Search Results

You are looking at 1 - 10 of 23 items

  • Author: P. BAUMGARTNER x
Clear All Modify Search

The possibility of recoil-labelling with high energy fission fragments has been investigated. We have found that in a mixture of ferrocene with an uranium compound the fission of uranium produces ruthenocene and iodine ferrocene. By this method carrier-free 103Ru(C5H5)2 has been produced. The relative yield of ruthenocen-(103Ru) has been measured with different ratios of uranium to ferrocene, ranging from 0.013 to 0.325. At a ratio of 0.013 about 60% of the total 103-ruthenium are bound in form of ruthenocene. The yield decreases to 45% at a ratio of 0.325. In order to explain these high yields we have to suggest that the labelling is performed not only by the primary fission ruthenium-103, but especially by secondary ruthenium-103 formed by β-decay.

Pure 99Mo (CO)6 was produced free of other reaction products by nuclear fission in a mixture of Cr(CO)6 and U3O8 according to the reaction

Cr(CO)6+U (n,f) 99Mo → 99Mo (CO)6.

The relative yield ranged up to 60% and was equal to the yield we had found formerly for the production of 103Ru (C5H5) 2 by the same method.

ABSTRACT

Heutige Webshops, die umfangreiche Artikelsortimente anbieten, verfügen häufig nur über einfache Möglichkeiten für die Katalogsuche. Oft sind die Suchergebnisse sowohl für den Kunden als auch für den Shopbetreiber unbefriedigend. Dieser Artikel befasst sich mit Suchmechanismen für die Katalogsuche, die dem Fachbereich des Information Retrievals entnommen wurden. In einer Forschungsarbeit wurde prototypisch ein neues Such-Framework realisiert, das auf dem Paice-Modell und der IR-Bibliothek Lucene basiert.