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Articles 31 - 60 of 402
Full-Text Articles in Engineering
Optimizing Distributed Generation Parameters Through Economic Feasibility Assessment, Kashem M. Muttaqi, An D. T Le, Jamshid Aghaei, Esmaeil Mahboubi-Moghaddam, Michael Negnevitsky, Gerard Ledwich
Optimizing Distributed Generation Parameters Through Economic Feasibility Assessment, Kashem M. Muttaqi, An D. T Le, Jamshid Aghaei, Esmaeil Mahboubi-Moghaddam, Michael Negnevitsky, Gerard Ledwich
Faculty of Engineering and Information Sciences - Papers: Part A
To meet the fast growth of electricity demand, the traditional network solution tends to expand existing substations, build more new substations, and build transmission lines. Distributed Generation (DG) is posed as an alternative method for the network providers not only to accommodate the load increase and relieve network overload, but also to offer other additional technical and economic benefits. This paper addresses the issue of DG planning and has proposed a technique for optimizing the DG size and location to minimize the overall investment and operational cost of the system. The proposed optimization methodology assesses the compatibility of different generation …
Renewable Energy Management In A Remote Area Using Modified Gravitational Search Algorithm, Sahand Ghavidel, Jamshid Aghaei, Kashem M. Muttaqi, Alireza Heidari
Renewable Energy Management In A Remote Area Using Modified Gravitational Search Algorithm, Sahand Ghavidel, Jamshid Aghaei, Kashem M. Muttaqi, Alireza Heidari
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, a small remote area which is located in Nigeria has been considered as a model to be tested by a managing scheme for providing both electricity and water. In this strategy, the groundwater is pumped into a water tank which can be later used for supplying required irrigation and drinking water. A PAT (Pump as Turbine) is used as a hybrid system for supplying electricity and water as well as storing water in the water tank. Also, a PV (photovoltaic plant), a package of batteries (BAT) in addition to a diesel ICE (internal combustion engine) are used …
Seismic Rehabilitation Of Reinforced Concrete Beam-Column Joints By Bonding With Concrete Covers And Wrapping With Frp Composites, Muhammad N. S Hadi, Tung M. Tran
Seismic Rehabilitation Of Reinforced Concrete Beam-Column Joints By Bonding With Concrete Covers And Wrapping With Frp Composites, Muhammad N. S Hadi, Tung M. Tran
Faculty of Engineering and Information Sciences - Papers: Part A
This study evaluates the effectiveness of a new method for seismic strengthening of exterior RC beam-column connections and develops a joint shear strength model for the strengthened connections. Four RC exterior connections without transverse reinforcement at the joints were cast and tested under reverse cyclic loading. The first connection was tested as the control specimen while the three remaining connections were glued with concrete covers around the columns at the joint area to modify them from square to circular sections and then they were wrapped with different ratios of CFRP for strengthening. The joint shear strength model was developed based …
Modelling Long-Term Deformation Of Granular Soils Incorporating The Concept Of Fractional Calculus, Yifei Sun, Yang Xiao, Changjie Zheng, Khairul Fikry Hanif
Modelling Long-Term Deformation Of Granular Soils Incorporating The Concept Of Fractional Calculus, Yifei Sun, Yang Xiao, Changjie Zheng, Khairul Fikry Hanif
Faculty of Engineering and Information Sciences - Papers: Part A
Many constitutive models exist to characterise the cyclic behaviour of granular soils but can only simulate deformations for very limited cycles. Fractional derivatives have been regarded as one potential instrument for modelling memory-dependent phenomena. In this paper, the physical connection between the fractional derivative order and the fractal dimension of granular soils is investigated in detail. Then a modified elasto-plastic constitutive model is proposed for evaluating the long-term deformation of granular soils under cyclic loading by incorporating the concept of factional calculus. To describe the flow direction of granular soils under cyclic loading, a cyclic flow potential considering particle breakage …
Phosphorus Recovery From Digested Sludge Centrate Using Seawater-Driven Forward Osmosis, Ashley J. Ansari, Faisal I. Hai, William E. Price, Long D. Nghiem
Phosphorus Recovery From Digested Sludge Centrate Using Seawater-Driven Forward Osmosis, Ashley J. Ansari, Faisal I. Hai, William E. Price, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
In this study, we demonstrate a novel seawater-driven forward osmosis (FO) process to recover calcium phosphate precipitates from digested sludge centrate without any chemical addition and draw solute regeneration. The FO process effectively pre-concentrated phosphate and calcium in the digested sludge centrate. Spontaneous precipitation of calcium phosphate minerals in the digested sludge centrate was achieved by the sustained concentrative action of the FO process and the gradual pH increase due to the diffusion of protons to the draw solution. Pre-concentrating digested sludge centrate by three-fold resulted in a 92% recovery of phosphate via precipitation. The phosphate precipitate only constituted 3% …
Application Of Advanced Bounding Surface Plasticity Model In Static And Seismic Analyses Of Zipingpu Dam, Mojtaba E. Kan, Hossein A. Taiebat
Application Of Advanced Bounding Surface Plasticity Model In Static And Seismic Analyses Of Zipingpu Dam, Mojtaba E. Kan, Hossein A. Taiebat
Faculty of Engineering and Information Sciences - Papers: Part A
The strong ground motion of the Wenchuan earthquake that hit the Zipingpu Dam in China in 2008 has provided an excellent benchmark to study the behaviour of large modern rockfill dams subjected to seismic loading. The performance of the dam during construction and prior to and after the earthquake loading has been recorded with good accuracy, and provides a reliable database to examine the reliability of available constitutive models and numerical methods in predicting the static and dynamic behaviour of embankment dams. In this paper, an advanced bounding surface plasticity model has been used in a series of numerical analyses …
Information-How, Nir Fresco
Information-How, Nir Fresco
Faculty of Engineering and Information Sciences - Papers: Part A
The distinction between knowledge-how and knowledge-that has long been debated in the literature. This distinction can, arguably, be better understood in terms of a more fundamental distinction between information-how and information-that. Informationhow is prescriptive and informs a cognitive agent about which action(s) can be performed to achieve a particular outcome. Information-that is descriptive and informs the agent about events, objects and states of affairs in the world. Since the latter has received more attention in the literature, this article focuses on the former. We offer a new account of information-how that answers the question: 'When do data qualify as information-how?'.
Efficient Dynamic Threshold Identity-Based Encryption With Constant-Size Ciphertext, Willy Susilo, Fuchun Guo, Yi Mu
Efficient Dynamic Threshold Identity-Based Encryption With Constant-Size Ciphertext, Willy Susilo, Fuchun Guo, Yi Mu
Faculty of Engineering and Information Sciences - Papers: Part A
This paper revisits the notion of dynamic threshold identity-based encryption, due to the recent practical interest. In this notion, an encryptor selects n recipients and a threshold value t for the creation of the ciphertext. The plaintext can only be recovered if at least t receivers cooperate. The key issue in this notion is its dynamicity, where after the users enroll to the system, the sender can dynamically select the set of recipients as well as dynamically set the threshold t upon the creation of the ciphertext. Another essential feature of this notion is the need for a constant-size ciphertext. …
Beam Perturbation Characteristics Of A 2d Transmission Silicon Diode Array, Magic Plate, Z A. Alrowaili, Michael L. F Lerch, Marco Petasecca, Martin Carolan, Peter E. Metcalfe, Anatoly B. Rosenfeld
Beam Perturbation Characteristics Of A 2d Transmission Silicon Diode Array, Magic Plate, Z A. Alrowaili, Michael L. F Lerch, Marco Petasecca, Martin Carolan, Peter E. Metcalfe, Anatoly B. Rosenfeld
Faculty of Engineering and Information Sciences - Papers: Part A
The main objective of this study is to demonstrate the performance characteristics of the Magic Plate (MP) system when operated upstream of the patient in transmission mode (MPTM). The MPTM is an essential component of a real-time QA system designed for operation during radiotherapy treatment. Of particular interest is a quantitative study into the influence of the MP on the radiation beam quality at several field sizes and linear accelerator potential differences. The impact is measured through beam perturbation effects such as changes in the skin dose and/or percentage depth dose (PDD) (both in and out of field). The MP …
Synthesis Of Sic Whiskers By Vls And Vs Process, Xiang Li, Guangqing Zhang, Ragnar Tronstad, Oleg Ostrovski
Synthesis Of Sic Whiskers By Vls And Vs Process, Xiang Li, Guangqing Zhang, Ragnar Tronstad, Oleg Ostrovski
Faculty of Engineering and Information Sciences - Papers: Part A
This study investigates the mechanisms of SiC whisker formation in the carbothermal reduction of quartz to SiC in different gas atmospheres. Reduction of quartz by graphite was studied in Ar, H2, and CH4-H2-Ar gas mixture in a laboratory fixed bed reactor. The reduction products were characterised by XRD, SEM and TEM. Whiskers were not formed in the carbothermal reduction of quartz in argon. Two types of SiC whiskers were observed in the carbothermal reduction of quartz in H2 and CH4-H2-Ar gas mixture. In the process of reduction at 1400-1600 °C in H2 and at 1200-1600 °C in CH4-H2-Ar gas mixture, …
Bottom-Up Microfabrication Process For Individually Controlled Conjugated Polymer Actuators, Alexandre Khaldi, Ali Maziz, Gursel Alici, Geoffrey M. Spinks, Edwin W. Jager
Bottom-Up Microfabrication Process For Individually Controlled Conjugated Polymer Actuators, Alexandre Khaldi, Ali Maziz, Gursel Alici, Geoffrey M. Spinks, Edwin W. Jager
Faculty of Engineering and Information Sciences - Papers: Part A
Handling of soft and fragile sub-millimeter sized samples such as cells and tissues requires new tools that allow delicate manipulation. Conducting polymer actuators show unique characteristics suitable to driving such manipulators, however despite their potential, the current fabrication method of the trilayer structures does not allow constructing advanced micromanipulators operating in air using this technology. Here we show a novel bottom-up microfabrication process for conjugated polymer trilayer actuators using various solid polymer electrolytes. In addition, the process design integrates contact pads, which has been an issue for small scale conducting polymer actuators. The microfabrication process starts with a patterned layer …
A Strategy For Configuration Of An Integrated Flexible Sulfur Cathode For High-Performance Lithium-Sulfur Batteries, Hongqiang Wang, Wenchao Zhang, Hua-Kun Liu, Zaiping Guo
A Strategy For Configuration Of An Integrated Flexible Sulfur Cathode For High-Performance Lithium-Sulfur Batteries, Hongqiang Wang, Wenchao Zhang, Hua-Kun Liu, Zaiping Guo
Faculty of Engineering and Information Sciences - Papers: Part A
Lithium-sulfur batteries are regarded as promising candidates for energy storage devices owing to their high theoretical energy density. The practical application is hindered, however, by low sulfur utilization and unsatisfactory capacity retention. Herein, we present a strategy for configuration of the sulfur cathode, which is composed of an integrated carbon/sulfur/carbon sandwich structure on polypropylene separator that is produced using the simple doctor-blade technique. The integrated electrode exhibits excellent flexibility and high mechanical strength. The upper and bottom carbon layers of the sandwich-structured electrode not only work as double current collectors, which effectively improve the conductivity of the electrode, but also …
Mechanical Properties And Tribological Behavior Of Aluminum Matrix Composites Reinforced With In-Situ Alb2 Particles, Linlin Yuan, Jingtao Han, Jing Liu, Zhengyi Jiang
Mechanical Properties And Tribological Behavior Of Aluminum Matrix Composites Reinforced With In-Situ Alb2 Particles, Linlin Yuan, Jingtao Han, Jing Liu, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part A
Aluminum matrix composites (AMCs) reinforced with in-situ AlB2 particles have been fabricated using a combination of powder metallurgy, hot rolling and solution treatment. The effects of boron content (7 and 12 wt%), hot rolling and heat treatment parameters on the microstructures and mechanical properties of the composites were investigated by means of scanning electron microscopy (SEM), tensile test and micro-hardness measurements. The friction coefficient, wear behavior and scratch morphology of the AMCs and pure aluminum were also studied using scratch tests. The hardness and wear properties are higher in a case of composites when compared to unreinforced matrix material.
Occurrence Of Trace Organic Contaminants In Wastewater Sludge And Their Removals By Anaerobic Digestion, Shufan Yang, Faisal I. Hai, William E. Price, James Mcdonald, Stuart J. Khan, Long D. Nghiem
Occurrence Of Trace Organic Contaminants In Wastewater Sludge And Their Removals By Anaerobic Digestion, Shufan Yang, Faisal I. Hai, William E. Price, James Mcdonald, Stuart J. Khan, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study aims to evaluate the occurrence of trace organic contaminants (TrOCs) in wastewater sludge and their removal during anaerobic digestion. The significant occurrence of 18 TrOCs in primary sludge was observed. These TrOCs occurred predominantly in the solid phase. Some of these TrOCs (e.g. paracetamol, caffeine, ibuprofen and triclosan) were also found at high concentrations (>10,000. ng/L) in the aqueous phase. The overall removal of TrOCs (from both the aqueous and solid phase) by anaerobic digestion was governed by their molecular structure (e.g. the presence/absence of electron withdrawing/donating functional groups). While an increase in sludge retention time (SRT) …
Modelling Of Geocell-Reinforced Subballast Subjected To Cyclic Loading, M. Mahdi Biabani, Buddhima Indraratna, Ngoc Trung Ngo
Modelling Of Geocell-Reinforced Subballast Subjected To Cyclic Loading, M. Mahdi Biabani, Buddhima Indraratna, Ngoc Trung Ngo
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents the experimental and numerical studies of geocell-reinforced subballast subjected to cyclic loading. A series of laboratory experiments were conducted using a large-scale prismoidal triaxial apparatus that was subjected to relatively low confining pressures of σ'3 = 10-30 kPa and a frequency of f = 10 Hz. Numerical simulations were performed using the commercial finite element package ABAQUS in three dimensions to realistically model cellular confinement, and to study the effectiveness of geocell reinforcement on subballast. A cyclic loading with a periodic and positive full-sine waveform was adopted to model the geocell-reinforced subballast, which is similar to the …
Load-Deformation Behaviour Of A Stone Column Using The Coupled Dem-Fdm Method, N T. Ngo, B Indraratna, C Rujikiatkamjorn
Load-Deformation Behaviour Of A Stone Column Using The Coupled Dem-Fdm Method, N T. Ngo, B Indraratna, C Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a novel coupled model of discrete element method (DEM) and finite difference method (FDM) to investigate the load-deformation of stone columns reinforced soft clay. In the proposed model, the soft clay domain was modelled by the continuum method using FLAC and stone column was modelled by the discrete element method using PFC2D. Algorithms and mathematical framework to assist coupling between the two domains were introduced, in which the DEM transfers forces and moment to the FDM and then the FDM provides an update of displacements to the DEM. The predicted load-deformation responses obtained from the coupling model …
Experimental And Discrete Element Modelling Of Geocell-Stabilized Subballast Subjected To Cyclic Loading, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn, M. Mahdi Biabani
Experimental And Discrete Element Modelling Of Geocell-Stabilized Subballast Subjected To Cyclic Loading, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn, M. Mahdi Biabani
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a study of the load-deformation behaviour of geocell-stabilised sub-ballast subjected to cyclic loading using a novel track process simulation apparatus. The tests were conducted at frequencies varying from 10-30 Hz. This frequency range is generally representative of Australian Standard Gauge trains operating up to 160 km/h. The discrete element method (DEM) was also used to model geocell-reinforced sub-ballast under plane strain conditions. The geocell was modelled by connecting a group of small circular balls together to form the desired geometry and aperture using contact and parallel bonds. Tensile and bending tests were carried out to calibrate the …
Effect Of Different Frp Wrapping Arrangements On The Confinement Mechanism, Thong M. Pham, Jim Youssed, Muhammad N. S Hadi, Tung M. Tran
Effect Of Different Frp Wrapping Arrangements On The Confinement Mechanism, Thong M. Pham, Jim Youssed, Muhammad N. S Hadi, Tung M. Tran
Faculty of Engineering and Information Sciences - Papers: Part A
This study aims to investigate the structural behavior and failure modes of fiber-reinforced-polymer (FRP) confined concrete wrapped with different FRP arrangements. A total of twenty four 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 arrangements. They include fully wrapped, partially wrapped and non-uniformly wrapped concrete cylinders. The nonuniformly wrapped concrete cylinders provided higher compressive strengths and strain for FRP-confined concrete, in comparison with conventional fully wrapping arrangements. The effect of confinement level on the effectiveness of FRP confinement …
Application Of Artificial Neural Network Coupled With Genetic Algorithm And Simulated Annealing To Solve Groundwater Inflow Problem To An Advancing Open Pit Mine, Saeed Bahrami, Faramarz Doulati Ardejani, Ernest Baafi
Application Of Artificial Neural Network Coupled With Genetic Algorithm And Simulated Annealing To Solve Groundwater Inflow Problem To An Advancing Open Pit Mine, Saeed Bahrami, Faramarz Doulati Ardejani, Ernest Baafi
Faculty of Engineering and Information Sciences - Papers: Part A
In this study, hybrid models are designed to predict groundwater inflow to an advancing open pit mine and the hydraulic head (HH) in observation wells at different distances from the centre of the pit during its advance. Hybrid methods coupling artificial neural network (ANN) with genetic algorithm (GA) methods (ANN-GA), and simulated annealing (SA) methods (ANN-SA), were utilised. Ratios of depth of pit penetration in aquifer to aquifer thickness, pit bottom radius to its top radius, inverse of pit advance time and the HH in the observation wells to the distance of observation wells from the centre of the pit …
Pricing European Options With Stochastic Volatility Under The Minimal Entropy Martingale Measure, Xin-Jiang He, Song-Ping Zhu
Pricing European Options With Stochastic Volatility Under The Minimal Entropy Martingale Measure, Xin-Jiang He, Song-Ping Zhu
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, a closed-form pricing formula in the form of an infinite series for European call options is derived for the Heston stochastic volatility model under a chosen martingale measure. Given that markets with the stochastic volatility are incomplete, there exists a number of equivalent martingale measures and consequently investors face a problem of making a choice of appropriate measure when they price options. The one we adopt here is the so-called minimal entropy martingale measure shown to be related to the expected utility maximization theory (Frittelli 2000 Math. Finance 10(1), 39-52) and the financial rationality for choosing this …
A Schauder Estimate For Stochastic Pdes, Kai Du, Jiakun Liu
A Schauder Estimate For Stochastic Pdes, Kai Du, Jiakun Liu
Faculty of Engineering and Information Sciences - Papers: Part A
Considering stochastic partial differential equations of parabolic type with random coefficients in vector-valued Hölder spaces, we establish a sharp Schauder theory. The existence and uniqueness of solutions to the Cauchy problem is obtained.
The Primitive Ideals Of Some Etale Groupoid C*-Algebras, Aidan Sims, Dana P. Williams
The Primitive Ideals Of Some Etale Groupoid C*-Algebras, Aidan Sims, Dana P. Williams
Faculty of Engineering and Information Sciences - Papers: Part A
We consider the Deaconu-Renault groupoid of an action of a finitely generated free abelian monoid by local homeomorphisms of a locally compact Hausdorff space. We catalogue the primitive ideals of the associated groupoid C∗-algebra. For a special class of actions we describe the Jacobson topology.
Purely Infinite Simple C*-Algebras That Are Principal Groupoid C*-Algebras, Jonathan H. Brown, Lisa Orloff Clark, Adam Sierakowski, Aidan Sims
Purely Infinite Simple C*-Algebras That Are Principal Groupoid C*-Algebras, Jonathan H. Brown, Lisa Orloff Clark, Adam Sierakowski, Aidan Sims
Faculty of Engineering and Information Sciences - Papers: Part A
From a suitable groupoid G, we show how to construct an amenable principal groupoid whose C*-algebra is a Kirchberg algebra which is KK-equivalent to C*(G). Using this construction, we show by example that many UCT Kirchberg algebras can be realised as the C*-algebras of amenable principal groupoids.
Investigation Of Hydrogen Assisted Cracking In Acicular Ferrite Using Site-Specific Micro-Fracture Tests, Walter L. Costin, Oliver Lavigne, Andrei Kotousov, Reza Ghomashchi, Valerie M. Linton
Investigation Of Hydrogen Assisted Cracking In Acicular Ferrite Using Site-Specific Micro-Fracture Tests, Walter L. Costin, Oliver Lavigne, Andrei Kotousov, Reza Ghomashchi, Valerie M. Linton
Faculty of Engineering and Information Sciences - Papers: Part A
Hydrogen assisted cracking (HAC) is a common type of failure mechanism that can affect a wide range of metals and alloys. Experimental studies of HAC are cumbersome due to various intrinsic and extrinsic parameters and factors (associated with stress, hydrogen and the materials microstructure) contributing to the hydrogen crack kinetics. The microstructure of many materials consists of diverse constituents with characteristic features and mechanical properties which only occur in very small material volumes. The only way to differentiate the effect of these individual constituents on the hydrogen crack kinetics is to miniaturise the testing procedures. In this paper we present …
Single Joint Robotic Orthoses For Gait Rehabilitation: An Educational Technical Review, Shahid Hussain, Prashant K. Jamwal, Mergen H. Ghayesh
Single Joint Robotic Orthoses For Gait Rehabilitation: An Educational Technical Review, Shahid Hussain, Prashant K. Jamwal, Mergen H. Ghayesh
Faculty of Engineering and Information Sciences - Papers: Part A
Robot-assisted physical gait therapy is gaining recognition among the rehabilitation engineering community. Several robotic orthoses for the treatment of gait impairments have been developed during the last 2 decades, many of which are designed to provide physical therapy to a single joint of the lower limb; these are reviewed here. The mechanism design and actuation concepts for these single joint robotic orthoses are discussed. The control algorithms developed for these robotic orthoses, which include trajectory tracking control and assist-as-needed control, are described. Finally, the mechanism design and control of single joint robotic orthoses are discussed. There is a strong need …
Field Study Of Air Conditioning And Thermal Comfort In Residential Buildings, Jungsoo Kim, Richard De Dear, Tom Parkinson, Christhina Candido, Paul Cooper, Zhenjun Ma, Wasim Saman
Field Study Of Air Conditioning And Thermal Comfort In Residential Buildings, Jungsoo Kim, Richard De Dear, Tom Parkinson, Christhina Candido, Paul Cooper, Zhenjun Ma, Wasim Saman
Faculty of Engineering and Information Sciences - Papers: Part A
The aim of this study is to better understand the external and internal drivers that affect residential air-conditioning (A/C) use decisions and occupant comfort. Field observations were carried out using instrumental measurements and smartphone questionnaires, recording householder's A/C usage patterns, indoor/outdoor climatic factors, perception of thermal comfort and adaptive behaviours.
Effective Utilization Of Available Pev Battery Capacity For Mitigation Of Solar Pv Impact And Grid Support With Integrated V2g Functionality, Md Jan E Alam, Kashem M. Muttaqi, Danny Sutanto
Effective Utilization Of Available Pev Battery Capacity For Mitigation Of Solar Pv Impact And Grid Support With Integrated V2g Functionality, Md Jan E Alam, Kashem M. Muttaqi, Danny Sutanto
Faculty of Engineering and Information Sciences - Papers: Part A
Utilizing battery storage devices in plug-in electric vehicles (PEVs) for grid support using vehicle-to-grid (V2G) concept is gaining popularity. With appropriate control strategies, the PEV batteries and associated power electronics can be exploited for solar photovoltaic (PV) impact mitigation and grid support. However, as the PEV batteries have limited capacity and the capacity usage is also constrained by transportation requirements, an intelligent strategy is necessary for an effective utilization of the available capacity for V2G applications. In this paper, a strategy for an effective utilization of PEV battery capacity for solar PV impact mitigation and grid support is proposed. A …
Encoding And Communicating Navigable Speech Soundfields, Xiguang Zheng, Christian H. Ritz, Jiangtao Xi
Encoding And Communicating Navigable Speech Soundfields, Xiguang Zheng, Christian H. Ritz, Jiangtao Xi
Faculty of Engineering and Information Sciences - Papers: Part A
This paper describes a system for encoding and communicating navigable speech soundfields for applications such as immersive audio/visual conferencing, audio surveillance of large spaces and free viewpoint television. The system relies on recording speech soundfields using compact co-incident microphone arrays that are then processed to identify sources and their spatial location using the well-known assumption that speech signals are sparse in the time-frequency domain. A low-delay Direction of Arrival (DOA)-based frequency domain sound source separation approach is proposed that requires only 250 ms of speech signal. Joint compression is achieved through a previously proposed perceptual analysis-by-synthesis spatial audio coding scheme …
High Intrinsic Sensitivity Etched Polymer Fiber Bragg Grating Pair For Simultaneous Strain And Temperature Measurements, Kishore Bhowmik, Gang-Ding Peng, Yanhua Luo, Eliathamby Ambikairajah, Vedran Lovric, William R. Walsh, Ginu Rajan
High Intrinsic Sensitivity Etched Polymer Fiber Bragg Grating Pair For Simultaneous Strain And Temperature Measurements, Kishore Bhowmik, Gang-Ding Peng, Yanhua Luo, Eliathamby Ambikairajah, Vedran Lovric, William R. Walsh, Ginu Rajan
Faculty of Engineering and Information Sciences - Papers: Part A
A sensing configuration for simultaneous measurement of strain and temperature with enhanced intrinsic sensitivity based on a fiber Bragg grating (FBG) pair with one grating inscribed in the etched and the other in unetched polymer fiber region is demonstrated. A poly (methyl methacrylate) based single-mode polymer fiber is etched to different diameters, and it is observed that etching can lead to change in the material properties of the fiber, such as Young's modulus and thermal expansion coefficient, which can play a vital role in improving its intrinsic sensing capabilities. Thus, exploiting the different strain and temperature sensitivities exhibited by etched …
Nonlocal Transistor Based On Pure Crossed Andreev Reflection In A Euo-Graphene/Superconductor Hybrid Structure, Yee Sin Ang, Lawrence Ang, C Zhang, Zhongshui Ma
Nonlocal Transistor Based On Pure Crossed Andreev Reflection In A Euo-Graphene/Superconductor Hybrid Structure, Yee Sin Ang, Lawrence Ang, C Zhang, Zhongshui Ma
Faculty of Engineering and Information Sciences - Papers: Part A
We study the interband transport in a superconducting device composed of graphene with EuO-induced exchange interaction. We show that pure crossed Andreev reflection can be generated exclusively without the parasitic local Andreev reflection and elastic cotunnelling over a wide range of bias and Fermi levels in an EuO-graphene/superconductor/EuO-graphene device. The pure nonlocal conductance exhibits rapid on-off switching and oscillatory behavior when the Fermi levels in the normal and the superconducting leads are varied. The oscillation reflects the quasiparticle propagation in the superconducting lead and can be used as a tool to probe the subgap quasiparticle mode in superconducting graphene, which …