Open Access. Powered by Scholars. Published by Universities.®

Engineering Science and Materials Commons

Open Access. Powered by Scholars. Published by Universities.®

Masters Theses

Discipline
Institution
Keyword
Publication Year

Articles 31 - 60 of 75

Full-Text Articles in Engineering Science and Materials

A Computational Model To Predict In Vivo Kinetics In Implanted And Non-Implanted Shoulders, Matthew Brennon-Kyle Kubo Aug 2005

A Computational Model To Predict In Vivo Kinetics In Implanted And Non-Implanted Shoulders, Matthew Brennon-Kyle Kubo

Masters Theses

The purpose of this study was to develop and implement a computational model designed to input in vivo kinematic and predict in vivo forces and torques for the shoulder, elbow, and wrist in normal, rotator cuff-deficient (RCD), reverse shoulder arthroplasty (RSA) and total shoulder arthroplasty (TSA) shoulder subjects. Twenty subjects, divided evenly amongst the four shoulder types, performed a box-lift activity while under fluoroscopic surveillance. Three dimensional (3D) in vivo kinematics was determined for the subjects using implant models and bone models created from CT (computed tomography) scans in a 2D-to-3D registration process. The kinematics were used as input for ...


Determination And Comparison Of In Vivo Forces And Torques In Normal And Degenerative Lumbar Spines, Shaun Kevin Stinton Aug 2005

Determination And Comparison Of In Vivo Forces And Torques In Normal And Degenerative Lumbar Spines, Shaun Kevin Stinton

Masters Theses

In vivo motions of normal and degenerative lumbar spine patients performing extension/flexion were obtained using video fluoroscopy. 3-D models of each patient’s vertebrae were registered to the 2-D fluoroscopy images using a process developed at Rocky Mountain Musculoskeletal Research Laboratory. Temporal equations representing the motions were input into a math model and the forces at the contact point between vertebral levels and the body torques between the vertebrae were the output. The vertical forces in the normal and degenerative patients were similar and ranged from 0.35-0.42 times the body weight of the patient. The maximum torques ...


Real-Time Monitoring And Quantification Of Drug Induced Changes In Endothelial Cytoskeleton Filaments Using A Cellular Impedance Biosensor, Vijay Nandakumar Aug 2005

Real-Time Monitoring And Quantification Of Drug Induced Changes In Endothelial Cytoskeleton Filaments Using A Cellular Impedance Biosensor, Vijay Nandakumar

Masters Theses

The analysis of electrical signals originating from biological cells and tissues have yielded a large amount of useful information over the past years. Technologies have been developed, wherein we can monitor the health of the biological material of interest using these electrical signals. Instruments for the study of living cells have historically been of significant importance for such things as basic neuroscience, cell biology, pharmaceutical screening, environmental monitoring, and toxin detection. One of the practical realizations of these methods was successfully implemented by Giaver and Keese with their Electric Cell-Substrate Impedance Sensing (ECIS) system. The purpose of this Masters Thesis ...


Synthesis And Analysis Of Anionic Hydrogel Scaffolds For Endothelial Cell Tissue Engineering, Abitha Sundararajan May 2005

Synthesis And Analysis Of Anionic Hydrogel Scaffolds For Endothelial Cell Tissue Engineering, Abitha Sundararajan

Masters Theses

Acidic hydrogels are cross-linked polymer networks that contain neutral and negatively charged monomers. The degree of negative charge on these soft materials plays a critical role in their biomedical applications. In particular, their use as a scaffold for cardiovascular applications depends on their charged and swollen states. The amount of negative charge, however, is a complicated function of the fabrication conditions, monomeric dissociation constants, ionic strengths and pH of the surround bath solution. This study, therefore, considered four representative acidic hydrogels and their physical properties and interactions with endothelial cells. The acidic monomers methacrylic acid (MAAc) and sulfoethylmethacrylate (SEMA) were ...


A Method To Calculate The Femoro-Polyethylene Contact Pressures In Total Knee Arthroplasty In-Vivo, Adrija Sharma May 2005

A Method To Calculate The Femoro-Polyethylene Contact Pressures In Total Knee Arthroplasty In-Vivo, Adrija Sharma

Masters Theses

This study deals with the development of a computational method that generates the in-vivo contact pressures on the superior side of the polyethylene in total knee arthroplasty (TKA) based on in-vivo kinematic data. Ten clinically successful subjects (five fixed and five mobile bearing TKA), having Hospital for Special Surgery (HSS) knee scores greater than 90, were analyzed under fluoroscopic surveillance while performing a weight-bearing deep knee bend. 3D in-vivo contact positions and kinematics, determined using a 2D to 3D registration technique, and soft tissue locations derived from literature were entered into a 3D inverse dynamics mathematical model to determine the ...


A Validation Simulation Of A Large Pool Fire, W. Reid Williams May 2005

A Validation Simulation Of A Large Pool Fire, W. Reid Williams

Masters Theses

The capabilities of the Fire Dynamics Simulator (Version 3) (FDS3) have been examined to determine whether a large pool fire test can be reasonably simulated. Activities undertaken include 2-D and 3-D pool fire modeling in the absence of wind and heat sinks within the fire principally to compare flame height predictions to established correlations, wind field modeling specifically targeted at developing initial velocity and boundary conditions to use in the simulation of an actual pool fire, and simulation of a specific pool fire test conducted by Sandia National Laboratories in 1983. Processes were developed for determining flame heights based on ...


Assessments Of Vibratory Handheld Tools And Handle Interactions, Douglas Alan Logsdon May 2005

Assessments Of Vibratory Handheld Tools And Handle Interactions, Douglas Alan Logsdon

Masters Theses

There has been a broad history of injuries occurring as the result of vibratory hand-tool use. Following these findings, three human safety standards have been proposed. These standards declare that the dynamic properties with respect to acceleration frequency spectra must be determined for vibratory hand tools. These properties must meet specific tolerances in order to be considered acceptable for use.

The standards, however, do not recognize the significance of the coupling characteristics and the energy transfer between the user and vibrating handle. This interaction reveals the amount of vibratory energy that enters the user's hands. Epidemiological data for VWF ...


Polyampholyte Hydrogel Characteristics And Detecting The Bacterial Interactions With These Hydrogels Using Digital Image Processing Methods, Ram Pratap Gangadharan May 2005

Polyampholyte Hydrogel Characteristics And Detecting The Bacterial Interactions With These Hydrogels Using Digital Image Processing Methods, Ram Pratap Gangadharan

Masters Theses

In recent years, the unique physical properties of synthetic hydrogels have been exploited in a number of interesting and novel applications. In particular polyampholytes have been the subject of many theoretical studies since they provide a model for studying the longrange interactions found in proteins and other forms of soft condensed matter. In balanced polyampholytes the net electrostatic forces are attractive so that in low ionic salt concentration, the chains have a tendency to collapse into compact globules. Addition of salt, which screens these interactions, induces a swelling of the chain. However the electrostatic interactions between polymeric and mobile charges ...


Dynamic Response Analysis Of The Human Knee Joint, Brandi L. Bohleber May 2005

Dynamic Response Analysis Of The Human Knee Joint, Brandi L. Bohleber

Masters Theses

Objective. To perform frequency response analysis of passive intact and rneniscectomized human knee joints under body mass. The knee dynamic system parameters and their alterations with different preloads and displacement amplitudes will be determined.

Design. Using an Instron Mechanical Testing System, specially designed fixtures, and the following softwares: WaveMaker, Excel, LabView, and Matlab, the knees were dynamically tested and analyzed.

Background. Studies have been performed to analyze the dynamic behavior of the human knee. However, no experimental study has investigated the dynamic response of the knee joint under an axial compressive dynamic loading condition considering the effect of the upper ...


Multiple View 3d Reconstruction Of Micro- To Nano-Scopic Specimens, Matthew Alan Schultz Dec 2004

Multiple View 3d Reconstruction Of Micro- To Nano-Scopic Specimens, Matthew Alan Schultz

Masters Theses

Range images and 3D modeling are often utilized on large scale specimens, but have been somewhat overlooked on the microscopic scale. This thesis concentrates on overcoming some of the difficulties of capturing images and creating both 3D models and 2D range images on this scale. During the scope of this thesis we take a deeper look into the optical mechanics of the laser scanning confocal microscope (LSCM) and scanning electron microscope (SEM) to understand the formation of the images and use that information to create our algorithms. With the use of the LSCM we can obtain a stack of 2D ...


Microstrain Pattern Analysis Of The Canine Patellar Tendon Following A Tibial Plateau Leveling Osteotomy, Joshua Paul Stapleton Dec 2004

Microstrain Pattern Analysis Of The Canine Patellar Tendon Following A Tibial Plateau Leveling Osteotomy, Joshua Paul Stapleton

Masters Theses

This study investigates the change in strain patterns of the canine patellar tendon following a Tibial Plateau Leveling Osteotomy (TPLO). The TPLO is a procedure used to minimize anterior tibial translation in canines following a cranial cruciate rupture. A noted clinical deficiency randomly seen with the TPLO is an inflammation of the patellar tendon. In some instances, the inflammation results in material damage resulting in a calcification of the tendon and in worst cases, a fracture of the patella.

In order to investigate the strain patterns, four fresh frozen canine cadaver stifles were used. The cadavers were mounted for stabilization ...


Finite Element Nonlinear Dynamic Response Analysis Of The Human Knee Joint, T. Wayne Pfeiler May 2004

Finite Element Nonlinear Dynamic Response Analysis Of The Human Knee Joint, T. Wayne Pfeiler

Masters Theses

Objective. To develop a detailed non-linear 3-D dynamic finite element model of the knee joint and perform preliminary analysis simulating different loading conditions to confirm reasonable function of the model.

Design. Using ANSYS, a finite element model of the human knee was created and tested.

Background. Finite element models of the knee have been developed in previous studies. However, no study has generated a detailed tissue level model, or performed dynamic testing on a model.

Methods. Initial cartilage and ligament geometry was received from a previous study. A finite element mesh including bone was created. The model was constrained to ...


Development Of A Methodology To Evaluate Environmental Implications Of Lean Implementation, Pamuk Teparakul May 2004

Development Of A Methodology To Evaluate Environmental Implications Of Lean Implementation, Pamuk Teparakul

Masters Theses

While much research has confirmed the effectiveness of lean manufacturing in improving manufacturing productivity, far less work has focused on the impact of lean implementation on the different measures of environmental performance. More notably, there remains much to be understood about the complex relationship between lean manufacturing principles and their overall environmental impacts.

The purpose of this research is to develop a multi-phase methodology to assist practitioners in evaluating overall environmental impacts associated with implementation of various lean manufacturing principles. This knowledge would then allow practitioners to design and analyze manufacturing systems for both productivity and environmental concerns. A case ...


Modeling Of Circulation Zone And Shear Layers In Coaxial Injectors, Clayton Andrew White Dec 2003

Modeling Of Circulation Zone And Shear Layers In Coaxial Injectors, Clayton Andrew White

Masters Theses

Gaseous/gaseous hydrogen oxygen shear coaxial injectors were modeled to investigate grid parameters affecting solution and to determine if a steady state solution might exist if only one circulation zone was present. The General Equation Mesh Solver (GEMS), which implements the Reynolds Averaged Navier-Stokes equations with the k-ω turbulence model, was used to conduct the study. The Gambit grid generator was used to construct computational grids. Different grids were compared in a search for the optimum configuration while residual levels were monitored in search of a steady state solution.


Effect Of Loading Frequency On Intervertebral Disc Cells., Kristen Nicole Loveless Dec 2003

Effect Of Loading Frequency On Intervertebral Disc Cells., Kristen Nicole Loveless

Masters Theses

Cells of the intervertebral disc have a limited capacity for matrix repair and may contribute to the onset and progression of degenerative disc changes. Disc degeneration contributes to declining nutrition, loss of viable cells, cell senescence, post-translational modification of matrix proteins, accumulation of degraded matrix molecules, and fatigue failure of the matrix. During daily activities intervertebral discs are exposed to oscillatory hydrostatic loads. It is known that dynamic loads with critical frequencies close to that of the human spine resonant frequency (4-8 Hz) have a destructive effect on disc tissue properties. Whether this destructive effect is purely mechanical due to ...


The Development And Verification Of Three Matlab Analysis Applications Programmed Specifically For Engage Team Projects., Jonathan W. Huber Aug 2003

The Development And Verification Of Three Matlab Analysis Applications Programmed Specifically For Engage Team Projects., Jonathan W. Huber

Masters Theses

This thesis outlines the development of three analysis applications for use in the freshmen Engineering Fundamentals Program (engage) at the University of Tennessee. Engage teaches freshmen engineering mechanics concepts through a set of integrated components including Lecture, Analysis and Skills, Problem Session, Physical Homework, and Team Projects. Presently, the students have limited access to any software analysis tools to aid the design process. The students have little experience writing the types of complex programs needed to analyze a particular project. Even more, they do not have the time. The applications provide a means for the students to perform an accurate ...


A Study On The Prediction Of Viscosity With The Use Of Numerical Simulation Software, Brian Robinson Aug 2003

A Study On The Prediction Of Viscosity With The Use Of Numerical Simulation Software, Brian Robinson

Masters Theses

A study was undertaken to numerically simulate the flow of highly viscous fluid. Simulating a highly viscous flow within a parallel plate plastometer will hopefully begin to bridge the gaps in the current knowledge of these viscous models. The modeling of this flow was performed using the canned code FiDAP from Fluent Inc. The results are compared with the analytical results calculated by NASA Marshall researchers.


A Study Of The Electron Beam Scattering Under Various Gaseous Environment, Jing He May 2003

A Study Of The Electron Beam Scattering Under Various Gaseous Environment, Jing He

Masters Theses

There are three objectives in this work: to experimentally measure the profiles of electron beams scattered by interaction with a gas, to measure total scattering cross-sections for gases and to apply the cross-section data in a suitable Monte Carlo simulation to predict beam scattering profiles for comparison with experiment.
The experimentally measured profiles cover a wide range of intensity variation. There are two evidenced regions: an inner region and an outer skirt corresponding to inelastic (small angle) and elastic scattering respectively are appeared. These profiles use the planar p-n junction gives us an overall look at the electron beam spreading ...


An Investigation Of Mechanical Properties Of Composites Containing Recycled Rubber Particles, Ryan C. Archey Jan 1997

An Investigation Of Mechanical Properties Of Composites Containing Recycled Rubber Particles, Ryan C. Archey

Masters Theses

In order to promote applications of recycled automobile tires, composite materials of recycled rubber tire particles with ethylene co-vinyl acetate (EVA), polybutadiene (PB), and Primacor were studied in the thesis. The composites were processed using a single screw extruder and a pelletizer. Compression molding was used to form specimens for hardness and impact tests. Mechanical properties of the composites were investigated in terms of tensile strength, percent elongation, Durometer hardness, and impact energy.

In this study, the content of recycled rubber was between 0 and 40 percent. Various matrices were processed using a combination of EVA, PB, or Primacor to ...


Nonlinear Finite Element Micromechanic Analysis Of Thermoplastic Composite Of Recycled High Density Polyethylene Reinforced With Short Glass Fibers, Qiming Lou Jan 1995

Nonlinear Finite Element Micromechanic Analysis Of Thermoplastic Composite Of Recycled High Density Polyethylene Reinforced With Short Glass Fibers, Qiming Lou

Masters Theses

This thesis studied the nonlinear micromechanic behavior of thermoplastic composite of recycled high density polyethylene (HDPE) reinforced with short glass fibers using finite element method. The composite material was modeled using a micromechanic unit cell to simulate the stress distribution between the plastic matrix and the fiber in the composite. Nonlinear behavior of recycled HDPE and imperfect bonding between the fiber and matrix were investigated. Load-bearing capability of the fiber was evaluated using stress partition ratio (SPR) in the composite models. The effect of fiber aspect ratio on the stress distribution of the composite was studied to optimize the material ...


Analysis Of A Ground-Coupled Heat Pump During A Heating Season, Francis Conlin Aug 1984

Analysis Of A Ground-Coupled Heat Pump During A Heating Season, Francis Conlin

Masters Theses

A ground-coupled heat pump, installed in an 170 square meter residential building in Knox County Tennessee, has been examined both experimentally and analytically. The ground coupling was realized with a 210 meter coil buried 1.2 meters beneath the soil, through which circulated a secondary heat transfer fluid. The house, the ground and the power consuming devices were instrumented, and hourly readings of temperatures, heat flows, power consumption, and weather data were recorded.

The experiment was carried out during the 1982-1983 heating season beginning in November and lasting 26 weeks. The overall heating seasonal performance factor was 2.57. No ...


A Transient, One-Dimensional, Discrete-Element Transport Model For Predicting Hydrodynamic Conditions And Three-Layer Non-Equilibrium Pollutant Concentrations As Dissolved In Water And As Adsorbed On Different Classes Of Sediment In Controlled Rivers And Tidal Estuaries, Gary W. Zimmerman Dec 1980

A Transient, One-Dimensional, Discrete-Element Transport Model For Predicting Hydrodynamic Conditions And Three-Layer Non-Equilibrium Pollutant Concentrations As Dissolved In Water And As Adsorbed On Different Classes Of Sediment In Controlled Rivers And Tidal Estuaries, Gary W. Zimmerman

Masters Theses

A transient one-dimensional mathematical model for simulating the transport of pollutant effluents from industrial plants is presented.

The Eulerion fluid-in-discrete-element (FLIDE) formulation employs the integral forms of the conservation principles of water mass, sediment mass, and pollutant mass in variable size discrete elements that span the flow region. The transport of the pollutant effluents are modeled as dissolved and adsorbed suspended sediment in the suspended sediment and slurry sediment layer and as dissolved and stationary resident sediment in the resident sediment layer.

The contributions of vertical variations of the velocity components and pollutant concentrations in the suspended sediment and slurry ...


The Analysis Of An Axially Symmetric Submerged Membrane Shell, Walter Earl Wehmeyer Jan 1972

The Analysis Of An Axially Symmetric Submerged Membrane Shell, Walter Earl Wehmeyer

Masters Theses

"The general theory of large elastic deformations is applied to the problem of a liquid-filled, axisymmetric membrane which is supported on a rigid horizontal plane and subjected to a variable external pressure. The variable external pressure is caused by submerging the membrane to various depths. The variation of the hydrostatic pressure in the inflating medium as well as in the surrounding environment is considered. By assuming large meridional deformations the stress field and the deformed shapes of a submerged membrane made of a neo-Hookean material are obtained. The effect of the initial shape on the deformed configuration of the membrane ...


A Study Of The Effect Of Drilled Holes On The Concentration Of Elastic Stresses Around A Notch, Glenn Michael Kmecz Jan 1972

A Study Of The Effect Of Drilled Holes On The Concentration Of Elastic Stresses Around A Notch, Glenn Michael Kmecz

Masters Theses

"Hole drilling as a method for improving the toughness of notch weakened tensile specimens is investigated by means of a photoelastic technique. Tests were performed on 20%, 40%, 60%, and 80% notch depth specimens machined from PSM-1 photoelastic material. The basic criteria for success was no increase in the elastic stress concentration factor. The photoelastic results were verified by a finite element stress analysis of the 60% notch depth specimens. Comparison of the experimental and numerical results provide conclusive proof that no increase in the elastic stress concentration factor occurs when proper positioning of the drilled holes is accomplished"--Abstract ...


A Comparison Of Analytical And Experimental Approaches In Determining The Thermoelastic Stresses Around A Cylindrical Inclusion Of Elliptical Cross-Section, Kenneth Byron Oster Jan 1972

A Comparison Of Analytical And Experimental Approaches In Determining The Thermoelastic Stresses Around A Cylindrical Inclusion Of Elliptical Cross-Section, Kenneth Byron Oster

Masters Theses

"Three approaches are used to determine the principal stress differences in an infinite elastic medium containing a cylindrical inclusion of elliptic cross-section due to a uniform temperature change. First, the two-dimensional equations of thermoelasticity are solved resulting in equations for the stress components anywhere in the medium material. Second, boundary displacements based on stress-strain relations are used as input displacements in a finite element program of the medium. Third, these same boundary displacements are used as input displacements on a photoelastic model simulating the medium. The problem is treated as one of plane strain in the first approach and one ...


Normal Mode Method Applied To The Transient Longitudinal Vibrations Of A Finite Rod With Material Damping And Viscoelastic Dispersion, David Arthur Levene Jan 1971

Normal Mode Method Applied To The Transient Longitudinal Vibrations Of A Finite Rod With Material Damping And Viscoelastic Dispersion, David Arthur Levene

Masters Theses

"Longitudinal vibrations of a finite rod with material damping and frequency dependent material properties are examined. The normal mode method is used to investigate the transient response of a rod which is free to move in the longitudinal direction and is subjected to a transient longitudinal loading condition at one end. The equations of motion are derived and solved using both the differential equations approach and the energy methods approach of the normal mode method. The effects of material damping and frequency dependent material properties are considered by formulating the stress-strain relation for the material such that the modulus of ...


An Energy Solution For Vibration Characteristics Of Free Thin Cylinders, Dale Elmer Leanhardt Jan 1971

An Energy Solution For Vibration Characteristics Of Free Thin Cylinders, Dale Elmer Leanhardt

Masters Theses

"In this report the flexural vibrations of the walls of free, thin, circular cylinders are considered. Theoretical expressions are developed for the natural frequencies by extending the approximate energy method of Arnold and Warburton to the free-free case. Furthermore, the developed expressions are shown to apply, as special cases, to the fixed-fixed and simply-supported cylinders analyzed by Arnold and Warburton. The energy solution for free-free cylinders is checked both experimentally using a 3500 pound-force, 5 to 2000 hertz, vibration exciter and numerically using the well documented SABOR IV-DYNAL finite element program. While the derived energy method accounts for any prescribed ...


An Investigation Of Stress In The Monowall Construction System Subjected To Racking Loads, Louis Alex Kuhlmann Jan 1971

An Investigation Of Stress In The Monowall Construction System Subjected To Racking Loads, Louis Alex Kuhlmann

Masters Theses

"Several methods of analysis were employed to investigate the stress conditions of concrete block built in the MONOWALL Construction System, when subjected to racking loads. MONOWALL is a technique of assembling blocks with adhesive rather than conventional portland cement mortar. The analyses used in this study included strain gages on full-scale walls, photoelastic models, and a mathematical solution. Each method of analysis is reported separately in detail and the results compared to each other"--Abstract, page ii.


Hydrostatic Extrusion Of Tubular Products, John Lester Roth Jan 1971

Hydrostatic Extrusion Of Tubular Products, John Lester Roth

Masters Theses

"The production of quality tubular products by hydrostatic extrusion has been demonstrated to be a highly satisfactory method. The forming of tubes by the floating mandrel method has been accomplished on mild steel, aluminum alloy, and brass. This thesis describes the method, equipment design and operation, and the results obtained in the hydrostatic tube extrusion. A discussion on the advantages of the use of hydrostatic over conventional extrusion is included. The hydrostatic extrusion system designed for this study is described in detail"--Abstract, page ii.


Free Vibrations Of Circular Cylindrical Shells, Sushil Kumar Sharma Jan 1971

Free Vibrations Of Circular Cylindrical Shells, Sushil Kumar Sharma

Masters Theses

"In this report bending theory of shells is used to determine the natural frequencies and mode shapes of circular cylindrical shells. The governing eighth-order system of differential equations has been put in a form which is especially suitable for numerical integration and application of different sets of homogeneous boundary conditions. The Holzer method is used to solve the eigenvalue problem. During numerical integration of the differential equations, the exponentially growing solutions are suppressed whenever they become larger than previously selected values. Numerical results are obtained for various shell geometry parameters and for three different sets of homogeneous boundary conditions. These ...