Thesis (M.S.)--University of Michigan, 1983.

No description available.

International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California / The design of a telemetry tracking system is generally centered around its desired RF performance which is typically specified in terms of beamwidth, gain and/or G/T. These parameters determine the size of the reflector used in a given application and consequently dictate the required size and performance of the associated pedestal. Any subsequent improvement in the RF performance of such a system is primarily achieved by increasing the size of its reflector. The magnitude of the improvement realized is therefore limited by the load handling capability of the pedestal. In most instances, the substitution of a larger reflector with its increased inertia and wind loading causes a significant degradation in the dynamic performance of the tracking system. This paper describes how the figure of merit (G/T) of a specific dual axis telemetry tracking system can be improved by a minimum of 7.3 dB/K° without impacting its dynamic performance or increasing its weight. These impressive results are made feasible by the innovative pairing of a unique design planar reflector with a novel implementation of the conical scanner technology. The FLAPS™ reflector incorporates a newly developed concept which features lightweight construction and very low wind load coefficients [1, 2]. The conical scanner is a lightweight version of the DECS tracking feed system described in the referenced technical paper [3].

International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada / The use of low windload FLAPS™ antennas in telemetry tracking systems yields sizable savings in system cost due to the reduced requirements imposed on the pedestal assembly and on the underlying support structure. Traditionally the use of these antennas has been limited to applications in which frequency bandwidths did not exceed 10-13%. This paper describes a variation of the FLAPS™ technology which allows operation over bandwidths in excess of 35% and makes it usable in broadband systems. Two new applications are feasible: one for a ground based telemetry system operating in the 1435-1850 or 1750-2400 MHz band and one for a shipboard satellite communication system operating in the 4000-6000 MHz band.

International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada / The requirement for a lightweight, quick deployment C-Band satellite communication antenna system for Aegis Class Destroyers has been addressed and this paper describes a novel solution currently being implemented. The new antenna system takes advantage of the low windload properties of the FLAPS™ (Flat Parabolic Surface) reflector and features a broadband FLAPS™ reflector mounted on a lightweight, high performance X-Y positioner. The system is designed in a modular fashion and operates in a shipboard environment without the protection of a radome. The system is stabilized to counteract the ship's motion, operates without counterweights, weighs less than 250 kg and provide communication links in the 3900 to 4100 MHz and 6000 to 6200 MHz frequency bands.

INTRODUÇÃO: A propriedade de induzir angiogênese torna o omento um promissor pedículo para pré-fabricar retalhos. OBJETIVO: Estabelecer a área abdominal a ser pré-fabricada por um pedículo omental e analisar o potencial de pré-fabricação (PPF) conforme o tempo de espera entre a introdução do pedículo e a elevação do retalho. MÉTODOS: Foram utilizados 44 coelhos divididos em quatro grupos (A, B, C e D). No grupo A, um fragmento de pele, tecido subcutâneo e músculo cutâneo abdominal foi totalmente separado e ressuturado. Nos demais grupos, um pedículo omental, contendo os vasos gastromentais ligados distalmente, com área equivalente a 9 cm² foi transposto e suturado ao músculo cutâneo abdominal. Um segundo procedimento de incisão e elevação de um retalho contendo pele, subcutâneo e músculo cutâneo abdominal pediculado apenas pelo omento transposto, foi realizado, variando apenas o período de espera entre os dois procedimentos de 7, 21 e 56 dias para os grupos B, C e D respectivamente. Após 15 dias do último procedimento, os retalhos foram visualizados e as áreas viáveis foram calculadas através do programa de computador Image Tool®. Cortes de áreas viáveis foram imunocoradas pelo anti-CD31 para cálculo da densidade microvascular (DMV). RESULTADOS: Os valores médio e máximo das áreas viáveis no grupo D foram respectivamente 45,29 cm² e 99,37 cm² (PPF mediano = 5,03 e PPF máximo = 11,04). Não houve diferença significativa entre as áreas viáveis do grupo D e C. As médias da DMV dos grupos B, C e D foram respectivamente 24,54 vasos/mm², 33,20 vasos/mm² e 27,03 vasos/mm² e maiores do que as médias da DMV das áreas controles de 14,63 vasos/mm², 17,33 vasos/mm² e 18,12 vasos/mm². No grupo A, houve necrose total em todos os retalhos. CONCLUSÃO: O PPF mediano do pedículo omental foi de 5,03 vezes sua área e o tempo de espera para o segundo procedimento foi de, no mínimo, 21dias / INTRODUCTION: The angiogenic induction property of the omentum makes it a promising pedicle to prefabricate flaps. OBJECTIVE: To establish the abdominal area to be prefabricated by the omental pedicle and to analyze the prefabricate potential according to the time delay between the pedicle introduction and the flap release. METHODS: 44 rabbits were divided into four groups (A, B, C and D). In group A, a piece of skin, subcutaneous tissue and abdominal cutaneous muscle has been fully released and sutured again in its place. In other groups, a 9 cm2 omental pedicle containing the gastromental vessels distally tied has been transposed and sutured to abdominal cutaneous muscle. A second procedure, an incision and release of the flap that contained skin, subcutaneous and cutaneous abdominal muscle pediculated only by the omentum, has been carried out. The only variation was the time delay between the two procedures: 7, 21and 56 days for groups B, C and D, respectively. The flaps have been inspected 15 days after the last procedure, and the viable areas have been estimated using the software Image Tool®. The pieces of viable area have been immunostained using anti-CD31 allowing the estimation of the microvascular density. RESULTS: The mean and maximum viable areas in group D were 45.29 cm2 and 99.37 cm2 respectively (average prefabricate potential = 5.03 and maximum prefabricate potential = 11.04). There was no significant difference between the viable areas in groups C and D. The mean microvascular densities of groups B, C and D were 24.54 vessels/mm2, 33.20 vessels/mm2 and 27.03 vessels/mm2 respectively. This was higher than the mean microvascular densities of the control areas, which were 14.63 vessels/mm2, 17.33 vessels/mm2 and 18.12 vessels/mm2. In group A, there were total necrosis in all flaps. CONCLUSION: The prefabricate potential of the omentum was found to be 5.03 times its area and the delay time for the second procedure was, at least, 21 days

An experimental investigation was undertaken to test the effectiveness of a novel design for controlling the aerodynamics of an airfoil. A synthetic jet actuator (SJA) was placed inside a NACA 0015 airfoil with its jet at 12.5% of the chord length, hereby referred to as the leading edge actuator. Four centrifugal fans across the span were mounted at 70% of the chord and the jet formed by them was located at 99% of the chord, hereby referred to as the trailing edge actuator. The effects of these actuators on the aerodynamic properties were studied, separately and then in conjunction, with varying angles of attack. The leading edge actuator delays the onset of stall up to 24 degrees, the maximum angle of attack that could be attained. The control of the aerodynamics was achieved by controlling the amount of separated region. There was no effect of the actuation at lower angles of attack. The trailing edge actuator provides aerodynamic control at both low and high angles of attack. The study investigated the effect of jet momentum coefficient on the aerodynamic properties for various angles of attack. The data obtained shows that lift control (in both positive and negative direction) was achieved even at low angles. The actuator enhances the aerodynamic properties by changing the pressure distribution as well as by delaying flow separation. Study of the combined actuation shows that the synthetic jet actuator was very effective in delaying stall when the trailing edge jet was ejected from the upper surface. For the case when the jet is ejected from the lower surface, there is less control. This can be accounted for by the difference in aerodynamic loading for both cases.

Thesis (Ph.D)--Aerospace Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Hodges, Dewey; Committee Member: Bauchau, Olivier; Committee Member: Goldsman, David; Committee Member: Prasad, J.V.R.; Committee Member: Smith, Marilyn. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Diss. (sammanfattning) Stockholm : Karolinska institutet, 2006. / Härtill 4 uppsatser.

Thesis (M.S.)--University of Michigan, 1985.