... In this Section we examine evolution of the number of binary X-ray sources in an arbitrary galaxy. ... However, the problem with its X-ray radiation spectrum remains unsolved because no objects of this type have been observed so far. ... The total X-ray luminosity from different types of objects is traced separately at any instant. First, we calculated the evolution of the X-ray luminosity   assuming a delta-function (instantaneous) shape for the star formation rate. ...

... Authors: Tahina Ramiaramanantsoa et al. arxiv:1403.7288 iPTF 13bvn: Первые указания на двойного прародителя сверхновой типа Ib (iPTF 13bvn: The First Evidence of a Binary Progenitor for a Type Ib Supernova) . Authors: Melina C. Bersten et al. arxiv:1403.6056 Быстрая эволюция восхитительной звезды в туманности Скат (The rapid evolution of the exciting star of the Stingray Nebula) . ... обзор arxiv:1403.0007 История звездообразования во вселенной (Cosmic Star Formation History) . ...

... The following sections contain the formal SGML definition of HTML 4.0. It includes the SGML declaration , the Document Type Definition (DTD), and the Character entity references , as well as a sample SGML catalog . ... Default DTD: . http://www.w3.org/TR/REC-html40/strict.dtd . ... http://www.w3.org/TR/REC-html40/loose.dtd . ... For better validation, you should check your document against an SGML parser such as nsgmls (see [SP] ), to verify that HTML documents conform to the HTML 4.0 DTD. ...