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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California / This paper describes a ferrite antenna that can produce any polarization on the Poincaré sphere over the frequency range of 9.0 to 11.4 GHz by utilizing Faraday rotation and a quarter-wavelength phase shifter. All possible polarizations of the electromagnetic wave are achievable with this antenna which includes linear, circular and elliptical polarizations. Any tilt angle of elliptical polarization and any orientation of the linear polarization can be achieved as well. The polarization of the ferrite antenna can be electronically switched to a different polarization instantly without the use of moving parts. An automatic data acquisition system was designed and built to fully analyze the antenna' s characteristics.

The shape of a liquid's surface is determined by both the body force and surface force of the liquid. In this report, the body force is solely from the gravitational force. The surface force is generated from the movement of an elastic interface between the solid and liquid. To obtain the shape of the surface, both asymptotic analysis and numerical approaches are used in this report. The asymptotic analysis is applied on the potential flow. The initial conditions are chosen to be the function of the shape of the interface between the solid and liquid and the free stream velocity far away from the interface. The time dependent contributions from the fluid system are also considered. The initial condition changes according to the function of the calculated velocity potential. The numerical approach includes two parts: calculation the velocity potential and a formalism of the change of the system as time evolves. For the first part, two idealized vertical boundaries are utilized to give a unique solution of the Laplace equation. The boundary conditions are determined as the flow under linear viscosity. For the second part, the flow is first assumed to be a potential flow, and a boundary layer is considered to make the no-slip condition valid and to give a more precise approximation for the shear stress.

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Thesis (M.S.)--University of Wisconsin--Madison, 1968. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

The magneto-optical Faraday effect was used, to observe the spin-bath relaxation in Europium doped CaF₂ crystals at helium temperatures from 1.5 to 4.2° K. Theory shows that the magnitude of the Faraday rotation is proportional to the difference in population of the ground state doublet. The experimental method used in this thesis is the same as that which was successfully used by Glattli and by Griffiths. Pulsed microwave power at X-band frequencies was employed to disturb the equilibrium between the spin system and the bath. The observed relaxation time t was expected to have a T⁻¹ temperature dependence hut because of the orientation of the crystal in our dc magnetic field which resulted in the seven transition lines being close together, cross-relaxation effects produced a temperature dependence of approximately T⁻². It is suggested that exchange coupled pairs of Eu²⁺ and clusters involving Eu³⁺ may account for this temperature dependence rather than there being a phonon bottleneck present. The field dependence of the relaxation time was found not to be directly related to the resonance spectrum, The Eu²⁺ concentration of the crystals used in this thesis was .2% / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Orientador: Antonio G. J. Balbin Villaverde / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin / Made available in DSpace on 2018-07-13T22:17:18Z (GMT). No. of bitstreams: 1 Munin_Egberto_M.pdf: 1491500 bytes, checksum: e879f0af597dfe5802d6eb9a3d07c493 (MD5) Previous issue date: 1990 / Resumo: Foi construída uma fonte de campos magnéticos intensos pulsados com capacidade para gerar campos acima de 100 kGauss com resolução de 1%, a qual foi utilizada para medir a dispersão da rotação de Faraday de 8 cristais isomorfos ao KDP - (RDA, KDA, CDA, ADA, DRDA, DCDA, KDP, RDP), e também de uma amostra de Dynasil 1001 (sílica amorfa). As medidas foram feitas na região visível do espectro, nas linhas dos laseres de He-Ne e Argônio. Com os valores medidos, calculamos a anomalia magneto-óptica g dos cristais, constante esta que pode ser correlacionada com o caráter das ligações eletrônicas. Aplicamos também aos dados experimentais, dois modelos teóricos através dos quais calculamos os gaps de energia dos cristais. Estudamos a influência da troca de ânions e/ou cátions e da substituição do hidrogênio por deutério nas propriedades destes materiais abordadas neste trabalho / Abstract: not informed. / Mestrado / Física / Mestre em Física

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