[en] Effects of accuracy decrease and of dynamical range restriction of signal amplitudes in analog-to-pulse converters developed using logarithmation-potentiation on semiconducting diodes or bipolar transistors and ways for decreasing of these effects are considered. The block diagram of the device and formulas for calculation of its accuracy as well as its possible limiting values are presented. The obtained measuring results prove the calculation possibility of obtaining the dynamical raige of the device (input-output) 75a:1 at the accuracy not worse than +-0.1% and at <= 3 μs processing time

No abstract available

[en] Specific features of actinide atoms (A=Th, Pa, U, Np, Pu) surrounding in the structure of crystals of fluorine-containing compounds were studied using the Voronoi-Dirichlet polyhedrons. It has been revealed that the volume of the Voronoi-Dirichlet polyhedrons for actinide atoms in fluorine atoms surrounding is determined by their valency state, being actually independent of coordination number. Using coordination polyhedrons AO_n and AF_n by way of example, it has been shown that in the crystal structure geometrical characteristics of the Voronoi-Dirichlet polyhedrons of actinide atoms and surrounding nonmetal atoms are interrelated. Specifically, growth of electronegativity of the atoms when passing from oxygen to fluorine gives rise to reduction of A atoms size, irrespective of their oxidation state, by 0.05 A on the average

No abstract available

[en] As it has recently been shown the domain of influence of an atom surrounded in the first coordination sphere by the atoms of one sort is described, correct to similarity, by its Voronoi-Dirichlet polyhedron (VDP). The calculation of VDPs requires only standard crystallographic data and does not require the knowledge of the electron density function; therefore, the method reported can be employed to analyze atom domains of influence in structures of arbitrary complexity. This work is devoted to studying the sizes of the domains of influence of uranium atoms in various oxidation states that are surrounded by oxygen atoms

[en] Domains of certain anions, including Te^2-, I^-, etc., have been studied for the first time using the Voronoj-Dirichlet polyhedrons. An attempt to evaluate their absolute dimensions in crystal structures has been made

[en] A study was made on geometrical characteristics of Voronoj-Dirichlet polyhedrons of uranium atoms (3, 4, 5 or 6) in crystals, containing coordination polyhedrons of UX_n composition at X = F, Cl, Br or I. It was established, that the volume of Voronoj-Dirichlet polyhedrons of uranium atoms (at fixed oxidation degree of metal and type of x atoms) didn't depend on coordination number of uranium atom. Quantitative criterion of the presence of the nearest order, conditioned by interatomic interaction in random multilattice, consisting of several chemical types of atoms was suggested. 12 refs.; 2 figs.; 6 tabs

[en] Geometric characteristics of the Voronoi-Dirichlet polyhedrons (VDP) of 354 U(6), atoms in the structure of oxygen-containing compounds have been ascertained. It has been revealed that VDP volumes in contrast to the volumes of the relevant coordination polyhedrons practically do not depend on coordination numbers of uranium atoms and amount to 9.18(25) A³ on the average. The results obtained agree with the previously suggested model of deformed spheres describing the packing of structural units in uranium(6) compounds. 12 refs.; 3 figs.; 4 tabs

[en] Analysis of crystallostructural role of 93 types of U(3 -U(6) atoms, incorporated into coordinated UO_nCl_m polyhedron composition is conducted using Voronoi-Dirichlet polyhedra (VDP). It is ascertained, that without using any crystallochemical radii, the VDP allow one to ascertain the value of coordinated numbers of uranium atoms and composition of their coordination area. Taking UO_nCl_m complexes as are example it is shown, that a series of VDP characteristics can be successfully used as quantitative parameters, allowing one to describe and analyse the specific nature of local environment of complexing atoms in the structure of inorganic and coordination compounds

[en] A study was made on combinatorial-topological structure of sublattices of complexing atoms (taken as centers of corresponding complex groups) in structures of Ti, Zr, Hf, Mo, Th, U and Np coordination compounds. 8 refs., 2 figs., 2 tabs