Механические и нелинейные упругие характеристики поликристаллического алюминиевого сплава AMg6 и нанокомпозита n-AMg6/C-=SUB=-60-=/SUB=-

Metal cluster chemistry: Structure and stereochemistry in the polynuclear rhodium hydrides H_nRh_n[P(OR)₃]_2n

Crystallographic analyses of x-ray and neutron diffraction data have provided a definitive structural representation of fHRh[P(O-i-C3H7)3J2j2 and IHRhIP(OCH3)31213. These polynuclear hydrides are generated from square planar H2RhIP(OR)3J2 units by edge (hydrogen atom) sharing and by vertex (hydrogen atom) sharing to form the dimeric and trimeric structures, respectively. The square-planar units...

Synthesis and Characterization of Tb[N(CN)₂]₃·2H₂O and Eu[N(CN)₂]₃·2H₂O: Two New Luminescent Rare-Earth Dicyanamides

Two new rare-earth dicyanamides, namely, Tb[N(CN)2]3‚2H2O and Eu[N(CN)2]3‚2H2O, have been prepared by ion exchange in aqueous solution, followed by evaporation of the solvent at room temperature. The structures of both compounds have been solved and refined from single-crystal and powder X-ray diffraction data, respectively. The two compounds are isostructural and are built up from irregular qu...

Синтаксические и семантические модели и алгоритмы в задаче вопросно-ответного поиска (Syntactic and Semantic Models and Algorithms in Question Answering)

Three-Dimensional Finite Element Analysis of Tensile-Shear Spot-Welded Joints in Tensile and Compressive Loading Conditions

Выполнен трехмерный конечноэлементный анализ образцов с одним, тремя и пятью точеч­ ными сварными швами при растяж ении и сжатии. Д ля расчета на прочность исполь­ зуется распределение упругопластических напряжений в корне точечного шва. Предложена методика субмоделирования, позволяющая получить более точные результаты конечно­ элементного расчета точечных швов малых размеров. Схема численного ...

Magnetic properties of the Haldane-gap material [Ni(C₂H₈N₂)₂NO₂](BF₄)

Results of magnetization and high-field electron spin resonance (ESR) studies of the new spin-1 Haldane-chain material [Ni(C2H8N2)2NO2] (BF4) (NENB) are reported. A definite signature of the Haldane state in NENB was obtained. From the analysis of the frequency–field dependence of magnetic excitations in NENB, the spin-Hamiltonian parameters were calculated, yielding 1/kB = 17.4 K, g‖ = 2.14, D...