Production of nanoporous sorbents by partial steam-air conversion of charcoal

An effective sorbent is activated carbon having a developed nanoporous structure with an average pore diameter about 2-4 nm. Perspective method of activated carbon production is the partial steam conversion of the coal bed in boiler furnaces of power plants. The additional thermal energy is produced by burning the syngas. The aim of this work is to study the co-production of activated carbon and syngas by partial steam-air conversion of charcoal. Due to the presence of oxygen in the flow, intensification of conversion occurs. In the laboratory bed reactor, the mass loss curves and the syngas composition were obtained at temperatures of 800°C and 900°C. Two zones with different reaction mechanisms were identified on the height of the bed. The reactions between carbon and steam shift toward hydrogen formation in the oxygen zone. The dependence of the porous structure of the activated carbon on the conversion degree of the raw material is obtained. The maximum of micropores is formed at a conversion degree of 0.5. The material and energy balance of the partial conversion in the laboratory reactor was estimated. © 2018 Institute of Physics Publishing. All rights reserved.Russian Foundation for Basic Research (RFBR

Дозиметр ультрафиолетового излучения

Розглянуто проблему, пов'язану з впливом ультрафіолетового (УФ) випромінювання Сонця на організм людини. Описано особливості розробки і експлуатації вітчизняного портативного дозиметра УФ-випромінювання ФС-01.Considered problem connected with the impact of Sun ultraviolet (UV) radiating on the human organism. Described particularities of development and usages domestic portable sensor of UV-radiating ФС-01.Рассмотрена проблема, связанная с воздействием ультрафиолетового (УФ) излучения Солнца на организм человека. Описаны особенности разработки и эксплуатации отечественного портативного дозиметра УФ-излучения ФС-01

The thermal expansion and thermophysical properties of an aluminum and Al/B 4 C composite

The paper presents results of experimental studies of the thermal expansion and thermophysical properties of an Al/B 4 C composite with a boron carbide content of 20 wt% and technically pure aluminum in the temperature range from 100 to 600°C to evaluate the possible use of this composite as a neutron-protective material in the nuclear industry. © 2017 Author(s).We would like to appreciate the assistance of S. M. Zadvorkin, S. V. Lepikhin and L. S. Goruleva in conducting the investigations. Investigation was supported by Act 211 of the Government of the Russian Federation (agreement No. 02.A03.21.0006)

An Analytical Model for Calculation of the Steel Hardness after Continuous Cooling

A number of modern engineering steel grades were analyzed using the CCT diagrams plotted by means of the dilatometer. The statistical analysis of the experimental data allowed for the determination of the equations connecting the critical cooling rate to achieve fully martensitic microstructure and the martensite hardness with the chemical composition of the steel. The dependence of the steel hardness on the cooling rate in the range of 0.1...30 C/s was determined. It was shown that this dependence had the logarithmic character for every studied steel grade. The equations connecting the coefficients of the logarithmic function with the chemical composition of steel were obtained. © Published under licence by IOP Publishing Ltd.The work was supported by the Act 211 of Government of the Russian Federation, contract № 02.A03.21.0006, the Ministry of Science and Higher Education of the Russian Federation, project №11.1465.2014/K, and by the state assignment of the M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, theme “Laser”

Optimization of the thermodynamic and thermophysical properties of the gas turbine cycle working fluid

A gas turbine cycle working fluids group based on their production technology and application is presented. The energy parameters analysis procedure of unclosed and closed gas turbine cycles is described. The comparison of the effect of the working fluids thermophysical and thermodynamic properties variations on the useful work l0 of both unclosed and closed gas turbine cycles is presented. The effect of the fuel gas composition variation on the useful cycle work l0 is revealed. The effect of the working fluid thermophysical properties variation on the gas turbine cycle optimal combination of thermodynamic properties (T3 and P3 ) is presented. © Published under licence by IOP Publishing Ltd

The kinetic parameters of peat conversion an oxidizing and inert media

В статье приведены экспериментально полученные данные технического анализа воздушно-сухого торфа, описаны особенности его применения в качестве энергетического топлива. Получены данные по скорости конверсии в инертной и окислительной среде при неизотермическом нагреве, проанализированы стадии разложения торфа в зависимости от степени конверсии образца. На основе проведенных исследований рассчитаны кинетические параметры конверсии для стадий выхода летучих и выгорания коксового остатка.The article presents the experimental data of the technical analysis of air-dry peat, the features of its use as an energy fuel are describes. The data on conversion rate in inert and oxidizing environment under non-isothermal heating, the decomposition stage of peat analyzed in the depending on the sample conversion degree. Based on these studies the kinetic conversion parameters for the yield of volatile and burning coke stages are calculated.Исследование выполнено в Уральском федеральном университете за счет гранта Российского научного фонда (проект №14-19-00524)

КЛАССИФИКАЦИЯ ВЕТВЯЩИХСЯ ДИСКРЕТНО НОРМИРОВАННЫХ ГЕНЗЕЛЕВЫХ ИНВОЛЮТИВНЫХ СЛАБО РАЗВЕТВЛЁННЫХ АЛГЕБР С ДЕЛЕНИЕМ

The aim of the paper is to classify ramified division algebras with unitary involutions over discretely valued Henselian fields in terms of their residual algebras and special generators.Сообщение ставит своей целью классификацию слабо разветвлённых ветвящихся алгебр с делением, обладающих унитарными инволюциями, над гензелевыми дискретно нормированными полями в терминах их алгебр вычетов и специальных образующих.