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  • Organic Chemistry  (77)
  • Astrophysics  (58)
  • 2000-2004  (58)
  • 1960-1964  (77)
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  • 1
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    Vertical Distribution of Shallow Water in the Distinguishable Regions at Low and High Latitudes of Mars: Neutron Data Deconvolution of HEND (2003)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: High Energy Neutron Detector (HEND) is the part of Gamma-Ray Spectrometer suite onboard NASA Mars Odyssey orbiter [1-4]. During 16 months of mapping stage of Odyssey mission HEND has accumulated the set of maps of neutron emission of Mars at more than seven decades of energies range from the Cadmium threshold of 0.4 eV up to 15 MeV. These maps present very large variations of neutrons at different regions of Mars and they also show quite strong changes along Martian seasons.
    Keywords: Astrophysics
    Type: Sixth International Conference on Mars; LPI-Contrib-1164
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  • 2
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    The stellar content of the polar rings in the galaxies NGC2685 and NGC 4650a (2004)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: We present the results of stellar photometry of polar ring galaxies NGC 2685 and NGC 4650A, using the archival data obtained with the Hubble Space Telescope's Wide Field Planetary Camera 2.
    Keywords: Astrophysics
    Type: Astrophysical Journal; Volume 127; 789-797
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  • 3
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    Propagation Model for Cosmic Ray Species in the Galaxy (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: During the last decade there have been a number of space and balloon experiments with improved sensivity and statistics, which impose stricter constraints on cosmic ray propagation models. Propagation is the main issue in the interpretation of such data as antiproton and positron fluxes in cosmic rays, and diffuse gamma-ray emission. We develop a new propagation model that reproduces measurements of secondary antiprotons as well as primary and secondary nuclei. We will present results of our calculation of CR propagation in the Galaxy for this model using the GALPROP code.
    Keywords: Astrophysics
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  • 4
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    Northern and Southern Permafrost Regions on Mars with High Content of Water Ice: Similarities and Differences (2004)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The measurements by neutron detectors on Odyssey have revealed two large poleward regions with large depression of flux of epithermal and high energy neutrons. The flux of neutrons from Mars is known to be produced by the bombardment of the surface layer by galactic cosmic rays. The leakage flux of epithermal and fast neutrons has regional variation by a factor of 10 over the surface of Mars. These variations are mainly produced by variations of hydrogen content in the shallow subsurface. On Mars hydrogen is associated with water. Therefore, the Northern and Southern depressions of neutron emission could be identified as permafrost regions with very high content of water ice. These regions are much larger than the residual polar caps, and could contain the major fraction of subsurface water ice. Here we present the results of HEND neutron data deconvolution for these regions and describe the similarities and differences between them.
    Keywords: Astrophysics
    Type: Lunar and Planetary Science XXXV: Special Session: Mars Climate Change; LPI-Contrib-1197
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  • 5
    Electronic Resource
    Electronic Resource
    Umsetzungen von Silicium-Kohlenstoff-Heterocyclen unter Einwirkung von Aluminiumchlorid (1964)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 281-287 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mit 1,1-Dimethylsilacyclopentan läßt sich mit AlCl3 eine Ring-Ketten-Polymerisation zu öligen oder kautschukartigen Produkten durchführen. Sind Chlor, Phenyl-oder Benzylgruppen bzw. Reste mit carbofunktionellen Liganden als Substituenten vorhanden, so tritt die Polymerisation nicht ein. Bis(methyltetramethylensila)äthylen polymerisierte zu einem unlöslichen Trimeren. Aus 1-(γ-Chlorpropyl)-1-methylsilacyclopentan entstand mit AlCl3 das entsprechende Chlorsilan unter Abspaltung von Cyclopropan. Bei der Einwirkung von AlCl3 auf 1-Chlormethyl-1-methylsilacyclopentan bildete sich ein Sechsring.Das Polymere des 1-Hydro-1-methylsilacyclopentans kann mit Luftsauerstoff oxydiert und vernetzt werden. An die HSi-Gruppen können γ-Cyanopropylreste angelagert werden. Die Reaktionen wurden durch IR-Spektren verfolgt, Reaktionsmechanismen diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19640230506
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  • 6
    Electronic Resource
    Electronic Resource
    Studies in antibacterials: - synthesis of hydroxy - chloro chalkones. II (1962)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 17 (1962), S. 1-4 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: With a view to study their antibacterial properties a number of chalkones have been prepated employing 2:3- and 2:4-dichlorobenzaldehydes and a number of substituted hydroxy catophenones. These have been characterised by preparation of their derivatives. The behaviour of some of these chalkones when submitted to Algar-Flynn reaction has also been studied and the results recorded.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19620170101
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  • 7
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    The Miniaturized Moessbauer Spectrometer MIMOS II of the Athena Payload for the 2003 MER Missions (2003)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: A first-order requirement of spacecraft missions that land on Mars is instrumentation for in situ mineralogical analysis. Moessbauer Spectroscopy is a powerful tool for quantitative analysis of Fe-bearing materials. The Athena Moessbauer spectrometer MIMOS II on the martian surface will provide: (1) identification of iron-bearing phases (e.g., oxides, silicates, sulfides, sulfates, and carbonates), (2) quantitative measurement of the distribution of iron among its oxidation states (e.g., Fe(2+)/Fe(3+) ratio), and (3) quantitative measurement of the distribution of iron among iron-bearing phases (e.g., the relative proportions of iron in olivine, pyroxene, and magnetite in a basalt) in rocks and soils. Moessbauer data will also be highly complementary with chemical analyses from the APXS and the Mini-TES compositional data. Mars is a particularly good place to do Moessbauer mineralogy because its surface is iron rich (approx. 20% Fe as Fe2O3). Moessbauer spectrometers that are built with backscatter measurement geometry require no sample preparation, a factor important for in situ planetary measurements.
    Keywords: Astrophysics
    Type: Sixth International Conference on Mars; LPI-Contrib-1164
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  • 8
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    Experimental study of SubMM wave superconducting hot-electron direct detectors (2002)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Astrophysics
    Type: Applied Superconductivity Conference 2002; Houston, TX; United States
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  • 9
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    High-Energy Emission From Millisecond Pulsars (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: The X-ray and gamma-ray spectrum of rotation-powered millisecond pulsars is investigated in a model for acceleration and pair cascades on open field lines above the polar caps. Although these pulsars have low surface magnetic fields, their short periods allow them to have large magnetospheric potential drops, but the majority do not produce sufficient pairs to completely screen the accelerating electric field. In these sources, the primary and secondary electrons continue to accelerate to high altitude and their Lorentz factors are limited by curvature and synchrotron radiation reaction. The accelerating particles maintain high Lorentz factors and undergo cyclotron resonant absorption of radio emission, that produces and maintains a large pitch angle, resulting in a strong synchrotron component. The resulting spectra consist of several distinct components: curvature radiation from primary electrons dominating from 1 - 100 GeV, synchrotron radiation from primary and secondary electrons dominating up to about 100 MeV, and much weaker inverse-Compton radiation from primary electrons a t 0.1 - 1 TeV. We find that the relative size of these components depends on pulsar period, period derivative, and neutron star mass and radius with the level of the synchrotron component also depending sensitively on the radio emission properties. This model is successful in describing the observed X-ray and gamma-ray spectrum of PSR J0218+4232 as synchrotron radiation, peaking around 100 MeV and extending up to a turnover around several GeV. The predicted curvature radiation components from a number of millisecond pulsars, as well as the collective emission from the millisecond pulsars in globular clusters, should be detectable with AGILE and GLAST. We also discuss a hidden population of X-ray-quiet and radio-quiet millisecond pulsars which have evolved below the pair death line, some of which may be detectable by telescopes sensitive above 1 GeV. Subject headings: pulsars: general - radiation mechanisms: nonthermal - stars: neutron - gamma rays: theory
    Keywords: Astrophysics
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  • 10
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    Near-Relativistic Solar Electrons and Type III Radio Bursts (2003)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: Recently it has been found that the inferred injection times of greater than 25 keV electrons are up to 30 minutes later than the start times of the associated type III radio bursts at the Sun. Thus it has been suggested that the electrons that produce type III bursts do not belong to the same population as those observed above 25 keV. This paper examines the characteristics and circumstances of 79 solar electron beam events measured on the ACE spacecraft. Particular attention is paid to the very low frequency emissions of the associated radio bursts and the ambient conditions at the arrival times of the electrons at the spacecraft. It is found that the inferred greater than 25 keV electron injection delays are correlated with the times required for the associated radio bursts to drift to the lowest frequencies. This suggests that the electrons responsible for the radio emission and those observed above 25 keV are part of a single population, and that the electrons both above and below 25 keV are delayed in the interplanetary medium. Further evidence for a single population is the general correspondence between electron and local radio intensities and temporal profiles. It is found that the delays increase with the ambient solar wind density consistent with the propagation times of the electrons being determined by the characteristics of the interplanetary medium. However it is known that particle arrival times at 1 AU are a linear function of inverse particle speed. Conventionally such a relationship is taken to indicate scatter-free propagation when inferred path lengths lie close to 1.2 AU, as they do for the electron events studied here. These conflicting interpretations require further investigation.
    Keywords: Astrophysics
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