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 265 for “"sweeping"”.
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Interior Node Projection Techniques in Sweeping Algorithms
The enhancement of node projection techniques in sweeping is the subject of this thesis. Sweeping is a method used to produce all-hexahedral finite element meshes on certain classes of geometry. The placement of nodes in the interior of the geometry during the sweeping process remains a difficult …
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Contaminated Sweeping Langmuir Probes on Sounding Rocket Platforms
<p>Sweeping Langmuir Probes (SLPs) are one of the most commonly used probes on sounding rocket missions. They offer measurements of plasma density, electron temperature, and both relative and absolute payload charging. One of the major implementation challenges, however, is contamination on the …
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Variational analysis and optimal control of the sweeping process
… and study an optimal control problem for the sweeping(Moreau) process, where control functions enter the moving sweeping</p> <p>set. To the best of our knowledge, this is the first study in the literature devoted to optimal control of the sweeping process. We first establish an existence …
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Street Dust : implications for stormwater and air quality, and management through street sweeping.
… (2) Develop an understanding of available street sweeping technologies and their relative efficacy, (3) Extrapolate the relative efficacy of multiple street sweeping technologies to the context of environmental/ecological and human health risk, and (4) Provide recommendations for future research …
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Sweeping Exposures: Lead Poisonings and Black Working Poor Populations in the United States
<p>The focus of my thesis is to explore some of the realities that the impoverished urban black poor populations face in America today. The goal of my thesis is to illustrate how poverty is reproduced within impoverished neighborhoods through the idea and mechanism of <em>lead exposure</em>, by …
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Characterization of a Magnetically Contained Hot Filament Plasma Source with a Wide-Sweeping Langmuir Probe
… made to remedy both problems. A wide-range Sweeping Langmuir Probe was developed with a ±35 V sweeping range to fully analyze ion and electron saturation regions in the entire IV curve. A method was derived to estimate the chamber source’s filament temperatures. The new Langmuir probe was …
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Potential and Quantification of Street Sweeping Pollutant Reductions towards addressing TMDL WLAs for MS4 Compliance
… meet total maximum daily loads (TMDLs). Street sweeping is potentially an effective BMP since streets exist throughout urban watersheds, often are directly connected to the storm sewer, and are found to contain an abundance of contaminants. Although pollutant removal from street sweeping has …
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Waste collection & street-sweeping route optimization using a 2-stage cluster algorithm & heuristic approaches
Waste collection and street-sweeping play a vital role in public health, safety, and overall cleanliness. Since these processes cannot be ignored, they should be done in an efficient manner. The following thesis proposes a novel 2-stage clustering approach, namely the Static and Dynamic Clustering, …
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All Hexahedral Meshing of Multiple Source, Multiple Target, Multiple Axis Geometries Via Automatic Grafting and Sweeping
… of high accuracy with a low node count. Sweeping is one of the most widely used algorithms for generating all-hex meshes. A limitation of sweeping, however, is that it can currently be applied only to prismatic or extruded geometry types. This thesis develops a method to combine sweeping …
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Numerical Simulations of Flow past a Triangular Airfoil and in a Sweeping Jet Actuator Using Different Turbulence Models
… airfoil used for a Mars air vehicle and in a sweeping jet actuator used for active flow control. Simulations are performed using the commercial CFD software ANSYS Fluent.</p> <p>The thesis consists of two parts. The first part of the thesis deals with the CFD simulations of a triangular …
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Fast Sweeping Methods for Steady State Hyperbolic Conservation Problems and Numerical Applications for Shape Optimization and Computational Cell Biology
… and the capability to resolve shocks. Fast sweeping methods are efficient iterative numerical schemes originally designed for solving stationary Hamilton-Jacobi equations. Their efficiency relies on Gauss-Seidel type nonlinear iterations, and a finite number of sweeping directions. We …
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Oxygen Transport Membrane Reactors for Oxy-Fuel Combustion and Carbon Capture Purposes
… OTMs under modified membrane temperatures, sweeping gas flow rates, sweeping gas compositions, membrane configurations, and membrane compositions. When utilizing a pure CO2 sweeping gas, the membrane composition was modified with the addition of Sm0.2Ce0.8O1.9-δ (SDC) at varying wt.% to …
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Characterisation of imperfections in single crystals of high purity synthetic quartz
… which had been treated by electrodiffusion, or sweeping. Crystal lattice strain and sweeping damage was studied using double crystal topography at the Synchrotron Radiation Source, (SRS), at the Daresbury Laboratory. Metal ion impurities were shown to incorporate interstitially into quartz …
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Capability Memory Protection for Embedded Systems
… cycle overhead and DRAM traffic. To make sweeping revocation feasible, I introduce new architectural mechanisms and micro-architectural optimisations to substantially reduce the cost of memory sweeping and capability revocation. Another factor of the cost is the frequency of memory …
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A novel approach for route generation and real-time scheduling for public services
Snowplowing and sweeping are essential services to municipalities, which affect travel safety, environment protection, and health to residents. To provide acceptable quality services, route optimization is one of the key strategies that allow for enhancing efficiency, saving costs, and balancing …
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Visualization of a plane sweep algorithm for construction of the visibility graph for robot path planning
… for solving this problem is based on a plane-sweeping technique and runs in O(N{dollar}\sp2{dollar} log N) time; Since this solution has been studied very briefly in its theoretical form by (SS84), we present an in-depth analysis of the plane-sweep algorithm along with a full-scale …
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Coverage Path Planning And Control For Autonomous Mobile Robots
… of the smooth trajectory is done. Cooperative sweeping of multirobots is achieved by dividing the area to be covered into smaller areas depending on the number of robots. Once the area is divided into sub areas, each robot is assigned a sub area for cooperative sweeping.
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Review of flapping foil actuation and testing of impulsive motions for large, transient lift and thrust profiles
… All three trajectories included a smooth sweeping motion, but the third trajectory included a subsequent sharp change in pitch. This sharp change in pitch, or pure rotation, produced sharp force peaks and oscillations in thrust, in addition to force peaks from the sweeping motion which …
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Dynamic user motion prediction using advanced Kalman filtering in 5G mmWave systems
… historical user trajectories through beam sweeping, user tracking via sensor-based information combined with beam sweeping, and Kalman Filter-based prediction to address these challenges effectively. By leveraging key measurements such as Angle of Arrival (AoA), Received Signal Strength …
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Langmuir Probe Instrument Suite for Mesosphere Turbulence Experiment Mission
… third implementation is a typical cylindrical sweeping Langmuir probe.</p> <p>Amongst the fixed bias Langmuir probe implementations, the multi-needle fixed bias Langmuir probe is a collection of three fixed bias needles at distinct voltages in the electron saturation region that can together …
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