Interaction of a moving fibre having flexural rigidity with a friction body

Equations were obtained which can be used to account for the hysteresis effects of crumpling a fibre on a friction body, and consideration of the flexural rigidity allows explaining the nonlinear dependences of the fibre tension on the bending radius. A design was developed and a fast fibre tension tester which executes high-precision measurements of fibre tension with a minimal effect on the moving fibre is being installed in enterprises.Stekloplastik-Sertifikat Co., Zelenograd. Translated from Khimicheskie Volokna, No. 3, pp. 46–49, May–June, 1996.     

Theoretical principles and experimental investigations on the choice of technological ways to obtain variable-density materials

An analysis of the methods and technologies for obtaining multilayer articles is presented. The fundamental ways to produce high-quality layered materials reliable in operation are outlined. Compositions and an order of preparing the mixtures are recommended. The method of mathematical modeling is used to choose a regime of self-compaction of loose mixtures with allowance for the multifactor situation. The physicomechanical properties and the macro- and microporosities of double-layer corundum articles are investigated.Translated from Ogneupory, No. 7, pp. 11 – 20, July, 1995.     

Theoretical principles and experimental studies of heat and mass transfer in electric heating of chamotte-polystyrene mixtures in a closed perforated volume

Properties of special features of, and methods for preparing raw materials for unfired lightweight chamotte refractories are presented. The mechanism of self-absorption of a liquid glass solution in porous chamotte grains in a thermal force field is considered. The laws of filtration mass transfer in chamotte-polystyrene mixtures on a sodium silicate solution in a closed perforated volume are studied. Translated from Ogneupory i Tekhnicheskaya Keramika, No. 2, pp. 25–31, February, 1998.     

Scientific and technological principles for creation and use of fibre biocatalysts. A review

Translated from Khimicheskie Volokna, No. 5, pp. 28–36, September–October, 1994.     

Theoretical and experimental studies of chiral polyurethanes

The theoretical and experimental design strategies of chiral polyurethanes with good second harmonic generation efficiencies are discussed. The noncentrosymmetry of the polymers was broken by means of chiral and chemical poling. Different varieties of main chain chiral polymers are obtained by varying the composition of chiral and amido diol monomers using DBTDL catalyst. The designed chiral polymer architecture gives rise to high molecular weight polymers by the polyaddition polymerization with good thermal stability, linear and nonlinear optical activity. The polymer with isomannide as chiral moiety and CED (obtained by the aminolysis of ε-Caprolactone with 1, 2 diamino ethane) as amido diol monomer is found to possess high second harmonic generation efficiency. Both theoretical and experimental studies based on second order nonlinearity indicated that the designed chiral polyurethanes are useful for various nonlinear optical applications.     

A discussion of the paper “A theory for the flexural strength of steel fibre reinforced concrete”

The writers commend Dr. Swamy and Dr. Mangat for their interesting contribution. Dr. Swamy had also presented equation 9 earlier (1) to which the writers contributed a discussion. (2) In the present paper, however, the authors have attempted to give the methodology behind the derivation of their equation and adduce broad conclusions in general terms. Their study shows that further research is needed on the subject to deduce more precise conclusions. The writers would like to discuss several aspects of the paper and for a general coherence, the discussion is presented point.     

Theoretical and experimental studies of multiple nucleation

The theory of the potentiostatic current transient for three-dimensional multiple nucleation with diffusion controlled growth is discussed. Reliable values of nuclear number densities and nucleation rates are obtained from the analysis of the current maximum, and good agreement is obtained with experimental data for nucleation in several electrochemical systems. The termination of the nucleation process by the expansion of diffusion fields is considered, as well as the deviations from randomness observed in the distribution of nuclei on the electrode surface.     

Theoretical principles of use of coal fractions with different densities for combustion

It is reasonable to complement the conventional preparation of steam coal involving the removal of ash components and pyritic sulfur by the isolation of the lightest organic fractions, which possess enhanced performance characteristics. These fractions are smoothly saleable both on the domestic and world markets for effective pulverized-coal combustion via new combustion technologies. Heavier (inertinite) fractions of the coal preparation concentrate marketed at lower prices can be considered appropriate fuel for burning in circulating fluidized-bed combustion systems.     

Carbon-fibre adsorbents. Theoretical principles of production and conduct of sorption processes

The principles for selecting the initial polymer fibres for production of CFA are formulated, the conditions of activation of CF are determined, a mechanism of pore structure formation is proposed, and ways of regulating and varying the chemical state of the surface are demonstrated. The advantages of CFA over granulated carbons in the region of low concentrations and the presence of molecular-sieve properties in the fibre sorbents are demonstrated in a study of equilibrium sorption of vapors of organic substances and a series of fatty acids and dyes. The effect of diffusion factors in conducting sorption on CFA is determined.