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  • 11
    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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  • 12
    Electronic Resource
    Electronic Resource
    Cortical and striatal neurone number in Huntington's disease (1994)
    Springer
    Acta neuropathologica 88 (1994), S. 320-333 
    Details
    ISSN: 1432-0533
    Keywords: Key words Huntington's disease ; Human cerebral cortex ; Striatum ; Neurone number ; Stereology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The total cortical and striatal neurone and glial numbers were estimated in five cases of Huntington's disease (three males, two females) and five age- and sex-matched control cases. Serial 500-μm-thick gallocyanin-stained frontal sections through the left hemisphere were analysed using Cavalieri's principle for volume and the optical disector for cell density estimations. The average cortical neurone number of five controls (mean age 53±13 years, range 36 – 72 years) was 5.97×109±320×106, the average number of small striatal neurones was 82×106±15.8×106. The left striatum (caudatum, putamen, and accumbens) contained a mean of 273×106±53×106 glial cells (oligodendrocytes, astrocytes and unclassifiable glial profiles). The mean cortical neurone number in Huntington's disease patients (mean age 49±14 years, range 36 – 75 years) was diminished by about 33  % to 3.99×109±218×106 nerve cells (P≤ 0.012, Mann-Whitney U-test). The mean number of small striatal neurones decreased tremendously to 9.72 × 106± 3.64×106 ( – 88  %). The decrease in total glial cells was less pronounced (193 × 106±26 × 106) but the mean glial index, the numerical ratio of glial cells per neurone, increased from 3.35 to 22.59 in Huntington's disease. Qualitatively, neuronal loss was most pronounced in supragranular layers of primary sensory areas (Brodmann's areae 3,1,2; area 17, area 41). Layer IIIc pyramidal cells were preferentially lost in association areas of the temporal, frontal, and parietal lobes, whereas spared layer IV granule cells formed a conspicuous band between layer III and V in these fields. Methodological issues are discussed in context with previous investigations and similarities and differences of laminar and lobar nerve cell loss in Huntington's disease are compared with nerve cell degeneration in other neuropsychiatric diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310376
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  • 13
    Electronic Resource
    Electronic Resource
    Cortical and striatal neurone number in Huntington's disease (1994)
    Springer
    Acta neuropathologica 88 (1994), S. 320-333 
    Details
    ISSN: 1432-0533
    Keywords: Huntington's disease ; Human cerebral cortex ; Striatum ; Neurone number ; Stereology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The total cortical and striatal neurone and glial numbers were estimated in five cases of Huntington's disease (three males, two females) and five age-and sex-matched control cases. Serial 500-μm-thick gallocyanin-stained frontal sections through the left hemisphere were analysed using Cavalieri's principle for volume and the optical disector for cell density estimations. The average cortical neurone number of five controls (mean age 53±13 years, range 36–72 years) was 5.97×109±320×106, the average number of small striatal neurones was 82×106±15.8×106. The left striatum (caudatum, putamen, and accumbens) contained a mean of 273×106±53×106 glial cells (oligodendrocytes, astrocytes and unclassifiable glial profiles). The mean cortical neurone number in Huntington's disease patients (mean age 49±14 years, range 36–75 years) was diminished by about 33% to 3.99×109±218×106 nerve cells (P≦0.012, Mann-Whitney U-test). The mean number of small striatal neurones decreased tremendously to 9.72×106±3.64×106 (−88%). The decrease in total glial cells was less pronounced (193×106±26×106) but the mean glial index, the numerical ratio of glial cells per neurone, increased from 3.35 to 22.59 in Huntington's disease. Qualitatively, neuronal loss was most pronounced in supragranular layers of primary sensory areas (Brodmann's areae 3,1,2; area 17, area 41). Layer IIIc pyramidal cells were preferentially lost in association areas of the temporal, frontal, and parietal lobes, whereas spared layer IV granule cells formed a conspicuous band between layer III and V in these fields. Methodological issues are discussed in context with previous investigations and similarities and differences of laminar and lobar nerve cell loss in Huntington's disease are compared with nerve cell degeneration in other neuropsychiatric diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310376
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  • 14
    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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  • 15
    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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  • 16
    Electronic Resource
    Electronic Resource
    Synthesis and Structure of Tetraaryl Orthocarbonates from carbonimidic acid esters (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 95-97 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340120
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  • 17
    Electronic Resource
    Electronic Resource
    Kleben von Kunststoff mit Metall. Von W. BROCKMANN, L. DORN und H. KÄUFER. ISBN 3-540-19115-1. Berlin/Heidelberg/New York: Springer-Verlag 1989. X, 237 S., brosch., DM 98.00 (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 143-143 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410217
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  • 18
    Electronic Resource
    Electronic Resource
    Kinetical structural model for the network build-up during the reaction of cyanic acid esters with glycidyl ethers. 2. Application of DCBA/DGEBA-systems (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 535-538 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das in einer früheren Arbeit publizierte kinetisch/strukturelle Modell wird auf den Netzwerkaufbau durch Coreaktion von 2,2-Bis(4-cyanatophenyl)propan mit 2,2-Bis(4-glycidyloxyphenyl) propan in der Schmilze angewendet. Die relativen Geschwindigkeitskonstanten der Hauptreaktionen, die die freien Parameter des Modells darstellen, werden für diesen Fall identifiziert, und die gute Übereinstiummung zwischen Theorie und Experiment wird gezeigt.
    Notes: The previously published kinetical structural model is applied to the network build-up during the coreaction of 2,2-bis(4-cyanatophenyl) propane with 2,2-bis(4-glycidyloxyphenyl) propane in bulk. The relative rate constants of the main reactions, which act as the free parameters of the model, were identified for this case, and the good agreement between theory and experiment is shown.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010411006
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  • 19
    Electronic Resource
    Electronic Resource
    Pure and modified polycyanurates - polymers with great future as adhesives, casting resins, and binders for laminates (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 299-302 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Reine und modifizierte Polycyanurate sind seit etwa 20 Jahren bekannt. Gegenwärtig steht eine große Anzahl verschiedener Typen zur Verfügung. Bei Einsatz dieser Harze resultieren Verbunde mit hoher Thermostabilität, Medienbeständigkeit und sehr guten elektrischen Isolationseigenschaften. Anwendungsgebiete der Harze sind insbesondere die Kleb-, Gieß- und Laminiertechnik.
    Notes: Pure and modified polycyanurates are known for about 20 years. Up to now an important number of different special products was developed. Composites which base on polycyanurate resins show a high thermostability, stability against humidity and chemicals, and excellent electrical insulating properties. The resins are used as adhesives, binders for laminates, casting resins, and for other applications.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430601
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