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  • SPACE SCIENCES  (12,837)
  • 1
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    A method for determining optimum re-entry trajectories (1974)
    In:  CASI
    Details
    Publication Date: 2006-04-02
    Description: The Pontryagin Maximum Principle is used to formulate the problem of finding optimum atmospheric vehicular reentry trajectories. The optimization problem is that of minimizing an integral which is a function of the state and control variables. The vehicle's motion is assumed to be influenced by a gravitational force and an aerodynamic force. The problem is formulated and the necessary equations are developed simultaneously for three sets of Euler angles. Computational procedures are suggested so that numerical trajectories may be generated.
    Keywords: SPACE SCIENCES
    Type: Multivariant Function Model Generation; 93 p
    Format: text
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  • 2
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    Vehicle control for fuel optimization (1974)
    In:  CASI
    Details
    Publication Date: 2006-04-02
    Description: The problem of predicting the minimum fuel trajectory for a six degree of freedom vehicle which has a motion characterized by the first order differential equations of translational and rotational dynamics is considered. The thrust direction and center of gravity of the vehicle are assumed to be fixed with respect to the vehicle. Thrust magnitude and the control moment are used as control variables and appear linearly in the equation of motion. Pontryagin's Maximum Principle is used to solve the variational problem. With this formulation, the extremal controls are bang-bang with the exception of the singular case.
    Keywords: SPACE SCIENCES
    Type: Multivariant Function Model Generation; 18 p
    Format: text
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  • 3
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    Space flights and questions of law (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Juridical aspects of space flights and international law are elaborated. Considered are manned orbital space stations, as well as lunar or planetary bases and the international exploration of extraterrestrial resources.
    Keywords: SPACE SCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 170-175
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  • 4
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    Are interstellar flights possible? (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: It is shown that ionic relativistic rockets are most suitable for carrying out interstellar flights in comparison with photonic rockets or nuclear interstellar aircraft. Slow interstellar flights are much more probable than fast flights.
    Keywords: SPACE SCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 154-160
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  • 5
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    Searching for extra-terrestrial civilizations (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The probability of radio interchange with extraterrestrial civilizations is discussed. Difficulties constitute absorption, scattering, and dispersion of signals by the rarified interstellar medium as well as the deciphering of received signals and convergence of semantic concept. A cybernetic approach considers searching for signals that develop from astroengineering activities of extraterrestrial civilizations.
    Keywords: SPACE SCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 83-110
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  • 6
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    Multiplicity of inhabited worlds and the problem of setting up contacts among them (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The numerous planetary systems in our galaxy appear to a high degree of probability to contain some planets with a biosphere similar to earth' environment. The possibility of communicating with those extraterrestrial alien planetary civilizations centers on the high level of technological development that is required to overcome the problem of distance. It is conceivable that advanced civilizations can produce energy at a level of 10 to the 43rd power erg/year and that an artificial biosphere can be developed within the limits of 10 to the 22nd power to 10 to the 23rd power cm.
    Keywords: SPACE SCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 67-78
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  • 7
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    Problem of searching for extra-terrestrial civilizations (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Possible criteria characterizing extraterrestrial civilizations and their detection are: (1) deduction of their existence by evaluating astronomical prerequisites for the development of life in remote planetary systems; (2) detection and communication with extraterrestrial civilizations; and (3) the problem of language and content of information in transmitted signals.
    Keywords: SPACE SCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 62-66
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  • 8
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    Research on development of equations for performance trajectory computation (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A computer program for computing the performance trajectory of spacecraft was developed. An analytical study of a minimum fuel flight for high speed aircraft was conducted. The computer program to compute a minimum time reentry into the atmosphere for an Apollo-type capsule is presented. A technical summary of the minimum fuel problem is provided.
    Keywords: SPACE SCIENCES
    Type: Multivariant Function Model Generation; 34 p
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  • 9
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    Diurnal and seasonal trends in the incidence of Sudden Commencements (SC) and Sudden Impulses SI (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Based on world data for the period 1 January 1955 to 31 December 1968, reports of 894 SC cases and 2152 SI cases were collected. A study was made of the diurnal and seasonal trends in the incidence of their appearances. It is shown that the diurnal trend is pronounced for all events with a maximum at (06-8)h universal time. The diurnal trend for SC in the resultant period is more pronounced. The seasonal trend in incidence of appearances of SC and SI is absent. Thus, geomagnetic disturbances of both SC and SI are monitored by world time. These results lead to the conclusion that the presence or absence of SC and SI during geomagnetic storms is determined not only by the nature of the corpuscular flux, the presence of shock waves and tangential discontinuities, but also by purely terrestrial conditions.
    Keywords: SPACE SCIENCES
    Type: in its Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 54-68
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  • 10
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    Study of the moon and planets at the Khar'kov State University Astronomical Observatory (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The results of observations of the moon and planets are presented and include: (1) data on the discovery of high porosity values and the broken terrain of the lunar surface, and (2) data on the coloration of lunar rocks. A comparative description is given of data obtained by astronomical and by satellite observations.
    Keywords: SPACE SCIENCES
    Type: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 29-43
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