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2019

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Articles 25381 - 25410 of 31916

Full-Text Articles in Social and Behavioral Sciences

A Comparison Of Methods For Poverty Estimation In Developing Countries, Sumonkanti Das, Stephen Haslett Jan 2019

A Comparison Of Methods For Poverty Estimation In Developing Countries, Sumonkanti Das, Stephen Haslett

Faculty of Engineering and Information Sciences - Papers: Part B

Small area estimation is a widely used indirect estimation technique for micro-level geographic profiling. Three unit level small area estimation techniques-the ELL or World Bank method, empirical best prediction (EBP) and M-quantile (MQ) - can estimate micro-level Foster, Greer, & Thorbecke (FGT) indicators: poverty incidence, gap and severity using both unit level survey and census data. However, they use different assumptions. The effects of using model-based unit level census data reconstructed from cross-tabulations and having no cluster level contextual variables for models are discussed, as are effects of small area and cluster level heterogeneity. A simulation-based comparison of ELL, EBP …

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High Sensitive Sensing By A Laser Diode With Dual Optical Feedback Operating At Period-One Oscillation, Yuxi Ruan, Bin Liu, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong Jan 2019

High Sensitive Sensing By A Laser Diode With Dual Optical Feedback Operating At Period-One Oscillation, Yuxi Ruan, Bin Liu, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong

Faculty of Engineering and Information Sciences - Papers: Part B

Laser dynamics have great potential for various applications, ranging from cryptography to microwave photonics and instrumentation. This letter presents a design for achieving high sensitive sensing and measurement using the dynamics of a laser diode (LD) with a dual external cavity. In the design, one cavity is used to control the dynamics, making the LD operate at the period-one (P1) oscillation state, and the other one is associated with the quantities to be measured. The Lang-Kobayashi equations are modified and solved to develop a bifurcation diagram for the design, from which we determine the P1 state and investigate the sensing …

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Whitmore Tension Section And Block Shear, Matthew Elliott, Lip H. Teh Jan 2019

Whitmore Tension Section And Block Shear, Matthew Elliott, Lip H. Teh

Faculty of Engineering and Information Sciences - Papers: Part B

This paper examines the validity of the Whitmore net section tension capacity for the design of bolted gusset plates. Using simple algebra, this paper first shows that the Whitmore criterion and the correct block shear criterion would give similar results for a standard connection having approximately seven rows of bolts. It then shows that the Whitmore criterion severely underestimates the actual capacities of connections having two or three bolt rows tested by independent researchers. Conversely, it also shows that the same criterion overestimates the capacities of connections having nine bolt rows that were believed by the testing researchers to fail …

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The Influence Of Sorption Pressure On Gas Diffusion In Coal Particles: An Experimental Study, Xin Yang, Gongda Wang, Junying Zhang, Ting X. Ren Jan 2019

The Influence Of Sorption Pressure On Gas Diffusion In Coal Particles: An Experimental Study, Xin Yang, Gongda Wang, Junying Zhang, Ting X. Ren

Faculty of Engineering and Information Sciences - Papers: Part B

Gas pressure changes during the process of coal mine gas drainage and CBM recovery. It is of great importance to understand the influence of sorption pressure on gas diffusion; however, the topic remains controversial in past studies. In this study, four samples with different coal ranks were collected and diffusion experiments were conducted under different pressures through the adsorption and desorption processes. Three widely used models, i.e., the unipore diffusion (UD) model, the bidisperse diffusion (BD) model and the dispersive diffusion (DD) model, were adopted to compare the applicability and to calculate the diffusion coefficients. Results show that for all …

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Predicted Behavior Of Saturated Granular Waste Blended With Rubber Crumbs, Yujie Qi, Buddhima Indraratna, Matthew Richard Coop Jan 2019

Predicted Behavior Of Saturated Granular Waste Blended With Rubber Crumbs, Yujie Qi, Buddhima Indraratna, Matthew Richard Coop

Faculty of Engineering and Information Sciences - Papers: Part B

Recycling waste materials, such as steel furnace slag (SFS), coal wash (CW), and rubber crumbs (RC) for transport infrastructure is environmentally friendly and offers significant economic benefits. This paper presents a fundamental study of the geotechnical characteristics of this blended matrix (SFSþCWþRC). A semiempirical constitutive model for SFSþCWþRC mixtures is proposed within the framework of critical state (CS) soil mechanics and based on the bounding surface plasticity theory. A CS surface is formulated with the changing RC contents in the waste mixtures, and an experimental relationship between the total work input (Wtotal) and CS parameter (Mcs) is established to capture …

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Flood Mitigation Using An Innovative Flood Control Scheme In A Large Lake: Dongting Lake, China, Yizhuang Liu, Shu-Qing Yang, Changbo Jiang, Muttucumaru Sivakumar, Keith Enever, Yuannan Long, Bin Deng, Usman Khalil, Lingshi Yin Jan 2019

Flood Mitigation Using An Innovative Flood Control Scheme In A Large Lake: Dongting Lake, China, Yizhuang Liu, Shu-Qing Yang, Changbo Jiang, Muttucumaru Sivakumar, Keith Enever, Yuannan Long, Bin Deng, Usman Khalil, Lingshi Yin

Faculty of Engineering and Information Sciences - Papers: Part B

A large lake plays an important role in mitigating flood disasters in its nearby regions during the flooding period; however, the effect is limited, because most of its storage capacity becomes dead storage prior to the arrival of the flood wave. In the current study, an innovative flood control scheme (IFCS) is applied to Dongting Lake (the second largest freshwater lake in China) to alleviate flood disasters. MIKE 21 FM was used to examine its feasibility to mitigate flood disasters. One of the largest floods in the 20th century, the 1998-type flood, was modelled and the maximum water levels with/without …

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Phase Change Material Blind System For Double Skin Façade Integration: System Development And Thermal Performance Evaluation, Yilin Li, Jo Darkwa, Georgios Kokogiannakis, Weiguang Su Jan 2019

Phase Change Material Blind System For Double Skin Façade Integration: System Development And Thermal Performance Evaluation, Yilin Li, Jo Darkwa, Georgios Kokogiannakis, Weiguang Su

Faculty of Engineering and Information Sciences - Papers: Part B

Double skin facades (DSFs) are often applied as energy reducing elements in modern buildings, but do experience overheating problems in warm seasons which may contribute to increase in cooling loads. There are currently various thermal management devices being used in DSF but have limitations such as secondary thermal transmittance and low energy storage capacity. In this paper, a novel laminated composite phase change material (PCM) blind system with high thermal energy storage capacity has been developed and evaluated in a typical DSF building. The results showed that the integrated PCM blind system was able to keep the average air temperature …

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Steady Laminar Natural Convection Of Nanofluid Under The Impact Of Magnetic Field On Two-Dimensional Cavity With Radiation, S Saleem, Trung Nguyen-Thoi, Ahmad Shafee, Zhixiong Li, Ebenezer Bonyah, A Khan, Iqra Shehzadi Jan 2019

Steady Laminar Natural Convection Of Nanofluid Under The Impact Of Magnetic Field On Two-Dimensional Cavity With Radiation, S Saleem, Trung Nguyen-Thoi, Ahmad Shafee, Zhixiong Li, Ebenezer Bonyah, A Khan, Iqra Shehzadi

Faculty of Engineering and Information Sciences - Papers: Part B

In current investigation, steady free convection of nanofluid has been presented in occurrence of magnetic field. Non-Darcy model was utilized to employ porous terms in momentum equations. Working fluid is H2O based nanofluid. Radiation effect has been reported for various shapes of nanoparticles. Impacts of shape factor, radiation parameter, magnetic force, buoyancy and shape impact on nanofluid treatment were demonstrated. Result demonstrated that maximum convective flow is observed for platelet shape. Darcy number produces more random patterns of isotherms.

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Analysis Of Surface Roughness Evolution Of Ferritic Stainless Steel Using Crystal Plasticity Finite Element Method, Xiaoguang Ma, Jingwei Zhao, Wei Du, Xin Zhang, Zhengyi Jiang Jan 2019

Analysis Of Surface Roughness Evolution Of Ferritic Stainless Steel Using Crystal Plasticity Finite Element Method, Xiaoguang Ma, Jingwei Zhao, Wei Du, Xin Zhang, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

In order to evaluate the surface quality of ferritic stainless steel (FSS) sheets tensile deformation, a crystal plasticity (CP) model, in which the constitutive laws were incorporated with the consideration of the heterogeneous distribution of the properties of grains, was established to analyse the effect of texture, grain sizes and initial surface roughness on the surface roughness evolution of FSS sheets. The electron backscatter diffraction (EBSD) tests were performed to characterise the texture and the grains. A tensile test of the represent volume was simulated and further verified by experimental results. The numerical simulation results indicate that the surface roughness …

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Comparison Of Butyric Acid Leaching Behaviors Of Zinc From Three Basic Oxygen Steelmaking Filter Cakes, Jingxiu Wang, Zhe Wang, Zhongzhi Zhang, Guangqing Zhang Jan 2019

Comparison Of Butyric Acid Leaching Behaviors Of Zinc From Three Basic Oxygen Steelmaking Filter Cakes, Jingxiu Wang, Zhe Wang, Zhongzhi Zhang, Guangqing Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

The selective leaching of zinc from three different basic oxygen steelmaking (BOS) filter cakes by butyric acid was investigated to compare the leaching behaviors of zinc and further to establish the correlation of the zinc leaching performances and the chemical compositions. The effects of acid concentration and the acid to solid (L/S) stoichiometric ratio were studied, with different optimal leaching conditions obtained. BOS-1 showed the lowest leachability with only less than 10% of zinc removed by 0.5 M acid concentration and 90% of the L/S stoichiometric ratio in 10 h. The best zinc selectivity was achieved with BOS-2 at 51.2% …

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Preparation Of Al2o3 Hollow Microsphere Via Calcining Carbon Template And Its Adsorption Application, Ying Zhang, Xi Li Jan 2019

Preparation Of Al2o3 Hollow Microsphere Via Calcining Carbon Template And Its Adsorption Application, Ying Zhang, Xi Li

Faculty of Engineering and Information Sciences - Papers: Part B

Carbon microsphere was synthesized from glucose via hydrothermal method, and then alumina hollow microsphere was prepared using carbon template. At reaction time of 6 h, the carbon sphere displayed uniform diameter of 800 nm. After removal of carbon core during calcination, it obtained 600 nm of γ-Al2O3 hollow sphere with shell thickness of 80 nm and surface area of 186 m2/g. For adsorption of methylene blue, material exhibited adsorption capacity of 26.5 ± 1.2 mg/g, fitting well with Langmuir isotherm. It is demonstrated that calcining carbon template was an effective and facile approach to obtain …

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In Situ Characterisation Of Mns Precipitation In High Carbon Steel, Yasuhiro Tanaka, Farshid Pahlevani, Suk Chun Moon, Rian J. Dippenaar, Veena Sahajwalla Jan 2019

In Situ Characterisation Of Mns Precipitation In High Carbon Steel, Yasuhiro Tanaka, Farshid Pahlevani, Suk Chun Moon, Rian J. Dippenaar, Veena Sahajwalla

Faculty of Engineering and Information Sciences - Papers: Part B

Manganese sulphide (MnS) is one of the major non-metallic inclusions in steel with huge impact on steel property. In the case of high carbon steel, due to higher sulphur content and its brittleness, controlling MnS formation is one of the main issues. MnS has a complicated precipitation mechanism during solidification in liquid and solid steel and at the interface with oxide inclusions. Higher sulphur content, lower melting point and different oxide inclusions in high carbon steel will cause MnS precipitation at different stages. In this study, different stages of MnS precipitation from liquid and/or solid in high carbon steel and …

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Oxidation Behaviour Of Steel During Hot Rolling By Using Tio2-Containing Water-Based Nanolubricant, Hui Wu, Chengyang Jiang, Jianqiang Zhang, Shuiquan Huang, Lianzhou Wang, Sihai Jiao, Han Huang, Zhengyi Jiang Jan 2019

Oxidation Behaviour Of Steel During Hot Rolling By Using Tio2-Containing Water-Based Nanolubricant, Hui Wu, Chengyang Jiang, Jianqiang Zhang, Shuiquan Huang, Lianzhou Wang, Sihai Jiao, Han Huang, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

The formation and performance of oxide scale on a low-alloy steel were investigated during hot rolling at 850 and 950 °C under various lubrication conditions, including benchmarks (dry condition and water) and water-based nanolubricants containing various concentrations of nano-TiO2 from 1.0 to 8.0 wt%. The results showed that the addition of nano-TiO2 particles in the lubricant significantly reduced the thickness of oxide scale and surface oxide roughness. The reduction reached the maximum when the concentration of TiO2 was 4.0 wt%. Detailed oxide phase characterisation and oxide component fraction determination revealed that hot rolling destroyed the conventional multi-layer oxide scale and …

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Time Series Analysis Of Online Public Opinions In Colleges And Universities And Its Sustainability, Wei He, Yuan Fang, Reza Malekian, Zhixiong Li Jan 2019

Time Series Analysis Of Online Public Opinions In Colleges And Universities And Its Sustainability, Wei He, Yuan Fang, Reza Malekian, Zhixiong Li

Faculty of Engineering and Information Sciences - Papers: Part B

With the quick penetration of Internet applications, online media have become an important carrier of public opinions. The opinions and comments expressed by young college students-one of the most active netizen groups-on the Internet have turned out to be an essential part of the online public opinions in colleges and universities. However, the existing systems generally employ simple statistical methods to analyze the effect of online public opinions on the image and reputation development of colleges and universities without taking account of other factors, such as the hotness characteristics of online public opinions and semantic information. Therefore, on the basis …

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A Deep Learning Model For Estimating Story Points, Morakot Choetkiertikul, Hoa K. Dam, Truyen Tran, Trang Pham, Aditya K. Ghose, Tim Menzies Jan 2019

A Deep Learning Model For Estimating Story Points, Morakot Choetkiertikul, Hoa K. Dam, Truyen Tran, Trang Pham, Aditya K. Ghose, Tim Menzies

Faculty of Engineering and Information Sciences - Papers: Part B

Although there has been substantial research in software analytics for effort estimation in traditional software projects, little work has been done for estimation in agile projects, especially estimating the effort required for completing user stories or issues. Story points are the most common unit of measure used for estimating the effort involved in completing a user story or resolving an issue. In this paper, we propose a prediction model for estimating story points based on a novel combination of two powerful deep learning architectures: long short-term memory and recurrent highway network. Our prediction system is end-to-end trainable from raw input …

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Towards An Assessment Framework Of Reuse: A Knowledge Level Analysis Approach, Ghassan Beydoun, Achim Hoffmann, Rafael Valencia-Garcia, Jun Shen, Asifqumer Gill Jan 2019

Towards An Assessment Framework Of Reuse: A Knowledge Level Analysis Approach, Ghassan Beydoun, Achim Hoffmann, Rafael Valencia-Garcia, Jun Shen, Asifqumer Gill

Faculty of Engineering and Information Sciences - Papers: Part B

The process of assessing the suitability of reuse of a software component is complex. Indeed, software systems are typically developed as an assembly of existing components. The complexity of the assessment process is due to lack of clarity on how to compare the cost of adaptation of an existing component versus the cost of developing it from scratch. Indeed, often pursuit of reuse can lead to excessive rework and adaptation, or developing suites of components that often get neglected. This paper is an important step towards modelling the complex reuse assessment process. To assess the success factors that can underpin …

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Dimensionality Reduction And Visualization Of Network Intrusion Detection Data, Wei Zong, Yang-Wai Chow, Willy Susilo Jan 2019

Dimensionality Reduction And Visualization Of Network Intrusion Detection Data, Wei Zong, Yang-Wai Chow, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part B

Nowadays, network intrusion detection is researched extensively due to increasing global network threats. Many researchers propose to incorporate machine learning techniques in network intrusion detection systems since these techniques allow for automated intrusion detection with high accuracy. Furthermore, dimensionality reduction techniques can improve the performance of machine learning models, and as such, are widely used as a pre-processing step. Nevertheless, many researchers consider machine learning techniques as a black box because of its complex intrinsic mechanism. Visualization plays an important role in facilitating the understanding of such sophisticated techniques because visualization is able to offer intuitive meaning to the machine …

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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 Jan 2019

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 …

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Alternative Pricing Methods For Shout Call Options, Joanna M. Goard Jan 2019

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.

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Prediction Of Blast Furnace Hearth Condition: Part I - A Steady State Simulation Of Hearth Condition During Normal Operation, Xue Feng Dong, Paul Zulli Jan 2019

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 …

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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 Jan 2019

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 …

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Defect Detection For Patterned Fabric Images Based On Ghog And Low-Rank Decomposition, Chunlei Li, Guangshuai Gao, Zhoufeng Liu, Di Huang, Jiangtao Xi Jan 2019

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 …

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Torque Response Characteristics Of A Controllable Electromagnetic Damper For Seat Suspension Vibration Control, Pengfei Liu, Xiangjun Xia, Nong Zhang, Donghong Ning, Minyi Zheng Jan 2019

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 …

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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 Jan 2019

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 …

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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 Jan 2019

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 …

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Metamorphic Testing: Testing The Untestable, Sergio Segura, Dave Towey, Zhi Q. Zhou, Tsong Yueh Chen Jan 2019

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 …

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Mechanical Properties Of Steel, Glass, And Hybrid Fiber Reinforced Reactive Powder Concrete, Atheer Hilal Mahdi Al - Gburi, M Neaz Sheikh, Muhammad N. S Hadi Jan 2019

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 …

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Mining Phosphorus From Anaerobically Treated Dairy Manure By Forward Osmosis Membrane, Biplob K. Pramanik, Faisal I. Hai, Ashley Ansari, Felicity Roddick Jan 2019

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. …

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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 Jan 2019

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 …

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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 Jan 2019

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 …

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