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Articles 25411 - 25440 of 31916
Full-Text Articles in Social and Behavioral Sciences
Prospects For Protecting Business Microdata When Releasing Population Totals Via A Remote Server, James O. Chipperfield, John Newman, Gwenda Thompson, Yue Ma, Yan-Xia Lin
Prospects For Protecting Business Microdata When Releasing Population Totals Via A Remote Server, James O. Chipperfield, John Newman, Gwenda Thompson, Yue Ma, Yan-Xia Lin
Faculty of Engineering and Information Sciences - Papers: Part B
Many statistical agencies face the challenge of maintaining the confidentiality of respondents while providing as much analytical value as possible from their data. Datasets relating to businesses present particular difficulties because they are likely to contain information about large enterprises that dominate industries and may be more easily identified. Agencies therefore tend to take a cautious approach to releasing business data (e.g., trusted access, remote access and synthetic data). The Australian Bureau of Statistics has developed a remote server, called TableBuilder, which has the capability to allow users to specify and request tables created from business microdata. The tables are …
Alternative Pricing Methods For Shout Call Options, Joanna M. Goard
Alternative Pricing Methods For Shout Call Options, Joanna M. Goard
Faculty of Engineering and Information Sciences - Papers: Part B
Shout call options are exotic options that give the investor the ability to 'shout' during the life of the option, thus locking in a profit and resetting the strike price to the prevailing spot price. We look at two approaches to value such options. The first approach makes use of canonical variables of the classical heat equation and results in a series solution. In the second approach an integral formulation is used, which can be more amenable to pricing when there is more than one 'shout' allowed.
Prediction Of Blast Furnace Hearth Condition: Part I - A Steady State Simulation Of Hearth Condition During Normal Operation, Xue Feng Dong, Paul Zulli
Prediction Of Blast Furnace Hearth Condition: Part I - A Steady State Simulation Of Hearth Condition During Normal Operation, Xue Feng Dong, Paul Zulli
Faculty of Engineering and Information Sciences - Papers: Part B
A coupled flow and refractory model (CFRM) has been upgraded to assist engineers in understanding and interpreting the measured refractory temperature distributions in the hearth of a blast furnace hearth. CFRM describes the liquid flow distribution and heat transfer in the hearth, allowing various scenarios to be simulated involving coke bed properties, extent of hearth refractory wear, etc. The model was validated through comparison between measured refractory data and corresponding model predictions for the early stages of the current BlueScope's No. 5 Blast Furnace campaign. For the current campaign, the actual range in measured pad temperature fluctuation over a short …
Prediction Of Blast Furnace Hearth Condition: Part Ii - A Transient State Simulation Of Hearth Condition During Blast Furnace Shutdown, Xue Feng Dong, Paul Zulli, Mark Biasutti
Prediction Of Blast Furnace Hearth Condition: Part Ii - A Transient State Simulation Of Hearth Condition During Blast Furnace Shutdown, Xue Feng Dong, Paul Zulli, Mark Biasutti
Faculty of Engineering and Information Sciences - Papers: Part B
The extent of hearth cooling is critically important in determining the feasible duration of an extended blast furnace maintenance shutdown. Based on a fixed domain method, a transient numerical model has been developed which considers the effect of solidification enthalpy of liquid iron in a coke-free bath, enabling the progress of hearth cooling to be monitored. The model was initially verified by comparing calculations with actual refractory temperatures during shutdowns of shorter duration (typically 1-2 days) at BlueScope's No. 5 Blast Furnace. It was then applied to estimate the hearth condition during an extended shutdown period (typically, 5-6 days). The …
Defect Detection For Patterned Fabric Images Based On Ghog And Low-Rank Decomposition, Chunlei Li, Guangshuai Gao, Zhoufeng Liu, Di Huang, Jiangtao Xi
Defect Detection For Patterned Fabric Images Based On Ghog And Low-Rank Decomposition, Chunlei Li, Guangshuai Gao, Zhoufeng Liu, Di Huang, Jiangtao Xi
Faculty of Engineering and Information Sciences - Papers: Part B
In contrast to defect-free fabric images with macro-homogeneous textures and regular patterns, the fabric images with the defect are characterized by the defect regions that are salient and sparse among the redundant background. Therefore, as an effective tool for separating an image into a redundant part (the background) and sparse part (the defect), the low-rank decomposition model provides an ideal solution for patterned fabric defect detection. In this paper, a novel patterned method for fabric defect detection is proposed based on a novel texture descriptor and the low-rank decomposition model. First, an efficient second-order orientation-aware descriptor, denoted as GHOG, is …
Torque Response Characteristics Of A Controllable Electromagnetic Damper For Seat Suspension Vibration Control, Pengfei Liu, Xiangjun Xia, Nong Zhang, Donghong Ning, Minyi Zheng
Torque Response Characteristics Of A Controllable Electromagnetic Damper For Seat Suspension Vibration Control, Pengfei Liu, Xiangjun Xia, Nong Zhang, Donghong Ning, Minyi Zheng
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper, a novel resistance switching method is proposed to control an electromagnetic damper (EMD) system of a vehicle seat suspension, and torque response characteristics of the EMD system are investigated in detail. First, the relationship between electromagnetic torque and circuit resistance of the EMD system is established. The basic parameters of the EMD system are identified by least squares fitting, and the resistance distribution is optimized to meet the demand damping of seat suspension. Second, the electromagnetic torque response time and the continuously dynamic torque tracking performance of the EMD system are investigated experimentally. The time required for …
Fault Diagnosis Of Reciprocating Compressor Using Component Estimating Empirical Mode Decomposition And De-Dimension Template With Double-Loop Correction Algorithm, Hongyi Wang, Feng Dong, Xinxiu Zhou, Hongyu Wang, Xinjun Zhu, Limei Song, Qinghua Guo
Fault Diagnosis Of Reciprocating Compressor Using Component Estimating Empirical Mode Decomposition And De-Dimension Template With Double-Loop Correction Algorithm, Hongyi Wang, Feng Dong, Xinxiu Zhou, Hongyu Wang, Xinjun Zhu, Limei Song, Qinghua Guo
Faculty of Engineering and Information Sciences - Papers: Part B
This paper presents an approach to implement multi-parameter (i.e., pressure, temperature, vibration, current, and liquid level) signals for fault diagnosis of the reciprocating compressor (RC). Due to the complexity of structure and motion of such compressor, the acquired signals involve transient impacts and noises. This causes the useful information to be corrupted and makes it difficult to diagnose the fault patterns accurately. A component estimating empirical mode decomposition (CEEMD) method is proposed to remove the random noise and improve data quality. Furthermore, a new template matching algorithm called de-dimension template with double-loop correction (DDT-DLC) is applied to diagnose the fault …
The Study Of The Directional Sensitivity Of Fiber Bragg Gratings For Acoustic Emission Measurements, Sagar Jinachandran, Abheek Basu, Hui Jun Li, Jiangtao Xi, Gangadhara B. Prusty, Ginu Rajan
The Study Of The Directional Sensitivity Of Fiber Bragg Gratings For Acoustic Emission Measurements, Sagar Jinachandran, Abheek Basu, Hui Jun Li, Jiangtao Xi, Gangadhara B. Prusty, Ginu Rajan
Faculty of Engineering and Information Sciences - Papers: Part B
Structural health monitoring (SHM) of engineering structures plays a crucial role in ensuring their safety and integrity. Acoustic emissions (AE) can be one of the several ways to monitor the structural health. Fiber Bragg grating (FBG)-based AE measurement technique is emerging as a solution to assess cracks in structures remotely and has advantages of being less bulky and having low noise, high bandwidth and ease of implementation. This paper presents a study on the impact of AE signals on FBGs attached to a substrate, focusing on the directional sensitivity using different configurations. For ease of installation, the FBG sensors are …
Metamorphic Testing: Testing The Untestable, Sergio Segura, Dave Towey, Zhi Q. Zhou, Tsong Yueh Chen
Metamorphic Testing: Testing The Untestable, Sergio Segura, Dave Towey, Zhi Q. Zhou, Tsong Yueh Chen
Faculty of Engineering and Information Sciences - Papers: Part B
What if we could know that a program is buggy, even if we could not tell whether or not its observed output is correct? This is one of the key strengths of metamorphic testing, a technique where failures are not revealed by checking an individual concrete output, but by checking the relations among the inputs and outputs of multiple executions of the program under test. Two decades after its introduction, metamorphic testing has become a fully-fledged testing technique with successful applications in multiple domains, including online search engines, autonomous machinery, compilers, Web APIs, and deep learning programs, among others. This …
Mechanical Properties Of Steel, Glass, And Hybrid Fiber Reinforced Reactive Powder Concrete, Atheer Hilal Mahdi Al - Gburi, M Neaz Sheikh, Muhammad N. S Hadi
Mechanical Properties Of Steel, Glass, And Hybrid Fiber Reinforced Reactive Powder Concrete, Atheer Hilal Mahdi Al - Gburi, M Neaz Sheikh, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
This study examines the properties of fiber-reinforced reactive powder concrete (FR-RPC). Steel fibers, glass fibers, and steel-glass hybrid fibers were used to prepare the FR-RPC. The non-fibrous reactive powder concrete (NF-RPC) was prepared as a reference mix. The proportion of fibers by volume for all FR-RPC mixes was 1.5%. Steel fibers of 13 mm length and 0.2 mm diameter were used to prepare the steel fiber-reinforced RPC (SFR-RPC). Glass fibers of 13 mm length and 1.3 mm diameter were used to prepare the glass fiber-reinforced RPC (GFR-RPC). The hybrid fiber-reinforced RPC (HFR-RPC) was prepared by mixing 0.9% steel fibers and …
Mining Phosphorus From Anaerobically Treated Dairy Manure By Forward Osmosis Membrane, Biplob K. Pramanik, Faisal I. Hai, Ashley Ansari, Felicity Roddick
Mining Phosphorus From Anaerobically Treated Dairy Manure By Forward Osmosis Membrane, Biplob K. Pramanik, Faisal I. Hai, Ashley Ansari, Felicity Roddick
Faculty of Engineering and Information Sciences - Papers: Part B
We investigated the effect of draw solution type on the forward osmosis (FO) performance for enriching nutrients from anaerobically treated dairy manure (ATDM) followed by chemical precipitation for phosphorus recovery as struvite crystal. The FO membrane significantly rejected COD (>97%) and phosphate (>98%) whereas there was only 70%-73% and 73%-76% rejection of ammonia-nitrogen and total nitrogen, respectively. The draw solution type had little impact on the retention of the aforementioned wastewater constituents by the FO membrane. At 60% water recovery, a water flux decline of 82%-96% was observed due to increasing contaminant concentration in the concentrated feed solution. …
Improved Performance Of Ballasted Tracks At Transition Zones: A Review Of Experimental And Modelling Approaches, Buddhima Indraratna, Muhammad Babar Sajjad, Ngoc Trung Ngo, A Correia, Richard B. Kelly
Improved Performance Of Ballasted Tracks At Transition Zones: A Review Of Experimental And Modelling Approaches, Buddhima Indraratna, Muhammad Babar Sajjad, Ngoc Trung Ngo, A Correia, Richard B. Kelly
Faculty of Engineering and Information Sciences - Papers: Part B
Track transitionssuch as bridge approaches, road crossings and shifts from slab track to ballasted track are common locations wheretrack degradation accelerates due to dynamic and high impact forces; as a consequence there is higher differential settlement. Thesetypes of discontinuities cause an abrupt change in the structural responseof the track due mainly tovariations in stiffness and track damping. Track transitionzones are prone to an accelerated deterioration of track material and geometrythat leads to increased maintenance costs.Track deteriorationalso leads to vehicle degradation due to enhanced acceleration, low frequency oscillation, and high frequency vibrations. While ballastdeterioration is amajor factor affecting thestability and longevity …
Experimental And Numerical Studies Of Square Concrete-Filled Double Steel Tubular Short Columns Under Eccentric Loading, Mizen Ahmed, Qing Quan Liang, Vipulkumar I. Patel, Muhammad N. S Hadi
Experimental And Numerical Studies Of Square Concrete-Filled Double Steel Tubular Short Columns Under Eccentric Loading, Mizen Ahmed, Qing Quan Liang, Vipulkumar I. Patel, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
Square concrete-filled double steel tubular (CFDST) beam-columns consisting of an internal circular steel tube have increasingly been utilized in composite building structures because of their high structural performance. This paper describes experimental and numerical studies on the structural responses of square thin-walled CFDST columns loaded eccentrically. Tests on twenty short square CFDST columns were undertaken that included sixteen columns under eccentric loading and four columns under concentric loading. The parameters examined in the experiments included the cross-sectional dimensions, the width-to-thickness ratios of outer and internal tubes and loading eccentricity. The measured ultimate strengths, load-shortening responses, load-lateral displacement curves, stress-strain curves …
Anchorage Mechanical Characteristics Of Newly Designed Rebar Bolt And Optimization Of Its Support Scheme, Bingjie Huo, Xuedong Jin, Chen Cao
Anchorage Mechanical Characteristics Of Newly Designed Rebar Bolt And Optimization Of Its Support Scheme, Bingjie Huo, Xuedong Jin, Chen Cao
Faculty of Engineering and Information Sciences - Papers: Part B
In Shendong coalfield, large cross-section underground gateways are often excavated for large machine transportation. It causes large deformation of the surrounding rock and the phenomenon of rib spalling. In this study, taking Xiaobaodang coal mine as the engineering background, a newly designed rebar bolt for large deformational roadway support was introduced to control large deformation. Results that the peak anchoring force of the new bolt increased by 20-30%, the total energy absorption of the system is increased by 35-50%, the post-peak displacement increases by 4.5mm comparing with traditional left-spiral non-longitudinal rebar bolt. The support schemes were analyzed by using FLAC3D, …
Numerical Study Of Circular Double-Skin Concrete-Filled Aluminum Tubular Stub Columns, Vipulkumar I. Patel, Qing Quan Liang, Muhammad N. S Hadi
Numerical Study Of Circular Double-Skin Concrete-Filled Aluminum Tubular Stub Columns, Vipulkumar I. Patel, Qing Quan Liang, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
The sandwiched concrete in a circular double-skin concrete-filled aluminum tubular (DCFAT) column is subjected to the lateral confinement from inner and outer aluminum tubes. The effects of double-skin confinement have not been considered in the existing numerical models for the analysis of DCFAT stub columns. This paper describes a numerical model for the simulation of concentrically compressed circular DCFAT short columns. The numerical model is developed using the fiber element methodology. A new expression for determining the lateral confining pressures on the sandwiched concrete in circular DCFAT stub columns is proposed based on experimental results and incorporated in the computational …
Leucaena Shows Potential In Northern Inland New South Wales, Australia, Carol Harris, S Boschma, Mark Brennan, Lauren Borg, Steven Harden, Brian R. Cullis
Leucaena Shows Potential In Northern Inland New South Wales, Australia, Carol Harris, S Boschma, Mark Brennan, Lauren Borg, Steven Harden, Brian R. Cullis
Faculty of Engineering and Information Sciences - Papers: Part B
A study was conducted during 2013-2017 to evaluate the potential of 5 cultivars/experimental lines of leucaena (Leucaena leucocephala) at 2 sites in Northern Inland NSW. In this frost-prone, summer-dominant rainfall region, all cultivars/lines established well and survival was > 70% at Bingara and > 95% at Manilla. Cultivars Wondergraze and Cunningham were the most productive, producing up to approximately 2.4 t DM/ha and 1.9 t DM/ha per growing season at Bingara and Manilla, respectively. Tropical grass establishment in the alleys was poor with plant productivity inversely related to leucaena productivity. Although this study has confirmed the persistence and productive potential of leucaena, …
Optimisation Framework For Operation Of Battery Storage Within Solar Rich Microgrids, Herath Pathiranage Asanga Priyankara Jayawardana, Ashish P. Agalgaonkar, Duane A. Robinson, Massimo Fiorentini
Optimisation Framework For Operation Of Battery Storage Within Solar Rich Microgrids, Herath Pathiranage Asanga Priyankara Jayawardana, Ashish P. Agalgaonkar, Duane A. Robinson, Massimo Fiorentini
Faculty of Engineering and Information Sciences - Papers: Part B
The growing trend of distributed generation, such as solar photovoltaic (PV) systems and small scale wind turbines have promoted the development of microgrids which are highly dependent on renewable energy. Due to the intermittent nature of renewable energy, these microgrids are generally equipped with energy storage, such as batteries. Batteries are generally operated using fixed control methods, often deviating from the optimal operation. This aspect has created an opportunity to gain improved outcomes for microgrid owners and operators. This research study describes a pathway for designing an optimisation framework which can be used to optimise the charge and discharge operation …
A Novel Multi-Agent-Based Collaborative Virtual Manufacturing Environment Integrated With Edge Computing Technique, Xiaohui Zhang, Shufeng Tang, Xinhua Liu, Reza Malekian, Zhixiong Li
A Novel Multi-Agent-Based Collaborative Virtual Manufacturing Environment Integrated With Edge Computing Technique, Xiaohui Zhang, Shufeng Tang, Xinhua Liu, Reza Malekian, Zhixiong Li
Faculty of Engineering and Information Sciences - Papers: Part B
This paper proposes a multi-agent-based collaborative virtual manufacturing environment (VME) to save energy consumption and improve efficiency in the manufacturing process. In order to achieve the high autonomy of the manufacturing system, a multi-agent system (MAS) is designed to build a collaborative VME. In this new VME environment, edge computing is embedded to strengthen the cyber resource utilization and system economy. Moreover, an efficient communication channel between networks is proposed. The subsequent cooperation and collaboration protocols among agents are designed to ensure flexible and process-oriented operations. Furthermore, the fuzzy resolution algorithm is employed to resolve the competition conflicts among function-similar …
Experimental Investigations On The Behavior Of Gfrp Bar Reinforced Hsc And Uhsc Beams Under Static And Impact Loading, M W. Goldston, Alex M. Remennikov, Zein Saleh, M Neaz Sheikh
Experimental Investigations On The Behavior Of Gfrp Bar Reinforced Hsc And Uhsc Beams Under Static And Impact Loading, M W. Goldston, Alex M. Remennikov, Zein Saleh, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part B
This paper presents an experimental investigation into the behavior of Glass Fiber-Reinforced Polymer (GFRP) bar reinforced high strength concrete and ultra-high strength concrete beams. In total, twelve GFRP bar reinforced concrete beams (GFRP-RC beams) were constructed and tested. Six GFRP-RC beams were tested under static loading. Higher strength concrete was found to influence the overall behavior of GFRP-RC beams under static loading in terms of load carrying capacity, deflection, and post-cracking bending stiffness. Six GFRP-RC beams were tested under impact loading at various levels of impact energy. The GFRP-RC beams displayed a shift in the failure mode (from shear failure …
Natural Sd-Rcca Secure Public-Key Encryptions From Hybrid Paradigms, Yuan Chen, Qingkuan Dong, Yannan Li, Qiqi Lai, Zhedong Wang
Natural Sd-Rcca Secure Public-Key Encryptions From Hybrid Paradigms, Yuan Chen, Qingkuan Dong, Yannan Li, Qiqi Lai, Zhedong Wang
Faculty of Engineering and Information Sciences - Papers: Part B
The existence of natural public-key encryption (PKE) schemes satisfying secretly detectable replayable CCA (sd-RCCA) security is left as open. By introducing probabilistic message authentication codes (MACs) into popular KEM plus DEM paradigms, several instances of such schemes are presented in this paper. It is known that the encrypt-then-authenticate paradigm gives an RCCA secure DEM when the underlying MAC is regular (but not strong) secure, where forgeries for old messages might be possible. By further requiring that the validity of such forgeries can be verified only secretly, sd-RCCA secure DEMs is obtained. Combining such DEMs with CCA secure KEMs gives sd-RCCA …
Simplicity Of Algebras Associated To Non-Hausdorff Groupoids, Lisa Orloff Clark, Ruy Exel Filho, Enrique Pardo, Aidan Sims, Charles Starling
Simplicity Of Algebras Associated To Non-Hausdorff Groupoids, Lisa Orloff Clark, Ruy Exel Filho, Enrique Pardo, Aidan Sims, Charles Starling
Faculty of Engineering and Information Sciences - Papers: Part B
We prove a uniqueness theorem and give a characterization of simplicity for Steinberg algebras associated to non-Hausdorff ample groupoids. We also prove a uniqueness theorem and give a characterization of simplicity for the C*-algebra associated to non-Hausdorff étale groupoids. Then we show how our results apply in the setting of tight representations of inverse semigroups, groups acting on graphs, and self-similar actions. In particular, we show that the C*-algebra and the complex Steinberg algebra of the self-similar action of the Grigorchuk group are simple but the Steinberg algebra with coefficients in Z2 is not simple.
Understanding The Self-Sintering Process Of Bos Filter Cake For Improving Its Recyclability, Raymond Longbottom, Brian J. Monaghan, David J. Pinson, Sheng Chew
Understanding The Self-Sintering Process Of Bos Filter Cake For Improving Its Recyclability, Raymond Longbottom, Brian J. Monaghan, David J. Pinson, Sheng Chew
Faculty of Engineering and Information Sciences - Papers: Part B
Basic oxygen steelmaking (BOS) filter cake has been found to undergo a self-sintering process, improving its mechanical properties to allow easier recycling and utilization on plant. The aim of this study was to gain an understanding of the self-sintering of the BOS filter cake in terms of what reactions occurred, and how strength developed in the filter cake during self-sintering. The approach used was to characterize samples before reaction, and to measure the reactivity of the BOS filter cake during heating in air. Reacted samples were characterized and compared to self-sintered samples from the plant. The BOS filter cake consisted …
Effect Of Cumulative Reduction On The Microstructure And Properties Of The Nm400/Q345r Composite Plate, Pengtao Liu, Lifeng Ma, Weitao Jia, Zhengyi Jiang, Tao Wang, Guanghui Zhao
Effect Of Cumulative Reduction On The Microstructure And Properties Of The Nm400/Q345r Composite Plate, Pengtao Liu, Lifeng Ma, Weitao Jia, Zhengyi Jiang, Tao Wang, Guanghui Zhao
Faculty of Engineering and Information Sciences - Papers: Part B
Interfaces and mechanical properties of the NM400/Q345 composite plates fabricated under different reduction ratios were investigated. An increasing in the cumulative reduction ratio enhanced the bonding interface of the NM400/Q345 composite plate by reducing the number of combinations with interfacial defects such as pores. The oxidation film at the interface was crushed and diffused after three passes of rolling (cumulative reduction ratio = 70%). The strength of the composite also increased with the increasing of cumulative reduction ratio. At the maximum cumulative reduction ratio (70%), the inter-diffusion of the matrix and composite metal was enhanced, and the microstructure became considerably …
Solidification Cracking Susceptibility Of Ferritic Stainless Steels Using Modified Varestraint Transvarestraint (Mvt) Method, D Konadu, Pieter Georg Hendrik Pistorius, Madeleine Du Toit, Axel Griesche
Solidification Cracking Susceptibility Of Ferritic Stainless Steels Using Modified Varestraint Transvarestraint (Mvt) Method, D Konadu, Pieter Georg Hendrik Pistorius, Madeleine Du Toit, Axel Griesche
Faculty of Engineering and Information Sciences - Papers: Part B
The Modified Varestraint Transvarestraint (MVT) test was used to investigate the solidification cracking susceptibility of an unstabilised, a Nb-stabilised and two (Ti + Nb) dual-stabilised ferritic stainless steels. Two different welding speeds of 6 and 3 mm/s using autogenous gas tungsten arc welding were employed. At the welding speed of 6 mm/s, the high-content (Ti + Nb) steel was resistant and the Nb-stabilised steel was marginally susceptible to solidification cracking. At the welding speed of 3 mm/s, the Nb and the high (Ti + Nb) steels were found to be marginally susceptible to solidification cracking while the unstabilised and low-content …
Effect Of Austenisation Temperature On Bainite Transformation Below Martensite Starting Temperature, Junyu Tian, Guang Xu, Zhengyi Jiang, Qing Yuan, Guanghui Chen, Haijiang Hu
Effect Of Austenisation Temperature On Bainite Transformation Below Martensite Starting Temperature, Junyu Tian, Guang Xu, Zhengyi Jiang, Qing Yuan, Guanghui Chen, Haijiang Hu
Faculty of Engineering and Information Sciences - Papers: Part B
Effects of austenisation temperature on martensite and bainite transformation behaviour, microstructure, and mechanical properties of a bainitic steel austempered below martensite starting temperature were investigated in this study. Results show that the amount of athermal martensite gradually increased with the increase of austenisation temperature, whereas the amounts of bainite and retained austenite initially increased and then decreased, resulting in the trend of the first increase and then decrease in the product of tensile strength and elongation. In addition, the transformation rate of isothermal bainite after athermal martensite formation revealed a trend of deceleration and then acceleration with austenisation temperature at …
Analysis Of A Main Cabin Ventilation System In A Jack-Up Offshore Platform Part I: Numerical Modelling, Yingchun Xie, Zepeng Zheng, Huibin Wang, Zhen Xu, Guijie Liu, Reza Malekian, Zhixiong Li
Analysis Of A Main Cabin Ventilation System In A Jack-Up Offshore Platform Part I: Numerical Modelling, Yingchun Xie, Zepeng Zheng, Huibin Wang, Zhen Xu, Guijie Liu, Reza Malekian, Zhixiong Li
Faculty of Engineering and Information Sciences - Papers: Part B
This work aims to measure the thermodynamics of a main cabin ventilation system in a JU-2000E jack-up offshore platform. A three-dimensional (3D) physical model of the ventilation system was established, and the computational fluid dynamics (CFD) software (ANSYS FLUENT) was used to calculate the model thermodynamics. Numerical analysis was performed to investigate the influence mechanisms of the ventilation factors such as ventilation temperature and volume on the ventilation performance. The analysis results demonstrate that (1) top-setting of the exhaust vents is more effective than the side-setting in terms of high temperature reduction, (2) small ventilation temperature and volume can improve …
Unusual Competitive And Synergistic Effects Of Graphite Nanoplates In Engine Oil On The Tribofilm Formation, The Sang Pham, Shanhong Wan, Anh Kiet Tieu, Ming Ma, Hongtao Zhu, Hong Huynh Nguyen, David R. G Mitchell, Mitchell John Bromley Nancarrow
Unusual Competitive And Synergistic Effects Of Graphite Nanoplates In Engine Oil On The Tribofilm Formation, The Sang Pham, Shanhong Wan, Anh Kiet Tieu, Ming Ma, Hongtao Zhu, Hong Huynh Nguyen, David R. G Mitchell, Mitchell John Bromley Nancarrow
Faculty of Engineering and Information Sciences - Papers: Part B
To exploit the improved efficiency from formulated oil modified with graphite nanoplates (GNP), it is important to understand how GNP behave alongside conventional additives such as zinc dialkyl dithiophosphates (ZDDP). The results in this work demonstrate unusual tribological responses of engine oil due to GNP additions, which cannot be explained by the traditionally low shearing mechanism between graphene layers in GNP. A competitive and synergistic effect of GNP on tribofilm formation is proposed for this unusual friction and wear behavior. The presence of GNP modifies the tribofilm formation and spontaneously creates alternate hard and soft regions from the microscopic view …
Comprehensive Analysis Of The Effect Of Ausforming On The Martensite Start Temperature In A Fe-C-Mn-Si Medium-Carbon High-Strength Bainite Steel, Junyu Tian, Guanghui Chen, Yaowen Xu, Zhengyi Jiang, Guang Xu
Comprehensive Analysis Of The Effect Of Ausforming On The Martensite Start Temperature In A Fe-C-Mn-Si Medium-Carbon High-Strength Bainite Steel, Junyu Tian, Guanghui Chen, Yaowen Xu, Zhengyi Jiang, Guang Xu
Faculty of Engineering and Information Sciences - Papers: Part B
The comprehensive effect of strain and ausforming temperature on the martensite start temperature (MS) of a medium-carbon bainite steel was investigated by thermal simulation, optical microscope, scanning electron microscope, etc. It is already known that small strain increases the MS, while larger strain decreases the MS. However, the effect of ausforming temperature on the MS has not been reported and clarified. In this study, the concepts of critical strain (εc) and saturated strain (εs) are proposed. The MS at the critical strain is equal to the MS of …
Sheathless Separation Of Microalgae From Bacteria Using A Simple Straight Channel Based On Viscoelastic Microfluidics, Dan Yuan, Qianbin Zhao, Sheng Yan, Shiyang Tang, Yuxin Zhang, Guolin Yun, Nam-Trung Nguyen, Jun Zhang, Ming Li, Weihua Li
Sheathless Separation Of Microalgae From Bacteria Using A Simple Straight Channel Based On Viscoelastic Microfluidics, Dan Yuan, Qianbin Zhao, Sheng Yan, Shiyang Tang, Yuxin Zhang, Guolin Yun, Nam-Trung Nguyen, Jun Zhang, Ming Li, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part B
Microalgae cells have been recognized as a promising sustainable resource to meet worldwide growing demands for renewable energy, food, livestock feed, water, cosmetics, pharmaceuticals, and materials. In order to ensure high-efficiency and high-quality production of biomass, biofuel, or bio-based products, purification procedures prior to the storage and cultivation of the microalgae from contaminated bacteria are of great importance. The present work proposed and developed a simple, sheathless, and efficient method to separate microalgae Chlorella from bacteria Bacillus Subtilis in a straight channel using the viscoelasticity of the medium. Microalgae and bacteria migrate to different lateral positions closer to the channel …
Metamorphic Relations For Detection Of Performance Anomalies, Owen Johnston, Darryl C. Jarman, Jeffrey Berry, Zhi Q. Zhou, Tsong Yueh Chen
Metamorphic Relations For Detection Of Performance Anomalies, Owen Johnston, Darryl C. Jarman, Jeffrey Berry, Zhi Q. Zhou, Tsong Yueh Chen
Faculty of Engineering and Information Sciences - Papers: Part B
Metamorphic relations can be used to improve performance testing by comparing successive runs of the software under test. We examine one such metamorphic relation for page load times, which we used to discover and repair a race condition in the Adobe Experience Platform Launch Tag Manager. Histograms for page load times had different modalities, which alerted us to the presence of the bug. We discuss the need for performance measures in addition to the popular mean and standard deviation. We describe two approaches to automatically determine modality: Gaussian Mixture Models and the Silverman Test for Multimodality. Metamorphic relations which involve …