An Approach to Structural and Functional Modeling of the Surface Morphology of Materials Based on Fluorinated Polymers

Russian Journal of General Chemistry - Dynamic modeling of the polymodal morphological structure of the polymer surface, with modified polyethylene terephthalate as an example, was performed. In...     

Desulfurization of tall oil pitch

Method for desulfurization of tall oil pitch is suggested. The method is based on successive treatments with hydrogen peroxide, sulfuric acid, and aqueous solutions of acetonitrile. As a result, the total content of sulfur was reduced from 3800 to 220 ppm. The fuel characteristics of the desulfurized pitch were determined. The purified pitch can be used in the conventional areas of its application, in which restrictions are imposed on the total content of sulfur.     

First observation of the doubly charmed baryon Xi(+)(cc)

We observe a signal for the doubly charmed baryon Xi(+)(cc) in the charged decay mode Xi(+)(cc)-->Lambda(+)(c)K-pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. We observe an excess of 15.9 events over an expected background of 6.1+/-0.5 events, a statistical significance of 6.3sigma. The observed mass of this state is 3519+/-1 MeV/c(2). The Gaussian mass width of this state is 3 MeV/c(2), consistent with resolution; its lifetime is less than 33 fs at 90% confidence.     

Friction and wear with lubrication by the products of the thermo-oxidative destruction of polyethylene

Results are given of a study of the friction and wear processes when the products of the rmooxidative destruction of polyethylene are used as a solid lubricant and modifying agent. It is established that their physicochemical properties provide a very low coefficient of friction and wear in metal-electronegative-polymer pairs.     

Mechanism of chlorine evolution-ionization on dimensionally stable anodes

New experimental data concerning the influence of pH on the chlorine reaction kinetics at dimensionally stable anodes are used to correct the earlier developed concepts on the mechanism of this reaction and the nature of active centers.     

Measurement of Parameters of Neutral Mesons Produced in Meson–Nucleus Interactions in Hyperon-M Experiment

Physics of Atomic Nuclei - According to modern theories, the parameters of neutral mesons such as their mass and width are closely connected with the medium in which the mesons are present....     

Study of discrete automaton models of gene networks of nonregular structure using symbolic calculations

We introduce the discrete automaton models of gene networks with weight functions of vertices accounting for the various forms of the regulatory interaction of agents. We study the discrete mapping that describes the operation of a fragment of the gene network of the bacteria E. coli. For this mapping, we find its fixed points (stationary states) on using the SAT approach. We also study the mappings that are defined by the random graphs of the network which we generate in accordance with the Gilbert-Erdos-Renyi and Watts-Strogatz models. For these mappings, we find the fixed points and the length 2 and 3 cycles. This article can be regarded as a survey of our results on the discrete models of gene networks and the numerical methods for studying their operation.     

Corrosion behavior of dimensionally stable anodes in chlorine electrolyses

The rate of anodic dissolution of ruthenium from the active coating of dimensionally stable anodes is studied as a function of time by a radiotrace technique in chloride and perchlorate solutions. In chloride solutions, the rate decreases by approximately four orders of magnitude and for a long (hundreds of hours) time. In the perchlorate solution, the dissolution rate changes only by hundredfold, for 25 min. These data confirmed the earlier conclusion that adsorbed chlorine inhibits anodic dissolution of the noble metal. The pH influence on the anode’s steady-state corrosion rate is studied. The corrosion rate sharply increases of pH increasing from 2 to 4 then slowly decreases to the values characteristic of the process rates in solutions of pH 2.     

ICP-AES analysis of aluminum isopropoxide,yttrium, and neodymium oxide nanopowders

A technique has been developed for analysis of impurities in precursors of the optic ceramics: aluminum isopropoxide, yttrium and neodium oxide nanopowders (weight fraction of Nd ≤5%) by atomic-emission spectroscopy with inductively coupled plasma. In the case of aluminum isopropoxide, the effect of matrix is compensated by applying Bi as an internal standard. The detection limits of impurities were found to be 10^?5–10^–6 wt.%.