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  • Inorganic Chemistry  (3,763)
  • AERODYNAMICS  (2,110)
  • SOLAR PHYSICS  (1,193)
  • SPACE SCIENCES
  • 1975-1979  (7,066)
Collection
Keywords
Publisher
Years
Year
  • 1
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    On wings of circular design (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Prandtl's method of sources and sinks for air foils is used to investigate the aerodynamics of circular wings in constant flow. Lift distribution, total lift, and pitching moment are investigated as well as the influence of changes in the angle of attack.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75505
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Solution of a few nonlinear problems in aerodynamics by the finite elements and functional least squares methods (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The numerical simulation of the transonic flows of idealized fluids and of incompressible viscous fluids, by the nonlinear least squares methods is presented. The nonlinear equations, the boundary conditions, and the various constraints controlling the two types of flow are described. The standard iterative methods for solving a quasi elliptical nonlinear equation with partial derivatives are reviewed with emphasis placed on two examples: the fixed point method applied to the Gelder functional in the case of compressible subsonic flows and the Newton method used in the technique of decomposition of the lifting potential. The new abstract least squares method is discussed. It consists of substituting the nonlinear equation by a problem of minimization in a H to the minus 1 type Sobolev functional space.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75732
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Numerical modeling of stimulation of induced magnetosphere during interaction of solar wind with the ionosphere of Venus (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Electrodynamic processes in the ionopause are examined as well as the structure of the induced magnetosphere.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-75921 , PR-351
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A broad look at solar physics adapted from the solar physics study of August 1975 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The current status of our knowledge of the basic mechanisms involved in fundamental solar phenomena is reviewed. These include mechanisms responsible for heating the corona, the generation of the solar wind, the particle acceleration in flares, and the dissipation of magnetic energy in field reversal regions, known as current sheets. The discussion covers solar flares and high-energy phenomena, solar active regions; solar interior, convection, and activity; the structure and energetics of the quiet solar atmosphere; the structure of the corona; the solar composition; and solar terrestrial interactions. It also covers a program of solar research, including the special observational requirements for spectral and angular resolution, sensitivity, time resolution, and duration of the techniques employed.
    Keywords: SOLAR PHYSICS
    Format: text
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  • 5
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    Solar wind and magnetosphere interactions (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The relationship between the magnetosphere and the solar wind is addressed. It is noted that this interface determines how much of the solar plasma and field energy is transferred to the Earth's environment, and that this coupling not only varies in time, responding to major solar disturbances, but also to small changes in solar wind conditions and interplanetary field directions. It is recommended that the conditions of the solar wind and interplanetary medium be continuously monitored, as well as the state of the magnetosphere. Other recommendations include further study of the geomagnetic tail, tests of Pc 3,4 magnetic pulsations as diagnostics of the solar wind, and tests of kilometric radiation as a remote monitor of the auroral electrojet.
    Keywords: SOLAR PHYSICS
    Type: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 346-364
    Format: text
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  • 6
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    Aircraft icing: Introduction (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The objectives of the Workshop were as follows: (1) to assess the current understanding of fixed wing and rotorcraft operational icing environments and problems (2) to evaluate facilities requirements for R&D and certification purposes (3) to examine means of improving icing forecasts (4) to identify shortcomings in aeronautical icing knowledge which can be alleviated by new research and instrumentation development.
    Keywords: AERODYNAMICS
    Type: NASA. Lewis Res. Center Aircraft Icing; 3 p
    Format: text
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  • 7
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    Effects of long-period solar activity fluctuation on temperature and pressure of the terrestrial atmosphere (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The present state of research on the influence of solar sunspot activity on tropospheric temperature and pressure is reviewed. The existence of an 11-year temperature cycle of 5 different types is affirmed. A cyclic change in atmospheric pressure, deducing characteristic changes between 11-year cycles is discussed. The existence of 80-year and 5-to-6-year cycles of temperature is established, and physical causes for birth are suggested.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-75345
    Format: application/pdf
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  • 8
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    Practical calculation of laminar and turbulent bled-off boundary layers (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Bleed-off of boundary layer material is shown to be an effective means for reducing drag by conserving the laminar boundary layer and preventing separation of the turbulent boundary layer. The case in which the two effects of bleed-off overlap is examined. Empirical methods are extended to the case of bleed-off. Laminar and turbulent boundary layers are treated simultaneously and the approximation differential equations are solved without an uncertain error. The case without bleed-off is also treated.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75328
    Format: application/pdf
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  • 9
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    Effect of the properties of a porous coating on boundary layer stability (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Drawing off gas from the boundary layer is a well-known method for increasing the stability of boundary layers. The increase in stability is primarily connected with a change in the velocity profile form in the case of suction. On the basis of the assumption that the velocity perturbations on a porous slate do not equal zero, the influence of the properties of a permeable surface upon the boundary layer stability were studied.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75235
    Format: application/pdf
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  • 10
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    Experimental studies on the influence of the degree of turbulence and of a turbulence thread on the compressible subsonic flow through flat compressor cascades (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The measurements revealed that at low Reynolds numbers the profile loss is considerably reduced both by the increased degree of turbulence and by a turbulence thread, while it is somewhat increased at high Reynolds numbers, and that a profile loss reduction is connected with an increase in deflection and in pressure shift. The turbulence generator is most effective on the one hand in the middle of the operating range of the cascades, and on the other at very high Mach numbers together with a large angle of incidence.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75276
    Format: application/pdf
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