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Articles 3241 - 3270 of 14367

Full-Text Articles in Social and Behavioral Sciences

Pore Pressure Based Method To Quantify Smear Around A Vertical Drain, Kirti Choudhary, Buddhima Indraratna, Cholachat Rujikiatkamjorn Jan 2016

Pore Pressure Based Method To Quantify Smear Around A Vertical Drain, Kirti Choudhary, Buddhima Indraratna, Cholachat Rujikiatkamjorn

Faculty of Engineering and Information Sciences - Papers: Part A

Radial consolidation testing of Ballina clay (New South Wales, Australia) was carried out using a large-scale consolidometer 650 mm in diameter. In this study, the characteristics of the smear zone were evaluated on the basis of hydraulic gradient changes derived from the measured excess pore pressure data in the radial direction. The extent of the smear zone determined using this technique is compared with past approaches, where the variations in water content and lateral permeability were adopted to evaluate smear. The approach proposed herein based on the change of hydraulic gradient coincides with the previous two methods, and the smear …

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Orthogonal Polynomial-Based Nonlinearity Modeling And Mitigation For Led Communications, Weikang Zhao, Qinghua Guo, Jun Tong, Jiangtao Xi, Yanguang Yu, Pingjuan Niu, Xiaohong Sun Jan 2016

Orthogonal Polynomial-Based Nonlinearity Modeling And Mitigation For Led Communications, Weikang Zhao, Qinghua Guo, Jun Tong, Jiangtao Xi, Yanguang Yu, Pingjuan Niu, Xiaohong Sun

Faculty of Engineering and Information Sciences - Papers: Part A

The light-emitting diode (LED) is the major source of nonlinearity in LED communications, and the nonlinearity needs to be effectively modeled and thereby mitigated through predistortion or postdistortion to avoid degradation of communication performance. A memory polynomial is often used for LED nonlinearity modeling and mitigation in the literature. However, the estimation of memory polynomial coefficients suffers from numerical instability, resulting in inaccurate modeling and poor performance in nonlinearity mitigation. In this paper, we propose an orthogonal polynomial-based nonlinearity modeling and mitigation technique for LED communications with pulse amplitude modulation (PAM) signaling and show that the proposed technique significantly outperforms …

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Iterates Of Holomorphic Self-Maps On Pseudoconvex Domains Of Finite And Infinite Type In Cn, Tran Vu Khanh, Ninh Van Thu Jan 2016

Iterates Of Holomorphic Self-Maps On Pseudoconvex Domains Of Finite And Infinite Type In Cn, Tran Vu Khanh, Ninh Van Thu

Faculty of Engineering and Information Sciences - Papers: Part A

Using the lower bounds on the Kobayashi metric established by the first author, we prove a Wolff-Denjoy-type theorem for a very large class of pseudoconvex domains in Cn. This class includes many pseudoconvex domains of finite type and infinite type.

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Soft Soil Stabilisation Through Native Vegetation Along Rail Corridors, Udeshini Pathirage, Buddhima Indraratna, Ana Heitor Jan 2016

Soft Soil Stabilisation Through Native Vegetation Along Rail Corridors, Udeshini Pathirage, Buddhima Indraratna, Ana Heitor

Faculty of Engineering and Information Sciences - Papers: Part A

The 'green corridor' concept along the railway lines is an emerging research area in bio-engineering as form of subgrade soil stabilization. Native trees grown along rail corridors increase the matric suction of the subgrade through the root water uptake associated with the evapo-transpiration by the tree canopy. One of the most important aspects in subsoil improvement through native vegetation is the effect of osmotic suction attributed to solute uptake by active root hairs. The current study offers to capture the effect of matric and osmotic suction to overcome the existing empirical relations which are applicable mainly for site-specific controlled conditions. …

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General Purpose Cement With Increased Limestone Content In Australia, Iman Mohammadi, Warren J. South Jan 2016

General Purpose Cement With Increased Limestone Content In Australia, Iman Mohammadi, Warren J. South

Faculty of Engineering and Information Sciences - Papers: Part A

This paper discusses the effects of an increase in the maximum allowable limestone content of general purpose (GP) cement from 7.5 up to 12%. The substitution of a higher content of clinker with limestone will allow for a lower embodied energy and emissions associated with the manufacture of GP cement. Fresh and hardened properties of normal-grade concrete (N20 and N32) prepared with GP cement containing limestone contents in the range of 5 to 12% were investigated. The compliance of test results were checked and confirmed against the requirements of cement and concrete specifications. In addition, the test results were statistically …

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Edit Distance Based Encryption And Its Application, Phuong Viet Xuan Tran, Guomin Yang, Willy Susilo, Kaitai Liang Jan 2016

Edit Distance Based Encryption And Its Application, Phuong Viet Xuan Tran, Guomin Yang, Willy Susilo, Kaitai Liang

Faculty of Engineering and Information Sciences - Papers: Part A

Edit distance, also known as Levenshtein distance, is a very useful tool to measure the similarity between two strings. It has been widely used in many applications such as natural language processing and bioinformatics. In this paper, we introduce a new type of fuzzy public key encryption called Edit Distance-based Encryption (EDE). In EDE, the encryptor can specify an alphabet string and a threshold when encrypting a message, and a decryptor can obtain a decryption key generated from another alphabet string, and the decryption will be successful if and only if the edit distance between the two strings is within …

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Contraction Of Convex Surfaces By Nonsmooth Functions Of Curvature, Ben H. Andrews, James A. Mccoy Jan 2016

Contraction Of Convex Surfaces By Nonsmooth Functions Of Curvature, Ben H. Andrews, James A. Mccoy

Faculty of Engineering and Information Sciences - Papers: Part A

We consider the motion of convex surfaces with normal speed given by arbitrary strictly monotone, homogeneous degree one functions of the principal curvatures (with no further smoothness assumptions). We prove that such processes deform arbitrary uniformly convex initial surfaces to points in finite time, with spherical limiting shape. This result was known previously only for smooth speeds. The crucial new ingredient in the argument, used to prove convergence of the rescaled surfaces to a sphere without requiring smoothness of the speed, is a surprising hidden divergence form structure in the evolution of certain curvature quantities.

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Cloud Computing Services Adoption In Australian Smes: A Firm-Level Investigation, Salim Al Isma'ili, Mengxiang Li, Qiang He, Jun Shen Jan 2016

Cloud Computing Services Adoption In Australian Smes: A Firm-Level Investigation, Salim Al Isma'ili, Mengxiang Li, Qiang He, Jun Shen

Faculty of Engineering and Information Sciences - Papers: Part A

Cloud computing services can boost the competitiveness of Small and Medium-sized Enterprises (SMEs) and leverage countries' economies. In the Australian context, there is an emerging trend that SMEs begin to embrace cloud technology in their traditional business activities. However, prior studies did not pay much attention to investigating the factors that influence the cloud computing adoption among Australian SMEs. To fill the research gap, this paper investigates the influential factors that affect the decision on adopting cloud computing services for Australian SMEs. Protocol data collected from fifteen firm-level semi-structured interviews with practitioners are presented and discussed. The protocol analysis indicates …

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Cloud Computing Adoption Determinants: An Analysis Of Australian Smes, Salim Al Isma'ili, Mengxiang Li, Jun Shen, Qiang He Jan 2016

Cloud Computing Adoption Determinants: An Analysis Of Australian Smes, Salim Al Isma'ili, Mengxiang Li, Jun Shen, Qiang He

Faculty of Engineering and Information Sciences - Papers: Part A

In Australia, there is an emerging tendency among SMEs towards the adoption of cloud computing. However, there are limited studies investigating the factors that influence cloud computing adoption within Australian SMEs. To fill the research vacuum, we developed a research model based on the diffusion of innovation theory (DOI), the technology-organisation-environment (TOE) framework, and our prior exploratory study to investigate the determinants that influence the adoption of cloud computing. An organizational-level survey was conducted across Australia to collect data from technology decision makers in SMEs. Data collected from 203 firms are used to test the related hypotheses. This study contributes …

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Implementation Of Health Technology Assessment Work In A Hospital In Kazakhstan, Lyazzat Kosherbayeva, David M. Hailey, Kural Kurakbaev, Aleksey Tsoy, Ormanbek Zhuzzhanov, Abilay Donbay, Ainur Kumar, Kamalzhan Nadyrov Jan 2016

Implementation Of Health Technology Assessment Work In A Hospital In Kazakhstan, Lyazzat Kosherbayeva, David M. Hailey, Kural Kurakbaev, Aleksey Tsoy, Ormanbek Zhuzzhanov, Abilay Donbay, Ainur Kumar, Kamalzhan Nadyrov

Faculty of Engineering and Information Sciences - Papers: Part A

Objectives: The aim of this study was to implement health technology assessment (HA) in the First General City Hospital in Astana, Kazakhstan. Methods: We organized trainings to familiarize hospital staff with the purpose and details of HTA. An HTA committee was established, with representation from hospital physicians and managers, and criteria for prioritization of health technologies determined. Clinical departments of the hospital were asked to prepare applications for new technologies for their services. Results: The HTA committee reviewed five applications and selected a technology from one of these, on single incision laparoscopic surgery (SILS), for assessment. A short HTA report …

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Performance Improvement Of Rail Track Substructure Using Artificial Inclusions - Experimental And Numerical Studies, Buddhima Indraratna, Sanjay Nimbalkar, Ngoc Trung Ngo, Tim Neville Jan 2016

Performance Improvement Of Rail Track Substructure Using Artificial Inclusions - Experimental And Numerical Studies, Buddhima Indraratna, Sanjay Nimbalkar, Ngoc Trung Ngo, Tim Neville

Faculty of Engineering and Information Sciences - Papers: Part A

Large and frequent loads from heavy freight and passenger trains often lead to the progressive track deterioration. The excessive deformation and degradation of ballast and unacceptable differential settlement of track and/or pumping of underlying soft subgrade soils necessitates frequent and costly track maintenance. However, artificial inclusions such as geogrids and shockmats can mitigate ballast degradation and improve track performance. A quantitative assessment of the influence of breakage, fouling, and the effects of artificial inclusions on the shear behaviour of ballast can be performed either experimentally or numerically. Numerical modelling can simulate these aspects subject to various types of loading and …

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Determination Of Stress State In Rock Mass Using Strain Gauge Probes Ccbo, Petr Waclawik, Stas Lubomir, Jan Nemcik, Petr Konicek, Tomas Kalab Jan 2016

Determination Of Stress State In Rock Mass Using Strain Gauge Probes Ccbo, Petr Waclawik, Stas Lubomir, Jan Nemcik, Petr Konicek, Tomas Kalab

Faculty of Engineering and Information Sciences - Papers: Part A

The strain gauge probes of different construction are typically used for determination of stress state rock mass. The modified overcoring method known as the Compact Conical ended Borehole Overcoring method (CCBO) for stress state determination in rock mass was designed in Institute of Geonics of the CAS (IGN) in cooperation with Kumamoto University in Japan. The implemented adjustment of the overcoring method consists mainly in omitting the overcoring phase (stress relief phase). The probe is glued directly to the conically shaped end of a borehole. The data logger located within the conical probe enables continual strain monitoring directly in the …

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An Elasto-Plastic Method For Analysing The Deformation Of The Railway Ballast, Qideng Sun, Buddhima Indraratna, Sanjay Nimbalkar Jan 2016

An Elasto-Plastic Method For Analysing The Deformation Of The Railway Ballast, Qideng Sun, Buddhima Indraratna, Sanjay Nimbalkar

Faculty of Engineering and Information Sciences - Papers: Part A

In this study, a series of monotonically drained triaxial tests were conducted using the large-scale cylindrical triaxial apparatus. The effect of particle breakage and confining pressure on the mechanical behaviour of ballast were investigated. Based on the experimental findings, mathematical expressions for critical state stress ratio and specific volume are proposed to incorporate the evolution of particle breakage during monotonic shearing. An elasto-plastic constitutive model is formulated within the critical state soil mechanics framework in order to capture the stress-strain behaviour and degradation of ballast. The non-linear variation of shear strength envelope at a given range of confining pressures is …

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Mineral Phase Formation And Zinc Removal During Sintering Of Filter Cake Wastes, Zhe Wang, David J. Pinson, Sheng Chew, Brian J. Monaghan, Harold P. Rogers, Guangqing Zhang Jan 2016

Mineral Phase Formation And Zinc Removal During Sintering Of Filter Cake Wastes, Zhe Wang, David J. Pinson, Sheng Chew, Brian J. Monaghan, Harold P. Rogers, Guangqing Zhang

Faculty of Engineering and Information Sciences - Papers: Part A

A large amount of filter cake wastes are produced from the gas cleaning systems of blast furnace (BF) ironmaking and basic oxygen furnace (BOF) steelmaking processes. The filter cake wastes cannot be directly recycled through the ironmaking process due to the high zinc contents and are therefore, predominantly, stockpiled. The storage of filter cake wastes presents a long- Term environmental issue but also an opportunity to extract or recover the iron content, motivating a search for processes or technologies to allow their cost-effective recycling. In this study, two filter cake wastes from BlueScope Ltd. were sintered at 1 100-1 300°C …

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Microstructure And Micro-Texture Evolution During The Dynamic Recrystallisation Of A Ni-30fe-Nb-C Model Alloy, Parvez Mannan, Ahmed A. Saleh, Azdiar A. Gazder, Gilberto Casillas, Elena V. Pereloma Jan 2016

Microstructure And Micro-Texture Evolution During The Dynamic Recrystallisation Of A Ni-30fe-Nb-C Model Alloy, Parvez Mannan, Ahmed A. Saleh, Azdiar A. Gazder, Gilberto Casillas, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

The evolution of microstructure and micro-texture during discontinuous dynamic recrystallisation of an austenitic Ni-30Fe-Nb-C model alloy subjected to interrupted plane strain compression at strains (ε) of 0.23, 0.35, 0.68, 0.85 and 1.2 was investigated using electron backscattering diffraction and transmission electron microscopy. Throughout the strain range, the majority of dynamic recrystallisation events comprised nucleation in necklace-like arrangements located at and along grain boundaries via bulging. At ε ≥ 0.68, discrete nucleation events were also observed within grain interiors. Grain growth during dynamic recrystallisation is characteristic of strain induced boundary migration. The initial texture comprised Cube-RD ({013}〈100〉), Cube-ND ({001}〈310〉) and Cube …

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Towards An Automated Robotic Arc-Welding-Based Additive Manufacturing System From Cad To Finished Part, Donghong Ding, Chen Shen, Zengxi Stephen Pan, Dominic Cuiuri, Hui Jun Li, Nathan P. Larkin, Stephen Van Duin Jan 2016

Towards An Automated Robotic Arc-Welding-Based Additive Manufacturing System From Cad To Finished Part, Donghong Ding, Chen Shen, Zengxi Stephen Pan, Dominic Cuiuri, Hui Jun Li, Nathan P. Larkin, Stephen Van Duin

Faculty of Engineering and Information Sciences - Papers: Part A

Arc welding has been widely explored for additive manufacturing of large metal components over the last three decades due to its lower capital cost, an unlimited build envelope, and higher deposition rates. Although significant improvements have been made, an arc welding process has yet to be incorporated in a commercially available additive manufacturing system. The next step in exploiting "true" arc-welding-based additive manufacturing is to develop the automation software required to produce CAD-to-part capability. This study focuses on developing a fully automated system using robotic gas metal arc welding to additively manufacture metal components. The system contains several modules, including …

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Reduction Of Quartz To Silicon Monoxide By Methane-Hydrogen Mixtures, Xiang Li, Guangqing Zhang, Ragnar Tronstad, Oleg Ostrovski Jan 2016

Reduction Of Quartz To Silicon Monoxide By Methane-Hydrogen Mixtures, Xiang Li, Guangqing Zhang, Ragnar Tronstad, Oleg Ostrovski

Faculty of Engineering and Information Sciences - Papers: Part A

The reduction of quartz was studied isothermally in a fluidized bed reactor using continuously flowing methane-hydrogen gas mixture in the temperature range from 1623 K to 1773 K (1350 °C to 1500 °C). The CO content in the off-gas was measured online using an infrared gas analyzer. The main phases of the reduced samples identified by XRD analysis were quartz and cristobalite. Significant weight loss in the reduction process indicated that the reduction products were SiO and CO. Reduction of SiO2 to SiO by methane starts with adsorption and dissociation of CH4 on the silica surface. The high carbon activity …

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Rapid Transformation Of Hexagonal To Cubic Silicon Carbide (Sic) By Electric Discharge Assisted Mechanical Milling, Iis Siti Aisyah, Monika Wyszomirska, Andrzej Calka, David Wexler Jan 2016

Rapid Transformation Of Hexagonal To Cubic Silicon Carbide (Sic) By Electric Discharge Assisted Mechanical Milling, Iis Siti Aisyah, Monika Wyszomirska, Andrzej Calka, David Wexler

Faculty of Engineering and Information Sciences - Papers: Part A

Silicon carbide powder was successfully transformed from hexagonal SiC into cubic SiC using the electric discharge assisted mechanical milling (EDAMM) method. The milling process was conducted in nitrogen plasma at atmospheric pressure. The effects of pulsed alternating current (AC) and direct current (DC) discharge on product formation were investigated. Products were characterized by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy and nanohardness. It was found that hexagonal SiC can be transformed into cubic SiC under EDAMM processing, near complete transformation occurring within 5 min when applying AC mode electrical pulses, and within 10 min when applying DC mode discharges.

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State Of The Art Of Control Schemes For Smart Systems Featuring Magneto-Rheological Materials, Seung-Bok Choi, Weihua Li, Miao Yu, Haiping Du, Jie Fu, Phu Xuan Do Jan 2016

State Of The Art Of Control Schemes For Smart Systems Featuring Magneto-Rheological Materials, Seung-Bok Choi, Weihua Li, Miao Yu, Haiping Du, Jie Fu, Phu Xuan Do

Faculty of Engineering and Information Sciences - Papers: Part A

This review presents various control strategies for application systems utilizing smart magneto-rheological fluid (MRF) and magneto-rheological elastomers (MRE). It is well known that both MRF and MRE are actively studied and applied to many practical systems such as vehicle dampers. The mandatory requirements for successful applications of MRF and MRE include several factors: advanced material properties, optimal mechanisms, suitable modeling, and appropriate control schemes. Among these requirements, the use of an appropriate control scheme is a crucial factor since it is the final action stage of the application systems to achieve the desired output responses. There are numerous different control …

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Microstructures And Mechanical Properties Of Trip Steel Produced By Strip Casting Simulated In The Laboratory, Zhiping Xiong, Andrii Kostryzhev, Ahmed A. Saleh, Liang Chen, Elena V. Pereloma Jan 2016

Microstructures And Mechanical Properties Of Trip Steel Produced By Strip Casting Simulated In The Laboratory, Zhiping Xiong, Andrii Kostryzhev, Ahmed A. Saleh, Liang Chen, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

Conventional transformation induced plasticity (TRIP) steel (0.17C-1.52Si-1.61Mn-0.03Al, wt%) was produced via strip casting technology simulated in the laboratory. Effects of holding temperature, holding time and cooling rate on ferrite formation were studied via analysis of the continuous cooling transformation diagram obtained here. A typical microstructure for conventional TRIP steels consisting of ~ 0.55 fraction of polygonal ferrite with bainite, retained austenite and martensite was obtained. However, coarse prior austenite grain size of ~80 μm led to large polygonal ferrite grain size of ~17 μm, coarse second phase regions of ~21 μm size, small amount of retained austenite (0.02-0.045) and the …

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Special Rolling Techniques For Improvement Of Mechanical Properties Of Ultrafine-Grained Metal Sheets: A Review, Hai Liang Yu, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Ajit R. Godbole, Shi-Hong Zhang Jan 2016

Special Rolling Techniques For Improvement Of Mechanical Properties Of Ultrafine-Grained Metal Sheets: A Review, Hai Liang Yu, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Ajit R. Godbole, Shi-Hong Zhang

Faculty of Engineering and Information Sciences - Papers: Part A

Interest in ultrafine-grained (UFG) materials has grown rapidly in past 20 years. This review focuses on the application of special rolling techniques for improvement of the mechanical properties of UFG metal sheets. These techniques include asymmetric rolling, cryorolling, asymmetric cryorolling, cross-accumulative roll bonding, and skin-pass rolling. The techniques also include a combination of processes such as equal channel angular press and subsequent rolling, combined high-pressure torsion and subsequent rolling, as well as combined accumulative roll bonding and subsequent asymmetric rolling. We also discuss the main mechanisms leading to improvement in the ductility of UFG materials related to the special rolling …

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The Rheology Of Shear Thickening Fluids With Various Ceramic Particle Additives, Selim Gürgen, Weihua Li, Melih Cemal Kushan Jan 2016

The Rheology Of Shear Thickening Fluids With Various Ceramic Particle Additives, Selim Gürgen, Weihua Li, Melih Cemal Kushan

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, shear thickening fluids (STFs) and three different types of additive particles such as silicon carbide, aluminum oxide and boron carbide are presented. STFs were fabricated based on nanosize fumed silica suspended in a liquid medium, polyethylene glycol at a constant concentration of 20 wt%, and then varying amounts of different types of particle additives were added. Their rheological properties under various temperatures were tested using a rheometer, and the effects of silica loading on the rheology of pure STF were investigated. The suspensions exhibited different systematic variations with respect to the varied parameters.

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Orthogonal Experimental Design Of Titanium Dioxide - Poly(Methyl Methacrylate) Electrospun Nanocomposite Membranes For Photocatalytic Applications, Andrew Vild, Sara Teixeira, Klaus Kuhn, Gianaurelio Cuniberti, Vitor Sencadas Jan 2016

Orthogonal Experimental Design Of Titanium Dioxide - Poly(Methyl Methacrylate) Electrospun Nanocomposite Membranes For Photocatalytic Applications, Andrew Vild, Sara Teixeira, Klaus Kuhn, Gianaurelio Cuniberti, Vitor Sencadas

Faculty of Engineering and Information Sciences - Papers: Part A

An orthogonal experimental method was designed to assess the influence of the electrospinning processing parameters on average diameter and distribution of poly(methyl methacrylate) (PMMA) fibers. Based on the orthogonal experimental design analysis, electrospun TiO2-PMMA nanocomposites were processed with the optimal polymer processing conditions to obtain thin fibers with a high overall surface area. Further it was found that the average fiber diameter decreases from 2.0 ± 0.5 down to 1.2 ± 0.2 μm with increasing photocatalyst content. Moreover, the wettability of samples was independent of the filler amount, and showed strong hydrophobic behavior. Thermogravimetric analysis showed that for polymer solutions …

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Developing An Optimum Maintenance Policy By Life Cycle Cost Analysis - A Case Study, Khaled O. El-Akruti, Tieling Zhang, Richard Dwight Jan 2016

Developing An Optimum Maintenance Policy By Life Cycle Cost Analysis - A Case Study, Khaled O. El-Akruti, Tieling Zhang, Richard Dwight

Faculty of Engineering and Information Sciences - Papers: Part A

This paper focuses on developing maintenance policies for critical assets to improve the production performance based on life cycle cost (LCC) analysis. A general approach is adopted for conducting the LCC analysis. The investigation is based on a case study to demonstrate how an optimum maintenance policy is determined. The relevant LCC structure in the case study is defined for the decision process which involves determination of the optimum life, repair limit and selection of materials, and trade-off between repair and replacement. The LCC analysis is based on statistical data modelling which facilitates decision-making on the optimal replacement of an …

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On The Feasibility Of Partial Slip Reversal And De-Twinning During The Cyclic Loading Of Twip Steel, Ahmed A. Saleh, Bjorn Clausen, Donald W. Brown, Elena V. Pereloma, Christopher H. J Davies, Carlos N. Tome, Azdiar A. Gazder Jan 2016

On The Feasibility Of Partial Slip Reversal And De-Twinning During The Cyclic Loading Of Twip Steel, Ahmed A. Saleh, Bjorn Clausen, Donald W. Brown, Elena V. Pereloma, Christopher H. J Davies, Carlos N. Tome, Azdiar A. Gazder

Faculty of Engineering and Information Sciences - Papers: Part A

A recently modified Elasto-Plastic Self-Consistent (EPSC) model which empirically accounts for both intergranular and intragranular back stresses has been successfully used to simulate the cyclic (tension-compression) loading behaviour of an Fe-24Mn-3Al-2Si-1Ni-0.06C TWinning Induced Plasticity (TWIP) steel between strain limits of ±1%. Lattice strain measurements acquired via in-situ neutron diffraction were used to further validate the modelling results. An improved prediction of the pronounced Bauschinger effect during unloading is achieved when the reversibility of partial slip in the 〈112〉 direction is accounted for. This result indicates a potential contribution of the stress-induced separation of partial dislocations to the observed early yielding …

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Enhanced Mechanical Properties Of Arb-Processed Aluminum Alloy 6061 Sheets By Subsequent Asymmetric Cryorolling And Ageing, Hai Liang Yu, Lihong Su, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Jintao Li, Ajit R. Godbole, Charlie Kong Jan 2016

Enhanced Mechanical Properties Of Arb-Processed Aluminum Alloy 6061 Sheets By Subsequent Asymmetric Cryorolling And Ageing, Hai Liang Yu, Lihong Su, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Jintao Li, Ajit R. Godbole, Charlie Kong

Faculty of Engineering and Information Sciences - Papers: Part A

Grain size and precipitations affect the strength and ductility of ultrafine-grained materials. In this study, aluminum alloy 6061 sheets were fabricated using the accumulative roll bonding (ARB) technique. The ARB-processed sheets were subsequently subjected to cryorolling and asymmetric cryorolling. The sheets were further aged at 100 °C for 48 h. Mechanical tests show that a combination of asymmetric cryorolling and ageing results in significant improvement in both the ductility and the strength of the ARB-processed sheets. The microstructures of the sheets at different stages of the process were also analyzed using optical microscopy, scanning electron microscopy, transmission electron microscopy and …

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Effect Of Cyano Dipolar Groups On The Performance Of Lithium-Ion Battery Electrospun Polyimide Gel Electrolyte Membranes, A Maceiras, A Goren, Vitor Sencadas, Carlos M. Costa, J L. Vilas, Senentxu Lanceros-Méndez, L M. Leon Jan 2016

Effect Of Cyano Dipolar Groups On The Performance Of Lithium-Ion Battery Electrospun Polyimide Gel Electrolyte Membranes, A Maceiras, A Goren, Vitor Sencadas, Carlos M. Costa, J L. Vilas, Senentxu Lanceros-Méndez, L M. Leon

Faculty of Engineering and Information Sciences - Papers: Part A

Three polyimide membranes (polymer 0CN, copolymers 0CN/2CN (50/50) and polymer 2CN), with and without [Formula presented] dipolar groups, have been prepared by electrospinning and evaluated as lithium-ion battery separators. The prepared membranes show average fiber diameters between 0.5 and 1.09 μm and a degree of porosity of ~ 80%. The thermal stability, uptake, tortuosity and ionic conductivity values are influenced by the presence of the [Formula presented] dipolar groups in the polyimide polymer chain. The best battery performance in LFP/Li system is obtained for the 0CN sample, which shows discharge capacity values of 149.7 mAh·g− 1, 146.5 mAh·g− 1 and …

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Influence Of Cr-Rich Oxide Scale On Sliding Wear Mechanism Of Ferritic Stainless Steel At High Temperature, Xiawei Cheng, Zhengyi Jiang, Buyung Kosasih, Hui Wu, Suzhen Luo, Laizhu Jiang Jan 2016

Influence Of Cr-Rich Oxide Scale On Sliding Wear Mechanism Of Ferritic Stainless Steel At High Temperature, Xiawei Cheng, Zhengyi Jiang, Buyung Kosasih, Hui Wu, Suzhen Luo, Laizhu Jiang

Faculty of Engineering and Information Sciences - Papers: Part A

The tribological tests of a ferritic stainless steel (FSS) 445 in contact with high-speed steel (HSS) were performed on a high-temperature pin-on-disc tribometer. Wear exhibited significant difference when the FSS 445 was oxidised with a Cr-rich oxide scale on the surface. The HSS pin displayed adhesive wear when there was no oxide scale on the stainless steel disc, and in the early stages, the coefficient of friction fluctuated significantly, but the level of wear changed as Cr2O3 particles formed. The wear was then reduced, and the coefficient of friction remained stable. The Cr-rich oxide scale which formed on the stainless …

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The Evolution In The Stellar Mass Of Brightest Cluster Galaxies Over The Past 10 Billion Years, Sabine Bellstedt, Christopher E. Lidman, Adam Muzzin, Marijn Franx, Susanna Guatelli, Allison R. Hill, Henk Hoekstra, Noah Kurinsky, Ivo Labbe, Danilo Marchesini, Z. Cemile Marsan, Mitra Safavi-Naeini, Cristobal Sifon, Mauro Stefanon, Jesse Van De Sande, Pieter Van Dokkum, Catherine Weigel Jan 2016

The Evolution In The Stellar Mass Of Brightest Cluster Galaxies Over The Past 10 Billion Years, Sabine Bellstedt, Christopher E. Lidman, Adam Muzzin, Marijn Franx, Susanna Guatelli, Allison R. Hill, Henk Hoekstra, Noah Kurinsky, Ivo Labbe, Danilo Marchesini, Z. Cemile Marsan, Mitra Safavi-Naeini, Cristobal Sifon, Mauro Stefanon, Jesse Van De Sande, Pieter Van Dokkum, Catherine Weigel

Faculty of Engineering and Information Sciences - Papers: Part A

Using a sample of 98 galaxy clusters recently imaged in the near-infrared with the European Southern Observatory (ESO) New Technology Telescope, WIYN telescope and William Her- schel Telescope, supplemented with 33 clusters from the ESO archive, we measure how the stellar mass of the most massive galaxies in the universe, namely brightest cluster galaxies (BCGs), increases with time. Most of the BCGs in this new sample lie in the redshift range 0.2

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Young's Modulus Measurement Using Fibre-Coupled Self-Mixing Laser Diode, Ke Lin, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong, Hui Jun Li Jan 2016

Young's Modulus Measurement Using Fibre-Coupled Self-Mixing Laser Diode, Ke Lin, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong, Hui Jun Li

Faculty of Engineering and Information Sciences - Papers: Part A

A new fibre-coupled self-mixing laser diode is developed for measurement of Young's modulus. Instead of transmission in free space, the light path is coupled in a fibre, which enables the measuring system easily and feasibly to be installed in many application cases. A specimen made of aluminium alloy 6061 is tested by the system designed. The obtained value of Young's modulus is 70.02 GPa with 0.16% measurement accuracy, showing a high repeatability and a good agreement with the standard values reported in literatures.

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