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  • 1
    Electronic Resource
    Electronic Resource
    Ultrafast nonlinear optical response and high density excitation effects of the stacking fault exciton in BiI3 (1991)
    Springer
    Applied physics 53 (1991), S. 480-490 
    Details
    ISSN: 1432-0630
    Keywords: 71.70 Ej ; 71.35 +z ; 73.40 Lq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract On the exciton states localized at a two-dimensional stacking fault interface in a layered crystal BiI3, some nonlinear optical phenomena clearly appear reflecting large transition probability. The optical Stark shift and other high density exciton effect on the energy-shift and the spectral broadening are observed with clear separation under intense laser pumping by time-resolved measurements. The optical Stark shift is analyzed based on the dressed exciton model. The ultrafast optical response faster than 3 ps for the pump-laser field is confirmed on the Stark shift. Degenerate four-wave-mixing signals show fairly long dephasing time of ∼40 ps in this system. The dephasing probability depends linearly on the pump-laser intensity in the same manner as that of the spectral line-broadening reflecting the relaxation process. The dephasing mechanisms are understood by the exciton scattering at high density in parallel with the spectral changes. The blue-shift due to the high density excitons are discussed on the basis of exciton-exciton interaction in connection with a phase-space filling theory in two-dimensional systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331537
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hybrid finite analytic solutions of shallow water circulation (2003)
    Springer
    Applied mathematics and mechanics 24 (2003), S. 1081-1088 
    Details
    ISSN: 1573-2754
    Keywords: tidal flow ; wind stress ; circulation ; shallow water ; seiche ; hybrid finite analytic method ; density gradient ; P731.2 ; 76M10 ; 76M99
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract The hybrid finite analytic (HFA) method is a kind of numerical scheme in rectangular element. In order to simulate the shallow circulation in irregular bathymetry by HFA scheme, the model in sigma coordinate system was obtained. The model has been tested against three cases: 1) Wind induced circulation; 2) Density driven circulation and 3) Seiche oscillation. The results obtained in the present study compare well with those obtained from the corresponding analytical solutions under idealized for the above three cases. The hybrid finite analytic method and the circulation model in sigma coordinate system can be used calculate the flow and water quality in estuaries and coastal waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02437640
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    Paper (German National Licenses)
    Fulltext
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