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Articles 931 - 960 of 14358
Full-Text Articles in Social and Behavioral Sciences
Effect Of Water-Based Nanolubricant Containing Nano-Tio2 On Friction And Wear Behaviour Of Chrome Steel At Ambient And Elevated Temperatures, Hui Wu, Fanghui Jia, Jingwei Zhao, Shuiquan Huang, Lianzhou Wang, Sihai Jiao, Han Huang, Zhengyi Jiang
Effect Of Water-Based Nanolubricant Containing Nano-Tio2 On Friction And Wear Behaviour Of Chrome Steel At Ambient And Elevated Temperatures, Hui Wu, Fanghui Jia, Jingwei Zhao, Shuiquan Huang, Lianzhou Wang, Sihai Jiao, Han Huang, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
A novel experimental method was developed through a ball-on-disk tribometer to study the friction and wear behaviour of a chrome steel at temperatures of 25, 200 and 500 °C. Water-based nanolubricants containing different concentrations of nano-TiO2 from 0.4 to 8.0 wt% were used to investigate their effects on friction-reduction and anti-wear mechanisms, in comparison to the benchmarks under dry and water conditions. The results show that the water-based nanolubricants can significantly reduce coefficient of friction (COF) and improve wear resistance of the chrome steel at both ambient and elevated temperatures. In particular, the use of nanolubricant containing an optimal concentration …
Analysis Of Surface Roughness Alteration In Micro Flexible Rolling, Mingshuai Huo, Jingwei Zhao, Haibo Xie, Zhou Li, Shengli Li, Hongmei Zhang, Zhengyi Jiang
Analysis Of Surface Roughness Alteration In Micro Flexible Rolling, Mingshuai Huo, Jingwei Zhao, Haibo Xie, Zhou Li, Shengli Li, Hongmei Zhang, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
Thin strip with varying thickness, a novel structural and functional material, is fabricated by micro flexible rolling, and has three thickness features including the thicker zone, the thinner zone and the transition zone. Rolling and roll lifting speeds determine the thickness distributions, and have a great influence on the surface roughness, then the final product quality which is of significant importance for thin materials in subsequent processing. In this study, surface roughness alteration of aluminium alloy strips during micro flexible rolling was investigated with considering the influences of rolling speeds, roll lifting speeds, thickness ratios (the ratio of the thicker …
Adhesion, Friction And Wear Analysis Of A Chromium Oxide Scale On A Ferritic Stainless Steel, Xiawei Cheng, Zhengyi Jiang, Dongbin Wei, Hui Wu, Laizhu Jiang
Adhesion, Friction And Wear Analysis Of A Chromium Oxide Scale On A Ferritic Stainless Steel, Xiawei Cheng, Zhengyi Jiang, Dongbin Wei, Hui Wu, Laizhu Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
The aim of this study is to explore the potential engineering application of a thermally grown chromium oxide scale on a ferritic stainless steel. The friction and wear behaviour of the oxide scale were investigated by scratch and pin-on-disk tests. The failure mechanisms of the oxide scale subjected to scratch tests under both progressive and constant loading were investigated. It shows that the oxide scale adheres well to the steel substrate and is in a ductile failure. The oxide scale leads to an increase in the coefficient of friction (COF) under different constant loads when compared to what occurs when …
Insights Into The Behavior Of Polyphosphate Lubricant In Hot Rolling Of Mild Steel, Shaogang Cui, Hongtao Zhu, Anh Kiet Tieu, Guanyu Deng, Shanhong Wan, Qiang Zhu, Bingjing Lin
Insights Into The Behavior Of Polyphosphate Lubricant In Hot Rolling Of Mild Steel, Shaogang Cui, Hongtao Zhu, Anh Kiet Tieu, Guanyu Deng, Shanhong Wan, Qiang Zhu, Bingjing Lin
Faculty of Engineering and Information Sciences - Papers: Part B
Hot rolling with a large reduction is usually performed to produce the fine-grained strips, which leads to a severe wear of work roll and affect substantially the strip quality. As a result, lubricants are usually introduced to reduce these problems, with inorganic polyphosphate glass polymer showing the most promising prospective. This study aims to provide a new insight into the lubrication film at roll/strip interface in hot rolling. A series of lubricated hot rolling tests were performed by a 40wt% sodium metaphosphate aqueous solution under 20-60% reduction, at 950-1150 °C and 0.5 m/s. Thermal behaviors of sodium polyphosphate and the …
A Method Of Uncertainty Analysis For Whole-Life Embodied Carbon Emissions (Co2-E) Of Building Materials Of A Net-Zero Energy Building In Australia, Mehdi Robati, Daniel J. Daly, Georgios Kokogiannakis
A Method Of Uncertainty Analysis For Whole-Life Embodied Carbon Emissions (Co2-E) Of Building Materials Of A Net-Zero Energy Building In Australia, Mehdi Robati, Daniel J. Daly, Georgios Kokogiannakis
Faculty of Engineering and Information Sciences - Papers: Part B
The construction of new buildings requires the use of a substantial amount of materials, which have an associated embodied energy for manufacturing, transport, construction and end-of-life disposal. A number of inventories have been developed to collate the typical embodied energy or carbon emissions associated with different building materials and activities, and these can be used to quantify the environmental impacts of different construction methods. However, uncertainty exists in the estimation of embodied CO2-e emissions and other environmental impact results, due to i) inconsistencies in typical embodied carbon emissions values in inventories; ii) errors in estimations of material quantities; iii) assumptions …
Improved Dynamic Stall Prediction Of Wind Turbine Airfoils, Xiong Liu, Cheng Lu, Shi Liang, Ajit R. Godbole, Yan Chen
Improved Dynamic Stall Prediction Of Wind Turbine Airfoils, Xiong Liu, Cheng Lu, Shi Liang, Ajit R. Godbole, Yan Chen
Faculty of Engineering and Information Sciences - Papers: Part B
This paper presents a dynamic stall model to predict the unsteady airloads on wind turbine airfoils. The proposed model is based on the Beddoes-Leishman (B-L) model and modifications are carried out for wind turbine applications. The lift, drag, and pitch moment of the S809 airfoil oscillating in stall-development and deep-stall regimes are predicted. Validation against available experimental data shows overall good agreement.
Moisture Diffusion Measurement And Evaluation For Porous Membranes Used In Enthalpy Exchangers, Ahmed Khafeef Obaid Al-Bdoor, Zhenjun Ma, Paul Cooper
Moisture Diffusion Measurement And Evaluation For Porous Membranes Used In Enthalpy Exchangers, Ahmed Khafeef Obaid Al-Bdoor, Zhenjun Ma, Paul Cooper
Faculty of Engineering and Information Sciences - Papers: Part B
Air-to-air membrane enthalpy exchangers using semi-permeable membranes are widely used in building ventilation systems to pre-condition the supply air by exchanging energy with the exhaust air stream. Moisture diffusivity is one of the most important properties of porous membranes. This property has a significant influence on the design and performance of membrane enthalpy exchangers. In this study, moisture diffusion resistances of five porous membranes were measured, and the effects of the membrane pore size on the moisture diffusivity were evaluated under different test conditions. The five porous membranes tested included: I) two PVDF (Polyvinylidene difluoride) membranes with mean pore diameters …
Study On Performance Evaluation Of Co2 Heat Pump System Integrated With Thermal Energy Storage For Space Heating, Zhihua Wang, Yuxin Zheng, Fenghao Wang, Mengjie Song, Zhenjun Ma
Study On Performance Evaluation Of Co2 Heat Pump System Integrated With Thermal Energy Storage For Space Heating, Zhihua Wang, Yuxin Zheng, Fenghao Wang, Mengjie Song, Zhenjun Ma
Faculty of Engineering and Information Sciences - Papers: Part B
CO2 heat pumps have drawn a great deal of attention owing to their advantages of high efficiency and environmental friendly for heating water under low ambient temperature. However, the system performance is not desirable and shows a lower COP for space heating, especially for a radiator as heating terminal, due to the higher inlet water temperature at the gas cooler, which causes a large throttle loss when the refrigerant flow through the throttling device. To tackle this issue, a transcritical CO2 heat pump system integrated with thermal energy storage (TES) systems was developed in this paper. The heating performance of …
Periodic Deprivation Of Gaseous Hydrogen Sulfide Affects The Activity Of The Concrete Corrosion Layer In Sewers, Xiaoyan Sun, Guangming Jiang, Philip Bond, Jurg Keller
Periodic Deprivation Of Gaseous Hydrogen Sulfide Affects The Activity Of The Concrete Corrosion Layer In Sewers, Xiaoyan Sun, Guangming Jiang, Philip Bond, Jurg Keller
Faculty of Engineering and Information Sciences - Papers: Part B
Sulfide induced concrete corrosion significantly reduces the service life of the sewer systems. Gaseoushydrogen sulfide (H2S) levels are a key factor affecting the corrosion rate and thesefluctuate due to thediurnalflow pattern of sewers. Currently, there is little known about how suchfluctuations, in particularthe periodic deprivation of H2S, may affect the corrosion activity. This study investigated the impact ofthe deprivation of H2S on the sulfide uptake rate (SUR) of concrete coupons incubated in laboratorycorrosion chambers. After systematic evaluation of the gaseous H2S concentration profiles of two sewersystems, two types of profiles, i.e. short- (1 h) and long- (12 h) term deprivation …
Persulfate Oxidation-Assisted Membrane Distillation Process For Micropollutant Degradation And Membrane Fouling Control, Muhammad Bilal Asif, Zulqarnain Fida, Arbab Tufail, Jason Van Der Merwe, Frederic Leusch, Biplob K. Pramanik, William E. Price, Faisal I. Hai
Persulfate Oxidation-Assisted Membrane Distillation Process For Micropollutant Degradation And Membrane Fouling Control, Muhammad Bilal Asif, Zulqarnain Fida, Arbab Tufail, Jason Van Der Merwe, Frederic Leusch, Biplob K. Pramanik, William E. Price, Faisal I. Hai
Faculty of Engineering and Information Sciences - Papers: Part B
In this study, long-term performance of a persulfate (PS)-assisted direct contact membrane distillation (DCMD) process was examined for the treatment of secondary treated effluent spiked with a mixture of micropollutants including three pesticides and nine pharmaceuticals. A stand-alone DCMD ('control') was also operated under identical operating conditions for comparison. Depending on the micropollutant, the stand-alone DCMD achieved 86 to >99% removal. In comparison, removal by the PS-assisted DCMD was >99% for all investigated micropollutants. This was attributed to the fact that sulfate radicals (SO4-) formed following the activation of PS at the DCMD operating temperature (i.e., 40 °C) achieved micropollutant-specific …
Experimental Investigation Of Fracture Propagation Behavior Induced By Hydraulic Fracturing In Anisotropic Shale Cores, Zhaohui Chong, Qiangling Yao, Xuehua Li
Experimental Investigation Of Fracture Propagation Behavior Induced By Hydraulic Fracturing In Anisotropic Shale Cores, Zhaohui Chong, Qiangling Yao, Xuehua Li
Faculty of Engineering and Information Sciences - Papers: Part B
Hydraulic fracturing is a key technology for the development of unconventional resources such as shale gas. Due to the existence of numerous bedding planes, shale reservoirs can be considered typical anisotropic materials. In anisotropic shale reservoirs, the complex hydraulic fracture network (HFN) formed by the interaction of hydraulic fracture (HF) and bedding plane (BP) is the key to fracturing treatment. In this paper, considering the anisotropic angle, stress state and injection rate, a series of hydraulic fracturing experiments were conducted to investigate the effect of anisotropic characteristics of shale reservoirs on HFN formation. The results showed that the breakdown pressure …
Strong Tunable Photomixing In Semi-Dirac Materials In The Terahertz Regime, Sunchao Huang, My Hanh Tran, Jack Zuber, Qian Wang, Yiming Zhu, C Zhang
Strong Tunable Photomixing In Semi-Dirac Materials In The Terahertz Regime, Sunchao Huang, My Hanh Tran, Jack Zuber, Qian Wang, Yiming Zhu, C Zhang
Faculty of Engineering and Information Sciences - Papers: Part B
We demonstrate a strong and anisotropic photomixing effect in an electronic system whose energy–momentum dispersion is parabolic in the 𝑥 direction and linear in the 𝑦 direction, such as a TiO2/VO2 multilayered structure. The third-order photoresponses along the linear and parabolic directions have been analyzed and determined quantitatively. We have found a remarkable tunability of the mixing efficiency along the parabolic direction by a small electric field in the linear direction, up to two orders of magnitude. In the terahertz (THz) regime, the third-order response is comparable to the linear response under an applied field of 10 …
Asthma Management Application For Consumers: Nudging As A Feature, Nawaf Almutairi, Elena Vlahu-Gjorgievska, Khin Than Win
Asthma Management Application For Consumers: Nudging As A Feature, Nawaf Almutairi, Elena Vlahu-Gjorgievska, Khin Than Win
Faculty of Engineering and Information Sciences - Papers: Part B
Asthma is a serious global health problem and can be seen in all age groups and a number of asthma management applications have been created aiming to increase self-management. The aim of this paper is to identify nudging strategy for the asthma management application based on the context awareness. Nudging feature is proposed to increase the self-management, patient engagement, and symptoms control. The final proposed application was implemented from a theoretical perspective.
Building Integration Of Stator-Augmented Powerwindow, A Linear Cascade Wind Turbine, Seyed A. Jafari, Sina Hassanli, Kenny Kwok, Farzad Safaei, Buyung Kosasih, Ming Zhao
Building Integration Of Stator-Augmented Powerwindow, A Linear Cascade Wind Turbine, Seyed A. Jafari, Sina Hassanli, Kenny Kwok, Farzad Safaei, Buyung Kosasih, Ming Zhao
Faculty of Engineering and Information Sciences - Papers: Part B
This study investigates power generation capacity of stator-augmented PowerWindow, a linear cascade wind turbine, when installed in through-building openings of a tall building. By employing a new approach, referred to as equivalent momentum sink method, the flow characteristics of the ducted flow, such as its pressure, velocity, and turbulence intensity are predicted when subjected to different wind directions in presence of a wind turbine. This study shows that a properly designed layout maintains the velocity in the through-building openings for a wide range of wind directions and enhances the power generation by 50%-80% in comparison with the free-stream wind turbine …
Fertility Detection Of Hatching Eggs Based On A Convolutional Neural Network, Lei Geng, Yuzhou Hu, Zhitao Xiao, Jiangtao Xi
Fertility Detection Of Hatching Eggs Based On A Convolutional Neural Network, Lei Geng, Yuzhou Hu, Zhitao Xiao, Jiangtao Xi
Faculty of Engineering and Information Sciences - Papers: Part B
In order to achieve the goal of detecting the fertility of hatching eggs which are divided into fertile eggs and dead eggs more accurately and effectively, a novel method combining a convolution neural network (CNN) and a heartbeat signal of the hatching eggs is proposed in this paper. Firstly, we collected heartbeat signals of 9-day-later hatching eggs by the method of PhotoPlethysmoGraphy (PPG), which is a non-invasive method to detect the change of blood volume in living tissues by photoelectric means. Secondly, a sequential convolutional neural network E-CNN, which was used to analyze heartbeat sequence of hatching eggs, was designed. …
Tribological Behaviour Of Enamel Coatings, Hong Huynh Nguyen, Shanhong Wan, Anh Kiet Tieu, Sang Pham, Hongtao Zhu
Tribological Behaviour Of Enamel Coatings, Hong Huynh Nguyen, Shanhong Wan, Anh Kiet Tieu, Sang Pham, Hongtao Zhu
Faculty of Engineering and Information Sciences - Papers: Part B
An experimental study has been carried out to evaluate the tribological and mechanical properties of steel hardened with glass-ceramic enamel under ambient conditions. Three types of borosilicate based enamels were fused onto mild steel by the firing process, after a sandblasting and a ground coat to ensure surface integrity between the substrate and the covering coat. The surface roughness, micro hardness, wear track and tribological characteristics of the enamel coating were then characterised by an atomic force microscopy, a Vicker micro-hardness tester, a 3D optical profiler, an EDS/SEM, and a friction and wear testing tribology meter. The tribological differentials of …
Correlation Between Crystal Rotation And Redundant Shear Strain In Rolled Single Crystals: A Crystal Plasticity Fe Analysis, Hui Wang, Cheng Lu, Anh Kiet Tieu, Yu Liu, Rui Wang, Jintao Li
Correlation Between Crystal Rotation And Redundant Shear Strain In Rolled Single Crystals: A Crystal Plasticity Fe Analysis, Hui Wang, Cheng Lu, Anh Kiet Tieu, Yu Liu, Rui Wang, Jintao Li
Faculty of Engineering and Information Sciences - Papers: Part B
The correlation between crystal rotation and redundant shear strain in rolled single crystals was investigated by using the crystal plasticity finite element (CPFE) model in this paper. The deformation in aluminium single crystals of four representative orientations (rotated-Cube, Goss, Copper, and Brass) after rolling and plain strain compression was simulated, and the predictions have been validated by the experimental observations. In the rotated-Cube and Goss, the redundant shear strain and crystal rotation were in the same pattern, alternating along the thickness, while the relation between them was not obvious for the Copper and Brass due to their asymmetrical distributions of …
A Numerical And Experimental Analysis Of An Integrated Teg-Pcm Power Enhancement System For Photovoltaic Cells, Jo Darkwa, J Calautit, Dengfeng Du, Georgios Kokogiannakis
A Numerical And Experimental Analysis Of An Integrated Teg-Pcm Power Enhancement System For Photovoltaic Cells, Jo Darkwa, J Calautit, Dengfeng Du, Georgios Kokogiannakis
Faculty of Engineering and Information Sciences - Papers: Part B
Solar photovoltaic (PV) cells especially crystal silicon cells have witnessed a soaring installed capacity during past years. Research efforts have been made to increase the PV conversion efficiency and one direction is towards the cooling of PV systems since a higher PV temperature impairs its conversion efficiency. Phase change materials (PCM) capable of storing large amounts of latent heat are found to be effective on cooling PV cells while thermoelectric generators (TEG) which are solid waste heat converters can be used for converting the heat from PV into electricity. Therefore, this research investigates the concept of an integrated thermoelectric PCM …
Numerical Investigations On The Flexural Behavior Of Gfrp-Rc Beams Under Monotonic Loads, Zein Saleh, M Neaz Sheikh, Alex M. Remennikov, Abheek Basu
Numerical Investigations On The Flexural Behavior Of Gfrp-Rc Beams Under Monotonic Loads, Zein Saleh, M Neaz Sheikh, Alex M. Remennikov, Abheek Basu
Faculty of Engineering and Information Sciences - Papers: Part B
The behaviour of Glass Fibre-Reinforced Polymer (GFRP) bar reinforced concrete beams varies significantly from the behaviour of traditional steel bar reinforced concrete beams. This paper numerically investigates the response of GFRP bar reinforced concrete (GFRP-RC) beams under monotonic loads. This paper also presents the details of a three-dimensional Finite Element (FE) model for GFRP-RC beams under monotonic loads. The results of the numerical modelling have been validated against the experimental results of nine GFRP-RC beams. The results of the FE analysis have been found to be in very good agreement with the experimental results. Furthermore, a parametric study is carried …
Pullout Behaviour Of Different Types Of Steel Fibres Embedded In Magnesium Phosphate Cementitious Matrix, Hu Feng, M Neaz Sheikh, Muhammad N. S Hadi, Lu Feng, Danying Gao, Jun Zhao
Pullout Behaviour Of Different Types Of Steel Fibres Embedded In Magnesium Phosphate Cementitious Matrix, Hu Feng, M Neaz Sheikh, Muhammad N. S Hadi, Lu Feng, Danying Gao, Jun Zhao
Faculty of Engineering and Information Sciences - Papers: Part B
A series of pullout tests were conducted to investigate the interface bond properties of seven types of steel fibres embedded in the magnesium phosphate cementitious matrix. The micromorphology of the interface transition zone between MPC and different types of fibres was examined by scanning electron microscope. Test results showed that smaller diameter steel fibres with brass coating surface achieved higher average bond strength, higher pullout energy per unit volume and a higher ratio of material use. The end hook deformation provided the mechanical bond locally whereas the deformation along the length of fibre provided the mechanical bond distributed along the …
Residual Capacity Of Cold-Formed Steel Rack Uprights Following Stomping During Rocking, James Maguire, Lip H. Teh, G Charles Clifton, James Lim
Residual Capacity Of Cold-Formed Steel Rack Uprights Following Stomping During Rocking, James Maguire, Lip H. Teh, G Charles Clifton, James Lim
Faculty of Engineering and Information Sciences - Papers: Part B
When selective pallet racks are allowed to rock in the cross-aisle direction during an earthquake, the uprights are subjected to short duration high axial forces at stomping. In this paper, the amplitude of the stomping force needed to compromise the upright's residual capacity is assessed for 59 configurations using nonlinear inelastic static and dynamic analyses. Parametric studies are performed to investigate the effects of upright length, bracing pitch, section slenderness, torsional restraints and multiple impulses on the residual capacity of an upright due to rocking. Uprights that fail in the flexural-torsional buckling mode perform better than those that fail by …
A National Wastewater Monitoring Program For A Better Understanding Of Public Health: A Case Study Using The Australian Census, Jake O'Brien, Sharon Grant, Andrew Banks, Raimondo Bruno, Stephen Carter, Phil Choi, Adrian Covaci, Nicholas Crosbie, Coral Gartner, Wayne Hall, Guangming Jiang, Sarit Kaserzon, K Kirkbride, Foon Lai, Rachel Mackie, Judi Marshall, Christoph Ort, Christopher Paxman, Jeremy Prichard, Phong K. Thai, Kevin Thomas, Ben Tscharke, Jochen F. Mueller
A National Wastewater Monitoring Program For A Better Understanding Of Public Health: A Case Study Using The Australian Census, Jake O'Brien, Sharon Grant, Andrew Banks, Raimondo Bruno, Stephen Carter, Phil Choi, Adrian Covaci, Nicholas Crosbie, Coral Gartner, Wayne Hall, Guangming Jiang, Sarit Kaserzon, K Kirkbride, Foon Lai, Rachel Mackie, Judi Marshall, Christoph Ort, Christopher Paxman, Jeremy Prichard, Phong K. Thai, Kevin Thomas, Ben Tscharke, Jochen F. Mueller
Faculty of Engineering and Information Sciences - Papers: Part B
Wastewater contains a large range of biological and chemical markers of human activity and exposures. Through systematic collection and analysis of these markers within wastewater samples it is possible to measure the public health of whole populations. The analysis of effluent and biosolids can also be used to understand the release of chemicals from wastewater treatment plants into the environment. Wastewater analysis and comparison with catchment specific data (e.g. demographics) however remains largely unexplored. This manuscript describes a national wastewater monitoring study that combines influent, effluent and biosolids sampling with the Australian Census. An archiving program allows estimation of per …
Combining Evolutionary Computation With The Variable Neighbourhood Search In Creating An Artificial Music Composer, Reza Zamani
Combining Evolutionary Computation With The Variable Neighbourhood Search In Creating An Artificial Music Composer, Reza Zamani
Faculty of Engineering and Information Sciences - Papers: Part B
This paper presents a procedure which composes music pieces through handling four layers in music, namely pitches, rhythms, dynamics, and timber. As an innovative feature, the procedure uses the combination of a genetic algorithm with a synergetic variable neighbourhood search. Uniform and one-point crossover operators as well as two mutation operators conduct the search in the employed genetic algorithm. The key point with these four operators is that the uniform crossover operator and the first mutation operator are indiscriminate, in the sense of using no knowledge of music theory, whereas the employed one-point crossover operator and the second mutation operator …
Spectral Flow Of Monopole Insertion In Topological Insulators, Alan L. Carey, Hermann Schulz-Baldes
Spectral Flow Of Monopole Insertion In Topological Insulators, Alan L. Carey, Hermann Schulz-Baldes
Faculty of Engineering and Information Sciences - Papers: Part B
Inserting a magnetic flux into a two-dimensional one-particle Hamiltonian leads to a spectral flow through a given gap which is equal to the Chern number of the associated Fermi projection. This paper establishes a generalization to higher even dimension by inserting non-abelian monopoles of the Wu-Yang type. The associated spectral flow is then equal to a higher Chern number. For the study of odd spacial dimensions, a new so-called 'chirality flow' is introduced which, for the insertion of a monopole, is then linked to higher winding numbers. This latter fact follows from a new index theorem for the spectral flow …
Optimal Investment And Consumption Under A Continuous-Time Cointegration Model With Exponential Utility, Guiyuan Ma, Song-Ping Zhu
Optimal Investment And Consumption Under A Continuous-Time Cointegration Model With Exponential Utility, Guiyuan Ma, Song-Ping Zhu
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper, we study the effects of cointegration on optimal investment and consumption strategies for an investor with exponential utility. A Hamilton-Jacobi-Bellman (HJB) equation is derived first and then solved analytically. Both the optimal investment and consumption strategies are expressed in closed form. A verification theorem is also established to demonstrate that the solution of the HJB equation is indeed the solution of the original optimization problem under an integrability condition. In addition, a simple and sufficient condition is proposed to ensure that the integrability condition is satisfied. Financially, the optimal investment and consumption strategies are decomposed into two …
Global Regularity Of Optimal Mappings In Non-Convex Domains, Shibing Chen, Jiakun Liu, Xu-Jia Wang
Global Regularity Of Optimal Mappings In Non-Convex Domains, Shibing Chen, Jiakun Liu, Xu-Jia Wang
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper, we establish a global regularity result for the optimal transport problem with the quadratic cost, where the domains may not be convex. This result is obtained by a perturbation argument, using a recent global regularity of optimal transportation in convex domains by the authors.
A Mixed Finite Element Method For A Sixth-Order Elliptic Problem, Jerome Droniou, Muhammad Ilyas, Bishnu Lamichhane, Glen Wheeler
A Mixed Finite Element Method For A Sixth-Order Elliptic Problem, Jerome Droniou, Muhammad Ilyas, Bishnu Lamichhane, Glen Wheeler
Faculty of Engineering and Information Sciences - Papers: Part B
We consider a saddle-point formulation for a sixth-order partial differential equation and its finite element approximation, for two sets of boundary conditions. We follow the Ciarlet-Raviart formulation for the biharmonic problem to formulate our saddle-point problem and the finite element method. The new formulation allows us to use the H 1 -conforming Lagrange finite element spaces to approximate the solution. We prove a priori error estimates for our approach. Numerical results are presented for linear and quadratic finite element methods.
Flexural Design Of Gfrp Bar Reinforced Concrete Beams: An Appraisal Of Code Recommendations, Zein Saleh, Matthew Goldston, Alex M. Remennikov, M Neaz Sheikh
Flexural Design Of Gfrp Bar Reinforced Concrete Beams: An Appraisal Of Code Recommendations, Zein Saleh, Matthew Goldston, Alex M. Remennikov, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper, two design codes for the flexural design of Fibre Reinforced Polymer (FRP) bar reinforced concrete beams have been reviewed and compared with the results of the experimental investigations of eight GFRP (Glass Fibre-Reinforced Polymer) bar reinforced concrete (GFRP-RC) beams. It has been demonstrated that experimentally determined load carrying capacities, maximum deflections and energy absorbing capacities have been over-predicted by the relevant code recommendations for the under-reinforced and balanced GFRP-RC beams while being under-predicted for the over-reinforced GFRP-RC beams. This paper will provide a better understanding on the design methods in the two codes to the designers and …
Influence Of Soil Clogging On The Performance Of Jute Fibre Drains Installed In Ballina Clay, Thanh Trung Nguyen, Buddhima Indraratna, John Philip Carter
Influence Of Soil Clogging On The Performance Of Jute Fibre Drains Installed In Ballina Clay, Thanh Trung Nguyen, Buddhima Indraratna, John Philip Carter
Faculty of Engineering and Information Sciences - Papers: Part B
Biodegradable prefabricated vertical drains (BPVD) made from naturally occurring materials such as jute and coconut (coir) fibre not only have favourable engineering characteristics but also not detri-mental to the natural environment thanks to their biodegradability. Although the use of these natural fibre drains has been proposed for several decades, their application is still very limited. One of major reasons for this is because they are usually composed of individual fibres with large openings which can trap fine soils while discharging pore pressure, consequently reducing the hydraulic conductivity of the drain. This study therefore aims to clarify how soil can clog …
Knowledge-Aided Target Detection For Multistatic Passive Radar, Guohao Sun, Wei Zhang, Jun Tong, Zishu He, Zhihang Wang
Knowledge-Aided Target Detection For Multistatic Passive Radar, Guohao Sun, Wei Zhang, Jun Tong, Zishu He, Zhihang Wang
Faculty of Engineering and Information Sciences - Papers: Part B
This paper studies the detection problem for multistatic passive radar. We consider scenarios where prior knowledge about the spectrum and peak-to-average ratio (PAR) of the non-cooperative illuminators of opportunity (IOs) is available. We develop several knowledge-aided (KA) detectors within the framework of the generalized likelihood ratio test (GLRT) to exploit such prior knowledge. Particularly, the knowledge about the bandwidth of the transmitted signal is employed to suppress the out-of-band noise, and the knowledge about the PAR constraint is exploited to eliminate the remaining high-power noise. The challenge of unknown spectrum condition is also addressed, where block sparse Bayesian learning (BSBL) …