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  • 1
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    The spectrum of HM Sagittae - A planetary nebula excited by a Wolf-Rayet Star (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Keywords: ASTROPHYSICS
    Type: Astrophysical Letters; 19; 3, 19; 1978
    Format: text
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  • 2
    Electronic Resource
    Electronic Resource
    Mass spectrometry of N-nitrosaminesResearch sponsored by the Energy Research and Development Administration under contract with the Union Carbide Corporation. (1978)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1978), S. 395-408 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preparation of a series of N-nitrosamines for carcinogenicity studies presented an opportunity to study mass spectral fragmentation schemes in detail. Condensed spectra are listed for 146 N-nitrosamines of widely differing structures, including nitroso derivatives of commercial drugs and insecticides. Aliphatic nitrosamines were generally characterized by molecular ions and loss of OH. Subsequent fragmentation via α-cleavage is similar to that of aliphatic amines. The loss of OH is believed to result in a cyclic ion. Substituted aliphatic nitrosamines varied in fragmentation schemes with structure and position of the substituent groups. However, most showed α-cleavage at some point in fragmentation. When substituted with aromatic groups, prominent peaks due to the aromatic moiety were observed. The alicyclic nitrosamines showed losses of NO, NOH and OH and subsequent α-cleavages. Nitrosamides were characterized by rupture of the carbonyl to nitrogen bond. Spectra of substituted ureas usually showed charge retention by the carbonyl fragment, while carbamate esters showed ions from both fragments.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200050606
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  • 3
    Electronic Resource
    Electronic Resource
    Chemische Reaktionen in Salzschmelzen. XVIII. Die Synthese des Methylzinntrichlorids, CH3SnCl3 (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 444 (1978), S. 21-29 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemical Reactions in Molten Salts. XVIII. Synthesis of Methyltin Trichloride, Ch3SnCl3A process for the synthesis of CH3SnCl3 by reaction of molten SnCl2 and CH2Cl infused salts is described. Out of the systems investigated with NaCl, KCl, AlCl3, ZnCl2, KZnCl3, LiAlCl4, NaAlCl4, KAlCl4, and CuAlCl4, the systems with NaAlCl4 and NaAlCl4/KAlCl4 proved best. We measured the space-time-yield (RZA) as a function of the salts admixed to SnCl2 as well as a function of the reaction temperatur, gasification, and inlet rate of CH3Cl respectively. The optimum reaction conditions are investigated and the system SnCl2//NaAlCl4 is described.
    Notes: Ein Verfahren zur Synthese von CH3SnCl3 durch Reaktion von geschmolzenem SnCl2 mit CH3Cl in Salzschmelzen wird beschrieben. Von den untersuchten Systemen mit NaCl, KCl, AlCl3, ZnCl2, KZnCl3, LiAlCl4, NaAlCl4, KAlCl4 und CuAlCl4 erwiesen sich als besonders vorteilhaft NaAlCl4 und NaAlCl4/KAlCl4. Gemessen wurde die Abhängigkeit der Raum-Zeit-Ausbeute (RZA) vom Zusatz von Fremdsalz zum SnCl2 sowie von der Reaktions-Temperatur, der Begasung und der Einleitgeschwindigkeit von CH3Cl, und die optimalen Versuchsbedingungen bestimmt. Das System SnCl2/NaAlCl4 wird beschrieben.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784440102
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  • 4
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    Coordinated photometric and spectroscopic observations of strong extragalactic 90 GHz sources (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Nearly simultaneous radio and infrared-optical observations were obtained for several extragalactic radio sources which are strong at 90 GHz. The spectral-flux distributions are generally peaked or flat over the radio portion of the spectrum with a steeper, power-law behavior at infrared-optical frequencies. For all sources, the radio and infrared-optical portions of the spectral-flux distributions can be smoothly joined by physically sensible interpolations over the spectral gap, although spectral breaks are required. For many of the sources, this is consistent with a common (synchrotron) origin of the radio, millimeter, and infrared-optical radiation. However, proof, in terms of correlated temporal variations and polarization properties, is still generally lacking.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 224
    Format: text
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  • 5
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    Properties of the 2-6 keV pulse profiles of Hercules X-1 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 225
    Format: text
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  • 6
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    Ortho- and para-hydrogen in dense clouds, protoplanets, and planetary atmospheres (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: If ortho- and para-hydrogen achieve a thermal ratio on dynamical time scales in a molecular hydrogen cloud, then the specific heat is high enough in the temperature range 35-70 K to possibly induce hydrodynamic collapse. The ortho-para ratio in many interstellar cloud fragments is expected to meet this condition. The same may have been true for the primitive solar nebula. Detailed hydrodynamic and hydrostatic calculations are presented that show the effects of the assumed ortho-para ratio on the evolution of Jupiter during its protoplanetary phase. Some possible consequences of a thermalized ortho-para ratio in the atmospheres of the giant planets are also discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 223
    Format: text
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  • 7
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    Bar-driven spiral waves in disk galaxies (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The response of rotating disks of gas to barlike perturbations in galactic gravitational fields is investigated. In particular, two-dimensional time-dependent numerical hydrodynamical calculations have been performed in order to determine the steady-state response of disks of gas to rotating barlike perturbations. Two types of barlike perturbations are considered: oval distortions in the axisymmetric gravitational field of the disk, and heterogeneous prolate spheroids. The calculations reveal that in the absence of gaseous self-gravity, a viscous differentially rotating disk of gas responds to a rotating barlike perturbation by forming a central gas bar with two trailing spiral waves. The local phase of the gas response is primarily a function of the number and spacing of the principal resonances in the disk. This result may be understood in terms of particle orbit theory. The gas response to barlike perturbations also depends on the relative strength and the effective axial ratio of the bar. In these calculations strong narrow bars produce offset shocks in the central gas bar. These shocks correspond in position to the long narrow dust lanes observed in many barred spiral galaxies.
    Keywords: ASTROPHYSICS
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  • 8
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    Ultraviolet observations of cool stars. VII - Local interstellar hydrogen and deuterium Lyman-alpha (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: High-resolution Copernicus spectra of Epsilon Eri and Epsilon Ind containing interstellar hydrogen and deuterium L-alpha absorption lines are presented, reduced, and analyzed. Parameters of the interstellar hydrogen and deuterium toward these two stars are derived independently, without any assumptions concerning the D/H ratio. Copernicus spectra of Alpha Aur and Alpha Cen A are reanalyzed, and limits on the D/H number-density ratio consistent with the data for all four stars are considered. A comparison of the present estimates for the parameters of the local interstellar medium with those obtained by other techniques shows that there is no compelling evidence for significant variations in the hydrogen density and D/H ratio in the local interstellar medium. On this basis the hypothesis of an approaching local interstellar cloud proposed by Vidal-Madjar et al. (1978) is rejected
    Keywords: ASTROPHYSICS
    Type: PB-289017 , Astrophysical Journal; vol. 225
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  • 9
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    Correlated photometric and polarimetric phenomena in AM Herculis (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Via simultaneous multicolor photometry and polarimetry of AM Herculis, we find correlations among polarization, flux, and color in the V and I bands in periodic and nonperiodic (i.e., flickering) activity. The primary minimum observed in both bands is accompanied by a blueward shift of the (B - R) color and a decrease in the absolute value of the percent circular polarization in the V band. Outside primary minimum, peaks of flickering activity tend to be associated with an increase in the absolute value of the circular polarization and the concurrent reddening of the (B - R) and (R - I) colors. The visual light curve of AM Her can be explained by a flickering, circularly polarized light source which is obscured at primary minimum, and is redder than the total system color in the URVRI bands.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 225
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  • 10
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    Collisional excitation of interstellar formaldehyde (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Previous calculations for rates of excitation of ortho-H2CO by collisions with He have been extended to higher rotational levels and kinetic temperatures to 80 K. Rates for para-H2CO have also been computed. Pressure-broadening widths for several spectral lines have been obtained from these calculations and are found to agree with recent data within the experimental uncertainty of 10%. Excitation of formaldehyde by collisions with H2 molecules is also discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal Supplement Series; 37; July 197
    Format: text
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