Cosmic ray neon, Wolf-Rayet stars, and the superbubble origin of galactic cosmic rays

The abundances of neon isotopes in the galactic cosmic rays (GCRs) are reported using data from the Cosmic Ray Isotope Spectrometer (CRIS) aboard the Advanced Composition Explorer (ACE). We compare our ACE-CRIS data for neon and refractory isotope ratios, and data from other experiments, with recent results from two-component Wolf-Rayet (WR) models. The three largest deviations of GCR isotope ratios from solar-system ratios predicted by these models are indeed present in the GCRs. Since WR stars are evolutionary products of OB stars, and most OB stars exist in OB associations that form superbubbles, the good agreement of these data with WR models suggests that superbubbles are the likely source of at least a substantial fraction of GCRs.Comment: 22 pages, 6 figures Accepted for publication by Ap

Prozessmesstechnik mittels integriert-optischer Sensoren auf Glasbasis (IO-Glas II) Schlussbericht

SIGLEAvailable from TIB Hannover: F94B912 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Herstellung und messtechnische Charakterisierung von duennen PVD-Metalloxidschichten fuer den Einsatz in Mikrogassensoren. Teilvorhaben: Auslegung und Pruefung der Entwicklungsmuster Abschlussbericht

Gas measurements were performed with the developed design specimens of Ga_2O_3 sensors of Siemens AG and the NiO sensors of TU Berlin. The Ga_2O_3 sensors were tested for their fitness for use in the monitoring of ambient atmospheres for explosive gases or gas mixtures. The NiO sensors were tested primarily for applicability to selective detection of hydrogen. Furthermore, the sensitivity of modified NiO sensors (Au-doped) for hydrogen sulfide detection was examined. (CB)Gasmessungen wurden an Entwicklungsmustern von Ga_2O_3-Sensoren der Siemens AG und an NiO-Sensoren der TU-Berlin durchgefuehrt. Die Untersuchung der Ga_2O_3-Sensoren erfolgte im Hinblick auf die Eignung fuer den Einsatz zur Ueberwachung von Umgebungsatmosphaeren auf explosive Gase bzw. Gasgemische. Bei der Untersuchung der NiO-Sensoren stand die Ueberpruefung der Eignung der Sensoren fuer den Einsatz zur selektiven Wasserstoffdetektion im Vordergrund. Weiterhin wurde die Empfindlichkeit von modifizierten NiO-Sensoren (Au-dotiert) auf Schwefelwasserstoff getestet. (orig./MM)SIGLEAvailable from TIB Hannover: F97B2087+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Factors affecting trypanosome prevalence in Zebu cattle exposed to high trypanosomiasis risk in south-west Ethiopia

Determines factors affecting trypanosome prevalence in Zebu cattle exposed to high trypanosomiasis risk in south west Ethiopia. Studies the occurrence of trypanosome infection in adult cattle, monthly trypanosome prevalence in calves and cattle, prevalence in male and female adult cattle, relation between different levels of PCV in infected and unaffected adult cattle and infection rates

Health and performance of zebu cattle exposed to trypanosomiasis risk in S.W. Ethiopia

Reports the results of an 18-month study on the prevalence, species and intensity of trypanosome parasitaemias in East African Zebu cattle managed in ten village herds in four areas around Ghibe, S.W. Ethiopia. Gives an estimation of tsetse related density and trypanosome infection rates in tsetse, reports the effects of trypanosome infection on PCV, and includes some preliminary performance results