Mathematical model of the process of catalytic reforming of the wide gasoline fraction

Conclusions It has been shown that the generally accepted catalytic reforming model suggested in [1] is a formal one,although it uses the chemical kinetics equations. To improve the approximation of the model to the true mechanism of the process, it has been suggested that all paraffinic hydrocarbons up to and including C₆ be included in the group of light unreactive hydrocarbons.The coefficients of the model have been found on the basis of the experimental data obtained on a semiindustrial unit. It has been shown that the calculated concentrations of the groups of hydrocarbons agree satisfactorily with the experimental values in the wide range of temperatures, volume rates, and compositions of the crude.Translated from Khimiya i Tekhnologiya Tekhnologiya Topliv i Mesel, No. 11, pp. 6–10, November, 1972.     

The conditioning of the N100-P200 component of the human visual evoked potential by using biofeedback

Subjects were instructed to modify their N100-P200 component of VEP (in Cz recording) within selected time window. The aim was to increase the number of VEPs for which the amplitude of segment in question exceeded the definite threshold. The success in task performance suggests several modifications of the to-be-conditioned segment through different mechanisms. Of our 26 subjects, 14 were able to modify their VEPs according to the task demands. However, the latter subjects could be divided into 2 groups on the basis of the rate of increase in the number of correct responses under conditioning. Subjects which did not succeed in task performance could be also classed into 2 groups: one group with statistically negligible changes and the other decreasing the number of correct responses. ANOVA has shown significant distinctions in task performance for the groups with different levels of self-estimation of tiredness after experiment and different personal strategies. The success in task performance is likely to be dependent on the values of Eysenck questionnaire scales and topography of alpha activity.     

Laser ignition of nickel-aluminum powder systems

A method for determining the thermokinetic constants of the SHS reaction and thermophysical properties of the initial mixture and reaction products involving the use of laser initiation of the reactive mixture has been developed. A technique for experimentally studying the ignition process of the reacting mixture is describedScientific Research Institute of Building Materials, 634003, Tomsk. Translated from Fizika Goreniya Vzryva, Vol. 30, No. 2, pp. 14–18, March–April, 1994.     

Improved running-in of a frictional pair consisting of a cylinder lining and a piston ring

Improvement in the running-in of internal combustion engines by applying copper and antifrictional coatings to the cylinder surface is considered. The recommended optimal conditions correspond to higher surface quality and shorter running-in.     

Use of solutions of radiation-synthesized telomers of tetrafluoroethylene to modify glass fiber

In this work, we have suggested a new approach to fabricating fluorine-containing glass fibers based on the infiltration of glass-fiber filler by radiation-synthesized telomer solutions of tetrafluoroethylene. The radiation-chemical synthesis of tetrafluoroethylene telomers has been carried out in some solvents, their thermal stability has been studied, and the effectiveness of various telomers has been evaluated.     

Hybrid Carburetion in Compact Diesel Engines

Carburetion in a diesel engine with compressive ignition of the working mixture is considered. An engine with hybrid carburetion is compared with a traditional diesel engine.     

Kinetics of phase transformations in the surface layer of a binary alloy upon selective dissolution. IV. Ag-Pd|Ag<Superscript>+</Superscript> system

Critical parameters of the morphological development of an electrode surface at the anodic oxidation of silver-based Ag-Pd alloys are estimated. Conditions (potential range and compositions of the alloy and electrolyte solution) of the true selective dissolution of the alloys in an acidic nitrate medium are determined. The nature and kinetic parameters of the nucleation step of the phase transformation of palladium in the surface layer of Ag4Pd and Ag8Pd alloys at the over-critical potentials are found.     

Effect of Particle-Size Distribution on Wall Friction in High-Velocity Gas-Dynamic Apparatuses

The mechanism of the friction of particles of a polydisperse material on the channel wall is considered under the assumption the friction loss of energy is caused by multiple semielastic collisions of the particles against the wall. A model is suggested for calculating energy losses in the design of the nozzles and vortex chambers of jet mills. A parametric study of the model is carried out, and the effect of particle friction on the parameters of the gas–particle flow is evaluated for these apparatuses.     

PVC materials with sorption-active surface of ethanol cyclam nanofilms

Materials with sorption-active nanofilms based on PVC materials with surface layers modified into ethanol cyclam nanofilms were obtained, based on which new functional materials with given properties can be developed. The properties and molecular structure of ethanol cyclam nanofilms with different sorption-active surfaces were studied using physicochemical research methods.