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  • 2000-2004  (16)
  • 1985-1989  (89)
  • 1
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    Columba - A Database of Annotations of Protein Structure (2003)
    Details
    Publikationsdatum: 2021-01-21
    Sprache: Englisch
    Materialart: conferenceobject , doc-type:conferenceObject
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    OPUS
  • 2
    Digitale Medien
    Digitale Medien
    Order parameter and packing studies in nematic and smectic A phases by x-ray diffraction (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3317-3322 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: X-ray diffraction measurements have been made on the nematic phase of T15 (4-cyano-4'-n-pentyl-p-terphenyl), as well as on the nematic and smectic A phases of RNO2 [4'-nitrophenyl-4-(4'-n-hexyloxy-benzoyloxy)-cinnamate]. The x-ray equipment used allows comparably high resolution measurements of liquid crystals. The inner reflexes show that both compounds possess a bilayer structure supposed as overlapping of polar cyano or nitro group of one molecule and the phenyl ring of the neighboring molecule. The molecular orientational distribution function f (β) has been calculated on the basis of intensity simulations of the outer reflexes. The orientational order parameter P2(cos β), P4(cos β), 〈P2〉 and 〈P4〉 have been determined from f (β). A strong decrease of 〈P2〉 and 〈P4〉 is observed at the smectic A–nematic phase transition temperature of RNO2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.454939
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  • 3
    Digitale Medien
    Digitale Medien
    The interaction of the solar wind and stellar winds with the partially ionized interstellar medium : The 42nd annual meeting of the division of plasma physics of the American Physical Society and the 10th international congress on plasma physics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 2385-2393 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Plasmas in the laboratory and interstellar and interplanetary space are frequently partially ionized. Thus, the solar wind and stellar winds often interact with an interplanetary medium that is an admixture of protons, electrons, other charged ions, and neutral atoms. For example, the very local interstellar medium surrounding our heliosphere may be less than 50% ionized, with the dominant constituent being neutral hydrogen (H). As a result, the composition of the solar wind in the outer heliosphere beyond some 10–15 AU is dominated by neutral interstellar H. Our understanding of the complex physics describing the interaction of the solar wind with the partially ionized local interstellar medium (ISM) has advanced significantly in the last 5 years with the development of very sophisticated models which treat the coupling of neutral atoms and plasma self-consistently. A number of major predictions have emerged from these models, such as the existence of a large wall of heated neutral hydrogen upstream of the heliosphere. Remarkably, in the ensuing years, this prediction has been confirmed by high-resolution Hubble Space Telescope Lyman-α spectroscopic data. Subsequent models now consider the interaction of various stellar winds with the ISM, and Hubble observations provide supporting data. An introductory review of the basic physics, and associated observations, of the interaction of the solar wind and stellar winds with the interstellar medium is presented for this exciting and rapidly developing field. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1345502
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  • 4
    Digitale Medien
    Digitale Medien
    Photoluminescence of neodymium-implanted gallium phosphide and gallium arsenide (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 2210-2212 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Characteristic intra 4f-shell luminescence spectra of Nd3+(4f3) have been observed from neodymium-implanted gallium phosphide and gallium arsenide. The luminescent centers were found to occupy different types of noncubic lattice sites, presumably formed by association of the neodymium implants with radiation damage centers. The relative intensities of the neodymium luminescent centers were found to depend critically on the conditions of postimplantation thermal annealing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.336360
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  • 5
    Digitale Medien
    Digitale Medien
    Photoluminescence excitation measurements on GaAs:Er grown by molecular-beam epitaxy (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4877-4879 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Using a tunable color center laser, photoluminescence excitation measurements were performed on GaAs:Er grown by molecular-beam epitaxy. These measurements show that only one type of Er3+ center is responsible for the sharply structured emission band at 1.54 μm. The multiplicity of the zero-phonon lines indicates that this Er3+ center has lower than cubic symmetry and that the luminescence arises from the intracenter transition 4I13/2→4I15/2 of Er3+ (4f 11).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.338353
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  • 6
    Digitale Medien
    Digitale Medien
    Neodymium complexes in GaP separated by photoluminescence excitation spectroscopy (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 1202-1204 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Implantation of neodymium (Nd) in GaP gives rise to a very complex spectrum of intra 4f-shell luminescence transitions involving a number of Nd defect associates. Using a tunable color center laser, photoluminescence excitation spectroscopy was employed to separate different Nd3+ complexes in GaP:Nd. Two dominant noncubic Nd centers are clearly identified which arise presumably from the association of Nd with radiation damage centers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.336558
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  • 7
    Digitale Medien
    Digitale Medien
    Intrathecal Baclofen in Tetanus (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 531 (1988), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1988.tb31823.x
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  • 8
    Digitale Medien
    Digitale Medien
    An apparatus for the measurement of the gas permeability of foam films (2002)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 398-403 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A device is described which allows the measurement of the gas permeability of a single foam film upon variation of its thickness and specific interaction film free energy. A variable external pressure is applied on the film, which results in corresponding variations of the film thickness and the specific interaction film free energy. The apparatus allows the gas permeability of foam films to be investigated at different desired values of these quantities. The method can be used to gain information about the structure of the foam film. Small changes in the adsorption density in the stabilizing surfactant monolayers of the film result in dramatic changes of the permeability. Therefore measurements of the permeability coefficient may be used as a tool to detect variations in composition and structure of the film monolayers. This apparatus will also be extremely useful for the study of the permeation of pure gases and vapors and of gas separation by foam films for purposes of chemical technology or medicine. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1427305
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  • 9
    Digitale Medien
    Digitale Medien
    Kinetic oscillations in the catalytic CO oxidation on Pt(100): Theory (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 1578-1587 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Experimental investigations on the catalytic oxidation of CO on well-defined Pt(100) surfaces at low pressures (∼10−4 Torr) revealed under certain conditions the occurrence of kinetic oscillations which were associated with periodic transformations of the surface structure propagating wave-like across the surface area. Based on experimental information about the various elementary steps involved (adsorption, desorption, surface reaction, adsorbate-induced surface structural transformation) a set of coupled differential equations describing the kinetics of the various processes was established. A simplified version of these equations allows analytical treatment and provides qualitative insight into the occurrence of oscillations through linear stability analysis. Numerical solution of the full set of reaction-diffusion equations reproduces the essential spatio-temporal features of the experimental observations, although full quantitative agreement would still require better adjustment of the parameters involved as well as further refinement of the model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.449834
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  • 10
    Digitale Medien
    Digitale Medien
    Growth pattern of diploid and tetraploid spotted knapweed, Centaurea maculosa Lam. (Compositae), and effects of the root-mining moth Agapeta zoegana (L.) (Lep.: Cochylidae) (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 29 (1989), S. 0 
    Details
    ISSN: 1365-3180
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Glass-faced growth containers were used to study the phenology of three demes of Centaurea maculosa Lam. (Compositae), and the impact of root-mining by the moth Agapeta zoegana (L.) (Lep.: Cochylidae) on rooting intensity. This moth was recently established in North America for the biological control of spotted and diffuse knapweed, C. maculosa and C. diffusa. The life cycle, biomass production and longevity of the diploid European host plant (monocarpic biennial) and the tetraploid North American target species (polycarpic perennial) differed considerably, providing a possible explanation for the rapid spread of the tetraploid species in North America. Compared to controls, plants of German and Canadian origin infested by A. zoegana showed increased root growth during the mining period and after the emergence of the moths. However, no such difference was found in diploid plants of Hungarian origin. The observed plant reactions partly support, therefore, the hypothesis of a nutritionally controlled response to herbivory. Infested plants did not differ in fecundity compared to controls, but root-mining tends to reduce the survival rate of immature plants The consequences for the plant population density are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3180.1989.tb00847.x
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