bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dependence sandy soil thermal conductivity on grain-size composition
Authors: Zakharov A V , Makhover S E 
Published: June 2021

Abstract
The development of renewable energy sources technologies is relevant. Sun radiant energy, wind energy, water energy, earth low-potential energy are main renewable energy sources. Energy foundations are used for earth low-potential energy extraction. The research results this paper presented can be used for energy foundations calculations. It is necessary to know soil thermal characteristics to the energy foundations calculations. At the moment, there are many calculation methods for determining soil thermal characteristics, but none of them take into account their grain-size composition. The research purpose is to assess the dependence sandy soil thermal conductivity on grain-size composition. According to the research results, firstly, the influence of the density and moisture content of the soil on its thermal conductivity was confirmed, and secondly, it was established that, at the same moisture content and density, the size of the soil grains matters. Particle size distribution affects the sandy soil thermal conductivity. With an increase in the particle size, sandy soil thermal conductivity increases.
Features of clay soil deformation under triaxial block regime cyclic loading, taking into account the formation of micro and macro-cracks
Authors: Mirsayapov I T , Sharaf H M A 
Published: June 2021

Abstract
The main purpose of this paper is to study the parameters of strength and deformation of clay soil in conditions of triaxial compression under block regime cyclic loading. To date, there are no data on the results of studies under this loading mode. Theoretical and experimental studies of the strength and deformability of clay soil of triaxial compression 0^02=03 under block regime cyclic loads are carried out. A distinctive feature of the experimental studies is that they were carried out in devices of triaxial compression of a prismatic shape with an aspect ratio of 100x 100x200mm. In the study of vibration creep deformations and changes in the fatigue resistance to the destruction of clay soils under triaxial regime block cyclic loading. It is established that the stress-strain state, deformation, and fatigue strength of soil vary depending on the sequence of alternating blocks with different values of the maximum load of the cycle. The developed and obtained equations describing the deformation of the soil under these conditions with the development of micro-cracks observed in experiments of hardening and softening effect of inhibition at different stages of cyclic triaxial compression allow to accurately estimate vertical deformation (settlement) bases under regime loading and to obtain reliable and economical design solutions.
Method for calculating the settlement of ring pile foundations of tanks
Authors: Polishchuk A I , Shmidt O A 
Published: June 2021

Abstract
Annotation. A method for calculating the settlement of ring pile foundations of reservoirs on clay soils is considered. The proposed method provides for a separate calculation of the settlement of the central part of the tank (bottom draft) and a reinforced concrete ring pile foundation arranged along its edges (foundation ring settlement). The bottom of the tank is not rigidly connected to the ring foundation. The method of M I Gorbunov-Posadov and others for a flexible round foundation on a linearly deformable base was used. When calculating the settlement of the pile ring, the method of A A Bartolomey was used for strip pile foundations. The work takes into account the assessment of the additional settlement of the bottom and pile ring caused by repeated loading and unloading of the base of the tanks.
The choice of a metal sheet piling for the construction of the foundation pit
Authors: Nazarova E V , Kaloshina S V , Zolotozubov D G 
Published: June 2021

Abstract
Sheet piles are often used for fencing deep excavations. This is due, among other things, to the fact that when they are pressed, there is no negative impact on the surrounding buildings. In the course of the study, a technical and economic comparison of the domestic sheet pile L4 and its foreign analogue VL603K was carried out. The relevance of the study is confirmed by the fact that during the construction of underground parts of buildings and structures, great attention is paid to engineering measures to prevent the ingress of groundwater into the pits, as well as to strengthen the walls of the excavations from the possibility of collapse in unstable and water-bearing soils. It is also taken into account that the choice of the foundation pit construction depends on its depth, the level of groundwater and the structural scheme of the underground part of the structure, it is also necessary to carry out a static calculation to determine the thickness of the fence and its immersion depth. The analysis of sheet piles also revealed their disadvantages and advantages.
Advantages of using BIM (BIM-technology) for the design and construction of subsoil use industry buildings and structures
Authors: Shenkman R , Ponomaryov A 
Published: June 2021

Abstract
The article provides information about the advantages of using information modeling technologies in the design and construction of facilities for subsoil use enterprises. The data on the state of the art of studying the aspects of the application of information modeling technologies in the field of industrial construction are presented. Recommendations for planning methods and the development of information models of buildings and structures of subsoil use objects are presented on base of the study of existing research. The article also provides information on the test information models of subsoil use industrial facilities which are necessary for the development of recommendations for the choice of levels of the attribute information of elements, for the correct and effective use of models at all stages of the object’s life cycle.
Numerical analysis and practical application of methods for strengthening foundations with piles during reconstruction process
Authors: Polischuk A I , Petukhov A A 
Published: June 2021

Abstract
The article describes the reconstruction of the historical stone building basements. It provides a brief description of the constructive solution of the buildings under consideration and summarizes information about their technical condition. The article highlights the importance of analyzing information about the construction and operation of buildings during the entire history. This article lists the main tasks of the reconstruction of historical buildings: area augmentation due to the reconstruction of previously unexploited basements, deepening of basements, expansion of existing openings in the walls and construction of new ones, arrangement of new entrance nodes into the basements of a building, etc. Besides, the article gives a brief description of the soil conditions of the reconstructed buildings sites, which are typical for historical buildings in Tomsk. It points out the need for thorough engineering and geological examinations with additional geotechnical examination of the soil base. Additionally, the paper clarifies the necessity to examine the characteristics of supporting layer foundation soils, changed due to their compaction by the weight of the building during the period of long-term operation. The results obtained during the examination and assessment of the technical condition of foundations and overhead building structures will be presented. Also, this study proposes classification of methods for strengthening natural foundations (freestanding, strip, slab and massive) using piles. In particular, it talks about piles that are installed without soil extraction - displacement piles (pressed and injected), as well as examples of numerical modeling of the work of detached and strip foundations reinforced with the use of piles when the basement floor elevations are lowered. Finally, it shows he experience of scientific and technical support for the reconstruction of buildings.
Electron-deficient N-oxyl radicals – new reagents for selective oxidative functionalization of organic substrates
Authors: Krylov I B , Budnikov A S , Lopat’eva E R , Segida O O , Paveliev S A , Terent’ev A O 
Published: June 2021

Abstract

N-oxyl radicals are well known as one of the richest classes of long-living free radicals. They are widely used as redox catalysts, mediators of living polymerization, contrast reagents for tomography applications, spin labels for biomacromolecule studies, components of organic batteries and magnetic materials. In the last decade, less stable but more reactive electron-deficient N-oxyl radicals have been harnessed as reagents for oxidative functionalization of organic substrates via selective C-H bond cleavage or radical addition to C = C bonds. Wide array of C-O coupling products can be achieved employing N-oxyl radicals as O-reagents for oxidative C-O coupling. Selected examples of methods for oxidative functionalization of organic substrates by N-oxyl radicals developed in our group are summarized in the present paper.
Semi-empirical evaluation of linear coefficient of thermal expansion of metals
Authors: Palii N A , Belousov O K 
Published: June 2021

Abstract
The paper considers various semi-empirical methods of the linear coefficient of thermal expansion (CTE), a, calculation. Debye-Grüneisen model was used as a basis and adjusted by taking account of thermodynamic (molar heat capacity, enthalpy) and elastic (Young, bulk, and shear moduli, Poison ratio) characteristics of metals. The formulas for numerical calculations of CTE are derived using: (1) elastic longitudinal modulus, (2) microscopic constants, and (3) enthalpy. CTE were calculated for 25 metals, Ge and Si, and five hexagonal single-crystals in directions perpendicular and parallel to the principle crystallographic axis. Theoretical values of a show good agreement with the experimental ones.
Apparatus and technological design of the production process of activated highly porous carbon material
Authors: Popova A A , Shubin I N 
Published: June 2021

Abstract
The possibility of developing activated highly porous carbon materials with a maximum specific surface area is shown. Their classification, the main stages of research and the results obtained are considered. A schematic diagram of the production of a material with a BET specific surface in the range of 2400-3600 m2 / g is presented. The main stages in the production of an activated highly porous carbon material have been determined, including the preliminary carbonization of carbon raw materials, its alkaline activation and post-processing of the resulting material (from the pre-preparation of the components and the preparation of the reaction mixture to the subsequent isolation and drying of the finished product). The composition of the equipment and the possibility of a large-scale transition of the instrumental and technological design of the production process from laboratory to pilot industrial have been established. The obtained activated highly porous carbon material can be used as sorbents in gas media purification systems and in gas accumulators, as well as for solving various environmental problems.
Research of the efficiency of scientific and technical results in the field of chemical safety based on big data analysis
Authors: Pronichkin S V , Mamai I B 
Published: June 2021

Abstract
The search and extraction of targeted information about promising and breakthrough technologies for ensuring chemical safety is an important element in the analysis of large volumes of unstructured scientific and technical data. Existing approaches to processing large amounts of unstructured data can lead to distortion of the original information. New approaches to the search and extraction of target information based on the typification of the display of visualized large volumes of data of scientific and technical programs are proposed. It is proposed to overcome the disadvantages of existing approaches by using the representation of multi-attribute objects based on the multiset formalism, which allows one to simultaneously take into account all combinations of attribute values, as well as a different number of values for each of them. Multi-feature objects presented as multisets are proposed to be divided into relevant and irrelevant in terms of similarity to the reference multiset based on various metrics. This approach makes it possible to level the features of the initial data and opens up opportunities for solving new problems of studying large volumes of unstructured information of various nature. The results of the computational experiments in the chemical engineering field have shown the effectiveness of the proposed methodological approaches to the search and extraction of target information from large volumes of unstructured data of scientific and technical programs.
Dynamics of the number of aphids-vectors of viruses in the vertical zoning of the North Caucasus
Authors: Gazdanova I O , Gerieva F T 
Published: June 2021

Abstract
Viral diseases are recognized as the most dangerous potato diseases due to the fact that their development can bring significant economic losses. Viruses infecting potatoes carry a significant number of vectors. Aphids are carriers of viral diseases. The results of studying aphidofauna showed that the most important carriers of potato viruses in the North Caucasus are aphids-peach, leguminous, large potato, common potato.
The plasma atomization process for the Ti-Al-V powder production
Authors: Kalayda T A , Kirsankin A A , Ivannikov A Yu , Konushkin S V , Kaplan M A , Sevostyanov M A 
Published: June 2021

Abstract
The paper presents brief information on the characteristics of the spherical powder of the Ti-Al-V alloy, produced by the method of plasma atomization of the wire. The scheme of the equipment and the results of studying the powder of the Ti-Al-V alloy are shown.
Introduction of in Vitro Grapes of Interspecific Origin
Authors: Akimova S V , Kirkach V V , Radjabov A K , Panova M B , Voskoboinikov Yu V , Ermorlina M A , Ter-Petrosyants G E 
Published: June 2021

Abstract
During clonal micro-propagation of grapes of interspecific origin of the Aleshenkin variety, it was revealed that the optimal type of explants for initiating a sterile culture are meristematic apexes 100 – 150 μm in height, which are advisable to be planted in test tubes on a nutrient medium according to the prescription of Quorin Lepuavr (QL) (Quoirin & Lepoivre, 1977) enriched with the following substances (mg/l): thiamine (B1), pyridoxine (B6), nicotinic acid (PP) – 0.5 each; 6-BAP – 0.1; inositol – 100; sucrose – 30,000, agar-agar – 7,000 and incubate for 70 days in a light room at an illumination intensity of 2,500 lux, a 16-hour photoperiod and a temperature of 20 – 22 C. At the multiplication stage, with two consecutive passages of 40 days of sub-culturing on a nutrient medium according to the prescription of Murashige and Skoog (MS) (Murashige & Skoog, 1962), enriched with the following substances (mg/l): thiamine (B1), pyridoxine (B6), nicotinic acid (PP) – 0.5 each; 6-BAP – 0.1, inositol – 100; sucrose – 30,000, agar-agar – 7,000, the advantage of this type of explants has been shown. Since in terms of the coefficient of multiplication, regenerant plants introduced into culture in vitro by meristematic apexes after the first passage were 2.3 times and after the second passage 1.4 times higher than the plants introduced into culture by micro-cuttings.
Dense ceramics based on solid solutions
Authors: Ulyanova A V , Senina M O , Lemeshev D O 
Published: June 2021

Abstract
The work compiled the main results of research devoted to the production of high-density nonporous ceramics, namely ceramics based on aluminum-magnesium spinel (AMS). The article discusses questions about the role of reducing the sintering temperature, increasing the performance of the material. A promising solution to these issues is the introduction of modifying additives. Various additives and their mechanism are considered. Particular attention is paid to solid solution-forming agents. The basic laws of the interaction of sintering additives that do not react with the basic compound are described. Possible schemes for the formation of a solid solution for yttrium and gallium oxides are presented. The economic component of the raw materials used is also considered. It was determined that the most advantageous is the use of gallium oxide as an additive, and the diagrams of state of gallium oxide are also given. It has been revealed that the method of introducing the additive on the example of introducing gallium oxide plays an important role in improving the properties of ceramics based on aluminum-magnesium spinel.
Methods of synthesis of yttrium-aluminum granate powders for producing transparent ceramics
Authors: Protasov A S , Senina M O , Lemeshev D O 
Published: June 2021

Abstract
The work examines the latest research on the synthesis of ceramic powders based on yttrium-aluminum garnet. The advantages and disadvantages of various methods are given. The work highlights the achievements and results achieved by researchers in this field at the moment.
Testing the methodology for evaluating the accuracy of the 3d printing
Authors: Davydov R , Polyakov N , Korenchenkova D , Chulkin S , Rud’ V , Krasnoscshekov V 
Published: June 2021

Abstract
The spread of 3d printing in the industry has led to the need to determine the accuracy of reproducible dimensions on a 3d printer. Precision manufacturing of parts is essential in the manufacture of products. The hardware manufacturer provides the user with information on the positioning accuracy of the 3d printer, but this could be a marketing statement. Also, it is very important to know the accuracy of a 3d printer after its upgrade or under the influence of various external factors (ambient temperature, vibrations) inherent in the location of the printer. The purpose of this work was to check the accuracy of a 3d printer and to develop a methodology for assessing the accuracy of a 3d printer by printing a sample product. As a result of the work done, it was found that by measuring various samples of products, it is possible to determine the quality of accuracy for certain structural elements and the average coefficient of accuracy of products. It was also found that the study of a sample product allows us to determine most of the factors affecting the accuracy of manufacturing products.
Study of Biological Properties in in Vivo Experiments OF TI-29NB-13TA-4.6ZR Alloy Samples with a Polymer Coating
Authors: Baikin A S , Sevostyanova T M , Alexandrova A G , Berezina N V , Sergienko K V , Konushkin S V , Baranov E E , Nasakina E O , Kolmakov A G 
Published: June 2021

Abstract
This paper shows the technology of creating a composite material from a Ti-29Nb-13Ta-4.6Zr mass% alloy, which does not contain toxic elements, with a polymer coating based on PLA. Primary in vivo studies were carried out to confirm the non-toxicity of the obtained material and the prospects for further studies.
Biomechanical compatibility study of a nickel-free medical TiNbZr shape memory alloy
Authors: Nasakina E O , Konushkin S V , Sudarchikova M A , Novikova D A , Sergiyenko K V , Kolmakova A A , Mikhailova A V , Shatova L A , Kolmakov A G , Sevostyanov M A 
Published: June 2021

Abstract
Biomechanical compatibility of a Ti-(20-30) Nb-5Zr shape memory alloy was studied. The tensile strength study was carried out. The best properties are observed for the Ti-28Nb-5Zr composition with a wire diameter of 1200 μm, adapted to work in a living organism. The dependence of the change in strength and plasticity on the annealing temperature exhibits minimal extrema. The best characteristics are noted at 800 °C.
Biocompatibility study of a nickel-free medical TiNbZr shape memory alloy
Authors: Nasakina E O , Konushkin S V , Sudarchikova M A , Novikova D A , Sergiyenko K V , Baikin A S , Konushkin S V , Baranov E E , Kaplan M A , Kolmakov A G , Sevostyanov M A 
Published: June 2021

Abstract
Biocompatibility of a Ti-(20-30) Nb-5Zr shape memory alloy was studied in vitro in standard cell medium. The number of cells, the mitotic index, the number of dead cells were estimated. All samples were biocompatible in vitro. Mitochondrial activity and good cell survival were observed. The Ti-28Nb-5Zr alloy has the best characteristics.
Use of chitosan nanoparticles loaded with biologically active substances for pre-harvest plant protection from pathogens (a review)
Authors: Popletaeva S B , Arslanova L R 
Published: June 2021

Abstract
Chitosan is a biopolymer that readily forms nanoparticles, with or without additional biologically active substances loaded into them. Chitosan nanoparticles can include hydrophobic or hydrophilic compounds, metal ions, compounds poorly soluble in water, etc. Chitosan is biodegradable, biocompatible, non-toxic to plants, humans and animals. It also stimulates plant immunity and enhances crop yields. Because of that properties, there are some works about chitosan nanoparticles loaded with biologically active substances for plant protection. The major advantages of these nanoparticles are: good solubility in water, large surface for interaction with the pathogen, possibility of gradual release of active substances, protection of active substances from damage, easy entrance of the nanoparticles into plant cells.
In this review current research works about use of chitosan nanoparticles that are loaded with active substances for pre-harvest plant protection are summarized.
Development of the intelligent lighting control system using Wi-Fi technology
Authors: Briushinin A A , Gureeva I M , Savin D D , Diuldin M V 
Published: June 2021

Abstract
The article considers the use of an intelligent lighting control system as one of the ways to reduce the negative impact of electromagnetic radiation in the visible range on the human visual organs. The developed algorithm of the system determines the most optimal value of the voltage on the lighting elements based on the comparison of the data on the value of illumination in different areas of the room, providing not only a comfortable environment for the eyes in the workplace, but also an electric energy saving of at least 15 %.
Development of an ecological lighting device to reduce the growth time of agricultural plants in greenhouses
Authors: Cheremisin A V , Gureeva I M , Briushinin A A , Savin D D , Mozhayko A A 
Published: June 2021

Abstract
The use of LEDs in lamps is promising for effective plant growth. Plant growth lamps are designed to create artificial lighting for agricultural crops. This work is devoted to the creation of a smart LED lamp with the ability to adjust the spectral composition of radiation depending on the stage of growth and the type of plant. A number of experiments were carried out to investigate the effect of various radiation parameters on the growth characteristics of dill, parsley, green onion and cucumber seeds. The optimal radiation parameters that contribute to the acceleration of the selected model plants growth were identified. Based on the results obtained, a multi-wavelength LED lamp with an adjustable radiation composition, including blue 440 nm and red 660 nm LEDs, was developed. In the lamp, the possibility of changing the spectral composition of radiation at different stages of growth was realized. Therefore, it is possible to change the light parameters in accordance with the obtained data on the development of crops.