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Articles 1 - 30 of 6547

Full-Text Articles in Engineering

Grain Boundary Induced Deformation Mechanisms In Nanocrystalline Al By Molecular Dynamics Simulation: From Interatomic Potential Perspective, Liang Zhang, Yasushi Shibuta, Xiaoxu Huang, Cheng Lu, Mao Liu Jan 2019

Grain Boundary Induced Deformation Mechanisms In Nanocrystalline Al By Molecular Dynamics Simulation: From Interatomic Potential Perspective, Liang Zhang, Yasushi Shibuta, Xiaoxu Huang, Cheng Lu, Mao Liu

Faculty of Engineering and Information Sciences - Papers: Part B

Nanocrystalline metals exhibit many excellent mechanical properties and their underlying deformation mechanisms have been studying widespread. The well-designed atomistic simulations can predict the mechanical behavior of materials ahead of experiments and provide sufficient information on the atomic scale. The choice of appropriate interatomic potential is one of the main concerns of any atomistic simulation that needs to be seriously considered in order to obtain reliable results. In this study, we investigated the mechanical response and the deformation mechanisms of nanocrystalline Al under uniaxial loading by molecular dynamics (MD) simulations with different embedded atom method (EAM) interatomic potentials. The selection of ...


A New Method For Direct Tensile Testing Of Concrete, Faez Alhussainy, Hayder Alaa Hasan, M Neaz Sheikh, Muhammad N. S Hadi Jan 2019

A New Method For Direct Tensile Testing Of Concrete, Faez Alhussainy, Hayder Alaa Hasan, M Neaz Sheikh, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

Different testing methods were used in previous studies to measure the direct tensile strength of concrete. However, these methods experienced several major deficiencies such as stress concentration at the end of the specimens because of inadequate gripping and loading eccentricity and nonuniform fracture plane because of difficulties in aligning and centering the specimens during testing. This study presents the details of a new method of testing concrete under uniaxial tension. The method was developed to overcome the difficulties associated with testing methods adopted in the previous research studies. A full description of the wooden molds used in casting the specimens ...


In Operando Mechanism Analysis On Nanocrystalline Silicon Anode Material For Reversible And Ultrafast Sodium Storage, Lei Zhang, Xianluo Hu, Chaoji Chen, Haipeng Guo, Xiaoxiao Liu, Gengzhao Xu, Haijian Zhong, Shuang Cheng, Peng Wu, Jiashen Meng, Yunhui Huang, Shi Xue Dou, Hua-Kun Liu Mar 2018

In Operando Mechanism Analysis On Nanocrystalline Silicon Anode Material For Reversible And Ultrafast Sodium Storage, Lei Zhang, Xianluo Hu, Chaoji Chen, Haipeng Guo, Xiaoxiao Liu, Gengzhao Xu, Haijian Zhong, Shuang Cheng, Peng Wu, Jiashen Meng, Yunhui Huang, Shi Xue Dou, Hua-Kun Liu

Australian Institute for Innovative Materials - Papers

Presently, lithium-ion batteries (LIBs) are the most promising commercialized electrochemical energy storage systems. Unfortunately, the limited resource of Li results in increasing cost for its scalable application and a general consciousness of the need to find new type of energy storage technologies. Very recently, substantial effort has been invested to sodium-ion batteries (SIBs) due to their effectively unlimited nature of sodium resources. Furthermore, the potential of Li/Li+ is 0.3 V lower than that of Na/Na+, which makes it more effective to limit the electrolyte degradation on the outer surface of the electrode.[1] Nevertheless, one major obstacle ...


Development Of A Nonlinear Adaptive Absorber Based On Magnetorheological Elastomer, Shuaishuai Sun, Jian Yang, Tanju Yildirim, Haiping Du, Gursel Alici, Shiwu Zhang, Weihua Li Jan 2018

Development Of A Nonlinear Adaptive Absorber Based On Magnetorheological Elastomer, Shuaishuai Sun, Jian Yang, Tanju Yildirim, Haiping Du, Gursel Alici, Shiwu Zhang, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

The resonance shift property of magnetorheological elastomer is important for developing adaptive absorbers. However, it is well-known that passive nonlinear absorbers have wider effective frequency bandwidths. This article combines these two characteristics in order to develop a hybrid magnetorheological elastomer absorber which can shift its natural frequency and has a wider absorption bandwidth under each constant current. The adaptability and nonlinearity were fully verified experimentally. Afterwards, the absorption ability of the hybrid magnetorheological elastomer absorber was investigated and analyzed. The results show that the effective bandwidth of this absorber is broadened under certain levels of current than linear absorber, and ...


The Effect Of A Dissipative Ladle Shroud On Mixing In Tundish: Mathematical And Experimental Modelling, Jiangshan Zhang, Shufeng Yang, Jingshe Li, Haiyan Tang, Zhengyi Jiang Jan 2018

The Effect Of A Dissipative Ladle Shroud On Mixing In Tundish: Mathematical And Experimental Modelling, Jiangshan Zhang, Shufeng Yang, Jingshe Li, Haiyan Tang, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

The effect of a dissipative ladle shroud (DLS) on mixing in tundish was investigated, compared with that of a conventional ladle shroud (CLS) using mathematical and physical modelling. The tracer profiles of mathematical results, achieved using large eddy simulation, were validated by physical observations employing high-speed cinephotography. The design of a DLS dramatically changed the flow patterns and contributed the intermixing of fluid elements inside the ladle shroud. The vortex flow encouraged the turbulent mixing and was verified by tracking of physical tracer dispersion inside the DLS. Residence Time Distribution (RTD) curves were obtained in two different sized tundishes to ...


Radiation Characteristics Of Natural Gamma-Ray From Coal And Gangue For Recognition In Top Coal Caving, Ningbo Zhang, Changyou Liu Jan 2018

Radiation Characteristics Of Natural Gamma-Ray From Coal And Gangue For Recognition In Top Coal Caving, Ningbo Zhang, Changyou Liu

Faculty of Engineering and Information Sciences - Papers: Part B

Recognition of coal and gangue (roof rock) is a key technology to realize fully mechanized top coal caving automated mining. This paper proposes to detect the instantaneous refuse content of drawn coal and gangue mixture during top coal caving by using natural gamma-ray technology. The generating environment of coal and rock seams, the distribution characteristics of natural gamma ray from coal and roof-rock and the principle of coal-gangue recognition using natural gamma-ray method were analyzed. The natural gamma ray radiation characteristics of coal and roof-rock seams from seven different typical coal mine areas who has thick coal seams in China ...


Multiple Speech Source Separation Using Inter-Channel Correlation And Relaxed Sparsity, Maoshen Jia, Jundai Sun, Xiguang Zheng Jan 2018

Multiple Speech Source Separation Using Inter-Channel Correlation And Relaxed Sparsity, Maoshen Jia, Jundai Sun, Xiguang Zheng

Faculty of Engineering and Information Sciences - Papers: Part B

In this work, a multiple speech source separation method using inter-channel correlation and relaxed sparsity is proposed. A B-format microphone with four spatially located channels is adopted due to the size of the microphone array to preserve the spatial parameter integrity of the original signal. Specifically, we firstly measure the proportion of overlapped components among multiple sources and find that there exist many overlapped time-frequency (TF) components with increasing source number. Then, considering the relaxed sparsity of speech sources, we propose a dynamic threshold-based separation approach of sparse components where the threshold is determined by the inter-channel correlation among the ...


Integrated Active And Semi-Active Control For Seat Suspension Of A Heavy Duty Vehicle, Donghong Ning, Shuaishuai Sun, Haiping Du, Weihua Li Jan 2018

Integrated Active And Semi-Active Control For Seat Suspension Of A Heavy Duty Vehicle, Donghong Ning, Shuaishuai Sun, Haiping Du, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

In this article, an integrated active and semi-active seat suspension for heavy duty vehicles is proposed, and its prototype is built; an integrated control algorithm applied measurable variables (suspension relative displacement and seat acceleration) is designed for the proposed seat prototype. In this seat prototype, an active actuator with low maximum force output (70 N), which is insufficient for an active seat suspension to control the resonance vibration, is applied together with a rotary magnetorheological damper. The magnetorheological damper can suppress the high vibration energy in resonance frequency, and then a small active force can further improve the seat suspension ...


A System Model For Personalized Medication Management (Mymediman)-The Consumers' Point Of View, Elena Vlahu-Gjorgievska, Khin Than Win, Willy Susilo Jan 2018

A System Model For Personalized Medication Management (Mymediman)-The Consumers' Point Of View, Elena Vlahu-Gjorgievska, Khin Than Win, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, we propose a design for a personalized medication management system model MyMediMan that provides medication information for different stakeholders. The focus of the paper is on the system's features and personalized information provided for the consumers as primary users of the proposed solution. The presented design introduces the consumers to different aspects of the medications they take and their overall health condition. The personalized information should increase the consumers' awareness about the positive benefits of taking the medications as well as the consequences that particular medication can have on their health condition. By obtaining this information ...


Multizone Soundfield Reproduction With Privacy- And Quality-Based Speech Masking Filters, Jacob Donley, Christian H. Ritz, W Kleijn Jan 2018

Multizone Soundfield Reproduction With Privacy- And Quality-Based Speech Masking Filters, Jacob Donley, Christian H. Ritz, W Kleijn

Faculty of Engineering and Information Sciences - Papers: Part B

Reproducing zones of personal sound is a challenging signal processing problem which has garnered considerable research interest in recent years. We introduce in this work an extended method to multizone soundfield reproduction which overcomes issues with speech privacy and quality. Measures of Speech Intelligibility Contrast (SIC) and speech quality are used as cost functions in an optimisation of speech privacy and quality. Novel spatial and (temporal) frequency domain speech masker filter designs are proposed to accompany the optimisation process. Spatial masking filters are designed using multizone soundfield algorithms which are dependent on the target speech multizone reproduction. Combinations of estimates ...


Engineering Properties Of Ambient Cured Alkali-Activated Slag-Fly Ash Concrete Reinforced With Different Types Of Steel Fiber, Nabeel Farhan, M Neaz Sheikh, Muhammad N. S Hadi Jan 2018

Engineering Properties Of Ambient Cured Alkali-Activated Slag-Fly Ash Concrete Reinforced With Different Types Of Steel Fiber, Nabeel Farhan, M Neaz Sheikh, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

This paper investigates the influence of different types of steel fibers on the engineering properties of ambient cured alkali-activated slag-fly ash concrete. The engineering properties investigated include workability, compressive strength, splitting tensile strength, flexural strength, direct tensile strength, and stress-strain response under axial compression. Three types of steel fibers, i.e., straight micro steel fiber, deformed macro steel fiber and hybrid steel fiber, were added to the alkali-activated slag-fly ash mixes. It was found that the workability of the alkali-activated slag-fly ash concrete mixes decreased with the increase in the volume fraction of steel fibers. It was also found that ...


A Stabilization Theorem For Fell Bundles Over Groupoids, Marius Ionescu, Alexander Kumjian, Aidan Sims, Dana P. Williams Jan 2018

A Stabilization Theorem For Fell Bundles Over Groupoids, Marius Ionescu, Alexander Kumjian, Aidan Sims, Dana P. Williams

Faculty of Engineering and Information Sciences - Papers: Part B

We study the C * -algebras associated with upper semi-continuous Fell bundles over second-countable Hausdorff groupoids. Based on ideas going back to the Packer-Raeburn 'stabilization trick', we construct from each such bundle a groupoid dynamical system whose associated Fell bundle is equivalent to the original bundle. The upshot is that the full and reduced C * -algebras of any saturated upper semi-continuous Fell bundle are stably isomorphic to the full and reduced crossed products of an associated dynamical system. We apply our results to describe the lattice of ideals of the C * -algebra of a continuous Fell bundle by applying Renault's ...


Resilience And Sustainability In The Management Of Landslides, Phillip N. Flentje, Robin N. Chowdhury Jan 2018

Resilience And Sustainability In The Management Of Landslides, Phillip N. Flentje, Robin N. Chowdhury

Faculty of Engineering and Information Sciences - Papers: Part A

There are many regions worldwide which are susceptible to landslides, which cause loss of life and adverse impacts to infrastructure, environment and communities. Landslides are often triggered by exceptional rainfall and large-magnitude earthquakes. A range of strategies and methods have been developed to mitigate the occurrence of landslides and to reduce their impact, including risk to human safety. The adopted approaches and systems must be sustainable and resilient in relation to the communities that are at risk. This paper refers to an Australian regional case study of urban landslide management in the Wollongong region, New South Wales. The research carried ...


Graded Steinberg Algebras And Their Representations, Pere Ara, Roozbeh Hazrat, Huanhuan Li, Aidan Sims Jan 2018

Graded Steinberg Algebras And Their Representations, Pere Ara, Roozbeh Hazrat, Huanhuan Li, Aidan Sims

Faculty of Engineering and Information Sciences - Papers: Part B

We study the category of left unital graded modules over the Steinberg algebra of a graded ample Hausdorff groupoid. In the first part of the paper, we show that this category is isomorphic to the category of unital left modules over the Steinberg algebra of the skew-product groupoid arising from the grading. To do this, we show that the Steinberg algebra of the skew product is graded isomorphic to a natural generalisation of the Cohen-Montgomery smash product of the Steinberg algebra of the underlying groupoid with the grading group. In the second part of the paper, we study the minimal ...


The Impact Of Imaging Modality (Ct Vs Mri) And Patient Position (Supine Vs Prone) On Tangential Whole Breast Radiation Therapy Planning, Kylie L. Dundas, Elise M. Pogson, Vikneswary Batumalai, Geoff P. Delaney, Miriam M. Boxer, Mei Ling Yap, Verity Ahern, Christine Chan, Steven David, Marion Dimigen, Jennifer A. Harvey, Eng-Siew Koh, Karen Lim, George Papadatos, Elizabeth Lazarus, Joseph Descellar, Peter E. Metcalfe, Lois C. Holloway Jan 2018

The Impact Of Imaging Modality (Ct Vs Mri) And Patient Position (Supine Vs Prone) On Tangential Whole Breast Radiation Therapy Planning, Kylie L. Dundas, Elise M. Pogson, Vikneswary Batumalai, Geoff P. Delaney, Miriam M. Boxer, Mei Ling Yap, Verity Ahern, Christine Chan, Steven David, Marion Dimigen, Jennifer A. Harvey, Eng-Siew Koh, Karen Lim, George Papadatos, Elizabeth Lazarus, Joseph Descellar, Peter E. Metcalfe, Lois C. Holloway

Faculty of Engineering and Information Sciences - Papers: Part B

Purpose

The purpose of this study was to evaluate the impact of magnetic resonance imaging (MRI) versus computed tomography (CT)-derived planning target volumes (PTVs), in both supine and prone positions, for whole breast (WB) radiation therapy.

Methods and materials

Four WB radiation therapy plans were generated for 28 patients in which PTVs were generated based on CT or MRI data alone in both supine and prone positions. A 6-MV tangential intensity modulated radiation therapy technique was used, with plans designated as ideal, acceptable, or noncompliant. Dose metrics for PTVs and organs at risk were compared to analyze any differences ...


Laser Self-Mixing Fiber Bragg Grating Sensor For Acoustic Emission Measurement, Bin Liu, Yuxi Ruan, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong, Ginu Rajan Jan 2018

Laser Self-Mixing Fiber Bragg Grating Sensor For Acoustic Emission Measurement, Bin Liu, Yuxi Ruan, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong, Ginu Rajan

Faculty of Engineering and Information Sciences - Papers: Part B

Fiber Bragg grating (FBG) is considered a good candidate for acoustic emission (AE) measurement. The sensing and measurement in traditional FBG-based AE systems are based on the variation in laser intensity induced by the Bragg wavelength shift. This paper presents a sensing system by combining self-mixing interference (SMI) in a laser diode and FBG for AE measurement, aiming to form a new compact and cost-effective sensing system. The measurement model of the overall system was derived. The performance of the presented system was investigated from both aspects of theory and experiment. The results show that the proposed system is able ...


Study Of The Susceptibility Of Coal For Spontaneous Combustion Using Adiabatic Oxidation Method, Ravi Rambha, Ting X. Ren Jan 2018

Study Of The Susceptibility Of Coal For Spontaneous Combustion Using Adiabatic Oxidation Method, Ravi Rambha, Ting X. Ren

Faculty of Engineering and Information Sciences - Papers: Part B

Largest contributor for fires in a coal mill is due to presence of combustible materials in pulverisers. Dry coal that is accumulating or settling in pulveriser components can spontaneously ignite. Aim of this study was to investigate the effect of moisture content, relative humidity of airflow, airflow rates, coal size fractions, nitrogen suppression and prior oxidation on the susceptibility of coal for spontaneous combustion. Adiabatic oxidation method was adopted whereby spontaneous heating potential was measured according to total temperature rise (TTR) while considering temperature rise versus time. Results demonstrated that humidity of air is an important factor in deciding whether ...


Model Predictive Control (Mpc) For Enhancing Building And Hvac System Energy Efficiency: Problem Formulation, Applications And Opportunities, Gianluca Serale, Massimo Fiorentini, Alfonso Capozzoli, Daniele Bernardini, Alberto Bemporad Jan 2018

Model Predictive Control (Mpc) For Enhancing Building And Hvac System Energy Efficiency: Problem Formulation, Applications And Opportunities, Gianluca Serale, Massimo Fiorentini, Alfonso Capozzoli, Daniele Bernardini, Alberto Bemporad

Faculty of Engineering and Information Sciences - Papers: Part B

In the last few years, the application of Model Predictive Control (MPC) for energy management in buildings has received significant attention from the research community. MPC is becoming more and more viable because of the increase in computational power of building automation systems and the availability of a significant amount of monitored building data. MPC has found successful implementation in building thermal regulation, fully exploiting the potential of building thermal mass. Moreover, MPC has been positively applied to active energy storage systems, as well as to the optimal management of on-site renewable energy sources. MPC also opens up several opportunities ...


Efficient Cost Aggregation For Feature-Vector-Based Wide-Baseline Stereo Matching, Xiaoming Peng, Abdesselam Bouzerdoum, Son Lam Phung Jan 2018

Efficient Cost Aggregation For Feature-Vector-Based Wide-Baseline Stereo Matching, Xiaoming Peng, Abdesselam Bouzerdoum, Son Lam Phung

Faculty of Engineering and Information Sciences - Papers: Part B

In stereo matching applications, local cost aggregation techniques are usually preferred over global methods due to their speed and ease of implementation. Local methods make implicit smoothness assumptions by aggregating costs within a finite window; however, cost aggregation is a time-consuming process. Furthermore, most existing local methods are based on pixel intensity values, and hence are not efficient with feature vectors used in wide-baseline stereo matching. In this paper, a new cost aggregation method is proposed, where a Per-Column Cost matrix is combined with a feature-vector-based weighting strategy to achieve both matching accuracy and computational efficiency. Here, the proposed cost ...


Hadamard Matrices, Orthogonal Designs And Clifford-Gastineau-Hills Algebras, Jennifer Seberry Jan 2018

Hadamard Matrices, Orthogonal Designs And Clifford-Gastineau-Hills Algebras, Jennifer Seberry

Faculty of Engineering and Information Sciences - Papers: Part B

All rights reserved. Research into the construction of Hadamard matrices and orthogonal designs has led to deeper algebraic and combinatorial concepts. This paper surveys the place of amicability, repeat designs and the Clifford and Clifford-Gastineau-Hills algebras in laying the foundations for a Theory of Orthogonal Designs.


The Murray Darling Basin Plan Is Not Delivering - There's No More Time To Waste, Quentin Grafton, Darla Hatton Macdonald, David Paton, Graham P. Harris, Henning Bjornlund, Jeffery D. Connor, John Quiggin, John Williams, Lin Crase, Richard T. Kingsford, Sarah Ann Wheeler Jan 2018

The Murray Darling Basin Plan Is Not Delivering - There's No More Time To Waste, Quentin Grafton, Darla Hatton Macdonald, David Paton, Graham P. Harris, Henning Bjornlund, Jeffery D. Connor, John Quiggin, John Williams, Lin Crase, Richard T. Kingsford, Sarah Ann Wheeler

SMART Infrastructure Facility - Papers

More than five years after the Murray Darling Basin Plan was implemented, it's clear that it is not delivering on its key objectives. The Basin Plan, at its core, is about reducing the amount of water that can be extracted from its streams, rivers and aquifers. It includes an environmental water strategy to improve the conditions of the wetlands and rivers of the basin. The Productivity Commission will conduct a five-yearly inquiry into the effectiveness of the Basin Plan in 2018. It is high time to explain what is really going on in the Basin and water recovery. For ...


A Case Study Of Presplitting Blasting Parameters Of Hard And Massive Roof Based On The Interaction Between Support And Overlying Strata, Ningbo Zhang, Changyou Liu, Baobao Chen Jan 2018

A Case Study Of Presplitting Blasting Parameters Of Hard And Massive Roof Based On The Interaction Between Support And Overlying Strata, Ningbo Zhang, Changyou Liu, Baobao Chen

Faculty of Engineering and Information Sciences - Papers: Part B

Due to the existence of a hard and massive roof (HMR), severe ground pressure behaviors have been observed at the working face, resulting in safety issues and the degradation of production effectiveness. Based on the HMR conditions of the Datong Mining Area, the fracture-related instability of the HMR and its effects on the support selection were investigated by analyzing the interaction between support and overlying strata. Advancefixed-distance presplitting blasting (AFPB) technology was proposed to control the caving interval of HMR, and the influence of the controlled interval on the working load of supports was also analyzed. The working load of ...


Pairing-Dependent Superconductivity Gap And Nonholonomic Andreev Reflection In Weyl Semimetal/Weyl Superconductor Heterojunctions, Jun Fang, Wenye Duan, Junfeng Liu, C Zhang, Zhongshui Ma Jan 2018

Pairing-Dependent Superconductivity Gap And Nonholonomic Andreev Reflection In Weyl Semimetal/Weyl Superconductor Heterojunctions, Jun Fang, Wenye Duan, Junfeng Liu, C Zhang, Zhongshui Ma

Faculty of Engineering and Information Sciences - Papers: Part B

We study superconductivity states mediated by the BCS and Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairings in superconducting Weyl semimetals. It is found that a mixture of BCS and FFLO pairings results in a distinctive double-gap structure for superconducting states. With a heterojunction of a Weyl semimetal and a superconducting Weyl semimetal, we demonstrate the nonholonomic Andreev reflection and show that the intra- and internode Andreev reflections increase at the edges of the effective gap. The influence of interface potentials on the Andreev reflections is investigated. The conductance spectra arising from the mixed superconducting pairings is also analyzed.


Differential Gene Expression Analysis Tools Exhibit Substandard Performance For Long Non-Coding Rna-Sequencing Data, Alemu Assefa, Katrijn De Paepe, Celine Everaert, Pieter Mestdagh, Olivier Thas, Jo Vandesompele Jan 2018

Differential Gene Expression Analysis Tools Exhibit Substandard Performance For Long Non-Coding Rna-Sequencing Data, Alemu Assefa, Katrijn De Paepe, Celine Everaert, Pieter Mestdagh, Olivier Thas, Jo Vandesompele

Faculty of Engineering and Information Sciences - Papers: Part B

Background: Long non-coding RNAs (lncRNAs) are typically expressed at low levels and are inherently highly variable. This is a fundamental challenge for differential expression (DE) analysis. In this study, the performance of 25 pipelines for testing DE in RNA-seq data is comprehensively evaluated, with a particular focus on lncRNAs and low-abundance mRNAs. Fifteen performance metrics are used to evaluate DE tools and normalization methods using simulations and analyses of six diverse RNA-seq datasets.

Results: Gene expression data are simulated using non-parametric procedures in such a way that realistic levels of expression and variability are preserved in the simulated data. Throughout ...


Fundamental Understanding Of Diesel-Operated Man Riding Vehicle Dpm Dispersion - A Case Study, Ramakrishna Morla, Ajit R. Godbole, Shivakumar Karekal, Ram Madhab Bhattacharjee, Nasina Balasubrahmanyam Jan 2018

Fundamental Understanding Of Diesel-Operated Man Riding Vehicle Dpm Dispersion - A Case Study, Ramakrishna Morla, Ajit R. Godbole, Shivakumar Karekal, Ram Madhab Bhattacharjee, Nasina Balasubrahmanyam

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, an attempt has been made to model DPM flow patterns in the vicinity of man riding vehicle(s) operating in a coal mine environment. The DPM flow patterns are modelled using the techniques of computational fluid dynamics (CFD) and validated using field experimental measurements. The models show that if the vehicle is stationary, DPM particles are dispersed towards the center of gallery. Beyond 20 m downstream of the vehicle, the DPM particles occupy the entire cross-section of the roadway. If movement of the vehicle is considered, the miners may be exposed to a high concentration of DPM ...


The Charge Transport Mechanisms In Conducting Polymer Polypyrrole Films And Fibers, Reza Ghanbari, Shaban Reza Ghorbani, Hadi Arabi, Javad Foroughi Jan 2018

The Charge Transport Mechanisms In Conducting Polymer Polypyrrole Films And Fibers, Reza Ghanbari, Shaban Reza Ghorbani, Hadi Arabi, Javad Foroughi

Australian Institute for Innovative Materials - Papers

Smart materials based on inherently conducting polymers are of practical interest and extend the advantages of electromaterials from the nanoscale to macroscale applications. However understanding mechanisms of the their electrical properties are still remained challanging. Herein, we report the transport properties of chemically and electrochemically preapred conducting polymer polypyrrole films and fibers. Conduction mechanisms of the as-prepared polypyrrole (PPy) were investigated using their electrical properties as a function of temperature (7-300 K). The results of the PPy resistivity were evaluated using a linear combination of Mott's and Efros-Shklovskii's Variable- Range Hopping (Mott-VRH and ES-VRH) models. It was found ...


Enhancement Of Thermoelectric Figure Of Merit By The Insertion Of Multi-Walled Carbon Nanotubes In Α-Mgagsb, Jingdan Lei, De Zhang, Weibao Guan, Zheng Ma, Zhenxiang Cheng, Chao Wang, Yuanxu Wang Jan 2018

Enhancement Of Thermoelectric Figure Of Merit By The Insertion Of Multi-Walled Carbon Nanotubes In Α-Mgagsb, Jingdan Lei, De Zhang, Weibao Guan, Zheng Ma, Zhenxiang Cheng, Chao Wang, Yuanxu Wang

Australian Institute for Innovative Materials - Papers

Hybrid materials provide an efficient alternative route on improving the thermoelectric performance compared with doping elements. Especially, the insertion of carbon nanotubes plays an effective role in modulating the electrical transport properties and phonon scattering simultaneously. We fabricated a multi-walled carbon nanotube (MWCNTs) doped α-MgAgSb-based hybrid material and researched its thermoelectric properties in detail. The introduced MWCNTs enhanced carrier transport due to the metallic character of MWCNTs and phonon dispersion by the additional interfaces of insertions. The results showed that the electrical conductivity in α-MgAgSb/CNTs was remarkably enhanced especially at MgAg0.97Sb0.99/0.15 wt. % CNTs boosting to ...


Energy Of Dendritic Avalanches In Thin-Film Superconductors, T Qureishy, J I. Vestgarden, A J. Qviller, A S. Fjellvag, J M. Meckbach, A Torgovkin, Tom H. Johansen, K Ilin, M Siegel, I J. Maasilta, Pavlo Mikheenko Jan 2018

Energy Of Dendritic Avalanches In Thin-Film Superconductors, T Qureishy, J I. Vestgarden, A J. Qviller, A S. Fjellvag, J M. Meckbach, A Torgovkin, Tom H. Johansen, K Ilin, M Siegel, I J. Maasilta, Pavlo Mikheenko

Australian Institute for Innovative Materials - Papers

A method for calculating stored magnetic energy in a thin superconducting film based on quantitative magneto-optical imaging is developed. Energy and magnetic moment are determined with these calculations for full hysteresis loops in a thin film of the superconductor NbN. Huge losses in energy are observed when dendritic avalanches occur. Magnetic energy, magnetic moment, sheet current and magnetic flux distributions, all extracted from the same calibrated magneto-optical images, are analyzed and discussed. Dissipated energy and the loss in moment when dendritic avalanches occur are related to each other. Calculating these losses for specific spatially-resolved flux avalanches is a great advantage ...


Progress And Future Perspectives On Li(Na)-Co2 Batteries, Fengshi Cai, Zhe Hu, Shulei Chou Jan 2018

Progress And Future Perspectives On Li(Na)-Co2 Batteries, Fengshi Cai, Zhe Hu, Shulei Chou

Australian Institute for Innovative Materials - Papers

Li(Na)-CO2 batteries are attracting significant research attention due to contemporary energy and environmental issues. Li(Na)-CO2 batteries make possible the utilization of CO2 and open up a new avenue for energy conver-sion and storage. Research on this system is currently in its infancy, and its development is still faced with many challenges in terms of high charge potential, weak rate capability, and poor cyclability. Moreover, the reaction mechanism in the battery is still unclear and hard to determine, due to the generation of carbon along with metal carbonates on the cathode. In this review, the authors present ...


Review Of Electrolytes In Nonaqueous Lithium-Oxygen Batteries, Haipeng Guo, Wenbin Luo, Jun Chen, Shulei Chou, Hua-Kun Liu, Jiazhao Wang Jan 2018

Review Of Electrolytes In Nonaqueous Lithium-Oxygen Batteries, Haipeng Guo, Wenbin Luo, Jun Chen, Shulei Chou, Hua-Kun Liu, Jiazhao Wang

Australian Institute for Innovative Materials - Papers

Based on an inexhaustible and ubiquitous source of oxygen, the lithium-oxygen batteries are currently the subject of much scientific investigation because of their potential for extremely high energy density. The electrocatalytic materials for them have been extensively researched during the past decade. Even though they are a key component in the lithium-oxygen batteries, however, the study of electrolytes is still in its primary stage. Electrolytes have an important influence on the electrochemical performance of lithium-oxygen batteries, especially on their cycling stability and rate capacity. Therefore, it is important to select an ideal electrolyte with excellent stability against attack by reaction ...