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All Library Books, journals and Electronic Records Telegrafenberg

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  • 1
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    Network for the Detection of Stratospheric Change (NDSC) FTIR Intercomparison at Table Mountain Facility, November 1996 (2000)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: An intercomparison of four Fourier Transform Infrared (FTIR) spectrometers, operated side by side by JPL, NCAR, and NPL groups, using two different spectral fitting algorithms, was conducted at JPL's Table Mountain Facility (TMF) during November 1996.
    Keywords: Geophysics
    Type: Journal of Geophysical Research (Atmospheres)
    Format: text
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  • 2
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    Electrodeless discharge lamp is easily started, has high stability (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Electrodeless discharge borosilicate glass lamp is used in various high-resolution optical systems. It is partially charged with krypton, contains small amounts of rubidium, and is enclosed in a hermetically sealed envelope that maintains the lamp at an optimum temperature during discharge. The lamp is quickly started by its excitation coil.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: WOO-030
    Format: application/pdf
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  • 3
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    Synthesis and evaluation of electroactive CO2 carriers (1988)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The development of redox CO2 carrier molecules capable of binding CO2 and releasing it will provide a basis for efficient CO2 removal system for possible applications on long-duration manned space missions. The objective of research being conducted is the utilization of these carriers to develop membranes to selectively and efficiently pump CO2 when a potential is applied across the membranes. The topics covered include the effects of pumping rate and CO2 solubility on carrier efficiency, chemical requirements of redox active carriers, and the screening and evaluation of potential carriers.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 881078
    Format: text
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  • 4
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    Measurements of reactive gaseous rocket injector admittances (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The paper describes the results of an experimental study of the quantitative determination of the capabilities of the combustion processes associated with coaxial gaseous propellant rocket injectors to drive combustor pressure oscillations. The data, obtained by employing the modified impedance tube technique with compressed air as the oxidizer and acetylene gas as the fuel, describe the frequency dependence of the admittance of the combined injector-combustion process. The measured data are compared with the predictions of the Feiler and Heidmann analytical model utilizing different values for the characteristic combustion time tau sub b. The values of tau sub b which result in a best fit between the measured and predicted data are indicated for different equivalence ratios. It is shown that for the coaxial injector investigated in this study the tau sub b varies between 0.7 and 1.2 msec for equivalence ratios in the range of 0.57 to 1.31. In addition, the experimental data indicate that the tested injector system could drive combustion instabilities over a frequency range that is in qualitative agreement with the predictions of the Feiler and Heidmann model.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Combustion Science and Technology; 20; 5-6,; 1979
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  • 5
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    Improved fuel cell (1977)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Concept in fuel cell design has two cells, each with its own reactant flow fields bonded into single modular unit. Cells require fewer parts and occupy less space than conventional fuel cells, effecting easier assembly and maintenance.
    Keywords: PHYSICAL SCIENCES
    Type: MFS-23797 , NASA Tech Briefs (ISSN 0145-319X); 2; 4; P. 3
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  • 6
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    Experimental determination of three-dimensional liquid rocket nozzle admittances. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The three-dimensional nozzle admittance, an important parameter in combustion instability studies, was experimentally measured for several nozzle configurations. The admittance values were obtained using a modification of the classical impedance tube technique. The modified impedance tube method measures the admittance of a duct termination in the presence of one-dimensional mean flow and three-dimensional oscillations. Values of the nozzle admittance were obtained from pressure amplitude measurements taken at discrete points along the length of the tube. To determine the effects of nozzle geometry, nozzles were tested with half-angles of 15, 30, and 45 deg and entrance Mach numbers of 0.08, 0.16, and 0.20. The admittance results are presented as functions of nondimensional frequency for mixed first tangential-longitudinal modes. These results are compared with available theoretical predictions, and good agreement between theory and experiment is shown.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: AIAA Journal; 11; Mar. 197
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  • 7
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    Computer program to determine the irrotational nozzle admittance (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Irrotational nozzle admittance is the boundary condition that must be satisfied by combustor flow oscillations at nozzle entrance. Defined as the ratio of axial velocity perturbation to the pressure perturbation at nozzle entrance, nozzle admittance can also be used to determine whether wave motion in nozzle under consideration adds or removes energy from combustor oscillations.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: LEW-12019
    Format: application/pdf
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  • 8
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    Development of advanced fuel cell system, phase 3 (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A multiple task research and development program was performed to improve the weight, life, and performance characteristics of hydrogen-oxygen alkaline fuel cells for advanced power systems. Gradual wetting of the anode structure and subsequent long-term performance loss was determined to be caused by deposition of a silicon-containing material on the anode. This deposit was attributed to degradation of the asbestos matrix, and attention was therefore placed on development of a substitute matrix of potassium titanate. An 80 percent gold 20 percent platinum catalyst cathode was developed which has the same performance and stability as the standard 90 percent gold - 10 percent platinum cathode but at half the loading. A hybrid polysulfone/epoxy-glass fiber frame was developed which combines the resistance to the cell environment of pure polysulfone with the fabricating ease of epoxy-glass fiber laminate. These cell components were evaluated in various configurations of full-size cells. The ways in which the baseline engineering model system would be modified to accommodate the requirements of the space tug application are identified.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-134818 , PWA-5201
    Format: application/pdf
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  • 9
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    Increased fuel-cell cross-pressure limit (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Polytetrafluoroethylene (PTFE) impregnated support screen increases cross pressure on electrolyte-filled matrix in fuel-cell passive water-removed unit. This increases cell operating pressure limit which may improve performance and life characteristics of passive water-removal-type fuel cells.
    Keywords: PHYSICAL SCIENCES
    Type: MFS-25196 , NASA Tech Briefs (ISSN 0145-319X); 4; 4; P. 490
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  • 10
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    The effect of design and operating factors on life and performance of matrix fuel cells Final report (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Design, temperature, carbon dioxide, and current density effects on alkaline hydrogen oxygen fuel cell performance
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-CR-72906 , PWA-4145
    Format: application/pdf
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