Astronomy Reports -- October 2004 Volume 48, Issue 10, pp. 787-875 Galactic Systems Against the Background of the Cosmic Vacuum: Structure and Evolution of the Zero-Acceleration Surface V. P. Dolgachev, L. M. Domozhilova, and A. D. Chernin pp. 787-794 Full Text: PDF (555 kB) Estimate of the Evolution of the Galactic Gas Component for the z Interval from 0 to 3.6 A. F. Dravskikh pp. 795-799 Full Text: PDF (166 kB) Models of Astrophysical Decretion–Accretion Diffusional Disks A. V. Tutukov and Ya. N. Pavlyuchenkov pp. 800-812 Full Text: PDF (248 kB) Dissipation of the Hot Dust Envelope of CH Cygni (1996–2003) O. G. Taranova and V. I. Shenavrin pp. 813-825 Full Text: PDF (497 kB) Two-Stage Algorithm for Reconstructing the Images of the Gravitational Lens QSO 2237+0305 E. A. Koptelova, E. V. Shimanovskaya, B. P. Artamonov, M. V. Sazhin, and A. G. Yagola pp. 826-833 Full Text: PDF (240 kB) A Statistical Analysis of Methanol Maser Groups I. E. Val'tts and S. Yu. Lyubchenko pp. 834-839 Full Text: PDF (153 kB) The Rapid Variability of Blazars at Optical Wavelengths V. S. Bychkova, N. S. Kardashev, V. V. Vlasyuk, and O. I. Spiridonova pp. 840-852 Full Text: PDF (208 kB) A Comparative Analysis of Zebra-Pattern Structures at Frequencies from 20 to 7000 MHz G. P. Chernov pp. 853-870 Full Text: PDF (794 kB) The Helioseismological CORONAS-F DIFOS Experiment N. I. Lebedev, V. D. Kuznetsov, V. N. Oraevskii, J. Staude, and R. I. Kostyk pp. 871-875 Full Text: PDF (134 kB)