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  • METEOROLOGY AND CLIMATOLOGY  (5)
  • Nuclear Reactions  (2)
  • 33.50.Hv  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Level investigation by means of the (d, α) reaction (II). ^5^2Mn and ^5^6Mn
    Amsterdam : Elsevier
    Nuclear Physics, Section A 183 (1972), S. 509-522 
    Details
    ISSN: 0375-9474
    Keywords: Nuclear Reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(72)90353-3
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    From torsional spectra to Hamiltonians and dynamics: effects of coupled bright and dark states of 9-(N-carbazolyl)-anthracene (1995)
    Springer
    The European physical journal 34 (1995), S. 111-118 
    Details
    ISSN: 1434-6079
    Keywords: 33.10.-n ; 33.50.Hv ; 33.80.Be
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The torsional dynamics of the 9-(N-carbazolyl)-anthracene (C9A) molecule is investigated by means of time-independent (1) and time-dependent (2) quantum-mechanical simulations in a diabatic representation. The study includes effects of surface crossing of the brightS 1 state with a dark state. (1) The intensity pattern of theS 0 →S 1 fluorescence excitation spectrum is used to fit an effective one-dimensional Hamiltonian with a single-minimum potential for the dark state together with diabatic couplings to the double well potential of the bright state. (2) Based on this Hamiltonian, first predictions for a pump-probe scheme are made. In the pump process the molecules are excited to theS 1 state followed by competing torsions in the bright state and diabatic curve crossings to the dark state, depending on the pump frequency. Assuming the probe process to be an ionization from the bright state, the interfering effects of the dark state on the dynamics in the bright state can be monitored in a directly time-dependent way on a fs-ps time scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439385
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    Paper (German National Licenses)
    Fulltext
  • 3
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    High-precision measurement of total fission cross sections in spallation reactions of ^{208}Pb and ^{238}U (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-03-05
    Description: Author(s): K.-H. Schmidt, B. Jurado, R. Pleskač, M. V. Ricciardi, J. Benlliure, A. Boudard, E. Casarejos, T. Enqvist, F. Farget, A. Bacquias, M. Fernandez, L. Giot, V. Henzl, D. Henzlova, A. Kelić-Heil, T. Kurtukian, S. Leray, S. Lukić, Son Nguyen Ngoc, P. Nadtochy, D. Perez, and C. Schmitt Total cross sections for proton- and deuteron-induced-fission of 208 Pb and 238 U have been determined in the energy range between 500 MeV and 1 GeV. The experiment has been performed in inverse kinematics at GSI Darmstadt, facilitating the counting of the projectiles and the identification of the rea... [Phys. Rev. C 87, 034601] Published Mon Mar 04, 2013
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 4
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    An initialization procedure for assimilating geostationary satellite data into numerical weather prediction models (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An attempt was made to offset the limitations of GEO satellites for supplying timely initialization data for numerical weather prediction models (NWP). The NWP considered combined an isentropic representation of the free atmosphere with a sigma-coordinate model for the lower 200 mb. A flux form of the predictive equations described vertical transport interactions at the boundary of the two model domains, thereby accounting for the poor vertical temperature and wind field resolution of GEO satellite data. A variational analysis approach was employed to insert low resolution satellite-sensed temperature data at varying rates. The model vertical resolution was limited to that available from the satellite. Test simulations demonstrated that accuracy increases with the frequency of data updates, e.g., every 0.5-1 hr. The tests also showed that extensive cloud cover negates the capabilities of IR sensors and that microwave sensors will be needed for temperature estimations for 500-1000 mb levels.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Evaluation of TIROS-N and NOAA-6 satellite data: Comparisons of colocated soundings and analyses for a January case (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An early January 1980 synoptic situation was used in evaluating the performance of TIROS-N and NOAA-6 operational temperature soundings. Visual and statistical comparisons of temperature and thickness fields were employed to determine the effects of manual screening of the satellite soundings and measure the accuracy of both the satellite soundings and analyses derived from them. Comparisons between the performance of TIROS-N and NOAA-6 were emphasized. Both satellites were able to correctly position the major troughs and ridges. Gradients were underestimated though, with troughs markedly too warm and ridges slightly too cold. The poorest data occurred near the surface and tropopause as reflected by larger standard deviations in those layers. The performance of TIROS-N was slightly superior to that of NOAA-6.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Optimum Employment of Satellite Indirect Soundings as Numerical Model Input; p 51-81
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    An evaluation of soundings, analyses and model forecasts derived from TIROS-N and NOAA-6 satellite data (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: TIROS-N and NOAA-6 temperature soundings over North America during three days in January 1980, and synoptic analyses and numerical-model forecasts derived from them, are compared with conventional data and analyses from NMC's limited-area fine-mesh model (LFM). The collocated sounding comparison revealed significant errors, especially near the surface and the tropopause. Satellite-derived thermal gradients were found to be weak, and thickness-analysis difference fields to propagate eastward, suggesting that sounding errors are correlated with synoptic patterns. The same pattern of anomalies is seen in the model forecasts. More detailed determinations of the correlation detected here could be used to optimize the assimilation of satellite soundings to conventional data.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Monthly Weather Review (ISSN 0027-0644); 111; March 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Optimum employment of satellite indirect soundings as numerical model input (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The characteristics of satellite-derived temperature soundings that would significantly affect their use as input for numerical weather prediction models were examined. Independent evaluations of satellite soundings were emphasized to better define error characteristics. Results of a Nimbus-6 sounding study reveal an underestimation of the strength of synoptic scale troughs and ridges, and associated gradients in isobaric height and temperature fields. The most significant errors occurred near the Earth's surface and the tropopause. Soundings from the TIROS-N and NOAA-6 satellites were also evaluated. Results again showed an underestimation of upper level trough amplitudes leading to weaker thermal gradient depictions in satellite-only fields. These errors show a definite correlation to the synoptic flow patterns. In a satellite-only analysis used to initialize a numerical model forecast, it was found that these synoptically correlated errors were retained in the forecast sequence.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-CR-168509
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Simulation experiments for testing the assimilation of geostationary satellite temperature retrievals into a numerical prediction model (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A simulation experiment is presented which tests a procedure that assimilates temperature soundings from geostationary satellites using a method developed by Gal-Chen (1983). The simulation is used to decide whether the increased temporal resolution of geostationary satellite data can be used to improve numerical simulation of a baroclinically unstable wave, and to assess the impact of gaps in the satellite sounding fields on the model simulations. Background information on the simulation experiment is presented, including discussion of the variational approach utilized, the numerical model, updating procedures, and control run. The simulation results indicate that, for the case of a baroclinically unstable wave, considerable improvements in the short-range forecast may be realized if geostationary satellite data are inserted with a frequency near 1 hr during a 6 hr analysis cycle compared with a single insertion.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Monthly Weather Review (ISSN 0027-0644); 114; 1213-123
    Format: text
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    NASA TECHNICAL REPORTS
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