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A B-type main-sequence star (B V) is a main-sequence (hydrogen-burning) star of spectral type B and luminosity class V. These stars have from 2 to 16 times the mass of the Sun and surface temperatures between 10,000 and 30,000 K. [1]
Bintang Timur apparently resumed publication in early 1953 after being unable to publish during World War II and the Indonesian National Revolution. [6] Under its new guise in independent Indonesia , Parada Harahap once again became president-director and head editor, and promised that the paper would have a "national progressive" line and to ...
A three-dimensional model of a figure-eight knot.The figure-eight knot is a prime knot and has an Alexander–Briggs notation of 4 1.. Topology (from the Greek words τόπος, 'place, location', and λόγος, 'study') is the branch of mathematics concerned with the properties of a geometric object that are preserved under continuous deformations, such as stretching, twisting, crumpling ...
A multiple star system consists of two or more stars that appear from Earth to be close to one another in the sky. [dubious – discuss] This may result from the stars actually being physically close and gravitationally bound to each other, in which case it is a physical multiple star, or this closeness may be merely apparent, in which case it is an optical multiple star [a] Physical multiple ...
On 10 August 2006, after months of unsuccessful negotiations with Elsevier about the price policy of library subscriptions, the entire editorial board of the journal handed in their resignation, effective 31 December 2006.
Star topology in use in a network. A star network is an implementation of a spoke–hub distribution paradigm in computer networks.In a star network, every host is connected to a central hub.
If is a topological space then the following conditions are equivalent: . is a T 1 space.; is a T 0 space and an R 0 space.; Points are closed in ; that is, for every point , the singleton set {} is a closed subset of .
Electrical potential surface of paracetamol showing polar areas in red and blue. The polar surface area (PSA) or topological polar surface area (TPSA) of a molecule is defined as the surface sum over all polar atoms or molecules, primarily oxygen and nitrogen, also including their attached hydrogen atoms.