Browsing by Author "ESPINOZA, P"

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    A COMMERCIAL GAS ANALYZER ADAPTED FOR THERMAL-DESORPTION STUDIES
    (1993) CABRERA, AL; MORALES, E; ALTAMIRANO, L; ESPINOZA, P
    A system for thermal desorption studies can be implemented very straightforwardly from a commercial instrument designed for gas analyses. The commercial instrument incorporates a quadrupole mass spectrometer and the vacuum station to operate the spectrometer. The instrument is modified with a stainless steel six-way cross device which accommodates a sample manipulator, a leak valve and an Ar sputtering gun. The sample foil is resistively heated with very linear rates using a custom made power supply. Descriptions of the custom made sample manipulator and power supply are given. Results of hydrogen and carbon monoxide desorption from palladium foil are discussed.
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    URINARY KALLIKREIN AND PLASMA-RENIN ACTIVITY IN NORMAL HUMAN-PREGNANCY
    (1981) VALDES, G; ESPINOZA, P; MOORE, R; CROXATTO, HR