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  • 1
    Schriftenreihen ausleihbar
    Schriftenreihen ausleihbar
    Leidy Formation : new name for a Pleistocene glacio-fluviatile-lacustrine sequence in northwestern Wyoming (1994)
    Washington, DC : United States Gov. Print. Off.
    Dazugehörige Bände
    Details Verfügbarkeit
    Signatur: SR 90.0002(932-D)
    In: Professional paper
    Materialart: Schriftenreihen ausleihbar
    Seiten: III, D-13 S.
    Serie: U.S. Geological Survey professional paper 932-D
    Sprache: Englisch
    Standort: Kompaktmagazin unten
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The interaction between H and CO coadsorbed on Ni{110} (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 8789-8797 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: CO adsorption on Ni{110} and on hydrogen precovered Ni{110} surfaces at 180 K has been studied by FT-RAIRS. On a clean Ni{110} surface CO adsorbs at on-top sites upto a coverage of 0.7 ML. At higher coverages the on-top CO band at 2060 cm−1 decreases in intensity with a concomitant increase in a band at 1960 cm−1 which shifts up in frequency. The (2×1)p2mg structure at 1.0 ML CO coverage shows a single band at 1998 cm−1 attributed to CO tilted at bridged sites. FT-RAIRS of CO adsorption on H precovered Ni{110} surfaces shows complex CO site switching within different CO and H coverage regimes. A model is presented involving compression of H into islands of high coverage and both mixed H and CO and unmixed CO islands are formed. CO adsorbs in the unmixed CO islands the same as that on clean Ni{110}. Within the mixed H/CO islands the first layer nickel atoms reconstruct and a new hydrogen desorption state is observed. The CO site switching observed by FT-RAIRS within the various H and CO coverage regimes is discussed in terms of a dominant indirect interaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.463348
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Erratum: The interaction between H and CO coadsorbed on Ni{110} [J. Chem. Phys. 97, 8789 (1992)] (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 10106-10106 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.465123
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Phase plane method for deconvolution of luminescence decay data with a scattered-light component (1984)
    s.l. : American Chemical Society
    Analytical chemistry 56 (1984), S. 82-85 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00265a023
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  • 5
    Digitale Medien
    Digitale Medien
    A numerical technique for solving the scalar wave equation for Gaussian and smoothed-out profiles (1981)
    Springer
    Optical and quantum electronics 13 (1981), S. 217-224 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A numerical technique, based on transforming the scalar wave equation to a finite interval before discretization is applied, is proposed for the solution of the scalar wave equation defining the modal fields and propagation constants of optical fibres. It is used to compute the propagation constants and modal fields of weakly guiding fibres of circular cross-section when the refractive index profile has a Gaussian or smoothed-out form. The smoothed-out profiles are studied because they vary continuously from the Gaussian to the step profile. Results are compared with and shown to be accurately approximated by simply explicit functions, dependent only on the fibre parameter.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620324
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  • 6
    Digitale Medien
    Digitale Medien
    Variational approximations for higher-order modes of weakly-guiding fibres (1984)
    Springer
    Optical and quantum electronics 16 (1984), S. 41-48 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Simple approximations for the fields and propagation constants of low-order modes on circular weakly guiding fibres are derived using variational techniques. The high accuracy of these approximations for quasi-parabolic profiles is demonstrated in the case of the Gaussian profile, for which there are no analytical solutions of the scalar wave equation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619876
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  • 7
    Digitale Medien
    Digitale Medien
    Anomalous loss in depressed-cladding and W-fibres (1993)
    Springer
    Optical and quantum electronics 25 (1993), S. 409-416 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Anomolous spikes in the loss spectrum of practical depressed-cladding fibres with a finite cladding and absorbing jacket can be explained in terms of a combination of three effects — the excitation conditions, the absorption behaviour of core and cladding modes, and the slight variation in the fibre diameter along its length.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00420582
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  • 8
    Digitale Medien
    Digitale Medien
    Optimum design of adiabatic weakly guiding nonlinear optical fibre tapers (1991)
    Springer
    Optical and quantum electronics 23 (1991), S. 1179-1188 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract We investigated the design features of adiabatic, weakly guiding optical fibre tapers for nonlinear device applications. In general, where the fibre taper ‘core’ and ‘cladding’ are of different material nonlinearities, the nonlinear effects that can be achieved depend critically on the taper parameters. For optical switches a suitable choice of taper parameters minimizes the power × length product for nonlinear operation. The maximum effective utilization of the nonlinear cladding material was found to be 21.3%. Also, nonlinear effects can be totally suppressed with an appropriate choice of design, enabling nonlinear effects that are undesirable in some applications to be avoided.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619986
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  • 9
    Digitale Medien
    Digitale Medien
    X-junctions in buried channel waveguides (1992)
    Springer
    Optical and quantum electronics 24 (1992), S. 1373-1379 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The excess loss across an acute-angle symmetric X-junction composed of two weakly guiding single-mode buried channel waveguides of square core cross-section is shown to be very small provided the junction angle is greater than a few degrees. Numerical and approximate analytical results are presented, as well as a simple criterion for the onset of cross-talk as the junction angle decreases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00625813
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  • 10
    Digitale Medien
    Digitale Medien
    Splice loss in single- and twin-core buried channel waveguide devices (1994)
    Springer
    Optical and quantum electronics 26 (1994), S. 45-62 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract We quantify the magnitude of the power loss incurred when a square-core buried channel waveguide (BCW) is spliced to a standard circular-core telecommunications fibre. With a view to minimizing the dissipated power, we show that a simple equal-core-area criterion provides an elegant means of determining the optimum core dimensions. This result is found to hold for more general BCW cross-sections that possess a reasonable degree of symmetry. The fundamental problems of waveguide misalignment and angular tilt are also investigated and their effect on splice loss is quantified. Our theoretical model is applied to both single- and twin-core waveguides.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00573900
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