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  • Inorganic Chemistry  (83,671)
  • Chemical Engineering  (17,982)
  • ASTROPHYSICS  (16,581)
  • SPACE SCIENCES  (12,837)
Collection
Keywords
Publisher
Language
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  • 1
    Electronic Resource
    Electronic Resource
    Ein neues Verfahren zur Synthese von Aminalen und Enaminen (1967)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 100 (1967), S. 1289-1295 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ein neues Verfahren zur Synthese von Aminalen und Enaminen durch Umsetzung von Tris(dimethylamino)-arsin mit Aldehyden oder Ketonen wird beschrieben. Diese Reaktion ist auch auf andere Tris(dialkylamino)-arsine übertragbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19671000430
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    Paper (German National Licenses)
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  • 2
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    Can comet clouds around neutron stars explain gamma-ray bursts? (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The proposal of Harwit and Salpeter (1973) that gamma-ray bursts are due to impacts of comets onto neutron stars is examined further. It is assumed that most stars are formed with comet clouds similar to the Oort comet cloud which surrounds the sun, and it is suggested that there are at least four mechanisms by wich neutron stars may be formed while retaining their comet clouds: a spherically symmetric supernova explosion in an isolated star, accretion-induced collapse of a white dwarf in a cataclysmic variable with a very low mass secondary, accretion-induced collapse of a white dwarf in a wide binary with a low-mass giant companion, and coalescence of a close binary composed of two white dwarfs. Estimates are given of the cometary impact rates for such systems. It is suggested that if the wide binary scenario is correct, optical bursts may arise from the impact of comets onto the white dwarf remnant of the giant companion.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 301; 155-163
    Format: text
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  • 3
    Electronic Resource
    Electronic Resource
    Die Totalsynthese von (±)-Pukatein (1969)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 2959-2965 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das in seiner Struktur als 11-Hydroxy-1.2-methylendioxy-aporphin (16) aufgeklärte2) Alkaloid Pukatein wurde synthetisiert. Aus dem Amin 9 und 2-Nitro-3-benzyloxy-phenyl-essigsäure (8) (Weg A) bzw. 2-Nitro-3-benzyloxy-ω-diazo-acetophenon (7) (Weg B) wurde das Amid 10 hergestellt. Isochinolinringschluß nach Bischler-Napieralski und Pschorr-Ringschluß führten zum (±)-11-Benzyloxy-1.2-methylendioxy-aporphin (15), dessen Hydrogenolyse 16 ergab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19691020910
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  • 4
    Electronic Resource
    Electronic Resource
    Eine stereoselektive Synthese von cis- und trans-3-Phenyl-2-carboxy-pyrrolidon-(5) (1967)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 100 (1967), S. 1137-1143 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Kondensation von Zimtsäure-äthylester und N-Acetyl-glycin-äthylester-natrium entsteht stereoselektiv trans-3-Phenyl-2-carboxy-pyrrolidon-(5) (2a1), während sich durch thermische Decarboxylierung von 3-Phenyl-2.2-dicarboxy-pyrrolidon-(5) (8) die reine cis-Form bildet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19671000411
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  • 5
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    Flux-limited diffusion in a scattering medium (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A diffusion equation (FDT) is presented with a coefficient that reduces to the appropriate limiting form in the streaming and near thermodynamic limits for a moving fluid in which the dominant source of opacity is Thomson scattering. The present results are compared to those obtained with the corresponding equations for an absorptive medium. It is found that FDT for a scattering medium is accurate to better than less than about 17 percent over the range of optical depths of tau in the range of about 0 to 3.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 374; 732-740
    Format: text
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  • 6
    Electronic Resource
    Electronic Resource
    Discrete structural models and their application to gas-solid reacting systems (1988)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 34 (1988), S. 2030-2040 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Discrete models are developed to simulate the reaction of solids with complex pore structures in the kinetic- and diffusion-controlled regimes. Simulations employ two- and three-dimensional computational grids, and model parameters are directly obtainable from measurable physical properties of the unreacted solid. Model predictions can be displayed pictorially, allowing for direct visualization of the simulated process, while image processing of the computational grids can provide detailed structural information not easily obtainable from other analytical models. The effects of various pore structural parameters on the predicted reactivity patterns are investigated. Several examples are presented to illustrate the use of the models and demonstrate the significance of the pore structure in determining the reactivity of coal-derived chars.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690341212
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  • 7
    Electronic Resource
    Electronic Resource
    Membrane handbook edited by W. S. Winston Ho, and Kamalesh K. Sirkar, Van Nostrand Reinhold, New York, 1992, 954 pp. $131.95 (1995)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 41 (1995), S. 2343-2344 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690411024
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  • 8
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    X-ray refelection from photoionized media in active galactic nuclei (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: We calculate the spectrum of X-ray radiation and reprocessed by a partly ionized optically thick medium in an active galactic nucleus. We self-consistently calculate the ionization balance and thermal balance in the medium along with the distribution of X-ray intensity with optical depth. In addition to absorption or scattering of the incident X-rays, we also compute the spectrum of X-rays emitted by the material, including lines, edges, and bremsstrahlung. The albedo of the medium depends primarily on the X-ray ionization parameter (ratio of incident flux to gas density, zeta(sub Chi), and secondarily on the UV flux generated by dissipation inside the disk; we locate the critical range of zeta(sub Chi) over which the albedo increases from small to nearly unity. While the continuum reflection is very weak below 10 keV when zeta(sub Chi) is small, significnat fluxes are emitted in atomic lines and edges in this energy range. In the limit of large zeta(sub Chi), the albedo below 10 keV increases, but reflection in this band is never gray: some photoelectric absorption remains up to rather large values of zeta(sub Chi), while at still higher values, inverse Compton scattering amplifies the soft X-ray flux. These features are sufficiently sharp that current and near-future X-ray experiments should permit diagnostic measures of zeta(sub Chi).
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 437; 2; p. 597-610
    Format: text
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  • 9
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    COMPTEL neutron response at 17 MeV (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Compton imaging telescope (COMPTEL) instrument of the Gamma Ray Observatory was exposed to 17 MeV d,t neutrons prior to launch. These data were analyzed and compared with Monte Carlo calculations using the MCNP(LANL) code. Energy and angular resolutions are compared and absolute efficiencies are calculated at 0 and 30 degrees incident angle. The COMPTEL neutron responses at 17 MeV and higher energies are needed to understand solar flare neutron data.
    Keywords: ASTROPHYSICS
    Type: NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop,; p 109-115
    Format: application/pdf
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  • 10
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    Low-energy and medium-energy gamma rays from PSR 0531 + 21 (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Results are presented from the Crab Pulsar PSR 0531 + 21 for energies of 0.3-30 MeV. For energies of 1-30 MeV, the absolute phase and separation of the first and second pulses 12.9 + or - 0.3 ms, widths of the pulses 2.2 + or - 0.5 ms FWHM, and 1.6 + or - 0.4 ms FWHM, ratio of the counts in the second to the first pulse 0.64 + or - 0.33 and ratio of counts in the interpulse region to the total pulsed counts 0.17 + or - 0.30 are compared to te results vor energies, E greater than 50 MeV and their variations with time. Values from the phase plots for E greater than 0.3 MeV are compared with low-energy gamma rays during 1970 through 1980 from several experiments with energies from about 20 to 360 keV. The above suggest different production mechanisms for low- and high-energy gamma rays with a transition at about 1 MeV. Derived fluxes from 0.3 to 30 MeV confirm a previously derived power law.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 299; L23-L27
    Format: text
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