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  • 1
    Electronic Resource
    Electronic Resource
    Generalized brillouin theorem multiconfiguration method for excited states (1977)
    Springer
    Theoretical chemistry accounts 44 (1977), S. 45-59 
    Details
    ISSN: 1432-2234
    Keywords: MC method ; Excited states ; core hole states ; Carbon ; Lithium ; Water ; Formaldehyde
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The Generalized Brillouin Theorem Multiconfiguration Method (GBT-MC) of Grein and Chang is extended and applied to the calculation of excited states. Orthogonality constraints to lower states as well as second-order interaction effects of states lying close together have been taken into account. In this way quadratic convergence can be guaranteed. Difficulties with coupling coefficients and Lagrangian multipliers of SCF methods can be circumvented. Test calculations have been performed on valence electron excited states of C, H2O, and CH2O, and on core excited states of Li.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00548028
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    Paper (German National Licenses)
    Fulltext
  • 2
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    A planetary radio astronomy discussion of the 1.55 cm microwave emission of the earth (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Using 1.55 cm observations of the earth made by the Electrically Scanned Microwave Radiometer (ESMR) experiment on Nimbus 5, the appearance of the earth from Venus is simulated. A single antenna unable to resolve the earth's disk would give a time-averaged disk temperature of 183 K. In one rotation, the disk temperature would vary from 194 K to 172 K. During the 1973 inferior conjunction, a radio telescope with 1 arc sec resolution would resolve most of the major surface features of the earth.
    Keywords: GEOPHYSICS
    Type: Icarus; 24; Feb. 197
    Format: text
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  • 3
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    A radio picture of the earth (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A technique called passive microwave remote sensing can be used to obtain a new view of the planet earth by means of radio telescopes carried aboard artificial satellites. An important relationship between the observed radio brightness temperature and the surface conditions provides the basis for the new technique. A radio image is presented of the entire earth on the basis of Nimbus microwave-image data taken January 12-16, 1973.
    Keywords: GEOPHYSICS
    Type: Sky and Telescope; 49; Jan. 197
    Format: text
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  • 4
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    Polar sea ice observations by means of microwave radiometry (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Principles pertinent to the utilization of 1.55 cm wavelength radiation emanating from the surface of the earth for studying the changing characteristics of polar sea ice are briefly reviewed. Recent data obtained at that wavelength with an imaging radiometer on-board the Nimbus 5 satellite are used to illustrate how the seasonal changes in extent of sea ice in both polar regions may be monitored free of atmospheric interference. Within a season, changes in the compactness of the sea ice are also observed from the satellite. Some substantial areas of the Arctic sea ice canopy identified as first-year ice in the past winter were observed not to melt this summer, a graphic illustration of the eventual formation of multiyear ice in the Arctic. Finally, the microwave emissivity of some of the multiyear ice areas near the North Pole was found to increase significantly in the summer, probably due to liquid water content in the firm layer.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-70529 , X-652-73-341 , Interdisciplinary Symp. on Advanced Concepts and Techniques in the Study of Snow and Ice Resources
    Format: application/pdf
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  • 5
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    Microwave maps of the polar ice of the earth (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Synoptic views of the entire polar regions of earth were obtained free of the usual persistent cloud cover using a scanning microwave radiometer operating at a wavelength of 1.55 cm on board the Nimbus-5 satellite. Three different views at each pole are presented utilizing data obtained at approximately one-month intervals during the winter of 1972-1973. The major discoveries resulting from an analysis of these data are as follows: (1) Large discrepancies exist between the climatic norm ice cover depicted in various atlases and the actual extent of the canopies. (2) The distribution of multiyear ice in the north polar region is markedly different from that predicted by existing ice dynamics models. (3) Irregularities in the edge of the Antarctic sea ice pack occur that have neither been observed previously nor anticipated. (4) The brightness temperatures of the Greenland and Antarctica glaciers show interesting contours probably related to the ice and snow morphologic structure.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-70493 , X-652-73-269
    Format: application/pdf
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  • 6
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    Results of the US contribution to the joint US/USSR Bering Sea experiment (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The atmospheric circulation which occurred during the Bering Sea Experiment, 15 February to 10 March 1973, in and around the experiment area is analyzed and related to the macroscale morphology and dynamics of the sea ice cover. The ice cover was very complex in structure, being made up of five ice types, and underwent strong dynamic activity. Synoptic analyses show that an optimum variety of weather situations occurred during the experiment: an initial strong anticyclonic period (6 days), followed by a period of strong cyclonic activity (6 days), followed by weak anticyclonic activity (3 days), and finally a period of weak cyclonic activity (4 days). The data of the mesoscale test areas observed on the four sea ice option flights, and ship weather, and drift data give a detailed description of mesoscale ice dynamics which correlates well with the macroscale view: anticyclonic activity advects the ice southward with strong ice divergence and a regular lead and polynya pattern; cyclonic activity advects the ice northward with ice convergence, or slight divergence, and a random lead and polynya pattern.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-70648 , X-910-74-141
    Format: application/pdf
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  • 7
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    Electron Heating Processes in the Middle Ionosphere (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Equilibrium distribution functions for electrons in ionospheric plasma calculated for energy interval of 0 to 15 eV utilization data collected in pulse probe experiment
    Keywords: GEOPHYSICS
    Type: NASA-CR-119031 , TR-71-009
    Format: application/pdf
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