Borrelia, Ehrlichia, and Rickettsia spp. in Ticks Removed from Persons, Texas, USA

Some tick-borne agents may pose yet-unknown public health risks

IONIC TRANSPORT IN CADMIUM FLUORIDE

Ces dernières années, les études de CdF2 ont connu un grand essor en raison de sa faculté de se transformer d'un isolant à un semiconducteur. Cette conversion est permise par le désordre thermique du réseau, constitué de défauts de Frenkel dans le sous-réseau des anions. A l'encontre des études détaillées des propriétés optiques et diélectriques à basse température, les données à haute température sur le transport ionique intrinsèque et la structure du défaut dans ce cristal sont encore incomplètes et contradictoires. Dans cet article, des résultats expérimentaux récents sur la conductivité ionique et l'autodiffusion dans CdF2 non converti sont réexaminés. Nous tentons de mettre des limites aux valeurs probables des paramètres du désordre et nous montrons que quelques aspects des résultats vont au-delà du domaine du transport ionique dans les solides accessibles par la théorie classique.In recent years, CdF2 has attracted considerable interest owing to its ability to be converted froni an insulator to a semiconductor. This convertibility is rendered possible by the thermal disorder of the lattice, consisting of Frenkel defects in the anion sublattice. Contrary to extended investigations of the low-temperature electrical and optical properties, data on high-temperature intrinsic ionic transport and defect structure in this crystal are still incomplete and controversial. In this paper, recent experimental results on ionic conductivity and self-diffusion in unconverted CdF2 are revised. We try to set limits to the probable values of the disorder parameters and show that some features of the results go beyond the reach of the classical theory of ionic transport in solids

Molekuelorganisation in duennen Polymerschichten durch Elektronenstrahlpolarisierung Schlussbericht

Electron beam poling was developed and applied to thin polymer layers by use of a scanning electron microscope. Molecular manipulations of orientation and conformation of the molecules were induced by focussed electron beams, and detected by means of infrared spectroscopy as well as by non-linear optical methods. Using electron beam microlithography microscopic polarization gratings and other structures have been written into thin fluoropolymer layers by means of a direct, computer-controlled writing process; they were read out through potential contrast images as well as by studies concerning Second Harmonic Generation (SHG). The optically non-linear polarization gratings represent coherent light sources with strong diffracting effect as to the Second Harmonic. Within the framework of the project a new non-linear optical method for phase-selective SHG investigations was developed. (orig.)SIGLEAvailable from TIB Hannover: F96B1135+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Thermischer Abbau von duennen Polycyanuratschichten auf Metallen Abschlussbericht

SIGLEAvailable from TIB Hannover: F94B0726+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Technikfolgenabschaetzung in der Informationstechnik. Bewertung und Ausblick

SIGLEAvailable from TIB Hannover: F96B197+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman