Thin metallic silicide films epitaxially grown on Si(111) and their role in Si-metal-Si devices J. Vac. Sci. Technol. A 5, 2111 (1987); 10.1116/1.574931The effect of interposed silicide thickness on growth rate in bilayer silicide thinfilm structures: The Si111 /Pd2Si/Cr system J.
OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr Abstract The low-temperature molecular mobility of three different wood species was analyzed, with the two major constituents-cellulose and lignin-as reference. Mechanical and dielectric dynamic techniques were used. In order to observe the fine structure of the broad relaxation modes of wood, a very low-frequency analysis was carried out by thermostimulated current technique. Low-temperature relaxations of rosewood were assigned to low-temperature relaxations of cellulose. There was no dielectric response of lignin in rosewood. Contrarily, both cellulose and lignin responses were distinguished in ebony and varongy. Thermostimulated currents analyses exhibit the specific behavior of lignin in the various wood species. Moreover, the relaxation mode of cellulose observed at lower temperature remains localized in rosewood, while it tends to delocalize in varongy and ebony. The nature and intensity of physical interactions that induce variation of phase miscibility might be responsible for the observed differences. Even at the scale of the c relaxation, physical interactions modify molecular mobility.
La détermination quantitative des éléments minéraux donne des informations complémentaires de l'analyse des composés chimiques et de l'identification du principe actif des plantes médicinales. La fluorescence X en réflexion totale (TXRF) est un outil de choix pour cette mesure car elle est une technique rapide et multiélémentaire. Nous avons analysé par TXRF cinq échantillons des plantes endémiques malgaches après minéralisation par voie humide. Un échantillon étalon, NBS 1571, soumis au même protocole de préparation a été aussi analysé pour déterminer la précision des mesures. Les résultats d'analyse sont en bon accord avec ceux obtenus par la spectrométrie d'absorption atomique (AAS), ce qui montre la fiabilité de la fluorescence X en incidence rasante pour l'analyse des plantes médicinales.
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