Ion composition and qualitative indicators of water within the Chernozemelskaya water-irrigation system

In Russia, the agro-industrial complex is a large consumer of water resources, which are used to supply water to rural settlements, food and processing industries, livestock complexes and poultry farms, irrigation of land, flooding of pastures and haylands, as well as for fishing, recreation and other purposes. To a large extent, the environmentally safe, cost-effective and socially oriented development of the region depends on the state and functioning of reclamation systems. The paper presents the results of long-term monitoring of the geochemical composition and water quality indicators of the Chernozemelskaya water-irrigation system (from 2002 to 2018) located on the territory of the Caspian lowland. Irrigation and drainage and surface waste of the system are found to have a level of mineralization ranging from 1.2 to 2.3 g/l with sulfate-chloride and chloride-sulfate, sodium chemism, while the medium activity is low and intermediate-mafic (pH=7.8-8.4). It is analyzed that the high level of Cl-, Na+, Мg2+ ions in irrigation water can cause salinization and alcalination of all types of soils. © 2020 Institute of Physics Publishing. All rights reserved

Effect of variable mode flight of a navigation element

В статті представлений аналіз виникнення помилок в обчисленні шляхової швидкості та кута зносу літального апарату при зміни профілю польоту. Проаналізовано усі складові помилки, пов’язані зі зміною кута тангажу, що суттєво впливають на результати обчислювань.В статье представлен анализ возникновения ошибок в вычислении путевой скорости и угла сноса летательного аппарата при изменении профиля полета. Проанализированы все составляющие ошибок, связанные с изменением угла тангажа, которые существенно влияют на результаты вычислений.The article analyzes errors in calculating the ground speed and drift angle of the aircraft in the presence of changes in flight profile. Analyzed all components of the errors associated with changes in pitch angle, which significantly affect the results of the measurements

Numerical simulation of loads and impacts, stress-strain state, strength and stability of unique structures, buildings and facilities. Experience of StaDyO research & engineering centre

The paper contains analytical overview of the most important unique/critical objects and the computational analysis problems of the mechanical safety, carried out by the team of Research & Development Centre StaDyO (StaDyO R&D Centre) researchers for the last two years (2016-2018). Corresponding complex coupled problems of continuum mechanics were solved with the use of contemporary methods and models of numerical modeling (nonlinear models, coupled problems, substructures, submodeling, etc.), implemented in verified software complexes. Some of these results are briefly considered and analyzed. Conclusions about the main directions of further research and development are presented as well. © Published under licence by IOP Publishing Ltd