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Full-Text Articles in Engineering

Parametric Study On A Novel Waste Heat Recovery System, Ghaleb Rustom Abdul Sater Dec 2012

Parametric Study On A Novel Waste Heat Recovery System, Ghaleb Rustom Abdul Sater

Electronic Thesis and Dissertation Repository

The present thesis is based on an industry-sponsor project involving a novel waste heat-to-electricity conversion system. This proprietary system utilizes thermal energy from a low temperature heat sources to produce torque that drives an electric generator to produce electricity. The system needs to be studied through scientific research to help with optimizing the product development, component design, and overall system performance. The main objectives of this study are to develop simulation tools (numerical model) that will allow to simulate the thermo-fluid processes in various system components and to use this numerical model to study the heat transfer and phase-change processes ...


Optimal Inertial Sensor Placement And Motion Detection For Epileptic Seizure Patient Monitoring, Babak Kamalizonouzi Dec 2012

Optimal Inertial Sensor Placement And Motion Detection For Epileptic Seizure Patient Monitoring, Babak Kamalizonouzi

Electronic Thesis and Dissertation Repository

Use of inertial sensory systems to monitor and detect seizure episodes in patients suffering from epilepsy is investigated via numerical simulations and experiments. Numerical simulations employ a mathematical model that is able to predict human body dynamic responses during a typical epileptic seizure. An optimized inertial sensor placement procedure is developed to address achievement of highest possible sensing resolution in determining angular accelerations with minimal errors. In addition, a joint torque estimation procedure is formulated to assist in the future development of a possible detection scheme. Experimental motion data obtained from an epileptic seizure patient as well as a healthy ...


Development Of A Compact Piezoworm Actuator For Mr Guided Medical Procedures, Khaled El Bannan Dec 2012

Development Of A Compact Piezoworm Actuator For Mr Guided Medical Procedures, Khaled El Bannan

Electronic Thesis and Dissertation Repository

In this research, a novel piezoelectric actuator was developed to operate safely inside the magnetic resonance imaging (MRI) machine. The actuator based on novel design that generates linear and rotary motion simultaneously for higher needle insertion accuracy. One of the research main objectives is to aid in the selection of suitable materials for actuators used in this challenging environment. Usually only nonmagnetic materials are used in this extremely high magnetic environment. These materials are classified as MRI compatible materials and are selected to avoid hazardous conditions and image quality degradation. But unfortunately many inert materials to the magnetic field do ...


Experimental Investigation Of The Fluid Temperature Field And The Thermal Performance Of Insert Devices In A Flat-Plate Solar Collector, Gurveer Singh Sandhu Dec 2012

Experimental Investigation Of The Fluid Temperature Field And The Thermal Performance Of Insert Devices In A Flat-Plate Solar Collector, Gurveer Singh Sandhu

Electronic Thesis and Dissertation Repository

An experimental study on the thermal flow behavior inside a flat-plate collector and the impact of insert devices (passive heat transfer enhancement techniques) on the thermal performance of the collector is presented. Temperature fields were obtained for different Reynolds numbers (250-650) and at different inclination angles of the collector. The results show that a stratified flow is developed inside the collector and the warmer fluid restricts itself to the upper portion of the collector only. Various new configurations of the conventional insert devices were tested over a wide range of Reynolds number (200-8000). Comparison of these devices show that in ...


Studies In Shallow And Thin-Film Flows, Md Mahmuder R. Faisal Oct 2012

Studies In Shallow And Thin-Film Flows, Md Mahmuder R. Faisal

Electronic Thesis and Dissertation Repository

The present study examines the influences of surface tension and wind direction in shallow or thin-film flow with the inclusion of inertial effect. In this present study starting with the fundamental equations (conservation of mass and momentum), an analytical method is introduced to determine the bottom stress at different position of a shallow or thin-film flow domain under the influence of oscillatory wind conditions. The novelty of this study is that the viscous and surface tension effects are considered in this study, whereas in most of the existing studies in a shallow or thin-film flow domain (a shallow tailings pond ...


Characterization Of Solar Roadways Via Computational And Experimental Investigations, Rajesh Kanna Selvaraju Oct 2012

Characterization Of Solar Roadways Via Computational And Experimental Investigations, Rajesh Kanna Selvaraju

Electronic Thesis and Dissertation Repository

Efficiency of traditional solar panels is known to be very low and hence necessitates the use of extensive open spaces for producing solar-based electric power. In solar roadways concept, open spaces such as roads, parking lots, bicycle lanes, footpaths are proposed to be utilized. An in-depth quantitative feasibility study for implementing solar roadways in Canada is carried out considering the total available surfaces, solar panel efficiency and effects of fast moving shades. The load carrying capability of commercially available materials for the solar panel top cover is studied in an effort to examine the current as well as near-future implementation ...


Development Of A Novel Handheld Device For Active Compensation Of Physiological Tremor, Abhijit Saxena Oct 2012

Development Of A Novel Handheld Device For Active Compensation Of Physiological Tremor, Abhijit Saxena

Electronic Thesis and Dissertation Repository

In microsurgery, the human hand imposes certain limitations in accurately positioning the tip of a device such as scalpel. Any errors in the motion of the hand make microsurgical procedures difficult and involuntary motions such as hand tremors can make some procedures significantly difficult to perform. This is particularly true in the case of vitreoretinal microsurgery. The most familiar source of involuntary motion is physiological tremor. Real-time compensation of tremor is, therefore, necessary to assist surgeons to precisely position and manipulate the tool-tip to accurately perform a microsurgery. In this thesis, a novel handheld device (AID) is described for compensation ...


Improved Non-Linear Solution Of Dip Coating Flow, Omar Bin Yusuf Aug 2012

Improved Non-Linear Solution Of Dip Coating Flow, Omar Bin Yusuf

Electronic Thesis and Dissertation Repository

A thin layer of film is developed on the surface of a substrate in the dip coating process where the substrate is initially immersed into the coating fluid and then withdrawn continuously from the coating fluid bath. In this study a two dimensional flow of the thin film for a Newtonian fluid is examined theoretically by dividing the film into three separate regions. A general formulation is developed for a thin film flow, which then simplifies for each region upon considering appropriate assumptions to each region. The influence of inertia and surface tension in the presence of gravity is investigated ...


Preoperative Planning Of Robotics-Assisted Minimally Invasive Cardiac Surgery Under Uncertainty, Hamidreza Azimian Aug 2012

Preoperative Planning Of Robotics-Assisted Minimally Invasive Cardiac Surgery Under Uncertainty, Hamidreza Azimian

Electronic Thesis and Dissertation Repository

In this thesis, a computational framework for patient-specific preoperative planning of Robotics-Assisted Minimally Invasive Cardiac Surgery (RAMICS) is developed. It is expected that preoperative planning of RAMICS will improve the rate of success by considering robot kinematics, patient-specific thoracic anatomy, and procedure-specific intraoperative conditions. Given the significant anatomical features localized in the preoperative computed tomography images of a patient's thorax, port locations and robot orientations (with respect to the patient's body coordinate frame) are determined to optimize characteristics such as dexterity, reachability, tool approach angles and maneuverability. In this thesis, two approaches for preoperative planning of RAMICS are ...


Numerical Simulation Of Catalytic Ozone Decomposition Reaction In A Gas-Solids Circulating Fluidized Bed Riser, Lei Kong Aug 2012

Numerical Simulation Of Catalytic Ozone Decomposition Reaction In A Gas-Solids Circulating Fluidized Bed Riser, Lei Kong

Electronic Thesis and Dissertation Repository

Computational fluid dynamics (CFD) modeling of catalytic ozone decomposition reaction in a circulating fluidized bed (CFB) riser using iron impregnated FCC particles as catalyst is carried out. The catalytic reaction is defined as a one-step reaction with an empirical coefficient. Eularian-Eularian method with kinetic theory of granular flow is used to solve the gas-solids two-phase flow in the CFB riser. The simulation results are compared with experimental data, with the reaction rate modified using an empirical coefficient to provide better simulation results than the original reaction rate. Moreover, the particle size has great effects on the reaction rate. Studies on ...


Biomechanical Modeling For Lung Tumor Motion Prediction During Brachytherapy And Radiotherapy, Zahra Shirzadi Aug 2012

Biomechanical Modeling For Lung Tumor Motion Prediction During Brachytherapy And Radiotherapy, Zahra Shirzadi

Electronic Thesis and Dissertation Repository

A novel technique is proposed to develop a biomechanical model for estimating lung’s tumor position as a function of respiration cycle time. Continuous tumor motion is a major challenge in lung cancer treatment techniques where the tumor needs to be targeted; e.g. in external beam radiotherapy and brachytherapy. If not accounted for, this motion leads to areas of radiation over and/or under dosage for normal tissue and tumors. In this thesis, biomechanical models were developed for lung tumor motion predication in two distinct cases of lung brachytherapy and lung external beam radiotherapy. The lung and other relevant ...


An Automated Lab-On-A-Cd System For Parallel Whole Blood Analyses, Tingjie Li Aug 2012

An Automated Lab-On-A-Cd System For Parallel Whole Blood Analyses, Tingjie Li

Electronic Thesis and Dissertation Repository

Medical diagnostics plays a critical role in human healthcare. Blood analysis is one of the most common clinical diagnostic assays. Biomedical engineers have been developing portable and inexpensive diagnostic tools that enable fast and accurate tests for individuals who have limited resources in places that require such field applications. The emergence of Lab-on-a-CD technology provides a compact centrifugal platform for high throughput blood analysis in point-of-care (POC) diagnostics. The objective of this thesis work is to develop a Lab-on-a-CD system for parallel quantitative detection of blood contents.

Blood separation is a key step in blood analysis. By integrating out-of-plane microvalves ...


Structure-Property Relationships Of Magnesium Alloys, Pouya Sharifi Aug 2012

Structure-Property Relationships Of Magnesium Alloys, Pouya Sharifi

Electronic Thesis and Dissertation Repository

First, I would like to acknowledge Meridian Technologies Inc., for their contributions in the materials, equipment and facilities that made this work possible.

Second, this project was also partly funded By AUTO21 Network of Centers of Excellence, an automotive research and development program focusing on issues relating to the automobile in the 21st century. AUTO21, member of the Networks of Centers of Excellence of Canada program is funded by the Natrual Science and Engineering Research Council (NSERCT), the Social Science and Humanities Research Council (SSHRC) and multiple industries.

Third, I would like to thank the invaluable inputs and guidance ...


Numerical Modelling Of Transport In Complex Porous Media: Metal Foams To The Human Lung, Christopher T. Degroot Jul 2012

Numerical Modelling Of Transport In Complex Porous Media: Metal Foams To The Human Lung, Christopher T. Degroot

Electronic Thesis and Dissertation Repository

Transport in porous media has many practical applications in science and engineering. This work focuses on the development of numerical methods for analyzing porous media flows and uses two major applications, metal foams and the human lung, to demonstrate the capabilities of the methods. Both of these systems involve complex pore geometries and typically involve porous domains of complex shape. Such geometric complexities make the characterization of the relevant effective properties of the porous medium as well as the solution of the governing equations in conjugate fluid-porous domains challenging. In porous domains, there are typically too many individual pores to ...


Consistent Density Scanning And Information Extraction From Point Clouds Of Building Interiors, Kuldeep Kumar Sareen Jun 2012

Consistent Density Scanning And Information Extraction From Point Clouds Of Building Interiors, Kuldeep Kumar Sareen

Electronic Thesis and Dissertation Repository

Over the last decade, 3D range scanning systems have improved considerably enabling the designers to capture large and complex domains such as building interiors. The captured point cloud is processed to extract specific Building Information Models, where the main research challenge is to simultaneously handle huge and cohesive point clouds representing multiple objects, occluded features and vast geometric diversity. These domain characteristics increase the data complexities and thus make it difficult to extract accurate information models from the captured point clouds.

The research work presented in this thesis improves the information extraction pipeline with the development of novel algorithms for ...


Investigation Of In-Vivo Hindfoot And Orthotic Interactions Using Bi-Planar X-Ray Fluoroscopy, Kristen M. Bushey Jun 2012

Investigation Of In-Vivo Hindfoot And Orthotic Interactions Using Bi-Planar X-Ray Fluoroscopy, Kristen M. Bushey

Electronic Thesis and Dissertation Repository

A markerless RSA method was used to determine the effect of orthotics on the normal, pes planus and pes cavus populations. Computed tomography (CT) was used to create bone models that were imported into the virtual environment. Joint coordinate systems were developed to measure kinematic changes in the hindfoot during weight-bearing gait and quiet standing. The objectives of this thesis were to (1) implement a fluoroscopy-based markerless RSA system on the foot, (2) determine the effect of various orthotics at midstance of fully weight-bearing dynamic gait, and (3) determine the effect of orthotics as measured using three different techniques. Every ...


In-Vivo Investigation Of The Medial Longitudinal Arch Of The Foot And Orthotic Interactions Using Bi-Planar Fluoroscopy, Megan E.R. Balsdon May 2012

In-Vivo Investigation Of The Medial Longitudinal Arch Of The Foot And Orthotic Interactions Using Bi-Planar Fluoroscopy, Megan E.R. Balsdon

Electronic Thesis and Dissertation Repository

Orthotic devices are a conservative treatment for common disorders of the foot and ankle such as pes planus and pes cavus. It is thought that orthotics change the kinematics of the foot by applying forces and constraint on the plantar surface, which can act to change body biomechanics and correct for malalignment in the legs and trunk. This thesis compares the angle of the medial longitudinal arch (MLA) between three foot types: pes planus (low arch), pes cavus (high arch) and normal arch, during barefoot and shoed walking, and walking with orthotics. In-vivo bi-planar fluoroscopy was used with markerless radiostereometric ...


Electrohydrodynamic Enhancement Of Heat Transfer And Mass Transport In Gaseous Media, Bulk Dielectric Liquids And Dielectric Thin Liquid Films, Seyed Reza Mahmoudi May 2012

Electrohydrodynamic Enhancement Of Heat Transfer And Mass Transport In Gaseous Media, Bulk Dielectric Liquids And Dielectric Thin Liquid Films, Seyed Reza Mahmoudi

Electronic Thesis and Dissertation Repository

Controlling transport phenomena in liquid and gaseous media through electrostatic forces has brought new important scientific and industrial applications. Although numerous EHD applications have been explored and extensively studied so far, the fast-growing technologies, mainly in the semiconductor industry, introduce new challenges and demands. These challenges require enhancement of heat transfer and mass transport in small scales (sometimes in molecular scales) to remove highly concentrated heat fluxes from reduced size devices. Electric field induced flows, or electrohydrodynamics (EHD), have shown promise in both macro and micro-scale devices.

Several existing problems in EHD heat transfer enhancements were investigated in this thesis ...


Mechanical Instability Of Thin Solid Film Structures, Masoud Noroozi May 2012

Mechanical Instability Of Thin Solid Film Structures, Masoud Noroozi

Electronic Thesis and Dissertation Repository

Instability of thin film structures as buckling and wrinkling are important issues in various fields such as skin aging, mechanics of scars, metrology of the material properties of thin layers, coating of the surfaces and etc. Similar to the buckling, highly ordered patterns of wrinkles may be developed on the film‒substrate due to compressive stresses. They may cause a failure of the system as structural damage or inappropriate operation, however once they are well understood, it is possible to control and even use them properly in various systems such as the gossamer structures in the space, stretchable electronics, eyelike ...


Investigation Of The Use Of Micro-Mechanical Testing To Analyze The Mechanical Anisotropy Of The Zr-2.5%Nb Pressure Tube Alloy, Richard O. Oviasuyi Apr 2012

Investigation Of The Use Of Micro-Mechanical Testing To Analyze The Mechanical Anisotropy Of The Zr-2.5%Nb Pressure Tube Alloy, Richard O. Oviasuyi

Electronic Thesis and Dissertation Repository

Maintaining a safe operation of nuclear power plants is the primary requirement of nuclear power generating organizations worldwide. This necessitates the use of highly effective methods for assessing the mechanical properties of reactor materials and components. This is important since all components located in a nuclear reactor core experience high levels of neutron irradiation which cause defects to be formed in the metals’ crystal structure. The density of these crystal defects increases with increasing exposure to neutrons and cause the crystalline metal to become harder and simultaneously more brittle. This change in mechanical properties is potentially detrimental to the safe ...


Development Of Novel Solar Tracking And Heat Extracting Technologies, Hassan Latif Hassan Apr 2012

Development Of Novel Solar Tracking And Heat Extracting Technologies, Hassan Latif Hassan

Electronic Thesis and Dissertation Repository

The global energy and water crises are looming due to the exponential population growth and the shrinking reserves of conventional fossil fuels and fresh water. The present research is aimed at the development of novel components/technologies that would lead to efficient and affordable concentrated solar thermal systems. A novel dual-axis solar tracking system has been developed, built and extensively tested on a field parabolic dish solar collector model. The tracker has two main novel components; active dual axis tracker; and load compensator. The tracker is characterized with simplicity and reliability. Two geometries of novel conical thermal receivers were designed ...


On-Line Monitoring Of Engine Health Through The Analysis Of Contaminants In Engine Lubricant, Hamid R. Aghayan Apr 2012

On-Line Monitoring Of Engine Health Through The Analysis Of Contaminants In Engine Lubricant, Hamid R. Aghayan

Electronic Thesis and Dissertation Repository

Monitoring automobile liquids, such as engine lubricants, has received increasing attention recently mainly due to environmental and safety legislation, coat saving measures, and customer demand.

Literature review in monitoring engine lubricant condition indicates systems approach, an intellectual discipline method to address complex problem, has never been used to monitor engine performance and health through the engine sub-systems such as lubricant system. The literature review also points toward deficiency in considering lubricant as a source of information for engine performance evaluation, and lack of understanding of engine lubricant as a medium with random properties.

Engine lubricant condition reflects the state of ...


An Experimental Investigation On The Flow Behaviour In A Transpired Air Collector, David Greig Apr 2012

An Experimental Investigation On The Flow Behaviour In A Transpired Air Collector, David Greig

Electronic Thesis and Dissertation Repository

An experimental investigation of the flow dynamics in a transpired air collector channel with a corrugated surface is presented. Particle image velocimetry (PIV) was used to obtain twodimensional velocity fields to compare the effects of surface heating on the flow for five flow rates. Mean velocity and turbulent property profiles are presented and compared. Proper orthogonal decomposition and wavenumber spectrum analyses were also conducted to investigate the underlying interactions between the turbulent structures that comprise the complex flow behaviour observed in corrugated flows. Results show that the corrugated waveform was the primary source of turbulence at all flow rates and ...


Optically Driven Ph Gradient Generator Based On Self-Assembled Proton Pumps For Activating Hydrogel Microactuators, Khaled M. Al-Aribe Apr 2012

Optically Driven Ph Gradient Generator Based On Self-Assembled Proton Pumps For Activating Hydrogel Microactuators, Khaled M. Al-Aribe

Electronic Thesis and Dissertation Repository

This dissertation presents a new approach for developing a biologically inspired photo-electro-chemo-mechanical microactuator by exploiting the ion pumping characteristics of bacteriorhodopsin (bR) proton pumps and the pH sensitivity of smart hydrogels. The ultimate goal of this project is to prove the viability of integrating bR monolayer into novel actuation applications using molecular level architectures. To accomplish this, the bR proton pumps are molecularly labelled, organized, and directionally immobilized on Au-coated substrate, and then integrated with pH sensitive hydrogel. When responding to an incident light beams, the internal proton pumping mechanism is mathematically modeled for quantifying the processing of the photonic ...


Experimental Modal Analysis Of Micron-Scale Structures, Joel M. Book Jan 2012

Experimental Modal Analysis Of Micron-Scale Structures, Joel M. Book

Electronic Thesis and Dissertation Repository

Micron-scale structures, including but not limited to MEMS devices, are a class of mechanical systems with a wide range of real-world applications. One important type of dynamic properties are modal, or vibrational, characteristics, which can have great effects on performance, reliability, and useful life of a system. This makes the determination of these characteristics an important element in the design and testing of these systems. The research described in this thesis addresses important challenges in experimental modal characterization of micron-scale structures, including difficulties in: applying suitable known excitations; measuring small magnitude response motions; avoiding excessive mass loading; and dealing with ...