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  • Articles  (45)
  • Chemistry  (40)
  • 61.40  (3)
  • 05.70 Jk  (1)
  • 1A-1R, 1B–1R wheatrye double translocation  (1)
  • 64  (1)
  • STRUCTURAL MECHANICS
  • 1
    Electronic Resource
    Electronic Resource
    Autocompensation doping in light-soaked and in radiation-damaged a-Si:H (1991)
    Springer
    Applied physics 52 (1991), S. 335-338 
    Details
    ISSN: 1432-0630
    Keywords: 61.40 ; 61.80 ; 72.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract n-type a-Si:H films have been irradiated with light, electrons, protons and heavy ion beams. It is shown that the non-thermal creation of dangling-bond defects activates significant densities of previously inactive phosphorus dopants. The relevance of these results is discussed with respect to equilibration phenomena in doped material and with respect to degradation phenomena in a-Si:H solar cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324775
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  • 2
    Electronic Resource
    Electronic Resource
    Accumulation and annealing of implantation damage in a-Si:H (1991)
    Springer
    Applied physics 53 (1991), S. 235-240 
    Details
    ISSN: 1432-0630
    Keywords: 61.40 ; 61.80 ; 72.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Hydrogenated amorphous silicon (a-Si:H) films have been irradiated with H+, B+, P+, and Ar+ ion beams. The accumulation and the annealing of irradiation-induced defects has been investigated through a series of electronic transport and PDS measurements. We find that for all projectiles damage accumulation is dominated by atomic displacement collisions with the damage saturating for energy transfers in excess of about 10 eV/target atom. Annealing at elevated temperatures causes the conductivity of doped and irradiated a-Si:H films to increase according to stretched exponential decay curves. All annealing parameters derivable from such fits scale with the energy originally dissipated into atomic displacement collisions. For energy transfers up to 10 eV/target atom the activation energy for annealing increases up to a saturation value and, at the same time, an increasing fraction of the irradiation-induced defects becomes stable against annealing at moderate temperatures (T a〈250° C). We discuss these results with respect to damage accumulation data in crystalline silicon (c-Si) and with regard to the annealing of metastable defects in a-Si:H.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324258
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  • 3
    Electronic Resource
    Electronic Resource
    Defects and impurities in amorphous semiconductors and in liquid electrolytes (1992)
    Springer
    Applied physics 54 (1992), S. 40-46 
    Details
    ISSN: 1432-0630
    Keywords: 61.40 ; 71.55 ; 82.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Amorphous (a-) semiconductors like a-Si:H and the chalcogenide glasses possess a general tendency to establish an overall equilibrium between the electronic system and the lattice with its dopant and defect sites. In the present paper the chemical interactions which establish these equilibria within the bulk of the a-semiconductor lattices are compared to chemical interactions in liquid electrolytes, particularly to those in H2O. These considerations reveal close similarities between autocompensation doping in a-semiconductors and acid/base reactions in H2O. The effects of light and field-effect induced defect formation, on the other hand, are shown to be related to the phenomenon of electrolysis in H2O. The consideration of these analogies further emphasizes the roles of charge-carrier localization and that of H-diffusion in promoting dopant and defect equilibration reactions in a-semiconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348128
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  • 4
    Electronic Resource
    Electronic Resource
    Electrophoretic protein analysis for the identification of doubled haploid 1A–1R, 1B–1R wheat-rye double translocation lines and for the assessment of their genetic stability (1993)
    Springer
    Theoretical and applied genetics 86 (1993), S. 547-556 
    Details
    ISSN: 1432-2242
    Keywords: Gliadin ; HMW glutenin ; SDS electrophoresis ; Biochemical marker ; 1A-1R, 1B–1R wheatrye double translocation ; Doubled haploids ; Triticum aestivum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Eighteen available doubled haploid wheat lines with a cytologically proven 1A–1R, 1B–1R double translocation, which where derived via anther culture from four crosses of the 1A–1R wheat-rye translocation cv “Amigo” with several 1B–1R wheat-rye translocation forms, were subjected to electrophoretic seed protein analysis. Besides, the five parents used in the crosses and some other wheat cultivars and doubled haploid lines (19 with a 1B–1R single translocation, 10 with a 1A–1R translocation and 7 without any 1R translocation) were also included in the investigation. It was found that the gliadin patterns visualized after SDS polyacrylamide gel electrophoresis of alcohol-soluble seed protein extracts can differentiate not only 1B–1R and 1A–1R translocation forms from wheats without any 1R-translocation chromosome, but also 1B–1R and 1A–1R wheats from each other. Moreover, 1A–1R, 1B–1R double translocation lines can be distinguished as well due to characteristic differences revealed between 1A–1R and 1B–1R translocation forms. Thus, all of tested dh1- and dh2-grains of the double translocation lines showed the expected doublet: the 1A–1R translocation (“Amigo”)-typical rye band and the 1B–1R translocation (“Kawkas”)-typical rye band. Consequently, gliadin patterns estimated after SDS electrophoresis may be used as markers for the fast detection of the desired 1A–1R, 1B–1R double translocation forms among 1A–1R single translocation lines, 1B–1R single translocation lines and lines without any 1R-translocation in the progenies of appropriate crosses. Furthermore, by means of gliadin tests on the dh2-generation the excellent stability of the double translocation 1A–1R, 1B–1R during more than one propagation phase has been proven. Estimations of high-molecular weight (HMW) glutenin subunits coded by 1A and 1B chromosomes are compatible with the double translocation constitution. A few deviating results can be explained by crossing-over events. Seed protein analysis revealed that it is possible to produce 1A–1R, 1B–1R double translocation lines with good glutenin compositions provided that adequate favourable parents are used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00838707
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  • 5
    Electronic Resource
    Electronic Resource
    Surface impedance of epitaxial YBCO thin films — Comparison of experimental data with a d-wave theory of superconductivity (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 503-508 
    Details
    ISSN: 1573-7357
    Keywords: 05.70 Ln ; 05.70 Jk ; 64
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The surface impedance of two 350nm thick YBCO films was measured for temperatures between 4.2K and 150K in a copper cavity at 87 GHz. Both films, one grown by electron beam evaporation on MgO, the other one by high oxygen-pressure dc sputtering from a stoichiometric target on LaAlO3, provide critical temperatures of about 91K, low residual surface resistances of Rs(4.2K) 〈 1mΩ and low specific resistivities in the normal state of ϱ(100K) 〈 85μΩcm. The experimental data obtained on these two films are compared to a d-wave model of superconductivity which incorporates elastic and inelastic scattering. Good agreement between theory and the experimental results for both the surface resistance and the penetration depth in the whole temperature range is achieved for scattering phase shifts near 0.4π and order parameter amplitudes in the range of 2Δ0(0)/kBTc = 6.0 – 7.5 without subtracting an extrinsic residual surface resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768435
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  • 6
    Electronic Resource
    Electronic Resource
    Photoluminescence and efficiency of Ce3+ in SrS powders (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 131-136 
    Details
    ISSN: 1057-9257
    Keywords: II-VI compound ; SrS : Ce ; Photoluminescence ; Concentration quenching ; Phosphorescence ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The luminescence efficiency of SrS: Ce powders in the doping range from 0.01 to 1.0 at.% was investigated by photoluminescence decay studies. The radiative decay time of Ce3+ in SrS was determined to be 27 ns. The onset of concentration quenching at concentrations higher than about 0.7 at.% has been obtained. The photoluminescence spectrum of Ce3+ exhibits two emission bands as a consequence of the ground state splitting. The Huang-Rhys factor of the 5d-4f transition was estimated to be about 6. The inhomogeneous broadening of the emission band of samples with higher doping level has been investigated by site-selective and time-resolved spectroscopy.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860030119
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  • 7
    Electronic Resource
    Electronic Resource
    Bekturov, E. A.; Bakauova, Z. Kh.: Synthetic Water-Soluble Polymers in Solution 241 S., 87 Abb., 30. Tab., Format 15 × 23 cm. Basel/Heidelberg/New York: Huethig & Wepf 1986 (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 1038-1038 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290613
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Kinetik der photoinduziertenRadikalpolymerisation mit Elektronendonator/Elektronenakzeptor-InitiatorsystemenLichtinitiierte Polymer- und Polymerisationsreaktionen 33. Mitt.; 32. Mitt.: Kronfeld, K. P.; Timpe, H.-J.: J. Photochem.; zur Publikation eingereicht.Herrn Prof. Dr. W. Pritzkow zum 60. Geburtstag gewidmet (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 704-716 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kinetics of Photoinduced Radical Polymerization with Electron Donor/Electron Acceptor Initiator SystemsBy means of benzyltriphenylphosphonium tetrafluoroborate (P⊕) and anthracene (An) as photoinitiator system and methylmethacrylate (MMA) as monomer the influences of several reaction parameters on the polymerization quantum yield Φp, were studied. The following principal reactions proceed: electron transfer between excited An (1An) and P⊕ salt (kq = 2,5 · 109 M-1 s-1), quenching of 1An by MMA (kqMMA = 1,3 · 107 M-1 s-1), reaction between a 1An…P⊕ salt complex and MMA. The last reaction is assumed, since from the disappearance of An and the formation of An cation radical, respectively, rate constants kqMMA 〉 108 M-1 s-1 have been calculated. Furthermore, it is assumed, that only the quenching of 1An by MMA (Φp = 3,8) and the addition of free radicals, produced by the photoinduced electron transfer, lead to polymer formation. Kinetic equations were developed, which can explain the effect of P⊕-salt concentration, light intensity and MMA concentration on Φp data. The quotient obtained for kp/kt0,5 is in the range of 0,053 to 0,087 M-0,5 s-0,5, depending on the used experimental parameters. Polymerization degrees Pn of 260-590 were found, which also depend on the experimental parameters.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300505
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  • 9
    Electronic Resource
    Electronic Resource
    Über Versuche zur Drucksynthese von HexachlorotitanatenProfessor Georg Brauer zum 60. Geburtstage gewidmet (1968)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 357 (1968), S. 172-176 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Experiments for preparing hexachlorotitanates by reaction of TiCl4 with alkali chlorides or calcium chloride in pressure bombs at 550-750°C are described. Pure K2TiCl6 and Cs2TiCl6 were obtained, whereas the reaction products from LiCl, NaCl and CaCl2 contained not more than 4 to 6.5 weight per cent of titanium. A content of up to 0.24 weight per cent trivalent titanium is found at higher temperatures resulting from evolution of elemental chlorine from the titanium tetrachloride.
    Notes: Es werden Versuche zur Darstellung von Hexachlorotitanaten aus TiCl4 und Alkalichlorid oder Calciumchlorid in Druckbomben bei Temperaturen von 550-750°C beschrieben. K2TiCl6 und Cs2TiCl6 können dabei rein und wasserfrei erhalten werden, während mit LiCl, NaCl und CaCl2 nur Produkte mit Titangehalten von max. 4 bis 6,5 Gew.-% entstehen. Mit steigender Versuchstemperatur treten in den Präparaten durch Cl2-Abspaltung aus dem TiCl4 entstandene Gehalte an dreiwertigem Titan auf, die bis zu 0,24 Gew.-% betragen können.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19683570403
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  • 10
    Electronic Resource
    Electronic Resource
    Koordinationschemische Untersuchungen an Zinkdialkylen. XIV. Über Lithium- und Zink-3-(N, N-dialkylamino)-propyl-Verbindungen (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 462 (1980), S. 152-158 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on the Coordination Chemistry of Zinc Dialkyls. XIV. On Lithium and Zinc 3(N, N-Dialkylamino)propyl CompoundsIt is reported on synthesis and properties of organo lithium compounds of the type [R2NCH2CH2CH2Li]n. The structure is proposed by reason of molecular weight determination and 13C-NMR spectra.In dependence of the molar ratio the lithium dialkylamino propyls and the corresponding Grignard reagents react with zinc chloride forming dimer alkyl zinc chlorides [R2NCH2CH2CH2ZnCl]2 or monomer spiranoide chelate complexes of the formula [R2NCH2CH2CH2]2Zn (R = CH3, C2H5).
    Notes: Es wird über die Synthese und die Eigenschaften von Organolithium-verbindungen des Typs [R2NCH2CH2CH2Li]n berichtet und ein Strukturvorschlag aufgrund von Molmassebestimmungen und 13C-NMR-Spektren unterbreitet.Die Lithium-dialkylaminopropyle sowie die entsprechenden Grignardverbindungen reagieren mit Zinkchlorid je nach Molverhältnis der Reaktionspartner zu dimeren Alkylzinkchloriden [R2NCH2CH2CH2ZnCl]2 bzw. monomeren, teilweise schon bekannten, spiranoiden Innerkomplexen der Formel [R2NCH2CH2CH2]2Zn (R = CH3. C2H5).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804620116
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