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  • Other Sources  (95)
  • NASA Technical Reports  (95)
  • METEOROLOGY AND CLIMATOLOGY  (63)
  • INORGANIC AND PHYSICAL CHEMISTRY  (32)
  • Cell & Developmental Biology
  • 1980-1984  (95)
  • 1955-1959
  • 1935-1939
  • 1980  (95)
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  • Other Sources  (95)
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  • NASA Technical Reports  (95)
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  • 1980-1984  (95)
  • 1955-1959
  • 1935-1939
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  • 1
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    Eddy diffusion coefficients and the variance of the atmosphere 30-60 km (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The results of numerical models or of new observational programs are checked by comparing them with past observations. In view of the differing analysis techniques or differing data samples, the eddy diffusivities presented here agree remarkably well with past estimates. However, in the application of K-values to two-dimensional models, the actual magnitude of the diffusivities is no more important than their spatial patterns, i.e., their gradients with height and latitude. It should thus be noted that the present patterns are often much different from those of past results.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Pure and Applied Geophysics; 118; 5, 19; 1980
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  • 2
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    Determination of the complex refractive index and size distribution of atmospheric particulates from bistatic-monostatic lidar and solar radiometer measurements (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A method is presented for inferring both the size distribution and the complex refractive index of atmospheric particulates from combined bistatic-monostatic lidar and solar radiometer observations. The basic input measurements are spectral optical depths at several visible and near-infrared wavelengths as obtained with a solar radiometer and backscatter and angular scatter coefficients as obtained from a biostatic-monostatic lidar. The spectral optical depth measurements obtained from the radiometer are mathematically inverted to infer a columnar particulate size distribution. Advantage is taken of the fact that the shape of the size distribution obtained by inverting the particulate optical depth is relatively insensitive to the particle refractive index assumed in the inversion. Bistatic-monostatic angular scatter and backscatter lidar data are then processed to extract an optimum value for the particle refractive index subject to the constraint that the shape of the particulate size distribution be the same as that inferred from the solar radiometer data. Specifically, the scattering parameters obtained from the bistatic-monostatic lidar data are compared with corresponding theoretical computations made for various assumed refractive index values. That value which yields best agreement, in a weighted least squares sense, is selected as the optimal refractive index estimate. The results of this procedure applied to a set of simulated measurements as well as to measurements collected on two separate days are presented and discussed.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Geophysical Research; 85; Mar. 20
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  • 3
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    A spectroscopic study of intermediates in the condensation of refractory smokes: Matrix isolation experiments SiO (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The infrared and Raman spectra of N2 matrix isolated silicon oxides are investigated. The vibrational frequencies of SiO, Si2O2, and Si3O3 were identified and assigned on the basis of normal coordinate analyses. Heating the solid to 50 K (evaporating the matrix) leaves a residue whose infrared spectrum is identical to that of a smoke condensed at ambient temperatures. Further heating of the sample to 500 K leads to significant changes in the band shapes. Investigations of the infrared spectra at several stages of the diffusion process result in the proposal of a mechanism for the transition from molecular properties to those of the residue (bulk) material, which is characterized as Si2O3.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-TM-81128
    Format: application/pdf
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  • 4
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    Global Atmospheric Sampling Program (GASP) (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Washington Upper Atmosphere Res. Program; p 65-66
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  • 5
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    Spatial and temporal variations in atmospheric N2O and halocarbon concentrations (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Washington Upper Atmosphere Res. Program; p 56-58
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  • 6
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    Longterm monitoring of ambient nitrous oxide and the halogens (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Washington Upper Atmosphere Res. Program; p 54-55
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  • 7
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    Estimating probabilities of cloud-free fields-of-view from the earth through the atmosphere (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper is an extension of previous papers by Lund and Shanklin (1972, 1973). It presents probabilities of cloud-free fields-of-view (CFFOV) to supplement probabilities of cloud-free lines-of-sight (CFLOS) contained in the earlier papers. A model is developed for estimating the probability of obtaining a CFFOV as a function of ground-observer-reported total sky cover for earth-to-space applications. The development of the model and examples of its application are described. A comparison of CFFOV and CFLOS results is made. In conclusion, climatic probabilities of CFFOV overhead through the entire atmosphere between the surface of the earth and space can be estimated for any desired geographical location through the use of a specified equation and conditional probabilities contained in the paper, if the frequency distribution of total sky cover categories for the desired location is known.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: AD-A086320 , AFGL-TR-80-0183 , Journal of Applied Meteorology; 19; Apr. 198
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  • 8
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    Absorption and resonance Raman spectra of Pb2, Pb3 and Pb4 in xenon matrices (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Lead metal was vaporized and trapped in solid xenon at 12K. Electronic absorption and resonance Raman spectra were recorded of the resulting matrix, which was shown to contain Pb2, Pb3, and possibly Pb4 molecular species. The vibrational frequency for Pb2 is determined to be 108/cm for the ground state, with a dissociation energy of 82000/cm. Ad3h symmetry is indicated for the Pb3 species, with nu sub 1=117/cm and nu sub 2 = 96 /cm. The existence of Pb4 is suggested by a fundamental and overtone of 111/cm spacing.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-163428
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  • 9
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    Investigation of the free flow electrophoretic process (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effects of gravity on the free flow electrophoretic process was demonstrated. The free flow electrophoresis chamber used to demonstrate the effects of gravity on the process was of a proprietary design. This chamber was 120 cm long, 16 cm wide, and 0.15 cm thick. Flow in this chamber was in the upward direction and exited through 197 outlets at the top of the chamber. During electrophoresis a stream of sample was injected into the flow near the bottom of the chamber and an electrical field was applied across the width of the chamber. The field caused a lateral force on particles in the sample proportional to the inherent change of the particle and the electric field strength. Particle lateral velocity was then dependent on the force due to viscous drag which was proportional to particle size and particle shape dependent.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-161523 , MDC-E2275
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  • 10
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    The washout of combustion-generated hydrogen chloride (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The coefficient for the washout from a rocket exhaust cloud of HCl generated by the combustion of an ammonium perchlorate-based solid rocket propellant such as that to be used for the Space Shuttle Booster is determined. A mathematical model of HCl scavenging by rain is developed taking into account rain droplet size, fall velocity and concentration under various rain conditions, partitioning of exhaust HCl between liquid and gaseous phases, the tendency of HCl to promote water vapor condensation and the concentration and size of droplets within the exhaust cloud. The washout coefficient is calculated as a function of total cloud water content, total HCl content at 100% relative humidity, condensation nuclei concentration and rain intensity. The model predictions are compared with experimental results obtained in scavenging tests with solid rocket exhaust and raindrops of different sizes, and the large reduction in washout coefficient at high relative humidities predicted by the model is not observed. A washout coefficient equal to 0.0000512 times the -0.176 power of the mass concentration of HCl times the 0.773 power of the rainfall intensity is obtained from the experimental data.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Atmospheric Environment; 14; 9, 19; 1980
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