Hoy en dia las aplicaciones de sistemas de comunicacion satelitales demandan un mayor ancho de banda, mayor integracion de componentes y una mayor potencia de entrada. Estos tres requerimientos implican mayores densidades de campo electrico dentro de los dispositivos. Por eso es indispensable analizar su impacto en la operacion normal de un satelite por medio de modelos teoricos y su interpretacion en programas computacionales. Existen muchos fenomenos que limitan la capacidad de un subsistema dentro de un satelite de aumentar su potencia. En particular, los mas relevantes son, en componentes...

How lives can be changed. There are 46.2 million people living in poverty. With all the assistance our government offers, food stamps, welfare, Social Security, Medicare, Medicaid, free school lunch, free education and so much more. We still have 46.2 million people living in poverty - How can we change this? Annette Ramirez works at a church-run community center in San Bernardino, Calif. Being poor is new for Annette Ramirez. "When I first walked out of that welfare office, I came out in tears," she says. The 44-year-old graphic designer from San Bernardino, Calif., used to lay out...