of energy savings and acceptance rates. Henceforth, we add to the current state-of-the-art by studying green online and offline (LSP) establishment methods. Online methods rely only on past and current LSP requests while offline ones act as a theoretical benchmark whereby they also have …
Uncertainty Management In Multiobjective Hydro-Thermal Self-Scheduling Under Emission Considerations, Jamshid Aghaei, Abdollah Ahmadi, Abdorreza Rabiee, Vassilios G. Agelidis, Kashem M. Muttaqi, H A. Shayanfar
Uncertainty Management In Multiobjective Hydro-Thermal Self-Scheduling Under Emission Considerations, Jamshid Aghaei, Abdollah Ahmadi, Abdorreza Rabiee, Vassilios G. Agelidis, Kashem M. Muttaqi, H A. Shayanfar
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, a stochastic multiobjective framework is proposed for a day-ahead short-term Hydro Thermal Self-Scheduling (HTSS) problem for joint energy and reserve markets. An efficient linear formulations are introduced in this paper to deal with the nonlinearity of original problem due to the dynamic ramp rate limits, prohibited operating zones, operating services of thermal plants, multi-head power discharge characteristics of hydro generating units and spillage of reservoirs. Besides, system uncertainties including the generating units' contingencies and price uncertainty are explicitly considered in the stochastic market clearing scheme. For the stochastic modeling of probable multiobjective optimization scenarios, a lattice Monte …
An Efficient Background Modeling Approach Based On Vehicle Detection, Jia-Yan Wang, Limei Song, Jiangtao Xi, Qinghua Guo
An Efficient Background Modeling Approach Based On Vehicle Detection, Jia-Yan Wang, Limei Song, Jiangtao Xi, Qinghua Guo
Faculty of Engineering and Information Sciences - Papers: Part A
The existing Gaussian Mixture Model(GMM) which is widely used in vehicle detection suffers inefficiency in detecting foreground image during the model phase, because it needs quite a long time to blend the shadows in the background. In order to overcome this problem, an improved method is proposed in this paper. First of all, each frame is divided into several areas(A, B, C and D), Where area A, B, C and D are decided by the frequency and the scale of the vehicle access. For each area, different new learning rate including weight, mean and variance is applied to accelerate the …
Shear Behaviour Of Methane Hydrate Bearing Sand: Dem Simulations, J S. Vinod, M Hyodo, B Indraratna, S Kajiyama
Shear Behaviour Of Methane Hydrate Bearing Sand: Dem Simulations, J S. Vinod, M Hyodo, B Indraratna, S Kajiyama
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents the numerical simulations results carried out using Discrete Element Method (DEM) on the shear behaviour of Methane Hydrate (MH) bearing sand during monotonic loading. A series of triaxial drained loading tests were carried on an assembly of particles for different methane hydrate saturations. In this study, pore filling habit of MH leading to load bearing distribution is considered for the DEM simulation. In qualitative sense, the DEM simulations results have captured the shear behaviour of MH bearing sand similar to the laboratory experiments. The DEM simulation results highlights that MH saturation and confining pressure has a profound …
Stability Enhancement Of Magnetic Levitation Ball System With Two Controlled Electomagnets, Hai Huang, Haiping Du, Weihua Li
Stability Enhancement Of Magnetic Levitation Ball System With Two Controlled Electomagnets, Hai Huang, Haiping Du, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
Magnetic levitation ball system is a highly nonlinear and unstable system. If the system is linearised at the equilibrium point, the achievable balance range of the magnetically levitated ball is very short with one electromagnet. This paper presents an improved magnetic levitation ball system, that contains two electromagnets, where one electromagnet is set above the magnetic ball for pulling, and another one is set under the magnetic ball for pushing. In addition, this paper applies a 2-DOF (degree-of-freedom) PID (proportional-integral-derivative) controller instead of 1-DOF PID for the control of the two electromagnets so that they can work corporately to make …
Optical Bistability Induced By Nonlinear Surface Plasmon Polaritons In Graphene In Terahertz Regime, Matthew Sanderson, Yee Sin Ang, Sen Gong, Tao Zhao, Min Hu, Renbin Zhong, Xiaoxing Chen, Ping Zhang, Chao Zhang, Shenggang Liu
Optical Bistability Induced By Nonlinear Surface Plasmon Polaritons In Graphene In Terahertz Regime, Matthew Sanderson, Yee Sin Ang, Sen Gong, Tao Zhao, Min Hu, Renbin Zhong, Xiaoxing Chen, Ping Zhang, Chao Zhang, Shenggang Liu
Faculty of Engineering and Information Sciences - Papers: Part A
We demonstrate optical bistability in a prism-air-graphene-dielectric structure. Under a moderate electric field in the terahertz frequency regime, the third order nonlinear optical conductivity is comparable to the linear conductivity. The nonlinear conductivity enhances the energy of surface plasmon polaritons. Both the energy and frequency of the surface plasmon polaritons depend on the strength of the nonlinear current in the graphene layer. When considering excitation in the Kretschmann configuration, the reflectance as a function of frequency exhibits bistability. The origin of the bistability is the field dependence of the plasmon mode. We have determined the parameter regime for the occurrence …
Towards Bringing Adaptive Micro Learning Into Mooc Courses, Geng Sun, Tingru Cui, Kuanching Li, Dongming Xu, Shiping Chen, Jun Shen, Wanwu Guo
Towards Bringing Adaptive Micro Learning Into Mooc Courses, Geng Sun, Tingru Cui, Kuanching Li, Dongming Xu, Shiping Chen, Jun Shen, Wanwu Guo
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper we illustrate a proposal with regard to providing learners adaptive micro learning experiences, which can be fulfilled within fragmented time pieces. The framework of our system is demonstrated, while it aims to deliver customized micro learning contents taking into account learners’ specific demands, learning styles, preference and context.
Review Of Phase Change Emulsions (Pcmes) And Their Applications In Hvac Systems, Jingjing Shao, Jo Darkwa, Georgios Kokogiannakis
Review Of Phase Change Emulsions (Pcmes) And Their Applications In Hvac Systems, Jingjing Shao, Jo Darkwa, Georgios Kokogiannakis
Faculty of Engineering and Information Sciences - Papers: Part A
Phase change material emulsions (PCMEs) are multifunctional fluids consisting of phase change materials (PCMs) and carrier fluids. PCMEs could be potential candidates as heat transfer media in heating, ventilation and air conditioning (HVAC) systems. This is mainly because PCME could take advantage of its high heat capacity to reduce flow rate and thus saving pumping power whilst delivering the same amount of cooling effect. PCME can also simultaneously act as cold storage to shift peak-load to off-peak time and improve the COP of systems. However, the optimum design of integrated system requires a good understanding of flow behaviour and heat …
Optimized Frp Wrapping Schemes For Circular Concrete Columns Under Axial Compression, Thong M. Pham, Muhammad N. S Hadi, Jim Youssef
Optimized Frp Wrapping Schemes For Circular Concrete Columns Under Axial Compression, Thong M. Pham, Muhammad N. S Hadi, Jim Youssef
Faculty of Engineering and Information Sciences - Papers: Part A
This study investigates the behavior and failure modes of FRP confined concrete wrapped with different FRP schemes, including fully wrapped, partially wrapped and non-uniformly wrapped concrete cylinders. By using the same amount of FRP, this study proposes a new wrapping scheme that provides a higher compressive strength and strain for FRP-confined concrete, in comparison with conventional fully wrapping schemes. A total of thirty three specimens were cast and tested, with three of these specimens acting as reference specimens and the remaining specimens wrapped with different types of FRP (CFRP and GFRP) by different wrapping schemes. For specimens that belong to …
Rejection Of Trace Organic Chemicals By A Nanofiltration Membrane: The Role Of Molecular Properties And Effects Of Caustic Cleaning, Takahiro Fujioka, Stuart J. Khan, James A. Mcdonald, Long D. Nghiem
Rejection Of Trace Organic Chemicals By A Nanofiltration Membrane: The Role Of Molecular Properties And Effects Of Caustic Cleaning, Takahiro Fujioka, Stuart J. Khan, James A. Mcdonald, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study aims to provide further insights to the rejection mechanisms of trace organic chemicals (TrOCs) by nanofiltration (NF). The separation mechanisms of TrOCs by an NF membrane were elucidated by assessing the role of molecular properties and the impact of caustic cleaning on their rejection. All charged TrOCs were rejected by the NF270 membrane by more than 80%. However, the rejection of positively charged TrOCs was lower than that of negatively charged TrOCs with similar molecular sizes and was similar to the rejection of neutral TrOCs. The results suggest that size exclusion, rather than electrostatic repulsion, was a major …
Towards Soft Robotic Devices For Site-Specific Drug Delivery, Gursel Alici
Towards Soft Robotic Devices For Site-Specific Drug Delivery, Gursel Alici
Faculty of Engineering and Information Sciences - Papers: Part A
Considerable research efforts have recently been dedicated to the establishment of various drug delivery systems (DDS) that are mechanical/physical, chemical and biological/molecular DDS. In this paper, we report on the recent advances in site-specific drug delivery (site-specific, controlled, targeted or smart drug delivery are terms used interchangeably in the literature, to mean to transport a drug or a therapeutic agent to a desired location within the body and release it as desired with negligibly small toxicity and side effect compared to classical drug administration means such as peroral, parenteral, transmucosal, topical and inhalation) based on mechanical/physical systems consisting of implantable …
Facile Synthesis Of Coaxial Cnts/Mnox-Carbon Hybrid Nanofibers And Their Greatly Enhanced Lithium Storage Performance, Zunxian Yang, Jun Lv, Haidong Pang, Wenhuan Yan, Kun Qian, Tailiang Guo, Zaiping Guo
Facile Synthesis Of Coaxial Cnts/Mnox-Carbon Hybrid Nanofibers And Their Greatly Enhanced Lithium Storage Performance, Zunxian Yang, Jun Lv, Haidong Pang, Wenhuan Yan, Kun Qian, Tailiang Guo, Zaiping Guo
Faculty of Engineering and Information Sciences - Papers: Part A
Carbon nanotubes (CNTs)/MnOx-Carbon hybrid nanofibers have been successfully synthesized by the combination of a liquid chemical redox reaction (LCRR) and a subsequent carbonization heat treatment. The nanostructures exhibit a unique one-dimensional core/shell architecture, with one-dimensional CNTs encapsulated inside and a MnOx-carbon composite nanoparticle layer on the outside. The particular porous characteristics with many meso/micro holes/pores, the highly conductive one-dimensional CNT core, as well as the encapsulating carbon matrix on the outside of the MnOx nanoparticles, lead to excellent electrochemical performance of the electrode. The CNTs/MnOx-Carbon hybrid nanofibers exhibit a high initial reversible capacity of …
Improving Low Voltage Ride-Through Using Super Capacitor At The Dc Link Of Doubly-Fed Induction Generator Based Wind Turbine, Ahmed M. Haidar, Mehrdad Tarafdar Hagh, Kashem M. Muttaqi
Improving Low Voltage Ride-Through Using Super Capacitor At The Dc Link Of Doubly-Fed Induction Generator Based Wind Turbine, Ahmed M. Haidar, Mehrdad Tarafdar Hagh, Kashem M. Muttaqi
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a simple methodology to improve the low voltage ride-through (LVRT) capability of Doubly Fed Induction Generator (DFIG) based wind turbines in order to ride through higher voltage sags and durations. The proposed method is based on selection of an appropriate value for DC side super capacitor (SC) in such a way that it could help wind turbine for LVRT without any need to crowbar protection. The operation of SC based wind turbine in normal and fault conditions is simulated using MATLAB/SIMULINK. The simulation results show that the proposed method can be used effectively for LVRT improvement and …
Fractional Order Modelling Of The Cumulative Deformation Of Granular Soils Under Cyclic Loading, Yifei Sun, Yang Xiao, Khairul Fikry Hanif
Fractional Order Modelling Of The Cumulative Deformation Of Granular Soils Under Cyclic Loading, Yifei Sun, Yang Xiao, Khairul Fikry Hanif
Faculty of Engineering and Information Sciences - Papers: Part A
To model the cumulative deformation of granular soils under cyclic loading, a mathematical model was proposed. The power law connection between the shear strain and loading cycle was represented by using fractional derivative approach. The volumetric strain was characterized by a modified cyclic flow rule which considered the effect of particle breakage. All model parameters were obtained by the cyclic and static triaxial tests. Predictions of the test results were provided to validate the proposed model. Comparison with an existing cumulative model was also made to show the advantage of the proposed model.
Effects Of Fouling And Degradation On Geotechnical Behaviour Of Railway Ballast, S S. Nimbalkar, N Tennakoon, B Indraratna
Effects Of Fouling And Degradation On Geotechnical Behaviour Of Railway Ballast, S S. Nimbalkar, N Tennakoon, B Indraratna
Faculty of Engineering and Information Sciences - Papers: Part A
Conventionally, rail tracks are positioned on ballast due to economy, rapid drainage and high shear strength. However, the ballast becomes fouledand degraded as track ages. In order to identify the risk associated with fouling, it is important to accurately assess the amount of fouling using volume based parameter, Void Contaminant Index (VCI). A series of isotropically consolidated drained triaxial tests using a large scale triaxial apparatus were conducted on both clean and fouled ballast with varying VCI to establish the relationship between the amountof fouling and the strength-deformation characteristics. Based on the laboratory findings, an empirical relationship between the peak …
Generating Searchable Public-Key Ciphertexts With Hidden Structures For Fast Keyword Search, Peng Xu, Qianhong Wu, Wei Wang, Willy Susilo, Josep Domingo-Ferrer, Hai Jin
Generating Searchable Public-Key Ciphertexts With Hidden Structures For Fast Keyword Search, Peng Xu, Qianhong Wu, Wei Wang, Willy Susilo, Josep Domingo-Ferrer, Hai Jin
Faculty of Engineering and Information Sciences - Papers: Part A
Existing semantically secure public-key searchable encryption schemes take search time linear with the total number of the ciphertexts. This makes retrieval from large-scale databases prohibitive. To alleviate this problem, this paper proposes searchable public-key ciphertexts with hidden structures (SPCHS) for keyword search as fast as possible without sacrificing semantic security of the encrypted keywords. In SPCHS, all keyword-searchable ciphertexts are structured by hidden relations, and with the search trapdoor corresponding to a keyword, the minimum information of the relations is disclosed to a search algorithm as the guidance to find all matching ciphertexts efficiently. We construct an SPCHS scheme from …
The Relationship Between Using Electronic Health Records And Meeting Accreditation Standards For Client Safety In Residential Aged Care Homes, Tao Jiang, Ping Yu
The Relationship Between Using Electronic Health Records And Meeting Accreditation Standards For Client Safety In Residential Aged Care Homes, Tao Jiang, Ping Yu
Faculty of Engineering and Information Sciences - Papers: Part A
This study aims to identify the benefits of using electronic health records (EHR) for client safety in residential aged care (RAC) homes. The aged care accreditation reports published between 27 April 2011 and 3 December 2013 were downloaded and analysed. It could be seen from these reports that only 1,031(37.45%) RAC homes in Australia had adopted an EHR system by 2013. 13 RAC homes failed one or more accreditation standards. Only one of these was using an EHR system and this one met the accreditation standards on information systems. Our study provides empirical evidence to suggest that adopting and using …
Who Kicks Whom? Contextual And Temporal Effects In The It Use - Performance Relationship, Abhijith Anand, Rajeev Sharma, Rajiv Kohli
Who Kicks Whom? Contextual And Temporal Effects In The It Use - Performance Relationship, Abhijith Anand, Rajeev Sharma, Rajiv Kohli
Faculty of Engineering and Information Sciences - Papers: Part A
This research extends extant literature examining the relationship between IS use and performance. While prior theory has predominantly treated IS use as an antecedent of performance and hypothesized a positive effect of use on performance, this research provides an alternative perspective. Specifically, this paper theorizes that under certain contexts performance can be an antecedent of use and that the effect can be in the opposite direction. In contrast to non-contingent models, this paper proposes a contingent model in which the IS use-performance relationship is contingent on organizational performance and varies over time. The model proposed here is tested on longitudinal …
Analysis Of An Activated Sludge Model In Which Dead Biomass Is Recycled Into Slowly Biodegradable Particulate Substrate, Asma O. Alharbi, Mark Ian Nelson, Annette L. Worthy, Harvinder S. Sidhu
Analysis Of An Activated Sludge Model In Which Dead Biomass Is Recycled Into Slowly Biodegradable Particulate Substrate, Asma O. Alharbi, Mark Ian Nelson, Annette L. Worthy, Harvinder S. Sidhu
Faculty of Engineering and Information Sciences - Papers: Part A
A significant drawback of the activated sludge process is the production of excess 'sludge'; the disposal of which can account for 50-60% of the running costs of a wastewater treatment plant. We investigate a model for the activated sludge process in which the influent contains a mixture of soluble and slowly biodegradable particulate substrate. Within the bioreactor, the particulate substrate is hydrolyzed to form soluble substrate. In turn, these are used for growth by the biomass. Biomass decay produces slowly biodegradable substrate and non-biodegradable particulates. Steady-state analysis is used to investigate how the amount of sludge formed depends upon the …
The Diffusive Lotka-Volterra Predator-Prey System With Delay, K S. Al Noufaey, T R. Marchant, M P. Edwards
The Diffusive Lotka-Volterra Predator-Prey System With Delay, K S. Al Noufaey, T R. Marchant, M P. Edwards
Faculty of Engineering and Information Sciences - Papers: Part A
Semi-analytical solutions for the diffusive Lotka-Volterra predator-prey system with delay are considered in one and two-dimensional domains. The Galerkin method is applied, which approximates the spatial structure of both the predator and prey populations. This approach is used to obtain a lower-order, ordinary differential delay equation model for the system of governing delay partial differential equations. Steady-state and transient solutions and the region of parameter space, in which Hopf bifurcations occur, are all found. In some cases simple linear expressions are found as approximations, to describe steady-state solutions and the Hopf parameter regions. An asymptotic analysis for the periodic solution …
Full-Scale Approximations Of Spatio-Temporal Covariance Models For Large Datasets, Bohai Zhang, Huiyan Sang, Jianhua Z. Huang
Full-Scale Approximations Of Spatio-Temporal Covariance Models For Large Datasets, Bohai Zhang, Huiyan Sang, Jianhua Z. Huang
Faculty of Engineering and Information Sciences - Papers: Part A
Various continuously-indexed spatio-temporal process models have been constructed to characterize spatio-temporal dependence structures, but the computational complexity for model fitting and predictions grows in a cubic order with the size of dataset and application of such models is not feasible for large datasets. This article extends the full-scale approximation (FSA) approach by Sang and Huang (2012) to the spatio-temporal context to reduce computational complexity. A reversible jump Markov chain Monte Carlo (RJMCMC) algorithm is proposed to select knots automatically from a discrete set of spatio-temporal points. Our approach is applicable to nonseparable and nonstationary spatio-temporal covariance models. We illustrate the …
Axial Compressive Behaviour Of Circular Concrete Filled Fibre Reinforced Polymer Tube (Cfft) Columns, Qasim S. Khan, M Neaz Sheikh, Muhammad N. S Hadi
Axial Compressive Behaviour Of Circular Concrete Filled Fibre Reinforced Polymer Tube (Cfft) Columns, Qasim S. Khan, M Neaz Sheikh, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part A
Concrete Filled Fibre Reinforced Polymer Tube (CFFT) technique for new reinforced concrete (RC) column construction has attracted significant research attention in recent years. The CFFT acts as a longitudinal and transverse reinforcement and serves as a formwork. The CFFT also acts as a barrier to corrosion accelerating agents and reduces the corrosion phenomenon in RC column specimens. A total of six circular CFFT specimens of 152.5 mm in diameter and 305 mm in height were cast to investigate the axial compressive behaviour of two types of circular CFFT specimens with similar nominal confinement ratios. Type-1 CFFT specimens consisted of 0.5 …
Strength And Ductility Behavior Of Circular Concrete Columns Reinforced With Gfrp Bars And Helices, Hogr Karim, Bransen Noel-Gough, M Neaz Sheikh, Muhammad N. S Hadi
Strength And Ductility Behavior Of Circular Concrete Columns Reinforced With Gfrp Bars And Helices, Hogr Karim, Bransen Noel-Gough, M Neaz Sheikh, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part A
Long-term durability is a concern for Reinforced Concrete (RC) structures. Instances of premature deterioration of concrete structures due to corrosion of steel reinforcement are increasing. The use of Glass Fiber Reinforced Polymer (GFRP) bars as an alternative to traditional steel reinforcement in RC structures may resist premature deterioration. Although RC building and bridge columns in coastal areas are susceptible to significant deterioration, studies on concrete columns reinforced with GFRP bars and helices are limited. Also, design codes do not recommend the use of GFRP bars in compression members. This study investigates the use of GFRP bars and helices as longitudinal …