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  • Other Sources  (13)
  • 1995-1999
  • 1985-1989
  • 1980-1984  (13)
  • 1980  (13)
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  • 1995-1999
  • 1985-1989
  • 1980-1984  (13)
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  • 1
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    Ion beams from laser-generated plasmas (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper describes the space-charge-limited beams produced by the plasma blowoffs generated by 20-MW bursts of 1.06-micron radiation from an active Q-switched Nd:YAG laser. Laser power densities near 10 to the 11th/sq cm on solid targets generate thermalized plasma plumes which drift to a 15-kV gridded extraction gap where the ions are extracted, accelerated, and electrostatically focused; the spatially defined ion beams are then magnetically analyzed to determine the charge state content in the beams formed from carbon, aluminum, copper, and lead targets. This technique preserves time-of-flight (TOF) information in the plasma drift region, which permits plasma ion temperatures and mass flow velocities to be determined from the Maxwellian ion curve TOF shapes for the individual charge species.
    Keywords: PLASMA PHYSICS
    Type: Journal of Applied Physics; 51; Aug. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Scalable standard optical sources in the VUV: Emissions from electron impact on metals (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The use of electron impact on metals in the development of a compact optical standard lamp in the vacuum ultraviolet is described. Two different mechanisms are exploited, transition radiation and bremsstrahlung. Transition radiation will be used as a primary standard from 1200A to 3000A using 10 keV electron impact on tungsten. Bremsstrahlung will be used in the soft X-ray region below 1200A to less than 5A as an optical transfer standard from 4 keV electron impact on tantalum or tungsten.
    Keywords: OPTICS
    Type: NASA-CR-162562
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    MOD-OA 200 kW wind turbine generator engineeringing (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Engineering drawings and the detailed mechanical and electrical design of a horizontal-axis wind turbine designed for DOE at the NASA Lewis Research Center and installed in Clayton, New Mexico are discussed. The drawings show the hub, pitch change mechanism, drive train, nacelle equipment, yaw drive system, tower, foundation, electrical power systems, and the control and safety systems.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-165129 , DOE/NASA/0163-3 , AESD-TME-3053
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Modal identities for elastic bodies, with application to vehicle dynamics and control (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: It is a standard procedure to analyze a flexible vehicle in terms of its vibration frequencies and mode shapes. However, the entire mode shape is not needed per se, but two integrals of the mode shape, pi and hi, which correspond to the momentum and angular momentum in Mode i. Together with the natural frequencies omega-i, these modal parameters satisfy several important identities, 25 of which are derived in this paper. Expansions in terms of both constrained and unconstrained modes are considered. A simple illustrative example is included. The paper concludes with some remarks on the theoretical and practical utility of these results, and several potential extensions to the theory are suggested.
    Keywords: PHYSICS (GENERAL)
    Type: ASME PAPER 79-WA/APM-34
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The use of an active coded aperture for improved directional measurements in high energy gamma-ray astronomy (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The coded aperture, a refinement of the scatter-hole camera, offers a method for the improved measurement of gamma-ray direction in gamma-ray astronomy. Two prototype coded apertures have been built and tested. The more recent of these has 128 active elements of the heavy scintillator BGO. Results of tests for gamma-rays in the range 50-500 MeV are reported and future application in space discussed.
    Keywords: ASTRONOMY
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Characteristics of the telescope for high energy gamma-ray astronomy selected for definition studies on the Gamma Ray Observatory (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The high energy gamma-ray telescope selected for definition studies on the Gamma Ray Observatory provides a substantial improvement in observational capability over earlier instruments. It will have about 20 times more sensitivity, cover a much broader energy range, have considerably better energy resolution and provide a significantly improved angular resolution. The design and performance are described.
    Keywords: ASTRONOMY
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Modal cost analysis for linear matrix-second-order systems (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Reduced models and reduced controllers for systems governed by matrix-second-order differential equations are obtained by retaining those modes which make the largest contributions to quadratic control objectives. Such contributions, expressed in terms of modal data, used as mode truncation criteria, allow the statement of the specific control objectives to influence the early model reduction from very high order models which are available, for example, from finite element methods. The relative importance of damping, frequency, and eigenvector in the mode truncation decisions are made explicit for each of these control objectives: attitude control, vibration suppression and figure control. The paper also shows that using modal cost analysis (MCA) on the closed loop modes of the optimally controlled system allows the construction of reduced control policies which feedback only those closed loop modal coordinates which are most critical to the quadratic control performance criterion. In this way, the modes which should be controlled (and hence the modes which must be observable by choice of measurements), are deduced from truncations of the optimal controller.
    Keywords: CYBERNETICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    MOD-0A 200 kW wind turbine generator design and analysis report (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The design, analysis, and initial performance of the MOD-OA 200 kW wind turbine generator at Clayton, NM is documented. The MOD-OA was designed and built to obtain operation and performance data and experience in utility environments. The project requirements, approach, system description, design requirements, design, analysis, system tests, installation, safety considerations, failure modes and effects analysis, data acquisition, and initial performance for the wind turbine are discussed. The design and analysis of the rotor, drive train, nacelle equipment, yaw drive mechanism and brake, tower, foundation, electricl system, and control systems are presented. The rotor includes the blades, hub, and pitch change mechanism. The drive train includes the low speed shaft, speed increaser, high speed shaft, and rotor brake. The electrical system includes the generator, switchgear, transformer, and utility connection. The control systems are the blade pitch, yaw, and generator control, and the safety system. Manual, automatic, and remote control are discussed. Systems analyses on dynamic loads and fatigue are presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-165128 , DOE/NASA/0163-2 , AESD-TME-3052
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Applications of remote-sensing imagery (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Compilation of reports discusses usefulness of aircraft and satellite data in land-development projects. Landsat and Earth Resources Technology Satellites data are available to general public. Much information on biological, geological, and hydrological features as well as land use can be determined by eye without sophisticated analyzers.
    Keywords: MECHANICS
    Type: MFS-25107 , NASA Tech Briefs (ISSN 0145-319X); 5; 1; P. 71
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Phase changes in liquid face seals (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Computer program predicts boiling (phase change) in liquid face seals. Program determines if and when boiling occurs, and calculates location of boiling interface, pressure and temperature profiles, and load.
    Keywords: MECHANICS
    Type: LEW-12994 , NASA Tech Briefs (ISSN 0145-319X); 4; 3; P. 412
    Format: text
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    NASA TECHNICAL REPORTS
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