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Articles 1501 - 1530 of 14367

Full-Text Articles in Social and Behavioral Sciences

Laboratory Investigation Into Biodegradation Of Jute Drains With Implications For Field Behavior, Thanh Trung Nguyen, Buddhima Indraratna, John Philip Carter Jan 2018

Laboratory Investigation Into Biodegradation Of Jute Drains With Implications For Field Behavior, Thanh Trung Nguyen, Buddhima Indraratna, John Philip Carter

Faculty of Engineering and Information Sciences - Papers: Part B

Naturally occurring materials such as jute and coir have some favorable engineering characteristics and also degrade over time, so they have increasingly been used in engineering applications in recent years. The efficient way that naturally prefabricated vertical drains made from those materials help accelerate soil consolidation has been shown in previous studies, but they also tend to decompose rapidly in adverse environments, where cellulose-degrading bacteria cause a serious deterioration of their favorable drainage properties. This study presents a laboratory investigation into the biodegradation of prefabricated vertical jute drains in saturated soft soils, where the tensile strength of jute and coir …

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Experimental Investigation Of Cfrp Confined Hollow Core Reactive Powder Concrete Columns, Muhammad N. S Hadi, Hussamaldeen Goaiz, Tao Yu Jan 2018

Experimental Investigation Of Cfrp Confined Hollow Core Reactive Powder Concrete Columns, Muhammad N. S Hadi, Hussamaldeen Goaiz, Tao Yu

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents an experimental investigation on the behaviour of hollow core Reactive Powder Concrete (HCRPC) columns confined with a circular Carbon-Fibre-Reinforced polymer (CFRP) tube. Sixteen circular hollow core specimens (206 mm in diameter, 800 mm in height and a 90 mm circular hole) were made with Reactive Powder Concrete (RPC) of 105 MPa compressive strength. These specimens were divided into four groups. The first group was the control group that consisted of four unconfined HCRPC specimens reinforced with conventional longitudinal steel bars and steel helices. The specimens of the second group had the same configuration as the first group …

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Investigation Of Track Structure And Condensed History Physics Models For Applications In Radiation Dosimetry On A Micro And Nano Scale In Geant4, Peter Lazarakis, Sebastien Incerti, Vladimir N. Ivanchenko, Ioanna Kyriakou, Dimitris Emfietzoglou, Stephanie Corde, Anatoly B. Rosenfeld, Michael L. F Lerch, Moeava Tehei, Susanna Guatelli Jan 2018

Investigation Of Track Structure And Condensed History Physics Models For Applications In Radiation Dosimetry On A Micro And Nano Scale In Geant4, Peter Lazarakis, Sebastien Incerti, Vladimir N. Ivanchenko, Ioanna Kyriakou, Dimitris Emfietzoglou, Stephanie Corde, Anatoly B. Rosenfeld, Michael L. F Lerch, Moeava Tehei, Susanna Guatelli

Faculty of Engineering and Information Sciences - Papers: Part B

Monte Carlo methods apply various physical models, either condensed history (CH) or track structure (TS), to simulate the passage of radiation through matter. Both CH and TS models continue to be applied to radiation dosimetry investigations on a micro and nano scale. However, as there has been no systematic comparison of the use of these models for such applications there can be no quantification of the uncertainty that is being introduced by the choice of physics model. A comparison of CH and TS models available in Geant4, along with a quantification of the differences in calculated quantities on a micro …

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Data Fusion For Maas: Opportunities And Challenges, Jianqing Wu, Luping Zhou, Chen Cai, Jun Shen, S K. Lau, Jianming Yong Jan 2018

Data Fusion For Maas: Opportunities And Challenges, Jianqing Wu, Luping Zhou, Chen Cai, Jun Shen, S K. Lau, Jianming Yong

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.

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Metamorphic Testing Of Navigation Software: A Pilot Study With Google Maps, Joshua Brown, Zhiquan Zhou, Yang-Wai Chow Jan 2018

Metamorphic Testing Of Navigation Software: A Pilot Study With Google Maps, Joshua Brown, Zhiquan Zhou, Yang-Wai Chow

Faculty of Engineering and Information Sciences - Papers: Part B

Millions of people use navigation software every day to commute and travel. In addition, many systems rely upon the correctness of navigation software to function, ranging from directions applications to self-driving machinery. Navigation software is difficult to test because it is hard or very expensive to evaluate its output. This difficulty is generally known as the oracle problem, a fundamental challenge in software testing. In this study, we propose a metamorphic testing strategy to alleviate the oracle problem in testing navigation software, and conduct a case study by testing the Google Maps mobile app, its web service API, and its …

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Combinatorial Algorithms And Methods For Security Of Statistical Databases Related To The Work Of Mirka Miller, A V. Kelarev, Jennifer Seberry, Leanne Rylands, Xun Yi Jan 2018

Combinatorial Algorithms And Methods For Security Of Statistical Databases Related To The Work Of Mirka Miller, A V. Kelarev, Jennifer Seberry, Leanne Rylands, Xun Yi

Faculty of Engineering and Information Sciences - Papers: Part B

This article gives a survey of combinatorial algorithms and methods for database security related to the work of Mirka Miller. The main contributions of Mirka Miller and coauthors to the security of statistical databases include the introduction of Static Audit Expert and theorems determining time complexity of its combinatorial algorithms, a polynomial time algorithm for deciding whether the maximum possible usability can be achieved in statistical database with a special class of answerable statistics, NP-completeness of similar problems concerning several other types of databases, sharp upper bounds on the number of compromise-free queries in certain categories of statistical databases, and …

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Depth Pooling Based Large-Scale 3-D Action Recognition With Convolutional Neural Networks, Pichao Wang, Wanqing Li, Zhimin Gao, Chang Tang, Philip O. Ogunbona Jan 2018

Depth Pooling Based Large-Scale 3-D Action Recognition With Convolutional Neural Networks, Pichao Wang, Wanqing Li, Zhimin Gao, Chang Tang, Philip O. Ogunbona

Faculty of Engineering and Information Sciences - Papers: Part B

1999-2012 IEEE. This paper proposes three simple, compact yet effective representations of depth sequences, referred to respectively as dynamic depth images (DDI), dynamic depth normal images (DDNI), and dynamic depth motion normal images (DDMNI), for both isolated and continuous action recognition. These dynamic images are constructed from a segmented sequence of depth maps using hierarchical bidirectional rank pooling to effectively capture the spatial-temporal information. Specifically, DDI exploits the dynamics of postures over time, and DDNI and DDMNI exploit the 3-D structural information captured by depth maps. Upon the proposed representations, a convolutional neural network (ConvNet)-based method is developed for action …

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Embedding And Extension Properties Of Hadamard Matrices Revisited, Dimitrios Christou, Marilena Mitrouli, Jennifer Seberry Jan 2018

Embedding And Extension Properties Of Hadamard Matrices Revisited, Dimitrios Christou, Marilena Mitrouli, Jennifer Seberry

Faculty of Engineering and Information Sciences - Papers: Part B

2018 2018. Hadamard matrices have many applications in several mathematical areas due to their special form and the numerous properties that characterize them. Based on a recently developed relation between minors of Hadamard matrices and using tools from calculus and elementary number theory, this work highlights a direct way to investigate the conditions under which an Hadamard matrix of order n - k can or cannot be embedded in an Hadamard matrix of order n. The results obtained also provide answers to the problem of determining the values of the spectrum of the determinant function for specific orders of minors …

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Research On Flow Field Perception Based On Artificial Lateral Line Sensor System, Guijie Liu, Mengmeng Wang, Anyi Wang, Shirui Wang, Tingting Yang, Reza Malekian, Zhixiong Li Jan 2018

Research On Flow Field Perception Based On Artificial Lateral Line Sensor System, Guijie Liu, Mengmeng Wang, Anyi Wang, Shirui Wang, Tingting Yang, Reza Malekian, Zhixiong Li

Faculty of Engineering and Information Sciences - Papers: Part B

In nature, the lateral line of fish is a peculiar and important organ for sensing the surrounding hydrodynamic environment, preying, escaping from predators and schooling. In this paper, by imitating the mechanism of fish lateral canal neuromasts, we developed an artificial lateral line system composed of micro-pressure sensors. Through hydrodynamic simulations, an optimized sensor structure was obtained and the pressure distributionmodels of the lateral surfacewere established in uniformflowand turbulent flow. Carrying out the corresponding underwater experiment, the validity of the numerical simulation method is verified by the comparison between the experimental data and the simulation results. In addition, a variety …

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The Influence Of Rubber Crumbs On The Energy Absorbing Property Of Waste Mixtures, Yujie Qi, Buddhima Indraratna, Ana Heitor, J S. Vinod Jan 2018

The Influence Of Rubber Crumbs On The Energy Absorbing Property Of Waste Mixtures, Yujie Qi, Buddhima Indraratna, Ana Heitor, J S. Vinod

Faculty of Engineering and Information Sciences - Papers: Part B

The practical application of waste materials such as steel furnace slag (SFS) and coal wash (CW) is becoming more prevalent in civil engineering. While the addition of rubber crumbs (RC) derived from waste tyres can influence the geotechnical properties of the mixtures of SFS and CW significantly, especially the energy absorbing property. In this paper, the energy absorbing property of the SFS+CW+RC mixtures under static loading has been evaluated by the strain energy density. As expected, the energy absorbing capacity of the waste mixture increases with the addition of RC.To further illustrate the influence of rubber crumbs on the energy …

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Anaerobic Digestion Of Soft Drink Beverage Waste And Sewage Sludge, John Wickham, Sihuang Xie, Brendan R. Galway, Heriberto A. Bustamante, Long D. Nghiem Jan 2018

Anaerobic Digestion Of Soft Drink Beverage Waste And Sewage Sludge, John Wickham, Sihuang Xie, Brendan R. Galway, Heriberto A. Bustamante, Long D. Nghiem

Faculty of Engineering and Information Sciences - Papers: Part B

Soft drink beverage waste (BW) was evaluated as a potential substrate for anaerobic co-digestion with sewage sludge to increase biogas production. Results from this study show that the increase in biogas production is proportional to the increase in organic loading rate (OLR) rate due to BW addition. The OLR increase of 86 and 171% corresponding to 10 and 20% BW by volume in the feed resulted in 89 and 191% increase in biogas production, respectively. Under a stable condition, anaerobic co-digestion with BW did not lead to any significant impact on digestate quality (in terms of COD removal and biosolids …

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Compressive Test Of Gfrp-Recycled Aggregate Concrete-Steel Tubular Long Columns, Lan Zeng, L J. Li, Zhi Su, Feng Liu Jan 2018

Compressive Test Of Gfrp-Recycled Aggregate Concrete-Steel Tubular Long Columns, Lan Zeng, L J. Li, Zhi Su, Feng Liu

Faculty of Engineering and Information Sciences - Papers: Part B

In order to alleviate the problem of growing construction waste and utilize the favorable material properties of fibre-reinforced polymer (FRP), a novel form of composites, FRP-recycled aggregate concrete-steel columns (FRSCs), was proposed based on hybrid FRP-concrete-steel double-skin tubular columns (DSTCs). The composite of FRSC consists an outer FRP tube and an inner steel tube with an annular area of recycled aggregate concrete (RAC) filled between both tubes. To further investigate the compressive behavior of these composites, an experiment of Glass FRP-RAC-steel tubular long columns (FRSLCs) was performed subjected to monotonic axial compression. Three parameters were designed in the test, which …

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Dynamic Properties Of Mixtures Of Waste Materials, Yujie Qi, Buddhima Indraratna, J S. Vinod Jan 2018

Dynamic Properties Of Mixtures Of Waste Materials, Yujie Qi, Buddhima Indraratna, J S. Vinod

Faculty of Engineering and Information Sciences - Papers: Part B

The stockpiling of waste mining by-products, i.e. steel furnace slag (SFS) and coal wash (CW) has brought significant environmental hazard and attracted research attention to reuse them in a more innovative way. In recent years, SFS+CW mixtures have been successfully applied in geotechnical projects, while the inclusion of rubber crumb (RC, from waste tyres) will extend them into dynamic projects. Thus the investigation of the geotechnical properties of SFS+CW+RC mixtures under dynamic loading is in urgent need. In this paper, the dynamic properties (i.e. shear modulus and damping ratio) have been explored based on extensive drained cyclic triaxial tests. The …

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Flow Partitioning In Rectangular Open Channel Flow, Yu Han, Shu-Qing Yang, Muttucumaru Sivakumar, Liu-Chao Qiu, Jian Chen Jan 2018

Flow Partitioning In Rectangular Open Channel Flow, Yu Han, Shu-Qing Yang, Muttucumaru Sivakumar, Liu-Chao Qiu, Jian Chen

Faculty of Engineering and Information Sciences - Papers: Part B

Hydraulic engineers often divide a flow region into subregions to simplify calculations. However, the implementation of flow divisibility remains an open issue and has not yet been implemented as a fully developed mathematical tool for modeling complex channel flows independently of experimental verification. This paper addresses whether a three-dimensional flow is physically divisible, meaning that division lines with zero Reynolds shear stress exist. An intensive laboratory investigation was conducted to carefully measure the time-averaged velocity in a rectangular open channel flow using a laser Doppler anemometry system. Two innovative methods are employed to determine the locations of division lines based …

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Design, Fabrication, And Test Of A Coupled Parametric-Transverse Nonlinearly Broadband Energy Harvester, Thomas Searle, Tanju Yildirim, Mergen H. Ghayesh, Weihua Li, Gursel Alici Jan 2018

Design, Fabrication, And Test Of A Coupled Parametric-Transverse Nonlinearly Broadband Energy Harvester, Thomas Searle, Tanju Yildirim, Mergen H. Ghayesh, Weihua Li, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part B

A coupled parametric-transverse nonlinearly broadband energy harvester utilizing mechanical stoppers has been designed, fabricated, experimentally tested, and in some cases theoretically verified. An energy harvester with coupled parametric and transverse cantilever beams with additional tip-masses was excited using an electrodynamic shaker. A piezoelectric bimorph has been attached to each cantilever beam; when the excitation frequency was in the vicinity of the parametric or transverse resonances, the mechanical strain developed in the piezo-bimorphs was converted into electrical energy across a purely resistive ac load. For the cases involving no stoppers, a weak softening-type nonlinear frequency-voltage behavior was observed for the parametrically …

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A Wheeled Robot Driven By A Liquid-Metal Droplet, Jian Wu, Shiyang Tang, Tao Fang, Weihua Li, Xiangpeng Li, Shiwu Zhang Jan 2018

A Wheeled Robot Driven By A Liquid-Metal Droplet, Jian Wu, Shiyang Tang, Tao Fang, Weihua Li, Xiangpeng Li, Shiwu Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

The controlled actuation of gallium liquid-metal (LM) alloys has presented new and exciting opportunities for constructing mobile robots with structural flexibility. However, the locomotion of current LM-based actuators often relies on inducing a gradient of interfacial tension on the LM surface within electrolytes, which limits their application outside a liquid environment. In this work, a wheeled robot using a LM droplet as the core of the driving system is developed that enables it to move outside liquid environment. The LM droplet inside the robot is actuated using a voltage to alter the robot's center of gravity, which in turn generates …

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Parsimonious Network Based On A Fuzzy Inference System (Panfis) For Time Series Feature Prediction Of Low Speed Slew Bearing Prognosis, Wahyu Caesarendra, Mahardhika Pratama, Buyung Kosasih, Tegoeh Tjahjowidodo, Adam Glowacz Jan 2018

Parsimonious Network Based On A Fuzzy Inference System (Panfis) For Time Series Feature Prediction Of Low Speed Slew Bearing Prognosis, Wahyu Caesarendra, Mahardhika Pratama, Buyung Kosasih, Tegoeh Tjahjowidodo, Adam Glowacz

Faculty of Engineering and Information Sciences - Papers: Part B

In recent years, the utilization of rotating parts, e.g., bearings and gears, has been continuously supporting the manufacturing line to produce a consistent output quality. Due to their critical role, the breakdown of these components might significantly impact the production rate. Prognosis, which is an approach that predicts the machine failure, has attracted significant interest in the last few decades. In this paper, the prognostic approaches are described briefly and advanced predictive analytics, namely a parsimonious network based on a fuzzy inference system (PANFIS), is proposed and tested for low speed slew bearing data. PANFIS differs itself from conventional prognostic …

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A Hierarchical Statistical Framework For Emergent Constraints: Application To Snow-Albedo Feedback, Kevin W. Bowman, Noel A. Cressie, Xin Qu, Alex Hall Jan 2018

A Hierarchical Statistical Framework For Emergent Constraints: Application To Snow-Albedo Feedback, Kevin W. Bowman, Noel A. Cressie, Xin Qu, Alex Hall

Faculty of Engineering and Information Sciences - Papers: Part B

Emergent constraints use relationships between future and current climate states to constrain projections of climate response. Here we introduce a statistical, hierarchical emergent constraint (HEC) framework in order to link future and current climates with observations. Under Gaussian assumptions, the mean and variance of the future state are shown analytically to be a function of the signal-to-noise ratio between current climate uncertainty and observation error and the correlation between future and current climate states. We apply the HEC to the climate change, snow-albedo feedback, which is related to the seasonal cycle in the Northern Hemisphere. We obtain a snow-albedo feedback …

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Cca-Secure Revocable Identity-Based Encryption With Ciphertext Evolution In The Cloud, Yinxia Sun, Willy Susilo, Futai Zhang, Anmin Fu Jan 2018

Cca-Secure Revocable Identity-Based Encryption With Ciphertext Evolution In The Cloud, Yinxia Sun, Willy Susilo, Futai Zhang, Anmin Fu

Faculty of Engineering and Information Sciences - Papers: Part B

Identity-based encryption (IBE) is a very attractive cryptographic primitive due to its unnecessity of any certificate managements. Nevertheless, the user revocation problem in IBE remains an elusive research problem and hence, it is an important research topic. One possible approach in achieving revocations is to update user’s decryption keys. However, to avoid the need of secret channels, public time keys need to be issued to allow this update to occur. It is unfortunate that this method often suffers from two problems: 1) the user has to maintain linearly growing decryption keys; and 2) the revoked users can still access ciphertexts …

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A New Phase Unwrapping Method For Phase Shifting Profilometry With Object In Motion, Zhaoyi Jia, Lei Lu, Chunhua Zhu, Yinsen Luan, Jiangtao Xi Jan 2018

A New Phase Unwrapping Method For Phase Shifting Profilometry With Object In Motion, Zhaoyi Jia, Lei Lu, Chunhua Zhu, Yinsen Luan, Jiangtao Xi

Faculty of Engineering and Information Sciences - Papers: Part B

Phase unwrapping is an important step for the phase shifting profilometry. The dual-frequency phase unwrapping method can unwrap the object with discontinues when the object is static by employing more fringe patterns. However, errors will occur when moving object is reconstructed. In this paper, a new phase unwrapping method with dual-frequency phase unwrapping method for the moving object measurement is proposed. The fringe pattern with low fringe pattern and high frequency are projected onto the moving object surface. Then, the phase values are retrieved for the two frequencies respectively. The relationship between the movement and phase value is analyzed and …

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Time-Of-Flight Spectrometry Of Ultra-Short, Polyenergetic Proton Bunches, Matthias Wurl, Franz Englbrecht, Sebastian Lehrack, Chiara Gianoli, Florian Lindner, Thomas Rosch, Daniel Haffa, Francesco Olivari, Marco Petasecca, Michael L. F Lerch, Alex Pogossov, Linh T. Tran, Walter Assmann, Jorg Schreiber, Anatoly B. Rosenfeld, Katia Parodi Jan 2018

Time-Of-Flight Spectrometry Of Ultra-Short, Polyenergetic Proton Bunches, Matthias Wurl, Franz Englbrecht, Sebastian Lehrack, Chiara Gianoli, Florian Lindner, Thomas Rosch, Daniel Haffa, Francesco Olivari, Marco Petasecca, Michael L. F Lerch, Alex Pogossov, Linh T. Tran, Walter Assmann, Jorg Schreiber, Anatoly B. Rosenfeld, Katia Parodi

Faculty of Engineering and Information Sciences - Papers: Part B

A common approach for spectrum determination of polyenergetic proton bunches from laser-ion acceleration experiments is based on the time-of-flight (TOF) method. However, spectra obtained using this method are typically given in relative units or are estimated based on some prior assumptions on the energy distribution of the accelerated ions. In this work, we present a new approach using the TOF method that allows for an absolute energy spectrum reconstruction from a current signal acquired with a sub-nanosecond fast and 10 μm thin silicon detector. The reconstruction is based on solving a linear least-squares problem, taking into account the response function …

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Development Of A New Geant4-Dna Electron Elastic Scattering Model For Liquid-Phase Water Using The Elsepa Code, W Shin, M Bordage, Dimitris Emfietzoglou, Ioanna Kyriakou, Dosatsu Sakata, C Min, Sang Bae Lee, Susanna Guatelli, Sebastien Incerti Jan 2018

Development Of A New Geant4-Dna Electron Elastic Scattering Model For Liquid-Phase Water Using The Elsepa Code, W Shin, M Bordage, Dimitris Emfietzoglou, Ioanna Kyriakou, Dosatsu Sakata, C Min, Sang Bae Lee, Susanna Guatelli, Sebastien Incerti

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents the calculation of new elastic scattering cross sections for the simulation of electron interactions in liquid water. The calculations are based on the "ELastic Scattering of Electrons and Positrons by neutral Atoms" code, which adopts a Dirac partial wave analysis. A Muffin-tin potential was used in order to account for the liquid-phase of water, and the optical parameters of the correlation-polarization and the inelastic absorption potentials were optimized against vapour-phase water data. The differential and total elastic scattering cross sections calculated in the present work show a global agreement with the experimental data. The impact of these …

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Stable Quantitative Resistance Loci To Blackleg Disease In Canola (Brassica Napus L.) Over Continents, Harsh Raman, Rosy Raman, Simon M. Diffey, Yu Qiu, Brett Mcvittie, Denise Barbulescu, Phil Salisbury, S J. Marcroft, Regine Delourme Jan 2018

Stable Quantitative Resistance Loci To Blackleg Disease In Canola (Brassica Napus L.) Over Continents, Harsh Raman, Rosy Raman, Simon M. Diffey, Yu Qiu, Brett Mcvittie, Denise Barbulescu, Phil Salisbury, S J. Marcroft, Regine Delourme

Faculty of Engineering and Information Sciences - Papers: Part B

The hemibiotrophic fungus, Leptosphaeria maculans is the most devastating pathogen, causing blackleg disease in canola (Brassica napus L). To study the genomic regions involved in quantitative resistance (QR), 259-276 DH lines from Darmor-bzh/Yudal (DYDH) population were assessed for resistance to blackleg under shade house and field conditions across 3 years. In different experiments, the broad sense heritability varied from 43 to 95%. A total of 27 significant quantitative trait loci (QTL) for QR were detected on 12 chromosomes and explained between 2.14 and 10.13% of the genotypic variance. Of the significant QTL, at least seven were repeatedly detected across different …

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Analysis Of Springback Behaviour In Micro Flexible Rolling Of Crystalline Materials, Feijun Qu, Zhengyi Jiang, Xiaogang Wang, Cunlong Zhou Jan 2018

Analysis Of Springback Behaviour In Micro Flexible Rolling Of Crystalline Materials, Feijun Qu, Zhengyi Jiang, Xiaogang Wang, Cunlong Zhou

Faculty of Engineering and Information Sciences - Papers: Part B

,is paper presents a constitutive modelling of the polycrystalline thin metal strip under a state of combined loading in microflexible rolling. ,e concept of grained inhomogeneity is incorporated into the classic Chaboche hardening model that accounts for the Bauschinger effect, in order to provide more precise description and analysis of the springback mechanism in the particular forming operation. ,e model is first implemented in the finite element program ABAQUS to numerically predict the stress-strain relationship of 304 stainless steel specimens over a range of average grain sizes. After validation of the developed model by comparison of predicted curves and actual …

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Numerical Study On Springback Prediction Of Aged Steel Based On Quasi-Static Strain-Hardening Material Model, Yong Sun, Feijun Qu, Ziliu Xiong, Shichao Ding Jan 2018

Numerical Study On Springback Prediction Of Aged Steel Based On Quasi-Static Strain-Hardening Material Model, Yong Sun, Feijun Qu, Ziliu Xiong, Shichao Ding

Faculty of Engineering and Information Sciences - Papers: Part B

Material model of aged steel, the material's stress and strain behavior in the region of yielding, plays a critical role in springback prediction of FEA simulation. In most of the FEA simulations, the material is modeled as a linear elastic and then after yielding, a linear strain-hardening model or a power-law strain-hardening model. In the prediction of springback by FEA simulation, there is always a problem that the prediction is far away to the true springback of the products or samples. This paper employs a quasi-static strain-hardening material model which gives a more accurate description of the material properties of …

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Mathematical Modelling Of The Removal Of Organic Micropollutants In The Activated Sludge Process: A Linear Biodegradation Model, Mark Nelson, Rubayyi T. Alqahtani, Faisal I. Hai Jan 2018

Mathematical Modelling Of The Removal Of Organic Micropollutants In The Activated Sludge Process: A Linear Biodegradation Model, Mark Nelson, Rubayyi T. Alqahtani, Faisal I. Hai

Faculty of Engineering and Information Sciences - Papers: Part B

Before wastewaters can be released into the environment, they must be treated to reduce the concentration of organic pollutants in the effluent stream. There is a growing concern as to whether wastewater treatment plants are able to effectively reduce the concentration of micropollutants that are also contained in their influent streams. We investigate the removal of micropollutants in treatment plants by analysing a model that includes biodegradation and sorption as the main mechanisms of micropollutant removal. For the latter a linear adsorption model is used in which adsorption only occurs onto particulates.The steady-state solutions of the model are found and …

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The K-Theory Of Twisted Multipullback Quantum Odd Spheres And Complex Projective Spaces, Piotr M. Hajac, Ryszard Nest, David Pask, Aidan Sims, Bartosz Zielinski Jan 2018

The K-Theory Of Twisted Multipullback Quantum Odd Spheres And Complex Projective Spaces, Piotr M. Hajac, Ryszard Nest, David Pask, Aidan Sims, Bartosz Zielinski

Faculty of Engineering and Information Sciences - Papers: Part B

We find multipullback quantum odd-dimensional spheres equipped with natural U.1/-actions that yield the multipullback quantum complex projective spaces constructed from Toeplitz cubes as noncommutative quotients. We prove that the noncommutative line bundles associated to multipullback quantum odd spheres are pairwise stably non-isomorphic, and that the K-groups of multipullback quantum complex projective spaces and odd spheres coincide with their classical counterparts.We show that theseK-groups remain the same for more general twisted versions of our quantum odd spheres and complex projective spaces.

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Shear Modulus Of Sand-Tyre Chip Mixtures, Maria Mashiri, J S. Vinod, M Neaz Sheikh, J. Antonio H. Carraro Jan 2018

Shear Modulus Of Sand-Tyre Chip Mixtures, Maria Mashiri, J S. Vinod, M Neaz Sheikh, J. Antonio H. Carraro

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents experimental results on the shear modulus of sand-tyre chip (STCh) mixtures. A series of bender element tests was carried out on specimens of sand mixed with varying proportions of tyre chips (TCh). Tests were carried out on STCh mixtures at a constant initial relative density of 50% for different initial effective confining pressures. The bender element test results indicate that the maximum shear modulus of the STCh mixtures increases with effective confining pressure and decreases with the gravimetric proportion of TCh, which ranged from 23 to 138 kPa and 0 to 40%, respectively. However, the strain-controlled cyclic …

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Measurement Of Microsurface Topography Using A Self-Mixing Optical Configuration, Xiaohong Sun, Han Wang, Bin Liu, Yanguang Yu Jan 2018

Measurement Of Microsurface Topography Using A Self-Mixing Optical Configuration, Xiaohong Sun, Han Wang, Bin Liu, Yanguang Yu

Faculty of Engineering and Information Sciences - Papers: Part B

This work proposes to measure the topography of microstructure surfaces using a self-mixing interference (SMI) configuration. The theoretical measurement model is built using beam-expanded plane wave method and considering SMI effect. The interference patterns for different objects are obtained based on the presented model. In addition, an algorithm for reconstructing the three-dimensional surface is implemented and applied onto an object with spherical surface. The presented work shows the potential application for topography measurement using a compact SMI configuration.

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A Closer Look On Spatiotemporal Variations Of Dissolved Oxygen In Waste Stabilization Ponds Using Mixed Models, Long Ho, Duy Pham, Wout Van Echelpoel, Leacky Muchene, Ziv Shkedy, Andres Alvarado, Juan Espinoza-Palacios, Maria Arevalo-Durazno, Olivier Thas, Peter L. M Goethals Jan 2018

A Closer Look On Spatiotemporal Variations Of Dissolved Oxygen In Waste Stabilization Ponds Using Mixed Models, Long Ho, Duy Pham, Wout Van Echelpoel, Leacky Muchene, Ziv Shkedy, Andres Alvarado, Juan Espinoza-Palacios, Maria Arevalo-Durazno, Olivier Thas, Peter L. M Goethals

Faculty of Engineering and Information Sciences - Papers: Part B

Dissolved oxygen is an essential controlling factor in the performance of facultative and maturation ponds since both take many advantages of algal photosynthetic oxygenation. The rate of this photosynthesis strongly depends on the time during the day and the location in a pond system, whose roles have been overlooked in previous guidelines of pond operation and maintenance (O&M). To elucidate these influences, a linear mixed effect model (LMM) was built on the data collected from three intensive sampling campaigns in a waste stabilization pond in Cuenca, Ecuador. Within two parallel lines of facultative and maturation ponds, nine locations were sampled …

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