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Reliability Of Serviceability And Strength Of Deep Foundations Embedded In (P-Y) Sand Below Water Table Subjected To Lateral Cyclic Loading, Ruoah Yousif
Electronic Theses and Dissertations
Piles are used in many engineering applications especially when we have weak soil that cannot support the proposed structure, also when we have a scour issue with the soil (especially in designing foundations for bridges), or when large uplift capacity is needed. In many engineering applications the piles are subjected to lateral loads as well as axial loads. Many design variables (uncertainties) affect the behavior of laterally loaded piles and the pile-soil system and their modeling. In reality when engineers are faced with uncertainties, they use a factor of safety to design the structure or a component, which is a …
Behavior Of X60 Line Pipe Under Combined Axial And Transverse Loads With Internal Pressure, Navid Nazemi
Behavior Of X60 Line Pipe Under Combined Axial And Transverse Loads With Internal Pressure, Navid Nazemi
Electronic Theses and Dissertations
Buried pipeline may be subjected to various complex combinations of forces and deformations. As a result, localized curvature and strains may occur in the pipe wall and wrinkle may form. The wrinkled pipeline may then develop a rupture and lose its structural integrity if it is subjected to further sustained deformation and/or load. This research program was designed to evaluate the post-wrinkling behaviour and structural integrity of wrinkled pipeline subjected to lateral and axial loads and internal pressure. This research program included both experimental and numerical studies. This study shows that a pipe does not fail in rupture if the …
Load Disturbance Torque Estimation For Motor Drive Systems With Application To Electric Power Steering System, Smitha Cholakkal
Load Disturbance Torque Estimation For Motor Drive Systems With Application To Electric Power Steering System, Smitha Cholakkal
Electronic Theses and Dissertations
Motors are widely used in industries due to its ability to provide high mechanical power in speed and torque applications. Its flexibility to control and quick response are other reasons for its widespread use. Disturbance torque acting on the motor shaft is a major factor which affects the motor performance. Considering the load disturbance torque while designing the control for the motor makes the system more robust to load changes. Most disturbance observers are designed for steady state load conditions. The observer designed here considers a general case making no assumptions about the load torque dynamics. The observer design methods …
Performance Enhancement Of The Ofdm-Based Dsrc System Using Frequency-Domain Map Equalization And Soft-Output Demappers, Nabih Jaber
Electronic Theses and Dissertations
5.9 GHz Dedicated Short-Range Communication (DSRC) systems are based on the orthogonal frequency division multiplexing (OFDM) systems. OFDM systems are well known for their abilities to combat inter-symbol interference (ISI) in time-invariant, frequency-selective channels. We propose a receiver design to enhance the overall performance of the DSRC system to combat ICI instead of ISI caused by the time-varying channel. Most researchers focus on the time-domain channel model and MAP equalization to combat ISI. It is shown that the proposed receiver design outperforms the conventional DSRC system by up to 15 dB for the same bit error rate (BER) level. This …
A Combined Wimax/Dsrc Approach To Vehicular Networking, Nicholas Doyle
A Combined Wimax/Dsrc Approach To Vehicular Networking, Nicholas Doyle
Electronic Theses and Dissertations
From wireless Internet access at cafes to the expanding popularity of smart phones, ubiquitous Internet access has generated much public demand and research. Supplying broadband Internet access for in-vehicle applications is a research area still in its infancy. This thesis examines the strengths and weaknesses of WiMAX and DSRC, two protocols that have been central in much of the research surrounding in-vehicle network access. The thesis then proposes a novel system structure that combines both of these technologies and adds a network access layer in order to provide a system structure that offers high bandwidth, bounded latency and robust support …
Tribological Studies Of Eutectic Al-Si Alloys Used For Automotive Engine Blocks Subjected To Sliding Wear Damage, Guijun Xue
Electronic Theses and Dissertations
The microstructures and wear performances of linerless engine cylinder blocks made of two eutectic Al-Si alloys with different Si morphologies were characterized after the engine tests. Overall, both the Al-11 wt.% Si alloy and the Al-12.6 wt.% Si alloy provided similar wear performance. Block-on-ring wear tests were applied to the Al-11% Si alloy. The MW regime in air consisted of two sub-regimes: MW-1 and MW-2. The argon atmosphere produced a 10-fold reduction in wear rates and the formation of LMW regime at loads less than 10 N. The metallic tribolayers formed in the MW under argon atmosphere were uniform and …
Effect Of Blockage And Densimetric Froude Number On Circular Bridge Pier Local Scour, Benjamin Hodi
Effect Of Blockage And Densimetric Froude Number On Circular Bridge Pier Local Scour, Benjamin Hodi
Electronic Theses and Dissertations
A review of laboratory and field studies for scour around piers reveals the process of water-pier-sediment interaction to be complex. Further, laboratory studies have been conducted under a wide range of conditions using flumes of various widths. Under similar flow conditions, the results are quite varied. The scouring process and empirical design equations are primarily based on laboratory data, while the sidewall interference has mostly been ignored. In the present study, effects of wall interference (blockage) on circular bridge pier local scour were examined under clear water conditions. Experiments were conducted in two flumes of different widths utilizing piers of …
Video Super Resolution, Michael Chukwu
Video Super Resolution, Michael Chukwu
Electronic Theses and Dissertations
Note: appendices for this title available here. Advances in digital signal processing technology have created a wide variety of video rendering devices from mobile phones and portable digital assistants to desktop computers and high definition television. This has resulted in wide diversity of video content with spatial and temporal properties fitting into their intended rendering devices. However the sheer ubiquity of video content creation and distribution mechanisms has effectively blurred the classification line resulting in the need for interchangeable rendering of video content across devices of varying spatio-temporal properties. This results in a need for efficient and effective conversion techniques; …
Joint Multi-Item Storage Location Assignment Capacitated Lot Sizing Problem, Sarina Turner
Joint Multi-Item Storage Location Assignment Capacitated Lot Sizing Problem, Sarina Turner
Electronic Theses and Dissertations
This research develops and solves a mathematical model that combines a dynamic storage location assignment problem with a multi-item capacitated lot sizing problem. The joint multi-item storage location assignment capacitated lot sizing problem aims to model a production warehouse coordinating production with warehouse layout. It examines when to produce an item and how much to produce, then once the item is produced where to place the item in the warehouse. This problem was formulated as a mixed integer program and the objective function was to minimize the costs of production, setup, storage/ retrieval, and handling, and also to implement a …
Effect Of Thermal Treatment On Tensile Properties Of A Vacuum Die Cast Hypoeutectic Al-Si Alloy, Kazi Ahmmed
Effect Of Thermal Treatment On Tensile Properties Of A Vacuum Die Cast Hypoeutectic Al-Si Alloy, Kazi Ahmmed
Electronic Theses and Dissertations
Vacuum assisted high pressure die casting processes appear to gain popularity in automotive industry. A number of thermal treatment schemes have been experimented in an effort to understand the effect of thermal treatment on tensile properties of vacuum die cast modified AA365 alloy. The results of tensile testing indicate that, high temperature treatments have an observable effect on tensile properties. The average ultimate tensile strength of about 286 MPa is achieved at 200˚C thermal treatment for 90 minutes. However, the ductility has reduced to 7.8% from 10.7% in as-cast condition. The morphology of eutectic silicon and magnesium-based phase has sound …
Methane Inverse Diffusion Flames With Co-Flowing Air And Combustion Products, Michael Johnson
Methane Inverse Diffusion Flames With Co-Flowing Air And Combustion Products, Michael Johnson
Electronic Theses and Dissertations
A geometry and reactant delivery method relevant to burners with low emission of nitrogen oxides is studied at the laboratory-scale. The design is an inverse diffusion flame of methane, with a central air jet discharging into a jet of fuel. Surrounding the fuel is an additional co-flow of either air or co-flowing combustion products. The location of the central air discharge is raised above the burner, to allow the fuel to mix with the co-flowing gas before reacting with the central air stream. Characteristics of these flames are studied experimentally with excited-state CH* chemiluminescence imaging. Numerical simulations are validated through …
The Influence Of Horizontal Grout Continuity On The Compressive Stength Of Concrete Block Masonry, Thomas Ring
The Influence Of Horizontal Grout Continuity On The Compressive Stength Of Concrete Block Masonry, Thomas Ring
Electronic Theses and Dissertations
Compression parallel to the bed joint occurs due to flexure in masonry beam elements. Currently, it is believed that there is a reduction in the compressive strength of masonry when it is loaded parallel to the bed joint. It is also believed that this reduction is larger when the webs of the blocks are present in the compression zone, causing an interruption in the grout. This study was undertaken to investigate the effect of loading parallel to the bed joint, as well as web interruption, on the concrete masonry compressive strength. A detailed experimental study using 29 prism and 12 …
A Non-Planar Cmut Array For Automotive Blind Spot Detection, Syed Abbas
A Non-Planar Cmut Array For Automotive Blind Spot Detection, Syed Abbas
Electronic Theses and Dissertations
A discretized hyperbolic paraboloid geometry capacitive micromachined ultrasonic transducer (CMUT) array has been designed and fabricated for automotive blind spot monitoring application. The array is designed for a frequency range of 113-167 kHz, beamwidth of 20▒50 with a maximum sidelobe intensity of -6dB. An SOI based fabrication technology has been used for the 5x5 array with 5 sensing surfaces along each x and yaxis and 7 elevation levels. An assembly and packaging technique has been developed to realize the non-planar geometry in a PGA-68 package. Two new analytical models has been developed to more accurately calculate the deflection profile of …
Linerless Eutectic Al-Si Engine Wear: Microstructural Evolution, Benjamin Slattery
Linerless Eutectic Al-Si Engine Wear: Microstructural Evolution, Benjamin Slattery
Electronic Theses and Dissertations
The wear mechanisms of novel linerless eutectic Al-Si engines subjected to extensive dynamometer testing have been thoroughly investigated using an array of surface and subsurface techniques to elucidate the effects of alloying, surface preparation, and temperature on the overall wear progression of linerless Al-Si engines. The efforts of this research have revealed that the long term wear resistance of linerless eutectic Al-Si engine bores is derived from the combined effects of oil deposits, silicon exposure, and the formation of reduced grain structures in the aluminum-matrix. Under this criterion, silicon particles maintained exposure at an equilibrium height of ~0.4 to 0.6 …
Reliability Consideration In The Design Of Cellular Manufacturing Systems Using Genetic Algorithm, Xiao Wang
Reliability Consideration In The Design Of Cellular Manufacturing Systems Using Genetic Algorithm, Xiao Wang
Electronic Theses and Dissertations
Note: appendices for this title available . This thesis proposes a multi-objective, mixed integer, non-linear programming model of cellular manufacturing systems (CMS) design to maximize the system reliability and minimize the total system cost simultaneously. The model involves multiple machine types, multiple machines for each machine type, multiple part types, and alternative process routes for each part type. Each process route consists of a sequence of operations. System reliability associated with machines along process routes can be improved by increasing the number of parallel machines subject to acceptable cost. Assuming machine reliability to follow a lognormal distribution, the CMS design …
Low Complexity Finite Field Multiplier For A New Class Of Fields, Seyed Shahabi
Low Complexity Finite Field Multiplier For A New Class Of Fields, Seyed Shahabi
Electronic Theses and Dissertations
Finite fields is considered as backbone of many branches in number theory, coding theory, cryptography, combinatorial designs, sequences, error-control codes, and algebraic geometry. Recently, there has been considerable attention over finite field arithmetic operations, specifically on more efficient algorithms in multiplications. Multiplication is extensively utilized in almost all branches of finite fields mentioned above. Utilizing finite field provides an advantage in designing hardware implementation since the ground field operations could be readily converted to VLSI design architecture. Moreover, due to importance and extensive usage of finite field arithmetic in cryptography, there is an obvious need for better and more efficient …
Calibration And Testing Of Simple Mass Balance Model For Quantifying Stormwater Management Benefit Of An Extensive Green Roof, Biman Paudel
Calibration And Testing Of Simple Mass Balance Model For Quantifying Stormwater Management Benefit Of An Extensive Green Roof, Biman Paudel
Electronic Theses and Dissertations
A simple mass balance based model for quantifying stormwater management benefits of an extensive green roof was developed and tested based on data from Lawrence Technological University. Model simulated green roof runoff peaks and volume agreed with those measured between April to September 2008 within a factor of 0.97 to 1.4 and 0.8 to 1.6 respectively. The objective of limiting roof runoff peaks from 2 to 100 year design storms to equal or be lower than the corresponding pre-developmental peaks for the tested regional conditions was not met with the green roof alone. Provision of an additional storage of 40 …
A Study Of Central Florida Nonroad Voc And Nos Emissions And Potential Actions To Reduce Emissions, Michael Radford
A Study Of Central Florida Nonroad Voc And Nos Emissions And Potential Actions To Reduce Emissions, Michael Radford
Electronic Theses and Dissertations
Ground-level ozone is harmful to the human respiratory system, as well as the environment. The national EPA 8-hour ozone standard for ground-level ozone was reduced from 85 parts per billion (ppb) to 75 ppb in 2008, and trends from previous years show that some of the counties in Central Florida could be in danger of violation. Violation means "non attainment" status; in which the county is ordered by EPA to develop specific implementation plans to reduce its emissions. The objective of this study was to compile an emissions inventory of volatile organic compounds (VOCs) and nitrogen oxides (NOx) from nonroad …
Design And Evaluation Of A Parameterizable Noc Router For Fpgas, Michael Brugge
Design And Evaluation Of A Parameterizable Noc Router For Fpgas, Michael Brugge
Electronic Theses and Dissertations
The Network-on-Chip (NoC) approach for designing (System-on-Chip) SoCs is currently emerging as an advanced concept for overcoming the scalability and efficiency problems of traditional on-chip interconnection schemes. This thesis addresses the design and evaluation of a parameterizable NoC router for FPGAs. The importance of low area overhead for NoC components is crucial in FPGAs, which have fixed logic and routing resources. We achieve a low area router design through optimizations in switching fabric and dual purpose buffer/connection signals. We propose a component library to increase re-use and allow tailoring of parameters for application specific NoCs of various sizes. A set …
Experimental Study Of Synthetic Jets, Hoda Eiliat
Experimental Study Of Synthetic Jets, Hoda Eiliat
Electronic Theses and Dissertations
An experimental investigation on the mean velocity distribution of a round synthetic jet generated by an acoustic driver has been performed and analyzed. Velocity profiles at the orifice plane and at parallel planes located at various distances have been obtained for this purpose. The main objective of this thesis is to determine the effect of orifice diameter and jet excitation frequency using dimensionless parameters (Reynolds number and Stroke Length) on the velocity profiles of synthetic jets. Results obtained from the experimental analysis are compared to the existing results and the trends are in good agreement.
Characterization Of Fracture And Debonding Of Silicon Particles In Aluminium Silicon Alloys, Jun Feng Su
Characterization Of Fracture And Debonding Of Silicon Particles In Aluminium Silicon Alloys, Jun Feng Su
Electronic Theses and Dissertations
AlSi alloy engines have been used to reduce fuel consumption and CO2 emission. The wear resistance of AlSi surface is thought to originate from the high hardness of the silicon surface formed by the primary Si particles (inclusions). The mechanical strength of the Al/Si interface and fracture toughness of Si particles in Al matrix are the primary factors determining the strength on the load bearing formation. In this work, a hybrid method to characterize the fracture and interface debonding of Si particles in an AlSi alloy has been developed, which combining a nanoindentation experiment and a finite element analysis. The …
Shallow Wake In Open Channel Flow - A Look Into The Vertical Variability, Arindam Singha
Shallow Wake In Open Channel Flow - A Look Into The Vertical Variability, Arindam Singha
Electronic Theses and Dissertations
The vertical variability of a typical wake behind a bluff body in an open channel flow has been investigated. The focus of the study was to explore the variability of the flow structures in terms of mean velocity profiles, turbulent parameters and coherent structures in the vertical direction. A sharp-edged bluff body was chosen to minimize the effect of Reynolds number and ensure fixed flow separation points in the vertical direction. Velocity measurement was performed by Particle Image Velocimetry at three vertical locations: near-bed, mid-depth and near the free surface. In the streamwise direction, three different fields-of-view are taken to …
Analysis Of Second-Phase Particle Fracture In Hypereutectic Aluminum-Silicon Alloys, Sandeep Bhattacharya
Analysis Of Second-Phase Particle Fracture In Hypereutectic Aluminum-Silicon Alloys, Sandeep Bhattacharya
Electronic Theses and Dissertations
Vickers micro-indentation tests were performed on second-phase particles of Al- 18.5wt.%Si and results were compared with those of monolithic silicon. Damage microstructures beneath indented second-phase silicon particles were studied to determine the crack morphologies causing particle fracture, and also to identify the role of indentation-induced phase transformations on subsurface damage. Plastic deformation at low loads and volume expansion due to subsurface crack formation at high loads (>650 mN) were responsible for pile-up formations around the indentations. The probability of lateral cracks reaching the surface and causing particle fracture was shown to obey Weibull statistics with a low modulus. Diamond …
Biotextured Nanocrystalline Materials With Superhydrophobic Surfaces And Controlled Friction And Wear, Mehdi Shafiei
Biotextured Nanocrystalline Materials With Superhydrophobic Surfaces And Controlled Friction And Wear, Mehdi Shafiei
Electronic Theses and Dissertations
This study aimed to develop new wear-resistant materials with superhydrophobic surfaces and low friction by combining the high strength of nanocrystalline (NC) materials with the biological surface textures. This goal was accomplished in three stages. First, the tribological properties of electrodeposited NC Ni and NC Co were studied, and the role of the oxide-rich tribolayers in reducing the friction and wear rates was delineated. For the NC Ni, micromechanisms of wear in different testing environments were characterized, and the sliding-speed sensitivity of friction and wear rate was investigated. A modified Archard equation was proposed to predict the wear rates of …
Effective Width Of Gusset Plate With Single Or Double Bolts In Tension, Hassan Abbasi
Effective Width Of Gusset Plate With Single Or Double Bolts In Tension, Hassan Abbasi
Electronic Theses and Dissertations
In this study experimental and numerical investigation to determine the behavior of gusset plate connections with one and two bolts under quasi-static monotonically increasing tension load was undertaken. The experiments on full-scale gusset plate connections were undertaken in the Structural Engineering Laboratory of the University of Windsor. The numerical modeling and analysis were undertaken using commercially available finite element code, ABAQUS. The results obtained from experimental and numerical methods agree well. The results of the study were also used to determine the strain distribution in the gusset plates connected with one and two bolts. The yield load of gusset plate …
Behaviour Of Corroded X46 Steel Pipe Under Internal Pressure And Axial Load, Halima Dewanbabee
Behaviour Of Corroded X46 Steel Pipe Under Internal Pressure And Axial Load, Halima Dewanbabee
Electronic Theses and Dissertations
Corrosion is a major cause for buried gas pipeline failure. Current design guidelines are limited to pressure loading for assessing corroded pipeline's integrity. A few studies were conducted by other researchers to determine the remaining bending or pressure strength of the corroded pipelines under combined loading. No study was conducted to determine the axial compressive strength of the corroded pipelines although it could be the major cause of pipeline failure. Therefore, the current study was completed using full-scale tests and a parametric study using FEA to assess the integrity of X46 corroded pipe subjected to severe axial compression and internal …
Fermentation Of Glucose And Xylose To Hydrogen In The Presence Of Long Chain Fatty Acids, Stephen Reaume
Fermentation Of Glucose And Xylose To Hydrogen In The Presence Of Long Chain Fatty Acids, Stephen Reaume
Electronic Theses and Dissertations
Hydrogen is a clean, efficient and versatile energy source which makes it a suitable alternative to fossil fuels. Mixed anaerobic cultures has the potential to produce hydrogen in a sustainable way in methanogenic bacteria can be inhibited. Batch studies were performed to assess the fermentation of glucose and xylose individually and together to observe if the sugar mixture is effective in hydrogen fermentation. Experiments were performed using a variety of LCFAs in order to inhibit methanogens so hydrogen can be collected. The highest amount of hydrogen produced took place in cultures fed LA plus xylose, glucose and the 50%/50% sugar …
Design And Implementation Of A Cross-Platform Sensor Network For Transmission Line Monitoring, Patrick Casey
Design And Implementation Of A Cross-Platform Sensor Network For Transmission Line Monitoring, Patrick Casey
Electronic Theses and Dissertations
The current era calls for a greater electricity demand than ever before. Slow information feedback to other power stations was a major contributor to North America's northeast blackout of 2003. Had fault information been efficiently forwarded, the blackout area would have been reduced. It can be seen that having the knowledge of knowing exactly what is happening on the power distribution grid is extremely valuable. This thesis develops a self configuring, sampling and forwarding scheme for transmission line monitoring. A hierarchical communication topology is also proposed. The developed prototype operates successfully and its functionality is documented. A ZigBee testbed is …
Analysis, Modeling And Improvement Of Patient Discharge Process In A Regional Hospital, Nancy Khurma
Analysis, Modeling And Improvement Of Patient Discharge Process In A Regional Hospital, Nancy Khurma
Electronic Theses and Dissertations
This thesis presents results of a study conducted jointly with a regional hospital and concerned with the inpatient discharge process. A thorough mapping of the existing process flow and analysis of 1700 historical cases were conducted. Results revealed that in its current form the process is inadequately defined, lacks consistency, and its performance is hard to predict. These issues cause inpatient overstays past their prescribed acute care (so called Alternative Level of Care, or ALC days) and thus at least 8% of available hospital bed capacity is wasted. Key factors extending unnecessary patient stays were identified and used as predictors …