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  • 1
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    Double output sensor-transmitter. (1965)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-10
    Beschreibung: Double output transistorized sensor-transmitter for measuring pressure and temperature
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    Stratospheric aircraft exhaust plume and wake chemistry studies (1992)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: This report documents progress to date in an ongoing study to analyze and model emissions leaving a proposed High Speed Civil Transport (HSCT) from when the exhaust gases leave the engine until they are deposited at atmospheric scales in the stratosphere. Estimates are given for the emissions, summarizing relevant earlier work (CIAP) and reviewing current propulsion research efforts. The chemical evolution and the mixing and vortical motion of the exhaust are analyzed to track the exhaust and its speciation as the emissions are mixed to atmospheric scales. The species tracked include those that could be heterogeneously reactive on the surfaces of the condensed solid water (ice) particles and on exhaust soot particle surfaces. Dispersion and reaction of chemical constituents in the far wake are studied with a Lagrangian air parcel model, in conjunction with a radiation code to calculate the net heating/cooling. Laboratory measurements of heterogeneous chemistry of aqueous sulfuric acid and nitric acid hydrates are also described. Results include the solubility of HCl in sulfuric acid which is a key parameter for modeling stratospheric processing. We also report initial results for condensation of nitric acid trihydrate from gas phase H2O and HNO3.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-CR-189688 , NAS 1.26:189688 , ARI-RR-902
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Stratospheric aircraft exhaust plume and wake chemistry (1993)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Progress to date in an ongoing study to analyze and model emissions leaving a proposed High Speed Civil Transport (HSCT) from when the exhaust gases leave the engine until they are deposited at atmospheric scales in the stratosphere is documented. A kinetic condensation model was implemented to predict heterogeneous condensation in the plume regime behind an HSCT flying in the lower stratosphere. Simulations were performed to illustrate the parametric dependence of contrail droplet growth on the exhaust condensation nuclei number density and size distribution. Model results indicate that the condensation of water vapor is strongly dependent on the number density of activated CN. Incorporation of estimates for dilution factors into a Lagrangian box model of the far-wake regime with scale-dependent diffusion indicates negligible decrease in ozone and enhancement of water concentrations of 6-13 times background, which decrease rapidly over 1-3 days. Radiative calculations indicate a net differential cooling rate of the plume about 3K/day at the beginning of the wake regime, with a total subsidence ranging between 0.4 and 1 km. Results from the Lagrangian plume model were used to estimate the effect of repeated superposition of aircraft plumes on the concentrations of water and NO(y) along a flight corridor. Results of laboratory studies of heterogeneous chemistry are also described. Kinetics of HCl, N2O5 and ClONO2 uptake on liquid sulfuric acid were measured as a function of composition and temperature. Refined measurements of the thermodynamics of nitric acid hydrates indicate that metastable dihydrate may play a role in the nucleation of more stable trihydrates PSC's.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-CR-191495 , NAS 1.26:191495 , ARI-RR-1006
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    Design, fabrication and testing of a 5-Hz acoustic exciter system (1973)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A 5-Hz acoustic excitation system was designed, fabricated and checked out for use in the modulation of a stagnant gas volume contained in an absorption cell. A detailed system description of the test equipment, both mechanical and electronic, and an operating procedure are included. Conclusions are also presented.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: NASA-CR-124269 , T1046F
    Format: application/pdf
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  • 5
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    Some recent aircraft measurements of the absorption and scattering of solar radiation by atmospheric aerosol. (1971)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Some previous measurements of the absorption and scattering of solar radiation by particles in the atmosphere are discussed, with particular emphasis on the high observed ratio of absorption to backscatter which is difficult to explain theoretically. Measurements of downward and upward solar radiation fluxes at heights between 1,000 and 40,000 ft on three days during the BOMEX exercise are examined. It is shown that they imply an absorption of 3 to 6% of the radiation which was practically normally incident above that expected from a clean atmosphere, with no corresponding increase in upward scattering.
    Schlagwort(e): GEOPHYSICS
    Materialart: International Conference on Weather Modification; Sep 06, 1971 - Sep 11, 1971; Canberra; Australia
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    Heat flux sensor assembly (1969)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Heat flux sensor assembly with proviso for heat shield to reduce radiative transfer between sensor elements
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
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    Water vapor and methane in the upper stratosphere - An examination of some of the Nimbus 7 measurements (1989)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: The zonal mean volume mixing ratios of water vapor and methane from January to May, 1979, derived from the Nimbus-7 limb IR monitor of the stratosphere and from stratosphere and mesosphere sounder experiments are investigated. The water vapor mixing ratio of air that enters the stratosphere from the troposphere and the yield of water vapor from photochemical oxidation of methane in the stratosphere are examined. The water vapor yield averaged between 1.5 and 2.0, although variability with time and level was relatively large. It is suggested that water vapor yield increases with height in the 16- to 3-mbar range. The average water vapor mixing ratio fo air entering the stratosphere during the study period was about 3.25 X 10 to the -6th.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 94; 8474-848
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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