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A Sparse Linear Algebra Algorithm For Fast Computation Of Prediction Variances With Gaussian Markov Random Fields, Andrew Zammit-Mangion, Jonathon Rougier Jan 2018

A Sparse Linear Algebra Algorithm For Fast Computation Of Prediction Variances With Gaussian Markov Random Fields, Andrew Zammit-Mangion, Jonathon Rougier

Faculty of Engineering and Information Sciences - Papers: Part B

Gaussian Markov random fields are used in a large number of disciplines in machine vision and spatial statistics. The models take advantage of sparsity in matrices introduced through the Markov assumptions, and all operations in inference and prediction use sparse linear algebra operations that scale well with dimensionality. Yet, for very high-dimensional models, exact computation of predictive variances of linear combinations of variables is generally computationally prohibitive, and approximate methods (generally interpolation or conditional simulation) are typically used instead. A set of conditions isestablished under which the variances of linear combinations of random variables can be computed exactly using the …

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

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

Faculty of Engineering and Information Sciences - Papers: Part B

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

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Modeling And Experimental Evaluation Of Bending Behavior Of Soft Pneumatic Actuators Made Of Discrete Actuation Chambers, Gursel Alici, Taylor Canty, Rahim Mutlu, Weiping Hu, Vitor Sencadas Jan 2018

Modeling And Experimental Evaluation Of Bending Behavior Of Soft Pneumatic Actuators Made Of Discrete Actuation Chambers, Gursel Alici, Taylor Canty, Rahim Mutlu, Weiping Hu, Vitor Sencadas

Faculty of Engineering and Information Sciences - Papers: Part B

In this article, we have established an analytical model to estimate the quasi-static bending displacement (i.e., angle) of the pneumatic actuators made of two different elastomeric silicones (Elastosil M4601 with a bulk modulus of elasticity of 262 kPa and Translucent Soft silicone with a bulk modulus of elasticity of 48 kPa - both experimentally determined) and of discrete chambers, partially separated from each other with a gap in between the chambers to increase the magnitude of their bending angle. The numerical bending angle results from the proposed gray-box model, and the corresponding experimental results match well that the model is …

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A Model-Based Design Optimization Strategy For Ground Source Heat Pump Systems With Integrated Photovoltaic Thermal Collectors, Lei Xia, Zhenjun Ma, Georgios Kokogiannakis, Zhihua Wang, Shugang Wang Jan 2018

A Model-Based Design Optimization Strategy For Ground Source Heat Pump Systems With Integrated Photovoltaic Thermal Collectors, Lei Xia, Zhenjun Ma, Georgios Kokogiannakis, Zhihua Wang, Shugang Wang

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents a model-based design optimization strategy for ground source heat pump systems with integrated solar photovoltaic thermal collectors (GSHP-PVT). A dimension reduction strategy using Morris global sensitivity analysis was first used to determine the key design parameters of the GSHP-PVT system. A model-based design optimization strategy was then formulated to identify the optimal values of the key design parameters to minimize the life-cycle cost (LCC) of the GSHP-PVT system, in which an artificial neural network (ANN) model was used for performance prediction and a genetic algorithm (GA) was implemented as the optimization technique. A simulation system of a …

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Vibration Control Of An Energy Regenerative Seat Suspension With Variable External Resistance, Donghong Ning, Shuaishuai Sun, Haiping Du, Weihua Li, Nong Zhang Jan 2018

Vibration Control Of An Energy Regenerative Seat Suspension With Variable External Resistance, Donghong Ning, Shuaishuai Sun, Haiping Du, Weihua Li, Nong Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, an energy regenerative seat suspension with a variable external resistance is proposed and built, and a semi-active controller for its vibration control is also designed and validated. The energy regenerative seat suspension is built with a three-phase generator and a gear reducer, which are installed in the scissors structure centre of the seat suspension, and the vibration energy is directly harvested from the rotary movement of suspension's scissors structure. The electromagnetic torque of the semi-active seat suspension actuator is controlled by an external variable resistor. An integrated model including the seat suspension's kinematics and the generator is …

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Mechanical Behaviour Of Micro-Fine Steel Fibre Reinforced Sulphoaluminate Cement Composite, Hu Feng, Gang Chen, Muhammad N. S Hadi, M Neaz Sheikh, Bowen Zhou Jan 2018

Mechanical Behaviour Of Micro-Fine Steel Fibre Reinforced Sulphoaluminate Cement Composite, Hu Feng, Gang Chen, Muhammad N. S Hadi, M Neaz Sheikh, Bowen Zhou

Faculty of Engineering and Information Sciences - Papers: Part B

In this study, a new cement-based composite with high early strength and toughness was developed by the addition of micro-fine steel fibre (MSF) in sulphoaluminate cement (SAC). The new composite is termed as MSF reinforced SAC composite (MSFRSC). The mechanical behaviour of MSFRSC was experimentally investigated, the flexural toughness and ductility of MSFRSC was evaluated. It was found that the compressive strength, flexural strength, shear strength, flexural toughness and ductility of MSFRSC were significantly influenced by the curing time and volume fraction of MSF. The compressive strength, flexural strength and shear strength of MSFRSC increased with the increase of curing …

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A Review Of Non-Invasive Sensory Feedback Methods For Transradial Prosthetic Hands, Benjamin Stephens-Fripp, Gursel Alici, Rahim Mutlu Jan 2018

A Review Of Non-Invasive Sensory Feedback Methods For Transradial Prosthetic Hands, Benjamin Stephens-Fripp, Gursel Alici, Rahim Mutlu

Faculty of Engineering and Information Sciences - Papers: Part B

Any implant or prosthesis replacing a function or functions of an organ or group of organs should be biologically and sensorily integrated with the human body in order to increase their acceptance with their user. If this replacement is for a human hand, which is an important interface between humans and their environment, the acceptance issue and developing sensory-motor embodiment will be more challenging. Despite progress in prosthesis technologies, 50-60 & #x0025; of hand amputees wear a prosthetic device. One primary reason for the rejection of the prosthetic hands is that there is no or negligibly small feedback or tactile …

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Study Of Solidification Cracking In A Transformation-Induced Plasticity-Aided Steel, Gautam Agarwal, A Kumar, H Gao, Murugaiyan Amirthalingam, Suk Chun Moon, Rian J. Dippenaar, Ian Richardson, Marcel Hermans Jan 2018

Study Of Solidification Cracking In A Transformation-Induced Plasticity-Aided Steel, Gautam Agarwal, A Kumar, H Gao, Murugaiyan Amirthalingam, Suk Chun Moon, Rian J. Dippenaar, Ian Richardson, Marcel Hermans

Faculty of Engineering and Information Sciences - Papers: Part B

In situ high-temperature laser scanning confocal microscopy is applied to study solidification cracking in a TRIP steel. Solidification cracking was observed in the interdendritic region during the last stage of solidification. Atom probe tomography revealed notable enrichment of phosphorus in the last remaining liquid. Phase field simulations also confirm phosphorus enrichment leading to severe undercooling of more than 160 K in the interdendritic region. In the presence of tensile stress, an opening at the interdendritic region is difficult to fill with the remaining liquid due to low permeability and high viscosity, resulting in solidification cracking.

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A Novel Selection Method Of Seismic Attributes Based On Gray Relational Degree And Support Vector Machine, Yaping Huang, Haijun Yang, Xuemei Qi, Reza Malekian, Olivia Pfeiffer, Zhixiong Li Jan 2018

A Novel Selection Method Of Seismic Attributes Based On Gray Relational Degree And Support Vector Machine, Yaping Huang, Haijun Yang, Xuemei Qi, Reza Malekian, Olivia Pfeiffer, Zhixiong Li

Faculty of Engineering and Information Sciences - Papers: Part B

The selection of seismic attributes is a key process in reservoir prediction because the prediction accuracy relies on the reliability and credibility of the seismic attributes. However, effective selection method for useful seismic attributes is still a challenge. This paper presents a novel selection method of seismic attributes for reservoir prediction based on the gray relational degree (GRD) and support vector machine (SVM). The proposed method has a two-hierarchical structure. In the first hierarchy, the primary selection of seismic attributes is achieved by calculating the GRD between seismic attributes and reservoir parameters, and the GRD between the seismic attributes. The …

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Axial And Flexural Behaviour Of Circular Reinforced Concrete Columns Strengthened With Reactive Powder Concrete Jacket And Fibre Reinforced Polymer Wrapping, Muhammad N. S Hadi, Atheer Hilal Mahdi Al - Gburi, M Neaz Sheikh, Allister T. Carrigan Jan 2018

Axial And Flexural Behaviour Of Circular Reinforced Concrete Columns Strengthened With Reactive Powder Concrete Jacket And Fibre Reinforced Polymer Wrapping, Muhammad N. S Hadi, Atheer Hilal Mahdi Al - Gburi, M Neaz Sheikh, Allister T. Carrigan

Faculty of Engineering and Information Sciences - Papers: Part B

This paper investigates axial and flexural behaviour of circular reinforced concrete (RC) columns strengthened with reactive powder concrete (RPC) jacket and fibre reinforced polymer wrapping. The experimental results of 16 circular RC column specimens have been presented. The specimens were divided into four groups of four specimens. Column specimens of the first group were the reference RC specimens without any strengthening, specimens of the second group were strengthened by wrapping with two layers of carbon fibre reinforced polymer (CFRP), specimens of the third group were jacketed with a 25 mm thick layer of RPC and specimens of the fourth group …

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Factors Affecting The Bond Strength Between The Fly Ash-Based Geopolymer Concrete And Steel Reinforcement, Mustafa Sameer Abdulkareem Al-Azzawi, Tao Yu, Muhammad N. S Hadi Jan 2018

Factors Affecting The Bond Strength Between The Fly Ash-Based Geopolymer Concrete And Steel Reinforcement, Mustafa Sameer Abdulkareem Al-Azzawi, Tao Yu, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

In this study, the effect of fly ash characteristics, the content of the fly ash and mix proportion of the Fly Ash-Based Geopolymer Concrete (FBGC) on the bond strength between the FBGC and steel reinforcement were examined. Australian fly ashes from five different sources (Eraring, Mt-Piper, Bayswater, Gladstone and Collie) were used in producing FBGC. A total of 45 FBGC mixes with different fly ash content (300, 400 and 500 kg/m3) and different proportions of alkaline activator were prepared. The use of different fly ashes and in different amounts showed significant differences in the bond strength between the …

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Experimental Investigation On The Effect Of Corrosion On The Bond Between Reinforcing Steel Bars And Fibre Reinforced Geopolymer Concrete, Nabeel Farhan, M Neaz Sheikh, Muhammad N. S Hadi Jan 2018

Experimental Investigation On The Effect Of Corrosion On The Bond Between Reinforcing Steel Bars And Fibre Reinforced Geopolymer Concrete, Nabeel Farhan, M Neaz Sheikh, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

This paper investigates the effect of corrosion on the bond between reinforcing steel bars and fibre reinforced geopolymer concrete. An accelerated corrosion method was used to corrode the reinforcing steel bars embedded in geopolymer concrete. Three types of steel fibres including straight micro steel fibre, deformed macro steel fibre, and hybrid steel fibre were used in this study. A total of ten geopolymer concrete mixes were used to evaluate the effect of corrosion of steel bar on the bond between steel bar and fibre reinforced geopolymer concrete. The pull-out test specimens were composed of concrete cubes with a side length …

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Mechanisms Of Stabilization Of Expansive Soil With Lignosulfonate Admixture, Dennis Pere Alazigha, Buddhima Indraratna, J S. Vinod, Ana Heitor Jan 2018

Mechanisms Of Stabilization Of Expansive Soil With Lignosulfonate Admixture, Dennis Pere Alazigha, Buddhima Indraratna, J S. Vinod, Ana Heitor

Faculty of Engineering and Information Sciences - Papers: Part B

This study investigated and identified the mechanisms by which a remoulded expansive soil was modified or altered by a non-traditional admixture, lignosulfonate (LS). To achieve this objective, untreated and LS treated samples of expansive soil were examined microscopically using X-ray Diffraction (XRD), a Scanning Electron Microscope coupled with Energy Dispersive Spectroscopy (SEM/EDS), Fourier Transform Infrared (FTIR), Computed Tomography (CT-Scan), Nuclear Magnetic Resonance (NMR), Cation Exchange Capacity (CEC), and the role of Specific Surface Area (SSA). The interest was to identify and compare any physical and chemical changes between the untreated and treated samples and then propose the most likely reaction …

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Diagonal-Preserving Graded Isomorphisms Of Steinberg Algebras, Toke Meier Carlsen, James Rout Jan 2018

Diagonal-Preserving Graded Isomorphisms Of Steinberg Algebras, Toke Meier Carlsen, James Rout

Faculty of Engineering and Information Sciences - Papers: Part B

We study Steinberg algebras constructed from ample Hausdorff groupoids over commutative integral domains with identity. We reconstruct (graded) groupoids from (graded) Steinberg algebras and use this to characterize when there is a diagonal-preserving (graded) isomorphism between two (graded) Steinberg algebras. We apply this characterization to groupoids of directed graphs in order to study diagonal-preserving (graded) isomorphisms of Leavitt path algebras and ∗-isomorphisms of graph (Formula presented.)-algebras.

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Real-Time Management Of Groundwater Resource Based On Wireless Sensor Networks, Qingguo Zhou, Chong Chen, Gaofeng Zhang, Huaming Chen, Dan Chen, Yingnan Yan, Jun Shen, Rui Zhou Jan 2018

Real-Time Management Of Groundwater Resource Based On Wireless Sensor Networks, Qingguo Zhou, Chong Chen, Gaofeng Zhang, Huaming Chen, Dan Chen, Yingnan Yan, Jun Shen, Rui Zhou

Faculty of Engineering and Information Sciences - Papers: Part B

Groundwater plays a vital role in the arid inland river basins, in which the groundwater management is critical to the sustainable development of area economy and ecology. Traditional sustainable management approaches are to analyze different scenarios subject to assumptions or to construct simulation–optimization models to obtain optimal strategy. However, groundwater system is time-varying due to exogenous inputs. In this sense, the groundwater management based on static data is relatively outdated. As part of the Heihe River Basin (HRB), which is a typical arid river basin in Northwestern China, the Daman irrigation district was selected as the study area in this …

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Structural Principles Analysis Of Host-Pathogen Protein-Protein Interactions: A Structural Bioinformatics Survey, Huaming Chen, William Guo, Jun Shen, Lei Wang, Jiangning Song Jan 2018

Structural Principles Analysis Of Host-Pathogen Protein-Protein Interactions: A Structural Bioinformatics Survey, Huaming Chen, William Guo, Jun Shen, Lei Wang, Jiangning Song

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.

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On A Cpg-Based Hexapod Robot: Amphihex-Ii With Variable Stiffness Legs, Bin Zhong, Shiwu Zhang, Min Xu, Youcheng Zhou, Tao Fang, Weihua Li Jan 2018

On A Cpg-Based Hexapod Robot: Amphihex-Ii With Variable Stiffness Legs, Bin Zhong, Shiwu Zhang, Min Xu, Youcheng Zhou, Tao Fang, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

Amphibious robots have attracted more and more attention from researchers for their broad applications, while it also brings great challenges in designing appropriate propulsion mechanisms and effective control algorithms. In this paper, we reported a newly designed amphibious hexapod robot-AmphiHex-II. This robot possesses six newly designed variable stiffness legs for adapting various complex environments. This novel design of the variable stiffness leg seamlessly incorporates the advantages of both semi-circular walking legs and the swimming flexible flippers. The legs are constructed by rigid fan-shaped frames which work as walking legs for terrestrial locomotion and protect the contained flexible flippers used for …

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A New Concentration Detection System For Sf6/N2 Mixture Gas In Extra/Ultra High Voltage Power Transmission Systems, Baojun Qu, Qingxin Yang, Yongjian Li, Reza Malekian, Zhixiong Li Jan 2018

A New Concentration Detection System For Sf6/N2 Mixture Gas In Extra/Ultra High Voltage Power Transmission Systems, Baojun Qu, Qingxin Yang, Yongjian Li, Reza Malekian, Zhixiong Li

Faculty of Engineering and Information Sciences - Papers: Part B

This paper develops a new detection system, for the first time, to detect the gas concentrations of the SF6/N2 mixture in extra/ultra-high voltage power transmission systems. The concentrations of SF6 and N2 are calculated from the thermal conductivity function of the mixture gas. The main contribution of this work is that a specially-designed thermostatic chamber with adaptive temperature controller is developed to ensure constant pressure of the gas flowed through the thermal conductivity sensor. Another contribution is the combination of multiple sensors (e.g. humidity and electrochemical sensors), which enables the detector to address the penetration effects of H2O and O2 …

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Changes In Gait And Plantar Foot Loading Upon Using Vibrotactile Wearable Biofeedback System In Patients With Stroke, Christina Ma, Yong-Ping Zheng, Winson Lee Jan 2018

Changes In Gait And Plantar Foot Loading Upon Using Vibrotactile Wearable Biofeedback System In Patients With Stroke, Christina Ma, Yong-Ping Zheng, Winson Lee

Faculty of Engineering and Information Sciences - Papers: Part B

Background: Patients with stroke walk with excessive foot inversion at the affected side, which may disturb their balance and gait. Objectives: This study aimed to investigate the effects of instant biofeedback of plantar force at the medial and lateral forefoot regions on gait and plantar foot loading in patients with stroke. Methods: A total of eight patients with hemiplegic stroke, who had flexible rearfoot varus deformity at the affected side, participated in this study. A vibrotactile biofeedback system was developed and evaluated. It analyzed forces at the medial and lateral forefeet, and instantly provided vibration clues when the plantar force …

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Synthesis Of Highly-Stretchable Graphene - Poly(Glycerol Sebacate) Elastomeric Nanocomposites Piezoresistive Sensors For Human Motion Detection Applications, Yi Yan, Michael Potts, Zhengyi Jiang, Vitor Sencadas Jan 2018

Synthesis Of Highly-Stretchable Graphene - Poly(Glycerol Sebacate) Elastomeric Nanocomposites Piezoresistive Sensors For Human Motion Detection Applications, Yi Yan, Michael Potts, Zhengyi Jiang, Vitor Sencadas

Faculty of Engineering and Information Sciences - Papers: Part B

Strain sensors capable of monitoring human motion are highly desirable not only to monitor in real time complex body parts movement but also to assess the patients' health condition. In this work, highly stretchable elastomeric nanocomposite strain sensors were developed by synthesis of poly(glycerol sebacate) (PGS) prepolymer, followed by incorporation of the graphene flakes (fG) during the curing procedure of the PGS elastomeric matrix. The PGS had Young's modulus (E) of 69 ± 6 kPa, while the sample with 10 wt% fG had a E of 501 ± 28 kPa, which is as soft as human skin. Moreover, the incorporation …

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Coupled Effects Of Initial Orientation Scatter And Grain-Interaction To Texture Evolution: A Crystal Plasticity Fe Study, Hui Wang, Cheng Lu, Anh Kiet Tieu, Lihong Su, Guanyu Deng Jan 2018

Coupled Effects Of Initial Orientation Scatter And Grain-Interaction To Texture Evolution: A Crystal Plasticity Fe Study, Hui Wang, Cheng Lu, Anh Kiet Tieu, Lihong Su, Guanyu Deng

Faculty of Engineering and Information Sciences - Papers: Part B

Grain orientation and neighbourhood are two main factors that determine the in-grain and global texture. The coupled effects of them to texture evolution has not been well understood. In this work, initial orientations scattered from exact Cube at four different levels (2 ° , 5 ° , 20 ° and 45 ° ) were developed, running from near single crystal to polycrystal, which yielded grain-interaction at various grades. A crystal plasticity finite element model was developed and the predicted texture after a 50% and 75% reduction has been validated by experimental observations of both single crystals and polycrystals. When the …

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A New Finite Element Model For Multi-Cycle Accumulative Roll-Bonding Process And Experiment Verification, Hui Wang, Lihong Su, Hai Liang Yu, Cheng Lu, Anh Kiet Tieu, Yu Liu, Jie Zhang Jan 2018

A New Finite Element Model For Multi-Cycle Accumulative Roll-Bonding Process And Experiment Verification, Hui Wang, Lihong Su, Hai Liang Yu, Cheng Lu, Anh Kiet Tieu, Yu Liu, Jie Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

The modelling of multi-cycle accumulative roll-bonding (ARB) is challenging due to the repetitive cutting, stacking and roll-bonding. In this study, a finite element model was proposed and by which the real ARB process was successfully simulated for 5 cycles for the first time. Mapping solution, a remeshing analysis technique, was adopted to transfer the deformation solution from the deformed mesh to a new mesh between cycles, which not only enabled the simulation of discontinuous processes, but also alleviated the mesh distortion. Moreover, with this technique, tensile tests of ARB processed materials were also simulated. The predictions have been validated by …

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

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

Faculty of Engineering and Information Sciences - Papers: Part B

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

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Behavior Of High-Strength Concrete Columns Reinforced With Galvanized Steel Equal-Angle Sections Under Different Loading Conditions, Muhammad N. S Hadi, Ayoob Ibrahim, M Neaz Sheikh Jan 2018

Behavior Of High-Strength Concrete Columns Reinforced With Galvanized Steel Equal-Angle Sections Under Different Loading Conditions, Muhammad N. S Hadi, Ayoob Ibrahim, M Neaz Sheikh

Faculty of Engineering and Information Sciences - Papers: Part B

Experimental results are presented for a new method of reinforcing concrete columns with galvanized steel equal-angle (GSEA) sections. For the same cross-sectional area, a GSEA section has a higher second moment of area than a conventional steel bar, which leads to a higher bending stiffness of the GSEA reinforced concrete member. In addition, the area of confined concrete is higher in GSEA reinforced concrete members than in steel bar reinforced members, which results in higher strength and ductility. The experimental program involved testing of 20 square, high-strength concrete (HSC) specimens under concentric axial load, eccentric axial load, and four-point loading. …

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Effects Of Fly Ash Characteristics And Alkaline Activator Components On Compressive Strength Of Fly Ash-Based Geopolymer Mortar, Muhammad N. S Hadi, Mustafa Sameer Abdulkareem Al-Azzawi, Tao Yu Jan 2018

Effects Of Fly Ash Characteristics And Alkaline Activator Components On Compressive Strength Of Fly Ash-Based Geopolymer Mortar, Muhammad N. S Hadi, Mustafa Sameer Abdulkareem Al-Azzawi, Tao Yu

Faculty of Engineering and Information Sciences - Papers: Part B

The compressive strength of fly ash-based geopolymer mortar (FBGM) made from five different sources of fly ash was examined. The weight ratio of alkaline activator to fly ash content (AL/FA), the weight ratio of sodium silicate to sodium hydroxide (Na2SiO3/NaOH) and concentration of the NaOH were considered the main parameters. A total of 180 FBGM mixes were prepared and tested for compressive strength. The results indicated that the optimum AL/FA ratio for activating fly ashes was in the range of 0.5 and 0.6. The compressive strength of the FBGM that were mixed with different fly ashes …

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Investigation On The Vibration Effect Of Shock Wave In Rock Burst By In Situ Microseismic Monitoring, Mingshi Gao, Hongchao Zhao, Yichao Zhao, Xiaojun Gao, Xiangyu Wang Jan 2018

Investigation On The Vibration Effect Of Shock Wave In Rock Burst By In Situ Microseismic Monitoring, Mingshi Gao, Hongchao Zhao, Yichao Zhao, Xiaojun Gao, Xiangyu Wang

Faculty of Engineering and Information Sciences - Papers: Part B

Rock burst is a physical explosion associated with enormous damage at a short time. Due to the complicity of mechanics of rock burst in coal mine roadway, the direct use of traditional investigation method applied in tunnel is inappropriate since the components of surrounding rock are much more complex in underground than that of tunnel. In addition, the reliability of the results obtained through these methods (i.e., physical simulation, theoretical analysis, and monitoring in filed application) is still not certain with complex geological conditions. Against this background, present experimental study was first ever conducted at initial site to evaluate the …

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Assessing The Integration Of Forward Osmosis And Anaerobic Digestion For Simultaneous Wastewater Treatment And Resource Recovery, Ashley Ansari, Faisal I. Hai, William E. Price, Hao H. Ngo, Wenshan Guo, Long D. Nghiem Jan 2018

Assessing The Integration Of Forward Osmosis And Anaerobic Digestion For Simultaneous Wastewater Treatment And Resource Recovery, Ashley Ansari, Faisal I. Hai, William E. Price, Hao H. Ngo, Wenshan Guo, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part B

This study assessed the performance and key challenges associated with the integration of forward osmosis (FO) and anaerobic digestion for wastewater treatment and resource recovery. Using a thin film composite polyamide FO membrane, maximising the pre-concentration factor (i.e. system water recovery) resulted in the enrichment of organics and salinity in wastewater. Biomethane potential evaluation indicated that methane production increased correspondingly with the FO pre-concentration factor due to the organic retention in the feed solution. At 90% water recovery, about 10% more methane was produced when using NaOAc compared with NaCl because of the contribution of biodegradable reverse NaOAc flux. No …

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Simplifying Sensemaking: Concept, Process, Strengths, Shortcomings, And Ways Forward For Information Systems In Contemporary Business Environments, Morteza Namvar, Jacob Cybulski, Cynthia Phang, Chong-Yaw Wee, Kevin Y. L Tan Jan 2018

Simplifying Sensemaking: Concept, Process, Strengths, Shortcomings, And Ways Forward For Information Systems In Contemporary Business Environments, Morteza Namvar, Jacob Cybulski, Cynthia Phang, Chong-Yaw Wee, Kevin Y. L Tan

Faculty of Engineering and Information Sciences - Papers: Part B

2018 Namvar, Cybulski, Phang, Ee & Tan. Sensemaking is a popular and useful organizational behaviour concept that is gaining visibility in the field of information systems. However, it remains relatively unknown compared to more established information systems concepts like technology acceptance and resistance. To enhance and propel greater use of sensemaking in information systems, this article offers a systematic explanation of sensemaking, specifically focusing on its concept, process, strengths, and shortcomings, as well as discussing ways forward for information systems in contemporary business environments.

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Data Privacy And System Security For Banking And Financial Services Industry Based On Cloud Computing Infrastructure, Abhishek Mahalle, Jianming Yong, Xiaohui Tao, Jun Shen Jan 2018

Data Privacy And System Security For Banking And Financial Services Industry Based On Cloud Computing Infrastructure, Abhishek Mahalle, Jianming Yong, Xiaohui Tao, Jun Shen

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.

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Iterative Receivers For Downlink Mimo-Scma: Message Passing And Distributed Cooperative Detection, Weijie Yuan, Nan Wu, Qinghua Guo, Yonghui Li, Chengwen Xing, Jingming Kuang Jan 2018

Iterative Receivers For Downlink Mimo-Scma: Message Passing And Distributed Cooperative Detection, Weijie Yuan, Nan Wu, Qinghua Guo, Yonghui Li, Chengwen Xing, Jingming Kuang

Faculty of Engineering and Information Sciences - Papers: Part B

IEEE The rapid development of the mobile communications requires ever higher spectral efficiency. The non-orthogonal multiple access (NOMA) has emerged as a promising technology to further increase the access efficiency of wireless networks. Amongst several NOMA schemes, the sparse code multiple access (SCMA) has been shown to be able to achieve better performance. In this paper, we consider a downlink MIMOSCMA system over frequency selective fading channels. For optimal detection, the complexity increases exponentially with the product of the number of users, the number of antennas and the channel length. To tackle this challenge, we propose near optimal low-complexity iterative …

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