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  • INSTRUMENTATION AND PHOTOGRAPHY  (70)
  • AIRCRAFT PROPULSION AND POWER  (65)
  • ENERGY PRODUCTION AND CONVERSION
  • Lunar and Planetary Science and Exploration
  • 2005-2009
  • 1975-1979  (174)
  • 1950-1954
  • 1975  (174)
Sammlung
Schlagwörter
Erscheinungszeitraum
  • 2005-2009
  • 1975-1979  (174)
  • 1950-1954
Jahr
  • 1
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    Measurements on the development of cascades in a tungsten-scintillator ionization spectrometer (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The response of a tungsten-scintillator ionization spectrometer to accelerated particle beams has been investigated. Results obtained from exposure of the approx. 1000 g/sq cm apparatus to 5, 10, and 15 GeV/c electrons and pions as well as to 2.1 GeV/nucleon C-12 and O-16 ions are presented. These results include cascade-development curves, fractions of the primary energy measured by the spectrometer, and resolutions of the apparatus for measuring the primary energies. For 15 GeV/c electrons, an average of about 82% of the incident energy is measured by the apparatus with resolution (normal standard deviation) of about 6%. For 15 GeV/c pions, an average of about 65% of the incident energy is measured with resolution of about 18%. The energy resolution improves with increasing energy and with increasing depth of the spectrometer.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Nuclear Instruments and Methods; 126; 1975
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    A study of casing treatment stall margin improvement phenomena (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The results of a program of experimental and analytical research in casing treatments over axial compressor rotor blade tips are presented. Circumferential groove, axial-skewed slot and blade angle slot treatments were tested at low speeds. With the circumferential groove treatment the stalling flow was reduced 5.8% at negligible efficiency sacrifice. The axial-skewed slot treatment improved the stalling flow by 15.3%; 1.8 points in peak efficiency were sacrificed. The blade angle slot treatment improved the stalling flow by 15.0%; 1.4 points in peak efficiency were sacrificed. The favorable stalling flow situations correlated well with observations of higher-than-normal surface pressures on the rotor blade pressure surfaces in the tip region, and with increased maximum diffusions on the suction surfaces. Annulus wall pressure gradients, especially in the 50 to 75% chord region, are also increased and blade surface pressure loadings are shifted toward the trailing edge for treated configurations.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: ASME PAPER 75-GT-60 , American Society of Mechanical Engineers, Gas Turbine Conference and Products Show; Mar 02, 1975 - Mar 06, 1975; Houston, TX
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Plastic scintillation counters with an area of 2 sq m (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Two designs of plastic scintillation counters with an area of 2 sq m scanned in each case by a single photomultiplier of the FEU-49 type are described. The radial dependence of their light collection at the place of the path of the detected particle does not exceed 10% while the half width of the differential distribution of the pulse amplitudes from nonfiltered cosmic radiation at sea level is 90 to 95%, and 65%, the plastic thickness being 5 cm and 10 cm, respectively. The temperature coefficient of the counter is 0.32% per 1 C.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Cosmic Rays (NASA-TT-F-807); p 389-393
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    The Solar Backscatter Ultraviolet and Total Ozone Mapping Spectrometer /SBUV/TOMS/ for Nimbus G (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The SBUV/TOMS measures the atmospheric ozone vertical profile and the solar ultraviolet spectrum, and provides a total ozone map by means of a mechanical scan across the Nimbus track. While the SBUV/TOMS instrument has noteworthy design features such as a state-of-the-art double monochromator and fixed optical components on a nonmetallic structure, its most significant characteristic is an optimum system design based on technology proven on the BUV instrument.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Optical Engineering; 14; July-Aug
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 5
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    Low cost silicon solar arrays (1975)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Continuous growth methodology for silicon solar cell ribbons deals with capillary effects, die effects, thermal effects and crystal shape effects. Emphasis centers on the shape of the meniscus at the ribbon edge as a factor contributing to ribbon quality with respect to defect densities. Structural and electrical characteristics of edge defined, film-fed grown silicon ribbons are elaborated. Ribbon crystal solar cells produce AMO efficiencies of 6 to 10%.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: Proc. of the 1st ERDA Semiann. Solar Photovoltaic Conversion Program Conf.; p 104-171
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Interdisciplinary study of atmospheric processes and constituents of the mid-Atlantic coastal region. Attachment 3: Data set for Craney Island oil refinery installation experiment (1975)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Data tables and maps are presented which include background information and experimental data on the Craney Island oil refinery installation experiment. The experiment was to investigate air pollution effects.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-CR-142823
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
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    A preliminary systems-engineering study of an advanced nuclear-electrolytic hydrogen-production facility (1975)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An advanced nuclear-electrolytic hydrogen-production facility concept was synthesized at a conceptual level with the objective of minimizing estimated hydrogen-production costs. The concept is a closely-integrated, fully-dedicated (only hydrogen energy is produced) system whose components and subsystems are predicted on ''1985 technology.'' The principal components are: (1) a high-temperature gas-cooled reactor (HTGR) operating a helium-Brayton/ammonia-Rankine binary cycle with a helium reactor-core exit temperature of 980 C, (2) acyclic d-c generators, (3) high-pressure, high-current-density electrolyzers based on solid-polymer electrolyte technology. Based on an assumed 3,000 MWt HTGR the facility is capable of producing 8.7 million std cu m/day of hydrogen at pipeline conditions, 6,900 kPa. Coproduct oxygen is also available at pipeline conditions at one-half this volume. It has further been shown that the incorporation of advanced technology provides an overall efficiency of about 43 percent, as compared with 25 percent for a contemporary nuclear-electric plant powering close-coupled contemporary industrial electrolyzers.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-CR-144230
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 8
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    In orbit sun calibration performance of Landsat-2 (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Sun calibration data from Landsat-2 are presented and compared with those from Landsat-1 (ERTS-1). The data support the hypothesis that organic contamination caused the poor performance of the Landsat-1 sun calibration mirror, since extra cleanliness precautions were taken with the Landsat-2 mirror. These precautions are described; of particular importance was the aluminum foil covering kept close to the reflective surfaces of the second mirror during the prelaunch period.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Applied Optics; 14; Sept
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 9
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    The University of Iowa Helios solar wind plasma wave experiment /E 5a/ (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: This document describes the University of Iowa solar wind plasma wave experiment for the Helios missions (Experiment 5a). The objective of this experiment is the investigation of naturally occurring plasma instabilities and electromagnetic waves in the solar wind. To carry out this investigation, the experiment consists primarily of a 16-channel spectrum analyzer connected to the electric field antennas. The spectrum analyzer covers the frequency range from 20 Hz to 200 kHz and has an amplitude dynamic range which extends from .3 microvolts/m to 30 mV/m per channel. This spectrum analyzer, the antenna potential measurements, the shock alarm system and the supporting electronics are discussed in detail.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Raumfahrtforschung; 19; Sept
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 10
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    Studies of the use of high-temperature nuclear heat from an HTGR for hydrogen production (1975)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The results of a study which surveyed various methods of hydrogen production using nuclear and fossil energy are presented. A description of these methods is provided, and efficiencies are calculated for each case. The process designs of systems that utilize the heat from a general atomic high temperature gas cooled reactor with a steam methane reformer and feed the reformer with substitute natural gas manufactured from coal, using reforming temperatures, are presented. The capital costs for these systems and the resultant hydrogen production price for these cases are discussed along with a research and development program.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-CR-134919 , GA-A-13391
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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