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  • 1
    Electronic Resource
    Electronic Resource
    Natural Growth Rate in 300 Primary Breast Carcinomas and Correlation to Hormone Factors (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 464 (1986), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1986.tb16069.x
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  • 2
    Electronic Resource
    Electronic Resource
    Critical behavior of a trifunctional, randomly branched polymer: percolation versus cascade theory (1991)
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 2634-2636 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00009a076
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  • 3
    Electronic Resource
    Electronic Resource
    Degradation of the nitrification inhibitor 1-amidino-2-thiourea in soils, and its action in Nitrosomonas pure culture and soil incubation experiments (1989)
    Springer
    Nutrient cycling in agroecosystems 19 (1989), S. 13-19 
    Details
    ISSN: 1573-0867
    Keywords: 1-amidino-2-thiourea ; 3,5-diamino-1,2,4-thiadiazole ; dicyandiamide ; thiourea ; nitrification inhibitor ; urea ; ammonium sulfate ; Nitrosomonas europaea ; N-fertilizer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The degradation of guanylthiourea (GTU) via 3,5-diamino-1,2,4-thiadiazole (TDZ) to dicyandiamide (DCD) was studied in selected soils. All three compounds could be determined by HPLC. GTU decomposed rapidly (within hours-days), the reaction from TDZ to DCD continued more slowly (within days-weeks). Soil type and temperature had an essential effect on the rate of degradation; conspicuous was a more rapid breakdown of GTU in presence of ammonium sulfate (AS) than in combination with urea. Each compound is a nitrification inhibitor; inNitrosomonas cell suspensions, 0.5 ppm GTU and 10 ppm TDZ achieved an effect comparable to 200 ppm DCD. The combination of these two effects—degradation in soil and inhibition of nitrification—were studied in soil incubation experiments. The three substances had inhibitory effects also in soil, however at significantly different application rates (20 ppm GTU or TDZ and 30 ppm DCD). Using these concentrations, AS/DCD and urea/GTU showed similar effects. Urea/GTU retarded nitrification by the factor 1.7 as compared to urea/DCD. AS/GTU had no advantage over AS/DCD which can be explained by the more rapid degradation of GTU in presence of AS. Urea/GTU apparently presents a promising possibility to utilize N-fertilizers more efficiently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080681
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  • 4
    Electronic Resource
    Electronic Resource
    Faltenbiludung beim ebenen Torsionsversuch (1987)
    Springer
    Archive of applied mechanics 57 (1987), S. 39-50 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary The plane torsion test serves for determining stress-strain curves of thin sheet metal. When a torque is applied simple shear takes place in the free zone of the specimen and causes principal tensile and compressive stresses. Under certain material and geometrical conditions these compressive stresses may cause buckling of the sheet, so that the assumed state of plane stress and plane strain which enables test evaluation is no longer fulfilled. This limits the applicability of the test. By using the strain energy method the critical conditions for elastic and plastic buckling have been analysed and discussed in comparison with experimentally obtained data. A variation of parameters showed how geometry could be varied in order to decrease the tendency towards buckling.
    Notes: Übersicht Der ebene Torsionsversuch dient zur Aufnahme der Fließkurven dünner Bleche. Durch die Torsionsbelastung im ringförmigen nicht abgestützten Teil der Platine ergibt sich ein Zug-Druck-Hauptspannungszustand, der bei bestimmten Werkstoff- und Geometriegegebenheiten ein Ausknicken des Bleches aus der Ebene bewirkt. Hierdurch wird von den für die Auswertung des Versuches vorausgesetzten ebenen Formänderungs- und Spannungszuständen abgewichen und somit seine Anwendbarkeit begrenzt. Mit Hilfe der Formänderungs-Energie-Methode wurden die kritischen Bedingungen für elastische und plastische Faltenbildung berechnet und experimentellen Ergebnissen gegenübergestellt. Die durchgeführte Variation der Geometrieparameter gibt darüber Aufschluß, durch welche Veränderungen die Faltenbildung unterdrückt werden kann.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00536810
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  • 5
    Electronic Resource
    Electronic Resource
    Modular transformations ofSU(N) affine characters and their commutant (1990)
    Springer
    Communications in mathematical physics 127 (1990), S. 617-636 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We describe the algebra of matrices commuting with the action of the modular group on characters ofSU(N) k integrable representations. Using methods of finite quantum mechanics we find a canonical basis for this commutant over ℂ and prove the existence of an equivalent basis over ℚ with integral matrix elements. A final section is devoted to the case ofSU(3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02104506
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  • 6
    Electronic Resource
    Electronic Resource
    Fusion and singular vectors inA 1 (1) highest weight cyclic modules (1993)
    Springer
    Communications in mathematical physics 152 (1993), S. 127-160 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We show how the interplay between the fusion formalism of conformal field theory and the Knizhnik-Zamolodchikov equation leads to explicit formulae for the singular vectors in the highest weight representations ofA 1 (1) .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02097060
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental survey of chaos in the Josephson effect (1986)
    Springer
    Journal of low temperature physics 64 (1986), S. 235-268 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The range of chaotic behavior in the Josephson effect is investigated experimentally in tin tunnel junctions and indium microbridges subjected to dc and rf bias. Chaos is found to occur between frequencies of 0.1/(2πRC) and the plasma frequency at intermediate hysteresis. The low-hysteresis onset of chaos is studied systematically by varying the critical current of an Sn/ox/Sn tunnel junction as a function of temperature. The results agree with simulations and theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00685131
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of the nitrification inhibitors 1-amidino-2-thiourea and dicyandiamide in combination with urea and ammonium sulfate (1990)
    Springer
    Nutrient cycling in agroecosystems 21 (1990), S. 179-183 
    Details
    ISSN: 1573-0867
    Keywords: 1-amidino-2-thiourea ; dicyandiamide ; nitrification inhibitor ; urea ; ammonium sulfate ; N-fertilizer ; nitrate leaching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The efficiency of the nitrification inhibitors dicyandiamide (DCD) and 1-amidino-2-thiourea (or guanylthiourea = GTU) in reducing losses from N fertilizers was investigated in two greenhouse experiments where leaching of nitrate-N was induced by percolation at 3 and 5 weeks after fertilization. At an application rate of 10% by weight of fertilizer-N (e.g. 10 kg GTU/ha), GTU in combination with ammonium sulfate (AS) had effects similar to those of DCD (e.g. 15 kg DCD/ha) with regard to nitrate leaching, plant yields and nitrogen uptake. However, in combination with urea (U), GTU was more effective than DCD when applied at the same ratio except with a humic sandy clay soil (pH 7.3, 4.4% organic C), where GTU did not perform as effectively. Nitrate leaching was reduced by as much as 50% using U/GTU instead of U/DCD, and plant yield increased by 30%. At temperatures between 17 and 25°C, the combination U/GTU could protect a high percentage of the nitrogen from being nitrified and leached over a 3 to 5 weeks period. The superiority of GTU over DCD was demonstrated especially in the treatments with 5 weeks of preincubation, despite the considerably lower application rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01087429
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  • 9
    Electronic Resource
    Electronic Resource
    FIR-spectroscopy on iron-doped YBaCuO ceramics: energy gap, phonons and a band at 500 cm−1 (1991)
    Springer
    The European physical journal 83 (1991), S. 1-5 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the reflectance of superconducting iron-doped YBaCuO ceramics in the frequency range from 20 to 10000 cm−1 for various temperatures above and belowT c . In these spectra we could directly observe an energy gap. A Kramers-Kronig analysis was performed. We discuss the temperature dependence of two infrared-active phonons and an absorption band located around 500 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314390
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of the gap distribution in YBa2Cu3O7 using a far-infrared reflection-Fabry-Pérot device (1993)
    Springer
    The European physical journal 90 (1993), S. 3-12 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports on far-infrared measurements of YBa2Cu3O7 films oriented with the c-axis perpendicular to the surface, by using a silicon reflection Fabry-Pérot interferometer as a multireflection device. From these we could derive the dielectric function, the refractive index, the field penetration depth and the surface impedance of the material. The one order of magnitude higher sensitivity of the method compared to a direct reflectance measurement allowed to find an almost continuous gap distribution in the 70–215 cm−1 region together with a separate gap at about 330 cm−1. A quasizero gap absorption is found down to 20 cm−1 even at low temperatures (10 K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01321026
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