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 13 of 13 for “"Atmospheric attenuation"”.
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ACTS radiometers and a comparison of atmospheric attenuation derived form temperature-humidity and radiometric data
… These radiometers are used to set clear sky attenuation reference levels for satellite beacon calibration. This thesis describes the design, implementation and testing of the radiometers built at Virginia Tech. In addition, a mathematical algorithm used for the prediction of clear sky …
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Išorinio poveikio įtaka terahercų taikymams telekomunikacijose /
… wireless networks were examined in terms of the atmospheric attenuation, mostly rain attenuation and variations of atmospheric refractive index. Also, one of the most probable technological scenarios (short distances and quasi-optical transmission) was investigated. The results were compared with …
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Impact of external effects on terahertz applications for telecommunications /
… wireless networks were examined in terms of the atmospheric attenuation, mostly rain attenuation and variations of atmospheric refractive index. Also, one of the most probable technological scenarios (short distances and quasi-optical transmission) was investigated. The results were compared with …
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Evaluation of the Aerodynamic and Acoustic Performance of a Novel Passive Bat Deterrent for Wind Energy Applications
… active acoustic bat deterrents constrained by atmospheric attenuation, preventing full coverage of the rotor swept area. Passive ultrasonic deterrents integrated along the length of turbine blades offer a potential alternative, but their aerodynamic impact has not been thoroughly investigated. …
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Terahertz wireless communication
… and dust exhibit a spectral dependence in the atmospheric attenuation, the corresponding impact on THz in comparison with IR communications is not equivalent. Simulation results of attenuation by fog and dust in the millimeter and sub-millimeter waveband (from 0.1 to 1 THz) and infrared …
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Optimization of central receiver concentrated solar thermal : site selection, heliostat layout & canting
… losses, shading & blocking, aberration and atmospheric attenuation. The model is based on a discretization of the heliostats and can be viewed as ray tracing with a carefully selected distribution of rays. The prototype implementation is sufficiently fast to allow for field optimization. In …
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AN APPROACH TO ESTIMATE GLOBAL BIOMASS BURNING EMISSIONS OF ORGANIC AND BLACK CARBON FROM MODIS FIRE RADIATIVE POWER
… is an important global phenomenon affecting atmospheric composition with significant implications for climatic forcing. Wildland fire is the main global source of fine primary carbonaceous aerosols in the form of organic carbon (OC) and black carbon (BC), but uncertainty in aerosol emission …
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Terahertz Detectors and Imaging Array with In-Pixel Low-Noise Amplification and Filtering in CMOS technologies
… space which presents several challenges due to atmospheric attenuation, spurious reflections and diffractions, beam shaping, and so on. Moreover, background noise is also significant considering that the detected signal is typically in the order of a few microvolts. In this regard, an overview …
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Variation in wing area and prey detection volume of Rhinolophus Capensis in response to different climates
… a target and generate an audible echo despite atmospheric attenuation. High-duty cycle (HDC) pulses, calls with longer durations than the interval between them, are particularly useful in environments with high amount of environmental clutter. HDC echolocators use an acoustic fovea and Doppler …
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3D Micromachined Passive Components and Active Circuit Integration for Millimeter-wave Radar Applications
… applications as automotive radars, in remote atmospheric sensing applications, as landing radars for air and spacecraft, and for high precision imaging applications. Mm-wave radar systems have high angular accuracy and range resolution, and, while susceptible to atmospheric attenuation, are …
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Target strength of bat prey in relation to pulse frequency and vegetation density in bat species, Rhinolophus fumigatus (Rüppell's horseshoe bat)
… were then calculated after accounting for atmospheric attenuation and non-parametric tests were conducted as the data did not meet the requirements for parametric tests, even after normalisation techniques were applied. Within lineage and species analysis showed no significant difference in …
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Habitat correlates of pulse parameters in the highly specialised acoustic system of Chiroptera
… pulses because they are less susceptible to atmospheric attenuation making them more suited to long distance prey detection. Previous research has therefore focused on the methods by which bats vary the frequency of their pulses to achieve optimal propagation distances. However, the source …
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Geographic variation in the phenotype of an African horseshoe bat species, Rhinolophus damarensis, (Chiroptera: Rhinolophidae)
… The influence of prey detection range and atmospheric attenuation was also investigated. The results showed no evidence for JR or for random genetic drift. Body size was neither correlated with RF nor environmental variables, suggesting that variation in RF was not the result of concomitant …