Work hardening of alloys with short range order of atoms

The study presents analysis of the experimental flow curves for polycrystals of fcc concentrated solid solutions Ni-Cr and Ni-Mn. It was demonstrated that the flow curves of these alloys can be divided into a number of stages of work hardening, and stage II bisects into two substages: with parabolic, and linear hardening. It was demonstrated that the shape of the curves of work hardening is determined by the type of dependence L = f(σ), where L is the average path length of the motion of the dislocation;σ is flow stress. Some possible critical stresses of transition from stage to stage are discussed.     

Structural and Hydrodynamic Characteristics of Dextrans in Liquid-Phase Media

Viscous and volume properties of solutions of dextran with various molecular weights in water and dimethyl sulfoxide were studied.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 6, 2005, pp. 993–996.Original Russian Text Copyright © 2005 by Alekseeva, Rozhkova, Eliseeva, Prusov.     

Selective sorption of protactinium on aminopolystyrene azo derivative chelating resins

The sorption of protactinium on chelating resins, containing arsono groups, or other salt-forming groups on an aminopolystyrene lattice, is discussed. The chelating resins were synthesized by coupling diazotizedp-aminopolystyrene witho-hydroxyphenylarsonic acid, 2-arsonobenzene-(1-azo-2)-1,8-dihydroxynaphthalene-3,6-disulphonic acid (Arsenazo I) and some other monoazo derivatives of chromotropic acid. The dependence of sorption of Pa, Zr, Nb and Ta was investigated from hydrochloric acid and sulphuric acid solutions under static conditions as a function of the concentration of the acid. The feasibility of separating Pa from Fe, U, Zr, Nb, Th and Po is shown, using a solution 10N in respect to sulphuric acid and 0.3M in respect to oxalic acid and employing a resin obtained by coupling diazotized aminopolystyrene with Arsenazo I.     

Crystal and molecular structure of dicopper bis-(3-amino-5-methylisoxazole)tetraacetate [Cu2(μ-OCOCH3)2L2]

It was established by X-ray diffraction analysis that in the dimer complex of 3-amino-5-methylisoxazole (L) [ Cu₂(μ-OCOCH₃)₄L₂ ] the coordination bond is localized at the endocyclic pyridine type N atom. Arguments are given against other possible types of coordination in aminoisoxazole complexes conjectured from IR spectroscopy data in a number of publications. The dimer structure of the complex agrees with antiferromagnetic data (2J = -280 cm^-1 ). Translated fromZhurnal Strukturnoi Khimii, Vol. 41, No. 3, pp. 572-580, May–June, 2000.     

Short communications

The transport of carbonic acid anions through an anion-exchange membrane (AEM) during electrodialysis is studied. At current densities above limiting diffusion values, fluxes of hydrocarbonates and carbonates are lower than those of strong-electrolyte anions. The reason for the decreased fluxes is the recombination of carbonic acid ions with hydrogen ions that form during irreversible dissociation of water molecules at the solution/AEM interface