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  • SPACE RADIATION  (13)
  • Aerobiology  (2)
  • Gastrointestinal system
  • Graphitic oxide
  • 1995-1999  (3)
  • 1980-1984  (14)
  • 1850-1859
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Intercalation compounds of trimethylphosphate in graphitic oxide (1984)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 1 (1984), S. 411-417 
    Details
    ISSN: 1573-1111
    Keywords: Graphitic oxide ; trimethylphosphate ; IR spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The intercalation compounds of trimethylphosphate (TMP) in graphite oxide (GO) have been synthezized. Two compounds have been characterized, corresponding to intercalation of one or two molecules of TMP, and have been characterized by gravimetric adsorption, X-ray diffraction and infrared spectroscopy. Bonding between TMP and graphitic oxide takes place through hydrogen bonding with OH groups of the layered material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00665484
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Sampling in aerobiology. Differences between traverses along the length of the slide in Hirst sporetraps (1996)
    Springer
    Aerobiologia 12 (1996), S. 161-166 
    Details
    ISSN: 1573-3025
    Keywords: Aerobiology ; Methodology ; Sampling error ; Burkard sporetrap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two years of data from four longitudinal traverses along each day's slide prepared from a continuously running Burkard sporetrap have been analyzed statistically. Using the Friedman test, a statistically significant difference was found between the four traverses, with a greater than 7% loss of pollen grains in the two outer traverses in relation to the inner. Four slides were then selected for more detailed analysis, using 18 longitudinal traverses with a 1-mm separation from the upper to the lower edge of the Melinex tape. There was found to be a progressive decline from the centre to the outside, and more than 4% of pollen grains were found outside the typical 14 mm width of the impaction orifice. There was no correlation between pollen grain size and the decline in counts from the centre to the outside. For the complete data set, there was a general rise in the diversity of bollen types with increasing sample counts, but above about 1000 pollen grains per sample there were no more than 27 pollen types found, often even fewer. A discussion is presented of whether four traverses really should be a fixing sample size, or whether it might be better to fix the total pollen count beginning with a traverse in the middle of the slide and ending with a variable number of traverses when that count is reached.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447407
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Sampling in aerobiology. Differences between traverses along the length of the slide in Hirst sporetraps (1996)
    Springer
    Aerobiologia 12 (1996), S. 161-166 
    Details
    ISSN: 1573-3025
    Keywords: Aerobiology ; Methodology ; Sampling error ; Burkard sporetrap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two years of data from four longitudinal traverses along each day's slide prepared from a continuously running Burkard sporetrap have been analyzed statistically. Using the Friedman test, a statistically significant difference was found between the four traverses, with a greater than 7% loss of pollen grains in the two outer traverses in relation to the inner. Four slides were then selected for more detailed analysis, using 18 longitudinal traverses with a 1-mm separation from the upper to the lower edge of the Melinex tape. There was found to be a progressive decline from the centre to the outside, and more than 4% of pollen grains were found outside the typical 14 mm width of the impaction orifice. There was no correlation between pollen grain size and the decline in counts from the centre to the outside. For the complete data set, there was a general rise in the diversity of pollen types with increasing sample counts, but above about 1000 pollen grains per sample there were no more than 27 pollen types found, often even fewer. A discussion is presented of whether four traverses really should be a fixing sample size, or whether it might be better to fix the total pollen count beginning with a traverse in the middle of the slide and ending with a variable number of traverses when that count is reached.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02248144
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructural study of the epithelial mucous cells in lizards (Lacertilia) (1982)
    Springer
    Cell & tissue research 221 (1982), S. 679-686 
    Details
    ISSN: 1432-0878
    Keywords: Mucous cells ; Small intestine ; Gastrointestinal system ; Lizard ; Lacertilia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An ultrastructural study of the mucous cells of the intestinal epithelium of four lacertilian species (Lacerta lepida, Lacerta hispanica, Psammodromus algirus and Acanthodactylus erythrurus) is here reported. Two types of mucous cells have been found in these species: common mucous cells and granular mucous cells. Immature and mature forms of both types have been observed. The common mucous cells or typical goblet cells have the same characteristics in all four species. The granules of the granular mucous cells of the two species of Lacerta are similar but differ from those of the other two species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215710
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    Paper (German National Licenses)
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  • 5
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    A quantitative test of solar modulation theory - The proton, helium, and electron spectra from 1965 through 1979 (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The predictions of a conventional, spherically symmetric model of solar modulation have been compared with the measured spectra of positively and negatively charged galactic cosmic-ray particles at 1 AU throughout the 1965-1976 solar cycle and through the enhanced modulation of 1979. For the proton/helium, proton/electron, and helium/electron flux ratios, there is remarkably good agreement between theory and experiment, except for small differences in 1965 and 1969. Possible systematic experimental errors are discussed, and it is concluded that: (1) the 11 year modulation process is largely independent of the sign of the particle charge; and (2) the assumption of steady state is a fairly good approximation for long term modulation.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 275; L15-L18
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The path-length distribution for galactic cosmic-ray propagation - An energy-dependent depletion of short path lengths (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is shown that at low energies, the depletion of short path lengths in the interstellar cosmic-ray path-length distribution is a function of energy, decreasing in magnitude with increasing energy. The analysis leading to this conclusion is based on the comparison of compiled data for the B/C and sub-Fe/Fe ratios at 0.08-50 GeV per nucleon, with the results of detailed galactic propagation and solar modulation calculations, which include experimental values for the important nuclear cross sections. This energy dependence of the depletion resolves some of the conflicts between previous reports on the question of short path lengths and may be explained by models including a matter distribution around discrete sources or, possibly, by models invoking waves generated by particle-magnetic field interactions in the Galaxy.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 280; L13-L17
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Post-launch data analysis for the cosmic ray isotope experiment ONR-604 in the Combined Release and Radiation Effects Satellite (CRRES) (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Research was continued on the origins, acceleration mechanisms, and the propagation modes of the hierarchy of energetic charged particles found in a wide range of astrophysical settings, extending from the cosmic rays arriving from the depth of the galaxy to the energetic particles in the heliosphere and in the near earth environment. In particular this grant has been a vital support in the investigation of the particle radiations in the earth's magnetosphere. The ONR-604 instrument was launched in July 1990 aboard the CRRES spacecraft. The CRRES mission has been a joint program of NASA and the U.S. Air Force Space Test Program which has provided launch support and telemetry coverage. The spacecraft was placed into a low-inclination eccentric orbit with a period of approximately 10 hours, and thus measured charged particle fluxes in both interplanetary space and in the earth's trapped radiation. ONR-604 performed extremely well, both in interplanetary space and in the intense radiation belt environment. We were able to make detailed measurements of interplanetary fluxes and composition into L=4, or for more than 50% of the orbital period. Thus the experiment produced two valuable datasets, one set outside of L=4 for interplanetary studies, and one set inside of L=4 for radiation belt studies. The data returned by the University of Chicago ONR-604 instrument has been the base for 10 papers on magnetospheric and galactic energetic-particle research.
    Keywords: SPACE RADIATION
    Type: NASA-CR-199450 , NAS 1.26:199450
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    The source abundances of galactic cosmic rays (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The galactic cosmic ray source abundances have been determined from two complete datasets, one at low and the other at high energy. For both exponential and truncated exponential pathlength distributions (PLD), the two sets of source abundances show significant differences for the primary elements, i.e., the Fe/O ratio. An energy dependent PLD reduces but does not eliminate the discrepancy, and this may indicate an energy dependence in the source composition. New source abundances for Na, P, Cl, Ca, and Mn are derived.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Jul 13, 1981 - Jul 25, 1981; Paris; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The energy dependence of cosmic ray propagation at low energy (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The interstellar propagation of cosmic rays is investigated using current 'best estimates' for the partial and total cross sections and their energy dependence and the current model of solar modulation. The experimental boron to carbon ratio is reproduced if the mean of the path length distribution decreases with decreasing energy below approximately 1 GeV/nucleon. This energy dependence is compared to shock acceleration models and dynamical halo models using different galactic wind velocities.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Jul 13, 1981 - Jul 25, 1981; Paris; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    The solar modulation of the anomalous helium component from 1965 to 1980 and from 1 to 23 A.U. (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The modulation of the anomalous He-4 component is investigated both in time and in space from 1 to 23 AU with the spacecraft network of IMP-8, and Pioneers 10 and 11. The times of appearance and disappearance of the anomalous He-4 are determined, and it is found to have a higher sensitivity to modulation both in time and space than cosmic ray protons and helium of equivalent or lower rigidity. The disappearance of the flux due to modulation progressed radially outward over several months suggests that the source lies in the outer heliosphere, probably beyond 25 AU, and possibly out of the ecliptic.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Jul 13, 1981 - Jul 25, 1981; Paris; France
    Format: text
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