Memoir Hubert Anson Newton . 1830 - 1896
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Revision of the New World genus Peckia Roniveau-Desvoidy (Diptera: Sarcophagidae).
The New World and largely Neotropical genus Peckia Robineau-Desvoidy, 1830 is revised with a key to all species. Peckia is considered a senior synonym of Guanoxipha Lehrer, 2012, n. syn. and of Sarcodexia Townsend, 1892, n. syn., the first one under Squamatodes Curran and the latter maintained as a valid subgenus, which here is redefined giving the new generic combinations Peckia (Sarcodexia) l...
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We present X-ray spectral analysis of five Chandra and XMM-Newton observations of the gravitationally-lensed blazar PKS 1830−211 from 2000 to 2004. We show that the X-ray absorption toward PKS 1830−211 is variable, and the variable absorption is most likely to be intrinsic with amplitudes of ∼ 2× 10– 30 × 10cm depending on whether or not the absorber is partially covering the X-ray source. Our ...
متن کاملCorrelation between hepatitis B genotypes, 1896 precore mutation, virus loads and liver dysfunction in an Indian population.
BACKGROUND/OBJECTIVES Hepatitis B virus (HBV) genotypes may differ in pathogenicity. However, the interplay between different virus characteristics such as genotypes, mutants and virus loads has not been well studied . We investigated the association between HBV genotype, presence of 1896 precore mutation and HBV viral loads in patients with HBV-related liver disease. METHODS One hundred and ...
متن کاملar X iv : 0 80 3 . 19 00 v 1 [ as tr o - ph ] 1 3 M ar 2 00 8 High energy properties of PKS 1830 - 211
We report on an analysis of Xand γ-ray observations of PKS 1830 − 211, based on the long-term campaigns carried out by INTEGRAL and COMPTEL. The INTEGRAL data currently available present a 33σ significance detection in the 20 − 100 keV band, while the COMPTEL 6-years data provide a 5.2σ significance detection in the 1−3 MeV energy band. At hard X-rays, INTEGRAL and supplementary SWIFT observati...
متن کاملNewton-Type Methods for Nonlinear Least Squares Using Restricted Second Order Information
In the paper, a special approximated Newton method for minimizing a sum of squares f(x) = 1 2 ‖F (x)‖ = 1 2 Pm i=1[Fi(x)] 2 is introduced. In this Restricted Newton method, the Hessian H = G + S of f where G = (F ′)T F ′, S = F ◦ F ′′, is approximated by ARN = G + B where B = Z2Z T 2 SZ2Z T 2 is the restriction of the second order term S on the subspace imZ2 spanned by the eigenvectors of the G...
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