Análisis del mercado eléctrico regional de Centroamérica y acciones para impulsar proyectos de generación nacional

Incluye Bibliografía

Evolución y perspectivas del subsector eléctrico del Istmo Centroamericano: versión preliminar

Realiza un balance de los energéticos comerciales, como son el petróleo y la electricidad y su influencia en el panorama económico en la región del Istmo Centroamericano, así como las características de los sistemas eléctricos para su transferencia entre los países de la región, y las perspectivas de demanda y oferta de 1989 al año 2000.

Regulación e inversiones en el sector eléctrico argentino

Incluye Bibliografía

Recursos naturales: situación y tendencias para una agenda de desarrollo regional en América Latina y el Caribe. Contribución de la Comisión Económica para América Latina y el Caribe a la Comunidad de Estados Latinoamericanos y Caribeños

Incluye bibliografía.

Revista de la CEPAL no.88

Vigencia de los aportes de Celso Furtado al estructuralismo / Ricardo Bielschowsky. -- Obsolescencia de la protección a los inversores extranjeros después de la crisis argentina / Michael Mortimore y Leonardo Stanley. -- Una aproximación al enfoque de derechos en las estrategias y políticas de desarrollo / Víctor Abramovich. -- ¿Pueden los países de América Latina y el Caribe emular el modelo irlandés para atraer inversión extranjera directa? / Ruth Ríos-Morales y David O ’Donovan. -- El lento retorno de las políticas industriales en América Latina y el Caribe / Wilson Peres. -- Un modelo de bajo crecimiento: la informalidad como restricción structural / Mario Cimoli, Annalisa Primi y Maurizio Pugno. -- El mercado de trabajo argentino en la globalización financier / Mario Damill y Roberto Frenkel. -- Precariedad social en México y Argentina: tendencias, expresiones y trayectorias nacionales / María Cristina Bayón. -- Pacto Fiscal en Guatemala: lecciones de una negociación / Juan Alberto Fuentes K. y Maynor Cabrera. -- Cambio de la estructura productiva en Chile, 1986-1996: producción e interdependencia industrial / José Miguel Albala-Bertrand. -- Orientaciones para los colaboradores de la Revista de la CEPAL. -- La Revista de la CEPAL en Internet. -- Publicaciones recientes de la CEPAL.

Integración regional - la importancia de una geometría variable y de pasos paralelos

Las economías de América Latina han presentado recientemente diversos avances, reflejados en niveles bajos de inflación, dinamismo exportador, mayor atracción de inversores externos, aumento del gasto social, creciente preocupación con la sostenibilidad ambiental del desarrollo, mejora en el perfil de las cuentas públicas, con mejores resultados fiscales y menores deudas, entre otros aspectos. En los últimos años – y en particular en los meses de la última crisis - se ha verificado un menor interés en el tema de la integración regional. Hay beneficios en los procesos de convergencia entre los países de la Región, pero ellos son necesariamente diferenciados, según el conjunto de países considerados. Más importante, y posiblemente más urgente – incluso porque los tiempos de respuesta en el ámbito financiero son menores que en el lado real de la economía – es el reconocimiento de la necesidad de iniciativas conjuntas en términos financieros. No solo el momento parece oportuno para iniciativas en ese sentido, sino que además su éxito puede contribuir muy fuertemente para facilitar la propia integración comercial/productiva.

Valoración y gobernanza de los proyectos geotérmicos en América del Sur: una propuesta metodológica

El presente documento contiene un análisis de la situación del sector geotérmico en América delSur, enfocado en la generación geotermo-eléctrica, con identificación de los principales proyectos y con evaluación de todos los factores que los caracterizan, desde el punto de vista histórico, del recurso, de su accesibilidad, y de las condiciones de entorno institucional, social, ambiental y de mercado.

Controle da injeção de potências ativa e reativa em inversor de Geração Distribuída conectado à rede de distribuição em corrente alternada em baixa tensão, empregando LMIs com realimentação de estados e critérios de D-estabilidade

Pós-graduação em Engenharia Elétrica - FEIS

Reatores eletrônicos para sistemas de iluminação com múltiplas lâmpadas tubulares fluorescentes com controle de luminosidade, elevada eficiência e elevado fator de potência

Pós-graduação em Engenharia Elétrica - FEIS

Aplicação de inversor de freqüência para economia de energia elétrica, em sistema de irrigação por aspersão

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Órtese de tornozelo: efeito sobre a razão de pico torque muscular eversor excêntrico/inversor concêntrico do tornozelo durante simulação do basquetebol

The ankle sprains represent the most common injuries in sports and basketball. In this sense, the use of ankle bracing and strength capacity analysis of the ankle evertor and invertor muscles, have been suggested as preventive measures and important tools for identifying risk factors associated with ankle sprains. However, questions still persist as to effect of the use ankle bracing on biomechanical variables related to the stability of the ankle. For this reason, this study aims to analyze the effect of the use of ankle bracing on peak torque (PT) of ankle evertor and invertor muscles and on eccentric evertor/concentric invertor torque ratio (EVEECC/INVCON), during the basketball match-play simulation. Ten healthy college basketball players, without mechanics or functional ankle instability performed a laboratory-based protocol representative of work rates observed during basketball match-play, in two different situations, with and without use of ankle bracing. The test was composed of a succession of intermittent physical effort equally distributed in four periods of 10 minutes each, considering the mechanical and physiological demands of a basketball match-play. Prior to the start of the trial (Evaluation 1) and after 2° (Evaluation 2) and 4° (Evaluation 3) periods, the subjects performed five maximal isokinetic concentric and eccentric contractions of ankle invertor and evertor muscles, separated by two minutes rest, at 60 °/s and 120 °/s. After testing for normality of data distribution with the Shapiro-Wilk test, was used the ANOVA repeated measures for two factors and post-hoc Bonferroni test for comparison of variables between assessments. Was adopted p < 0.05. There was no significant difference for PT and EVEECC/INVCON torque ratio between assessments. There was a decrease in PT EVEECC at 60º/s and 120º/s for the ...(Complete abstract click electronic access below)

Desenvolvimento de experiências de acionamento e controle do movimento angular de motores de indução trifásico

This paper aims to show practical and effectiveexperiencesfor lessons Industrial Automation Laboratory taught inundergraduate degreein ElectricalEngineering from the University Júlio MesquitaFilho - UNESP, Guaratinguetá. Experiments carriedsimulatecontrol and drive systems of electric three phase induction motors (MIT)widely usedinindustries. The experiments simulate a manufacturing environment where there isa need to control the activation and continuous operation ofelectricmotors. Seven experimentsthat simulatethe firing of electrical motors through a controlsystem, a driver along with asimulator loads coupled to the electric motor was developed. Experiments usinga Programmable Logic Controller (PLC) as acontroller,an inverter frequencyasdriver, and MagneticBrake, as simulatorengine loads . The experiments were divided accordingto the speed reference signal used fordrivingand operating the electric motor: digital and analog. The first five experiments performing the drive control and operation of the electric motor via digital signals. The sixth and seventh experiments using an analog signal as a reference speed for the electric motor

Controle de velocidade de um motor de indução trifásico usando técnicas de ajuste empírico para bancada de teste no laboratório de automação

This work aims to make the closed loop control of a three phase induction motor, through the integration of the following equipment: a frequency inverter, the actuator system; a programmable logic controller (PLC), the controller; an encoder, the velocity sensor, used as a feedback monitoring the control variable and the three-phase induction motor, the plant to be controlled. The control is performed using a Proportional - Integrative - Derivative (PID) approach. The PLC has a help instruction, which performs the auto adjustment of the controller, that instruction is used and confronted with other adjustment methods. There are several types of methods adjustments to the PID controllers, where the empirical methods are addressed in this work. The system is deployed at the Interface and Electro Electronic Control laboratory in the Universidade Estadual Paulista Júlio Mesquita Filho, Guaratinguetá, São Paulo, then, in the future, this work becomes an experiment to be conducted in the classroom, allowing undergraduate students to develop a greater affinity to the programs used by the PLC as well as studies of undergraduate and graduate works with the help of assembly made

Chaveamento de cargas intermitentes usando sensor de corrente

Due to concerns about rational use of energy, several alternative technologies of power generation appeared, including the conversion of solar energy into electrical energy by photovoltaic panels. In low-income households, the refrigerator represents considerable impact on the electric bill, since it requires constant power given its use in food preservation. It is possible to reduce this share, with the use of an alternative energy source. This work presents a timed switching electronic system, which allows commercial equipment that is not affected by short interruptions in the power supply to use a photovoltaic panel as a source of alternative energy, which usually do not provide energy continuously. Switching is made automatically in case of low incidence of sunlight, and without any form of energy storage. Between each switching, there is a dead time without power supply, therefore preventing the use of synchronizers circuits between the photovoltaic panel and the public power grid. A circuit containing a 80C31 microcontroller is used to control the system’s switching. The photovoltaic panel’s voltage inverter is in H bridge configuration, and is also controlled by the microcontroller through Pulse Width Modulation, which makes use of preprogrammed tables to generate the control signals of the power transistors. Through the use of software simulations, the proposed system was tested, which is capable of supplying intermittent single-phase loads. The simulations indicates that the project developed in this paper can be assembled into a prototype and be tested under real operating conditions, as long as the scaling of components, the characteristics of the photovoltaic panel to be used, and the project involved load are taken into account

Estratégia de controle multifuncional para sistemas fotovoltaicos de geração de energia elétrica

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)