The possibility is shown of using millet threshing waste as filler for epoxy resin. Low-burning composite materials based on an epoxy resin matrix with millet hulls as filler have been developed.
The realization of theoretical and applied researches in the domain of ephemeris astronomy, connected with analysis of precision of existing planetary and lunar theories, the construction of an inertial coordinate system and investigation of physical properties of space-time, necessitated the elaboration in ΓΓΑ of the numerical theory of the motion of heavenly bodies suitable for calculation of high-precision ephemerides at large time-spans, and fit also for the maintenance of space experiments.In the course of construction of this theory, named AE89, the tasks to be solved are as follows: a) the construction of the dynamically consistent model of the orbital motion of the planets and the orbital-rotational motion of the Moon; b) the elaboration of an effective numerical integration method fit to the development of the ephemerides; c) the working out of a base of astrometric solar, lunar and planetary data; d) the determination of the dynamical parameters of the Solar system from the observations.
Mathematical modelThe adequate mathematical model of the motion of the Solar system bodies constitutes the framework of the numerical ephemeris. This model is accomplished in the form of a system of differential equations describing the orbital motion of 9 major planets, 5 of the most massive asteroids, and the orbital-rotational motion of the Moon, in the barycentric ecliptic reference system defined by the ecliptic and equinox of the epoch J2000.0.The orbital motions of the heavenly bodies considered as point masses, are presented by EinsteinInfeld-Hofmann equations. In the equations concerning the Earth and the Moon, the perturbations caused by their gravitational interaction as nonspherical rotating rigid bodies were added; the terrestrial zonal harmonics through 4-th degree and all the lunar harmonics through 4-th degree were also included. The rotation of the Moon about its centre of masses is described in terms of Rodrigues-
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