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  • 1995-1999  (27)
  • 1980-1984  (19)
  • 1950-1954  (5)
  • 1
    Digitale Medien
    Digitale Medien
    Ultrafast optical switching of second-harmonic generation at the C60 single-crystal surface (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3781-3783 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The switching of second-harmonic generation (SHG) at a C60 single-crystal surface has been observed in a pump-and-probe experiment. The SHG signal from a picosecond 1.17 eV laser pulse is suppressed by one order of magnitude upon illuminating the crystal surface with a 3.49 eV pump pulse. The nonlinear optical response is faster than 45 ps and persists for longer than 20 ns. SHG suppression to 1/e occurs at pump densities as low as 2.8 μJ/cm2. We suggest that nonlocalized excited electronic states determine the change in the nonlinear optical behavior. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.361213
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  • 2
    Digitale Medien
    Digitale Medien
    Schottky barrier and interface formation of metal–GaTe(001) interfaces (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 1990-1993 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We studied the deposition of Au, In, Ag, and Al overlayers onto clean-cleaved GaTe(001) surfaces at room temperature by x-ray photoelectron spectroscopy. Gold and In overlayers did not produce evidence of chemical reactions, and neither with cation nor anion outdiffusion. Gold overlayers exhibited no evidence of island formation and a layer-by-layer overlayer coverage. The deposition of In revealed the presence of clustering for a metal thickness higher than 6 Å. On the other hand, the deposition of Al lead to an exchange reaction with a metalliclike Ga phase separation. Core level analysis of the Ag–GaTe interface revealed no noticeable change of the shape of the peaks. The dependence of the peak intensities on overlayer thickness showed an initial layer-by-layer coverage until 1.8 Å, followed by a clustering growth mode. From about 3.7 Å Ag thickness, significant Te outdiffusion was observed. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.368332
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  • 3
    Digitale Medien
    Digitale Medien
    Environmentally compatible surfactants for the cosmetic industry (1997)
    Oxford, UK : Chapman and Hall
    International journal of cosmetic science 19 (1997), S. 0 
    Details
    ISSN: 1468-2494
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: From the application pattern of surfactant-containing cosmetic products, it is inevitable that the major part of the chemicals will be discharged into waste water and eventually will enter the environment. Because the environmental compatibility of the products is based on the ecological properties of their raw meterials, the biodegradability and ecotoxicological behaviour of the product components and particularly the surfactants, form the central elements of the environmental compatibility assessment. The tools for this evaluation are standardized test systems, which are described and discussed on the basis of the ecological data of selected surfactants. De par le type d'application des produits cosmetiques contenant des tensioactifs, il est inevitable que la plus grande partie des substances chimiques soit evacuee dans les eaux usees et finisse par arriver dans l'environnement. Puisque la compatibilite environnementale des produits est basee sur les proprietes ecologiques de leurs matieres premieres, la biodegradabilite et le comportement ecotoxicologique des composants des produits, et en particulier des tensioactifs, forment les elements majeurs de l'evaluation de la compatibilite environnementale. Les outils de cette evaluation sont des systemes d'essai normalises, qui sont decrits et commentes d'apres les donnees ecologiques de tensioactifs choisis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1467-2494.1997.tb00186.x
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  • 4
    Digitale Medien
    Digitale Medien
    Band discontinuity fluctuations and local chemistry at the GaSe–Si interface (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1859-1861 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Photoemission spectromicroscopy data on Si–GaSe with 0.2 μm lateral resolution revealed laterally inhomogeneous interface Se–Si chemical reactions. The local Si 2p fits agrees with interface Si selenide parameters; the Se 3d peaks indicate a Si–selenide component; the Ga 3d peaks exhibit a metallic component whose intensity increases with Si coverage. This local interface reaction is related to lateral changes in the band lineup. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.122306
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  • 5
    Digitale Medien
    Digitale Medien
    Chemical inhomogeneity and reactions of BiSrCaCuO surfaces detected by synchrotron imaging spectromicroscopy (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2924-2926 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A microscopic chemical analysis of BiSrCaCuO (BSCCO) 2212 single crystals was performed with an unprecedented combination of high (submicron) lateral resolution and high energy resolution (100 meV or better). These performances, achieved with imaging synchrotron spectromicroscopy, enabled us to detect in a very small fraction of the investigated specimens, morphological and chemical inhomogeneities. Specifically, we found deviations from stoichiometry in the surface Sr content which have a subtle effect on the chemical environment of at least one other element, Ca. The different chemical environment was found to influence surface chemical reactions. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.117325
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  • 6
    Digitale Medien
    Digitale Medien
    Cell renewal, cell differentiation and programmed cell death (apoptosis) in pilomatrixoma (1997)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 137 (1997), S. 0 
    Details
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Summary Pilomatrixoma is a benign tumour of the cutaneous adnexa. Histologically. pilomatrixoma comprises masses of immature basophilic cells, small numbers of polygonal squamoid cells, few transitional cells, and clusters of ‘shadow cells’. The mechanism leading to the formation of shadow cells is still unknown. Skin biopsy specimens of pilomatrixoma (n= 15) were studied histologically, immuno-hislologically, and by applying the in situ end-labelling technique. The basal layer of the basophilic cells included most of the proliferating cells with high expression of bcl-2 and cytokeratin 19. The overlying basophilic cells showed a negligible mitotic activity, a high significant accumulation of p53 protein, and a heterogeneous, but progressive loss of bcl-2 and cytokeratin 19. They developed either into squamoid cells or into transitional cells. The squamoid cells were characterized as differentiated cells resembling mature keratinocytes of stratified mucosa. The transitional cells could be shown to represent apoptotic cells proceeding to shadow cells. The data suggest that apoptosis is the main mechanism leading to the development of the dead shadow cells and is most probably responsible for the banal biological behaviour of pilomatrixoma. Apart from that, pilomatrixoma represents a suitable biological model to study apoptosis in humans.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2133.1997.19412056.x
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  • 7
    Digitale Medien
    Digitale Medien
    Investigations of pure rotational transitions of H2 self-perturbed and perturbed by He. I. Measurement, modeling, and quantum calculations (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 951-961 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: High resolution stimulated gain Raman spectroscopy is used to investigate the collisional parameters of pure rotational S0(j=0–4) lines of H2 in pure H2 and H2–He mixture. Measurements are performed between 300 and 1000 K in a density regime where the lines are essentially collisionally broadened (typically 10 amagat). For the first time, these highly accurate measurements of the frequencies of pure rotational lines allow one to correct previously measured values that did not take into account the collisional frequency shift. For both collisional systems, the shifting coefficients exhibit a linear behavior with the square root of temperature, similar to the behavior already observed in the Q branch. The broadening coefficients of the S0 branch increase nonlinearly with temperature contrary to the Q branch. For the H2–He system, both these new S0(j) data and previously measured Q(j) data are analyzed using a modeling of the broadening coefficients in terms of elastic and inelastic contributions. These different contributions are analyzed as a function of temperature and of the rotational quantum number j. Preliminary quantum calculations are used to assess the validity of the model. Further calculations will be presented in paper II. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.476638
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  • 8
    Digitale Medien
    Digitale Medien
    Inhomogeneous and thickness-dependent chemical reactivity at GaSe–Si interfaces (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 7694-7696 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Scanning photoelectron spectromicroscopy experiments on the edge of patterned Si overlayers on GaSe revealed the presence of an inhomogeneous reaction with a metallic-like Ga phase separation. The Si–Se chemically shifted components show lateral variations and a thickness-related SiSe2/SiSex (x=0.5, 1, and 1.5) ratio on a micrometer scale. The dependence of the peak intensities on the overlayer thickness suggests an initial layer-by-layer coverage until (approximate)2 Å, followed by a clustering growth mode. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.370573
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  • 9
    facet.materialart.
    Unbekannt
    Waldschmidt, E.: Sanskrit-Wörterbuch der buddhistischen Texte aus den Turfan-Funden. Lfg. 1 u. 2, bearb. von G. von Simson (Book Review) (1981)
    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 76:5 (1981:Sept./Okt.) 496 
    Details
    ISSN: 0030-5383
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen , Ethnologie , Geschichte
    Notizen: Besprechungen
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4148-1981-076-05-000046
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  • 10
    Digitale Medien
    Digitale Medien
    Re6Se7Br4 (1997)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 1178-1180 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270197004666
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