منابع مشابه
formation and evolution of regional organizations: the case study of the economic cooperation organization (eco)
abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...
15 صفحه اولThe Soliton Stars Evolution
The evolution of a soliton star filled with fermions is studied in the framework of general relativity. Such a system can be described by the surface tension σ, the bag constant B, and the fermion number density ρ0. Usually one of these parameters prevails in the system and thus affects the spacetime inside the soliton. Whether it is described by Friedman or de Sitter metric depends on the prev...
متن کاملThe Evolution of Ap Stars
The many peculiarities of Ap stars (not only chemical ones , but also magnetic field and slow rotation) may vary during the main-sequence evolution of these stars. We review here briefly the evidences found in the last thirty years for such evolution , with an emphasis on the more recent research. The position in the HR diagram of low mass Ap stars with a significant surface magnetic field (as ...
متن کاملAccretion disc evolution in single and binary T Tauri stars
We present theoretical models for the evolution of T Tauri stars surrounded by cir-cumstellar discs. The models include the effects of pre-main-sequence stellar and time dependent disc evolution, and incorporate the effects of stellar magnetic fields acting on the inner disc. For single stars, consistency with observations in Taurus-Auriga demands that disc dispersal occurs rapidly, on much les...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics Supplement
سال: 1981
ISSN: 0375-9687
DOI: 10.1143/ptps.70.77