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  • 1990-1994  (9)
  • 1985-1989
  • 1992  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Epitaxial silicon growth conditions and kinetics in low-temperature ArF excimer laser photochemical-vapor deposition from disilane (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1137-1148 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Homoepitaxial Si films were deposited using an ArF excimer laser beam parallel to the substrate to photodissociate Si2H6 at low temperatures (250–350 °C) under laser intensity and Si2H6 partial pressure conditions that result in low initial photofragment concentrations (〈 1013 cm−3). Total pressure and flow conditions were chosen such that there is little secondary photolysis of the initial photofragments. The deposition yield of solid Si from photoexcited Si2H6 is estimated to be 0.20±0.04, indicating that in order for film growth to result solely from the primary products in ArF laser (193 nm) photolysis of Si2H6, a sticking coefficient ≥0.6 must be assigned to the dominant growth precursor. Growth rates vary linearly with laser intensity and Si2H6 partial pressure over a range of 1–15 mJ/cm2 pulse and 5–40 mTorr, respectively. Increasing the distance between the laser-beam axis and the silicon substrate results in a reduction of the growth rate that can be explained by gas-phase chemical reaction of the growth precursors as they diffuse to the substrate. Epitaxy is maintained for temperatures above the threshold for thermal decomposition of surface (SiH2)n chains at ∼250 °C, and for temperatures below the onset of Si2H6 pyrolysis and rapid thermal desorption of surface H2 at ∼350 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351791
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen desorption on various H-terminated Si(100) surfaces due to electron beam irradiation: Experiments and modeling (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 580-582 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hydrogen desorption from (2×1) and (3×1) H-terminated Si(100) surfaces due to irradiation by electron beams with 2–5 keV beam energies has been investigated both experimentally and theoretically. Auger electron spectroscopy (AES) has been employed to monitor Si, O, and C signals periodically with continuous irradiation of an electron beam on H-terminated Si(100) surfaces. An incubation phenomenon is observed in the time evolution profiles of the Si, O, and C AES signals for all H-terminated Si(100) surfaces. The incubation period is believed to be associated with the time required for desorption of hydrogen from the H-terminated Si surface as a result of electron beam irradiation. Among (2×1) and (3×1) H-terminated Si(100) surfaces, the (3×1) surface is found to have greater hydrogen coverage than (2×1) surface. The hydrogen desorption cross section is found to range from 4×10−19 to 8×10−18 cm2 and decrease with increasing beam energy in the 2–5 keV range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107843
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation between silicon hydride species and the photoluminescence intensity of porous silicon (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1700-1702 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The role of silicon hydride species in the photoluminescence intensity behavior of porous Si has been studied. The surfaces of luminescent porous Si samples were converted to a predominate SiH termination using a remote H plasma. The as-passivated samples were then immersed in various concentrations of hydrofluouric solutions to regulate the recovery of SiH2 termination on the surface. Photoluminescence measurements and transmission Fourier-transform infrared spectroscopy have shown that predominant silicon monohydride (SiH) termination results in weak photoluminescence. In contrast, it has been observed that the appearance of silicon dihydride (SiH2) coincides with an increase in the photoluminescence intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107190
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  • 4
    Electronic Resource
    Electronic Resource
    On the condition of streak formation in a bounded turbulent flow (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 306-320 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Flow between two surfaces at which no-slip and free-slip conditions can be imposed has been investigated numerically with a Fourier–Chebyshev pseudospectral method. Different mean shear rates have been applied to each boundary to study the effect of shear and boundary condition on the streaky structures that have been observed near walls in many previous investigations. In addition to the streaks found near the no-slip wall, the computations also reveal streaky structures when the free-slip surface is under a sufficiently high shear. The low-speed streaks observed near the free-slip surface, although appearing somewhat more pronounced, have much the same characteristics as the wall-layer streaks—e.g., the average spanwise spacing between the streaks both near the wall and the free surface is about 100 when normalized by the kinematic viscosity and the appropriate shear velocity (at the wall or at the free-slip surface). The results show that shear is much more important than the nature of the boundary in determining the dominant flow structure, rather unexpected since vortex lines can attach at a free-slip boundary whereas they cannot at a no-slip one. The formation of streaks appears to be governed by a local nondimensional shear parameter defined as S˜≡S||〈u'w'〉||/ε, where S is the mean shear rate, and 〈u'w'〉 and ε are the kinematic turbulent shear stress and rate of dissipation of turbulent kinetic energy, respectively. It is found that S˜(approximately-equal-to)1.0 is the condition at which the elongated low-speed streaky regions first appear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858306
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  • 5
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    Genetic Study of Five Populations of Bihar, India (1992)
    Baltimore : Periodicals Archive Online (PAO)
    Human Biology. 64:2 (1992:Apr.) 175 
    Details
    ISSN: 0018-7143
    Topics: Biology
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5243-1992-064-02-000005
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  • 6
    Electronic Resource
    Electronic Resource
    Azadirachtin a interferes with control of serotonin pools in the neuroendocrine system of locusts (1992)
    Springer
    Naturwissenschaften 79 (1992), S. 81-84 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131808
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  • 7
    Electronic Resource
    Electronic Resource
    Genetic differentiation among the three Hindu low caste groups of Malda district, West Bengal, India (1992)
    Springer
    International journal of anthropology 7 (1992), S. 7-15 
    Details
    ISSN: 1824-3096
    Keywords: Genetic polymorphism ; three descendants of Koch ; population affinities ; North Bengal ; India
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three descendants of Koch, Indo-Mongolid populations, have been studied for their 12 genetic markers of blood group, red cell enzyme and serum protein. Distribution of their phenotype and allele frequencies shows some variants apart from their common alleles. Analysis on genetic material reveals very low differentiation coefficient (GST) value for the total population, and in the distance measure the Poliya and the Tiyor stand close to each other compared to other populations. Data on ethnohistory of the peoples have been discussed in the light of the results obtained from genetic analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02445037
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  • 8
    Electronic Resource
    Electronic Resource
    Bianchi VI cosmological models representing perfect fluid and radiation with electric-type free gravitational fields (1992)
    Springer
    General relativity and gravitation 24 (1992), S. 1117-1124 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A homogeneous Bianchi type VIh cosmological model filled with perfect fluid, null electromagnetic field and streaming neutrinos is obtained for which the free gravitational field is of the electric type. The barotropic equation of statep = (γ−1)ɛ is imposed in the particular case of Bianchi VI0 string models. Various physical and kinematical properties of the models are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00756987
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of a poly(terephthaloylphosphine) (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 199 (1992), S. 1-6 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(phenylphosphindiylterephthaloyl), ein neues phosphorhaltiges Polymeres, wurde durch Lösungspolykondensation von Dilithium(phenyl)phosphin mit Terephthaloylchlorid bei niedriger Temperatur hergestellt. Es ist in polaren aprotischen Lösungsmitteln löslich; die inhärente Viskosität in DMF bei 30°C beträgt 19 ml/g. Das Polymere wurde mittels Elementaranalyse sowie IR- und 1H-NMR-Spektroskopie charakterisiert. TGA-Messungen ergeben, daß das Polymere in Luft bis 250°C stabil ist; es ist selbstverlöschend.
    Notes: Poly(phenylphosphinediylterephthaloyl), a novel phosphorus-containing polymer, was synthesized by low-temperature solution polycondensation of dilithio(phenyl)-phosphine with terephthaloyl chloride. The resulting polymer is soluble in polar aprotic solvents, having inherent viscosity of 19 ml/g in DMF at 30°C. The polymer was characterized by elemental analysis, IR and 1H-NMR spectroscopy. TGA data show that the polymer is stable up to 250°C in air. The polymer was found to be self-extinguishing.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051990101
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