The Rietveld refinement of the polycrystalline powders 1% Fe and Mn-doped (Na0.5Bi0.5)0.94Ba0.06Ti0.98V0.02O3 at Ti-site confirmed a single rhombohedral (R3c) phase. bandgap, (Eg) was affected by anti-phase octahedral tilt angle spin-orbit splitting energy Ti4+2p3/2 Ti4+2p1/2 states. decrease in Bi loss increase binding Ba due to Fe/Mn doping has been correlated strengthening Bi-O Ba-O bonds wh...

The temperature-dependent ac susceptibility of the filled skutterudite superconductor PrPt4Ge12 has been measured under hydrostatic He-gas pressure to 0.58 GPa. The superconducting transition temperature Tc decreases linearly with pressure P from 7.91 K at ambient pressure to 7.83 K at 0.58 GPa, giving the rate dTc/dP = 0.19 ± 0.03 K/GPa. Evidence is presented that suggests that the value of Tc...

Optimized Schwarz methods are a new class of Schwarz methods with greatly enhanced convergence properties. They converge uniformly faster than classical Schwarz methods and their convergence rates dare asymptotically much better than the convergence rates of classical Schwarz methods if the overlap is of the order of the mesh parameter, which is often the case in practical applications. They ac...

A family of dual-primal FETI methods for edge element approximations in two dimensions is proposed and analyzed. The primal constraints are here averages over subdomain edges. It is shown that the condition number of the corresponding method is independent of the number of substructures and grows only polylogarithmically with the number of unknowns associated with individual substructures. The ...

This paper deals with the estimation of the distance between the solution of a static linear mechanic problem and its approximation by the finite element method solved with a non-overlapping domain decomposition method (FETI or BDD). We propose a new strict upper bound of the error which separates the contribution of the iterative solver and the contribution of the discretization. Numerical ass...

Fedotovia Charitonov, 1946 is a genus of Gnaphosinae earlier known to contain only two species: F. uzbekistanica Charitonov 1946 (♂♀, type species) and F. mongolica Marusik, 1993 (♀). Revision of available material reveals two more species, both from Mongolia: F. mikhailovi sp. n. (♂♀) and F. feti sp. n. (♂♀). All four species have very similar copulatory organs and can be more easily different...