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  • PHYSICS (GENERAL)  (2)
  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (1)
  • 2015-2019
  • 1975-1979  (3)
  • 1960-1964
  • 1950-1954
  • 1976  (3)
  • 1
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    In:  Other Sources
    Publication Date: 2011-08-16
    Description: Comparative radiation hazards due to various sources of radiation in several prominent manned space missions are surveyed, along with techniques for coping with the hazards. Cosmic radiation of solar and galactic origin, and Van Allen belt radiation, are the major hazards outside the earth's geomagnetic shield, and were a major problem in the Apollo missions. The Skylab missions, while within the geomagnetic field, were subject to extensive exposure to the trapped radiation belts (Van Allen belts), while the Soyuz-Apollo test project involved orbiting at a lower altitude, with lower exposure. No solar particle bursts affected Apollo missions, and the Solar Particle Alert Network devised to help cope with the problem is described. Dosimetry practices and devices are described. Radiation experience and dose readings logged with the various missions are reported.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
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  • 2
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    Publication Date: 2011-08-16
    Description: Without any reference to the theory of differential equations, the initial value problem of the nonlinear, nonconservative double pendulum system is solved by the application of the method of Ritz to the equation of Hamilton. Also shown is an example of the reduction of the traditional eigenvalue problem of linear, homogeneous, differential equations of motion to the solution of a set of nonhomogeneous algebraic equations. No theory of differential equations is used. Solution of the time-space path of the linear oscillator is demonstrated and compared to the exact solution.
    Keywords: PHYSICS (GENERAL)
    Type: Computer Methods in Applied Mechanics and Engineering; 7; Feb. 197
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  • 3
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    In:  Other Sources
    Publication Date: 2019-06-27
    Description: The theory of Ritz is applied to the equation that Hamilton called the 'Law of Varying Action.' Direct analytical solutions are obtained for the transient motion of beams, both conservative and nonconservative. The results achieved are compared to exact solutions obtained by the use of rigorously exact free-vibration modes in the differential equations of Lagrange and to an approximate solution obtained through the application of Gurtin's principles for linear elastodynamics. A brief discussion of Hamilton's law and Hamilton's principle is followed by examples of results for both free-free and cantilever beams with various loadings.
    Keywords: PHYSICS (GENERAL)
    Type: ASME PAPER 76-APM-R , American Society of Mechanical Engineers, 1976
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