Effect of Alloying Elements on the Temperature Dependence of the Rate Constants and on the Activation Energy of Oxidation of Titanium Alloys

The influence exerted by the nature, concentration of alloying elements on the temperaturedependence of the rate constants and on the activation energy of oxidation of titanium alloys in air at 823-1473 K was considered.     

On Application of the Partition Distance Concept to a Comparative Analysis of Psychological or Sociological Tests

Abstract

We discuss two distance concepts between q-ary n-sequences, 2 ≤ q < n, called partition distances. This distances are metrics in the space of all partitions of a finite n-set. For the metrics, we study codes called q-partition codes and present a construction of these codes based on the first order Reed–Muller codes. A random coding bound is obtained. We also work out an application of q-partition codes to the statistical analysis of psychological or medical tests using questionnaires.     

Temperature Dependence of Oxidation Rate Constants for Titanium-Iron Alloys

The influence of titanium alloying with iron on the temperature dependence of the rate constantsand activation energy of oxidation in air at 973-1473 K was studied.     

Unsaturated hydantoin derivatives. 18. Alkaline hydrolysis of 2-thioxo-5-arylidenehydantoins and some of their derivatives

The alkaline hydrolysis of 2-thioxo-5-arylidenehydantoins (R = p-NO₂, p-Br, H, p-Me, and p-OMe) and their mono- and dialkyl derivatives proceeds with the formation of arylpyruvic acids, which undergo subsequent decomposition in the presence of oxygen in alkali solutions. 2-Thioxohydantoin, thioparabanic acid, and thiourea were not detected among the reaction products. Side processes involving the oxidation of the thioxohydantoins also take place under these conditions. The rate of hydrolysis of 2-thioxo-5- arylidenehydantoins varies as the concentration of alkali in solution changes, and the log k = f (C_KOH) dependence is S-shaped. The hydrolysis of nonionized hydantoins and their monoanions is a bimolecular reaction and is first-order in substrate and hydroxide ion. The rate-determining step in the hydrolysis is the addition of hydroxide ion to the carbon atom of the C₄=O group.See [1] for communication 17.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 406–412, March, 1979.     

Attraction of positively charged particles in highly collisional plasmas

It is shown that the electrostatic interaction potential between a pair of positively charged particles embedded in a highly collisional plasma has a long-range attractive asymptote. The effect is due to continuous plasma absorption on the particles. The relevance of this result to experimental investigations of complex (dusty) plasmas is discussed.