The silicon detectors used in the H1-PLUG calorimeter have shown increasing aging effects during the '94 run period of the electron proton storage ring HERA. These effects were particularly manifest as degradation of the signal to noise level and the calibration stability. The reasons for this behaviour have been found to be correlated with

SE HA DESARROLLADO UN NUEVO CODIGO DE ORDENADOR PARA MODELIZAR LA FORMACION DE LINEAS ESPECTRALES EN ATMOSFERAS ESTELARES EN EXPANSION ESFERICA. LA MEMORIA DE LA TESIS DESCRIBE EL FUNDAMENTO TEORICO, LOS METODOS NUMERICOS Y LOS PRIMEROS RESULTADOS. LAS TECNICAS NUMERICAS SON MUY EFICIENTES Y EL CODIGO HA DISEÑADO DE FORMA TAL QUE PERMITE FACILMENTE

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We present a comprehensive interpretation of the evolution of a small magnetic region observed during its entire disk passage. The vector magnetic field measurements from the Advanced Stokes Polarimeter, along with Hα and magnetogram measurements from the Lockheed SOUP instrument operating at the Swedish Solar Observatory on La Palma, and soft X

Two-dimensional simulations of the evolution of supernova remnants in a uniform, high-density medium are presented. The medium is magnetized, and its magnetic pressure is much larger than the thermal pressure. The evolution of the remnants is followed past full thermalization of the ejecta. A mechanism of self-collimation of the flow is identified