9,624 research outputs found
SC author and illustrator Kate Salley Palmer signing book
No full textPhotograph of SC author and illustrator Kate Salley Palmer signing boo
Book signing by SC author and illustrator Kate Salley Palmer
No full textPhotograph of Book signing by SC author and illustrator Kate Salley Palme
Análise da suscetibilidade a deslizamentos por critérios topográficos : um estudo no alto da Bacia do Ribeirão Belchior, Gaspar - SC
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Civil, Florianópolis, 2013Em novembro de 2008 Santa Catarina foi palco de mais uma catástrofe, um evento pluvial intenso desencadeou inundações e movimentos de massa, atingindo diversos municípios. A mesorregião do Vale do Itajaí foi a mais atingida. As geotecnologias vêm se desenvolvendo e ampliando suas áreas de atuação e a mais de vinte anos modelos matemáticos têm sido desenvolvidos e aplicados em mapeamentos de deslizamentos (CHI et al. 2002). Este estudo aplicou o modelo probabilístico proposto por Chung e Fabbri (1999) para mapeamento de suscetibilidade a movimentos de massa. Com a utilização de um SIG para o processamento de informação cartográfica indireta em um modelo matemático, analisaram-se quais variáveis tem maior ou menor probabilidade de promover a suscetibilidade a deslizamentos na área em estudo e foi elaborado o mapa de suscetibilidade a deslizamentos translacionais do alto da bacia do Ribeirão Belchior. Realizou-se também um inventário de deslizamentos translacionais do alto da bacia do Ribeirão Belchior, complementando o inventário realizado por Bauzys (2010). O modelo aplicado revelou um grande potencial para a análise da suscetibilidade a deslizamentos, porém, não obteve com as variáveis utilizadas um ótimo resultado. De acordo com a taxa de predição com 10% e 30% da área de maior suscetibilidade foram preditos aproximadamente 20% e 40% dos deslizamentos, respectivamente Abstract: In November 2008, Santa Catarina was affected by another catastrophe, a heavy rain event triggered floods and mass movements, affecting several municipalities. The Vale do Itajaí region was the worst hit. Geotechnology has been developing and expanding it?s areas of applicability. In the past twenty years mathematical models have been developed and applied in landslide mapping (CHI et al. 2002). This study applied a probability model proposed by Chung and Fabbri (1999) for landslide susceptibility mapping. Using GIS for processing indirect cartographic information in a mathematical model, variables were analyzed to see which had more or less likelihood to promote landslide susceptibility in the study area and the Translational Slides Susceptibility Map by Alto da Bacia do Ribeirão Belchior was drafted. An inventory of translational landslides by Alto da Bacia do Ribeirão Belchior was also done, complementing the inventory performed by Bauzys (2010). The model applied revealed a great potential for the landslides susceptibility analysis, however, it not achieved a great result with the variables used. According to the prediction rate of 10% and 30% of the increased susceptibility area were predicted approximately 20% and 40% of the landslides, respectively
Investigation of the causes of negative damping of synchronous machines
No full textThesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1947.Vita.Includes bibliographical references (leaf 156).by Chung, Shih-Mu.Sc.D
ELECTRICAL-PROPERTIES OF CDTE-FILMS PREPARED BY CLOSE-SPACED SUBLIMATION WITH SCREEN-PRINTED SOURCE LAYERS
No full textCdTe films have been deposited by a close-spaced sublimation process with screen-printed CdTe layers as a new source. The source-layers were fabricated by screen printing and sintering slurries consisting of propylene glycol, CdCl2 and either CdTe powder or (Cd+Te) powder. When CdTe powder was used as a starting material for the source-layer, the electrical resistivity of the CdTe film deposited in O-2 was about one-tenth lower than that of the film deposited in He. AES, EDS and PIXE analysis showed that the Cd content in the CdTe films deposited in O-2 was Smaller than that in the CdTe films deposited in He. Especially, no oxygen element was detected in the CdTe films deposited in O-2. It turned out that the Sublimated Cd(g) and CdTe(g) from the source-layer formed cadmium oxides in O-2 and as a result the overall composition of vapor source became more Cd-deficient. The CdTe film with less Cd content increased cadmium vacancy defects (V2-Cl+ and ed V-Cd(2-)) and hole concentrations. As the Cd/Te ratio in the starting (Cd+Te) powder decreased, the ed resistivity of the CdTe films decreased and reached at a constant value of about 3x10(4) Omega . cm, regardless of deposition atmosphere. In addition, the resistivity decrease by O-2 treatment was diminished when the Cd/Te ratio was below 0.7, where the composition of CdTe film might be limited by solid solubility (Cd0.92Te1.0) The above results indicated that the resistivity decrease of CdTe films deposited in O-2 was not due to the effect of previously-known oxygen doping but due to the effect of Cd/Te compositional change. (C) 1995 American Institute of Physics
An optimum control strategy of channel input-traffic in FH/SSMA systems with central controllers
No full textBn optimum channel input-traffic control (OCIC) scheme is proposed and investigated for slotted frequency-hopped spread spectrum multiple access communication systems. The conditional throughput is obtained, the state transition probability is derived, the steady-state throughput is obtained, and the mean packet delay is calculated. It is shown that the performance of the OCIC scheme is better than that of other schemes. It is also shown that the smaller the number of frequency slots is, the more the OCIC scheme outperforms the other schemes. (C) 1998 Elsevier Science B.V. All rights reserved
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