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 318 for “"Irregularities"”.
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Estimations of rail irregularities
… cars that have been used to measure rail irregularities are costly and need operators. This thesis proposes a method to estimate rail irregularities by measuring accelerations of a passenger car instead of direct measurement by using a conventional inspection car. Using a System …
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An Investigation of Equatorial 150-Km Irregularities
*The dissertation includes a CD that requires the following applications: Adobe Acrobat, WinZip.
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High-Latitude Ionospheric Irregularities Characterized Through Machine Learning Methods
… and data-driven techniques to understand plasma irregularities in high-latitude regions better. By combining observations and recent findings from modeling, the goal is to identify and classify scintillation signatures caused by different types of irregularities in the ionosphere. The focus is on …
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Radio Propagation Through Density Irregularities in the Auroral Ionosphere
… to investigate the impact of ionospheric density irregularities on radio wave propagation by studying their characteristic features and ionosphere conditions during radio scintillation. We employ a modeling approach using a radio wave 3D propagation model: Satellite-beacon …
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Radio and Optical Techniques for Locating Equatorial Plasma Irregularities
… latitudes. These depletions contain density irregularities of scales ranging from a few centimeters to thousands of kilometers. Spread-F, the disruption of ionospheric measurements with ionosondes and incoherent scatter radar, and scintillation (fading) of trans-ionospheric radio …
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Effects of Surface Irregularities on the Underground Stress Field
Made available in DSpace on 2014-12-10T17:57:49Z (GMT). No. of bitstreams: 1 6711927.pdf: 2925981 bytes, checksum: 54622b2dd5382eb8d9f6c8568df7ecca (MD5) Previous issue date: 1967
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The Analysis and Creation of Track Irregularities Using TRAKVU
… An important part of the track input is the irregularities that exist on actual track. This study analyzes the irregularities inherent in railroad track geometry data, and provides an analytical method for creating track data with the irregularities for use as the input to a dynamic model. …
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Formation of small-scale irregularities in the auroral E region
… mechanisms of small scale (meter and decameter) irregularities in the auroral E region is advanced, both theoretically and experimentally. In the theoretical part of the thesis, the linear fluid theory of the Farley-Buneman (F-B) and gradient drift (G-D) plasma instabilities is considered. A …
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Investigating the role of reportable irregularities in South African audit
… for South African auditors to report certain irregularities to an independent regulatory body. Detailed interviews with some of the country’s leading minds in auditing and corporate governance illustrate how a whistle-blowing duty impacts the functioning of quality control systems. Although …
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Finite Element Modeling of Strain Localization Initiated by Geometric Irregularities
The localization of deformation into zones of intense straining, known as shear bands, is a common phenomenon in inelastic deformation. The modeling of this phenomenon by the finite element method is hampered by a number of factors; the lack of a priori knowledge of the location, direction, and …
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Effects of Surface Irregularities on the Rolling Contact Stress Problem
Made available in DSpace on 2014-12-12T00:25:47Z (GMT). No. of bitstreams: 1 7212216.pdf: 1724787 bytes, checksum: 2bf0eb582dc2adeaedcab98427e90923 (MD5) Previous issue date: 1971
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Scattering of coastal-trapped waves by irregularities in coastline and topography
… which estimates the severity of the topographic irregularities. The scattering is amplified by density stratification. A comparison of the effects of widening and narrowing topographies shows that the gross scattering effects of 'reciprocal' topographies are qnite similar. Within the scattering …
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Investigation of High Latitude Ionospheric Irregularities utilizing Modeling and GPS Observations
… coupling mechanisms result in high latitude irregularities that are difficult to characterize. Until recently, the polar and auroral irregularities remained largely unexplored. Inadequate infrastructures to deploy and maintain advanced dual frequency Global Navigation Satellite System (GNSS) …
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Effect of Small Initial Irregularities on the Strength of Cylindrical Shells
Made available in DSpace on 2015-05-12T17:06:14Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0004488.PDF: 4148137 bytes, checksum: f844fa2c0329af6eec0d79e73fcd9c17 (MD5) Previous issue date: 1952
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The Effect of Surface Irregularities on The Elastohydrodynamic Lubrication of Sliding Line Contacts
A method for studying the effects of surface irregularities on the elastohydrodynamic (EHD) lubrication of sliding line contacts is presented. A series of case studies illustrates the effect of furrow, asperity, and wavy surface irregularities on the pressure distribution, film thickness, and …
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Remote Sensing of Irregularities in the Equatorial Ionosphere Using the Radio Scintillation Technique
… sense the characteristics of the ionospheric irregularities. This is done by considering both statistical and deterministic models for the scintillation producing irregularities. The models are combined with existing propagation theory using analytical and numerical simulation techniques in …
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An examination of ionospheric plasma irregularities detected by the mid-latitude SuperDARN radars
… shows that different types of ionospheric irregularities are being observed in the mid-latitude region. One type of irregularity is clearly subauroral and equatorward of the plasmapause. Fitting a convection pattern to the Doppler velocities associated with subauroral ionospheric scatter …
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