The aim of the present paper is to find efficient method computation wave-making resistance a ship using mitchell’s integral. computational schemes described in publications suggest use simple quadratures (trapezoidal and Simpson’s rule) with fixed number integration’s intervals. This approach assumes manual setup algorithm for calculating each new makes it difficult estimate error obtained res...

A bstract We present analytic results of the two-loop master integrals for hadronic tW production that contain two massive propagators. For planar integral family, we succeed in constructing canonical basis, so are written terms multiple polylogarithms. The non-planar families have been calculated by Taylor series expansion around $$ {m}_W^2 <mml:math xmlns:mml="http://www.w3.org/1998/Math/Math...

This paper contains spectral and temporal information obtained from analyzing BL Lacertae object S5 0716+71. The broadband spectral energy distribution of this object is known to have two components, with the synchrotron emission peaking in the optical and the higher energy component taking over at X-ray energies, believed to be of inverse-Compton origin. Here we analyze XMM-Newton observations...

A hypersingular integral can be regularized by replacing the whole integrand by a forward difference quotient of 2nd order. If the density function is nearly singular, then Gauss quadrature formulas associated with a suitable modification of the Chebyshev weight function allow to obtain great precision with few nodes. However, in most cases, the own nature of this procedure makes unpredictable ...

An iterative definition of any n variable mean function is given in this article, which iteratively uses the two-variable form of the corresponding two-variable mean function. This extension method omits recursivity which is an important improvement compared with certain recursive formulas given before by Ando-Li-Mathias, PetzTemesi. Furthermore it is conjectured here that this iterative algori...

Aims. We describe a method for identifying XMM-Newton observations that have been affected by Solar Wind Charge Exchange (SWCX) emission and present preliminary results of previously unidentified cases of such emission within the XMM-Newton Science Archive. Methods. The method is based on detecting temporal variability in the diffuse X-ray background. We judge the variability of a low energy ba...

In this paper a simplified friction problem and iterative second-order algorithms for its solution are analyzed in infinite dimensional function spaces. Motivated from the dual formulation, a primal-dual active set strategy and a semismooth Newton method for a regularized problem as well as an augmented Lagrangian method for the original problem are presented and their close relation is analyze...

We show how the Newton-Hooke (NH) symmetries, representing a nonrelativistic version of de-Sitter symmetries, can be enlarged by a pair of translation vectors describing in Galilean limit the class of accelerations linear in time. We study the Cartan-Maurer one-forms corresponding to such enlarged NH symmetry group and by using cohomological methods we determine the general 2-parameter (in D = ...