Birthrate of PN
نویسندگان
چکیده
منابع مشابه
The Birthrate of Magnetars
Magnetars, neutron stars with ultra strong magnetic fields (B ∼ 10−10G), manifest their exotic nature in the form of soft gamma-ray repeaters and anomalous X-ray pulsars. This study estimates the birthrate of magnetars to be ∼ 0.22 per century with a galactic population comprising of ∼17 objects. A population synthesis was carried out based on the five anomalous X-ray pulsars detected in the RO...
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The endgame of Lines of Action (LOA) is problematic because (1) LOA evaluation functions are not good predictors in the case of forced wins and (2) the state-space complexity of the LOA endgame is too large to use endgame databases. Because of the frequency of forced moves and the mobility component in the LOA endgame the utility of proof-number (PN) search is investigated in this paper. Also t...
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The concerns of relatively powerless groups may not be adequately addressed by health-care decisions based on market forces and on considerations of the general population. Calculations of the number of Navajo women at risk of unintended pregnancy suggest that several hundred such pregnancies would have occurred as a result of the withdrawal of intrauterine devices from the United States' marke...
متن کاملManifolds homotopy equivalent to Pn # Pn
We classify, up to homeomorphism, all closed manifolds having the homotopy type of a connected sum of two copies of real projective n-space. 1. Statement of results Let P = Pn(R) be real projective n-space. López de Medrano [LdM71] and C.T.C. Wall [Wal68, Wal99] classified, up to PL homeomorphism, all closed PL manifolds homotopy equivalent to P when n > 4. This was extended to the topological ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1983
ISSN: 0074-1809
DOI: 10.1017/s0074180900093979