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Your search for Keyword wave propagation resulted in 17 match(es).

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The biostimulatory effect of bulls on postpartum follicular wave development in postpartum, anestrous, suckled beef cows: Author: Wilkinson, Jarrod Robert Charles; Date: 2009-08-15; Program: Animal and Range Sciences; Abstract: The objective of this experiment was to determine if bull exposure influences follicular wave dynamics in primiparous, postpartum, anestrous, suckled, beef cows exposed to bulls. In Experiment 1, cows were exposed (continuously 24 h/d), (EB; n = 5) to bulls or not exposed to bulls (NE; n = 5) throughout the experimental period. In Experiment 2, cows were exposed to bulls for either 12 h, (EB12; n = 15), 6 h, (EB6; n =14) or not exposed to bulls (NE; n = 10) from the start to the end of the experimental period. In Experiments 1 and 2, cows were 67 d ± 3.8 (mean ± SE)...; Download File | View full details

A comprehensive Bayesian approach to gravitational wave astronomy: Author: Littenberg, Tyson Bailey; Date: 2009-05-15; Program: Physics; Abstract: The challenge of determining whether data from a gravitational wave detector contains signals which are cosmic in origin is the central problem in gravitational wave astronomy. The "detection problem" is particularly challenging for low amplitude signals embedded in "glitchy" instrument noise. It is imperative that we can robustly distinguish between the data being consistent with instrument noise alone, or noise and a weak gravitational wave signal. In response to this challenge we have set out to develop a robust, general purpose approach that can locate and characterize ...; Download File | View full details

Microwave Planer-Probe Traveling-wave Power Dividing-Combining: Author: Dickman, Edward John; Date: 2005-12-15; Program: Electrical Engineering; Abstract: TAs the millimeterwave and sub-millimeterwave portions of the electromagnetic spectrum are increasingly utilized, the need for greater power at those frequencies also increases. Unfortunately, as frequency is increased, the power available from a single solid-state device decreases. Thus, in many applications, the combining of power from several solid-state devices becomes necessary to have usable signal power levels. This thesis presents two such power combining approaches, whose designs are compatible with existing microfabrication techniques that may be used to produce devices operating at ...; Download File | View full details

Data Analysis for Space-Based Gravitational wave Detectors: Author: Crowder, Jefferson Osborn; Date: 2006-05-15; Program: Physics; Abstract: With the launch of the Laser Interferometer Space Antenna (LISA) expected for the next decade, the nascent field of gravitational wave astronomy will be taking a giant leap forward. The data that will be gathered from space-borne gravitational wave detectors such as LISA will provide an expansive look through a new window on the Universe. This dissertation is presented to help open that window by exploring some of the techniques and methods that will be needed to understand the data from these detectors. The first original work presented here investigates the resolution of LISA and follow-on s...; Download File | View full details

Gravitational wave Astronomy using Spaceborne Detectors: Author: Rubbo, Louis Joseph; Date: 2004-08-15; Program: Physics; Abstract: This dissertation explores the use of spaceborne gravitational wave detectors as observatories for studying sources of gravitational radiation. The next decade will see the launch of the first space-based gravitational wave detector. Planning for several follow on missions is already underway. Before these observatories are constructed, extensive studies into their responses, expected output, and data analysis techniques must be completed. In this dissertation these issues are addressed using the proposed Laser Interferometer Space Antenna as an exemplary model. The first original work present...; Download File | View full details

An investigation into student understanding of longitudinal standing waves: Author: Dostal, Jack Alan; Date: 2008-12-15; Program: Physics; Abstract: This study investigates the difficulties that introductory university physics students have with the concept of longitudinal standing waves in the context of standing waves in pipes. My goal is to identify difficulties that persist even after standard instruction on longitudinal standing waves and attempt to improve upon that method of instruction. The study follows a four-step design. I first use exploratory surveys and interviews with students to elicit the difficulties present in students' understanding of longitudinal standing waves in pipes. I then use the information gained to create an...; Download File | View full details

Wingbeat Modulation Detection of Honey Bees using a Continuous wave Laser System: Author: Scheppele, Ryan Hall; Date: 2006-08-15; Program: Electrical Engineering; Abstract: Using operant conditioning, researchers at the University of Montana have developed a technique for training entire colonies of honeybees to actively seek out explosive devices. The problem with this method of detecting explosives is that bees are difficult to track due to their small size. In an experiment in 2003, it was shown that a pulsed laser system could be used to detect bees; unfortunately this pulsed laser lacked the ability to resolve wingbeat modulation in the backscattered light. This thesis describes the development of a monostatic, continuous-wave laser system capable of detecti...; Download File | View full details

A Novel Optical Transmission Method using an Inline Phase Modulator: Author: Dong, Yanchang; Date: 2006-05-15; Program: Electrical Engineering; Abstract: This thesis presents a novel optical communication technique that provides a second, low data rate channel on an existing high-speed fiber optic link. The second channel is derived using an acousto optic fiber phase modulator and interferometeric receiver. This method modulates the optical phase of the primary high speed optical signal with a low frequency sine wave. At the receiving end of the low speed path, an interferometer and band pass fiber are used to recover the low-speed signal. Information is carried on the low frequency sine wave by use of FSK modulation. The method is noninvasive ...; Download File | View full details

Slope scale modeling of snow surface temperature in topographically complex terrain: Author: Staples, James Mark; Date: 2008-12-15; Program: Civil Engineering; Abstract: In mountainous terrain, landscape can influences the thermal state of snow. Snow temperature and mass flux have been calculated using an energy balance model, Radtherm/RT, to account for the effects of topography and meteorological conditions. For a specific location, a terrain model is defined and contains a connected assemblage of elements or facets. Each element has a specified terrain type with assigned thermal properties. Meteorological data are applied, and a one dimensional energy balance is calculated for each element. This energy balance includes conduction, convection, radiation, and...; Download File | View full details

A Planer Probe Double Ladder waveguide for Power Combining and Dividing: Author: Oudrhiri, Mohammed Adil; Date: 2004-05-15; Program: Electrical Engineering; Abstract: This thesis presents an initial investigation of a planar probe double ladder power combiner / divider. The structure is analogous to the coaxial double ladder of Sanada, Fukui and Nogi*. The planar probe structure utilizes a series of planar transmission lines and probes to inject or receive power which is combined or divided inside a rectangular waveguide cavity. The structure was developed in a manner for its eventual implementation at W-band (75.0-110.0 GHz) frequencies and above using proven micromachining techniques. A combination of analytical modeling, transmission line analysis and fu...; Download File | View full details

Anti-Stokes generation in a continuous wave raman laser: Author: Murphy, Sytil Kathleen; Date: 2008-08-15; Program: Physics; Abstract: The continuous-wave Raman laser system differs from other Raman systems in that it uses cavity enhancement to augment the pump laser source rather than a high-power pulsed laser source. Through interactions of the pump laser with the Raman active medium, all Raman systems can produce both red-shifted, Stokes, emission and blue-shifted, anti-Stokes, emission. Previous, continuous-wave Raman laser systems have focused on the Stokes emission. This dissertation presents theory and data on the anti-Stokes emission. Specifically, it investigates the anti-Stokes mode structure and the emitted power a...; Download File | View full details

Mode-Locked Ramam Laser in H2 Pumped by a Mode-Locked External Cavity Diode Laser: Author: Xiong, Yihan; Date: 2007-08-15; Program: Physics; Abstract: In this thesis, a theory is first presented for a far-off resonance mode-locked Raman laser in H2 with high finesse cavity enhancement. The theoretical derivation for the mode-locked Raman laser is based on semiclasscial laser theory and time-dependent continuous wave (CW) Raman theory. Numerically calculated results, including the intracavity fields' amplitude and phase evolution and output Stokes power versus input pump power are discussed in three different regimes depending on the relationship between the coherence dephasing rate and the repetition rate of the mode-locked pump laser. Then...; Download File | View full details

Mathematical modeling and performance evaluation of soliton-based and non-soliton all-optical WDM systems: Author: Kota Pavan, Sriharsha; Date: 2008-12-15; Program: Electrical Engineering; Abstract: This thesis presents a performance evaluation of soliton and non-soliton based all-optical wavelength Division Multiplexed (WDM) networks assuming the existing infrastructure (e.g., fiber and other physical layer components). The performance evaluation is carried out by a conveniently defined Quality (Q) factor, which is a measure of the signal to noise ratio, and indirectly, the bit error rate (BER) of the system. A solution to the Nonlinear Schrödinger Equation (NLSE), describing the propagation of light inside a fiber with linear and nonlinear impairments is found mathematically fr...; Download File | View full details

Effects of Acclimation on Poststocking Dispersal of Age-1 Pallid Sturgeon: Author: Oldenburg, Eric William; Date: 2008-05-15; Program: Biological Sciences; Abstract: A propagation program for pallid sturgeon Scaphirhynchus albus in the upper Missouri River was implemented by the U. S. Fish and Wildlife Service in 1997. Preliminary research indicated that many hatchery-reared pallid sturgeon were experiencing significant downstream poststocking dispersal, negatively affecting their recruitment. Therefore, the objective of this study was to evaluate the effects of acclimation to flow and site-specific physicochemical water conditions on poststocking dispersal and physiological condition of age-1 pallid sturgeon. Fish from three acclimation treatments were ra...; Download File | View full details

Multicellular mathematical models of somitogenesis: Author: Campanelli, Mark Benjamin; Date: 2009-08-15; Program: Mathematics; Abstract: Somitogenesis is an important pattern formation process in the developmental biology of vertebrates. The phenomenon has received wide attention from experimental, theoretical, and computational biologists. Numerous mathematical models of the process have been proposed, with the clock and wavefront mechanism rising to prominence over the last ten years. This work presents two multicellular mathematical models of somitogenesis. The first is a phenomenological phase oscillator model that reproduces both the clock and wavefront aspects of somitogenesis, but lacks a biological basis. The second is ...; Download File | View full details

System for Wireless, Automated and Continuous Monitoring of Resonant Frequency of an Inductor - Capacitor Circuit: Author: Sajeeda; Date: 2004-05-15; Program: Electrical Engineering; Abstract: This thesis presents a new technique for remote query monitoring of environmental parameters such as pressure, temperature, humidity, complex permittivity, temperature, strain and gases like carbon dioxide, oxygen and ammonia. Resonant peak passive telemetry is used for wireless remote monitoring. The resonance frequency of an inductor-capacitor (LC) circuit sensor changes with the surrounding environmental parameter and detector circuitry employing a loop antenna is used to remotely identify the resonance frequency. The mutual coupling between the antenna and the sensor inductor enables wirel...; Download File | View full details

Analysis and Design of the Mechanical Systems Onboard a Microsatellite in Low-Earth Orbit: An Assessment Study: Author: Solomon, Dylan Raymond; Date: 2006-05-15; Program: Mechanical Engineering; Abstract: A study of the mechanical systems contributing to the design and performance of a picosatellite's mission in low-Earth orbit (LEO) was performed through design and analysis. The unique architecture of this satellite stems from a form factor established by the internationally recognized CubeSat Program. This CubeSat-Plus architecture limits the satellite's size to be no larger than a 10 x 10 x 15 cm cube with an overall mass not exceeding 2 kg. This satellite would then be launch into LEO and conduct on-orbit GPS measurements while remaining tethered to the second stage booster of a Boeing Delt...; Download File | View full details

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