The substructure evolution was observed in the range of scales from dozens nanometers
to millimeters on the surface of the aluminum single crystalline plates under restricted cyclic
tension. The self-similar systems of crossing bands that create the grid-like ordered structures on
different scales are assumed to be clear manifestation of their self-organization. The selforganization
of these grid-like structures is assumed to be inevitably related to the crystal structure
defects (dislocations, point-like defects and their ensembles). The model is proposed for explanation
of 2-dimensional rectangular "tweed" and 3-dimensional rhombic "pullover" pattern formations
which are related to cooperative arrangement of crystal structure defects.
Abstract. The present status of the Kyiv meridian axial circle after its refurbishment is described. The mounting of a new micrometer with the front-illuminated CCD 1040×1160 allows to observe stars up to V = 16 mag. For the stars of 11-14 mag, the internal positional accuracy of a single observation is 0.05-0.10 , and stellar V values are determined with an accuracy of 0.03-0.06 mag. The project of observations of star fields in the direction of 209 extragalactic radio-sources in declination zone 0+30 • is now in progress. The catalogue of positions, magnitudes and proper motions of secondary reference stars in regions with ICRF sources is expected to be compiled by 2003. Another project under way is a long-term astrometric survey of the equatorial zone to extend the Hipparcos-Tycho frame to fainter stars, and to measure their magnitudes and V − R colours.
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