1. Sensitivity of hydrological connectivity in a semiarid basin with a high-density reservoir network

Resumo Os reservatórios de água, em geral, têm sido considerados a principal causa de redução da conectividade hidrológica a jusante nos canais. Portanto, este estudo tem como objetivo analisar a sensibilidade da conectividade hidrológica na bacia hidrográfica do reservatório de Orós, utilizando o modelo ResNet, desenvolvido para simular os process

Rev. Ambient. Água. Publicado em: 22/07/2019

2. EspaÃos fuzzy e aspectos quÃnticos dos buracos negros. / And fuzzy spaces quantum aspects of black holes

Propomos um modelo baseado na mudanÃa de topologia de uma variedade quÃntica no sentido de justificar a origem da termodinÃmica dos buracos negros. Alguns pontos importantes sÃo discutidos, por exemplo, o porquà de os buracos negros obedecerem a uma segunda lei generalizada da termodinÃmica. Para isso, nÃs estudamos as regras de seleÃÃo que governam

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/09/2011

3. Otimização topológica de transdutores piezelétricos com gadação funcional de material: projeto, simulação, análise e fabricação. / Topology optimization of piezoelectric transducers considering functionally graded material: design, simulation, analysis and fabrication.

Piezoelectric materials generate displacements when they are excited by electrical potential and electrical potential when they are excited by force or pressure. These materials are widely applied in Precision Mechanics, Mechatronics, and Ultrasonic imaging areas. On the other hand, Functionally Graded Materials (FGM) are advanced materials, whose properties

Publicado em: 2010

4. Uma avaliação dos mecanismos de trasmissão de tráfego para IPTV

The IPTV service offer is currently the main interest of many ISPs (Internet Service Providers). Such service comprises the continuous transmission, via an IP network, of TV programs structured into channels, like the open TV ou cable TV services. The goal is to reach the same quality of conventional TV (full screen, medium or high definition), adding the in

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/06/2009

5. Graphene to graphite: electronic changes within DFT calculations

Calculations based on the first-principles pseudopotential plane-wave method and density-functional theory are performed to investigate the electronic properties of graphene, bilayer graphene, multilayer graphene, and graphite. From an analysis of the electronic band structure close to the Fermi level, we have quantified the gradual change in the Fermi surfa

Brazilian Journal of Physics. Publicado em: 2009-12

6. Escalabilidade de fonte de alimentação chaveada para uso em eletrodomesticos / Switch mode power supply scalability fo use in home appliances

This work describes the development of a switch mode power supply to be used at home appliances, capable to deliver three outputs with voltage and power different levels, changing a minimum number of components between them. At the first part of the work is presented the application of the power supply and its needs, followed by the specifications and choose

Publicado em: 2009

7. COMPARATIVE ANALYSIS BETWEEN THE MAXIMIZATION OF VOLTAGE STABILITY MARGIN AND LOSS REDUCTION IN DISTRIBUTION SYSTEMS / ANÁLISE COMPARATIVA ENTRE A MAXIMIZAÇÃO DA MARGEM DE POTÊNCIA E MINIMIZAÇÃO DAS PERDAS TÉCNICAS EM SISTEMAS DE DISTRIBUIÇÃO DE ENERGIA ELÉTRICA

The increase of the consumption of electric energy takes the distribution systems to operate next to its limits, which might cause situation of maximum active and reactive power flow in the branches, that is, problems of voltage stability. The change of the topology of the network allows to find a configuration where de voltage stability indexes are far from

Publicado em: 2007

8. Dynamics and control of heat exchanger networks / Dinamica e controle de redes de trocadores de calor

Energy integration among chemical process streams can lead to quite complex heat exchanger networks (HEN) with difficulties in terms of controI. In this work HEN dynamics and steady state aspects were addressed with the aim of proposing a control strategy that minimizes utility consumption and satisfies imposed specifications. A steady state model of the HEN

Publicado em: 2007

9. Um middleware reconfigurÃvel para redes de sensores sem fio

The WSN attractivity for environment conditions monitoring and to be the bridge between the physical and virtual world has been increasing due to the advances in the micro-electronics, which enabled the production of several sensor types like illumination, humidity, temperature, smoke, radiation, acoustic, seismic, etc. in a chip that processes the signal an

Publicado em: 2006

10. Suscetibilidades de carga e spin para uma superfície de fermi chata bidimensional

In this work we investigate the charge and spin instabilities of a two-dimensional model (d=2) of strongly interacting electrons in the presence of a at Fermi surface (FS) by using the renormalization group theory (RG). Bearing in mind the strong electronic repulsions in the cuprates superconductors, we try to relate our model to the repulsive Hubbard model

Publicado em: 2006

11. O Teorema do h-cobordismo e a conjectura generalizada de PoincarÃ

The work of the following way In the first chapter it is developed to a list definitions and theorems that we found but important on subjects such as Topology, Differential Manifolds and aspects of the Algebraic Topology, which will be used in the following chapters. We considered advisable to indicate the demonstrations of the theorems, thus, like commentar

Publicado em: 2005

12. Estudo de potência reativa, tensão, contingência e perdas em empresas de energia elétrica localizadas na Grande São Paulo

In the middle of the 20 20th th century the Brazilian electrical energy sector experienced a rapid growth, since that occasion the problem of voltage control in the transmission and distribution systems grabbed the attention of energy authorities, electrical sector offices and high voltage consumers. With the limitation of reactive power in transmission line

Publicado em: 2005