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  • Other Sources  (45)
  • 2005-2009  (20)
  • 1990-1994  (20)
  • 1980-1984
  • 1965-1969  (5)
  • 1930-1934
  • 2009  (20)
  • 1990  (20)
  • 1966  (5)
  • 1
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    Recent experiments on muonium (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Muonium chemistry and measurement of hyperfine structure of muonium in ground state
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
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    NASA TECHNICAL REPORTS
  • 2
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    Wide-angle astrometry with the Mark III stellar interferometer (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Astrometric measurements made with the Mark III stellar interferometer on five nights in August-September 1988 yielded average formal 1-sigma errors for 12 FK5 stars of 6 mas in declination and 10 mas in right ascension. This improvement in precision over previously reported measurements with this instrument made in 1986 is attributable to several factors: a second 12 m baseline; oriented E-S, was added to the instrument to improve the determination of right ascension; two-color analysis was included in the data-reduction process, along with a new central-fringe identification algorithm using three spectral channels, in order to reduce atmospheric errors; thermal control was greatly improved; and changes were made to observational procedures and hardware to monitor variations in the delay offset due to residual thermal drifts. Approximately half of the new positions are within 50 mas of their FK5 positions. However, an extended series of measurements are needed to ascertain the accuracy that can be achieved by interferometry.
    Keywords: ASTRONOMY
    Type: Astronomical Journal (ISSN 0004-6256); 100; 1701-171
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    NASA TECHNICAL REPORTS
  • 3
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    World-wide interactive access to scientific databases via satellite and terrestrial data network (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: In order to demonstrate the possibilities for scientific networking and data transfer, a first temporary satellite network link was installed between Czecholovakia and the European space operations center in Darmstadt, during the meeting of the inter-agency consultative group for space science in Prague. Several experiments to show interactive nature of the facility and the capability of the system were carried out, and it was proven that, despite the temporary nature of the installation, the planned demonstrations could be conducted in real time. Demonstrations included electronic mail message, orbit prediction and solar X-ray data. The results of the experiment provided insight into possibilities of data exchange.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: ESA Bulletin (ISSN 0376-4265); 61, Fe; 63-69
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    NASA TECHNICAL REPORTS
  • 4
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    The Lyttleton-Bondi Universe and Charge Equality (1966)
    In:  CASI
    Details
    Publication Date: 2013-08-16
    Description: Theoretical arguments on electron and proton charge magnitude equality
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA. GODDARD INST. FOR SPACE STUDIES LECTURES ON GRAVITATION AND RELATIVITY, VOL. 2 〈1966〈 (SEE N68-14304 05-23)
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    NASA TECHNICAL REPORTS
  • 5
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    CLEAR: Automating control centers with expert system technology (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Communications Link Expert Assistance Resource (CLEAR) is a fault-isolation expert system to be utilized in the operational environment of the Cosmic Background Explorer (COBE) Mission Operations Room (MOR). CLEAR will assist the COBE Flight Operations Team (FOT) during periods of real-time data acquisition by isolating faults in the spacecraft communication link with the Tracking and Data Relay Satellite (TDRS), providing advice on how to correct them, and logging the events for post-pass evaluation. After a brief introduction to the problem domain, the system requirements, tool selection, development approach, system operation and lessons learned during the transformation of the system from the prototype to the delivered, operation system are described.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA, Lyndon B. Johnson Space Center, Third Annual Workshop on Space Operations Automation and Robotics (SOAR 1989); p 289-293
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    NASA TECHNICAL REPORTS
  • 6
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    Space Shuttle Flight Support Motor no. 1 (FSM-1) (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Space Shuttle Flight Support Motor No. 1 (FSM-1) was static test fired on 15 Aug. 1990 at the Thiokol Corporation Static Test Bay T-24. FSM-1 was a full-scale, full-duration static test fire of a redesigned solid rocket motor. FSM-1 was the first of seven flight support motors which will be static test fired. The Flight Support Motor program validates components, materials, and manufacturing processes. In addition, FSM-1 was the full-scale motor for qualification of Western Electrochemical Corporation ammonium perchlorate. This motor was subjected to all controls and documentation requirements CTP-0171, Revision A. Inspection and instrumentation data indicate that the FSM-1 static test firing was successful. The ambient temperature during the test was 87 F and the propellant mean bulk temperature was 82 F. Ballistics performance values were within the specified requirements. The overall performance of the FSM-1 components and test equipment was nominal.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-CR-184078 , NAS 1.26:184078 , TWR-50068 , PUBL-910801
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    NASA TECHNICAL REPORTS
  • 7
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    A parametric shell analysis of the shuttle 51-L SRB AFT field joint (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Following the Shuttle 51-L accident, an investigation was conducted to determine the cause of the failure. Investigators at the Langley Research Center focused attention on the structural behavior of the field joints with O-ring seals in the steel solid rocket booster (SRB) cases. The shell-of-revolution computer program BOSOR4 was used to model the aft field joint of the solid rocket booster case. The shell model consisted of the SRB wall and joint geometry present during the Shuttle 51-L flight. A parametric study of the joint was performed on the geometry, including joint clearances, contact between the joint components, and on the loads, induced and applied. In addition combinations of geometry and loads were evaluated. The analytical results from the parametric study showed that contact between the joint components was a primary contributor to allowing hot gases to blow by the O-rings. Based upon understanding the original joint behavior, various proposed joint modifications are shown and analyzed in order to provide additional insight and information. Finally, experimental results from a hydro-static pressurization of a test rocket booster case to study joint motion are presented and verified analytically.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-102748 , NAS 1.15:102748
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    NASA TECHNICAL REPORTS
  • 8
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    Spectral determinations for discrete sources with EGRET (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The ability of the EGRET (Energetic Gamma-Ray Experimental Telescope) to determine the spectral parameters of point sources in 14-day exposures, as planned for the initial survey phase of the GRO (Gamma Ray Observatory) mission, is explored by numerical simulation. Results are given for both galactic and extragalactic objects as a function of source strength and for representative levels of diffuse background emission.
    Keywords: ASTRONOMY
    Type: NASA, Goddard Space Flight Center, The Energetic Gamma-Ray Experiment Telescope (EGRET) Science Symposium; p 201-213
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    NASA TECHNICAL REPORTS
  • 9
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    Development of passive temperature control coatings for use on the Apollo vehicle ablative thermal protection system Final report (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Passive temperature control coatings for Apollo spacecraft ablative thermal protection system
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-CR-65366 , AVSSD-0012-66-RR
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    NASA TECHNICAL REPORTS
  • 10
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    Coherent neutron proton-hole excitations in nuclei (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-30
    Description: Coherent neutron proton-hole excitations in zirconium 90 and yttrium 90
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Format: text
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    NASA TECHNICAL REPORTS
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