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  • Exobiology  (3)
  • ACOUSTICS  (2)
  • Inorganic Chemistry  (2)
  • 5'-O-demethyl-8-O-methyl-dioncophylline A
  • 1
    Electronic Resource
    Electronic Resource
    5'-O-demethyl-8-O-methyl-7-epi-dioncophylline a and its 'regularly' configurated atropisomer from Triphyophyllum peltatum
    Amsterdam : Elsevier
    Phytochemistry 36 (1994), S. 1057-1061 
    Details
    ISSN: 0031-9422
    Keywords: 5'-O-demethyl-8-O-methyl-7-epi-dioncophylline A ; 5'-O-demethyl-8-O-methyl-dioncophylline A ; Dioncophyllaceae ; Triphyophyllum peltatum ; atropisomerism. ; biaryls ; naphthylisoquinoline alkaloids ; stem bark
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)90491-6
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Die Schwingungsspektren der Methyl- und Phenylchlorphosphine (1965)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 337 (1965), S. 174-182 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The vibrational spectra of PCl(CH3)2, PCl2CH3, PCl(C6H5)2 and PCl2C6H5 are reported and discussed. For the methyl compounds the force constants are calculated.
    Notes: Es werden die Schwingungsspektren von PCl(CH3)2, PCl2CH3, PCl(C6H5)2 und PCl2C6H5 mitgeteilt, mit den Spektren von PCl3, P(CH3)3 und P(C6H5)3 verglichen und den Grundschwingungen zugeordnet. Für die Methylverbindungen werden die Kraftkonstanten berechnet und die Bindungsverhältnisse diskutiert. Darstellung und Eigenschaften der Methylverbindungen werden beschrieben.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19653370310
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Über den Aufbau von β-Dekalon aus Cyclohexanon (1937)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 70 (1937), S. 355-359 
    Details
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19370700233
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    Paper (German National Licenses)
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  • 4
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    The C4H7+ cation. A theoretical investigation (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The potential energy surface of the C4H7+ cation has been investigated with ab initio quantum chemical theory. Extended basis set calculations, including electronic correlation, show that cyclobutyl and cyclopropylcarbinyl cation are equally stable isomers. The saddle point connecting these isomers lies 0.6 kcal/mol above the minima. The global C4H7+ minimum corresponds to the 1-methylallyl cation, which is 9.0 kcal/mol more stable than the cyclobutyl and the cyclopropylcarbinyl cation and 9.5 kcal/mol below the 2-methylallyl cation. These results are in excellent agreement with experimental data.
    Keywords: Exobiology
    Type: Journal of the American Chemical Society (ISSN 0002-7863); Volume 110; 22; 7325-8
    Format: text
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  • 5
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    Structure of the 2-norbornyl cation (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: No abstract available
    Keywords: Exobiology
    Type: Journal of the American Chemical Society (ISSN 0002-7863); Volume 111; 1527-8
    Format: text
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  • 6
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    Experimental and theoretical IR spectra of the 2-norbornyl cation (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Exobiology
    Type: Angewandte Chemie (International ed. in English) (ISSN 0570-0833); 29; 2; 183-5
    Format: text
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  • 7
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    On eigensolutions for discontinuous liners in a duct containing uniform mean flow (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Sound attenuation in a rectangular acoustically lined duct containing uniform mean flow is analytically investigated using the generalized Wiener-Hopf technique. Uniqueness of the solution is enforced for lined sections of the finite axial extent by imposing edge conditions at the liner interface. Possible edge conditions are considered, including the Kutta condition, and the causal solution corresponding to edge conditions is considered the best choice. Solution methods such as the mode matching and singularity methods imply differing edge conditions, and results show that power attenuation is insensitive to the imposed edge conditions, although significant differences are observed for the reflection coefficient. The amplitude of the exponentially increasing instability mode in the lined section must be set to zero as a first approximation to the nonlinear situation, and results indicate that measurements of the reflection factor can be used to make a more definite decision about physically appropriate edge conditions.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 81-2017 , Aeroacoustics Conference; Oct 05, 1981 - Oct 07, 1981; Palo Alto, CA
    Format: text
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  • 8
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    On the attenuation of sound by three-dimensionally segmented acoustic liners in a rectangular duct (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Axial segmentation of acoustically absorbing liners in rectangular, circular or annual duct configurations is a very useful concept for obtaining higher noise attenuation with respect to the bandwidth of absorption as well as the maximum attenuation. As a consequence, advanced liner concepts are proposed which induce a modal energy transfer in both cross-sectional directions to further reduce the noise radiated from turbofan engines. However, these advanced liner concepts require three-dimensional geometries which are difficult to treat theoretically. A very simple three-dimensional problem is investigated analytically. The results show a strong dependence on the positioning of the liner for some incident source modes while the effect of three-dimensional segmentation appears to be negligible over the frequency range considered.
    Keywords: ACOUSTICS
    Type: NASA-TM-80118
    Format: application/pdf
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