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  • 1990-1994  (166)
  • 1930-1934  (7)
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  • 11
    Electronic Resource
    Electronic Resource
    Studies of photogeneration of charge in polysilanes using thermally stimulated current measurements (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2296-2299 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Studies of photogeneration of charge in polysilanes resulting from multiple pulse excitation in thermally stimulated current (TSC) measurements are reported. The amount of charge that was photogenerated at 80 K and collected during the heating of the sample up to 300 K, ranged from 1×10−9 to 4×10−8 C/cm2 for electric fields of 10–30 V/μm and illumination energy up to 2.5 mJ/cm2 and was found to be dependent both on the electric fields applied during illumination and thermal ramping and on the illumination energy. The results are compared to an idealized model that qualitatively describes for photogeneration of the charge at 80 K and its collection during the TSC measurement. According to this model, multiple pulse excitation at 80 K leads to a buildup of photogenerated charge density in the surface region of the sample and as the temperature is increased, electron-hole recombination occurs, limiting the amount of charge collected by the external circuit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348710
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  • 12
    Electronic Resource
    Electronic Resource
    Dislocation relaxation in InAsyP1−y films deposited onto (001) InP by gas-source molecular beam epitaxy (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 3194-3196 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The strain relaxation of InAsyP1−y layers grown on (001) InP substrates by gas-source molecular beam epitaxy was examined using transmission electron microscopy (TEM) and cathodoluminescence (CL) imaging. InAsyP1−y films with a thickness of 190 A(ring) were prepared, systematically varying the As content from y=0.30 and 0.77, corresponding to a lattice mismatch between 0.97% and 2.5%. Relaxation was anisotropic, with 60° misfit dislocations lying predominantly along [11¯0], with a much lower density of dislocations along [110]. For y(approximately-greater-than)0.48, CL and plan-view TEM observations show slip traces which make angles of about ±40° with the [11¯0] direction. These slip traces correspond to pure-screw dislocation segments (gliding on {111}) cross slipping to glide on planes approximately parallel to {011}.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110196
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  • 13
    Electronic Resource
    Electronic Resource
    High-resistivity regions in n-type InGaAsP produced by 4He+ ion bombardment at 80 and 300 K (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2126-2128 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation of high-resistivity regions in Si-doped (n=1×1018 cm−3) lattice-matched In0.75Ga0.25As0.54P0.46 on InP by helium ion bombardment at 300 and 80 K has been investigated as a function of ion dose (1×1012–1×1016 cm−2) and subsequent annealing temperature (70–650 °C) by sheet resistance and Hall effect measurements as a function of temperature. Irradiations at 300 K are found to induce an increase in the resistivity by a factor of up to 3×105 relative to that of the unimplanted material. Materials bombarded at 80 K with doses higher than 7×1014 cm−2 exhibit a further increase in the sheet resistance and higher stability upon subsequent annealing. Rutherford backscattering channeling results suggest that this behavior is related to the creation of a highly polycrystalline or amorphous region in the InGaAsP layer which occurs for irradiations performed at 80 K, but not at 300 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110561
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  • 14
    Electronic Resource
    Electronic Resource
    Observation of Lomer–Cottrell locks in SiGe strained layers (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2220-2221 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Misfit dislocations in the SiGe system are usually not dissociated. We present the first observation of a Lomer–Cottrell lock array in a Si/Si1−xGex/Si heterostructure (0.4〈x〈0.6). We describe the character of the stacking faults and the partial dislocations which form the locks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103896
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  • 15
    Electronic Resource
    Electronic Resource
    The Hormones (1932)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 1 (1932), S. 413-429 
    Details
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.bi.01.070132.002213
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  • 16
    Electronic Resource
    Electronic Resource
    Mitochondrial DNA variation in Atlantic salmon, Salmo, salar L., populations (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 42 (1993), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Mitochondrial DNA (mtDNA) variation was examined in 209 Atlantic salmon from two river systems, the R. Itchen in Hampshire (Southern England) and the R. Conwy (North Wales). Within each system, five spawning sites were sampled. Four enzymes (AVA II, HAE III, HINF I and MBO I) revealed restriction fragment polymorphisms that were informative. Ten clonal lines were observed. These clones were differentially distributed between the two river systems and single clonal types were found to predominate at several spawning sites. MBO I variants were found in salmon from the R. Itchen but not the R. Conwy. A significant heterogeneity in frequency distribution of clonal lines between parr and smolt assemblages of the same year class within the R. Itchen was detected. This heterogeneity suggests that differences in survival or migratory behaviour may be identified by changes in mtDNA clonal frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb00303.x
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  • 17
    Electronic Resource
    Electronic Resource
    Solar cycle relationship clouded by Neptune's sustained brightness maximum (1991)
    [s.l.] : Nature Publishing Group
    Nature 349 (1991), S. 593-594 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have monitored the brightnesses of several objects in the outer Solar System since 1972, using precision differential photo- electric photometry to compare their apparent stellar magnitudes against a network of well-observed comparison stars close by in the sky5. For this work, we used the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/349593a0
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  • 18
    Electronic Resource
    Electronic Resource
    The transformability of tetragonal ZrO2 in some glass systems (1990)
    Springer
    Journal of materials science 9 (1990), S. 24-27 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722858
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  • 19
    Electronic Resource
    Electronic Resource
    Electrochemical induction of alkali-silica reaction in concrete (1991)
    Springer
    Materials and structures 24 (1991), S. 359-361 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Resume L’utilisation de la protection cathodique pour neutraliser la corrosion de l’acier dans le béton provoquée par le chlorure entraîne la formation d’ions hydroxyles à la surface du métal enrobé. Les essais préliminaires décrits dans cette note avaient pour but d’évaluer un éventuel effet secondaire de ce processus dans les cas où le béton contient un granulat réactif. Pour les échantillons de béton contenant un granulat de silex calciné, on a montré que l’expansion locale nocive du matériau était provoquée par la réaction silicoalcaline qui se produit dans le voisinage de l’acier enrobé quand celui-ci est soumis à une polarisation potentiostatique pendant une durée de plusieurs mois à −850 mV (échelle SCE). Des études se poursuivent dans le but d’obtenir une connaissance plus approfondie de ce phénomène et contribuer à l’évaluation de ses conséquences pratiques.
    Notes: Abstract The use of cathodic protection as a method of countering chloride-induced corrosion of steel in concrete causes the formation of hydroxyl ions at the surface of the embedded metal. The preliminary experiments described in this note were aimed at evaluating a possible side-effect of this process under circumstances where the concrete contains a potentially reactive aggregate. For concrete specimens containing calcined flint aggregate, it was shown that deleterious local expansion of the material was generated owing to alkali-silica reaction induced in the vicinity of embedded steel when the latter was subjected to potentiostatic polarization for a period of several months at −850 mV (SCE scale). Continuing investigations are aimed at providing further insight into this phenomenon to aid the assessment of its practical implications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472069
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  • 20
    Electronic Resource
    Electronic Resource
    Pulsed high-energy γ-rays from the radio pulsar PSRI706–44 (1992)
    [s.l.] : Nature Publishing Group
    Nature 359 (1992), S. 615-616 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Following the SAS-2 and COS-B high-energy y-ray observations of the Crab (0531 + 21) and Vela (0833-45) pulsars1'2, searches were made for additional y-ray pulsars3'5. No other positive results were then found, but calculations have indicated that y-ray emission is likely from other ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/359615a0
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