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  • GEOPHYSICS  (1,214)
  • STRUCTURAL MECHANICS  (252)
  • 2020-2023
  • 2005-2009
  • 1970-1974  (1,466)
  • 1974  (1,466)
Collection
Keywords
Years
  • 2020-2023
  • 2005-2009
  • 1970-1974  (1,466)
Year
  • 1
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    Earth Resources: A continuing bibliography with indexes, issue 1 (1974)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This bibliography lists 616 reports, articles, and other documents introduced into the NASA scientific and technical information system between January 1974 and March 1974. Emphasis is placed on the use of remote sensing and geophysical instrumentation in spacecraft and aircraft to survey and inventory, natural resources and urban areas. Subject matter is grouped according to agriculture and forestry, environmental changes and cultural resources, geodesy and cartography, geology and mineral resources, oceanography and marine resources, hydrology and water management, data processing and distribution systems, instrumentation and sensors, and economic analysis.
    Keywords: GEOPHYSICS
    Type: NASA-SP-7041(01)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Graphic arts techniques and equipment: A compilation (1974)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Technology utilization of NASA sponsored projects involving graphic arts techniques and equipment is discussed. The subjects considered are: (1) modification to graphics tools, (1) new graphics tools, (3) visual aids for graphics, and (4) graphic arts shop hints. Photographs and diagrams are included to support the written material.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-5919(02)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Arbitrarily Curved and Twisted Space Beams (1974)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: A derivation of the equations which govern the deformation of an arbitrarily curved and twisted space beam is presented. These equations differ from those of the classical theory in that (1) extensional effects are included; (2) the strain-displacement relations are derived; and (3) the expressions for the stress resultants are developed from the strain displacement relations. It is shown that the torsional stress resultant obtained by the classical approach is basically incorrect except when the cross-section is circular. The governing equations are given in the form of first-order differential equations. A numerical algorithm is given for obtaining the natural vibration characteristics and example problems are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-72185
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Remote Sensing of Ocean Current Boundary Layer (1974)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10728 , NASA-CR-139574 , MPR-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    The United States earth resources survey program and ERTS experiments benefit highlights (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: With the launch of the first Earth Resources Technology Satellite in July 1972 a major new tool has become available for decision making in the assessment, exploitation, and management of the earth's resources on a national and international basis. The current status of the earth resources survey program is discussed and the future potential is reviewed. The supportive roles of all stages of the system, including surface, aircraft, and satellite components are noted. Specific cases of application of ERTS data are presented together with a discussion of benefits that might accrue. Need for cooperative, coordinated efforts between participants is emphasized.
    Keywords: GEOPHYSICS
    Type: AIAA PAPER 74-249 , Annual Meeting and Technical Display; Jan 28, 1974 - Jan 30, 1974; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Buckling analysis for anisotropic laminated plates under combined inplane loads (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The buckling analysis presented considers rectangular flat or curved general laminates subjected to combined inplane normal and shear loads. Linear theory is used in the analysis. All prebuckling deformations and any initial imperfections are ignored. The analysis method can be readily extended to longitudinally stiffened structures subjected to combined inplane normal and shear loads.
    Keywords: STRUCTURAL MECHANICS
    Type: IAF PAPER 74-038
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Application of variational and Galerkin equations to linear and nonlinear finite element analysis (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The paper discusses the application of the variational equation to nonlinear finite element analysis. The problem of beam vibration with large deflection is considered. The variational equation is shown to be flexible in both the solution of a general problem and in the finite element formulation. Difficulties are shown to arise when Galerkin's equations are used in the consideration of the finite element formulation of two-dimensional linear elasticity and of the linear classical beam.
    Keywords: STRUCTURAL MECHANICS
    Type: IAF PAPER 74-026
    Format: text
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  • 8
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    X-rays from an auroral substorm at altitudes of 60-80 km and 15-20 km (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A technique for the measurement of high altitude X-rays associated with auroral events is described. The instrument package is boosted to the lower D region by a rocket and descends slowly by parachute. This arrangement facilitates coordination with the launching of other rocket probes during events of interest. A flight on Feb. 2, 1973 from the Churchill Research Range provided 17 minutes of X-ray data above 28 km. The flight was made into an intense break-up event and X-ray fluxes were observed during two episodes of the explosive phase. The reduction of auroral absorption during the later phases of the event suggests precipitation of energetic electrons unaccompanied by the lower energy precipitation responsible for the absorption earlier in the substorm.
    Keywords: GEOPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Ion composition during the formation of a mid-latitude Es layer (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The positive ion composition within a mid-latitude sporadic E layer has been measured with the aid of a rocketborne ion mass spectrometer launched from El Arenosillo, Spain on July 3, 1972 at 0743 LMT. Ionograms taken before and during the rocket flight showed a developing sporadic E layer near 114 km. Rocket data showed peaks in electron density and metallic ions at this same height. Both the maximum and total content of the metals are observed to be greater on the downleg than on the upleg measurement.
    Keywords: GEOPHYSICS
    Format: text
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  • 10
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    Recent results from satellite beacon measurements (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A review is made of the techniques for measuring ionospheric electron content, the most important parameter in the study of transionospheric propagation. Data collected since 1964 have yielded a synoptic description of the behavior of the electron content in mid-latitudes. Empirical relationships between the level of solar activity and the electron content have been developed permitting the prognostication of the electron content values. Marked discrepancies between prognostication and observation which occur during ionospheric storms are being studied to identify their causes. Electron content bite-outs during solar eclipses fall off with distance from totality more rapidly than simple theory predicts suggesting the action of eclipse induced neutral winds. Gravity waves propagating in the thermosphere leave a signature in the electron content records. Studies of such records have allowed the identification of the position of the gravity wave source, and its radiation pattern.
    Keywords: GEOPHYSICS
    Format: text
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