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Articles 811 - 840 of 2936
Full-Text Articles in Social and Behavioral Sciences
Calibrating Markov Chain-Based Deterioration Models For Predicting Future Conditions Of Railway Bridge Elements, Niroshan Walgama Wellalage, Tieling Zhang, Richard Dwight
Calibrating Markov Chain-Based Deterioration Models For Predicting Future Conditions Of Railway Bridge Elements, Niroshan Walgama Wellalage, Tieling Zhang, Richard Dwight
Faculty of Engineering and Information Sciences - Papers: Part A
Existing nonlinear optimization-based algorithms for estimating Markov transition probability matrix (TPM) in bridge deterioration modeling sometimes fail to find optimum TPM values, and hence lead to invalid future condition prediction. In this study, a Metropolis-Hasting algorithm (MHA)-based Markov chain Monte Carlo (MCMC) simulation technique is proposed to overcome this limitation and calibrate the state-based Markov deterioration models (SBMDM) of railway bridge components. Factors contributing to rail bridge deterioration were identified; inspection data for 1,000 Australian railway bridges over 15 years were reviewed and filtered. The TPMs corresponding to a typical bridge element were estimated using the proposed MCMC simulation method …
Energy Loss At Bends In The Pneumatic Conveying Of Fly Ash, Naveen Tripathi, A Sharma, Soumya Suddha Mallick, Peter W. Wypych
Energy Loss At Bends In The Pneumatic Conveying Of Fly Ash, Naveen Tripathi, A Sharma, Soumya Suddha Mallick, Peter W. Wypych
Faculty of Engineering and Information Sciences - Papers: Part A
An accurate estimation of the total pressure drop of a pipeline is important to the reliable design of a pneumatic conveying system. The present paper presents results from an investigation into the modelling of the pressure drop at a bend in the pneumatic conveying of fly ash. Seven existing bend models were used (in conjunction with solids friction models for horizontal and vertical straight pipes, and initial acceleration losses) to predict the total pipeline pressure drop in conveying fly ash (median particle diameter: 30μm; particle density: 2300kg/m3; loose-poured bulk density: 700kg/m3) in three test rigs (pipelines …
Investigation Of X70 Line Pipe Steel Fracture During Single Edge-Notched Tensile Testing Using Acoustic Emission Monitoring, Turbadrakh Chuluunbat, Cheng Lu, Andrii Kostryzhev, A Kiet Tieu
Investigation Of X70 Line Pipe Steel Fracture During Single Edge-Notched Tensile Testing Using Acoustic Emission Monitoring, Turbadrakh Chuluunbat, Cheng Lu, Andrii Kostryzhev, A Kiet Tieu
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents an investigation of the fracture behavior of X70 pipeline steel using the acoustic emission (AE) monitoring technique. The AE monitoring technique is widely used in mechanical and materials research for detection of plastic deformation, fracture initiation and crack growth. However, quantitative dependences of the AE parameters (such as signal amplitude and frequency) on the fracture parameters of X70 pipeline steel (such as ductile and brittle fracture initiation and propagation) have not been studied in depth and are therefore not completely understood. In this paper, we report an investigation of the effect of loading conditions on the fracture …
File Sharing In Cloud Computing Using Win Stay Lose Shift Strategy, Yilei Wang, Willy Susilo, Tao Li, Qiuliang Xu
File Sharing In Cloud Computing Using Win Stay Lose Shift Strategy, Yilei Wang, Willy Susilo, Tao Li, Qiuliang Xu
Faculty of Engineering and Information Sciences - Papers: Part A
Traditionally, users in clouds are assumed to be willing to store and share files in clouds, where the security and efficiency issues are discussed. However, few studies involve the incentives to share files in clouds. In this paper, we delve into users' incentives for using the cloud system to store and share their files towards the view of game theory. More specifically, the process of file sharing is reduced to an infinitely repeated prisoner's dilemma PD game and the action of sharing files in clouds is considered as the action of cooperation in the infinitely repeated PD game. We incorporate …
An Effective Asexual Genetic Algorithm For Solving The Job Shop Scheduling Problem, Mehrdad Amirghasemi, Reza R. Zamani
An Effective Asexual Genetic Algorithm For Solving The Job Shop Scheduling Problem, Mehrdad Amirghasemi, Reza R. Zamani
Faculty of Engineering and Information Sciences - Papers: Part A
All rights reserved. Abstract By using the notion of elite pool, this paper presents an effective asexual genetic algorithm for solving the job shop scheduling problem. Based on mutation operations, the algorithm selectively picks the solution with the highest quality from the pool and after its modification, it can replace the solution with the lowest quality with such a modified solution. The elite pool is initially filled with a number of non-delay schedules, and then, in each iteration, the best solution of the elite pool is removed and mutated in a biased fashion through running a limited tabu search procedure. …
A Multi-Agent Framework For Packet Routing In Wireless Sensor Networks, Dayong Ye, Minjie Zhang, Yun Yang
A Multi-Agent Framework For Packet Routing In Wireless Sensor Networks, Dayong Ye, Minjie Zhang, Yun Yang
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Tactile Sensing System Using Electro-Tactile Feedback, Daniel Pamungkas, Koren Ward
Tactile Sensing System Using Electro-Tactile Feedback, Daniel Pamungkas, Koren Ward
Faculty of Engineering and Information Sciences - Papers: Part A
2015 IEEE. Tactile or touch sensing can enable an object's surface texture and other properties to be perceived which can facilitate grasping and manipulating various objects. Prosthetic hand users and operators of tele-operated robot arms also need to perceive these tactile properties by some means to effectively manipulate objects and performed skilled work. This paper introduces a tactile sensing and feedback system that is based on detecting surface vibrations in an artificial finger, when contact or friction with a surface is made, and appropriately stimulating nerves in the user's skin with electro-tactile feedback. This feedback system has benefits over existing …
Immersive Teleoperation Of A Robot Arm Using Electro-Tactile Feedback, Daniel Pamungkas, Koren Ward
Immersive Teleoperation Of A Robot Arm Using Electro-Tactile Feedback, Daniel Pamungkas, Koren Ward
Faculty of Engineering and Information Sciences - Papers: Part A
2015 IEEE. Teleoperation can allow an operator to control a robot remotely in inaccessible and hostile places. To achieve more dexterous control of a tele-operated robot some researchers are developing user interfaces equipped with vision and tactile feedback. 3D visual perception and tactile feedback can also assist the operator to feel immersed in the robot's environment and embodied within the robot to some extent. Most existing tactile feedback systems use electro-mechanical actuators and linkages. However, these systems are complex, cumbersome and consequently make it difficult for the operator feel embodied within the robot. To improve on these drawbacks, this paper …
Enhancing Teamwork Performance In Mobile Cloud-Based Learning, Geng Sun, Jun Shen
Enhancing Teamwork Performance In Mobile Cloud-Based Learning, Geng Sun, Jun Shen
Faculty of Engineering and Information Sciences - Papers: Part A
Mobile cloud-based learning is a novel trend that allows collaborative learning to happen among distributed learners, but it still lacks of mechanisms to enhance teamwork performance. Combining the features of the cloud, we have identified a learning flow based on Kolb team learning experience, executed by cloud-hosting learning management systems in conjunction with our newly designed system, 'Teamwork as a Service (TaaS)'. Each of TaaS's five web services aims to organize a certain type of learning activities, providing learners with an introduction, a 'jigsaw classroom', schedule planning, and mutual supervision during the whole collaborative learning process. In particular, enabling a …
Shear Behaviour Of A Lignosulfonate Treated Silty Sand, Buddhima Indraratna, Rasika Athukorala, Jayan S. Vinod
Shear Behaviour Of A Lignosulfonate Treated Silty Sand, Buddhima Indraratna, Rasika Athukorala, Jayan S. Vinod
Faculty of Engineering and Information Sciences - Papers: Part A
Chemical treatment is a widely accepted cost effective ground improvement technique for stabilising problematic soils. However, the traditional soil stabilisers (e.g. cement and lime) are not always readily acceptable in Australia due to stringent occupational health and safety issues. They have been identified to cause serious environmental problems by altering the pH of soil and groundwater upon treatment. Moreover, excessive use of traditional admixtures to stabilize soil would also affect the yielding capacity of soils. To overcome these consequences, an alternative soil stabiliser that improves the properties of soil without causing adverse effect on the environment must be found. In …
Reducing The Risk Of Acidic Groundwater Through Modelling The Performance Of A Permeable Reactive Barrier In Shoalhaven Floodplain, U Pathirage, B Indraratna
Reducing The Risk Of Acidic Groundwater Through Modelling The Performance Of A Permeable Reactive Barrier In Shoalhaven Floodplain, U Pathirage, B Indraratna
Faculty of Engineering and Information Sciences - Papers: Part A
Acidic groundwater generated from acid sulfate soil (ASS) usually carries high concentrations of aluminium (Al) and iron (Fe), which create unfavourable conditions to living habitat. ASS research team at the University of Wollongong, Australia implemented an innovative geotechnical engineering technique for the remediation of acidic groundwater through a permeable reactive barrier (PRB) using recycled concrete aggregates as the reactive material. This PRB was installed at the Shoalhaven Floodplain, southeast New South Wales (NSW), Australia in October 2006 and has proved effective in neutralisation of groundwater by increasing the pH from 3.6 to 7 and removing 99% of Al and Fe …
Effect Of Suction History On The Small Strain Response Of A Dynamically Compacted Soil, Ana Heitor, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Effect Of Suction History On The Small Strain Response Of A Dynamically Compacted Soil, Ana Heitor, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part A
The small strain behaviour is a key indicator for assessing the performance of compacted fills. Compaction conditions i.e. initial moisture content and applied energy, govern compaction effectiveness and, thus, the structure and matric suction of compacted soil. During their service life, most earth structures experience changes in hydraulic behaviour owing to climatic changes. While the results of previous research studies indicate that the effect of changes in suction on the dynamic response is significant, only limited research has been engaged in the assessment of the effect of post-compacted changes in suction induced by periods of intensive precipitation (i.e. wetting) and …
A New Model For Describing The Behaviour Of Soft Soils Under Cyclic Loading, B Indraratna, J Ni, C Rujikiatkamjorn, R Zhong
A New Model For Describing The Behaviour Of Soft Soils Under Cyclic Loading, B Indraratna, J Ni, C Rujikiatkamjorn, R Zhong
Faculty of Engineering and Information Sciences - Papers: Part A
Cyclic loading induced foundation instabilities such as the loss of bearing capacity and excessive plastic deformation of the subgrade are among the major concerns for the design and construction of transport infrastructure. There are limited studies on the modelling of cyclic loading of soft soils due to its complexities compared to static loading. In this study, a new constitutive model for soft clays under undrained cyclic triaxial loading has been developed based on the Modified Cam-clay theory. A new yield surface for elastic unloading was introduced by adopting two additional cyclic degradation parameters, which govern the change of the yield …
Alternative Design Approach For Soft Clay Improved By Pvds, Cholachat Rujikiatkamjorn, Buddhima Indraratna, Darshana Perera
Alternative Design Approach For Soft Clay Improved By Pvds, Cholachat Rujikiatkamjorn, Buddhima Indraratna, Darshana Perera
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper the design procedures for multi-stage construction based on the research know-how described by Rujikiatkamjorn and Indraratna (2009) are proposed. The length of a vertical drain, anisotropic soil permeability, and vacuum pressure are considered and a reduction in consolidation time through vacuum preloading is compared to other available methods. Design charts eliminating cumbersome iterative procedures are then developed using the equivalent drain diameter as an independent variable, to obtain the relevant drain spacing. The design examples based on the land reclamation project at the Port of Brisbane for both single and multi-stage construction are also given.
Effects Of Iron Salt Addition On Biosolids Reduction By Oxic-Settling-Anoxic (Osa) Process, Galilee U. Semblante, Faisal I. Hai, Heriberto Bustamante, Nelly Guevara, William E. Price, Long D. Nghiem
Effects Of Iron Salt Addition On Biosolids Reduction By Oxic-Settling-Anoxic (Osa) Process, Galilee U. Semblante, Faisal I. Hai, Heriberto Bustamante, Nelly Guevara, William E. Price, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
The oxic-settling anoxic (OSA) process interchanges activated sludge between alternating redox conditions (e.g., aerobic and anoxic) to reduce biosolids production. Iron salts addition to wastewater is performed to remove phosphorous, but this study demonstrated that it may impair OSA performance. Batch test results showed that the addition of iron salt (as Fe2+) decreased the volatile solids reduction of an intermittently aerated batch reactor (i.e., aerobic/anoxic), probably because iron reduced the destruction of extracellular polymeric substances (EPS) that serve as the structural framework of sludge flocs. The effect of different FeCl2 dosages (0, 15, and 30 mg l−1) on the sludge …
A Novel Approach To Postmastectomy Radiation Therapy Using Scanned Proton Beams, Nicolas Depauw, Estelle Batin, Julianne Daartz, Anatoly Rosenfeld, Judith Adams, Hanne Kooy, Shannon Macdonald, Hsiao-Ming Lu
A Novel Approach To Postmastectomy Radiation Therapy Using Scanned Proton Beams, Nicolas Depauw, Estelle Batin, Julianne Daartz, Anatoly Rosenfeld, Judith Adams, Hanne Kooy, Shannon Macdonald, Hsiao-Ming Lu
Faculty of Engineering and Information Sciences - Papers: Part A
Purpose: Postmastectomy radiation therapy (PMRT), currently offered at Massachusetts General Hospital, uses proton pencil beam scanning (PBS) with intensity modulation, achieving complete target coverage of the chest wall and all nodal regions and reduced dose to the cardiac structures. This work presents the current methodology for such treatment and the ongoing effort for its improvements. Methods and Materials: A single PBS field is optimized to ensure appropriate target coverage and heart/lung sparing, using an in-house-developed proton planning system with the capability of multicriteria optimization. The dose to the chest wall skin is controlled as a separate objective in the optimization. …
Real-Time Eye Lens Dose Monitoring During Cerebral Angiography Procedures, M J. Safari, J H.D. Wong, K A.A. Kadir, N K. Thorpe, D L. Cutajar, M Petasecca, M L. F Lerch, A B. Rosenfeld, K. H. Ng
Real-Time Eye Lens Dose Monitoring During Cerebral Angiography Procedures, M J. Safari, J H.D. Wong, K A.A. Kadir, N K. Thorpe, D L. Cutajar, M Petasecca, M L. F Lerch, A B. Rosenfeld, K. H. Ng
Faculty of Engineering and Information Sciences - Papers: Part A
Objectives: To develop a real-time dose-monitoring system to measure the patient’s eye lens dose during neuro-interventional procedures. Methods: Radiation dose received at left outer canthus (LOC) and left eyelid (LE) were measured using Metal-Oxide-Semiconductor Field-Effect Transistor dosimeters on 35 pa- tients who underwent diagnostic or cerebral embolization procedures. Results: The radiation dose received at the LOC region was significantly higher than the dose received by the LE. The maximum eye lens dose of 1492 mGy was measured at LOC region for an AVM case, followed by 907 mGy for an aneurysm case and 665 mGy for a diagnostic angiography procedure. …
Nonlinear Optical Conductivity Of Bilayer Graphene With Rashba Spin-Orbit Interaction In The Terahertz Regime, Zheng Liu, Matthew Sanderson, Chao Zhang, J C. Cao
Nonlinear Optical Conductivity Of Bilayer Graphene With Rashba Spin-Orbit Interaction In The Terahertz Regime, Zheng Liu, Matthew Sanderson, Chao Zhang, J C. Cao
Faculty of Engineering and Information Sciences - Papers: Part A
The effect of Rashba spin-orbit coupling on the nonlinear optical conductivity in a bilayer graphene is investigated. We demonstrate the very different role played by the Rashba term and interlayer hopping; in some cases, the two roles can be quite opposite. It is found that the Rashba term can either enhance or suppress the nonlinear effect in a bilayer graphene, depending on the strength of the interlayer hopping. For a weak interlayer hopping, the Rashba term can significantly enhance the nonlinear effect. An analytical result was derived, showing the interplay of the Rashba effect and the interlayer hopping effect.
Optimising Thermal Efficiency Of Direct Contact Membrane Distillation By Brine Recycling For Small-Scale Seawater Desalination, Hung C. Duong, Paul Cooper, Bart Nelemans, Tzahi Y. Cath, Long D. Nghiem
Optimising Thermal Efficiency Of Direct Contact Membrane Distillation By Brine Recycling For Small-Scale Seawater Desalination, Hung C. Duong, Paul Cooper, Bart Nelemans, Tzahi Y. Cath, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
A technique to optimise thermal efficiency using brine recycling during direct contact membrane distillation (DCMD) of seawater was investigated. By returning the hot brine to the feed tank, the system water recovery could be increased and the sensible heat of the hot brine was recovered to improve thermal efficiency. The results show that in the optimal water recovery range of 20 to 60% facilitated by brine recycling, the specific thermal energy consumption of the process could be reduced by more than half. It is also noteworthy that within this optimal water recovery range, the risk of membrane scaling is negligible …
Soft, Flexible Micromanipulators Comprising Polypyrrole Trilayer Microactuators, Alexandre Khaldi, Ali Maziz, Gursel Alici, Geoffrey M. Spinks, Edwin W. Jager
Soft, Flexible Micromanipulators Comprising Polypyrrole Trilayer Microactuators, Alexandre Khaldi, Ali Maziz, Gursel Alici, Geoffrey M. Spinks, Edwin W. Jager
Faculty of Engineering and Information Sciences - Papers: Part A
Within the areas of cell biology, biomedicine and minimal invasive surgery, there is a need for soft, flexible and dextrous biocompatible manipulators for handling biological objects, such as single cells and tissues. Present day technologies are based on simple suction using micropipettes for grasping objects. The micropipettes lack the possibility of accurate force control, nor are they soft and compliant and may thus cause damage to the cells or tissue. Other micromanipulators use conventional electric motors however the further miniaturization of electrical motors and their associated gear boxes and/or push/pull wires has reached its limits. Therefore there is an urgent …
A Laboratory Study On The Shear Behavior Of Mixtures Of Coal Wash And Steel Furnace Slag As Potential Structural Fill, Seyed M.A Tasalloti, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Ana Heitor, Gabriele Chiaro
A Laboratory Study On The Shear Behavior Of Mixtures Of Coal Wash And Steel Furnace Slag As Potential Structural Fill, Seyed M.A Tasalloti, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Ana Heitor, Gabriele Chiaro
Faculty of Engineering and Information Sciences - Papers: Part A
The accumulation of industrial waste materials (e.g., coal wash and steel furnace slag) has become a critical environmental problem in Australia in recent years. The possible re-use of these types of materials as structural fill for transport embankments and land reclamation is one of the preferred options from a waste management perspective. Consequently, an experimental testing program was undertaken using the triaxial apparatus to evaluate the shear behavior of compacted mixtures of coal wash (CW) and steel furnace slag (SFS). The effect of varying the confining pressure and the percentage of coal wash on the isotropic compression line, the stress-strain …
Scaling Control During Membrane Distillation Of Coal Seam Gas Reverse Osmosis Brine, Hung C. Duong, Stephen Gray, Mikel Duke, Tzahi Y. Cath, Long D. Nghiem
Scaling Control During Membrane Distillation Of Coal Seam Gas Reverse Osmosis Brine, Hung C. Duong, Stephen Gray, Mikel Duke, Tzahi Y. Cath, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
We systematically assess the efficiency of chemical cleaning and report a simple but elegant approach to control scaling during membrane distillation (MD) of brine from reverse osmosis (RO) treatment of coal seam gas (CSG) produced water. Results reported here show that increased feed water salinity and the permeation of CO2 from the feed solution resulted in only a small and gradual decrease in water flux. On the other hand, the precipitation of sparingly soluble salts on the membrane at high water recovery (>70%) led to a significant flux decline. Among the three chemical cleaning agents investigated, a reverse osmosis …
The Role Of Compaction Energy On The Small Strain Properties Of A Compacted Silty Sand Subjected To Drying - Wetting Cycles, A Heitor, B Indraratna, C Rujikiatkamjorn
The Role Of Compaction Energy On The Small Strain Properties Of A Compacted Silty Sand Subjected To Drying - Wetting Cycles, A Heitor, B Indraratna, C Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part A
The elastic properties of a soil are usually investigated to describe its engineering behaviour. The results of previous studies indicate that the effect of changes in suction on the elastic response at a small strain level of soils is significant during compaction and post-compaction periods. Limited efforts have been focused on quantifying those post-compacted responses due to the changes in suction induced by wetting and drying cycles. During their service life, most earth structures experience changes in hydraulic behaviour owing to climatic changes. These seasonal fluctuations in turn impact on the geomechanical performance of compacted soil. In this paper the …
Searchable Atribute-Based Mechanism With Efficiient Data Sharing For Secure Cloud Storage, Kaitai Liang, Willy Susilo
Searchable Atribute-Based Mechanism With Efficiient Data Sharing For Secure Cloud Storage, Kaitai Liang, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
To date, the growth of electronic personal data leads to a trend that data owners prefer to remotely outsource their data to clouds for the enjoyment of the high-quality retrieval and storage service without worrying the burden of local data management and maintenance. However, secure share and search for the outsourced data is a formidable task, which may easily incur the leakage of sensitive personal information. Efficient data sharing and searching with security is of critical importance. This paper, for the first time, proposes a searchable attribute-based proxy re-encryption system. When compared to existing systems only supporting either searchable attribute-based …
Boundary C^{2,\Alpha} Estimates For Monge-Ampere Type Equations, Yong Huang, Feida Jiang, Jiakun Liu
Boundary C^{2,\Alpha} Estimates For Monge-Ampere Type Equations, Yong Huang, Feida Jiang, Jiakun Liu
Faculty of Engineering and Information Sciences - Papers: Part A
In this paper, we obtain global second derivative estimates for solutions of the Dirichlet problem of certain Monge-Ampère type equations under some structural conditions, while the inhomogeneous term is only assumed to be Hölder continuous and bounded away from zero and infinity. These estimates correspond to those for the standard Monge-Ampère equation obtained by Trudinger and Wang (2008) and by Savin (2013), and have natural applications in optimal transportation and prescribed Jacobian equations.
Figures Of Merit For Simultaneous Inference And Comparisons In Simulation Experiments, Noel A. Cressie, Sandy Burden
Figures Of Merit For Simultaneous Inference And Comparisons In Simulation Experiments, Noel A. Cressie, Sandy Burden
Faculty of Engineering and Information Sciences - Papers: Part A
2015 John Wiley & Sons, Ltd. This article considers the traditional figures of merit, namely, bias and mean squared (prediction) error, which are typically used to evaluate simulation experiments. We propose functions of them that account for different variables' units; these alternative figures of merit are closely tied to simultaneous multivariate inference on an unknown parameter vector or unknown state vector. Their usefulness is illustrated in a simulation experiment, where the goal is to determine the statistical properties associated with prediction of a multivariate state.
In Situ Observation Of Acicular Ferrite Formation Using Ht-Lscm: Possibilities, Challenges And Influencing Factors, Denise Loder, Susanne K. Michelic, A Mayerhofer, Christian Bernhard, Rian J. Dippenaar
In Situ Observation Of Acicular Ferrite Formation Using Ht-Lscm: Possibilities, Challenges And Influencing Factors, Denise Loder, Susanne K. Michelic, A Mayerhofer, Christian Bernhard, Rian J. Dippenaar
Faculty of Engineering and Information Sciences - Papers: Part A
By using a Laser Scanning Confocal Microscope combined with a High Temperature Furnace (HT-LSCM) for the in situ investigation of acicular ferrite (AF) formation in HSLA steels, new information about the mechanism of formation of this high toughness phase can be gained. Due to the utilization of an inert furnace atmosphere, the ability to accurately adjustment the austenitizing temperature and the well-controllable cooling conditions, the interactions between steel composition, austenite grain size, cooling rate and the fraction of AF formed have been analyzed in detail. The present work focuses on necessary adaptions and appropriate settings of the HT-LSCM for the …
Effects Of Grain Boundaries In Oxide Scale On Tribological Properties Of Nanoparticles Lubrication, Xianglong Yu, Zhengyi Jiang, Jingwei Zhao, Dongbin Wei, Cunlong Zhou, Qingxue Huang
Effects Of Grain Boundaries In Oxide Scale On Tribological Properties Of Nanoparticles Lubrication, Xianglong Yu, Zhengyi Jiang, Jingwei Zhao, Dongbin Wei, Cunlong Zhou, Qingxue Huang
Faculty of Engineering and Information Sciences - Papers: Part A
The characters of grain boundaries in oxide layers formed on substrates influence adhesion and friction behaviour, surface fracture and wear during high temperature steel processing. In this work, an electron backscattered diffraction (EBSD) analysis was conducted to investigate the role of surface grain boundary and orientation in magnetite (Fe3O4)/haematite (α-Fe2O3) scale during hot rolling, and further evaluate their effects on tribological properties of water-based nanoparticles lubrication. The results demonstrate that Fe3O4 (100) plane is strongly sensitive to the surface characteristics as the minimisation of surface energy. Coincident site lattice …
In Situ Powder Diffraction Studies Of Electrode Materials In Rechargeable Batteries, Neeraj Sharma, Wei Kong Pang, Zaiping Guo, Vanessa K. Peterson
In Situ Powder Diffraction Studies Of Electrode Materials In Rechargeable Batteries, Neeraj Sharma, Wei Kong Pang, Zaiping Guo, Vanessa K. Peterson
Faculty of Engineering and Information Sciences - Papers: Part A
The ability to directly track the charge carrier in a battery as it inserts/extracts from an electrode during charge/discharge provides unparalleled insight for researchers into the working mechanism of the device. This crystallographic-electrochemical information can be used to design new materials or modify electrochemical conditions to improve battery performance characteristics, such as lifetime. Critical to collecting operando data used to obtain such information insitu while a battery functions are X-ray and neutron diffractometers with sufficient spatial and temporal resolution to capture complex and subtle structural changes. The number of operando battery experiments has dramatically increased in recent years, particularly those …
Experimental And Numerical Study Of Micro Deep Drawing, Liang Luo, Zhengyi Jiang, Dongbin Wei, Kenichi Manabe, Hideki Sato
Experimental And Numerical Study Of Micro Deep Drawing, Liang Luo, Zhengyi Jiang, Dongbin Wei, Kenichi Manabe, Hideki Sato
Faculty of Engineering and Information Sciences - Papers: Part A
Micro forming is a key technology for an industrial miniaturisation trend, and micro deep drawing (MDD) is a typical micro forming method. It has great advantages comparing to other micro manufacturing methods, such as net forming ability, mass production potential, high product quality and complex 3D metal products fabrication capacity. Meanwhile, it is facing difficulties, for example the so-called size effects, once scaled down to micro scale. To investigate and to solve the problems in MDD, a combined micro blanking-drawing machine is employed and an explicit-implicit micro deep drawing model with a voronoi blank model is developed. Through heat treatment …