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  • Polymer and Materials Science  (2)
  • 61.40.−a  (1)
  • 66.30  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 38 (1985), S. 49-56 
    ISSN: 1432-0630
    Schlagwort(e): 66.30 ; 82.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Thin layers of GaAs are heavily doped locally by laser induced Se or Zn diffusion. H2Se or diethylzinc gases are used to provide Se or Zn dopant atoms. The surface is locally heated with 3 ns light pulses from a Q-switched frequency doubled Nd-YAG laser. The doping process is described in detail. Doping profiles and sheet carrier concentrations are measured as a function of substrate temperature, laser fluence and processing time. Dopant concentrations of more than 1021 cm−3, with a thickness of the doped layer of less than 20 nm can be achieved.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1432-0649
    Schlagwort(e): 78.50.−w ; 61.40.−a
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We investigated the effects of an electric field on a spectral hole burned in the inhomogeneously broadened S 0–S 1 transition of perylene in different samples of the polar polymer polyvinylbutyral (PVB) and in cellulose nitrate. The spectral hole is broadened and reduced in depth by the electric field. It was checked experimentally for perylene in PVB that the hole area remains constant when an electric field is applied. We determined the effective matrix-induced electric dipole moment differences δμ* for perylene in different PVB samples and in cellulose nitrate. Within experimental accuracy the value of δμ* is approximately independent of the composition of PVB and its water content. For perylene in cellulose nitrate the value of δμ* is larger by a factor of 1.5 than in PVB. The results are discussed on the basis of a simple model for the electric field effect.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 0142-2421
    Schlagwort(e): SIMS ; GaAs ; round-robin ; sensitivity factor ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: 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.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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