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Articles 1 - 30 of 402

Full-Text Articles in Social and Behavioral Sciences

Phosphorus Recovery From Digested Sludge Centrate Using Seawater-Driven Forward Osmosis, Ashley J. Ansari, Faisal I. Hai, William E. Price, Long D. Nghiem Jan 2016

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 ...


Factors Governing The Pre-Concentration Of Wastewater Using Forward Osmosis For Subsequent Resource Recovery, Ashley J. Ansari, Faisal I. Hai, Wenshan Guo, Hao H. Ngo, William E. Price, Long D. Nghiem Jan 2016

Factors Governing The Pre-Concentration Of Wastewater Using Forward Osmosis For Subsequent Resource Recovery, Ashley J. Ansari, Faisal I. Hai, Wenshan Guo, Hao H. Ngo, William E. Price, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part A

This study demonstrated a technique using forward osmosis (FO) to pre-concentrate the organic matter in raw wastewater, thereby transforming low strength wastewater into an anaerobically digestible solution. The chemical oxygen demand (COD) of raw wastewater was concentrated up to approximately eightfold at a water recovery of 90%. Thus, even low strength wastewater could be pre-concentrated by FO to the range suitable for biogas production via anaerobic treatment. Excessive salinity accumulation in pre-concentrated wastewater was successfully mitigated by adopting ionic organic draw solutes, namely, sodium acetate, and EDTA-2Na. These two draw solutes are also expected to benefit the digestibility of the ...


Towards Organizing Smart Collaboration And Enhancing Teamwork Performance: A Ga-Supported System Oriented To Mobile Learning Through Cloud-Based Online Course, Geng Sun, Jun Shen Jan 2016

Towards Organizing Smart Collaboration And Enhancing Teamwork Performance: A Ga-Supported System Oriented To Mobile Learning Through Cloud-Based Online Course, Geng Sun, Jun Shen

Faculty of Engineering and Information Sciences - Papers: Part A

At present, people’s learning styles become diverse, for which mobile learning is a significant trend that enables distributed learners to achieve collaborative learning and allows them to be engaged in virtual teams to work together. In this research, we develop a system to cope with the problem in current mobile learning circumstance, where learners in virtual teams generally lack proper communications, guidance and assistances between each other. Following the theory of Kolb team learning experience, we use our system, Teamwork as a Service (TaaS), to work in conjunction with cloud-based learning management systems. This system targets at organizing a ...


A Dual Deformation Mechanism Of Grain Boundary At Different Stress Stages, Liang Zhang, Cheng Lu, Jie Zhang, A Kiet Tieu Jan 2016

A Dual Deformation Mechanism Of Grain Boundary At Different Stress Stages, Liang Zhang, Cheng Lu, Jie Zhang, A Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part A

Molecular dynamics (MD) simulation with embedded-atom method (EAM) potential was carried out to study the structure and shear response of an asymmetric tilt grain boundary in copper bicrystal. A non-planar structure with dissociated intrinsic stacking faults was observed in the grain boundary. Simulation results show that this type of structure can significantly increase the ductility of the simulation sample under shear deformation. A dual deformation mechanism of the grain boundary was observed; the grain boundary can be a source of dislocation emission and migrate itself at different stress stages. The result of this study can provide further information to understand ...


Strategies For The Development Of Three Dimensional Scaffolds From Piezoelectric Poly(Vinylidene Fluoride), Daniela M. Correia, Clarisse Ribeiro, Vitor Sencadas, L Vikingsson, M Oliver Gasch, J L. Gomez Ribelles, Gabriela Botelho, Senentxu Lanceros-Méndez Jan 2016

Strategies For The Development Of Three Dimensional Scaffolds From Piezoelectric Poly(Vinylidene Fluoride), Daniela M. Correia, Clarisse Ribeiro, Vitor Sencadas, L Vikingsson, M Oliver Gasch, J L. Gomez Ribelles, Gabriela Botelho, Senentxu Lanceros-Méndez

Faculty of Engineering and Information Sciences - Papers: Part A

Cell supports based on electroactive materials, that generate electrical signal variations as a response to mechanical deformations and vice-versa, are gaining increasing attention for tissue engineering applications. In particular, poly(vinylidene fluoride), PVDF, has been proven to be suitable for these applications in the form of films and two-dimensional membranes. In this work, several strategies have been implemented in order to develop PVDF three-dimensional scaffolds. Three processing methods, including solvent casting with particulate leaching and three-dimensional nylon, and freeze extraction with poly(vinyl alcohol) templates are presented in order to obtain three-dimensional scaffolds with different architectures and interconnected porosity. Further ...


Elastomeric And Dynamic Mno2/Cnt Core-Shell Structure Coiled Yarn Supercapacitor, Changsoon Choi, Hyeon Jun Sim, Geoffrey M. Spinks, Xavier Lepró, Ray H. Baughman, Seon Jeong Kim Jan 2016

Elastomeric And Dynamic Mno2/Cnt Core-Shell Structure Coiled Yarn Supercapacitor, Changsoon Choi, Hyeon Jun Sim, Geoffrey M. Spinks, Xavier Lepró, Ray H. Baughman, Seon Jeong Kim

Faculty of Engineering and Information Sciences - Papers: Part A

Reversibly deformable and highly performing solid-state yarn supercapacitors are obtained using MnO2-deposited microcoiled yarn electrodes. The core(CNT)-shell(MnO2)-structured coiled electrodes achieve high stretchability (37.5%) without the help of elastomeric substrates, minimizing the size of the supercapacitors. Therefore, high specific capacitances of 34.6 F cm−3, 61.25 mF cm−2, and 2.72 mF cm−1 are achieved for coiled supercapacitors without impairing mechanical stretchability or electrochemical cyclability.


Effects Of Surface Roughness On Micro Deep Drawing Of Circular Cups With Consideration Of Size Effects, Liang Luo, Zhengyi Jiang, Dongbin Wei, Kenichi Manabe, Xianming Zhao, Di Wu, Tsuyoshi Furushima Jan 2016

Effects Of Surface Roughness On Micro Deep Drawing Of Circular Cups With Consideration Of Size Effects, Liang Luo, Zhengyi Jiang, Dongbin Wei, Kenichi Manabe, Xianming Zhao, Di Wu, Tsuyoshi Furushima

Faculty of Engineering and Information Sciences - Papers: Part A

Surface roughness, compared with tiny sizes of micro products, can be relatively large and has significant influences on micro forming processes and products' quality. In this study, a voronoi finite element model that considers size effects of material was developed. Next the surface roughness information was assigned to this voronoi model through different elemental thickness distributions. Furthermore, springback simulation was conducted for the micro deep drawn circular cups. Simulation results demonstrate that the surface roughness with consideration of size effects has significant influences on the overall springback, the drawability represented by the minimum thickness and products' quality regarding thickness evenness ...


Computational Fluid Dynamics Simulation Of Carbon Dioxide Dispersion In A Complex Environment, Bin Liu, Xiong Liu, Cheng Lu, Ajit R. Godbole, Guillaume Michal, A Kiet Tieu Jan 2016

Computational Fluid Dynamics Simulation Of Carbon Dioxide Dispersion In A Complex Environment, Bin Liu, Xiong Liu, Cheng Lu, Ajit R. Godbole, Guillaume Michal, A Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part A

In order to quantitatively evaluate the risk associated with the Carbon Capture and Storage (CCS) technology, a deeper understanding of CO2 dispersion resulting from accidental releases is essential. CO2 is a heavier-than-air gas. Its dispersion patterns may vary according to local conditions. This study focuses on CO2 dispersion over complex terrains. Computational Fluid Dynamics (CFD) models were developed to simulate the CO2 dispersion over two hypothetical topographies: (1) a flat terrain with an axisymmetric hill and (2) a simplified model of an urban area with buildings. The source strength, wind velocity and height of the buildings were varied to investigate ...


Tribological Behavior In Micro-Sheet Hydroforming, Hideki Sato, Kenichi Manabe, Dongbin Wei, Zhengyi Jiang, Sergei Alexandrov Jan 2016

Tribological Behavior In Micro-Sheet Hydroforming, Hideki Sato, Kenichi Manabe, Dongbin Wei, Zhengyi Jiang, Sergei Alexandrov

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, the tribological behavior and its size effects in micro-hydromechanical deep drawing (MHDD) are theoretically and experimentally investigated. It is found that a required fluid pressure for hydrodynamic lubrication significantly increases with scaling down micro-scale due to a high sealablity at small relative punch diameter to minimum thickness. Moreover, the opposite tribological size effect from a conventional microforming appears in MHDD in which the fluid medium can be kept in open lubricant pockets (OLPs) by applying a fluid pressure and, the friction coefficient decreases as a specimen size decreases. Thus, MHDD can induce the hydrodynamic lubrication and lubrication ...


Dynamic Response Of Symmetrical And Asymmetrical Sandwich Plates With Shear Thickening Fluid Core Subjected To Penetration Loading, Z. H. Tan, L Zuo, Weihua Li, L S. Liu, Peng Zhai Jan 2016

Dynamic Response Of Symmetrical And Asymmetrical Sandwich Plates With Shear Thickening Fluid Core Subjected To Penetration Loading, Z. H. Tan, L Zuo, Weihua Li, L S. Liu, Peng Zhai

Faculty of Engineering and Information Sciences - Papers: Part A

Symmetrical and asymmetrical sandwich plates with a shear thickening fluid (STF) core were designed to be penetrated by a cylindrical projectile at various impact velocities. These STFs consist of SiO2/PEG400, and the volume fractions of SiO2 nano-particles are 54% and 56%, respectively. Failure mode of the rear face sheet of the symmetrical sandwich plate is petal perforation, but the rear face sheet of the asymmetrical sandwich plate failed in plug perforation mode at the velocity of less than 80 m/s and in the petal perforation mode at the velocity faster than 90 m/s. The results showed that ...


Effect Of Sterilization Methods On Electrospun Poly(Lactic Acid) (Pla) Fiber Alignment For Biomedical Applications, T A. M Valente, D M. Silva, P S. Gomes, M H. Fernandes, J D. Santos, Vitor Sencadas Jan 2016

Effect Of Sterilization Methods On Electrospun Poly(Lactic Acid) (Pla) Fiber Alignment For Biomedical Applications, T A. M Valente, D M. Silva, P S. Gomes, M H. Fernandes, J D. Santos, Vitor Sencadas

Faculty of Engineering and Information Sciences - Papers: Part A

Medically approved sterility methods should be a major concern when developing a polymeric scaffold, mainly when commercialization is envisaged. In the present work, poly(lactic acid) (PLA) fiber membranes were processed by electrospinning with random and aligned fiber alignment and sterilized under UV, ethylene oxide (EO), and γ-radiation, the most common ones for clinical applications. It was observed that UV light and γ-radiation do not influence fiber morphology or alignment, while electrospun samples treated with EO lead to fiber orientation loss and morphology changing from cylindrical fibers to ribbon-like structures, accompanied to an increase of polymer crystallinity up to 28 ...


A Comparative Study Of Fluid Flow And Mass Transfer In A Trumpet-Shaped Ladle Shroud Using Large Eddy Simulation, Jiangshan Zhang, Jingshe Li, Yi Yan, Zhixin Chen, Shufeng Yang, Jingwei Zhao, Zhengyi Jiang Jan 2016

A Comparative Study Of Fluid Flow And Mass Transfer In A Trumpet-Shaped Ladle Shroud Using Large Eddy Simulation, Jiangshan Zhang, Jingshe Li, Yi Yan, Zhixin Chen, Shufeng Yang, Jingwei Zhao, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part A

The advantages of trumpet-shaped ladle shrouds (TLS) have been frequently demonstrated over conventional straight-bore ladle shrouds (CLS) with respect to production efficiency and molten steel quality in continuous casting practices. The present study is to shed some lights on why the TLS are better than the CLS design by examining the fluid dynamics and mass transfer using large eddy simulation. The obtained numerical results were validated with particle imaging velocimetry experiments. Flow velocity, deformation, turbulent energy dissipation, and mixing kinetics of tracer were discussed. The results showed that the entering jet of the CLS flowed straight down into the tundish ...


A Review Of Topologies Of Three-Port Dc-Dc Converters For The Integration Of Renewable Energy And Energy Storage System, Neng Zhang, Danny Sutanto, Kashem M. Muttaqi Jan 2016

A Review Of Topologies Of Three-Port Dc-Dc Converters For The Integration Of Renewable Energy And Energy Storage System, Neng Zhang, Danny Sutanto, Kashem M. Muttaqi

Faculty of Engineering and Information Sciences - Papers: Part A

The application of renewable energy such as solar photovoltaic (PV), wind and fuel cells is becoming increasingly popular because of the environmental awareness and advances in technology coupled with decreasing manufacturing cost. Power electronic converters are usually used to convert the power from the renewable sources to match the load demand and grid requirement to improve the dynamic and steady-state characteristics of these green generation systems, to provide the maximum power point tracking (MPPT) control, and to integrate the energy storage system to solve the challenge of the intermittent nature of the renewable energy and the unpredictability of the load ...


Optimizing Distributed Generation Parameters Through Economic Feasibility Assessment, Kashem M. Muttaqi, An D. T Le, Jamshid Aghaei, Esmaeil Mahboubi-Moghaddam, Michael Negnevitsky, Gerard Ledwich Jan 2016

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 ...


A Review Of Protection Systems For Distribution Networks Embedded With Renewable Generation, Joel Kennedy, Philip Ciufo, Ashish P. Agalgaonkar Jan 2016

A Review Of Protection Systems For Distribution Networks Embedded With Renewable Generation, Joel Kennedy, Philip Ciufo, Ashish P. Agalgaonkar

Faculty of Engineering and Information Sciences - Papers: Part A

The rapid growth of grid-connected embedded generation is changing the operational characteristics of power distribution networks. Amongst a range of issues being reported in the research, the effect of these changes on so-called 'traditional protection systems' has not gone without attention. Looking to the future, the possibility of microgrid systems and deliberate islanding of sections of the network will require highly flexible distribution management systems and a re-design of protection strategies. This paper explores the envisaged protection issues concerned with large penetrations of embedded generation in distribution networks extending into auto-reclosure and protection device coordination. A critical review of recently ...


Renewable Energy Management In A Remote Area Using Modified Gravitational Search Algorithm, Sahand Ghavidel, Jamshid Aghaei, Kashem M. Muttaqi, Alireza Heidari Jan 2016

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 Jan 2016

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 Jan 2016

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 ...


Application Of Advanced Bounding Surface Plasticity Model In Static And Seismic Analyses Of Zipingpu Dam, Mojtaba E. Kan, Hossein A. Taiebat Jan 2016

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 Jan 2016

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 ...


The Moderating Impact Of Temporal Separation On The Association Between Intention And Physical Activity: A Meta-Analysis, Mairtin S. Mcdermott, Rajeev Sharma, Megan Andrews, Shahriar Akter, Donald Iverson, Peter Caputi, Tim Coltman, Murad Safadi Jan 2016

The Moderating Impact Of Temporal Separation On The Association Between Intention And Physical Activity: A Meta-Analysis, Mairtin S. Mcdermott, Rajeev Sharma, Megan Andrews, Shahriar Akter, Donald Iverson, Peter Caputi, Tim Coltman, Murad Safadi

Faculty of Engineering and Information Sciences - Papers: Part A

Previous meta-analyses have estimated that the intention-behaviour association in physical activity (PA) is large in magnitude. However, these prior meta-analyses have also revealed a large degree of heterogeneity, suggesting the presence of moderating variables. This study examines the impact of one such moderator, testing the hypothesis that the magnitude of the association between intention and behaviour decreases as the temporal separation between the two increases. A systematic literature search was used to identify published and unpublished studies that met the inclusion criteria. A random-effects meta-regression was conducted to test the study hypothesis. A total of 78 journal articles and 11 ...


Efficient Dynamic Threshold Identity-Based Encryption With Constant-Size Ciphertext, Willy Susilo, Fuchun Guo, Yi Mu Jan 2016

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 ...


Nursing Staff Work Patterns In A Residential Aged Care Home: A Time-Motion Study, Siyu Qian, Ping Yu, David Hailey Jan 2016

Nursing Staff Work Patterns In A Residential Aged Care Home: A Time-Motion Study, Siyu Qian, Ping Yu, David Hailey

Faculty of Engineering and Information Sciences - Papers: Part A

Objective: Residential aged care services are challenged by an increasing number of residents and a shortage of nursing staff. Developing strategies to overcome this challenge requires an understanding of nursing staff work patterns. The aim of the present study was to investigate the work processes followed by nursing staff and how nursing time is allocated in a residential aged care home.

Methods: An observational time-motion study was conducted at two aged care units for 12 morning shifts. Seven nurses were observed, one per shift.

Results: In all, there were 91 h of observation. The results showed that there was a ...


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 Jan 2016

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 ...


Synthesis Of Sic Whiskers By Vls And Vs Process, Xiang Li, Guangqing Zhang, Ragnar Tronstad, Oleg Ostrovski Jan 2016

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 ...


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 Jan 2016

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 ...


Bottom-Up Microfabrication Process For Individually Controlled Conjugated Polymer Actuators, Alexandre Khaldi, Ali Maziz, Gursel Alici, Geoffrey M. Spinks, Edwin W. Jager Jan 2016

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 ...


Mechanical Properties And Tribological Behavior Of Aluminum Matrix Composites Reinforced With In-Situ Alb2 Particles, Linlin Yuan, Jingtao Han, Jing Liu, Zhengyi Jiang Jan 2016

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.


Mechanical Fatigue Performance Of Pcl-Chondroprogenitor Constructs After Cell Culture Under Bioreactor Mechanical Stimulus, J A. Panadero, Vitor Sencadas, Sonia C.M. Silva, Clarisse Ribeiro, Vítor Correia, F M. Gama, J L. Gomez Ribelles, Senentxu Lanceros-Méndez Jan 2016

Mechanical Fatigue Performance Of Pcl-Chondroprogenitor Constructs After Cell Culture Under Bioreactor Mechanical Stimulus, J A. Panadero, Vitor Sencadas, Sonia C.M. Silva, Clarisse Ribeiro, Vítor Correia, F M. Gama, J L. Gomez Ribelles, Senentxu Lanceros-Méndez

Faculty of Engineering and Information Sciences - Papers: Part A

In tissue engineering of cartilage, polymeric scaffolds are implanted in the damaged tissue and subjected to repeated compression loading cycles. The possibility of failure due to mechanical fatigue has not been properly addressed in these scaffolds. Nevertheless, the macroporous scaffold is susceptible to failure after repeated loading- unloading cycles. This is related to inherent discontinuities in the material due to the micropore structure of the macropore walls that act as stress concentration points. In this work, chondrogenic precursor cells have been seeded in poly-e-caprolactone (PCL) scaffolds with fibrin and some were submitted to free swelling culture and others to cyclic ...


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 Jan 2016

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 ...