995 resultados para Deposition technique


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Dirigido a alumnos de enseñanza secundaria, presenta la técnica y la práctica para la resolución de ejercicios de razonamiento verbal. Incluye trece de los treinta y cinco tipos de preguntas que se pueden encontrar en los exámenes oficiales (los volúmenes 2, 3 y 4 de la misma serie tratan los otros tipos) en el área de lengua. Para cada tipo de ejercicio explica el objetivo del mismo y la técnica que se debe seguir para su realización, con ejemplos y notas aclaratorias, y a continuación presenta un ejercicio práctico para aplicar dicha técnica. Al final del libro hay una tabla para apuntar los resultados de cada test y controlar el progreso del alumno, y un apartado con las soluciones.

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Previous results concerning radiative emission under laser irradiation of silicon nanopowder are reinterpreted in terms of thermal emission. A model is developed that considers the particles in the powder as independent, so under vacuum the only dissipation mechanism is thermal radiation. The supralinear dependence observed between the intensity of the emitted radiation and laser power is predicted by the model, as is the exponential quenching when the gas pressure around the sample increases. The analysis allows us to determine the sample temperature. The local heating of the sample has been assessed independently by the position of the transverse optical Raman mode. Finally, it is suggested that the photoluminescence observed in porous silicon and similar materials could, in some cases, be blackbody radiation

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The quenching of the photoluminescence of Si nanopowder grown by plasma-enhanced chemical vapor deposition due to pressure was measured for various gases ( H2, O2, N2, He, Ne, Ar, and Kr) and at different temperatures. The characteristic pressure, P0, of the general dependence I(P)=I0exp(-P/P0) is gas and temperature dependent. However, when the number of gas collisions is taken as the variable instead of pressure, then the quenching is the same within a gas family (mono- or diatomic) and it is temperature independent. So it is concluded that the effect depends on the number of gas collisions irrespective of the nature of the gas or its temperature

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This paper details a technique for training auditory memory for length of speech sounds in preschool children with a profound hearing loss.

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This paper discusses the effectiveness of a remedial reading program for hearing impaired children.

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This paper studies aural rehabilitation efforts designed to address the compensatory strategies used by hearing-impaired adults and evaluates the success of an eight week group communications-based therapy program.