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  • METEOROLOGY AND CLIMATOLOGY  (10)
  • Chemical Engineering  (2)
  • Analytical Chemistry and Spectroscopy  (1)
  • Atomic, Molecular and Optical Physics
  • 1990-1994  (14)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Novel liquid-in-pore configurations in membrane solvent extraction (1990)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 36 (1990), S. 1592-1596 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690361018
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Metals sorption by chelating polymers: A unique role of ionic strength (1992)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 38 (1992), S. 153-157 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690380116
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Role of tunneling of hydrogen in photoenolization of a ketone (1994)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 52 (1994), S. 1317-1328 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photoenolization of a ketone in its lowest triplet state was examined using the AM1 semiempirical molecular orbital method with complete geometry optimization at the configuration interaction level in the restricted Hartree-Fock frame. The theoretical barrier fits with a polynomial given by Eq. (1) and the probability of tunneling of hydrogen was calculated by the WKB method. The density of states above the zero-point level was estimated by the Whitten-Rabinovitch approximation. Rate constants for the hydrogen and deuterium-abstraction processes via tunneling were then computed at different temperatures. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560520607
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Carbon-13 NMR spectra of 1-substituted prop-2-ynes and 1,4-bis-derivatives of but-2-yne (1992)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 1145-1148 
    Details
    ISSN: 0749-1581
    Keywords: 13C NMR ; 1,4-Bis-derivatives of but-2-yne ; 1-Substituted prop-2-ynes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C NMR data for several 1-substituted prop-2-ynes and 1,4-bis derivatives of but-2-yne are reported with full assignments. Substituent effects of  - X - aryl groups (X = O, S, NMe, SO2) at the propargylic position on the chemical shifts of the acetylenic carbons were determined.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260301123
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    Paper (German National Licenses)
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  • 5
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    Analysis of stratocumulus cloud fields using LANDSAT imagery: Size distributions and spatial separations (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Stratocumulus cloud fields in the FIRE IFO region are analyzed using LANDSAT Thematic Mapper imagery. Structural properties such as cloud cell size distribution, cell horizontal aspect ratio, fractional coverage and fractal dimension are determined. It is found that stratocumulus cloud number densities are represented by a power law. Cell horizontal aspect ratio has a tendency to increase at large cell sizes, and cells are bi-fractal in nature. Using LANDSAT Multispectral Scanner imagery for twelve selected stratocumulus scenes acquired during previous years, similar structural characteristics are obtained. Cloud field spatial organization also is analyzed. Nearest-neighbor spacings are fit with a number of functions, with Weibull and Gamma distributions providing the best fits. Poisson tests show that the spatial separations are not random. Second order statistics are used to examine clustering.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA, Langley Research Center, FIRE Science Results 1988; p 277
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Cumulus cloud base height estimation from high spatial resolution Landsat data - A Hough transform approach (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A semiautomated methodology is developed for estimating cumulus cloud base heights on the basis of high spatial resolution Landsat MSS data, using various image-processing techniques to match cloud edges with their corresponding shadow edges. The cloud base height is then estimated by computing the separation distance between the corresponding generalized Hough transform reference points. The differences between the cloud base heights computed by these means and a manual verification technique are of the order of 100 m or less; accuracies of 50-70 m may soon be possible via EOS instruments.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); 30; 3 Ma
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Automated detection of jet contrails using the AVHRR split window (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper investigates the automated detection of jet contrails using data from the Advanced Very High Resolution Radiometer. A preliminary algorithm subtracts the 11.8-micron image from the 10.8-micron image, creating a difference image on which contrails are enhanced. Then a three-stage algorithm searches the difference image for the nearly-straight line segments which characterize contrails. First, the algorithm searches for elevated, linear patterns called 'ridges'. Second, it applies a Hough transform to the detected ridges to locate nearly-straight lines. Third, the algorithm determines which of the nearly-straight lines are likely to be contrails. The paper applies this technique to several test scenes.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: International Journal of Remote Sensing (ISSN 0143-1161); 13; 8 Ma
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Cloud classification in polar regions using AVHRR textural and spectral signatures (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Arctic clouds and ice-covered surfaces are classified on the basis of textural and spectral features obtained with AVHRR 1.1-km spatial resolution imagery over the Beaufort Sea during May-October, 1989. Scenes were acquired about every 5 days, for a total of 38 cases. A list comprising 20 arctic-surface and cloud classes is compiled using spectral measures defined by Garand (1988).
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Atmospheric Radiation; Jul 23, 1990 - Jul 27, 1990; San Francisco, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Automated cloud base height determination from high resolution Landsat data - A Hough transform approach (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A direct method for determining the cloud base height derived from the displacement of the shadow from the cloud, and the solar azimuth and zenith angle is presented. Cumulus cloud scenes over land from Landsat MSS imagery are considered. The clouds are first matched with the corresponding shadows; the pixel distance of a reference point in the cloud is computed from the corresponding reference point in the shadow; and then the solar zenith angle is used to compute the cloud base height. Observations indicate that the cloud base height appears to be size-dependent with larger clouds generally associated with higher cloud bases and that clouds within the same size range and within the same scene region are approximately of the same height.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Atmospheric Radiation; Jul 23, 1990 - Jul 27, 1990; San Francisco, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Pattern recognition of clouds and ice in polar regions (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The study is based on AVHRR imagery and results from Landsat high-spatial-resolution scenes. Among the textual features investigated are the gray level difference vector (GLDV), and sum and difference histogram (SADH) approaches as well as gray level run length, spatial-coherence, and spectral-histogram measures. The traditional stepwise discriminant analysis and neural-network analysis are used for the identification of 20 Arctic surface and cloud classes. A principal-component analysis and hybrid architecture employing a modularized competitive learning layer are utilized. It is pointed out that the cloud-classification accuracy comparable to that of back-propagation could be achieved with a training time two orders of magnitude faster.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Long-term Monitoring of the Earth''s Radiation Budget; Apr 17, 1990 - Apr 18, 1990; Orlando, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
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