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Investigation of thermal flame structure in lean turbulent premixed methane-air flames by Rayleigh scattering.Galley, Natalie. January 2006 (has links)
Thesis (M.A. Sc.)--University of Toronto, 2006. / Source: Masters Abstracts International, Volume: 45-03, page: 1547.
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A spectral method determination of the first critical Rayleigh number for a low-Prandtl number crystal melt in a cylindrical container /Dietz, Charles Miller, January 1993 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 118-122). Also available via the Internet.
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Mass diffusion in polymeric systems by forced Rayleigh scatteringWesson, Jeffrey Alan. January 1983 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1983. / Typescript. Vita. Description based on print version record. Includes bibliographical references (leaves 186-191).
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Anwendung der optischen Frequenzverdopplung in der PartikelmesstechnikMartinez Tomalino, Lars-Owe January 2009 (has links)
Zugl.: Erlangen, Nürnberg, Univ., Diss., 2009
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Étude, par diffusion Rayleigh dépolarisée, de corrélations d'orientation moléculaire : applications à la récupération assistée du pétrole et à l'étude d'un cristal liquide.Maelstaf, Pierre, January 1978 (has links)
Th.--Sci.--Bordeaux 1, 1978. N°: 579.
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Trapped modes in the presence of thin obstaclesRatcliffe, Keith January 2002 (has links)
In this thesis we use various techniques to investigate the occurrence of trapped modes in the presence of thin obstacles. Physically trapped modes are oscillations of finite energy in a fluid which is unbounded in at least one direction. These oscillations mainly occur locally to some structure and decay to zero at large distances away from it. Trapped modes are important as they have been found to exist in a wide range of physical situations. We consider a number of problems in two and three dimensions including waveguides containing bodies and arrays of identical structures. A modified residue calculus technique, a variational technique and a method based on the truncation of matched eigenfunction expansions are used to solve the problems, with numerous results presented.
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The study of Rayleigh scattering by glassBridge, N. J. January 1964 (has links)
No description available.
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Estudio de la convección penetrativa mediante el uso de PIV y videoLapi Jorquera, Bruno Alessandro January 2013 (has links)
Ingeniero Civil / Producto del enfriamiento durante la noche en lagos se produce a nivel superficial una delgada lámina de agua de mayor densidad, de la que comienzan a precipitar corrientes de agua más fría modificando la termoclina. Este fenómeno que se conoce como convección penetrativa y dicho proceso es gobernado por el equilibrio entre las fuerzas boyantes y fuerzas viscosas en presencia de un proceso de transferencia de calor en el fluido, descrito por cierto número adimensional conocido como el número de Rayleigh, Ra.
La convección penetrativa constituye uno de los principales mecanismos de transporte de energía en el sistema acuático, lo que a nivel estacional genera cambios en la hidrodinámica interna de estos. Sin embargo, se conoce poco acerca del comportamiento de las plumas termales que se generan a nivel diario y de cómo estas pueden afectar la estratificación existente.
Para ello se ha desarrollado una instalación experimental capaz de reproducir el fenómeno observado de manera equivalente, realizando ciclos de calentamiento enfriamiento en la base y no en la superficie como en los lagos. Para producir dichos ciclos, el sistema automatiza la entrada de agua caliente y fría al sistema generando variaciones sinusoidales de temperatura.
Para visualizar el fenómeno se utilizó Particle Image Velocimetry o PIV, del que se obtienen campos vectoriales de las velocidades producidas por las erupciones termales, las que han sido verificadas mediante una comparación con el ajuste realizado por Moses et al. (1993). Se realizaron por otro lado experiencias con la columna de agua estratificada, encontrando que la variación de la posición de la termoclina, z_T, producto de las erupciones termales, sigue un comportamiento muy similar al de la onda de temperatura impuesta, salvo por un desfase entre el mayor valor de z_T y la temperatura máxima. Además se comprobó experimentalmente la teoría planteada por Ihle & Niño (2012) que relaciona el tiempo de inicio de la convección con una potencia del número de Rayleigh mediante una constante, cuya parametrización también ha sido corroborada.
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An acoustic microscope using a Rayleigh-to-compressional conversion lens /Jen, C. K. January 1982 (has links)
No description available.
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In Situ Measurement and Emulation of Severe Mulitipath EnvironmentsDiStasi, Stephen 08 October 2008 (has links)
ABSTRACT For a variety of wireless sensor network applications, sensor nodes may find their received signal strengths dominated by small-scale propagation effects. Particularly impacted are applications designed to monitor structural health and environmental conditions in metal cavities such as aircraft, busses, and shipping containers. Small changes in each sensor’s position or carrier frequency can cause large variations in this received signal strength, thereby compromising link connectivity. We leverage a technique called Wireless Sensors Sensing Wireless (WSSW) in which wireless sensors act as scalar network analyzers in order to characterize their own environment. WSSW data can enable sensors to react to particularly bad fading, such as hyper-Rayleigh, by switching to a good channel or by implementing other mitigation techniques, such as utilizing a diversity antenna. In this work, the WSSW concept has been extended to accommodate mesh networks and include a spectrum analysis capability for recognizing potentially interfering wireless activity. The test of mitigation techniques is often problematic since application sites are far from controlled environments and are often difficult to access. To address this problem, we have developed a Compact Reconfigurable Channel Emulator (CRCE) to create a laboratory environment that is configurable to a variety of repeatable fading scenarios. With the CRCE, fading characteristics found at a specific wireless sensor network location may be replicated inside the chamber to discover the connectivity capabilities of the sensors and the effectiveness of diversity schemes (e.g., channel switching or multi-element antenna arrays).
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