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  • GEOPHYSICS  (40)
  • INSTRUMENTATION AND PHOTOGRAPHY  (6)
  • OCEANOGRAPHY  (5)
  • Conductance  (4)
  • 1
    Electronic Resource
    Electronic Resource
    The conductance of bile salt-lecithin-water mixtures (1972)
    Springer
    Journal of solution chemistry 1 (1972), S. 377-386 
    Details
    ISSN: 1572-8927
    Keywords: Conductance ; aqueous solutions ; sodium glycodeoxycholate ; sodium taurodeoxycholate ; lecithin ; bile salts ; micelles ; gallbladder ; cholesterol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The conductance of aqueous solutions of sodium glycodeoxycholate and sodium taurodeoxycholate displays a complex concentration dependence (0–0.5 C) with a maximum and minimum occurring in dilute solutions. This behavior can be related to physiologic concentrations observed in hepatic and gallbladder bile and interpreted in terms of anion dimerization and ultimately micellization. The addition of lecithin in 1:2 or 1:5 molar ratios results in micellization at lower concentration, disappearance of the maximum and minimum in the conductance curve, and a decrease in the total conductance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00715995
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The conductance of cyclic polyether-cation complexes (1972)
    Springer
    Journal of solution chemistry 1 (1972), S. 499-506 
    Details
    ISSN: 1572-8927
    Keywords: Conductance ; cyclic polyethers ; association constants ; alkali metals ; polyether ; cation complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Precise conductance measurements are reported for sodium, potassium, and cesium salts in methanol and acetonitrile solutions containing cyclic polyethers dibenzo-18-crown-6 and dicyclohexyl-18-crown-6. Decreases in equivalent conductance caused by the addition of a cyclic polyether to solutions of constant ionic strength were analyzed by nonlinear least squares to give association constants and equivalent conductances of the cation-polyether complex. The selectivity observed for the complexing is a function not only of ionic size but also of solvent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651726
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The conductance of electrolytes in acetone-2-propanol and acetone-1,1,1,3,3,3-hexafluoro-2-propanol mixtures at 25°C1 (1975)
    Springer
    Journal of solution chemistry 4 (1975), S. 413-430 
    Details
    ISSN: 1572-8927
    Keywords: Conductance ; density ; viscosity ; dielectric constants ; tetrabutylammonium chloride, bromide, iodide, and perchlorate ; LiCl ; acetone ; 2-propanol ; 1,1,1,3,3,3-hexafluoro-2-propanol ; ionic association ; solvent structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Precise conductance measurements are reported for tetrabutylammonium chloride, bromide, iodie, and perchlorate and lithium chloride in acetone-2-propanol (2-PrOH) and acetone-1,1,1,3,3,3-hexafluoro-2-propanol (HFP) mixtures at 25°C. Densities, viscosities and dielectric constants of the mixtures were determined. The dielectric constant vs mole % acetone curve for the acetone (ε=19.4)-2-propanol (ε=20.5) goes through a minimum at 40% acetone (ε=17.4), while that for acetone-HFP (ε=16.8) goes through a maximum at 50% acetone (ε=26.87). The variations ofK A with ε in acetone-HFP are in accord with the predictions of electrostatic theory, while those for acetone-2-PrOH show more complex behavior. Ionic association in these mixtures is discussed in terms of an interplay between solvent structure and a multiple-step association process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645574
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  • 4
    Electronic Resource
    Electronic Resource
    The conductance of divalent Ions in H2O at 10 and 25°C and in D2O (1974)
    Springer
    Journal of solution chemistry 3 (1974), S. 757-769 
    Details
    ISSN: 1572-8927
    Keywords: Conductance ; divalent salts ; H2O ; D2O ; ionic association
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Precise conductance measurements are reported for potassiumm-benzenedisulfonate and ferricyanide, for calcium, strontium, barium, and manganese chloride, and for manganese and potassium sulfate in D2O at 25°C. Measurements were also carried out in water at 10 and 25°C for all the salts with the exception of K3Fe(CN)6 at 10°C. Two runs are reported for sodium sulfate in water at 25°C. Limiting conductances of these ions are discussed in terms of solvent structural effects. The association constant for MnSO4 is found to be the same in H2O and D2O.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00955708
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  • 5
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    Cold cathode gage /Lunar atmosphere detector/ (1970)
    In:  CASI
    Details
    Publication Date: 2004-12-06
    Description: Apollo 12 cold cathode gage and lunar atmospheric pressure measurements
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. MANNED SPACECRAFT CENTER APOLLO 12- PRELIM. SCI. REPT. 1 JUN. 1970; P 93-97
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  • 6
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    Lunar orbital mass spectrometer experiment (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A lunar orbital mass spectrometer carried by the Apollo 16 command and service module was used to detect the lunar atmosphere and to search for active lunar volcanism. The experimental procedure and results are described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Apollo 16 Prelim. Sci. Rept.; 6 p
    Format: text
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  • 7
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    Lunar atmospheric composition experiment (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: On the Apollo 17 mission, a miniature mass spectrometer, called the lunar atmospheric composition experiment (LACE), was carried to the moon as part of the Apollo lunar surface experiments package (ALSEP) to study the composition of and variation in the lunar atmosphere. The instrument was successfully deployed in the Taurus-Littrow valley with its entrance aperture oriented upward to intercept and measure the downward flux of gases at the lunar surface. Initial activation of the LACE instrument occurred on December 27, 1972, approximately 50 hr after sunset, and operation continued throughout the first lunar night. Sunrise brought a high background gas level and necessitated discontinuing operation during lunar daytime except for a brief check near noon. Near sunset, operation was resumed and continued throughout the night. This sequence was repeated for the second and third lunations.
    Keywords: GEOPHYSICS
    Type: NASA. Johnson Space Center Apollo 17 Prelim. Sci. Rept.; 9 p
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  • 8
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    Magnetosphere-ionosphere interactions (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: The present understanding of magnetosphere ionosphere interactions is described, and present and future predictive capabilities are assessed. Ionospheric features directly coupled to the magnetosphere to a significant degree are considered, with emphasis given to those phenomena of major interest to forecasters and users.
    Keywords: GEOPHYSICS
    Type: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 476-493
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  • 9
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    Multipolarization radar images for geologic mapping and vegetation discrimination (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: NASA has developed an airborne SAR that simultaneously yields image data in four linear polarizations in L-band with 10-m resolution over a swath of about 10 km. Signal data are recorded both optically and digitally and annotated in each of the channels to facilitate completely automated digital correlation. Comparison of the relative intensities of the different polarizations furnishes discriminatory mapping information. Local intensity variations in like-polarization images result from topographic effects, while strong cross polarization responses denote the effects of vegetation cover and, in some cases, possible scattering from the subsurface. In each of the areas studied, multiple polarization data led to the discrimination and mapping of unique surface unit features.
    Keywords: GEOPHYSICS
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-24; 246-257
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  • 10
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    Low energy electron precipitation and the ionospheric F-region in and north of the auroral zone. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Use of low-elevation sounding rocket (Polar 1) in the exploration of the F region morphology in and north of the auroral zone over northern Norway. The rocket which moved over a horizontal distance of some 400 km inside the F region, monitored low-energy electron precipitation and various upper-atmosphere excitation and ionization processes. The latitudinal variations of the less than 1 keV energy electron fluxes showed excellent agreement with corresponding variations in the F-region electron density and the O I (6300 A) emission below the rocket, indicating that the low-energy electrons are the main sources for these phenomena at these high latitudes. An N2(+) (4278 A) arc was located near the decrease in the 40-keV electron fluxes. This arc was produced by a nearly monoenergetic influx of some 3-keV electrons. The expected luminosity profile derived from this energy spectrum differs significantly from the observed one, and possible explanations for the discrepancy are discussed.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 20; Feb. 197
    Format: text
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