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Articles 301 - 330 of 14367

Full-Text Articles in Social and Behavioral Sciences

Evaluation Of The Ptw Microdiamond In Edge-On Orientation For Dosimetry In Small Fields, Owen Brace, Sultan Alhujaili, Jason Paino, Duncan Butler, Dean Wilkinson, Bradley M. Oborn, Anatoly B. Rosenfeld, Michael L. F Lerch, Marco Petasecca, Jeremy A. Davis Jan 2020

Evaluation Of The Ptw Microdiamond In Edge-On Orientation For Dosimetry In Small Fields, Owen Brace, Sultan Alhujaili, Jason Paino, Duncan Butler, Dean Wilkinson, Bradley M. Oborn, Anatoly B. Rosenfeld, Michael L. F Lerch, Marco Petasecca, Jeremy A. Davis

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine Purpose: The PTW microDiamond has an enhanced spatial resolution when operated in an edge-on orientation but is not typically utilized in this orientation due to the specifications of the IAEA TRS-483 code of practice for small field dosimetry. In this work the suitability of an edge-on orientation and advantages over the recommended face-on orientation will be presented. Methods: The PTW microDiamond in both orientations was compared on a Varian TrueBeam linac for: machine output factor (OF), …

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Modeling A Thick Hydrogenated Amorphous Silicon Substrate For Ionizing Radiation Detectors, Jeremy A. Davis, Maurizio Boscardin, Michele Crivellari, Livio Fano, Matthew Large, Mauro Menichelli, Arianna Morozzi, Francesco Moscatelli, Maria Movileanu-Ionica, Daniele Passeri, Marco Petasecca, Mauro Piccini, Alessandro Rossi, Andrea Scorzoni, Bailey Thompson, Giovanni Verzellesi, Nicolas Wyrsch Jan 2020

Modeling A Thick Hydrogenated Amorphous Silicon Substrate For Ionizing Radiation Detectors, Jeremy A. Davis, Maurizio Boscardin, Michele Crivellari, Livio Fano, Matthew Large, Mauro Menichelli, Arianna Morozzi, Francesco Moscatelli, Maria Movileanu-Ionica, Daniele Passeri, Marco Petasecca, Mauro Piccini, Alessandro Rossi, Andrea Scorzoni, Bailey Thompson, Giovanni Verzellesi, Nicolas Wyrsch

Faculty of Engineering and Information Sciences - Papers: Part B

© Copyright © 2020 Davis, Boscardin, Crivellari, Fanò, Large, Menichelli, Morozzi, Moscatelli, Movileanu-Ionica, Passeri, Petasecca, Piccini, Rossi, Scorzoni, Thompson, Verzellesi and Wyrsch. There is currently a renewed interest in hydrogenated amorphous silicon (a-Si:H) for use in particle detection applications. Whilst this material has been comprehensively investigated from a numerical perspective within the context of photovoltaic and imaging applications, the majority of work related to its application in particle detection has been limited to experimental studies. In this study, a material model to mimic the electrical and charge collection behavior of a-Si:H is developed using the SYNOPSYS©Technology Computer Aided Design (TCAD) …

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A Novel Monte Carlo-Based Neural Network Model For Electricity Load Forecasting, Binbin Yong, Zijian Xu, Jun Shen, Huaming Chen, Jianqing Wu, Fucun Li, Qingguo Zhou Jan 2020

A Novel Monte Carlo-Based Neural Network Model For Electricity Load Forecasting, Binbin Yong, Zijian Xu, Jun Shen, Huaming Chen, Jianqing Wu, Fucun Li, Qingguo Zhou

Faculty of Engineering and Information Sciences - Papers: Part B

The ongoing rapid growth of electricity over the past few decades greatly promotes the necessity of accurate electricity load forecasting. However, despite a great number of studies, electricity load forecasting is still an enormous challenge for its complexity. Recently, the developments of machine learning technologies in different research areas have demonstrated its great advantages. General Vector Machine (GVM) is a new machine learning model, which has been proven very effective in time series prediction. In this article, we firstly review the basic concepts and implementation of GVM. Then we apply it in electricity load forecasting, which is based on the …

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Apex2s: A Two-Layer Machine Learning Model For Discovery Of Host-Pathogen Protein-Protein Interactions On Cloud-Based Multiomics Data, Huaming Chen, Jun Shen, Lei Wang, Chi-Hung Chi Jan 2020

Apex2s: A Two-Layer Machine Learning Model For Discovery Of Host-Pathogen Protein-Protein Interactions On Cloud-Based Multiomics Data, Huaming Chen, Jun Shen, Lei Wang, Chi-Hung Chi

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.

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Aggregatable Certificateless Designated Verifier Signature, Pairat Thorncharoensri, Willy Susilo Jan 2020

Aggregatable Certificateless Designated Verifier Signature, Pairat Thorncharoensri, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part B

In recent years, the Internet of Things (IoT) devices have become increasingly deployed in many industries and generated a large amount of data that needs to be processed in a timely and efficient manner. Using aggregate signatures, it provides a secure and efficient way to handle large numbers of digital signatures with the same message. Recently, the privacy issue has been concerned about the topic of data sharing on the cloud. To provide the integrity, authenticity, authority, and privacy on the data sharing in the cloud storage, the notion of an aggregatable certificateless designated verifier signature scheme (ACLDVS) was proposed. …

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Quantitative Verification For Monitoring Event-Streaming Systems, Guoxin Su, Li Liu, Minjie Zhang, David Rosenblum Jan 2020

Quantitative Verification For Monitoring Event-Streaming Systems, Guoxin Su, Li Liu, Minjie Zhang, David Rosenblum

Faculty of Engineering and Information Sciences - Papers: Part B

IEEE High-performance data streaming technologies are increasingly adopted in IT companies to support the integration of heterogeneous and possibly distributed service systems and applications. Compared with the traditional message queuing middleware, a streaming platform enables the implementation of event-streaming systems (ESS) which include not only complex queues but also applications that transform and react to the streams of data. By analysing the centralised data streams, one can evaluate the Quality-of-Service for other systems and components that produce or consume the streams. We consider the exploitation of probabilistic model checking as a performance monitoring technique for ESS systems. Probabilistic model checking …

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The Mechanism And Effects Of Subgrade Fluidisation Under Ballasted Railway Tracks, Buddhima Indraratna, Mandeep Singh, Thanh Trung Nguyen Jan 2020

The Mechanism And Effects Of Subgrade Fluidisation Under Ballasted Railway Tracks, Buddhima Indraratna, Mandeep Singh, Thanh Trung Nguyen

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020, The Author(s). The rapid growth in railway infrastructure and the construction of high-speed heavy-haul rail network, especially on ground that is basically unsuitable, poses challenges for geotechnical engineers because a large part of the money invested in the development of railway lines is often spent on track maintenance. In fact around the world, the mud pumping of subgrade fines is one of the common reasons why track performance deteriorates and track stability is hindered. This article presents a series of laboratory tests to examine following aspects of mud pumping: (1) the mechanisms of subgrade fluidisation under undrained condition, …

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Synthesis And Characterization Of Additive Graphene Oxide Nanoparticles Dispersed In Water: Experimental And Theoretical Viscosity Prediction Of Non-Newtonian Nanofluid, Yang Xu, Quyen Nguyen, Omid Malekahmadi, Ramin Hadi, Zahra Jokar, Ali Mardani, Arash Karimipour, Ramin Ranjbarzadeh, Zhixiong Li, Quang Bach Jan 2020

Synthesis And Characterization Of Additive Graphene Oxide Nanoparticles Dispersed In Water: Experimental And Theoretical Viscosity Prediction Of Non-Newtonian Nanofluid, Yang Xu, Quyen Nguyen, Omid Malekahmadi, Ramin Hadi, Zahra Jokar, Ali Mardani, Arash Karimipour, Ramin Ranjbarzadeh, Zhixiong Li, Quang Bach

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 John Wiley & Sons, Ltd. Graphene oxide (GO) is a mixture of carbon, oxygen, and hydrogen. GO sheets used to make tough composite materials, thin films, and membranes. GO-water nanofluid's rheological behavior was investigated in this research. Various mass fractions: 1.0, 1.5, 2.0, 2.5, and 3.5 mg/ml; different temperature ranges: 25°C, 30°C, 35°C, 40°C, 45°C, and 50°C; and several shear ranges: 12.23, 24.46, 36.69, 61.15, 73.38, and 122.3 s−1 were studied. X-ray diffraction analysis (XRD), energy dispersive X-ray analysis (EDX), dynamic light scattering analysis (DLS), and Fourier-transform infrared (FTIR) tests studied to analyze phase and structure. Field emission …

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Enhanced Interface Strength In Steel-Nickel Bimetallic Component Fabricated Using Wire Arc Additive Manufacturing With Interweaving Deposition Strategy, Bintao Wu, Zhijun Qiu, Zengxi Stephen Pan, Kristin R. Carpenter, Tong Wang, Donghong Ding, Stephen Van Duin, Hui Jun Li Jan 2020

Enhanced Interface Strength In Steel-Nickel Bimetallic Component Fabricated Using Wire Arc Additive Manufacturing With Interweaving Deposition Strategy, Bintao Wu, Zhijun Qiu, Zengxi Stephen Pan, Kristin R. Carpenter, Tong Wang, Donghong Ding, Stephen Van Duin, Hui Jun Li

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 Realizing improved strength in composite metallic materials remains a challenge using conventional welding and joining systems due to the generation and development of brittle intermetallic compounds caused by complex thermal profiles during solidification. Here, wire arc additive manufacturing (WAAM) process was used to fabricate a steel-nickel structural component, whose average tensile strength of 634 MPa significantly exceeded that of feedstock materials (steel, 537 MPa and nickel, 455 MPa), which has not been reported previously. The as-fabricated sample exhibited hierarchically structural heterogeneity due to the interweaving deposition strategy. The improved mechanical response during tensile testing was due to the …

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Lane Work-Schedule Of Toll Station Based On Queuing Theory And Pso-Lstm Model, Peng Wang, Jiandong Zhao, Yuan Gao, Miguel Sotelo, Zhixiong Li Jan 2020

Lane Work-Schedule Of Toll Station Based On Queuing Theory And Pso-Lstm Model, Peng Wang, Jiandong Zhao, Yuan Gao, Miguel Sotelo, Zhixiong Li

Faculty of Engineering and Information Sciences - Papers: Part B

© 2013 IEEE. A reasonable lane work-schedule in each time period can not only guarantee the traffic efficiency of toll stations, but also reduce the operating cost of toll stations. This paper proposes a comprehensive solution for lane work plan. Firstly, the average queue length is selected as a good index for measuring the congestion of toll station. And then, based on the queuing theory, the service level of toll station is divided into four levels according to the relationship between the average queue length and traffic capacity. Secondly, based on the toll data, a toll station congestion prediction model …

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A Review Of Secondary Flow In Inertial Microfluidics, Qianbin Zhao, Dan Yuan, Jun Zhang, Weihua Li Jan 2020

A Review Of Secondary Flow In Inertial Microfluidics, Qianbin Zhao, Dan Yuan, Jun Zhang, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 by the authors. Inertial microfluidic technology, which can manipulate the target particle entirely relying on the microchannel characteristic geometry and intrinsic hydrodynamic effect, has attracted great attention due to its fascinating advantages of high throughput, simplicity, high resolution and low cost. As a passive microfluidic technology, inertial microfluidics can precisely focus, separate, mix or trap target particles in a continuous and high-flow-speed manner without any extra external force field. Therefore, it is promising and has great potential for a wide range of industrial, biomedical and clinical applications. In the regime of inertial microfluidics, particle migration due to inertial …

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Thermal Conductivity Enhancement Of Nanofluid By Adding Multiwalled Carbon Nanotubes: Characterization And Numerical Modeling Patterns, Congcong Du, Quyen Nguyen, Omid Malekahmadi, Ali Mardani, Zahra Jokar, Elmira Babadi, Annunziata D'Orazio, Arash Karimipour, Zhixiong Li, Quang Bach Jan 2020

Thermal Conductivity Enhancement Of Nanofluid By Adding Multiwalled Carbon Nanotubes: Characterization And Numerical Modeling Patterns, Congcong Du, Quyen Nguyen, Omid Malekahmadi, Ali Mardani, Zahra Jokar, Elmira Babadi, Annunziata D'Orazio, Arash Karimipour, Zhixiong Li, Quang Bach

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 John Wiley & Sons, Ltd. Nanofluid is divided in two major section, mono nanofluid (MN) and hybrid nanofluid (HN). MN is created when a solid nanoparticle disperses in a fluid, whereas HN has more than one solid nanomaterial. In this research, iron (III) oxide (Fe3O4) is MN, and Fe3O4 plus multiwalled carbon nanotube (MWCNT) is HN, whereas both are mixed and dispersed into the water basefluid. Thermal conductivity (TC) of Fe3O4/water and MWCNT/Fe3O4/water was measured after preparation and numerical model performed on the resulted data. After that, field emission scanning electron microscope (FESEM) was studied for microstructural observation …

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Influence Of Backward-Facing Step On The Mixing Efficiency Of Multi Microjets At Supersonic Flow, Zhixiong Li, R Moradi, Seyed Marashi, Houman Babazadeh, Gautam Choubey Jan 2020

Influence Of Backward-Facing Step On The Mixing Efficiency Of Multi Microjets At Supersonic Flow, Zhixiong Li, R Moradi, Seyed Marashi, Houman Babazadeh, Gautam Choubey

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 IAA The injection of the fuel is a highly important process for the enhancement of the scramjets. In this article, the presence of the backward-facing step on the mixing of the multi-fuel jets is expansively studied. The primary attention of this article is to scrutinize the flow feature of the fuel jet under the backward-facing step. The mixing mechanism of the fuel is also studied to compare this injection system with conventional methods. To do this, a 3-dimensional model is chosen to consider the real physic of the problem. Reynolds Average Navier-Stocks equations are solved with a computational …

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Influence Of White Etching Layer On Rolling Contact Behavior At Wheel-Rail Interface, Qinglin Lian, Guanyu Deng, Hongtao Zhu, Hui Jun Li, Xi Wang, Zhiming Liu Jan 2020

Influence Of White Etching Layer On Rolling Contact Behavior At Wheel-Rail Interface, Qinglin Lian, Guanyu Deng, Hongtao Zhu, Hui Jun Li, Xi Wang, Zhiming Liu

Faculty of Engineering and Information Sciences - Papers: Part B

The existence of narrow and brittle white etching layers (WELs) on the rail surface is often linked with the formation of rail defects such as squats and studs, which play the key roles in rail surface degradation and tribological performance. In the present study, a systematic investigation on stress/strain distribution and fatigue life of the WEL during wheel-rail rolling contact was conducted based on a numerical model considering the realistic wheel geometry. This is the first study considering the influence of rail materials, loading pressure, frictional condition, WEL geometry (a/b), and slip ratio (Sr) in the practical service conditions at …

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Numerical Assessment On The Hydrothermal Behavior And Irreversibility Of Mgo-Ag/Water Hybrid Nanofluid Flow Through A Sinusoidal Hairpin Heat-Exchanger, Zhixiong Li, Amin Shahsavar, Kavian Niazi, Abdullah Al-Rashed, Sara Rostami Jan 2020

Numerical Assessment On The Hydrothermal Behavior And Irreversibility Of Mgo-Ag/Water Hybrid Nanofluid Flow Through A Sinusoidal Hairpin Heat-Exchanger, Zhixiong Li, Amin Shahsavar, Kavian Niazi, Abdullah Al-Rashed, Sara Rostami

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 Elsevier Ltd The aim of this work is to study the hydrothermal and irreversibility characteristics in forced convection flow of Ag-MgO/water hybrid nanofluid through a sinusoidal hairpin heat-exchanger, numerically. The impact of nano-additive concentration (φ), Reynolds number (Re) and amplitude of the sinusoidal tube are investigated on the heat-exchanger performance form both the first law and second law points of view. The considered performance matrices are heat transfer rate, total heat transfer coefficient, heat-exchanger effectiveness, pressure loss, pumping power as well as the irreversibilities due to flow friction and heat transfer. The findings indicated that boosting the Re …

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Design Of (Hf,Ta)Fe2/Fe Composite With Zero Thermal Expansion Covering Room Temperature, Dongyu Cen, Bin Wang, Ruixue Chu, Yuanyuan Gong, Guizhou Xu, Fenghua Chen, Feng Xu Jan 2020

Design Of (Hf,Ta)Fe2/Fe Composite With Zero Thermal Expansion Covering Room Temperature, Dongyu Cen, Bin Wang, Ruixue Chu, Yuanyuan Gong, Guizhou Xu, Fenghua Chen, Feng Xu

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 Acta Materialia Inc. MgZn2-type (Hf,Ta)Fe2 is a typical negative-thermal-expansion system, which expands during the establishment of ferromagnetic ordering in cooling. This abnormal behavior suggests that (Hf,Ta)Fe2 is a potential ingredient to produce a composite with zero thermal expansion. In this work, we find that the as-cast (Hf,Ta)Fe2 have Fe-rich grain boundaries, which disappear after annealing. It inspires us to produce a (Hf,Ta)Fe2/Fe composite by adding extra Fe in nonstoichiometric composition without annealing. After carefully tuning Hf/Ta ratio and Fe concentration, room-temperature zero-thermal-expansion is achieved in the sample with a composition of Hf0.80Ta0.20Fe2.5.

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Effect Of Copper Nanoparticles On Thermal Behavior Of Water Flow In A Zig-Zag Nanochannel Using Molecular Dynamics Simulation, Yu Jiang, Sadegh Dehghan, Arash Karimipour, Davood Toghraie, Zhixiong Li, Iskander Tlili Jan 2020

Effect Of Copper Nanoparticles On Thermal Behavior Of Water Flow In A Zig-Zag Nanochannel Using Molecular Dynamics Simulation, Yu Jiang, Sadegh Dehghan, Arash Karimipour, Davood Toghraie, Zhixiong Li, Iskander Tlili

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 Elsevier Ltd Molecular dynamics (MD) simulation is one of the most common simulation methods which predict the dynamical and thermodynamical properties of atomic structures based on classical Newton's laws. In this study, the effect of copper nanoparticles on the thermal behavior of the fluid in zig-zag nanochannel was investigated using molecular dynamics simulation. In our simulations, water molecules were used to model the base fluid, and platinum atoms were used to model the nanochannel walls. To investigate the effects of copper nanoparticles on the base fluid, physical quantities such as potential energy, density, velocity, temperature profiles, and finally, …

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Conditions For The Existence, Identification And Calculus Rules Of The Threshold Of Prox-Boundedness, Chayne Planiden Jan 2020

Conditions For The Existence, Identification And Calculus Rules Of The Threshold Of Prox-Boundedness, Chayne Planiden

Faculty of Engineering and Information Sciences - Papers: Part B

2020, Springer-Verlag GmbH Germany, part of Springer Nature. This note advances knowledge of the threshold of prox-boundedness of a function; an important concern in the use of proximal point optimization algorithms and in determining the existence of the Moreau envelope of the function. In finite dimensions, we study general prox-bounded functions and then focus on some useful classes such as piecewise functions and Lipschitz continuous functions. The thresholds are explicitly determined when possible and bounds are established otherwise. Some calculus rules are constructed; we consider functions with known thresholds and find the thresholds of their sum and composition.

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Bayesian Computation With Intractable Likelihoods, Matthew T. Moores, Anthony N. Pettitt, Kerrie Mengersen Jan 2020

Bayesian Computation With Intractable Likelihoods, Matthew T. Moores, Anthony N. Pettitt, Kerrie Mengersen

Faculty of Engineering and Information Sciences - Papers: Part B

This article surveys computational methods for posterior inference with intractable likelihoods, that is where the likelihood function is unavailable in closed form, or where evaluation of the likelihood is infeasible. We review recent developments in pseudo-marginal methods, approximate Bayesian computation (ABC), the exchange algorithm, thermodynamic integration, and composite likelihood, paying particular attention to advancements in scalability for large datasets. We also mention R and MATLAB source code for implementations of these algorithms, where they are available.

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Natural Convection And Entropy Generation Of A Nanofluid Around A Circular Baffle Inside An Inclined Square Cavity Under Thermal Radiation And Magnetic Field Effects, Zhixiong Li, Ahmed Hussein, Obai Younis, Masoud Afrand, Shizhe Feng Jan 2020

Natural Convection And Entropy Generation Of A Nanofluid Around A Circular Baffle Inside An Inclined Square Cavity Under Thermal Radiation And Magnetic Field Effects, Zhixiong Li, Ahmed Hussein, Obai Younis, Masoud Afrand, Shizhe Feng

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 Elsevier Ltd A numerical investigation of the free convection of the Al2O3/water nanofluid was carried out in a square cavity. The cavity was tilted and exposed to a constant horizontal magnetic field. Radiation also occurred in the cavity, and entropy generation was also investigated. The left-hand and right-hand walls of the cavity were kept at a fixed temperature (Tc), while the upper and lower walls were insulated. A circular baffle with a radius of R and a temperature of Th was placed in the middle of the cavity. According to the results, amplifying the Rayleigh number (Ra) improved …

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A Printed Yagi Antenna For Cubesat With Multi-Frequency Tilt Operation, Sining Liu, Raad Raad, Panagiotis Theoharis, Faisel Em M Tubbal Jan 2020

A Printed Yagi Antenna For Cubesat With Multi-Frequency Tilt Operation, Sining Liu, Raad Raad, Panagiotis Theoharis, Faisel Em M Tubbal

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, a printed Yagi antenna with an integrated balun is proposed for CubeSat communications. The printed antenna is mechanically adjustable to realize three functional states at different operating frequencies in the L‐band and S‐band respectively. Three different angle deployments are proposed at 10°, 50° and 90°, so that the antenna operates at three different operating frequencies, namely 1.3 GHz (L‐band), 2.4 GHz (S‐band) and 3 GHz (S‐band). The measured results of the fabricated antenna are well matched with the simulation, having frequencies of 2.82–3.07 GHz, 1.3–1.4 GHz and 2.38–2.57 GHz, with similar radiation patterns. The measured gain of …

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Improving The Leakage Rate Of Ciphertext-Policy Attribute-Based Encryption For Cloud Computing, Leyou Zhang, Xiaoxu Gao, Fuchun Guo, Gongcheng Hu Jan 2020

Improving The Leakage Rate Of Ciphertext-Policy Attribute-Based Encryption For Cloud Computing, Leyou Zhang, Xiaoxu Gao, Fuchun Guo, Gongcheng Hu

Faculty of Engineering and Information Sciences - Papers: Part B

© 2013 IEEE. A Leakage-Resilient Ciphertext-Policy Attribute-based Encryption (LR-CP-ABE) not only supports the fine-grained access control to encrypted data but also guarantees the security of the data under the side-channel attacks. However, the leakage rate in the existing schemes is low or related to the number of attributes. It will make these schemes suffer from continual attacks. In addition, all of them almost not consider the leakage of the users' privacy and rely on the composite order groups which will threaten the privacy security of the users and depress the users in practice. In this paper, we aim at solving …

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Experimental And Numerical Investigation Of A Method For Strengthening Cold-Formed Steel Profiles In Bending, Ehsan Taheri, Ahmad Firouzianhaji, Peyman Mehrabi, Bahador Vosough Hosseini, Bijan Samali Jan 2020

Experimental And Numerical Investigation Of A Method For Strengthening Cold-Formed Steel Profiles In Bending, Ehsan Taheri, Ahmad Firouzianhaji, Peyman Mehrabi, Bahador Vosough Hosseini, Bijan Samali

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 by the authors. Perforated cold-formed steel (CFS) beams subjected to different bending scenarios should be able to deal with different buckling modes. There is almost no simple way to address this significant concern. This paper investigates the bending capacity and flexural behavior of a noveldesigned system using bolt and nut reinforcing system through both experimental and numerical approaches. For the experiential program, a total of eighteen specimens of three types were manufactured: a non-reinforced section, and two sections reinforced along the upright length at 200 mm and 300 mm pitches. Then, monotonic loading was applied to both the …

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Removal Of Trace Organic Contaminants By Enzymatic Membrane Bioreactors: Role Of Membrane Retention And Biodegradation, Muhammad Bilal Asif, Jingwei Hou, William E. Price, Vicki Chen, Faisal I. Hai Jan 2020

Removal Of Trace Organic Contaminants By Enzymatic Membrane Bioreactors: Role Of Membrane Retention And Biodegradation, Muhammad Bilal Asif, Jingwei Hou, William E. Price, Vicki Chen, Faisal I. Hai

Faculty of Engineering and Information Sciences - Papers: Part B

Performance of an enzymatic membrane bioreactor (EMBR) equipped with either an ultrafiltration (UF) or a nanofiltration (NF) membrane was explored for the degradation of a set of 29 chemically diverse trace organic contaminants (TrOCs). The NF membrane provided effective retention (90-99%) of TrOCs within the NF-EMBR. On the other hand, partial retention of charged and significantly hydrophobic (log >3) TrOCs was achieved by the UF membrane via charge repulsion and adsorption on the enzyme gel-layer formed on the membrane surface during UF-EMBR operation. Laccase achieved TrOC-specific degradation in both EMBRs. The extent of TrOC degradation was significantly (5 to 65%) …

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Biodegradable Prefabricated Vertical Drains: From Laboratory To Field Studies, Thanh Trung Nguyen, Buddhima Indraratna, Pankaj Baral Jan 2020

Biodegradable Prefabricated Vertical Drains: From Laboratory To Field Studies, Thanh Trung Nguyen, Buddhima Indraratna, Pankaj Baral

Faculty of Engineering and Information Sciences - Papers: Part B

Biodegradable prefabricated vertical drains (BPVDs) made from natural fibres have been in use for several decades to improve soft soil, especially in East and Southeast Asia despite the fact that this type of drain has still not been fully addressed and evaluated. This study presents a series of laboratory tests where a drain made from coconut cores wrapped in Indian jute sheath filters is compared to conventional synthetic prefabricated vertical drains (SPVDs). Discharge volume tests are carried out with and without soil clogging to understand how jute drains can resist soil clogging under increasing confining pressure. Along with these macro-hydraulic …

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The Role Of Particle Shape On The Hydraulic Conductivity Of Granular Soils Captured Through Kozeny-Carman Approach, Thanh Trung Nguyen, Buddhima Indraratna Jan 2020

The Role Of Particle Shape On The Hydraulic Conductivity Of Granular Soils Captured Through Kozeny-Carman Approach, Thanh Trung Nguyen, Buddhima Indraratna

Faculty of Engineering and Information Sciences - Papers: Part B

Previous studies indicate that particle shape plays an important role in the hydraulic conductivity (k) of granular materials, often represented through the Kozeny-Carman (KC) concept. Several recent studies have improved the accuracy of the KC approach using the particle size distribution (PSD) to estimate the specific surface area of particles but overly simplifying the effect of particle shape. This current study innovatively adopts the Micro-Computed Tomography (CT) technique to compute particle shape parameters of different granular materials (e.g., glass beads, sand and crushed gravel) and then incorporate these parameters into the KC equation to estimate k more accurately, which is …

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Vortex Dynamics And Fluctuations Of Impinging Planar Jet, Le Quang Phan, Andrew D. Johnstone, Buyung Kosasih, Wayne Renshaw Jan 2020

Vortex Dynamics And Fluctuations Of Impinging Planar Jet, Le Quang Phan, Andrew D. Johnstone, Buyung Kosasih, Wayne Renshaw

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 ISIJ. Smoothness of thin metallic coated strip produced in continuous galvanizing lines is influenced by fluctuations of the impinging wiping pressure. In this paper, vortex dynamics e.g. vortex production frequency and mixing of jet opposing shear layer vortices; and impinging pressure were numerically studied by Large Eddy Simulation (LES). The effects of jet nozzle width, d, and operational parameters (nozzle to strip distance, H, and mean jet velocity, Uo) were investigated. Vortex production rate is almost linearly correlated to Uo and mixing of shear layer vortices occurs when H/d ≥ 6. Dominant frequencies of impinging pressure fluctuation are …

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Microstructure Evolution, Lattice Rotation Retardation And Grain Orientation Fragmentation In Commercial Purity Aluminium Deformed By High Pressure Torsion, Yu Liu, Cheng Lu, Hui Wang, Anh Kiet Tieu, Bin Liu Jan 2020

Microstructure Evolution, Lattice Rotation Retardation And Grain Orientation Fragmentation In Commercial Purity Aluminium Deformed By High Pressure Torsion, Yu Liu, Cheng Lu, Hui Wang, Anh Kiet Tieu, Bin Liu

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 The Authors. The behaviour of commercial purity aluminium processed by high pressure torsion is studied for a wide range of strains. The microstructure and texture are used to characterise the HPT deformation. Two different stages of microstructure evolution, i.e. grain fragmentation and grain elongation, are first found before attainment of steady state during HPT deformation. The grain fragmentation is not a linear function of shear strain in HPT. Significant grain refinement mainly occurs in the equivalent strain ranges of ~0 to 1 and ~11 to 32. Preferred simple shear orientations appear and vanish periodically due to the intrinsic …

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Energy, Exergy And Economic Analyses Of New Coal-Fired Cogeneration Hybrid Plant With Wind Energy Resource, Zhixiong Li, M Ehyaei, A Ahmadi, Dima Jamali, Ranjit Kumar, Stephane Abanades Jan 2020

Energy, Exergy And Economic Analyses Of New Coal-Fired Cogeneration Hybrid Plant With Wind Energy Resource, Zhixiong Li, M Ehyaei, A Ahmadi, Dima Jamali, Ranjit Kumar, Stephane Abanades

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 Elsevier Ltd A novel configuration of a coal-fired cogeneration plant is proposed in this paper. This novel system is composed of combustion chamber, Rankine cycle, absorption chiller, alkaline electrolyzer, and methanation plant. In the proposed configuration, the heat of exhaust gas from the combustion chamber can be used in a Rankine cycle to produce electricity. The heat of exhaust gas also powers the absorption chiller to provide cooling. The exhaust gas flows through a sulfur extraction unit to separate sulfur from CO2 gas. To supply electrical power, wind turbines alongside the Rankine cycle are considered. A part of …

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Analysis Of Wind Load Effect On Key Components In A Jack-Up Offshore Platform, Guijie Liu, Yuanfang Sun, Benlei Zhong, Yingchun Xie, Atilla Incecik, Zhixiong Li Jan 2020

Analysis Of Wind Load Effect On Key Components In A Jack-Up Offshore Platform, Guijie Liu, Yuanfang Sun, Benlei Zhong, Yingchun Xie, Atilla Incecik, Zhixiong Li

Faculty of Engineering and Information Sciences - Papers: Part B

© 2020 Elsevier Ltd In the complex Ocean environment, wind load is the most important factor that should be addressed in the design of jack-up platforms. Although many efforts have been made to analyze the dynamics of jack-up platforms considering wind load effect, literature review shows that very limited work has been done to address the calculation of the wind load coefficient of each individual key component in a platform. Moreover, the influence of different wind speeds and directions under different working conditions of the platforms is not discussed clearly. To this avail, this paper investigates the wind load effect …

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