... Многогранники называются остроугольными, если все их двугранные углы являются острыми или прямыми. Одним из существенных стимулов для их изучения является то, что частным случаем остроугольных многогранников являются многогранники Кокстера, возникающие в теории групп отражений. Как описать все остроугольные многогранники? Если наложить на двугранные углы более сильное условие - быть острыми, то все такие многогранники (в трехмерном евклидовом пространстве) являются тетраэдрами. ...

... S.P. KOROLEV ROCKET AND SPACE CORPORATION ENERGIA . ... OAO RSC "Energia" . ... Company's History . ... History . Brief History of Rocket and Space Technology . ... ISS Russian Segment . ... Consolidated study of the ISS dynamic characteristics; parameters defining a space position of scientific devices and attitude sensors with respect to the station hull deformation; parameters of magnetic and microgravity disturbances on board the station. ... 2015 JSC "S.P. Korolev RSC "Energia" . ...

... Using the CFBDSIR wide field survey for brown dwarfs, we identified CFBDSIRJ214947.2-040308.9, a late T dwarf with atypically red J-Ks colour. ... SN 2009ip in NGC 7259 Electronic Telegram No. ... 7.09, [19.0; 2009 Aug. ... Accepted for publication in MNRAS Subjects: High Energy Astrophysical Phenomena (astro-ph.HE) The jet opening angle theta_jet and the bulk Lorentz factor Gamma_0 are crucial parameters for the computation of the energetics of Gamma Ray Bursts (GRBs). ...

Full-Text Search . ... astro-ph . ... SAI VO . Search sort results by Date Relevance . ... Whitespace-separated words are treated as AND ed. Show 10 50 100 articles per page in Full Compact mode . Normalized to: Angle, J. 9 article(s) in total . 46 co-authors, from 1 to 9 common article(s). ... Aprile, E.. Arneodo, F.. ... Dahl, C. E.. ... SAI MSU . ...

polimodel -- Produce model linear polarization and position angle images . ... Whether to apply random errors to output polarization and position angle values. seed = "" [integer] . ... This task produces a model linear polarization image and corresponding position angle image from an input image assumed to represent intensity (Stokes I parameter). ... A threshold for the input image can be defined such that polarization and position angle are not computed for input values less than this threshold. ...

... GCR and SCR are primary cosmic rays. 10-15 years after the discovery of cosmic radiation (1919) there emerged two main avenues of investigation in the physics of cosmic rays (CR): 1) nuclear - elucidation of the origin of elementary particles and nuclear interactions; and 2) astrophysical (space physics) - solution of the problem related to the origin and variations (changes in intensity) of CR. ... Besides, the CR flux in interplanetary space is, strictly speaking, not isotropic. ...

... Submitted by Al Takeda on 07/13/2012 10:35:53 . Sunspot 1515 in Hydrogen Alpha . This naked eye sunspot region was taken with John Blomquist’s double-stacked hydrogen alpha filter system on a customized Televue 102i refractor and my color Philips ToUcam webcam and G-11 mount. ... The brighter areas in the center region show Field Transition Arches which are areas of opposite magnetic polarity. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... DIAGNOSTICS OF IONOSPHERIC IRREGULARITY SPECTRUM USING MEASUREMENTS OF RADIO WAVE ANOMALOUS ATTENUATION UNDER VERTICAL SOUNDING . ... The selected experimental data are characterized by a high average level of attenuation of a signal of vertical sounding (10 dB and above), which cannot be caused by collisional absorption of radio waves (practically absent in a dark time of day) and, hence, being a consequence of scattering on random irregularities. ... ATTENUATION OF A VERTICAL SOUNDING SIGNAL . ...

... part 2 | ... Part 1 . The new concept of formation and development of the Solar system. ... Thus, the initial pulse of the rotation of a protosolar cloud of the solar system was determined as a result of the diversion of a part of the moment of the rotational pulse of the Galaxy. ... Besides this new approach to the pre-solar system as a system of the destroyed vortex structure, we can understand now a number of other peculiarities of the Solar system's structure. ...

include graphics.h #include math.h #include conio.h const double l=10000000; const float V0=5000; const float angle =0.5; const float dt=500; const double G=6.67e-11; const double M=5.98e24; double E; float p; float F; float b; float b_angle ; float S; float x1; float y1; float r; float Vi; int xC; long ...

The potential of plasma By Lisa Tidwell Astronaut Franklin Chang-Diaz, Director of the Advanced Space Propulsion Laboratory, works on the VASIMR engine. jsc2003e49523 Photo by James Blair Scott Winter, from Safety, Reliability & Quality Assurance, makes adjustments on the VASIMR. jsc2003e49525 Photo by James Blair A T A GLANCE HOW THE V ASIMR ENGINE WORKS The VASIMR engine works through a set of three linked magnetic cells. ... This plasma is what drives the rocket engine. ...

... Head of the seminar: Prof. B.V. Somov, . ... The seminar considers the questions related to generation of magnetic fields in astrophysical plasmas, effect of the magnetic reconnection and particle acceleration in strong magnetic fields, the origin and propagation of cosmic rays, the flares and other non-stationary phenomena in the solar atmosphere and solar wind, Sun Earth connections and physical processes in the heliosphere. ... On the Topological Models and Topological Trigger of the Solar Flares...

... Ciel Espace, le magazine qui vous guide toujours plus loin . ... Ciel Espace, nouvelle formule, c'est . ... des pages consacr†йes †а la publication de vos photos Mais c'est aussi une vraie communaut†й avec laquelle partager votre passion et nourrir votre curiosit†й. Accueil De la temp†кte solaire aux aurores bor†йales . ... Pour en savoir plus sur les aurores bor†йales, consultez notre article €л †А la poursuite des aurores bor†йales €Ё paru dans le Ciel & Espace de septembre 2011. ... Etat du ciel ...

NAUTICAL ASTRONOMICAL ALMANAC for 2002-2003 (in Russian) . ... Hour angles, declinations and sidereal hour angles . ... Determination of latitude by Polaris (Pole star) . ... The star globe . ... Maps of the star sky . ... The index to stars . ... Use NAA-2 in 2004 . ... Daily tables on 2002-2003 . ... Tables for correction of the observed altitudes . ... Determination of the position of a ship by using bearings of the Sun . ... Determination of the position of a ship by using bearings of stars . ...

... The OC "Mir" orbit parametres before the final burns . ... Orbit period (in min) . ... Mean orbit altitude (km) . ... solar F 10.7 flux . ... F 10.7 <= 100 - low level; 100 < F 10.7 < 150 - medium level; F 10.7 >= 150 - high level . Orbit 86328(15) - the first burn bulding the descent orbit  D V 1 =9.3 m/s. After burn altitude H min = 188.2 km, H max = 219.2 km. Orbit 86329(16) - the descent orbit second impulse D V 2 =10.4 m/s. After burn altitude H min = 158.9 km, H max = 218.5 km. ...