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Articles 1591 - 1620 of 14367

Full-Text Articles in Social and Behavioral Sciences

Modelling Sustainable Supply Networks With Adaptive Agents, Subodha Dharmapriya, Senevi Kiridena, Nagesh Shukla Jan 2018

Modelling Sustainable Supply Networks With Adaptive Agents, Subodha Dharmapriya, Senevi Kiridena, Nagesh Shukla

Faculty of Engineering and Information Sciences - Papers: Part B

This paper proposes a multi-agent modelling approach that supports supply network configuration decisions towards sustaining operations excellence in terms of economic, business continuity and environmental performance. Two types of agents are employed, namely, physical agents to represent supply entities and auxiliary agents to deal with supply network configuration decisions. While using the evolutionary algorithm, Non-dominated Sorting Genetic Algorithm-II to optimize both cost and lead time at the supply network level, agents are modelled with an architecture which consists of decision-making, learning and communication modules. The physical agents make decisions considering varying situations to suit specific product-market profiles thereby generating alternative …

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Micro Forming Of Metallic Composites, Hang Yin, Zhengyi Jiang, Haibo Xie, Fanghui Jia, Xiaogang Wang, Cunlong Zhou Jan 2018

Micro Forming Of Metallic Composites, Hang Yin, Zhengyi Jiang, Haibo Xie, Fanghui Jia, Xiaogang Wang, Cunlong Zhou

Faculty of Engineering and Information Sciences - Papers: Part B

As the popularisation of electronical devices, the development of micro systems has attracted the attention of the researchers. Therefore, it is crucial to identify the effects of relevant parameters in micro forming process. This study mainly focuses on the impact of holding time in heat treatment process on the properties of Cu-Al-Cu laminate composite materials during micro deep drawing process. The results demonstrate that the Cu-Al-Cu laminate composite material that experiences 10-minute holding time can obtain better properties. Furthermore, a simulation model of the micro forming process is developed and the simulation results are compared with the experimental ones.

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Cloud Computing And E-Commerce Adoption In Indonesia: Mind The Gaps, Fahrizal Budiono, S K. Lau, William J. Tibben Jan 2018

Cloud Computing And E-Commerce Adoption In Indonesia: Mind The Gaps, Fahrizal Budiono, S K. Lau, William J. Tibben

Faculty of Engineering and Information Sciences - Papers: Part B

This study examines the e-commerce road map of Indonesia with its implementation and project plan to promote national development in Indonesia. The objective is to compare the eight aspects of the road map to academic literature that focuses on rural development strategy from the perspective of cloud computing and e-commerce adoption. The paper identifies areas of similarity and gaps in the road map to enable future research to best promote rural area development in Indonesia and reduce the digital divide.

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Effect Of Joint Geometrical Parameters On Hydraulic Fracture Network Propagation In Naturally Jointed Shale Reservoirs, Zhaohui Chong, Qiangling Yao, Xuehua Li Jan 2018

Effect Of Joint Geometrical Parameters On Hydraulic Fracture Network Propagation In Naturally Jointed Shale Reservoirs, Zhaohui Chong, Qiangling Yao, Xuehua Li

Faculty of Engineering and Information Sciences - Papers: Part B

The presence of a significant amount of discontinuous joints results in the inhomogeneous nature of the shale reservoirs. The geometrical parameters of these joints exert effects on the propagation of a hydraulic fracture network in the hydraulic fracturing process. Therefore, mechanisms of fluid injection-induced fracture initiation and propagation in jointed reservoirs should be well understood to unleash the full potential of hydraulic fracturing. In this paper, a coupled hydromechanical model based on the discrete element method is developed to explore the effect of the geometrical parameters of the joints on the breakdown pressure, the number and proportion of hydraulic fractures, …

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Independently Recurrent Neural Network (Indrnn): Building A Longer And Deeper Rnn, Shuai Li, Wanqing Li, Christopher David Cook, Ce Zhu, Yanbo Gao Jan 2018

Independently Recurrent Neural Network (Indrnn): Building A Longer And Deeper Rnn, Shuai Li, Wanqing Li, Christopher David Cook, Ce Zhu, Yanbo Gao

Faculty of Engineering and Information Sciences - Papers: Part B

Recurrent neural networks (RNNs) have been widely used for processing sequential data. However, RNNs are commonly difficult to train due to the well-known gradient vanishing and exploding problems and hard to learn long-term patterns. Long short-term memory (LSTM) and gated recurrent unit (GRU) were developed to address these problems, but the use of hyperbolic tangent and the sigmoid action functions results in gradient decay over layers. Consequently, construction of an efficiently trainable deep network is challenging. In addition, all the neurons in an RNN layer are entangled together and their behaviour is hard to interpret. To address these problems, a …

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Supporting Physics Teachers To Deliver The New High School Certificate Syllabus: What Are The Priorities?, Lorna E. Jarrett, Helen Georgiou, Michael L. F Lerch, George J. Takacs, William J. Zealey Jan 2018

Supporting Physics Teachers To Deliver The New High School Certificate Syllabus: What Are The Priorities?, Lorna E. Jarrett, Helen Georgiou, Michael L. F Lerch, George J. Takacs, William J. Zealey

Faculty of Engineering and Information Sciences - Papers: Part B

For the first time since 2000, the New South Wales High School Certificate (HSC) school-leavers' Physics syllabus has been updated. Topics not taught in schools since 2000 have been reintroduced, the number of mandated equations has more than doubled, and students must now do 15 hours of individual or group investigations in both Years 11 and 12. The Vniversity of Wollongong (UOW) intends to support teachers in our local area by providing outreach and professional learning activities for teachers and students. To determine teachers' priorities, we invited teachers to complete a short online survey. Respondents stated that they were very …

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Total Electron-Scattering Cross Sections From Pyridine Molecules In The Energy Range 1-200 Ev, A I. Lozano, J Jimenez, Francisco Blanco, Gustavo Garcia Jan 2018

Total Electron-Scattering Cross Sections From Pyridine Molecules In The Energy Range 1-200 Ev, A I. Lozano, J Jimenez, Francisco Blanco, Gustavo Garcia

Faculty of Engineering and Information Sciences - Papers: Part B

We report on total electron-scattering cross sections from pyridine as measured with a magnetically confinedelectron-beam system for impact energies ranging from 1 to 200 eV, including measurements for energies below10 eV. Reasonable agreement with previous measurements for energies above 10 eV has been found. Systematicerrors arising from elastically and rotationally scattered electrons into the detector acceptance angle have beenevaluated. Results are compared with available calculation both for the 10-200 eV and below 10 eV energy ranges.The evaluated data provided in this study will facilitate electron transport modeling in biologically relevant media

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Comparison Of Four Dimensional Computed Tomography And Magnetic Resonance Imaging In Abdominal Radiotherapy Planning, A Oar, Gary P. Liney, Robba Rai, Shrikant Deshpande, Li Pan, Meredith Johnston, Michael G. Jameson, Shivani Kumar, Mark T. Lee Jan 2018

Comparison Of Four Dimensional Computed Tomography And Magnetic Resonance Imaging In Abdominal Radiotherapy Planning, A Oar, Gary P. Liney, Robba Rai, Shrikant Deshpande, Li Pan, Meredith Johnston, Michael G. Jameson, Shivani Kumar, Mark T. Lee

Faculty of Engineering and Information Sciences - Papers: Part B

Background and Purpose: Four-dimensional (4D) computed tomography (CT) is widely used in radiotherapy (RT) planning and remains the current standard for motion evaluation. We assess a 4D magnetic resonance imaging (MRI) sequence in terms of motion and image quality in a phantom, healthy volunteers and patients undergoing RT. Materials and Methods: The 4D-MRI sequence is a prototype T1-weighted 3D gradient echo with radial acquisition with self-gating. The accuracy of the 4D-MRI respiratory sorting based method was assessed using a MRICT compatible respiratory simulation phantom. In volunteers, abdominal viscera were evaluated for artefact, noise, structure delineation and overall image quality using …

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Revisiting The Effects Of Supply Voltage Unbalance On The Losses Of Three Phase Induction Motors, Pathum Maduranga Sudasinghe Sudasinghege, Sarath Perera, Philip A. Commins, Jeff Moscorp, Upuli Jayatunga, Prasad Wadduwage Jan 2018

Revisiting The Effects Of Supply Voltage Unbalance On The Losses Of Three Phase Induction Motors, Pathum Maduranga Sudasinghe Sudasinghege, Sarath Perera, Philip A. Commins, Jeff Moscorp, Upuli Jayatunga, Prasad Wadduwage

Faculty of Engineering and Information Sciences - Papers: Part B

The impact of supply voltage unbalance (VU) on three-phase induction motors (IMs) is well known in terms of extra losses and associated derating to ensure that the motors do not prematurely fail. Theoretical studies, experimental results and standards exist in this regard. However, the approaches taken in the past are not seen be exhaustive now considering the modern tools such as Finite Element Modelling (FEM) software. Also, the relevant documentation available to-date on the subject does not cover the level of variability in the outcomes such as extra losses that can arise when an IM is subjected to the same …

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Thread Effect On The Initial Stiffness Of Bolted Connections, Aziz Ahmed, Lip H. Teh Jan 2018

Thread Effect On The Initial Stiffness Of Bolted Connections, Aziz Ahmed, Lip H. Teh

Faculty of Engineering and Information Sciences - Papers: Part B

This paper investigates the effect of bolt threads on the initial stiffness of double-shear bolted connections through experimental tests and numerical analyses. Eight specimens composed of 4.7 mm and 8 mm thick structural steel plates with a bolt diameter of 20 mm having varying end distances are studied. The present finite element analysis demonstrates that, as the threads cut into the connected plate, they reduce the initial stiffness of the bolted connection, which is the reason why many finite element models in the literature could not reasonably match the load-displacement curves of tested bolted connection specimens. Comparisons against alternative models …

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A Dual Fracture Transition Mechanism In Nanotwinned Ni, Linqing Pei, Cheng Lu, Qian Tang, Anh Kiet Tieu, Xing Zhao, Liang Zhang Jan 2018

A Dual Fracture Transition Mechanism In Nanotwinned Ni, Linqing Pei, Cheng Lu, Qian Tang, Anh Kiet Tieu, Xing Zhao, Liang Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

Molecular dynamic simulation was used to study the brittle versus ductile fracture behaviour in nanotwinned Ni at various temperatures. The simulation results show that three temperature regimes correspond to three different fracture behaviours: brittle, brittle-to-ductile transition and ductile. A dual fracture transition mechanism in nanotwinned Ni within a small temperature interval was observed: (1) local phase transformation and (2) ledge formation ahead of the crack tip induced a sharp fracture transition from brittle mode to ductile mode. Our simulation results reveal that the very rare double fracture transition mechanisms could be transformed quickly in nanotwinned Ni within a narrow temperature …

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Dynamic Interaction Between Grain Boundary And Stacking Fault Tetrahedron, Liang Zhang, Cheng Lu, Anh Kiet Tieu, Yasushi Shibuta Jan 2018

Dynamic Interaction Between Grain Boundary And Stacking Fault Tetrahedron, Liang Zhang, Cheng Lu, Anh Kiet Tieu, Yasushi Shibuta

Faculty of Engineering and Information Sciences - Papers: Part B

We utilize molecular dynamics simulations to investigate the dynamic interaction between the grain boundary (GB) and the stacking fault tetrahedron (SFT) in bicrystal copper. The grain boundary can migrate itself under the shear strain and can serve as a sink to remove SFT. The sink efficiency of grain boundaries is sensitive to their structural characteristics. The high-angle GBs can show a great ability to remove SFT even at an extreme low temperature, while the increase of temperature can facilitate the annihilation of SFT at the low-angle GBs. This study reveals a new possible GB-mediated damage healing mechanism of irradiated materials.

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Mechanical Properties And Microstructure Of A Ti-6al-4v Alloy Subjected To Cold Rolling, Asymmetric Rolling And Asymmetric Cryorolling, Hai Liang Yu, Ming Yan, Jintao Li, Ajit R. Godbole, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Charlie Kong Jan 2018

Mechanical Properties And Microstructure Of A Ti-6al-4v Alloy Subjected To Cold Rolling, Asymmetric Rolling And Asymmetric Cryorolling, Hai Liang Yu, Ming Yan, Jintao Li, Ajit R. Godbole, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Charlie Kong

Faculty of Engineering and Information Sciences - Papers: Part B

The mechanical properties of the Ti-6Al-4V alloy are significantly determined by the process used for manufacture. In this study, the mechanical properties of the Ti-6Al-4V alloy manufactured using cold rolling, asymmetric rolling and asymmetric cryorolling were characterized by subjecting it to the tensile test and the microhardness test. The evolution in the microstructure was studied using scanning electron microscopy, transmission electron microscopy as well as energy dispersive X-ray spectrometry. Results show that the Ti-6Al-4V alloy sheets subjected to asymmetrical cryorolling with low rolling speed ratio between the upper and lower rolls have the highest tensile strength and microhardness. The tensile …

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Integrating Photovoltaic Thermal Collectors And Thermal Energy Storage Systems Using Phase Change Materials With Rotary Desiccant Cooling Systems, Haoshan Ren, Zhenjun Ma, Wenye Lin, Wenke Fan, Weihua Li Jan 2018

Integrating Photovoltaic Thermal Collectors And Thermal Energy Storage Systems Using Phase Change Materials With Rotary Desiccant Cooling Systems, Haoshan Ren, Zhenjun Ma, Wenye Lin, Wenke Fan, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents a feasibility investigation of integrating a hybrid photovoltaic thermal collector-solar air heater (PVT-SAH) and an air-based thermal energy storage (TES) system using phase change materials (PCMs) with rotary desiccant cooling systems for residential applications. The PVT-SAH is used to generate both electricity and thermal energy, while the TES unit is used to solve the mismatch between energy demand for desiccant wheel regeneration and thermal energy generation from the PVT-SAH. A near-optimal design of the proposed system is first identified using the response surface method. The feasibility is then examined using three performance indicators, including Solar Thermal Contribution …

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Legged Motion Planning In Complex Three-Dimensional Environments, Andrew Short, Tirthankar Bandyopadhyay Jan 2018

Legged Motion Planning In Complex Three-Dimensional Environments, Andrew Short, Tirthankar Bandyopadhyay

Faculty of Engineering and Information Sciences - Papers: Part B

While legged robots are well suited to navigating complex three-dimensional (3-D) environments, their practical applicability is still hampered by the time taken to plan manoeuvres to traverse these challenging environments. We present contact dynamic roadmaps (CDRM), which extend dynamic roadmaps with contact information. The CDRM is precomputed offline to generate a discretized mapping from each leg's workspace to its configuration space, and then adapted online to the environment to rapidly identify collision-free foothold positions. The concept behind this is to perform the expensive foothold candidate generation and collision checking phases offline and store the data for use in the online …

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Effect Of Hydraulic Retention Time On The Performance Of A Hybrid Moving Bed Biofilm Reactor-Membrane Bioreactor System For Micropollutants Removal From Municipal Wastewater, Qi Jiang, Hao H. Ngo, Long D. Nghiem, Faisal I. Hai, William E. Price, Jian Zhang, Shuang Liang, L J. Deng, Wenshan Guo Jan 2018

Effect Of Hydraulic Retention Time On The Performance Of A Hybrid Moving Bed Biofilm Reactor-Membrane Bioreactor System For Micropollutants Removal From Municipal Wastewater, Qi Jiang, Hao H. Ngo, Long D. Nghiem, Faisal I. Hai, William E. Price, Jian Zhang, Shuang Liang, L J. Deng, Wenshan Guo

Faculty of Engineering and Information Sciences - Papers: Part B

This study evaluated micropollutants removal and membrane fouling behaviour of a hybrid moving bed biofilm reactor-membrane bioreactor (MBBR-MBR) system at four different hydraulic retention times (HRTs) (24, 18, 12 and 6 h). The results revealed that HRT of 18 h was the optimal condition regarding the removal of most selected micropollutants. As the primary removal mechanism in the hybrid system was biodegradation, the attached growth pattern was desirable for enriching slow growing bacteria and developing a diversity of biocoenosis. Thus, the efficient removal of micropollutants was obtained. In terms of membrane fouling propensity analysis, a longer HRT (e.g. HRTs of …

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Application Of Solar Energy In Water Treatment Processes: A Review, Ying Zhang, Muttucumaru Sivakumar, Shu-Qing Yang, Keith Enever, Mohammad Ramezanianpour Jan 2018

Application Of Solar Energy In Water Treatment Processes: A Review, Ying Zhang, Muttucumaru Sivakumar, Shu-Qing Yang, Keith Enever, Mohammad Ramezanianpour

Faculty of Engineering and Information Sciences - Papers: Part B

The utilization of solar energy to drive water treatment processes is a potential sustainable solution to the world's water scarcity issue. In recent years, significant efforts have been devoted to developing and testing innovative solar based water treatment technologies, which are comprehensively reviewed in this paper. Recent developments and applications of seven major solar desalination technologies, solar photocatalysis process and solar disinfection are investigated. Potential integration of solar technologies and desalination processes are summarized. By collecting and analysing performance data from recent studies, the status of productivity, energy consumption and water production costs of different technologies is critically reviewed. The …

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Understanding Reaction Sequences And Mechanisms During Synthesis Of Nanocrystalline Ti2n And Tin Via Magnetically Controlled Ball Milling Of Ti In Nitrogen, Erhuvwu J. Oghenevweta, David Wexler, Andrzej Calka Jan 2018

Understanding Reaction Sequences And Mechanisms During Synthesis Of Nanocrystalline Ti2n And Tin Via Magnetically Controlled Ball Milling Of Ti In Nitrogen, Erhuvwu J. Oghenevweta, David Wexler, Andrzej Calka

Faculty of Engineering and Information Sciences - Papers: Part B

Mechanically induced reactive synthesis of TiN via magnetically controlled ball milling of titanium under nitrogen gas was investigated using X-ray diffraction, advanced electron microscopy and Raman spectroscopy. Ball milling of titanium powder with nitrogen gas was performed in Uni-Ball-Mill, with external temperature of the vial and initial pressures of the nitrogen gas monitored, while the milled samples were taken out periodically, both before and after detection of an exothermic ignition point. Before ignition, nitrogen-enriched Ti, small proportions of TiN and very minor amounts of Ti2N are formed, in addition to the heavily deformed Ti. Raman spectroscopy revealed the …

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Effect Of Tempering On Microstructure And Mechanical Properties Of 3mn-Si-Ni Martensitic Steel, Yanjun Zhao, Xue-Ping Ren, Zhiliu Hu, Zhiping Xiong, Jian-Min Zeng, Baoyu Hou Jan 2018

Effect Of Tempering On Microstructure And Mechanical Properties Of 3mn-Si-Ni Martensitic Steel, Yanjun Zhao, Xue-Ping Ren, Zhiliu Hu, Zhiping Xiong, Jian-Min Zeng, Baoyu Hou

Faculty of Engineering and Information Sciences - Papers: Part B

The dependence of microstructures and mechanical properties on tempering temperature (from 180 to 650 °C) in a designed 3Mn-Si-Ni martensitic steel was systematically analyzed. Microstructure was characterized using scanning and transmission electron microscopy; mechanical properties were measured using uniaxial tensile test and Charpy V-notch impact test. After tempering at different temperatures, recovery, partial recrystallization, carbides precipitation and decomposition of residual austenite were observed. After tempering at 230 °C, an excellent combination of strength (1550 MPa) and toughness (91.5 J) was achieved, due to high dislocation density and ε-carbides precipitation. However, with an increase in tempering temperature from 320 to 550 …

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Uniqueness Theorems For Topological Higher-Rank Graph C*-Algebras, Jean Renault, Aidan Sims, Dana P. Williams, Trent M. Yeend Jan 2018

Uniqueness Theorems For Topological Higher-Rank Graph C*-Algebras, Jean Renault, Aidan Sims, Dana P. Williams, Trent M. Yeend

Faculty of Engineering and Information Sciences - Papers: Part B

We consider the boundary-path groupoids of topological higher-rank graphs. We show that all such groupoids are topologically amenable. We deduce that the $ C^*$-algebras of topological higher-rank graphs are nuclear and prove versions of the gauge-invariant uniqueness theorem and the Cuntz-Krieger uniqueness theorem. We then provide a necessary and sufficient condition for simplicity of a topological higher-rank graph $ C^*$-algebra, and a condition under which it is also purely infinite.

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Constant-Size Ciphertexts In Threshold Attribute-Based Encryption Without Dummy Attributes, Willy Susilo, Guomin Yang, Fuchun Guo, Qiong Huang Jan 2018

Constant-Size Ciphertexts In Threshold Attribute-Based Encryption Without Dummy Attributes, Willy Susilo, Guomin Yang, Fuchun Guo, Qiong Huang

Faculty of Engineering and Information Sciences - Papers: Part B

Attribute-based encryption (ABE) is an augmentation of public key encryption that allows users to encrypt and decrypt messages based on users’ attributes. In a ( t, s ) threshold ABE, users who can decrypt a ciphertext must hold at least t attributes among the s attributes specified by the encryptor. At PKC 2010, Herranz, Laguillaumie and Ràfols proposed the first threshold ABE with constant-size ciphertexts. In order to ensure the encryptor can flexibly select the attribute set and a threshold value, they use dummy attributes to satisfy the decryption requirement. The advantage of their scheme is that any addition or …

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Data-Centric Intelligent Computing, Jun Shen, Chih-Cheng Hung, Ghassan Beydoun, Yan Li, William Guo Jan 2018

Data-Centric Intelligent Computing, Jun Shen, Chih-Cheng Hung, Ghassan Beydoun, Yan Li, William Guo

Faculty of Engineering and Information Sciences - Papers: Part B

In the age of Big Data and Internet of Things the integration of traditional and contemporary intelligent computing techniques continues to play an increasingly vital role in data analysis, real-time control and operation, decision making, and evaluation and forecasting. Many intelligent techniques, such as fuzzy logic and genetic algorithms, were initially proposed to deal with a certain type of datasets, whose success then led to the generalization of many algorithms that can deal with common types of datasets. With the rapid advancement in pervasive computing and integration with big datasets, digital datasets in different formats have been exponentially collected from …

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Metamorphic Testing: A Review Of Challenges And Opportunities, Tsong Yueh Chen, Fei-Ching Kuo, Huai Liu, Pak-Lok Poon, Dave Towey, T. H. Tse, Zhi Quan Zhou Jan 2018

Metamorphic Testing: A Review Of Challenges And Opportunities, Tsong Yueh Chen, Fei-Ching Kuo, Huai Liu, Pak-Lok Poon, Dave Towey, T. H. Tse, Zhi Quan Zhou

Faculty of Engineering and Information Sciences - Papers: Part B

Metamorphic testing is an approach to both test case generation and test result verification. A central element is a set of metamorphic relations, which are necessary properties of the target function or algorithm in relation to multiple inputs and their expected outputs. Since its first publication, we have witnessed a rapidly increasing body of work examining metamorphic testing from various perspectives, including metamorphic relation identification, test case generation, integration with other software engineering techniques, and the validation and evaluation of software systems. In this article, we review the current research of metamorphic testing and discuss the challenges yet to be …

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Trace Organic Contaminant Rejection By Aquaporin Forward Osmosis Membrane: Transport Mechanisms And Membrane Stability, Ming Xie, Wenhai Luo, Hao Guo, Long D. Nghiem, Chuyang Y. Tang, Stephen Gray Jan 2018

Trace Organic Contaminant Rejection By Aquaporin Forward Osmosis Membrane: Transport Mechanisms And Membrane Stability, Ming Xie, Wenhai Luo, Hao Guo, Long D. Nghiem, Chuyang Y. Tang, Stephen Gray

Faculty of Engineering and Information Sciences - Papers: Part B

We investigated transport mechanisms of trace organic contaminants (TrOCs) through aquaporin thin-film composite forward osmosis (FO) membrane, and membrane stability under extreme conditions with respect to TrOC rejections. Morphology and surface chemistry of the aquaporin membrane were characterised to identify the incorporation of aquaporin vesicles into membrane active layer. Pore hindrance model was used to estimate aquaporin membrane pore size as well as to describe TrOC transport. TrOC transport mechanisms were revealed by varying concentration and type of draw solutions. Experimental results showed that mechanism of TrOC transport through aquaporin-embedded FO membrane was dominated by solution-diffusion mechanism. Non-ionic TrOC rejections …

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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 …

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Inception Of Geohydraulic Failures In Granular Soils - An Experimental And Theoretical Treatment, Buddhima Indraratna, Jahanzaib Israr, M Li Jan 2018

Inception Of Geohydraulic Failures In Granular Soils - An Experimental And Theoretical Treatment, Buddhima Indraratna, Jahanzaib Israr, M Li

Faculty of Engineering and Information Sciences - Papers: Part B

This paper outlines an experimental investigation into seepage-induced failures in soils subjected to static and cyclic loading. Internally stable, marginal and unstable soils are characterised by heave, composite heave-piping and suffusion that develops immediately upon instability. In this study, the stable specimens exhibited heave at larger hydraulic gradients than the unstable specimens failing by suffusion at relatively smaller hydraulic gradients. Under no external load (i.e. self-weight only), the relative density (Rd) and particle size distribution (PSD) in tandem controlled the internal stability of soils, although the effective stress magnitude (σ′vt) also had a role to …

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Thin Silicon Microdosimeter Utilizing 3d Mems Fabrication Technology: Charge Collection Study And Its Application In Mixed Radiation Fields, Linh T. Tran, Lachlan Chartier, Dale A. Prokopovich, David Bolst, Marco Povoli, Anand Summanwar, Angela Kok, Alex Pogossov, Marco Petasecca, Susanna Guatelli, Mark I. Reinhard, Michael L. F Lerch, Mitchell John Bromley Nancarrow, Naruhiro Matsufuji, Michael A. Jackson, Anatoly B. Rosenfeld Jan 2018

Thin Silicon Microdosimeter Utilizing 3d Mems Fabrication Technology: Charge Collection Study And Its Application In Mixed Radiation Fields, Linh T. Tran, Lachlan Chartier, Dale A. Prokopovich, David Bolst, Marco Povoli, Anand Summanwar, Angela Kok, Alex Pogossov, Marco Petasecca, Susanna Guatelli, Mark I. Reinhard, Michael L. F Lerch, Mitchell John Bromley Nancarrow, Naruhiro Matsufuji, Michael A. Jackson, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

New 10-μm-thick silicon microdosimeters utilizing 3-D technology have been developed and investigated in this paper. The TCAD simulations were carried out to understand the electrical properties of the microdosimeters' design. A charge collection study of the devices was performed using 5.5-MeV He2+ ions which were raster scanned over the surface of the detectors and the charge collection median energy maps were obtained and the detection yield was also evaluated. The devices were tested in a 290 MeV/u carbon ion beam at the Heavy Ion Medical Accelerator in Chiba (HIMAC) in Japan. Based on the microdosimetric measurements, the quality factor …

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Investigation On The Behaviour Of Partial Wrapping In Comparison With Full Wrapping Of Square Rc Columns Under Different Loading Conditions, Anh Duc Mai, M Neaz Sheikh, Muhammad N. S Hadi Jan 2018

Investigation On The Behaviour Of Partial Wrapping In Comparison With Full Wrapping Of Square Rc Columns Under Different Loading Conditions, Anh Duc Mai, M Neaz Sheikh, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

This study investigates the behaviour of square reinforced concrete (RC) columns partially and fully wrapped with CFRP under different loading conditions. The experimental results of twelve specimens with 150 mm x 150 mm cross-section and 800 mm height tested under concentric axial load, eccentric axial loads and four-point bending are presented in this study. The experimental results showed that partial and full wrapping increased the strength and ductility of square RC column specimens. The increase in the strength and ductility of fully wrapped square RC column specimens was higher than the increase in the strength and ductility of partially wrapped …

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Comparative Effect Of Mo And Cr On Microstructure And Mechanical Properties In Nbv-Microalloyed Bainitic Steels, Andrii Kostryzhev, Navjeet Singh, Liang Chen, Chris R. Killmore, Elena V. Pereloma Jan 2018

Comparative Effect Of Mo And Cr On Microstructure And Mechanical Properties In Nbv-Microalloyed Bainitic Steels, Andrii Kostryzhev, Navjeet Singh, Liang Chen, Chris R. Killmore, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part B

Steel product markets require the rolled stock with further increasing mechanical properties and simultaneously decreasing price. The steel cost can be reduced via decreasing the microalloying elements contents, although this decrease may undermine the mechanical properties. Multi-element microalloying with minor additions is the route to optimise steel composition and keep the properties high. However, this requires deep understanding of mutual effects of elements on each other's performance with respect to the development of microstructure and mechanical properties. This knowledge is insufficient at the moment. In the present work we investigate the microstructure and mechanical properties of bainitic steels microalloyed with …

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The Fate Of Trace Organic Contaminants During Anaerobic Digestion Of Primary Sludge: A Pilot Scale Study, Hop V. Phan, John Wickham, Sihuang Xie, James A. Mcdonald, Stuart J. Khan, Hao H. Ngo, Wenshan Guo, Long D. Nghiem Jan 2018

The Fate Of Trace Organic Contaminants During Anaerobic Digestion Of Primary Sludge: A Pilot Scale Study, Hop V. Phan, John Wickham, Sihuang Xie, James A. Mcdonald, Stuart J. Khan, Hao H. Ngo, Wenshan Guo, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part B

A pilot-scale study was conducted to investigate the fate of trace organic contaminants (TrOCs) during anaerobic digestion of primary sludge. Of the 44 TrOCs monitored, 24 were detected in all primary sludge samples. Phase distribution of TrOCs was correlated well with their hydrophobicity ( > 67% mass in the solid phase when LogD > 1.5). The pilot-scale anaerobic digester achieved a steady performance with a specific methane yield of 0.39-0.92 L/gVSremoved and methane composition of 63-65% despite considerable variation in the primary sludge. The fate of TrOCs in the aqueous and solid phases was governed by their physicochemical properties. Biotransformation was …

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