Study of plastic shear deformation in surface layer at friction. Simulation results. Part II. Effect of friction parameters

Deformation and temperature in the surface layer of plastic material and thickness of the plasticized layer are calculated using the one-dimensional macroscopic friction model developed in the first part of the paper [1]. We have studied the effect of sliding velocity, contact spot area, hardening ability, and thermal conductivity of material on the frictional heating and plastic deformation of the surface layer during a single touch between the contact spot and counterbody. Repeated contacts of the specimen and counterbody are simulated and the accumulation of plastic shear is considered for different contact spot sizes.     

Kinetics of heat release during decomposition of cellulose

The kinetic behavior and temperature dependences of the rate constants for thermal decomposition are determined for cellulose of different biological origins and forms. The possibility of thermal decomposition of cellulose in a combustion regime without oxygen is analyzed. Chernogolovka Institute of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka. Translated from Fizika Goreniya i Vzryva, Vol. 29, No. 6, pp. 49–53, November–December, 1993.     

Preferential retention of the mink chromosome group in somatic cell hybrids of Chinese hamster and American mink

The chromosomal complement was studied in 57 independent clones of hybrid cells obtained in six experiments for fusion of Chinese hamster and American mink cells. Various mink chromosomes in hybrids of concern are lost. It is shown when a small number of mink chromosomes are retained in hybrid clones, chromosomes 6, 9, 10, 12, 13, 14 and X segregate in a similar way and are preferentially retained in these clones. When a considerable number of mink chromosomes are detained in hybrid clones, the segregation mode is close to a random one.     

Optimal Pricing of Climate Risk

Computational Economics - The climate change model of Daniel et al. (Proc Natl Acad Sci USA 116(42):20886-20891, 2019. https://doi.org/10.1073/pnas.1817444116) is an important contribution to the...     

Exchange reactions control for selective separation of glyoxylic acid in technological mixtures of glyoxal oxidation

Separation of glyoxylic acid from unpurified multicomponent technological mixtures, resulting in the process of direct oxidation of glyoxal, and preparation of sodium glyoxylate are developed. The mixtures are treated with an optimal amount of CaCO_3, which has to be prespecified by acidic–basic titration of the technological mixtures. Both separation of glyoxylic acid and preparation of sodium glyoxylate take place owing to ionic exchange reactions: calcium glyoxylate is easily converted into glyoxylic acid by action of oxalic acid. Reaction with Na₂CO₃ leads to the formation of sodium glyoxylate.