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 28 for “"Propagation Analysis"”.
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Electromechanical Wave Propagation Analysis
… measurement instruments. The speed of EMW propagation is hundreds of miles per second, much less than the electromagnetic wave propagation speed, which is the speed of light. Recently, with the development of renewable energy resources and a growth in using HVDC and FACTS devices, these …
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Belief propagation analysis in two-player games for peer-influence social networks
… threshold model is developed to analyze the propagation of beliefs in the social network, whereby each agent has a belief and a threshold value, which indicts the willingness to be influenced by the peers. Agents communicate in stochastic pairwise interactions with their neighbors. A dynamic, …
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Influence of Induced natural convection on laser propagation : analysis and interferometric visualization
… of a self-induced natural convection flow on the propagation of a high energy laser beam. The two configurations considered are of a vertical laser beam (propagation direction opposite to gravity) and a horizontal laser beam (gravity acting in a direction perpendicular to propagation) traveling …
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Radio propagation analysis for improved UAV data muling of surfaced underwater sensor nodes
… respect to distance and height using a two-ray propagation model in conjunction with the individual radiation patterns of transmitting and receiving antennas. Signal quality over space is then be used to select best waypoints. Packet reception rate is related to the received signal strength …
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Simulation-based fault propagation analysis of process industry using process variable interaction analysis
… an effective, robust, and high accuracy fault propagation analysis and monitoring techniques to prevent undesired events at early stages prior to their occurrence. Among these requirements is the development of an intelligent and automated control and monitoring system to first diagnose faulty …
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Fluoride-salt-cooled high-temperature test reactor thermal-hydraulic licensing and uncertainty propagation analysis
… developed methodology to incorporate uncertainty propagation in a thermal-hydraulic safety analysis for test reactor licensing. A hot channel model, Monte Carlo statistical sampling uncertainty propagation, and limiting safety systems settings (LSSS) approach are uniquely combined to ensure …
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The mid-latitude ionosphere under quiet geomagnetic conditions: propagation analysis of SuperDARN radar observations from large ionospheric perturbations
… First, we seek to establish a better model of HF propagation effects on SuperDARN observations. To do so, we developed a ray-tracing model coupled with the International Reference Ionosphere (IRI). This model is tested against another well established ray-tracing model, then optimized to be …
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Application of GIS in propagation prediction
… of a geographical information system (GIS) in propagation prediction. The motivating force behind this work is the need for accurate and efficient site-specific propagation prediction tools for personal communication system (PCS) design. Site-specific information including terrain and building …
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Nondestructive evaluation of composite rods using ultrasonic wave propagation
… or depreciation. This study presents a detailed analysis of advanced composite rods (comprised of two or more distinct axial sections of different materials) using theoretical ultrasonic NDE. In anticipation of the high elastic moduli of the rods (relative to many metals) along their longitudinal …
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Formal failure analyses for effective fault management: an aerospace perspective
… to reliably manage them. Timed failure propagation analysis studies how and how fast faults propagate through physical and logical parts of a system. We develop formal techniques to validate and automatically generate representations of such behavior from a more detailed model of the …
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Experimental investigation of the flow field during combustion in narrow circular ducts
… quartz tubes yielded cycles of ignition, flame propagation, and extinction. This phenomenon was studied with the intent of determining the flow structure that underlay the observed oscillatory motion. The fluid motion during the oscillations was visualized by seeding TiO2 micron-sized particles. …
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Review of random media homogenization using effective medium theories
Calculation of propagation constants in particulate matter is an important aspect of wave propagation analysis in engineering disciplines such as satellite comnnication, geophysical exploration, radio astronomy and material science. It is important to understand why different propagation constants …
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A Comprehensive Method and System for the Design and Deployment of Wireless Data Networks
… system modeling, and advanced ray tracing propagation analysis to directly predict throughput, frame error rate (FER), and other critical performance parameters for emerging wireless data networks.
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Development of Color Ratio Thin Filament Pyrometry Approach for Applications in High Speed Flames
… thermocouple on the same burner setup. An error propagation analysis was performed to determine which factors contribute the most to the final measurement uncertainty and confidence intervals are calculated for the results. Uncertainty values for a single point measurement were determined to be …
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Brain Signal Quantification and Functional Unit Analysis in Fluorescent Imaging Data by Unsupervised Learning
… struggle, either due to their limited signal analysis capabilities or poor performance. Here we present Activity Quantification and Analysis (AQuA2), an innovative analysis platform built upon machine learning theory. AQuA2 features a novel event detection pipeline for precise quantification …
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Engineering change modelling using a function-behaviour-structure scheme
… components causing further changes. This change propagation significantly affects the success of a product in the market by increasing development cost and time-to-market. As such engineering change management is essential to companies, but it is a complex task for managers and researchers alike. …
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A Study of Electromagnetic Scattering of Communication Signals by Randomly Rough Surfaces
This research solves current RF propagation modeling gaps by modifying a single-frequency electromagnetic propagation analysis technique for use on communication signals and propagation channels. This research extended the Methods of Ordered Multiple Interactions (MOMI) algorithm to communication …
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A Technical and Policy Needs Analysis for Space Traffic Management of Low Lunar Orbit
… in Low Lunar Orbit using NASA's General Mission Analysis Tool and a GRAIL-based gravity model with 70 x 70 degree and order to propagate selenocentric orbits. These propagations are run using high performance computing through the MIT SuperCloud. Methods of preventing collisions are discussed …
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Structural health monitoring of polymer-matrix composites (PMCs) using embedded piezoelectric transducers: experimental and numerical approaches
… MUL2 in PoliTo, provides a robust foundation for analysis via plate and beam models of higher-order kinematics. The experimental phase was started with the self-heating tensile tests conducted on the composite specimens to estimate their fatigue limit through the conventional method (using the …
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Energy propagation in jammed granular matter
… on understanding phenomena of energy and force propagation. Analysis of energy propagation in a two-dimensional disordered system is carried out by considering the propagation of information away from an oscillating boundary which is characterized by both temporal and spatial structure. This …
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