Using the simulation modeling with stochastic estimation of trafficability of forest transport systems

Forecasting trafficability of logging and forest transport systems on the ground, which have a multi-sectional layout solution is considered in the paper. Trafficability problems are evaluated from the point of view of the stochastic character of indicators of traction properties - the forces of resistance to movement and the adhesion force of the driving wheels with the supporting surface. With the stochastic estimation of trafficability the law of Gaussian distribution for random values of the rolling resistance coefficient and the two-parameter Weibull distribution law with a negative asymmetry coefficient or values of the shape parameter greater than 4 for the cohesion coefficient was adopted. A stochastic approach to the evaluation of trafficability allows to ensure a rational distribution of the power flows between propulsors of the transport-technological system, which is shown in this paper. © 2019 Published under licence by IOP Publishing Ltd

Using the simulation modeling with stochastic estimation of trafficability of forest transport systems

Forecasting trafficability of logging and forest transport systems on the ground, which have a multi-sectional layout solution is considered in the paper. Trafficability problems are evaluated from the point of view of the stochastic character of indicators of traction properties - the forces of resistance to movement and the adhesion force of the driving wheels with the supporting surface. With the stochastic estimation of trafficability the law of Gaussian distribution for random values of the rolling resistance coefficient and the two-parameter Weibull distribution law with a negative asymmetry coefficient or values of the shape parameter greater than 4 for the cohesion coefficient was adopted. A stochastic approach to the evaluation of trafficability allows to ensure a rational distribution of the power flows between propulsors of the transport-technological system, which is shown in this paper. © 2019 Published under licence by IOP Publishing Ltd

Investigation of the effect of preliminary modification of solutions on the properties of precipitated hydrated zirconium oxides

In this study, hydrated zirconium oxides and yttrium stabilized zirconia powders were synthesized by precipitation. Influence of preliminary solution modification, namely preliminary heating of the solutions and the addition of sulfate ions was investigated. It is shown that the addition of sulfate ions leads to a decrease in the size of aggregates and an increase in the specific surface area of the particles. The greatest increase in the specific surface area was observed during precipitation of a preliminary heated solution with the addition of sulfate ions. © Published under licence by IOP Publishing Ltd.Ministry of Education and Science of the Russian Federation, Minobrnauka: 14.581.21.0028, RFMEFI58117X0028Research and DevelopmentThe work was supported by Act 211 Government of the Russian Federation, contract № 02.A03.21.0006.The study was financially supported by the Ministry of Education and Science of the Russian Federation within the framework of subsidizing agreement of October 23, 2017 (No. 14.581.21.0028, unique agreement identifier RFMEFI58117X0028) of the Federal Target Program “Research and development in priority directions of the progress of the scientific and technological complex of Russia for the years 2014–2020.” 5. References [1] Chandra N, Singh D K, Sharma M, Upadhyay R K, Amritphale S S and Sanghi S K 2010 Journal of Colloid and Interface Science 342 327–332 [2] Si-Jia Hao, Cheng Wang, Tong-Le Liu, Zhi-Ming Mao, Zong-Qiang Mao, Jian-Long Wang 201

THE PRODUCTION OF LAYER YTTRIUM HYDROXONITRATES WITH CONTROLLED PROPERTIES

The work shows that the pH value of the precipitation has a significant effect on the yttrium hydroxonitrates properties. It is shown that at pH =8 particles have a regular shape close to spherical that is caused by layer-by-layer build-up of nucleus during precipitation

CREATION OF DENTIST CERAMICS BASED ON YTTRIUM OXIDE

In this paper, it is shown that the pH value of the deposition affects the value of the specific surface area and the dimensions of the OCR of yttrium oxide. The obtained ceramics based on yttrium oxide differs in density and linear shrinkage.В данной работе показано, что значение pH осаждения влияет на значение удельной поверхности и размеры ОКР оксида иттрия. Полученная керамика на основе оксида иттрия различается по плотности и линейной усадке.Работа выполнена при финансовой поддержке Минобрнауки России, соглашение о предоставлении субсидии от 23.10.2017 г. № 14.581.21.0028 (уникальный идентификатор соглашения RFMEFI58117X0028), в рамках ФЦП «Исследования и разработки по приоритетным направлениям развития научно-технологического комплекса России на 2014–2020 годы»

INFLUENCE OF THE HEAT TREATMENT REGIME ON THE PROPERTIES OF HYBRID LUMINOPHOR POWDERS OBTAINED ON THE BASIS OF LAYERED HYDROXIDE OF GADOLINIUM-TERBIUM

In this work, hybrid phosphors based on layered Gd-Tb nitrate hydroxide, synthesized by controlled double-jet precipitation, as a result of intercalation of salicylate and terephthalate ions, were obtained. The effect of the heat treatment regime on the structure and intensity

SYNTHESIS OF OXIDE FILMS BASED ON YTTRIUM AND EUROPIUM

This article describes a method for obtaining oxide films based on rare-earth elements at different calcination temperatures and comparing their luminescence. The precursor for these films is layered hydroxide Y: Eu, obtained by precipitation at a constant pH value of 8.В данной статье описывается способ получения оксидных пленок на основе РЗЭ при разных температурах обжига и сравнение их люминесценции. Прекурсором для этих пленок является слоистый гидроксид Y: Eu, полученный осаждением при постоянном значении pH равное 8.Работа выполнена при финансовой поддержке Минобрнауки России, соглашение о предоставлении субсидии от 23.10.2017 г. № 14.581.21.0028 (уникальный идентификатор соглашения RFMEFI58117X0028), в рамках ФЦП «Исследования и разработки по приоритетным направлениям развития научно-технологического комплекса России на 2014–2020 годы»

Modelling of technological machines motion

The software for modelling dynamic processes of technological machines drive mechanisms using algorithmic language PYTHON. © Published under licence by IOP Publishing Ltd

Optimal selection of the parameters of the kinematic chain of the main drive of the cold rolling mill

The article is devoted to the choice of optimal parameters of the system of dynamic balance of loads in the mechanism of the cyclic action of the drive of the working stand of the cold rolling mill. © Published under licence by IOP Publishing Ltd