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  • Other Sources  (11)
  • 1975-1979  (5)
  • 1970-1974  (6)
  • 1
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    Experiments with a CO2 gas-dynamic laser (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Carbon dioxide gas dynamic layer in shock tube facility, measuring shape, time, output energy, beam diameter, etc
    Keywords: MASERS
    Type: ; 459 (
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  • 2
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    Importance of nozzle geometry to high-pressure gas-dynamic lasers. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: MASERS
    Type: Applied Physics Letters; 21; Aug. 1
    Format: text
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  • 3
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    Artificial laser intensity oscillations associated with beam splitters. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Investigation of the interference-fringe jitter, due to wavelength instability in a laser, that gives rise to pulse-shape blurring intensity variations. The obtained results suggest that the problem can be controlled by using a perfectly flat splitter, or more easily by using a large-angle wedged splitter that either casts many fringes upon the detector element or casts none if the detector is sufficiently far from the splitter.
    Keywords: MASERS
    Type: Applied Optics; 11; June 197
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  • 4
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    A high-pressure carbon dioxide gasdynamic laser (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A carbon dioxide gasdynamic laser was operated over a range of reservoir pressure and temperature, test-gas mixture, and nozzle geometry. A significant result is the dominant influence of nozzle geometry on laser power at high pressure. High reservoir pressure can be effectively utilized to increase laser power if nozzle geometry is chosen to efficiently freeze the test gas. Maximum power density increased from 3.3 W/cu cm of optical cavity volume for an inefficient nozzle to 83.4 W/cu cm at 115 atm for a more efficient nozzle. Variation in the composition of the test gas also caused large changes in laser power output. Most notable is the influence of the catalyst (helium or water vapor) that was used to depopulate the lower vibrational state of the carbon dioxide. Water caused an extreme deterioration of laser power at high pressure (100 atm), whereas, at low pressure the laser for the two catalysts approached similar values. It appears that at high pressure the depopulation of the upper laser level of the carbon dioxide by the water predominates over the lower state depopulation, thus destroying the inversion.
    Keywords: MASERS
    Type: NASA-TN-D-7471 , A-4993
    Format: application/pdf
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  • 5
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    Experiments on the large-scale structure of turbulence in the near-jet region (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The near region of an axisymmetric, turbulent jet was investigated. Turbulence quantities, as well as mean velocities, were measured between 3 and 23 diam away from the nozzle. The mean velocity profiles were similar over most of this distance, whereas the turbulence quantities were far from equilibrium conditions. Across the jet, the rate of large-scale turbulence varied considerably; however, a Strouhal number based on local velocity, the diameter of the jet, and the frequency of the large-scale turbulent oscillation remained relatively constant. The formation of the initial instability waves and the pairing of the vortices were examined. Turbulent fluctuations were observed only downstream of the pairing process.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-78567 , A-7756
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  • 6
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    Negative and positive cesium ion studies (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Mass spectrometric analyses have been performed on the positive and negative species from discharges in Cs, He-Cs, and He-H2-Cs mixtures. Sampling was conducted through the electrodes of normal glow discharges and from close-spaced heated-cathode conditions, which approximate a cesium thermionic converter. No negative Cs ions were observed for Cs pressures less than .01 torr. Identified species included Cs(+), Cs2(+), Cs(-), and what appeared to be multiply charged ions. Low-mass negative and positive ions attributed to H2 were observed when an He-H2 mixture was also present in the discharge region.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Applied Physics Letters; 33; Dec. 1
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  • 7
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    Oscillation of laser-beam intensity as observed with beam splitters (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Characteristics of nearly perfectly flat beam splitter for observing laser pulse shapes are discussed. Disadvantages of conventional instruments for observing properties of laser beams are described. Effects of high frequency noise on accuracy of measurement are reported.
    Keywords: PHYSICAL SCIENCES
    Type: ARC-10694
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  • 8
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    Selection and development of small solar thermal power applications (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper discusses the approach of the JPL Point Focusing Thermal and Electric Power Applications Project to selecting and developing applications for point-focusing distributed-receiver solar thermal electric power systems. Six application categories are defined. Results of application studies of U.S. utilities are presented. The economic value of solar thermal power systems was found to range from $900 to $2100/kWe in small community utilities of the Southwest.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: AIAA PAPER 79-1005 , American Institute of Aeronautics and Astronautics, Terrestrial Energy Systems Conference; Jun 04, 1979 - Jun 06, 1979; Orlando, FL
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  • 9
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    Shock wave shapes and surface pressures on hemisphere and cone cylinders in low density hypersonic flow including ablation (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Shock-wave shapes and surface pressures on hemisphere and cone cylinders in low density hypersonic flow including ablation
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-5721 , A-3499
    Format: application/pdf
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  • 10
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    Accelerating the commercialization on new technologies (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is suggested that federal programs for hastening the adoption of alternative energy sources must operate within the free market structure. Five phases of the free market commercialization process are described. Federal role possibilities include information dissemination and funding to stimulate private sector activities within these five phases, and federally sponsored procedures for accelerating commercialization of solar thermal small power systems are considered.
    Keywords: ECONOMICS AND COST ANALYSIS
    Type: ASME PAPER 78-WA/TS-4 , American Society of Mechanical Engineers, Winter Annual Meeting; Dec 10, 1978 - Dec 15, 1978; San Francisco, CA
    Format: text
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