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 73 for “"linear polarization"”.
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An Ultrawideband Dual-Linear Polarization Feed for Solar Microwave Observation
… The 2.4m RSTN dishes have feeds that are single polarization at four discrete frequencies between 1.4 and 8.8GHz. Expanding the capability of these existing dishes with a single ultrawideband feed to cover 1-10GHz would improve observations, while adding a dual polarization capability could …
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Measurement of Magnetic Fields From Linear Polarization of Dust Emission
… emission (RLeo, Orion IRc2) and studying the linear polarization of quasars.
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Analysis of signal-to-noise ratio of angle and degree of linear polarization in division of focal plane polarimeter
… has led to commercialization of single-chip polarization and color-polarization imaging sensors in the visible spectrum. Novel applications have arisen with the emergence of these sensors leading to questions about noise in the reconstructed polarization images. In this thesis, we provide …
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Assessment of In-situ Corrosion Conditions at Nevada Mechanically Stabilized Earth Wall Sites: Using Electrochemical Soil Characteristics and Linear Polarization Resistance
… electrochemical backfill characterization and linear polarization resistance (LPR) corrosion rate monitoring. Evaluation of electrochemical backfill characteristics has resulted in the discovery of six sites that fail current NDOT/ AASHTO MSE wall backfill requirements. The in-situ soil samples …
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Dual-polarization meteorological radar: theory and design
… in a matrix, and can be applied to systems using linear, circular, or elliptical polarization. The general formulation reduces to results previously published in the literature for linear polarization differential reflectivity (Z<sub>DR</sub>) and for circular polarization depolarization ratio ( …
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Mapping the interstellar magnetic field: Observations of the Goldreich-Kylafis effect towards late-type evolved stars and star-forming regions
… stars and star-forming regions. Observations of linearly polarized molecular line transitions arising from the Goldreich-Kylafis (G-K) effect provide valuable insight into the magnetic field geometry in these sources. Through observing with CARMA, the VLA, and ALMA, this dissertation addresses …
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The transfer of polarized radiation in astrophysical masers in the presence of magnetic fields
… for the first time make it possible to study the linear polarization of radiatively saturated masers when the stimulated emission rate and the Zeeman frequency are comparable, a regime which is of importance for nonparamagnetic masing molecules (i.e. $\rm H\sb2 O$, SiO, $\rm CH\sb3 OH$, $\rm H\sb2 …
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Correlation of corrosion measurements and bridge conditions with NBIS deck rating
… cover depths, resistance, corrosion potentials, linear polarization data, as well as environmental exposure and structural data were collected from a sample of 38 bridge decks in the Commonwealth of Virginia. These structures were further divided in three subsets: bridge decks with a specified …
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Spectropolarimetry of epsilon Aurigae: Probing Stellar and Disk Atmospheres
… in the disk. I evaluated spectral features and linear polarization in ESPaDOnS out-of-eclipse spectra in order to characterize line polarization observed in the system. It is important to understand the out-of-eclipse behavior in order to correctly differentiate signals seen in ESPaDOnS spectra …
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THE OPTICAL POLARIZATION OF QUASI-STELLAR AND BL LACERTAE OBJECTS
In this dissertation, I examine the optical linear polarization of quasi-stellar objects (QSOs) and BL Lacertae objects. I present extensive polarimetric observations of a large sample of QSOs, systematically analyze the correlations between polarization and other properties of QSOs, compare t
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A multiple polarization plane ZDR radar data acquisition system
… to measure differential reflectivity in multiple polarization planes. The radar uses a novel polarization switch which allows reflectivity measurements in any linear polarization. A dedicated microcomputer and a digital hardware system collect the reflectivity data in any of four pairs of …
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Effect of plastic strain on the corrosion of X65 pipeline steel
… and 20% plastic deformation were tested using linear polarization methods in a 10% NaCl, CO2 saturated environment. It was found that there was no impact from the amount of plastic strain on the general corrosion rate of the X65 steel.
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Filtering antennas based on rectangular dielectric resonators
… filtering responses, have been achieved for both linear polarization and dual polarization. All designs have been simulated and optimized using a full wave electromagnetic (EM) simulator, and results are compared and discussed.
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Measurement of the isovector giant quadrupole resonance in 208Pb using eleastic polarized photon scattering
… used highly polarized tagged photons to measure polarization asymmetries for elastic scattering in 208Pb in the energy region of the isovector giant quadrupole resonance (IVGQR). These measurements were performed at excitation energies between 16 and 30 MeV. Photons with enhanced linear …
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The Structure and Polarization Properties of the SiO Masers in the Extended Atmosphere of R Aquarii
… symbiotic binary R Aquarii. Four epochs of full-polarization observations were recorded using the Very Long Baseline Array a facility the National Radio Astronomy Observatory. The first high-resolution images of the extended atmosphere of a Mira variable in a symbiotic binary have been produced. …
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Extreme Ultraviolet Polarimetry with Laser-Generated High-Order Harmonics
… between 8 nm and 62 nm and easily rotatable linear polarization. The polarimeter will aid researchers at BYU in characterizing EUV thin films and improving their understanding of materials for use in EUV optics. This first-time workhorse application of laser high harmonics enables …
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The evaluation of corrosion inhibitors for the repair and rehabilitation of reinforced concrete bridge components
… drying. Corrosion rate measurements taken with a linear polarization device were used to monitor the inhibitors effectiveness. The effect of the admixtures on the concrete properties, and the effect of the surface applied inhibitors on the overlay bond strength were evaluated. Rapid freeze-thaw …
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Log-Periodic Loop Antennas
… numerical analysis. The LPLA-GR also provides linear polarization and unidirectional patterns. Three prototype antennas were constructed and measured in the Virginia Tech Antenna Laboratory. Far-field patterns and input impedance were measured over a wide range of frequencies. The measured …
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Electrochemical corrosion testing of boronized and unboronized steels
… steels were also tested in these solutions. Linear Polarization, Tafel plots and Cyclic Polarization were the three techniques used to analyze the corrosion resistance of boronized and unboronized steels. Comparative studies revealed increase in corrosion resistance of AISI 1018 by 3-8 times, …
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Estimation of Spacecraft Attitude Motion and Vibrational Modes Using Simultaneous Dual-Latitude Ground-Based Data
… input vibrational frequencies from the degree of linear polarization. The main results are that dual-site observation geometry is conducive to slight improvements of attitude filter performance, and the addition of polarimetric data to the measurements yields much improved performance over both …
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