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 17 of 17 for “"High noise levels"”.
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Experimental determination of the impulse response function for elastic vibrating systems
… to be unbiased in the presence of measurement noise. Modal parameters are extracted from impulse response estimates using a modification of the Pisarenko harmonic decomposition method. The advantages of a time-domain approach over traditional Fourier analysis procedures, including avoidance of …
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Study of resonant charge transfer
… to improve precision and permit measurement at high noise levels. A description of the apparatus is provided. Consideration of other systems and the suitability of their resonant charge transfer reactions for experimental investigation is discussed. Various theoretical models for estimation of …
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Spatial variability of the ambient noise field associated with the Marginal Ice Zone and its relationship to environmental parameters
… Greenland Sea Marginal Ice Zone (MIZ) . Ambient noise "hot spots" or concentrated areas of relatively high noise levels were found along the ice edge using a towed array. Ambient noise levels were obtained on 27 and 28 July using AN/SSQ-57A and AN/SSQ-57XN5 calibrated sonobuoys . The temperature …
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Design and manufacturing of a microcalorimeter for measuring heat flows in electrochemical reactions to milli-Kelvin precision
Due to their high energy density, lithium-air batteries have tremendous potential for application to batteries for electric vehicles. While significant efforts have been made in understanding the material origins of electrochemical performance under discharging and charging conditions, there is …
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An attampt to measure the electron temperature of a Xenon Chloride excimer laser discharge plasma by Thomson scattering
… transverse discharge laser to the short, high power Nd:YAG pulse to within 5 ns. Attempts were made to determine the electron velocity distribution of the discharge plasma of this Xenon Chloride laser using the method of Thomson scattering. The Thomson scattering parameter a was 0.22. A …
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Active pixel sensors for X-ray astronomy
… that can produce the best imager. Dark current, noise, and responsivity of the various pixel designs was measured using an electronics system adapted from a CCD test system. X-rays were detected at room temperature. Ordinary active pixels have high noise levels ( 70 electrons). Many pixel designs …
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Entrainment Characteristics of Turbulent Round Gas Jets Submerged in Water
… estimated using the PIV measurements is higher than the respective values suggested by a common empirical model developed for singlephase buoyant jets. A two-phase theoretical entrainment model used for comparison shows an overestimation of entrainment, but predicts the increase in the …
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The Assessment of Stream Discharge Models for an Environmental Monitoring Site on the Virginia Tech Campus
… regression index velocity models also showed high correlation (r2 = 0.98) values, high noise levels of the parameter index velocity (Vi) complicated their use for the determination of discharge. Because of its reliability, low variance and accessibility to students, the stage-discharge model …
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Flow induced acoustic resonances in heat exchangers.
… exchanger can result in the production of very high noise levels, which occur as a result of the excitation of an acoustic standing wave in the cavity between the tube rows. This acoustic vibration can occur in large and small heat exchangers alike, resulting in drastically impared performance …
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Wastewater-Based Genomic Epidemiology
… the mixed nature of samples, degraded RNA, and high noise levels. This thesis addresses these challenges by developing and validating statistical and computational methods specifically tailored to wastewater genomic surveillance, and by rigorously evaluating their robustness and epidemiological …
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Control of acoustics and store separation in a cavity in supersonic flow
… related problems, one being the high noise levels inside the cavity and the other being the return of a store into the cavity after being released from inside. This thesis provides a systematic framework to understand the dominant physics in both problems and to provide solutions …
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Robust and Cross-Domain Anomaly Detection and Mitigation
… low recall rates, extreme class imbalance, and high noise levels persist. The success of mitigation closely depends on the detection phase. As a strategy to enhance anomaly detection, developing a system that creates an ideal environment for this purpose is proposed. In the realm of supply chain …
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Analytical and simulation performance modelling of indoor infrared wireless data communications protocols
… IR spectrum provide the potential for very high-speed wireless communication with good security. However IR links have a limited range and are susceptible to high noise levels from ambient light sources. The Infrared Data Association (IrDA) has produced a set of communication protocol …
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Riemannian geometry for inverse problems in cryogenic electron microscopy
… main challenges in orientation estimation: the high noise levels present in Cryo-EM data and the non-convexity of typical variational problems for estimating orientations. To overcome these challenges jointly, we construct a new regularised global optimisation scheme to solve a variational …
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Effects of urban noise on vocalisations of tūī (Prosthemadera novaeseelandiae) : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Conservation Biology at Massey University, Auckland, New Zealand
… these vocal signals are masked by anthropogenic noise, their signal efficiency is reduced and this may result in direct negative fitness consequences. Therefore knowledge on how urban habitat features including anthropogenic noise affect avian vocal communication is important in understanding the …
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Identifying Ionospheric Scintillation in the South Atlantic Magnetic Anomaly using motion-affected GPS data from a ship-based receiver
… latitudes, resulting in the precipitation of high-energy particles into the ionosphere during geomagnetic storms. Ionospheric scintillations are rapid fluctuations in the phase and amplitude of trans-ionospheric radio signals resulting from electron density variations along the ray path. As a …
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Étude numérique et expérimentale du comportement non linéaire des plaques perforées en présence d’écoulement
Cette thèse étudie expérimentalement la réponse acoustique de plaques macro-perforées (pourcentage de surface ouverte (POA) jusqu’à 40% et diamètre jusqu’à 3 mm), en présence d’un écoulement rasant et soumis à des niveaux de pression acoustique (SPL) élevés jusqu’à 180 dB. Tout d’abord, une méthode …