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Full-Text Articles in Engineering
Effect Of Grain Size On The Hydrogen Diffusion Process In Steel Using Cellular Automaton Approach, Druce P. Dunne, E V. Pereloma, Nima Yazdipour
Effect Of Grain Size On The Hydrogen Diffusion Process In Steel Using Cellular Automaton Approach, Druce P. Dunne, E V. Pereloma, Nima Yazdipour
Faculty of Engineering - Papers (Archive)
The role of microstructure in susceptibility to hydrogen uptake and property degradation is being evaluated using a number of high strength pipeline steels. To do so, a cellular automaton (CA) model has been used to examine the effect of grain size, as a first step in assessing the influence of microstructure. The simulation results of hydrogen diffusion into microstructures with different grain sizes are presented.
Improvement Of Rock Bolt Profiles Using Analytical And Numerical Methods, Chen Cao, Jan Anton Nemcik, Najdat I. Aziz
Improvement Of Rock Bolt Profiles Using Analytical And Numerical Methods, Chen Cao, Jan Anton Nemcik, Najdat I. Aziz
Faculty of Engineering - Papers (Archive)
The anchorage capacity of fully grouted bolts has been studied for many years, however the bolt rib profile and its effect on bolt shear resistance is poorly understood. A new development in calculating load transfer capacity between two rib profiles of varying geometries is discussed. The derived mathematical equations presented calculate the stress distribution adjacent to the fully grouted bolt and bolt pull out force needed to fail the resin. The Fast Lagrangian Analysis Continua (FLAC) program was used to verify the calculations of stress within the resin. The novel idea of coupling the bolt geometry with the calculated stress …
Dosimetry Verification In Eye Brachytherapy Using Silicon Pixelated Detectors, Michael Weaver, Marco Petasecca, Michael L. Lerch, Dean L. Cutajar, J Jakubek, S Pospsil, Anatoly B. Rosenfeld
Dosimetry Verification In Eye Brachytherapy Using Silicon Pixelated Detectors, Michael Weaver, Marco Petasecca, Michael L. Lerch, Dean L. Cutajar, J Jakubek, S Pospsil, Anatoly B. Rosenfeld
Faculty of Engineering - Papers (Archive)
This study presents a high spatial resolution dosimetry system for quality assurance of I-125 eye plaques. The system is based on a silicon pixelated detector and is capable of deriving 3D dose distributions. A simple design was implemented, incorporating a movable eye plaque in a small water phantom above the silicon Medipix2 detector. It is designed for obtaining 2D dose distributions at different depths in water, for subsequent 3D dose mapping. The effect of backscattering in a medium placed behind the Medipix2 to simulate surrounding tissue has been studied in terms of dose distribution. Additionally, two modes of acquisition, event …
Treatment Of Saline Aqueous Solutions Using Direct Contact Membrane Distillation, Long Nghiem, Florian Hildinger, Faisal I. Hai, Tzahi Cath
Treatment Of Saline Aqueous Solutions Using Direct Contact Membrane Distillation, Long Nghiem, Florian Hildinger, Faisal I. Hai, Tzahi Cath
Faculty of Engineering - Papers (Archive)
The treatment of highly saline aqueous solutions using direct contact membrane distillation (DCMD) was evaluated in this study. Experiments were conducted using a flat sheet polytetrafluoroethylene membrane with nominal pore size of 0.22 µm. Seawater, reverse osmosis (RO) concentrate collected from a wastewater reclamation plant, and a synthetic solution containing 2,000 mg/L of CaSO4 were selected as the representative saline solutions. A gradual decline in permeate flux was observed at the beginning of the experiments when the seawater and RO concentrate solutions were treated using the DCMD process, most likely due to initial organic fouling and scaling. In contrast, …
Characterization Of The Bake-Hardening Behavior Of Transformation Induced Plasticity And Dual-Phase Steels Using Advanced Analytical Techniques, Ilana Timokhina, E V. Pereloma, S P. Ringer, Rongkun Zheng, Peter D. Hodgson
Characterization Of The Bake-Hardening Behavior Of Transformation Induced Plasticity And Dual-Phase Steels Using Advanced Analytical Techniques, Ilana Timokhina, E V. Pereloma, S P. Ringer, Rongkun Zheng, Peter D. Hodgson
Faculty of Engineering - Papers (Archive)
The bake-hardening (BH) behavior of TRansformation Induced Plasticity (TRIP) and Dual-Phase (DP) steels after intercritical annealing (IA) has been studied using transmission electron microscopy, X-ray diffraction and three dimensional atom probe tomography. It was found for the DP steel that carbon can segregate to dislocations in the ferrite plastic deformation zones where there is a high dislocation density around the “as-quenched” martensite. The carbon pinning of these dislocations, in turn, increases the yield strength after aging. It was shown that bake-hardening also leads to rearrangement of carbon in the martensite leading to the formation of rod-like low temperature carbides in …
Preparation Of Titanium Dioxide Nanoparticles From Electrocoagulated Sludge Using Sacrificial Titanium Electrodes, H K. Shon, S Phuntsho, S Vigneswaran, Jaya Kandasamy, Long Nghiem, G J. Kim, J B. Kim, Jin-Ho Kim
Preparation Of Titanium Dioxide Nanoparticles From Electrocoagulated Sludge Using Sacrificial Titanium Electrodes, H K. Shon, S Phuntsho, S Vigneswaran, Jaya Kandasamy, Long Nghiem, G J. Kim, J B. Kim, Jin-Ho Kim
Faculty of Engineering - Papers (Archive)
A comprehensive investigation of electrocoagulation using sacrificial titanium (Ti) electrodes in wastewater was carried out. The effects of specific process variables, such as initial pH, mixing, current density, initial organic loading, and ionic/electrolyte strength were first optimized to produce recyclable Ti-based sludge. The sludge was incinerated at 600 °C to produce functional TiO2 photocatalyst. X-ray diffraction analysis revealed that TiO2 produced at optimum electrocoagulation conditions was mostly anatase structure. The specific surface area of the synthesized TiO2 photocatalyst was higher than that of the commercially available and widely used Degussa P-25 TiO2. Furthermore, energy dispersive …
Simulation Of Impulsive Loading On Column Using Inflatable Airbag Technique, Alexander Remennikov, J Y Richard Liew, Kong Sih Ying, K W. Kang
Simulation Of Impulsive Loading On Column Using Inflatable Airbag Technique, Alexander Remennikov, J Y Richard Liew, Kong Sih Ying, K W. Kang
Faculty of Engineering - Papers (Archive)
The purpose of this study was to simulate impulsive loading on columns by an innovative lab-based experimental technique that utilises inflatable airbags. Mild and stainless steel hollow sectioin columns with effective lengths of 955mm and under simply supported condition were used in this study.
Ybco Film With Sm Addition Using Low-Fluorine Tfa-Mod Approach, Dongqi Shi, Lin Wang, Jung Ho Kim, Xuebin Zhu, Min Liu, Qi Li, Rong Zeng, Jyhuan Ahn, S. X. Dou, J. Y. Yoo, Y. K. Kim, T. Yamashita, John Barry, Richard Taylor
Ybco Film With Sm Addition Using Low-Fluorine Tfa-Mod Approach, Dongqi Shi, Lin Wang, Jung Ho Kim, Xuebin Zhu, Min Liu, Qi Li, Rong Zeng, Jyhuan Ahn, S. X. Dou, J. Y. Yoo, Y. K. Kim, T. Yamashita, John Barry, Richard Taylor
Faculty of Engineering - Papers (Archive)
Yttrium barium copper oxide (YBCO) film was synthesized by a metal-organic deposition (MOD) process with fluorine-free Y and Cu precursor. The precursor solution with Sm addition enabled further improvement of the thickness and uniformity of precursor films. The calcination and firing processes were studied, and the precursor film was successfully converted to dense and uniform YBCO film on LaAlO3 (LAO) substrate after annealing in a wet Ar and O2 atmosphere. The measured critical current density (J c) value was about 80 A/cm-w (2.66 MA/cm2). The trifluoroacetate (TFA) reduced MOD process has the advantage that …
Optimal Area Covering Using Genetic Algorithms, Paulo A. Jimenez, Bijan Shirinzadeh, Ann Nicholson, Gursel Alici
Optimal Area Covering Using Genetic Algorithms, Paulo A. Jimenez, Bijan Shirinzadeh, Ann Nicholson, Gursel Alici
Faculty of Engineering - Papers (Archive)
Path planning problems involve computing or finding a collision free path between two positions. A special kind of path planning is complete coverage path planning, where a robot sweeps all area of free space in an environment. There are different methods to cover the complete area; however, they are not designed to optimize the process. This paper proposes a novel method of complete coverage path planning based on genetic algorithms. In order to check the viability of this approach the optimal path is tested in a virtual environment. The simulation results confirm the feasibility of this method.
De-Convolution Of Time-Series Data Using Translational Symmetry And Eigenstate Analysis, Craig Moodie, A. K. Tieu, Simon Biddle
De-Convolution Of Time-Series Data Using Translational Symmetry And Eigenstate Analysis, Craig Moodie, A. K. Tieu, Simon Biddle
Faculty of Engineering - Papers (Archive)
Translational Symmetry permits a time invariant matrix (a Ring Matrix) of a time series to be formed. Traditional Eigenvalue/vector and Fast Fourier Transform techniques applied to the Ring Matrix provide views of all the vibration modes, their magnitude and frequency content. The Ring Matrix has many interesting features associated with it that enable it to be used as an additional tool in defining the ‘condition state’ of a bearing. This paper introduces the Ring Matrix as a significant step in the ‘Blind’ deconvolution process. Application of the de-convolution method to vibration data obtained from both a large and small slow …
Distributed Mimo Systems Using Asterism Decoding, Phillip Conder, Jason Gao, Mehran Abolhasan
Distributed Mimo Systems Using Asterism Decoding, Phillip Conder, Jason Gao, Mehran Abolhasan
Faculty of Engineering - Papers (Archive)
Multiple Input Multiple Output (MIMO) systems have received enormous attention by researchers as they can provide a roughly linear increase in capacity of wireless communications systems by using multiple transmit and receive antennas. Even with the larger raw data rates provided by MIMO, the throughput of these systems can be limited by the number of users (or networks) sharing the medium. This paper shows how multiple users (or networks) transmitting simultaneously can be represented as a MIMO system with a larger number of transmit than receive antennas. After reviewing existing decoders for such a MIMO system, this paper then proposes …
Discrete Cosine Transform Based Shift Estimation For Fringe Pattern Profilometry Using Generalized Analysis Model, Jose F. Chicharo, Jiangtao Xi, Yingsong Hu, Zongkai Yang, Enbang Li
Discrete Cosine Transform Based Shift Estimation For Fringe Pattern Profilometry Using Generalized Analysis Model, Jose F. Chicharo, Jiangtao Xi, Yingsong Hu, Zongkai Yang, Enbang Li
Faculty of Engineering - Papers (Archive)
This paper presents a new analysis algorithm to carry out profile measure- ment with low computational complexity and less noise-sensitivity. Firstly, a discrete cosine transform (DCT) based representation method is introduced to express the height distribution of the three-dimensional surface. Then, a novel shift estimation algorithm, called DCT based shift estimation (DCT-SE) is presented to reconstruct three-dimensional object surfaces by using the proposed expression and the generalized analysis model. The advantage of DCT-SE is that without loss of measurement precise it provides lower computational complexity to implement three-dimensional reconstruction from distorted fringe patterns and at the same time survives from …
Extraction And Transport Of Metal Ions And Small Organic Com#163s Using Polymer Inclusion Membranes (Pims), Long Nghiem, Patrick Mornane, Ian Potter, Jilska Perera, Robert Cattral, Spas Kolev
Extraction And Transport Of Metal Ions And Small Organic Com#163s Using Polymer Inclusion Membranes (Pims), Long Nghiem, Patrick Mornane, Ian Potter, Jilska Perera, Robert Cattral, Spas Kolev
Faculty of Engineering - Papers (Archive)
The stability of polymer inclusion membranes (PIMs) relative to other liquid membranes is amongst the major reasons for the recent rejuvenation of interest in carrier-mediated transport for selective separation and recovery of metal ions as well as numerous organic solutes. This is reflected by an increasing number of PIM investigations reported in the literature over the last two decades. Given the outstanding performance of PIMs compared to other types of liquid membranes particularly in terms of membrane lifetime, it has been predicted that practical industrial applications of PIMs will be realized in the near future. This review provides a comprehensive …
Simulation Of Travelling Wave Dielectrophoresis Using A Meshless Method, Dafeng Chen, Hejun Du, Weihua Li, Chang Shu
Simulation Of Travelling Wave Dielectrophoresis Using A Meshless Method, Dafeng Chen, Hejun Du, Weihua Li, Chang Shu
Faculty of Engineering - Papers (Archive)
Manipulation and separation of micron-sized particles, particularly biological particles, using the dielectrophoretic effect is an emerging application in BioMEMS technology. This paper presents a numerical simulation for the four-phase traveling dielectrophoresis (DEP) using a novel meshless method - weighted least square finite difference (LSFD) scheme. The exact boundary condition and nonuniform point distribution were used in the calculation. Numerical results including the electrical potential, electrical field, traveling wave DEP forces and particle behavior are presented. Although the LSFD scheme was originally proposed in solving incompressible viscous flow, it is further demonstrated in this paper that the method is also well …
Rapid Adaptive Programming Using Image Data (Rapid), Alexander D. Nicholson, John Norrish, Paul Di Pietro
Rapid Adaptive Programming Using Image Data (Rapid), Alexander D. Nicholson, John Norrish, Paul Di Pietro
Faculty of Engineering - Papers (Archive)
In many welding applications, programming time has been the biggest obstacle for the widespread acceptance of robots, impeding the advancement of this technology and limiting it to medium or large batch applications. In particular, for repair of worn components where the damage is irregular, reprogramming by skilled personnel is required at added cost and time. This paper outlines a novel offline programming technique which allows robot programming to be automated and completed in a few seconds. This technique is applicable to a wide range of industrial wear applications.
Using Asterisms To Decode Multi-User Mimo Systems, Phillip Conder, Tadeusz A. Wysocki
Using Asterisms To Decode Multi-User Mimo Systems, Phillip Conder, Tadeusz A. Wysocki
Faculty of Engineering - Papers (Archive)
The area of Multiple Input Multiple Output (MIMO) communications systems has received enormous attention recently as they can provide a roughly linear increase in data rate by using multiple transmit and receive antennas. MIMO combined with an Turbo coding has been shown as a promising way to achieve near capacity for wireless channels. This paper proposes applying an Asterism based decoder to produce an additional multi user access scheme on top of the primary access method for Ad Hoc networks. After reviewing Sphere and Asterism decoding for MIMO systems with a larger number of transmit than receive antennas, this paper …