Thesis (Ph.D.)--City University of Hong Kong, 2009. / "Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves 105-111)

Master-Arbeit Univ. St. Gallen, 2007.

Master-Arbeit Univ. St. Gallen, 2006.

Master-Arbeit Univ. St. Gallen, 2007.

Thesis (M.S.) -- Worcester Polytechnic Institute. / Keywords: Fire spread; FDS. Includes bibliographical references (leaves 38-41).

Thesis (M.E.F.E.)--University of Canterbury, 2006. / Typescript (photocopy). "March 2006." Includes bibliographical references (leaves 197-204). Also available via the World Wide Web.

Made available in DSpace on 2014-06-12T17:21:50Z (GMT). No. of bitstreams: 2 arquivo6121_1.pdf: 752793 bytes, checksum: 5203a1390ccb3548a1e2e007b735250f (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2006 / A dissertação trabalha com a hipótese de que diferentes linhas de crédito têm impactos diferentes no spread. Através de um modelo econométrico, que usa dados de painel, obtém-se justamente a relação que trata o spread em função de variáveis do tipo: prazo, volume de financiamento concedido, juros da linha de crédito e volume em atraso. Os resultados servem para explorar e entender melhor o comportamento do spread nas atividades bancárias do Brasil

Made available in DSpace on 2014-06-12T15:02:39Z (GMT). No. of bitstreams: 2 arquivo1012_1.pdf: 698421 bytes, checksum: df3325ba14c89dbdd81ce50863d2a23a (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2009 / Banco do Brasil S.A / Os altos spreads bancários verificados no Brasil têm influência direta sobre aspectos como a disponibilização de crédito e o crescimento da economia. Assim, este trabalho procura analisar os vários pontos que tangenciam esse assunto, principalmente reconhecendo os determinantes responsáveis pela sua magnitude. Constata-se que o spread bancário apresenta uma estrutura bastante oscilante, variando de acordo com o tipo de crédito e com o tipo de tomador. Paralelamente, a dissertação dedica-se à investigação da concentração do setor através do índice de Herfindahl, sendo verificado que a indústria bancária no Brasil, em uma comparação internacional, é um mercado desconcentrado. Por fim foram analisados quais determinantes são responsáveis pela magnitude do spread. Os resultados gerais mostram que os determinantes do spread analisados pelo presente trabalho apresentaram uma alta associação com o spread, denunciando que o modelo foi bem especificado. Numa análise geral (pessoa física e pessoa jurídica) destacaram-se a taxa SELIC e a inadimplência do setor. Numa análise por tipo de tomador, foi verificado que o spread pessoa física é determinado principalmente pela inadimplência, receita com tarifas e a tributação. Quanto ao spread pessoa jurídica destacaram-se a receita com tarifas, a tributação e as despesas administrativas

"NIST's Fire Dynamics Simulator (FDS) is a powerful tool for simulating the gas phase fire environment of scenarios involving realistic geometries. If the fire engineer is interested in simulating fire spread processes, FDS provides possible tools involving simulation of the decomposition of the condensed phase: gas burners and simplified pyrolysis models. Continuing to develop understanding of the capability and proper use of FDS related to fire spread will provide the practicing fire engineer with valuable information. In this work three simulations are conducted to evaluate FDS V.4's capabilities for predicting upward flame spread. The FDS predictions are compared with empirical correlations and experimental data for upward flame spread on a 5 m PMMA panel. A simplified flame spread model is also applied to assess the FDS simulation results. Capabilities and limitations of FDS V.4 for upward flame spread predictions are addressed, and recommendations for improvements of FDS and practical use of FDS for fire spread are presented."

With the increasing system clock, a clock circuit will cause an amount of electromagnetic interference. To reduce EMI of the products, various EMI strategies have been developed. In the thesis, we study the suppression of electromagnetic interference of a clock circuit by using the spread spectrum technique. The basic idea of the spread spectrum is to slightly modulate the frequency of the clock signal and the energy of the signal will be dispersed to a controllable range to reduce the peak energy of each harmonic wave in the spectrum, and the products can pass the electromagnetic compatibility test more easily. We obtain the attenuation factor of spread spectrum from the theoretical derivation, including modulation index and modulation profiles. From the numerical simulation, we verify that spread spectrum technique can suppress the peak energy. We propose the attenuation formulas which can control the attenuation of every frequency point. To verify our findings, we use a spread spectrum clock generator from market to perform measurement. The trapezoidal waveform can be used to represent a clock circuit. Its waveform includes rise time and duty cycle. We will discuss the influence of rise time and duty cycle on the spread spectrum technique. Shorter rise time will cause high order harmonics in the high speed clock circuit. We verify that spread spectrum technique can suppress high order harmonics from both the simulation and experiment. Because every harmonic can be suppressed, the spread spectrum technique has the good suppression effect for the whole system.