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  • 1
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    The seismic traveltime drop in the Charlevoix region from 1979 to 1980: Evidence for aligned saturated cracks in the crustal material (1985)
    preprint, Dep. of Energy, Mines and Resources, Earth Phys. Branch
    In:  Ottawa, preprint, Dep. of Energy, Mines and Resources, Earth Phys. Branch, vol. 12, no. XVI:, pp. 9-66, (ISBN 0-7923-5587-3)
    Details
    Publication Date: 1985
    Keywords: Earthquake precursor: prediction research ; Dual Induction Latero logAT ; Earthquake precursor: Vp/Vs anomalies
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    A spectroscopic view of Epsilon Aurigae (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Spectroscopic observations from the ultraviolet, visible, and infrared obtained at the recent eclipse are discussed. The rotation curve for the disk around the secondary suggests that secondary is a low mass star (or binary). This result with the known mass function suggests that the primary may be a low mass star leaving the AGB and evolving to the white dwarf region.
    Keywords: ASTROPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Possible identifications of the 3.4 micrometer feature (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A feature at 3.4 micrometer was first detected in Comet Halley by the IKS spectrometer on board the Vega 1 probe; and subsequently from the ground. The feature has since been reported in Comet Wilson. The presence of the feature is of considerable interest for a number of reasons. First, it may represent the detection of a new parent molecule, and when combined with data from Giotto and Vega yield new information on cometary chemistry and the early solar system composition. Secondly, it may represent a link to the interstellar medium, the feature corresponds in wavelength and shape with an interstellar feature seen in absorption in a luminous star, towards the Galactic center known as GC-IRS7. The feature in turn is thought to be related with a growing family of unidentified infrared emission features seen in stellar objects, planetary nebulae, reflection nebulae, HII regions and extra galactic sources. These features occur at wavelengths 3.3, 3.4, 3.5, 6.2, 7.7, 8.6, and 11.25 micrometers. Further identification theory is given.
    Keywords: ASTRONOMY
    Type: NASA, Washington, Infrared Observations of Comets Halley and Wilson and Properties of the Grains; p 86-90
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Simple construction and performance of a conical plastic cryocooler (1985)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Low power cryocoolers with conical displacers offer several advantages over stepped displacers. The described fabrication process allows quick and reproducible manufacturing of plastic conical displacer units. This could be of commercial interest, but it also makes systematic optimization feasible by constructing a number of different models. The process allows for a wide range of displacer profiles. Low temperature performance as dominated by regenerator losses, and several effects are discussed. A simple device is described which controls gas flow during expansion.
    Keywords: ENGINEERING (GENERAL)
    Type: NBS Proc. of the 3rd Cryocooler Conf.; p 119-126
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Design and analysis study of a spacecraft optical transceiver package (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A detailed system level design of an Optical Transceiver Package (OPTRANSPAC) for a deep space vehicle whose mission is outer planet exploration is developed. In addition to the terminal design, this study provides estimates of the dynamic environments to be encountered by the transceiver throughout its mission life. Optical communication link analysis, optical thin lens design, electronic functional design and mechanical layout and packaging are employed in the terminal design. Results of the study describe an Optical Transceiver Package capable of communicating to an Earth Orbiting Relay Station at a distance of 10 Astronomical Units (AU) and data rates up to 100 KBPS. The transceiver is also capable of receiving 1 KBPS of command data from the Earth Relay. The physical dimensions of the terminal are contained within a 3.5' x 1.5' x 2.0' envelope and the transceiver weight and power are estimated at 52.2 Kg (115 pounds) and 57 watts, respectively.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-179958 , JPL-9950-1240 , NAS 1.26:179958
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Computed performance of the half-scale accurate antenna reflector (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The performance of the half-scale, accurate antenna reflector was studied. The antenna is evaluated for use as a compact range reflector. The reflector is studied for use with three separate feed antennas.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-182284 , E-4748 , NAS 1.26:182284
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Observations of Cygnus X-3 above 10(15) eV from 1979 - 1984 (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The ultra high energy gamma-ray source, cygnus X-3, has been observed more or less continuously with an array sensitive to 10 to the 15th power ev primaries between 1 Jan. 1979 and 31 Dec. 1984. There is evidence for time variability in the phase of gamma-ray emission over this period.
    Keywords: SPACE RADIATION
    Type: OG-2.1-6 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 71-74; NASA-CP-2376-VOL-1
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    NASA TECHNICAL REPORTS
  • 8
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    Shower disc sampling and the angular resolution of gamma-ray shower detectors (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: As part of the design study for the new UHE gamma ray detector being constsructed at Haverah Park, a series of experiments using scintillators operated side-by-side in 10 to the 15th power eV air showers are undertaken. Investigation of the rms sampling fluctuations in the shower disc arrival time yields an upper limit to the intrinsic sampling uncertainty, sigma sub rms = (1.1 + or - 0.1)ns, implying an angular resolution capability 1 deg for an inter-detector spacing of approximately 25 m.
    Keywords: SPACE RADIATION
    Type: OG-9.5-2 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 449-452; NASA-CP-2376-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    A new array for the study of ultra high energy gamma-ray sources (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The design and operation of a 32 x 1 10 to the 15th power sq m array of scintillation detectors for the detection of 10 to the 15th power eV cosmic rays is described with an expected angular resolution of 1 deg, thus improving the present signal/background ratio for gamma ray sources. Data are recorded on a hybrid CAMAC, an in-house system which uses a laser and Pockel-Cell arrangement to routinely calibrate the timing stability of the detectors.
    Keywords: SPACE RADIATION
    Type: OG-9.4-7 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 426-429; NASA-CP-2376-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Speckle interferometry of asteroids. I - 433 Eros (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Analytical expressions are derived for the semimajor and semiminor axes and orientation angle of the ellipse projected by a triaxial asteroid, and the results are applied speckle-interferometry observations of the 433 Eros asteroid. The expressions were calculated as functions of the dimensions and pole of the body and of the asterocentric position of the earth and the sun. On the basis of the analytical expressions, the dimensions of 433 Eros are obtained. The light curve from December 18, 1981 is compared to the dimensions to obtain a geometric albedo of 0.156 (+ or - 0.010). A series of two-dimensional power spectra and autocorrelation functions for 433 Eros show that it is spinning in space.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 61; 132-151
    Format: text
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    NASA TECHNICAL REPORTS
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