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 29 for “"Atmospheric effects"”.
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Post-atomic Auralities: A practice-based study of sound and atmospheric effects
… This research aims to discover how sound and atmospheric conditions interact within sites of nuclear significance and explores the often complex and unique cultures and consequences that emerge from them. This process includes exploring places that are imbued with nuclear histories, many of …
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Research on the science and politics of the atmospheric effects of aviation debate
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Analysis of Atmospheric Effects Due to Atmospheric Oxygen on a Wideband Digital Signal in the 60 Ghz Band
… the 60 GHz band. This band is plagued with high atmospheric absorption due to atmospheric oxygen, but has a lot of bandwidth, which makes it desirable for multi-media applications. Recently, research of wideband digital links within the 60 GHz band gained the interest of the wireless …
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The impact of volcanic halogens, climate change, and sulfate aerosol geo-engineering on the atmospheric effects of volcanic eruptions
… sulfate aerosol geo-engineering would alter the atmospheric effects of sulfur-only explosive volcanic eruptions has, previously, been under-researched. In this thesis, aerosol-chemistry-climate model simulations are utilised to show that the co-emission of volcanic halogens alongside sulfur …
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Aerodynamic Study of Forces due to Wind Velocity and Angle of Attack on Parabolic Solar Troughs
<p>Scant literature exists of the atmospheric effects on parabolic solar troughs. The technology is relatively new, so supporting studies by consequence are as well.</p> <p>This study examines the effects of wind at various speeds, with various angles of attack on parabolic solar troughs. This …
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A multi-loop guidance scheme using singular perturbation and linear quadratic regulator techniques simultaneously
… controlled high-performance missile without atmospheric effects, and for a single-stage-to-orbit hypersonic vehicle with both elevator and thrust-vector control. It is shown that the control algorithm results in a pitch loop feedback controller that is robust and very stable, and is at least …
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Presnosť určenia parametrov exoplanét z ich tranzitov
… five exoplanets were observed under varying atmospheric and instrumental conditions. For the subsequent analysis, we employed the open-source Python package Pylightcurve and the Exoplanet Transit Database (ETD), which not only modeled the light curves but also facilitated data collection. The …
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Exoplanet Atmospheric Characterization using High-Precision Photometry
… JWST, and PLATO. It is demonstrated that the atmospheric effects are best measurable for exoplanets around later spectral types. In addition to that, I present an original exploration of the possibility of extracting out spectral features within single-band photometric imaging of stars. It is …
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Investigating the low-frequency stability of BiSON's resonant scattering spectrometers
… with a detailed treatment of terrestrial atmospheric effects and a model of the solar surface velocity field. The resulting simulation allows for the development of a new and successful correction for differential atmospheric extinction generating up to a 25% increase in the …
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Characterisation of thin-film semiconductors for device application
… of film growth may be inferred.<br/><br/>The effects of ambient atmosphere on optoelectronic properties have been investigated for films prepared over a range of deposition conditions, such as silane concentration, doping and film thickness. It was found that both irreversible and reversible …
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Highly Physical Solar Radiation Pressure Modeling During Penumbra Transitions
… radiation pressure with Oblateness and Lower Atmospheric Absorption, Refraction, and Scattering (SOLAARS). The fundamental geometry and approach mirrors past work, where the solar radiation field is modeled using a number of light rays, rather than treating the Sun as a single point source. …
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Cavity Ringdown Spectroscopy in Nitrogen/Oxygen Mixtures in the Presence of Alpha Radiation
… models under development for radiation-induced atmospheric effects. Cavity Ringdown Spectroscopy (CRDS) was used to measure the concentration of chemical products generated as a result of radiation interactions in a controlled atmosphere. Experiments were conducted in a vacuum chamber interfaced …
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Modeling Of Atmospheric Refraction Effects On Traffic Noise Propagation
Traffic noise has been shown to have negative effects on exposed persons in the communities along highways. Noise from transportation systems is considered a nuisance in the U.S. and the government agencies require a determination of noise impacts for federally funded projects. There are several …
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Land Surface Phenologies and Seasonalities Using Cool Earthlight in Temperate and Tropical Croplands
… Passive microwave data are less sensitive to atmospheric effects, cloud contamination, and solar illumination constraints resulting in finer temporal resolution suitable to track the temporal progression of cropland cover development compared to the VNIR data that has coarser temporal …
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Theory, design and implementation of a digital receiver for the Advanced Communications Technology Satellite (ACTS) beacons
… measurement data will be used to characterize atmospheric effects on signal propagation at Ka band. Each APT system will contain two identical, independent digital receivers; one 20 GHz channel and one 27.5 GHz channel. The algorithm implemented on each receiver utilizes the results of multiple …
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Exploitation of infrared polarimetric imagery for passive remote sensing applications
… backgrounds under unknown illumination and atmospheric effects. A method based on mathematical morphology is proposed with the intent to enhance the polarimetric Stokes features of manmade structures found in the scene while minimizing its effects on natural clutter. The method suggests that …
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On the Atmospheric Saliency of Space Debris Reentries: Estimating Distribution, Lifetime and Radiative Forcing of Reentry-Ablated Alumina
… space objects are often removed from LEO via atmospheric reentry. During reentry, unshielded satellites and rocket bodies experience extreme heating loads and material ablation, depositing small metallic particles in atmosphere. These particles can remain suspended in the atmosphere and …
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Effect of interfacial thermal conductance and fiber orientation on the thermal diffusivity/conductivity of unidirectional fiber-reinforced ceramic matrix composites
… heat transfer at the interface. However, no atmospheric effects were observed for composites with fibers without the carbon coating due to very strong bonding between the fiber and the matrix. HIP'ing increased the thermal diffusivity/conductivity of the composites due to densification of the …
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Development and Testing of A Space-borne GPS Signal Strength Sensor
… strength in the studies on the ionospheric and atmospheric effects and irregularities which cause GPS signal degradation and scintillations.
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