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  • Other Sources  (61)
  • GEOPHYSICS  (51)
  • STRUCTURAL MECHANICS  (10)
  • Chemical Engineering
  • 2005-2009
  • 1970-1974  (61)
  • 1
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    Artificial auroral experiment - Experiment and principal results (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Artificial auroral experiment by Aerobee rocketborne electron accelerator generated monoenergetic electron beam injection onto magnetospheric field
    Keywords: GEOPHYSICS
    Type: ; 367-414. (
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    NASA TECHNICAL REPORTS
  • 2
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    Perturbation solution of a hyperbolic equation governing longitudinal wave propagation in certain nonuniform bars (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Longitudinal wave propagation in variable section bars, solving hyperbolic equation of motion by perturbation method
    Keywords: STRUCTURAL MECHANICS
    Type: ; YAL SOCIETY (
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    NASA TECHNICAL REPORTS
  • 3
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    Interactive design of large end rings on stiffened conical shells using composites (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Design study methods and results for a composite reinforced base ring for the conical aeroshell structure of the planetary lander vehicle for Project Viking, an unmanned mission to Mars, are presented. The aeroshell is a ring and stringer-stiffened conical shell structure having a half angle of 70 degrees with a large base ring mounted at the outer edge of the cone and a large pay-load ring in the interior with many smaller rings spaced along the inside shell surface. The purpose of the structure is to develop the aerodynamic drag required to decelerate the lander in the Mars atmosphere to facilitiate a soft landing. The design of a shell structure of this complexity requires the use of the latest technology available in a large general-purpose shell buckling program. The large general-purpose non-linear shell buckling program (BOSOR 2) which was used for this purpose is described.
    Keywords: STRUCTURAL MECHANICS
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  • 4
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    Ground pattern analysis in the Great Plains (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: REPT-2266-7 , Kansas Environ. and Resource Study: A Great Plains Model; 7 p
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  • 5
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    Buckling tests of two 4.6-meter-diameter, magnesium ring-stiffened conical shells loaded under external pressure (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Two ring-stiffened magnesium conical shells with a 120 deg apex angle and a 4.6-meter diameter were loaded to failure by a uniform external pressure. The cones differed from one another only in the number of internal stiffening rings. Test specimen details, test procedure, and test results are discussed. Both buckling and prebuckling data are compared with appropriate theoretical predictions. Measured strains in skin and rings agreed well with theoretical predictions. Extensive imperfection measurements were made and reported on both cones in the as fabricated condition.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TN-D-7303 , L-8835
    Format: application/pdf
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  • 6
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    Two successful geomagnetic-field-line tracing experiments. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Two field-line tracing experiments were conducted on an L = 1.26 magnetic flux tube over Kauai, Hawaii. Barium vapor was created by the detonation of a highly explosive shaped charge aligned with the geomagnetic field at a 467-km altitude. Barium ions traveled along the field line to the conjugate ionosphere in a tube 3 to 5 km in diameter, producing a visible streak along the entire 6900-km path length. Electric fields perpendicular to the magnetic field caused the ions to drift away from the true conjugate during transit, but extrapolation from subsequent ion drift rates allowed the conjugate to be identified and compared with several field models. Differing ion drift rates and directions at the conjugate points indicated that the electric field is not transferred unattenuated along field lines.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 77; June 1
    Format: text
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  • 7
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    Observations of fast auroral waves. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results of simultaneous observation of a fast wave event from the Ester Dome Observatory (EDO) near College, Alaska, the Poker Flat Rocket Launching Facility (PKR), and Fort Yukon, Alaska (FYU). The display occurred on Mar. 27, 1971, and the general morphology is described and discussed. It is suggested that fast auroral waves occur when a preceding substorm has enhanced the particle population in the region of the magnetosphere near L = 6 in the midnight sector; then transverse hydromagnetic waves, associated with the onset of further local substorm activity, become visible through their action on this enhanced particle population as they propagate inwards in the equatorial region.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 20; Mar. 197
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  • 8
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    The resolution of temporal and spatial variations in auroral particle measurements from sounding rockets (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The problems involved in the resolution of the temporal/spatial ambiguity in sounding rocket observations are discussed with reference to an experiment involving a mother-daughter rocket combination, together with a flashing light beacon on the rocket and television cameras on the ground. The ambiguity was successfully removed, enabling a proper interpretation of the observations of precipitating low energy electrons to be made.
    Keywords: GEOPHYSICS
    Type: ESRO European Sounding-Rocket and Related Res. at High Latitudes; p 113-118
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  • 9
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    Study of a small magnetospheric substorm (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Data from a rocket launched into the expansion phase of an auroral substorm have been compared with data from numerous ground stations and several space vehicles. It is shown that this magnetic and auroral substorm has most of the features of larger substorms; thus it is implied that the same plasma processes are involved in all substorms. Some evidence is presented to link the auroral breakup with the field lines conjugate to the inner edge of the plasma sheet. The implications of these two results for substorm morphology and the triggering mechanism of the substorm instability are discussed. It is concluded that spatial gradients in plasma temperature are a likely cause.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 79; Apr. 1
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  • 10
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    Tracking air-dropped drogues and dyes from aircraft in support of ERTS-1 circulation studies (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. For two years ERTS-1 has been employed to investigate current circulation patterns in Delaware Bay under different tidal, flow, and wind conditions. Since sufficient numbers of current meters and boats are not available, air-droppable drogues and dye packs have been developed and tested. The drogues consist of a styrofoam float and a line to which is attached a stainless steel biplane. The length of the line determines at what depth currents will be monitored. The floats are color coded to distinguish their movement and mark the depth of the biplanes. Simultaneously floating and anchored dye packs of fluorescein dye have been deployed from aircraft. The movement of the dye and drogues is tracked by sequential aerial photography, using fixed markers on shore or on buoys as reference points to calibrate the scale and direction of drogue movement. The current data obtained by this technique is then used to annotate current circulation maps derived from ERTS-1 imagery.
    Keywords: GEOPHYSICS
    Type: E74-10747 , NASA-CR-139987
    Format: application/pdf
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