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  • 1995-1999  (7)
  • 1985-1989  (7)
  • 1945-1949  (2)
  • 11
    Electronic Resource
    Electronic Resource
    On an Implementation of Standard Bases and Syzygies in SINGULAR (1996)
    Springer
    Applicable algebra in engineering, communication and computing 7 (1996), S. 235-249 
    Details
    ISSN: 1432-0622
    Keywords: Key words Standard bases ; Syzygies ; Computer algebra system ; Highest corner ; EcartMethod.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics , Technology
    Notes: Abstract  We describe an implementation of a general standard basis algorithm, valid for any monomial ordering compatible with the natural semigroup structure. We concentrate on new strategies which have proved useful, in particular in the non-wellordering case. Moreover, we describe the first implementation of Schreyer’s method to compute syzygies and compare it with other, more classical methods. Comparisons of the computing time of several examples in the system SINGULAR give hints as to which strategies should be used in different classes of examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190332
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  • 12
    Electronic Resource
    Electronic Resource
    High-resolution analytical transmission electron microscopy of semiconductor quantum structures (1999)
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 217-220 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Analytical transmission electron microscopy was applied to characterize the size, shape, real structure, and, in particular, the composition of different semiconductor quantum structures. Its potential applicability is demonstrated for heterostructures of III-V semiconducting materials and II-VI ones, viz. (In,Ga)As quantum wires on InP and (In,Ga)As quantum dots on GaAs both grown by metal organic chemical vapor deposition, and CdSe quantum dots on ZnSe grown by molecular beam epitaxy. The investigations carried out show that the element distribution even of some atomic layers can be detected by energy-dispersive X-ray spectroscopy, however, exhibiting a smeared profile. Contrary to that, sub-nanometre resolution has been achieved by using energy-filtered transmission electron microscopy to image quantum dot structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051476
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  • 13
    Electronic Resource
    Electronic Resource
    Zur Frage der enzymatischen Spaltung von Digitalisglykosiden im Organismus (1949)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 208 (1949), S. 46-47 
    Details
    ISSN: 1432-1912
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248002
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    Paper (German National Licenses)
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  • 14
    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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  • 15
    Electronic Resource
    Electronic Resource
    Experimental results on muon-catalyzed dt fusion (1996)
    Springer
    Hyperfine interactions 101-102 (1996), S. 67-80 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comprehensive experimental study of the kinetics of muon-catalyzed dt fusion has been conducted at PSI, based on the measurement of the 14 MeV neutrons from the fusion process. The target conditions included densities from 1–150% of the atomic density of liquid hydrogen, relative tritium concentrations of 2–95%, and temperatures of 13–300 K. Information about the dt cycle has been obtained from the measured neutron time distributions by different methods: Monte Carlo simulations primarily aimed at investigating epithermal effects in molecular formation and the determination and interpretation of cycling rates describing the steady state regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02227607
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  • 16
    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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    Paper (German National Licenses)
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