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  • 1990-1994  (12)
  • 1985-1989  (7)
  • 1975-1979  (5)
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  • 11
    Electronic Resource
    Electronic Resource
    Measurement of the stopping power of Au and MgF2 for slow muons (1993)
    Springer
    The European physical journal 346 (1993), S. 81-84 
    Details
    ISSN: 1434-601X
    Keywords: 36.10.Gv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spectral flux densityn(T) of μ− emerging from a Au or MgF2 moderator has been measured at low energiesT using time-of-flight. Fromn(T) the stopping powerS(T) of Au was determined for 2 keV≤T≤22 keV, and of MgF2 for 2 keV≤T≤12 keV. For Au,S(T) is smaller than calculated values obtained from proton atomic data practically in the wholeT range (Barkas effect); at lowT S(T) approaches the calculated values. For MgF2,S(T) agrees fairly with the calculated values above 5 keV and then drops below these values. We ascribe this dropping to the large energy gap of the MgF2 insulator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290784
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  • 12
    Electronic Resource
    Electronic Resource
    Absolute pionic x-ray intensities in Mg and Fe (1991)
    Springer
    The European physical journal 341 (1991), S. 101-105 
    Details
    ISSN: 1434-601X
    Keywords: 36.10.Gv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Absolute pionic x-ray intensities have been measured for Mg and Fe. The accuracy achieved was 2% of the line intensity for the most prominent transitions. In the Balmer series of Mg and the Paschen series of Fe the crossover transitions were found to be even more attenuated than the transitions between circular states, as deduced, for example, by comparison with muonic atoms; no crossover transitions were observed in the Fe Balmer series. According to cascade calculations based on the experimental intensities more than half of the pions are absorbed in Fe already from levels with principal quantum numbern〉17 by strong interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281280
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    On cyclic branched coverings of spheres (1975)
    Springer
    Mathematische Annalen 215 (1975), S. 289-291 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01343895
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    Paper (German National Licenses)
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  • 14
    Electronic Resource
    Electronic Resource
    Dissolution of platinum metal alloys contained in the feed clarification sludge (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 152 (1991), S. 199-206 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The dissolution behaviour of two alloys, which represent the metallic precipitates, occurring in the dissolution step of a nuclear reprocessing plant was investigated. The solubility of these alloys, containing Mo, Ru, Rh and Pd, in HNO3-solutions is rather low and dissolution ceases after some time, caused by passivation. A significant acceleration of the dissolution rate takes place if ozone is passed through the alloy/HNO3-suspension, or if an electrolytic dissolver with or without an oxidation catalyst is used. Moreover, Ru can be separated as RuO4 by distillation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042153
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  • 15
    Electronic Resource
    Electronic Resource
    Effect of ribbon-wheel contact on the microstructure of melt-spun Al-Cu eutectic alloy ribbons (1985)
    Springer
    Journal of materials science 20 (1985), S. 3141-3149 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microstructure of melt-spun Al-17.3 at% Cu eutectic alloy ribbons with different thicknesses have been revealed by means of electron microscopy and X-ray techniques. Thick ribbons (〉20μm) consist of finely-dispersed α-Al and Al2Cu equilibrium phases showing lamellar or irregular morphology. In thin ribbons a considerable fraction of supersaturated α-Al solid solution and the metastable Al4Cu9 phase have been detected. The experimental facts on the identity of the phases, their morphology and particle size for given processing conditions are discussed within the framework of a heat flow model including the solidification process as well as post-solidification transformations. The microstructural features are considered to be determined by local and time variations of the ribbon-wheel contact.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545179
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  • 16
    Electronic Resource
    Electronic Resource
    Epithermal effects in muon-catalyzed dt fusion: comparison of experimental data with theoretical predictions (1993)
    Springer
    Hyperfine interactions 82 (1993), S. 391-406 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Very high dtμ molecular formation rates for epithermal (i.e., not thermalized) muonic tritium atoms have been observed in experiments and are predicted by theory. The present detailed analysis shows qualitative agreement although further calculations will be needed to reach a complete understanding of all processes involved. The importance of epithermal effects for a correct description of muon-catalyzed fusion phenomena has been confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01027975
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  • 17
    Electronic Resource
    Electronic Resource
    The kinetics of muon-catalyzed dt fusion (1993)
    Springer
    Hyperfine interactions 82 (1993), S. 357-372 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A main source of information about the muon-catalyzed fusion cycle in D-T mixtures are the cycling rates λc, which are characteristic for the kinetic equilibrium of states attained rapidly in dense targets. The measurement, analysis and interpretation of these rates will be discussed, concentrating on the extensive set of rates observed at PSI over the last decade in gaseous, liquid and solid targets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01027973
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  • 18
    Electronic Resource
    Electronic Resource
    Entwicklung eines Analysenverfahrens für Rutheniumspuren in Pflanzenmaterial und Ermittlung der Transferfaktoren Boden/Pflanzen für Rutheniumverbindungen aus Wiederaufarbeitungsanlagen (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 331 (1988), S. 310-315 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Considerably different transfer factors soil/plant are reported in literature for the fission product ruthenium. As ruthenium belongs to those radioactive nuclides, that could be released from a reprocessing plant during an accident, reliable transfer factors should be explored under middle-European conditions for some typical nutrition plants. In an artificial humous and sandy soil spiked with 106Ru as RuO2 and RuCl3, pasture grass was grown under artificial illumination in our laboratory. The amounts of ruthenium taken up by the plants were determined by γ-spectrometry. For open-air investigations with pasture grass, wheat and potatoes inactive ruthenium(III) chloride and ruthenium nitrosylchloride were used. Ruthenium was determined by electrothermal atomic absorption spectrometry (ETAAS) after destroying the organic material and concentrating the solution. The concentration and chemical form of the ruthenium exert an unimportant influence on the transfer factor. For the pasture-grass, the stems of wheat and the weed of potatoes it amounts to 0.00005 to 0.0015, for the ear of wheat to about 0.00005. In peeled potatoes there was no ruthenium detectable, therefore the limit of detection leads to a transfer factor ≤0.00001. So it is evident that ruthenium is little available for the roots of the plants. In the event of an accident in a nuclear plant the uptake of radioactive ruthenium by roots has only negligible radioecological consequences. This applies even if 50 years of ruthenium enrichment in the soil are assumed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00481901
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  • 19
    Electronic Resource
    Electronic Resource
    Anwendung von Austauschern mit cyklischen Polyäthern als Ankergruppen in der Mikro- und Spurenanalyse (1977)
    Springer
    Microchimica acta 68 (1977), S. 279-288 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary There is given a synopsis about the characteristics of new-fashioned exchangers based on cyclic polyethers-a field of activity with a great future. With the application of the described measuring methods the determinations of the separated compounds are possible to the range ofμg and pg. Enrichments of traces can be easily realized.
    Notes: Zusammenfassung Eine Übersicht über die Eigenschaft neuartiger Austauscher mit cyklischen Polyäthern als Ankergruppen-ein Arbeitsgebiet, das noch stark ausbaufähig ist-wurde gegeben. Unter Verwendung der beschriebenen Meßanordnungen sind Bestimmungen der getrennten Verbindungen bis in den Mikro- und Spurenbereich (μg bis pg) möglich. Spurenanreicherungen lassen sich gut durchführen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196212
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  • 20
    Electronic Resource
    Electronic Resource
    Forces on intraocular lens haptics induced by capsular fibrosis (1990)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 228 (1990), S. 363-368 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Electronic dynamometry measurements, performed upon intraocular lens (IOL) haptics of prototype one-piece three-loop silicone lenses, accurately defined the relationships between elastic force and haptic displacement. Lens implantations in the capsular bag of dogs (loop span equal to capsular bag diameter, loops undeformed immediately after the operation) were evaluated macrophotographically 5–8 months postoperatively. The highly constant elastic property of silicon rubber permitted quantitative correlation of subsequent in vivo haptic displacement with the resultant force vectors responsible for tissue contraction. The lens optics were well centered in 17 (85%) and slightly offcenter in 3 (15%) of 20 implanted eyes. Of the 60 supporting loops, 28 could be visualized sufficiently well to permit reliable haptic measurement. Of these 28, 20 (71 %) were clearly displaced, ranging from 0.45 mm away from to 1.4 mm towards the lens' optic center. These extremes represented resultant vector forces of 0.20 and 1.23 mN respectively. Quantitative vector analysis permits better understanding of IOL-capsular interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00920063
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