Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 164 for “"Thermal Effects"”.
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Thermal effects upon human vibratory sensitivity
Vibrotactile sensitivity is measured using a "dry" procedure as opposed to a "wet" procedure previously used. Thresholds are determined using 40 Hz and 160 Hz stimuli across seven temperatures ranging from 20°C to 44°C. Twelve male subjects participated in each of four sessions, producing a high …
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Force and thermal effects on rotating ablating bodies
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Nonlinear analysis of bonded joints with thermal effects
… of bonded joints is presented. Mechanical and thermal loadings are considered. Material stress-strain response is represented by Ramberg-Osgood approximations. Temperature-dependent properties including modulus percent retentions and coefficients of expansion are modeled with linearly segmented …
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Simulation of Thermal Effects in Semiconductor Materials and Devices
This dissertation deals with the thermal properties of semiconductors, the interaction between thermal and electrical transport, and the numerical methods for their simulation. The approach is based on the Boltzmann transport equation which is used to describe the behavior of both electrons and …
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Turbulent Methane Oxygen CFD Thermal Effects on Rotating Detonation Engine
Thermal effects from Methane-Oxygen stoichiometric simulated heat of combustion in a turbulent annular rotating detonation engine (RDE) have been found to be manageable without the need of thermal management supporting subsystems under 1 second short pulse runs. Computer fluid dynamic simulations, …
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Evaluation of Thermal Effects and Lattice Vibrations in Molecular Crystals
… While it is certainly the case that many effects of temperature can be observed macroscopically, they are often of molecular origin, and determining why these effects occur can provide insight into the nature of chemical systems as a whole. A large portion of this work is dedicated to …
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Thermal Effects on Spin Currents in Non-Local Metallic Spin Valves
… favorable scalability. Recent studies have shown thermal effects created by high current densities play a significant role in the response of NLSVs. These thermal effects also provide the opportunity to create a pure spin current from thermal gradients via a mechanism call the spin dependent …
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Thermal effects of heat losses from an insulated oil-shale sample
Includes bibliographical references.
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Experimental methodology for non-thermal effects of electromagnetic radiation on biologics
… equipment is needed for research on the effects of radio-frequency radiation from radio-frequency identification (RF-ID) systems on biological materials. In the present study, a complete test system comprising assembled hardware and custom-built software was developed for a research …
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Vibration- and Impedance-based Structural Health Monitoring Applications and Thermal Effects
… have been attempted to alleviate temperature effects on SHM algorithms, fundamental research on the effects of temperature on SHM has not been investigated. The work presented in this dissertation composes of two main parts: the first part focuses on the experimental studies of different …
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Temporal and Thermal Effects on Fluvial Erosion of Cohesive Streambank Soils
… cohesive soils, and to quantify and model the effects soil and water temperature on the fluvial erosion of cohesive soils First, erosion tests were performed to investigate how soil erosion resistance develops over time using three natural soils and testing in a laboratory water channel. …
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On the theory of the optical stretcher : optics, mechanics, and thermal effects
… law of elasticity. To take the particle's thermal expansion into account, a particular solution for the presence of a temperature gradient is derived. The temperature profile in the OS was determined experimentally using fluorescence ratio thermometry. Homogeneous agarose micro-spheres were …
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A Numerical Model for Thermal Effects in a Microwave Irradiated Catalyst Bed
… bed heated by a microwave field to predict thermal effects associated with selective heating of the catalyst sites. The model shows a dependence on particle size and microwave frequency on the selective heating of the catalyst sites. The macroscopic thermal effects are shown to be small for …
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Pressure transients in a ruptured gas pipeline with friction and thermal effects included
A theoretical model has been developed which can simulate a linebreak occurring in a gas pipeline. By assuming one-dimensional homogeneous gas flow and neglecting minor losses and changes in cross-sectional area of the pipe, three simultaneous non-linear partial differential equations were derived …
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Investigation of thermal effects on fatigue crack closure using multiscale digital image correlation experiments
… investigates, at multiple length scales, the thermal effects on fatigue crack closure of Hastelloy X, a nickel-based superalloy. Using multiscale, digital image correlation (DIC), macroscale experiments were performed at 2x magnification (2 µm/pix), providing full-field crack closure …
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An Analytical Investigation of Natural Frequency for a Symmetric Composite Box-Beam with Thermal Effects
<p>The main purpose of the following analysis is to develop an analytical method for determining the natural frequency of a symmetric composite box-beam subjected to temperature gradient. A set of coupled partial differential equations of motion is obtained by means of small defection theory and …
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Micropolar Continuum Modeling of Large Space Structures with Flexible Joints and Thermal Effects: Theory and Experiment
… of the strain variables while retaining the effects of the micro-rotations that are coupled to the primary strain terms. As a result, a micropolar-based continuum model is found for the structure with torsional joints. The vibrations equations of motion for various coordinates of the one …
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Study of the thermal effects induced by magnetic resonance on endocardial leads: numerical models and experimental validation
… the study is to systematically investigate the effects of the MRI RF filed on implantable devices and to identify the elements that play a major role in the induced heating. Furthermore, we aimed at developing a realistic numerical model able to simulate the interactions between an RF coil for …
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Impact of Thermal Effects and Other Material Properties on the Performance and Electro-Thermal Reliability of Resistive Random Access Memory Arrays
… surrounding ReRAMs—specifically, their electro-thermal reliability. This research provides evidence highlighting the critical influence of material properties, deposition effects, and thermal transport on the device's performance and reliability. Various material systems have undergone in this …
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