Recibido el 10 de junio de 2005, aceptado el 20 de octubre de 2005
RESUMENUn modelo formado por bioplasma quiral con un conjunto de macromoléculas de ADN, que representa la estructura interna de la cabeza humana, hace posible analizar su comportamiento, cuando es irradiada por campos electromagnéticos de microondas de teléfonos celulares o sistemas WLAN a frecuencias de 2.4 y 5.2 GHz. El método de diferencias finitas en el dominio del tiempo, FDTD, en régimen de multifotones deducido de las ecuaciones de Maxwell es usado. Los resultados numéricos de la taza de absorción específica SAR muestran el comportamiento de la SAR en función de la potencia de entrada y del factor quiral. Las principales conclusiones de nuestro trabajo son: a) la absorción de microondas es aumentada comparada con modelos clásicos, cuando valores del factor quiral normalizado son del orden de la unidad, que aparecen bajo régimen multifotónico; b) Un fenómeno de efecto pelicular inverso en 5.2 GHz con respecto a una fuente de 2.4 GHz fue observado; c) En la región metamaterial mostramos que la absorción siempre es positiva.Palabras clave: Quiralidad, tejido cerebral, FDTD, Maxwell, SAR.
ABSTRACT
A model formed by chiral bioplasma with a set of macromolecules of DNA, which represents the human head inner structure, makes possible to analyze its behavior, when it is radiated by a microwave electromagnetic field from cellular phones and WLAN's at frequencies of 2.4 and 5.2 GHz is presented. The finite difference time domain, FDTD, numeric technique is used under multiphoton regime deduced from Maxwell equations. The numerical results of the Specific
Environmental pollution is a global problem that puts the health of the population at risk. Large metropolises such as Mexico City, Lima, Santiago de Chile in Latin America and European cities such as Madrid in cold weather are affected by the appearance of so-called pollution berets, activating the respective anti-pollution protocols. PM 2.5 particulate pollutants (particles smaller than 2.5 microns)-smaller particles are the most harmful, as they can penetrate directly into the lungs and brain. A latent and little studied danger is the influence of magnetite generated in vehicle combustion as a 2.5-10 micron particulate matter deposited in the brain.
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