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Full-Text Articles in Social and Behavioral Sciences
Design Of Geopolymer Concrete With Ggbfs At Ambient Curing Condition Using Taguchi Method, Muhammad N. S Hadi, Nabeel Farhan, M Neaz Sheikh
Design Of Geopolymer Concrete With Ggbfs At Ambient Curing Condition Using Taguchi Method, Muhammad N. S Hadi, Nabeel Farhan, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, the Taguchi method has been used to design optimum mix proportions for geopolymer concrete with ground granulated blast furnace slag (GGBFS) as aluminosilicate source at ambient curing condition. The influences of binder content, alkaline activator to binder content (Al/Bi) ratio, sodium silicate to sodium hydroxide (SS/SH) ratio, and sodium hydroxide (SH) concentration on the geopolymer concrete were investigated. A total of nine mix designs were evaluated. It was found that specimens with a binder content of 450 kg/m3, Al/Bi ratio of 0.35, SS/SH ratio of 2.5, and SH concentration of 14 M produced the highest …
Orthogonal Experimental Design Of Titanium Dioxide - Poly(Methyl Methacrylate) Electrospun Nanocomposite Membranes For Photocatalytic Applications, Andrew Vild, Sara Teixeira, Klaus Kuhn, Gianaurelio Cuniberti, Vitor Sencadas
Orthogonal Experimental Design Of Titanium Dioxide - Poly(Methyl Methacrylate) Electrospun Nanocomposite Membranes For Photocatalytic Applications, Andrew Vild, Sara Teixeira, Klaus Kuhn, Gianaurelio Cuniberti, Vitor Sencadas
Faculty of Engineering and Information Sciences - Papers: Part A
An orthogonal experimental method was designed to assess the influence of the electrospinning processing parameters on average diameter and distribution of poly(methyl methacrylate) (PMMA) fibers. Based on the orthogonal experimental design analysis, electrospun TiO2-PMMA nanocomposites were processed with the optimal polymer processing conditions to obtain thin fibers with a high overall surface area. Further it was found that the average fiber diameter decreases from 2.0 ± 0.5 down to 1.2 ± 0.2 μm with increasing photocatalyst content. Moreover, the wettability of samples was independent of the filler amount, and showed strong hydrophobic behavior. Thermogravimetric analysis showed that for polymer solutions …
Optimal Design Of Fixture Layout In A Multi-Station Assembly Using Highly Optimized Tolerance Inspired Heuristic, Satish Tyagi, Nagesh Shukla, Sumant Kulkarni
Optimal Design Of Fixture Layout In A Multi-Station Assembly Using Highly Optimized Tolerance Inspired Heuristic, Satish Tyagi, Nagesh Shukla, Sumant Kulkarni
Faculty of Engineering and Information Sciences - Papers: Part A
The multi-station assembly (MSA) process requires auxiliary devices such as fixtures and clamps to accurately locate and firmly hold the workpiece in a desired position. Improper positioning of these fixtures and clamps affects the dimensional integrity of final product. This study determines the optimal design of fixture layout that minimizes the product dimensional variations caused by the manhandling and aging of auxiliaries. In order to model variation propagation from one assembly station to another in the MSA, a state space model is employed. Further, an E-optimality based sensitivity criterion is proposed to mathematically formulate and measure the quality of the …
Design-Oriented Stress–Strain Model For Concrete Under Combined Frp-Steel Confinement, G Lin, Tao Yu, Jin Guang Teng
Design-Oriented Stress–Strain Model For Concrete Under Combined Frp-Steel Confinement, G Lin, Tao Yu, Jin Guang Teng
Faculty of Engineering and Information Sciences - Papers: Part A
Extensive research has been conducted on fiber-reinforced polymer (FRP)-confined plain and RC columns, leading to a large number of stress–strain models. Most of these models have been developed for FRP-confined plain concrete and are thus applicable only to concrete in FRP-confined RC columns with a negligible amount of transverse steel reinforcement. The few models that have been developed for concrete under the combined confinement of FRP and transverse steel reinforcement are either inaccurate or too complex for direct use in design. This paper presents an accurate design-oriented stress–strain model for concrete under combined FRP-steel confinement in FRP-confined circular RC columns. …
Exploring Virtual World Innovations And Design Through Learner Voices, Sue Gregory, Brent Gregory, Marcus Mcdonald, Sasha Nikolic, Helen Farley, Judy O'Connell, Des Butler, Lisa Jacka, Scott Grant, Jay Jay Jegathesan
Exploring Virtual World Innovations And Design Through Learner Voices, Sue Gregory, Brent Gregory, Marcus Mcdonald, Sasha Nikolic, Helen Farley, Judy O'Connell, Des Butler, Lisa Jacka, Scott Grant, Jay Jay Jegathesan
Faculty of Engineering and Information Sciences - Papers: Part A
Student voice has played a big role in shaping the development and measure of success/failure of virtual worlds in education. Data on past and ongoing educational uses and contexts of use of virtual worlds and associated student feedback was gathered via a survey of educational researchers specialising in virtual worlds. Introduced are a range of specific uses that provide the source of and context for student feedback. Ten major themes emerged from student voices that highlight strengths and weakness and point the way forward for both educators and the students themselves. Positive feedback highlighted experiences of both pedagogical design and …
Thermal Performance Evaluation And Optimal Design Of Buildings With Integrated Air-Based Photovoltaic Thermal Collectors And Phase Change Materials Using The Hooke-Jeeves Pattern Search Method, Wenye Lin, Zhenjun Ma, Paul Cooper
Thermal Performance Evaluation And Optimal Design Of Buildings With Integrated Air-Based Photovoltaic Thermal Collectors And Phase Change Materials Using The Hooke-Jeeves Pattern Search Method, Wenye Lin, Zhenjun Ma, Paul Cooper
Faculty of Engineering and Information Sciences - Papers: Part A
Over the last several decades, many low energy technologies have been developed and deployed to reduce building energy consumption. Among various solutions, solar photovoltaic thermal (PVT) collectors and phase change materials (PCMs) are among the most promising methods receiving increasing attention. This paper presents a thermal performance evaluation and optimal design of buildings integrated with air-based solar PVT collectors and PCMs embedded in the building envelope by using The Hooke-Jeeves pattern search method. The Hooke-Jeeves generalized pattern search is used to search for optimal solutions of the optimization problem. The variables optimized include the PVT air flow rate, additional wall …
Design And Development Of A Parametrically Excited Nonlinear Energy Harvester, Tanju Yildirim, Mergen H. Ghayesh, Weihua Li, Gursel Alici
Design And Development Of A Parametrically Excited Nonlinear Energy Harvester, Tanju Yildirim, Mergen H. Ghayesh, Weihua Li, Gursel Alici
Faculty of Engineering and Information Sciences - Papers: Part A
An energy harvester has been designed, fabricated and tested based on the nonlinear dynamical response of a parametrically excited clamped-clamped beam with a central point-mass; magnets have been used as the central point-mass which pass through a coil when parametrically excited. Experiments have been conducted for the energy harvester when the system is excited (i) harmonically near the primary resonance; (ii) harmonically near the principal parametric resonance; (iii) by means of a non-smooth periodic excitation. An electrodynamic shaker was used to parametrically excite the system and the corresponding displacement of the magnet and output voltages of the coil were measured. …
Evaluation Of A Partial Ring Design For The Insert Spect/Mri System, Kell Erlandsson, Debora Slavado, Alexandre B. Bousse, Brian F. Hutton
Evaluation Of A Partial Ring Design For The Insert Spect/Mri System, Kell Erlandsson, Debora Slavado, Alexandre B. Bousse, Brian F. Hutton
Faculty of Engineering and Information Sciences - Papers: Part A
The aim of the INSERT project is to develop a SPECT insert for a commercial MRI system, for performing simultaneous SPECT/MRI brain studies in humans. We have previously investigated various design options for the detector system, based on a complete ring of detectors. We are now considering a partial ring, due to space limitations. We have investigated the degradation in image quality with a partial ring as compared to a full ring, and the possibility of addressing the limitations by utilising MRI data during reconstruction. Noise-free data were generated by forward-projecting a cylindrical phantom with spherical inserts for a full-ring …
The Design Requirements For Libyan Imaging Mini-Satellite (Libyasat-1), Faisel Em M Tubbal, Asem Elarabi, Abdelmonem Etabeb, Hasan Marah, Khaled Beneljankou, Mosbah Bellid, Riyadh El-Bouaishi, Ahmed Amer, Wesam Shita, Saleh Srabet, Akram Alkaseh, Ahmed Turkman
The Design Requirements For Libyan Imaging Mini-Satellite (Libyasat-1), Faisel Em M Tubbal, Asem Elarabi, Abdelmonem Etabeb, Hasan Marah, Khaled Beneljankou, Mosbah Bellid, Riyadh El-Bouaishi, Ahmed Amer, Wesam Shita, Saleh Srabet, Akram Alkaseh, Ahmed Turkman
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper we present the conceptual design of Libyan remote sensing satellite (LibyaSat-1) and its sub-systems requirements. LibyaSat-1 is a 300 kg mini satellite, which will be used to support high resolution multi-spectral earth imaging camera to fulfill the civilian needs. This satellite will operate at LEO of 775 km and will provide a resolution of 2.5 m for the panchromatic band and 10 m for the VIS/NIR bands with 30 km swath. We have presented the mission overview, mission operation concept and mission requirements. Moreover, the System Tool Kit (STK) simulation is used to show the ground trucks …
A New Approach To Reduce The Non-Linear Characteristics Of A Stressed Power System By Using The Normal Form Technique In The Control Design Of The Excitation System, Hadi Lomei, Danny Sutanto, Kashem M. Muttaqi, Mohsen Assili
A New Approach To Reduce The Non-Linear Characteristics Of A Stressed Power System By Using The Normal Form Technique In The Control Design Of The Excitation System, Hadi Lomei, Danny Sutanto, Kashem M. Muttaqi, Mohsen Assili
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, a new approach is presented to reduce the nonlinear characteristics of a stressed power system by reducing its second-order modal interaction through retuning some parameters of the generator excitation system. In order to determine the second-order modal interaction of the system, a new index on nonlinearity is developed using normal form theory. Using the proposed index of nonlinearity, a sensitivity function is formed to indicate the most effective excitation system parameters in the nonlinear behavior of the system. These dominant parameters are tuned to reduce the second-order modal interaction of the system and to reduce the index …
Multi-Phase Variety Trials Using Both Composite And Individual Replicate Samples: A Model-Based Design Approach, Alison B. Smith, David G. Butler, C R. Cavanagh, Brian R. Cullis
Multi-Phase Variety Trials Using Both Composite And Individual Replicate Samples: A Model-Based Design Approach, Alison B. Smith, David G. Butler, C R. Cavanagh, Brian R. Cullis
Faculty of Engineering and Information Sciences - Papers: Part A
The present paper provides an approach for the design and analysis of variety trials that are used to obtain quality trait data. These trials are multi-phase in nature, comprising a field phase followed by one or more laboratory phases. Typically the laboratory phases are costly relative to the field phase and this imposes a limit on the number of samples that can be tested. Historically, this has been achieved by sacrificing field replication, either by testing a single replicate plot for each variety or a single composite sample, obtained by combining material from several field replicates. An efficient statistical analysis …
Design Of Geometric Parameters Of A Double-Sided Linear Induction Motor With Ladder Secondary And A Consideration For Reducing Cogging Force, Mochammad Rusli, Christopher David Cook
Design Of Geometric Parameters Of A Double-Sided Linear Induction Motor With Ladder Secondary And A Consideration For Reducing Cogging Force, Mochammad Rusli, Christopher David Cook
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, design of the physical of double-sided linear induction motor with ladder secondary is presented. It has aim to obtain the high-precision of DSLIM for the linear slow speed applications. One of limiting factor for precision linear movement is cogging force. The efforts in reducing the cogging action in rotary induction motor has been conducted very well. However, the cogging force reduction in the DSLIM with ladder secondary has not been done before. The DSLIM provide a great advantages for LIM-driven wheel vehicles for specific applications, for example vehicles that are used in over short distances, e.g. at …
Optimal Design For Energy-Efficient Per-Subcarrier Antenna Selection Mimo–Ofdm Wireless Systems, Ngoc Phuc Le, Le Chung Tran, Farzad Safaei
Optimal Design For Energy-Efficient Per-Subcarrier Antenna Selection Mimo–Ofdm Wireless Systems, Ngoc Phuc Le, Le Chung Tran, Farzad Safaei
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we consider a novel optimal design for per-subcarrier antenna selection multi-input multi-output orthogonal frequency division multiplexing systems from an energy-efficiency perspective. The optimal number of antennas, i.e., the number of radio frequency chains, that needs to be built-in on a transmitter to achieve the maximum energy-efficiency is determined. Specifically, an optimization problem for maximizing the average energy-efficiency with respect to the number of antennas is formulated. To solve this optimization problem, we first derive a closed-form formula expressing the cost function (i.e., the average energy-efficiency) as a function of the number of antennas. Search algorithms are then …
Inclusion Of Mobile Telephone Numbers Into An Ongoing Population Health Survey In New South Wales, Australia, Using An Overlapping Dual-Frame Design: Impact On The Time Series, Margo Barr, Raymond A. Ferguson, David G. Steel
Inclusion Of Mobile Telephone Numbers Into An Ongoing Population Health Survey In New South Wales, Australia, Using An Overlapping Dual-Frame Design: Impact On The Time Series, Margo Barr, Raymond A. Ferguson, David G. Steel
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Performance Based Seismic Assessment Of Bridges Designed According To Canadian Highway Bridge Design Code, M Neaz Sheikh, Frederic Legeron
Performance Based Seismic Assessment Of Bridges Designed According To Canadian Highway Bridge Design Code, M Neaz Sheikh, Frederic Legeron
Faculty of Engineering and Information Sciences - Papers: Part A
Recent research efforts have focused on the development of performance based seismic design methodologies for structures. However, the seismic design rules prescribed in the current Canadian Highway Bridge Design Code (CHBDC) is based largely on force based design principles. Although a set of performance requirements (performance objectives) for different return period earthquake events have been specified, there is no explicit requirement in the CHBDC to check the attainment of such performance objectives for the designed bridges. Also, no engineering parameters have been assigned to the specified performance objectives. This paper correlates seismic performance objectives (both qualitative and quantitative) with engineering …
Optimal Design Of Vertical Ground Heat Exchangers By Using Entropy Generation Minimization Method And Genetic Algorithms, Su Huang, Zhenjun Ma, Paul Cooper
Optimal Design Of Vertical Ground Heat Exchangers By Using Entropy Generation Minimization Method And Genetic Algorithms, Su Huang, Zhenjun Ma, Paul Cooper
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents the development and validation of an optimal design methodology for vertical U-tube ground heat exchangers (GHEs) used in HVAC systems. The dimensionless entropy generation number obtained by scaling the entropy generation due to heat transfer and pressure drop, on the ratio of the heat transfer rate to the average fluid temperature of vertical GHEs is employed as the objective function. Five design variables are first selected based on the global sensitivity analysis and then optimized by a genetic algorithm optimization technique. The entropy generation process combines the heat transfer and fluid mechanics with thermodynamic analysis. A case …
Global Intermodal Liner Shipping Network Design, Zhiyuan Liu, Qiang Meng, Shuaian Wang, Zhuo Sun
Global Intermodal Liner Shipping Network Design, Zhiyuan Liu, Qiang Meng, Shuaian Wang, Zhuo Sun
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a holistic analysis for the network design problem of the intermodal liner shipping system. Existing methods for liner shipping network design mainly deal with port-to-port demand. However, most of the demand has inland origins and/or destinations. Thus, it is necessary to cope with inland origin-destination (OD) pairs involving a change in transport mode from inland transportation to maritime shipping. A method is first proposed to convert inland OD demand to port-to-port demand. Then, a framework for global intermodal liner shipping network design is proposed. Finally, the proposed methodology is applied to and numerically verified by a large-scale …
Small Field In-Air Output Factors: The Role Of Miniphantom Design And Dosimeter Type, Kirbie Warrener, Benjamin Hug, Paul Liu, Anna Ralston, Martin A. Ebert, David Mckenzie, Natalka Suchowerska
Small Field In-Air Output Factors: The Role Of Miniphantom Design And Dosimeter Type, Kirbie Warrener, Benjamin Hug, Paul Liu, Anna Ralston, Martin A. Ebert, David Mckenzie, Natalka Suchowerska
Faculty of Engineering and Information Sciences - Papers: Part A
The commissioning of treatment planning systems and beam modeling requires measured input parameters. The measurement of relative output in-air, Sc is particularly difficult for small fields. The purpose of this study was to investigate the influence of miniphantom design and detector selection on measured Sc values for small fields and to validate the measurements against Monte Carlo simulations. Measurements were performed using brass caps (with sidewalls) or tops (no sidewalls) of varying heights and widths. The performance of two unshielded diodes (60012 and SFD), EBT2 radiochromic film, and a fiber optic dosimeter (FOD) were compared for fields defined by MLCs …
Design And Development Of A Novel Displacement Differential Self-Induced Magnetorheological Damper, Guoliang Hu, Yi Ru, Weihua Li
Design And Development Of A Novel Displacement Differential Self-Induced Magnetorheological Damper, Guoliang Hu, Yi Ru, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
This article presents the development of a novel magnetorheological damper which has a self-sensing ability. In this study, a linear variable differential sensor, which was based on the electromagnetic induction mechanism, was integrated with a conventional magnetorheological damper. The working principle, configuration, and prototype of the displacement differential self-induced magnetorheological damper based on the integrated linear variable differential sensor technology were presented. A mathematical model of the proposed displacement differential self-induced magnetorheological damper was established. The finite element model was built with two-dimensional Maxwell software and the magnetic simulations were presented. With this approach, the influence of the flux leakage, …
Influence Of Pallets On The Behaviour And Design Of Steel Drive-In Racks, Benoit Gilbert, Lip H. Teh, Romain X. Badet, Kim Rasmussen
Influence Of Pallets On The Behaviour And Design Of Steel Drive-In Racks, Benoit Gilbert, Lip H. Teh, Romain X. Badet, Kim Rasmussen
Faculty of Engineering and Information Sciences - Papers: Part A
This paper analyses the influence of horizontal bracing restraints provided by the friction between pallet bases and rail beams on the static behaviour and design of steel drive-in storage racks. The pallet bracing restraints are shown to significantly influence the structural behaviour of the rack, and their effect on the bending moment distribution of the uprights is studied in the paper. The 2D single upright model proposed by Godley is improved in this study by including the restraints provided by the plan flexural stiffness of the rail beams and the friction between the pallets and rail beams. The improved 2D …
Geometric Design Optimization For Dynamic Response Problem Of Continuous Reinforced Concrete Beams, Pezhman Sharafi, Muhammad Hadi, Lip H. Teh
Geometric Design Optimization For Dynamic Response Problem Of Continuous Reinforced Concrete Beams, Pezhman Sharafi, Muhammad Hadi, Lip H. Teh
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a computer-aided design method for conceptual geometric layout optimization of multispan RC beams for any type of dynamic responses. A key feature of the paper is the development of a new cost-optimization method for geometric layout problems that take both cost parameters and dynamic responses into account to achieve an optimum design along with acceptable dynamic performance of RC beams. This method takes advantage of employing a new optimization formulation that considerably simplifies the preliminary layout design computations. It focuses on minimizing the structural cost subject to constraints on eigenfrequencies, modal shapes, and the static and dynamic …
Optimal Design Of Semi Active Control For Adjacent Buildings Connected By Mr Damper Based On Integrated Fuzzy Logic And Multi-Objective Genetic Algorithm, Mehmet Uz, Muhammad N. S Hadi
Optimal Design Of Semi Active Control For Adjacent Buildings Connected By Mr Damper Based On Integrated Fuzzy Logic And Multi-Objective Genetic Algorithm, Mehmet Uz, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part A
An optimal design strategy based on genetic algorithms (GA) is proposed for nonlinear hysteretic control devices that prevent pounding damage and achieve the best results in seismic response mitigation of two adjacent structures. An integrated fuzzy controller is used in order to provide the interactive relationships between damper forces and input voltages for MR dampers based on the modified Bouc-Wen model. Furthermore, Linear Quadratic Regulator (LQR) and H2/LQG (Linear Quadratic Gaussian) controllers based on clipped voltage law (CVL) are also used to compare the results obtained by fuzzy controller. This study employs the main objectives of the optimal design that …
Liner Ship Route Schedule Design With Port Time Windows, Shuaian Wang, Abdurahim Alharbi, Pamela Davy
Liner Ship Route Schedule Design With Port Time Windows, Shuaian Wang, Abdurahim Alharbi, Pamela Davy
Faculty of Engineering and Information Sciences - Papers: Part A
This paper examines a practical tactical liner ship route schedule design problem, which is the determination of the arrival and departure time at each port of call on the ship route. When designing the schedule, the availability of each port in a week, i.e., port time window, is incorporated. As a result, the designed schedule can be applied in practice without or with only minimum revisions. This problem is formulated as a mixed-integer nonlinear nonconvex optimization model. In view of the problem structure, an efficient holistic solution approach is proposed to obtain global optimal solution. The proposed solution method is …
Design And Evaluation Of A Linear Damper Working With Mr Shear Thickening Fluids, Tongfei Tian, Weihua Li, Masami Nakano
Design And Evaluation Of A Linear Damper Working With Mr Shear Thickening Fluids, Tongfei Tian, Weihua Li, Masami Nakano
Faculty of Engineering and Information Sciences - Papers: Part A
Magnetorheological (MR) materials and shear thickening fluids are both smart material and their combination could offer both MR and ST effects. This study looks at the properties and behaviour of magnetorheological shear thickening fluid (MRSTF) in particular whilst applied as a semi-active energy absorber. A device with two forms of varying vibration control has been created and measured. The result shows that this MRSTF filled damper showed both MR and properties.
Brachyview, A Novel Inbody Imaging System For Hdr Prostate Brachytherapy: Design And Monte Carlo Feasibility Study, M Safavi-Naeini, Z Han, D Cutajar, S Guatelli, M Petasecca, M L. F Lerch, D. Franklin, J Jakubek, S Pospisil, J Bucci, M Zaider, Anatoly B. Rosenfeld
Brachyview, A Novel Inbody Imaging System For Hdr Prostate Brachytherapy: Design And Monte Carlo Feasibility Study, M Safavi-Naeini, Z Han, D Cutajar, S Guatelli, M Petasecca, M L. F Lerch, D. Franklin, J Jakubek, S Pospisil, J Bucci, M Zaider, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
Purpose: High dose rate (HDR) brachytherapy is a form of radiation therapy for treating prostate cancer whereby a high activity radiation source is moved between predefined positions inside applicators inserted within the treatment volume. Accurate positioning of the source is essential in delivering the desired dose to the target area while avoiding radiation injury to the surrounding tissue. In this paper, HDR BrachyView, a novel inbody dosimetric imaging system for real time monitoring and verification of the radioactive seed position in HDR prostate brachytherapy treatment is introduced. The current prototype consists of a 15 × 60 mm2 silicon pixel detector …
Sample Design Using Imperfect Design Data, Robert Graham Clark
Sample Design Using Imperfect Design Data, Robert Graham Clark
Faculty of Engineering and Information Sciences - Papers: Part A
A well-designed sampling plan can greatly enhance the information that can be produced from a survey. Once a broad sample design is identified, specific design parameters such as sample sizes and selection probabilities need to be chosen. This is typically achieved using an optimal sample design, which minimizes the variance of a key statistic or statistics, expressed as a function of design parameters and population characteristics, subject to a cost constraint. In practice, only imprecise estimates of population characteristics are available, but the effects of this variability are usually ignored. A general approach to sample allocation allowing for imprecise design …
Application Of Multiple Objective Particle Swarm Optimisation In The Design Of Damaged Offshore Mooring Systems, Zhuo Wang, Timothy J. Mccarthy, M Neaz Sheikh
Application Of Multiple Objective Particle Swarm Optimisation In The Design Of Damaged Offshore Mooring Systems, Zhuo Wang, Timothy J. Mccarthy, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part A
The offshore hydrocarbon industry operates in more hostile environments as more of marginal fields become economically viable. This means that more floating production systems and economical mooring systems will be needed. With this increase in the use of marginal fields goes the need to re-use vessels and moorings. Floating production systems, such as FPSO's, need to survive extreme events and extreme damage conditions. When one mooring line is damaged, the remaining ones must be sufficient to avoid a complete failure and still protect critical components such as the riser. This paper looks into applying an evolutionary optimisation technique, namely multiple …
Speed-Based Toll Design For Cordon-Based Congestion Pricing Scheme, Zhiyuan Liu, Qiang Meng, Shuaian Wang
Speed-Based Toll Design For Cordon-Based Congestion Pricing Scheme, Zhiyuan Liu, Qiang Meng, Shuaian Wang
Faculty of Engineering and Information Sciences - Papers: Part A
The cordon-based Electronic Road Pricing (ERP) system in Singapore adopts the average travel speed as an index for evaluating the traffic congestion within a cordon area, and the maintenance of the average travel speed within a satisfactory range is taken as the objective of the toll adjustment. To formulate this practical speed-based toll design problem, this paper proposes a mathematical programming with equilibrium constraint (MPEC) model with the objective of maintaining the traffic condition in the cordon area. In the model, the network users' route choice behavior is assumed to follow probit-based stochastic user equilibrium with elastic demand, asymmetric link …
Optimal Design Of An Ultrasmall Soi-Based 1 X 8 Flat-Top Awg By Using An Mmi, Hongqiang Li, Yaoting Bai, Xiaoyi Dong, Enbang Li, Yang Li, Yu Liu, Wenqian Zhou
Optimal Design Of An Ultrasmall Soi-Based 1 X 8 Flat-Top Awg By Using An Mmi, Hongqiang Li, Yaoting Bai, Xiaoyi Dong, Enbang Li, Yang Li, Yu Liu, Wenqian Zhou
Faculty of Engineering and Information Sciences - Papers: Part A
Four methods based on a multimode interference (MMI) structure are optimally designed to flatten the spectral response of silicon-on-insulator- (SOI-) based arrayed-waveguide grating (AWG) applied in a demodulation integration microsystem. In the design for each method, SOI is selected as the material, the beam propagation method is used, and the performances (including the 3 dB passband width, the crosstalk, and the insertion loss) of the flat-top AWG are studied. Moreover, the output spectrum responses of AWGs with or without a flattened structure are compared. The results show that low insertion loss, crosstalk, and a flat and efficient spectral response are …
Rail Track Infrastructure For Enhanced Speed - Analysis Design And Construction Challenges, Buddhima Indraratna, Sanjay Shrawan Nimbalkar, Jayan Sylaja J S Vinod
Rail Track Infrastructure For Enhanced Speed - Analysis Design And Construction Challenges, Buddhima Indraratna, Sanjay Shrawan Nimbalkar, Jayan Sylaja J S Vinod
Faculty of Engineering and Information Sciences - Papers: Part A
Rail is one of the largest transportation modes offering freight and passenger traffic in rapidly developing nations, including India. Conscious efforts to improve productivity, modernization and technology upgrading have led to an impressive growth in railways. Large-scale physical modeling, sophisticated numerical modeling and full-scale field monitoring often provide significant knowledge to better understand track performance and to extend the current state-of-the-art in design. A series of large-scale laboratory tests were conducted to establish relationships between (i) ballast breakage and train speed, (ii) ballast fouling and strength and (iii) interface strength and geogrids. Comprehensive field trials were carried out on instrumented …