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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of conducting GaAs multilayers by infrared spectroscopy at oblique incidence (1990)
    Springer
    Applied physics 50 (1990), S. 7-12 
    Details
    ISSN: 1432-0630
    Keywords: 78.20 ; 78.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The electrical and geometric properties of GaAs multilayer structures are measured nondestructively by infrared reflectance spectroscopy (50–5000 cm−1). Using oblique incidence and both s- and p-polarizations of the probing beam, carrier concentration and thickness of the epitactic films as well as the carrier concentration of the GaAs substrate are determined. The main structures in the spectra are due to phonon reststrahlen bands, Fabry-Perot interferences and the zeros of the dielectric function leading to dips in the reflectance (Berreman Mode). The results compare favorably with a depth-resolved secondary ion mass spectrometric (SIMS) sample analysis. The range of applicability of the method is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323946
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  • 2
    Electronic Resource
    Electronic Resource
    Secondary ion mass spectrometry round-robin study of relative sensitivity factors in gallium arsenide (1998)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 26 (1998), S. 144-154 
    Details
    ISSN: 0142-2421
    Keywords: SIMS ; GaAs ; round-robin ; sensitivity factor ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Round-robin studies on relative sensitivity factors (RSFs) in secondary ion mass spectrometry (SIMS) were conducted using bulk GaAs samples uniformly doped with various impurity elements. A total of 31 laboratories participated in two round-robins. More than 30 sets of relative ion intensities were obtained for B, Si, Cr, Mn, Fe, Cu, Zn, In and Te in GaAs. The RSFs for both positive and negative ions were derived for several types of SIMS instruments. The effect of primary ion incident angle was examined using quadrupole-based instruments and found to be the determining factor of the instrumental dependence of RSF. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Zeitstandverhalten einiger fortschrittlicher Schaufelwerkstoffe für IndustriegasturbinenAuszug aus einer beim Fachbereich Maschinenbau der Technischen Hochschule Darmstadt einzureichenden Dr.-Ing. Diss. von M. Maier (1994)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 25 (1994), S. 273-283 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Creep rupture behaviour of some advanced materials for industrial gas turbinesThe creep rupture behaviour of three DS-alloys, an ODS-alloy and a PM-alloy for gas turbine blades is investigated up to 20 000 h test duration. Further, the elastoplastic behaviour is determined in tensile tests and the contraction behaviour in long-term annealing tests. On this basis, a characterisation of the strength and partly a modelling of the deformation behaviour of the alloys is given.
    Notes: Das Zeitstandverhalten von drei Ds-Werkstoffen, einem ODS-Werkstoff und einer PM-Legierung für Gasturbinenschaufeln wird in Versuchen bis zu 20 000 h Dauer ermittelt. Ferner wird das elasto-plastische Kurzzeitverhalten in Warmzugversuchen und das Kontraktionsverhalten in langzeitigen Glühversuchen bestimmt. Auf dieser Grundlage erfolgt eine Beschreibung des Festigkeits-und teilweise auch des Verformungsverhaltens der untersuchten Werkstoffe im Hochtemperaturbereich.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19940250704
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  • 4
    Electronic Resource
    Electronic Resource
    Ein naturwissenschaftliches Literaturkarussell. Chemie (1992)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 26 (1992), S. V 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19920260512
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Raman gain in liquid-core fibers (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 363-371 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The frequency dependence of the gain factor of stimulated Raman scattering was measured using tunable dye lasers as signal and pump light sources. In CCl4 and C2Cl4 peak gain factors of 1.3 × 10-9 cm/W and 1.7 × 10-9cm/W were obtained for the major Raman lines with a frequency shift of ν0 = 458 cm-1 and 447 cm-1, respectively. From the experimental gain factor a threshold power of 0.2 W was estimated for a liquid-core fiber filled with C2Cl4 (diameter 10 μm and length 1 km).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020406
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  • 6
    Electronic Resource
    Electronic Resource
    1H NMR and molecular mechanics studies of epimeric ethyl esters of 20(R, S)-hydroxy-23-norcholanoic acids (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 137-142 
    Details
    ISSN: 0749-1581
    Keywords: 20(R,S)-Hydroxy-23-norcholanoic acid derivatives ; 1H NMR ; Pyridine-induced shifts ; Molecular mechanics calculations ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton chemical shifts for the C-18, C-21, —CO2CH2CH3 and —CO2CH2CH3 protons of epimeric ethyl esters of 20(R,S)-hydroxy-23-norcholanoic acids were measured in deuteriochloroform and pyridine-d5. The observed solvent shifts due to specific OH - pyridine hydrogen-bonded complexes allowed the quantification of the epimeric mixtures by analysis of the pyridine-d5 1H NMR spectra. The main features of the pyridine-induced shifts are rationalized in terms of the preferred conformations for the 20R- and 20S-epimers, which are predicted by molecular mechanics calculations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290208
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