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An estimate of the maximal computing power available to advanced extraterrestrial or future (post)human civilizations is presented. It is shown that the fundamental thermodynamical considerations ma...
Two spherically symmetric mass-distribution models - a special case of the generalised Schuster density law and the generalised isochrone model (both yield the same approximate density dependence on...
The life and scientific and professional activities of Danilo Zulevi´c (1937 − 1998), research fellow of the Belgrade Astronomical Observatory, are presented, followed by the Bibliograph...
Using a semiclassical approach, we have calculated electron−, proton−, and He II−impact line widths and shifts for 52 Be III multiplets as a function of temperature and perturber d...
Using a criterion proposed by Salpeter and standard solid-state physics, we have determined the Debye temperature of a solid in equilibrium with the electron gas surrounding it. The results obtained...
We find that any really close concentration of positions of poles of orbital planes for binaries is not affected by the corresponding positions of ”mirror poles” for the same orbital planes. Namely,...
ORBITS OF 6 BINARIES     binaries  visual       2009/3/6
In this paper the orbits of binaries WDS 10093+2020 = A 2145, WDS 21074􀀀0814 = BU 368 AB and WDS 22288􀀀0001 = STF 2909 AB are re- calculated because of significant deviations of mo...
New orbital elements for four binaries: WDS 00416+2438 = WRH 28, WDS 01554+0257 = A 2407 = ADS 1530, WDS 15031+4439 = CHR 43 and WDS 22550+5132 = HU 785 = ADS 16368 and one triple star WDS 23393+454...
The space debris population is similar to the asteroid belt, since it is subject to a process of high-velocity mutual collisions that a ects the long- term evolution of its size distribution. Presen...
More than a decade elapsed after the HIPPARCOS ESA missi- on (ESA 1997) observations have been collected. This rst astronomical satellite mission was less than 4 years long so that 1991.25 is the e...
虚拟天文台:科学、工具及应用。
利用分形理论分析了德兴地区断裂构造的特点。结果表明,不仅研究区内的断裂带有自相似性,子区域也有相似现象。矿产区的分维值略高于整个研究区,铜矿区分维值高于金矿区,NW、NWW走向断裂带的分维值远高于SE走向的。说明分维值越大,越有利于矿床的形成;分维值越大的断裂走向,对矿床的产出位置控制作用越明显;地质构造复杂程度越高,分维值也越大,线性展布也越复杂。
近期Solanki等利用树木年轮中14C含量变化的测算资料, 重建了过去10000多年间采样间隔为10 a的太阳黑子数序列, Usoskin等则利用地磁变化资料重建了过去近7000年间采样间隔也为10 a的太阳黑子数序列. 本文采用Lomb-Scargle谱分析方法研究了这两个序列, 得到了太阳活动的百年至千年时间尺度的周期和准周期, 它们大约为225, 352, 441, 522和561 a以及...
探月飞行中太阳帆航天器帆面光学性能演化。

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