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  • 1
    Digitale Medien
    Digitale Medien
    Hydrogen surface coverage: Raising the silicon epitaxial growth temperature (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2017-2019 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The chemisorption of molecular hydrogen onto the Si (100) surface is shown to disrupt the epitaxial growth of silicon and silicon/germanium alloys grown by molecular beam epitaxy. It is only after the substrate temperature is raised above the hydrogen desorption temperature, or the deposition rate is lowered, that high quality single-crystal films can be grown. The results also suggest the surface segregation of hydrogen during growth.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.102149
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  • 2
    Digitale Medien
    Digitale Medien
    Hydrogen incorporation in undoped microcrystalline silicon (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1626-1628 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Hydrogen in undoped, unalloyed microcrystalline silicon (μc-Si:H) has been investigated with secondary-ion mass spectrometry (SIMS), Raman spectroscopy, infrared absorption spectroscopy, and nuclear magnetic resonance (NMR). The samples were grown by plasma-enhanced chemical vapor deposition with hydrogen to silane dilution ratios (H2:SiH4) ranging from 0:1 to 98:1. Microcrystallinity is obtained for dilution ratios of 20:1 and greater. The hydrogen concentration is shown to depend nonmonotonically on the degree of hydrogen dilution. The H concentration in the films decreases with dilution for ratios from 0:1 to 10:1 and then increases with greater dilution. This dependence on dilution is established with both NMR and SIMS and suggests the existence of competing processes in the incorporation of hydrogen during deposition. It is further observed that the formation of microcrystallites is accompanied by the appearance of both higher order silicon hydrides and large concentrations of unbound molecular hydrogen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.99932
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  • 3
    Digitale Medien
    Digitale Medien
    Preparation of highly photosensitive hydrogenated amorphous Si-C alloys from a glow-discharge plasma (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 4025-4027 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The preparation conditions for the deposition of hydrogenated amorphous silicon-carbon alloys (a-SiC:H) from a glow-discharge plasma have been systematically scanned by changing the starting-gas materials as well as the starting gas to hydrogen dilution ratio. A highly photosensitive alloy showing a photoconductivity to dark conductivity ratio of 107 at a band gap of 2.0 eV was prepared under optimized conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.337528
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  • 4
    Digitale Medien
    Digitale Medien
    Photochemistry of 4,4-dimethyl-1-mesityl-2-pentyn-1-one (1987)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 109 (1987), S. 3050-3057 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00244a030
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  • 5
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    Antisocial conduct: whose concern? (1987)
    London : Periodicals Archive Online (PAO)
    Journal of adolescence. 10:2 (1987:June) 105 
    Details
    ISSN: 0140-1971
    Thema: Psychologie
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:d137-1987-010-02-000001
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  • 6
    Digitale Medien
    Digitale Medien
    The pattern of restriction enzyme-induced banding in the chromosomes of chimpanzee, gorilla, and orangutan and its evolutionary significance (1985)
    Springer
    Journal of molecular evolution 22 (1985), S. 323-333 
    Details
    ISSN: 1432-1432
    Schlagwort(e): Pongidae ; Chromosome ; Karyotype ; Restriction enzymes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The pattern of banding induced by five restriction enzymes in the chromosome complement of chimpanzee, gorilla, and orangutan is described and compared with that of humans. The G banding pattern induced by Hae III was the only feature common to the four species. Although hominid species show almost complete chromosomal homology, the restriction enzyme C banding pattern differed among the species studied. Hinf I did not induce banding in chimpanzee chromosomes, and Rsa I did not elicit banding in chimpanzee and orangutan chromosomes. Equivalent amounts of similar satellite DNA fractions located in homologous chromosomes from different species or in nonhomologous chromosomes from the same species showed different banding patterns with identical restriction enzymes. The great variability in frequency of restriction sites observed between homologous chromosome regions may have resulted from the divergence of primordial sequences changing the frequency of restriction sites for each species and for each chromosomal pair. A total of 30 patterns of banding were found informative for analysis of the hominid geneaalogical tree. Using the principle of maximum parsimony, our data support a branching order in which the chimpanzee is more closely related to the gorilla than to the human.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02115688
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  • 7
    Digitale Medien
    Digitale Medien
    In vitro pharmacodynamic evaluation of VP-16-213 and implications for chemotherapy (1987)
    Springer
    Cancer chemotherapy and pharmacology 19 (1987), S. 246-249 
    Details
    ISSN: 1432-0843
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary VP-16-213 (Etoposide) is an active antineoplastic agent which has undergone extensive evaluation of clinical dose escalation. To corroborate a putative dose-response relationship, we studied, in a modified clonogenic assay, various doses and durations of exposure. VP-16-213 at doses of 0.01, 0.05, 0.10, 0.50, 1.0, 5.0 and 10.0 μg/ml, each with exposure durations of 1, 3, 18, and 30 h, was studied in vitro against two human tumor cell lines, MOLT and 9812. The doses and durations of exposure were chosen to approximate some of the pharmacokinetic values achievable in either standard-dose or high-dose clinical studies. The results, summarized as linear regression lines, demonstrate with statistical significance (p〈0.03) that there is correlation between dose and cytotoxicity and between dose x duration of exposure (representing the area under the concentration-time curve) and cytotoxicity. Our in vitro data thus support the concept of intensive use of VP-16-213 to maximize antitumor activity. However, how best to accomplish the manipulation of dose and duration of exposure is not yet clear and will be the subject of future clinical investigations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00252980
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  • 8
    Digitale Medien
    Digitale Medien
    Large deformation in filled networks of different architecture and its interpretation in terms of the van der Waals network model (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 410-423 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Silica loadedrubber ; filler tomatrix contact modification ; simpleextension ; van der Waals approach ; deformation mechanism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract The first quasi-static stretch of the two limiting systems of filler loaded rubber have been investigated. One of them is found by filler to matrix contacts only, the other by crosslinking permanently the matrix. In this case filler-matrix contacts are made by adhesion. The experimental results were described in terms of an extended van der Waals approach. It is illuminated that different filler to matrix contact (permanent bonds or adhesion) lead to different deformation mechanism, substantially affecting the “reinforcement”. Moreover, filler induced local “field-modifications” due to the boundary value problem can be understood with the Einstein-Smallwood approach independent of the kind of the filler to matrix contacts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01412219
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