bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation of the main mechanical characteristics of plastics for three-dimensional printing of machine parts models
Authors: Dorodov P V , Kasatkin V V , Kasatkina N Y , Petrov V A , Litvinyuk A A 
Published: March 2021

Abstract
Today, new methods of manufacturing complex parts using three-dimensional printing are being introduced in engineering, including in the mechanical engineering of agricultural machinery. This technique is also used in the design of agricultural machinery at the stage of physical modeling of their structures to determine certain properties of the product as a whole and its individual parts (details) on the corresponding models. Physical modeling is used when it is difficult to perform full-scale tests of the product, as well as for economic reasons. The necessary conditions for physical modeling are the geometric and physical similarity of the model and kind. The presence of such proportionality allows us to recalculate the experimental results obtained for the model in kind by multiplying each of the determined values by a constant multiplier for all values of this dimension – the similarity coefficient. However, to study the physical characteristics of a product, it is necessary to take into account the mechanical properties of the material of its model. From various sources, you can find the main mechanical characteristics of plastic threads or samples made on a 3-D printer. Their values vary greatly depending on the model manufacturing technology. The paper presents the results of a study of the physical and mechanical properties of polylactide (PLA) and polyethylene tereflatate (PET-G), which are used in the manufacture of parts by three-dimensional printing. The specific strength of polymers was respectively: for PLA 65.6…12.2 kPa·m3/kg, for PET-G 36.7…95.4 kPa·m3/kg. Specific plasticity for PLA is equal to 60.,3 %· cm3/kg, for PET-G – 468.2 %· cm3/kg. The specific plasticity for PLA is 608.3 %· cm3/kg, for PET-G – 468.2 %· cm3/kg. Mechanical properties are investigated and the obtained mechanical characteristics must be taken into account when calculating and physically modeling plastic products for three-dimensional printing.
The improvement in the methods for estimating the nature of the working process of an internal combusting
Authors: Plotnikov S A , Buzikov S V , Lanskikh Y V , Kartashevich A N 
Published: March 2021

AbstractThe urgency of mathematical simulation and electronic processing of obtained experimental data for estimating the working process increases by the day. The solution of real-world problems requires high-speed computer programs that enable us to reliably simulate complex processes occurring in engines and to simplify a considerable part of research effort. In connection with these considerations, the aim of our investigation is the improvement in the methods for estimating the nature of the working process of an internal combustion engine by applying CNIDI techniques for processing indicator diagrams by designing a hardware and software package. The package is able to present the obtained design data of heat-generation law values in a readable form of a digital model that enables us to produce their subsequent export into other software products for further research. The novelty of our work lies in developing a program for personal computers which is able to process experimental indicator diagram obtained in any form and by any technique for acquisition of heat-generation values. The main purposes of our investigation are the analysis of existing CNIDI techniques of processing indicator diagrams, the algorithm design of computer software operation and the verification of data obtained by programmed methods with design data. We found that applying the technique of processing experimental indicator diagrams is one of the methods most reliably describing the processes occurring in diesel cylinders. We analyzed the theoretical basics of a fuel combustion process by using experimental indicator diagrams, examined taking into account imprecision of source data, and validated ways of updating the data. We upgraded the computer program aimed at the methods of heat-generation data calculation under combustion according to specified diagrams. The use of introduced CNIDI techniques and the appropriate program of indicator diagram analysis provide the required quality of results in investigating the influence of various factors on fuel combustion process in an engine.
Studies of thermal resistance of heated flogopite
Authors: Fedorova S V 
Published: March 2021

Abstract
Research on thermal stability of mineralogical types of micas deals with materials with high thermal stability. At high temperatures, as a result of water release, mica loses its transparency, swells, stratifies and becomes mechanically unstable. Due to these changes, the properties of mica worsen. Phlogopites can vary in their quality. Therefore, when phlogopite is used in materials and devices operating at very high temperatures, it is necessary to use the type of mica whose thermal resistance meets the operating conditions.
The effectiveness of the introduction of new test equipment taking into account the use of the PLP-01M microwave laboratory system
Authors: Chuprakova A M , Anichkina O A , Vorobyev D I , Ovsyannikova A V , Petuhova E P 
Published: March 2021

Abstract
The introduction of the PLP-01M microwave laboratory system introduces a limitation on the number of studies per year, which reduces the capabilities of the measuring device, in cases both for the simultaneously introduced atomic absorption spectrometer “Kvant-2AT” and for the already used atomic absorption spectrometer “Kvant-AFA ”. The introduction of the PLP-01M microwave laboratory system will be beneficial if the productivity of the new equipment meets the laboratory’s needs in the number of studies. The use of the PLP-01M microwave laboratory system will make it possible to implement one of two options for the pricing policy of the laboratory management: when the estimated price per unit of research is established, the competitiveness in the market for the services provided significantly increases; the establishment of the market price allows increasing revenue by 1.2 times, which will amount to 883 thousand rubles. additional income.
The effectiveness of the introduction of new equipment in the test laboratory center
Authors: Petuhova E P , Bogonosova I A , Vorobeva A V , Sagina O A , Hodak S E 
Published: March 2021

Abstract
Improving the quality of the services provided by updating the laboratory base is considered as one of the most important ways to increase competitiveness, achieve competitive advantages, which, in turn, helps to increase the economic efficiency of the testing laboratory center. The introduction of new equipment at the TLC will contribute to an increase in the possible number of studies being carried out, a decrease in random errors, and the achievement of the best indicators of internal laboratory control. The introduction of the PLP-01M microwave laboratory system will significantly reduce the time for preparing a sample for analysis by reducing the decomposition time of the sample by 19.5 times. Upgrading the equipment used from Kvant-AFA to Kvant-2AT with the simultaneous introduction of the PLP-01M microwave laboratory system will not only improve the used measuring instrument, but also the entire sample preparation system as a whole.
Methods of modeling the performance of gas pipeline facilities
Authors: Savicheva Yu N , Shishkina A D , Valiullina G N , Gamazin V A 
Published: March 2021

Abstract
Control systems and parameter monitoring systems are currently being implemented in technical systems and, thereby, are improving them. As a result, in production, in the process of management, there is a need for special mathematical methods that allow making scientifically sound decisions. This is especially relevant in pipeline transport, and in particular in the gas industry, when solving the problems of mathematical modeling of processes and optimizing gas transportation modes. Simulation of equipment operation modes has already been put into practice and is an integral part of the operational control of the gas transportation system
Results of comparative research methods for arsenic content in meat samples of broiler chickens
Authors: Rebezov M B , Shariati M A , Shinkarev Ia K , Tarasova A A , Zubkova E S 
Published: March 2021

Abstract
The development of effective algorithms for optimizing the laboratory equipment base is one of the urgent tasks. Arsenic is classified as a toxicant of the highest hazard group; it is a highly toxic cumulative poison with a broad spectrum of action. The paper considers an assessment of the method for researching the content of arsenic in meat and meat products. The results of investigations (by the methods of photoelectric colorimetry and stripping voltammetry) on the operational control of the error using the method of additions and the assessment of precision were recognized as satisfactory. Comparative analysis of two methods of photoelectric colorimetry and stripping voltammetry in assessing the content of arsenic in samples of broiler chicken meat showed their relevance in the development of laboratory practice. 45.2%) over other ranges. The least registered sample results (1.1%) with the range of obtained data - 0.1-1.0 mg/kg.
Internal audit of compliance with requirements of industrial safety, labor and environmental protection and its impact on safety of oil companies
Authors: Kinghabaeva G N , Savicheva Yu N 
Published: March 2021

Abstract
The article is devoted to the study of the oil industry in Russia. In particular, the monitoring of the system for ensuring the industrial and environmental safety of oil enterprises is being studied in order to reduce the risks of accidents and unforeseen situations. Audit was selected as one of the monitoring tools. The audit process was considered at example of diesel hydrotreating unit of L-24-7 fuel located on the territory of the PJSC Bashneft Bashneft - UNPZ refinery. Based on the analysis, a block diagram of the audit process was compiled and an approximate form of the audit report at the diesel hydrotreatment plant was presented. Based on the results of the study conducted on system monitoring for compliance with the requirements of industrial safety, labor protection and the environment, it was concluded that it is necessary to conduct an audit of this plant in a timely and regular manner. This, in turn, will increase the likelihood of identifying weaknesses and corresponding risks in the early stages of the development of the problem.
Comparative analysis of methods of photoelectric colorimetry and stripping voltammetry in assessing the content of arsenic in sea bass samples
Authors: Rebezov M B , Shariati M A , Artyukhova S I , Kolosovskaya I I , Trofimova E I 
Published: March 2021

Abstract
The development of effective algorithms for optimizing the laboratory equipment base is one of the urgent tasks. Arsenic is classified as a toxicant of the highest hazard group; it is a highly toxic cumulative poison with a broad spectrum of action. The paper considers an assessment of the method for investigating the content of arsenic in sea bass. The research results (by the methods of photoelectric colorimetry and stripping voltammetry) on the operational control of the error using the method of additions and the assessment of the precision were found to be satisfactory. The monitoring results are presented, namely the results indicate that in the range from 0.02 to 0.05 mg of arsenic per 1 kg of sea bass, k prevails (28.1%) over other ranges. The least registered sample results (20.8%) with a range of obtained data are less than 0.02 mg/kg.
Kinetics of carbonation of light lanthanides
Authors: Kashurin R R , Gerasev S A , Svakhina Ya A , Litvinova T E 
Published: March 2021

Abstract
The article provides the problem of extracting rare earth metals from technogenic raw materials. The analysis showed that there is no effective technology. It is required to consider the thermodynamic and kinetic parameters of the carbonization process. The process of carbonization of sediments of light lanthanides is considered. The work determines the effect of temperature and degree of mixing on the extraction process. The activation energy of the process was calculated. The equation for the dependence of the reaction rate on temperature is given It was shown that the process of carbonization of light lanthanides proceeds in the diffusion region.
Bioindication of toxicity and mutagenicity of the environment
Authors: Vasilevskaya N V , Sikalyuk A I 
Published: March 2021

Abstract
The article presents the results of studying the impact of industrial emissions of enterprises of the city of Murmansk on the fertility of pollen of Sorbus gorodkovii Pojark (Gorodkov’s rowan) – an endemic species of East Fennoscandia. A low level of pollen fertility (35 – 52%) was revealed, especially in the vicinity of the local heating plants, operating on fuel oil. In the samples from all sites, a high proportion of sterile pollen grains was noted (48 – 65%). A significant increase of the proportion of sterile pollen of rowan in the vicinity of industrial enterprises of the city of Murmansk indicates the mutagenic effect of their emissions on the male generative system of S. gorodkovii and the process of gamete formation.
Seasonal changes in the woody plants development in an urbanized environment
Authors: Tokareva T G 
Published: March 2021

Abstract
The features of the phenological development of woody plants in green urban plantations in the dry steppe zone have been studied. The phenological phases of woody plants and shrubs are described and analysed: the beginning of bud swelling, the beginning of bud opening, the beginning of leaf opening, the beginning of flowering, the end of flowering, the beginning of fruit ripening, and mass loss of mature fruits. The onset of phenological seasons for the steppe zone has been determined. Formed groups of plants according to the terms of leafing and flowering. The calendar dates of the onset of phenological phases of trees and shrubs in an industrial urban environment are analysed. The sum of effective temperatures for the main phenological phases of woody plants in the steppe zone has been determined. Decorative dendrological groups have been developed for phenological phases of leafing and flowering of woody plants for urban landscaping in the dry steppe zone. Practical recommendations are given for grouping plants by flowering time for landscape construction.
Parameters of Cantharellus cibarius Fr. ecological range fragment and resilience to human impact in taiga and sub taiga forest communities
Authors: Luginina E A , Sorokina A A 
Published: March 2021

Abstract
The paper present results of analyses of plant communities with Cantharellus cibarius Fr. in southern taiga and sub-taiga forests within Kirov region. Golden chanterelle occurs mostly in pure pine forests and pine forests mixed with spruce and birch, of green-moss, lichen and cowberry types; in young to maturing stands; crown density low or medium. Species richness of herbaceous-shrub storey in the studied communities varied from 5 to 29. Ecological preferences of C. cibarius habitat fragment, defined with Ellenberg’s (1974) scales, allow to characterise the species as the following: temperate climate species, shade-resistant, rarely found in conditions of total shading; mesophyte regarding soil humidity, prefers acidic soils with low nitrogen, but, as an exception, marked on neutral soils rich in nitrogen. Differences in the species ecological preferences in conditions of southern taiga and sub-taiga are insignificant. Hemeroby index varied from 0.05 to 0.33 for studied communities. Average share of species tolerant to human impact was 13.23%, and the share of anthropo-phobic species – 86.77%. These data characterise C. cibarius as the species capable of tolerating moderate human impact in southern taiga subzone, but being less tolerant to human impact in sub-taiga areas and coniferous-broadleaved forests.
The current stage of botanical research in L M Cherepnin Herbarium
Authors: Antipova E M , Tupitzina N N , Atschisova N V 
Published: March 2021

Abstract
The modern stages of the vegetation cover research of Krasnoyarsk region by botanists of Krasnoyarsk State Pedagogical University named after V.P. Astafiev is characterized by floristic and geobotanical research of the areas of the southern part of Krasnoyarsk region, including Khakassia, which were understudied in the past, such as northern forest-steppe, southern steppes, subtaiga territories, mountain communities, with the compilation of sketches and classifications of vegetation. In the north, the Angara-Chuna interstream (Boguchansk region) was explored; the fieldwork was carried out in Evenkia in the Podkamennaya Tunguska area. A new direction of research in the region is the study of urban flora in Krasnoyarsk, Sosnovoborsk, Zheleznogorsk, Divnogorsk, and Abakan (Khakassia). Infective species of Krasnoyarsk region were identified, presented by the staff of the Department of Biology, Chemistry and Ecology in the publication of the “Black Book of Siberian Flora”. Systematic research, which began with the work on the Flora of Siberia project, continue with a description of new species. We participated in the study of natural protected areas of the region and rare species in the Red Book species, in the preparation and reprint of the Red Book of Krasnoyarsk region (2012).
Reference intervals of essential and toxic elements concentrations in mane hair and blood serum of Arabian purebred horses
Authors: Kalashnikov V V , Zaitsev A M , Atroshchenko M M , Miroshnikov S A , Zavyalov O A , Frolov A N , Kurilkina M Ya 
Published: March 2021

Abstract
The article presents the results of studies on the establishment of reference intervals of concentrations of the main essential and toxic elements in mane hair and blood serum of Arabian purebred horse stallions, calculated by Atomic emission spectroscopy (AES) and Inductively coupled plasma mass spectrometry (ICP-MS) methods. For mane hair, these values are Ca 81,28-1875; K 57,2-2134; Mg 93,92-1154; Na 16,76-542; P 47,1-827,3; Co 0,008-0,201; Cr 0,022-1,35; Cu 0,936-9,73; Fe 18,55-363; I 0,006-0,367; Mn 0,407-8,34; Se 0,039-0,625; Zn 14,49-201; B 0,311-25,66; Li 0,027-0,82; Ni 0,05-0,712; Si 0,809-34; V 0,018-0,594; Al 5,98-208; As 0,009-0,116; Cd 0,001-0,021; Hg 0,002-0,008; Pb 0,02-0,571; Sn 0,001-0,097; Sr 0,311-5,94. For blood serum, these values are Ca 106,2-161,3; K 89,19-187,1; Mg 18,16-27,05; P 78,32-153,1; Co 0,0003-0,0015; Cr 0,0003-0,0101; Cu 0,7-1,46; Fe 1,35-3,51; Mn 0,0005-0,0043; I 0,007-0,019; Se 0,118-0,208; Zn 0,502-0,952; Al 0,01-0,028; As 0,001-0,004; Cd 0-0,0001; Hg 0,0002-0,0009; Pb 0,0001-0,0026; Sn 0-0,0001; Sr 0,14-0,367. It was found that the chemical elements concentration in hair is significantly higher (1.4-2707 times) compared to blood serum; it makes this biosubstrate more informative for the elemental status evaluation. The results of the correlation analysis indicate the absence of a reliable correlation between the content of the studied elements in hair and blood serum.
Comparison of blood biochemical parameters of stallions of different age groups
Authors: Atroshchenko M M , Shitikova A M , Engalycheva M G , Borodkina E Yu 
Published: March 2021

AbstractThe analysis of biochemical parameters of blood serum of stallions of different age groups (n = 86) is carried out. It was found that with age there is an increase in the concentration of total protein, fibrinogen, direct and indirect bilirubin, while the group of young stallions aged 3-5 years is characterized by a higher value of alkaline phosphatase activity compared to the group of 6-10 years (p = 0.002) and a lower value calcium concentration compared with the group of stallions aged 16-22 years (p = 0.012).
State of the Manchurian pheasant Phasianus colchicus pallasi population in Russia, its meat productivity and safety
Authors: Sandakova S L , Motina N V , Kozak S S , Gromov I Yu , Toushkin A A , Matveeva O A , Krasavina A A 
Published: March 2021

Abstract
The article states that the Manchu pheasant Phasianus colchicus pallasi is a Far Eastern subspecies of the common pheasant, a common inhabitant of meadows and fields in the coastal region of Russia and in the Amur River valley. Our studies of the Amur pheasant population showed that it has a high abundance of P. c. pallasi in the wild in the Russian Federation. With regard to this type of bird, registration work is regularly carried out. Based on the data of nature conservation inspectors, inspectors of legal hunting, hunting for wild birds is carried out. The problem for modern science is the preservation and development of the gene pool of this species. Further, work to preserve the pheasant in nature and for home and farm poultry farming. Farmed pheasants are mainly a Caucasian subspecies of the common pheasant. Therefore, the main problem is closely related breeding and, as a consequence, the degeneration of birds on farms. They quickly become incapable of reproduction and give rapidly dying offspring. We have considered the Far Eastern population of the common pheasant. As a reservoir of an additional gene pool for enrichment and creation of a stable population of birds for farming and obtaining a primary scientific base for obtaining hybrid breeds. We have studied its number, population dynamics over the years over the past 10 years and food security. Since this estimate is necessary to account for the reserve population of pheasant breeding. Numerous studies of the chemical composition of pheasant meat show that it is richer in protein and lower in fat than broiler meat, the recognized leader in dietary meat. Microbiological studies for food safety have shown its high quality and suitability for nutrition.
Pets in an urban environment as an ecosystem: a systems approach
Authors: Rybakova G R , Doiko I V , Grebennikova A E , Zrazhevskaya I V , Ryzhuk V A 
Published: March 2021

Abstract
In the ecosystem “person - pet - urban environment” one of the main unresolved issues not only in Krasnoyarsk, but also on a national scale, is the task of filling the space of a comfortable urban environment with zones of free walking for dogs. The involvement of a large number of subjects of interaction in this problem requires the adoption of consolidated decisions that take into account the interests of all participants. At the same time, the problem of ensuring the quality of life of animals should not be left aside. To understand the full depth and multidimensional complexity of the interaction of subjects in this field, in the further development of the study, it is assumed to use the method of analysis of the system-parametric version of the system approach. The purpose of the article is to substantiate the subsequent application of this method based on the analysis of the three levels of causality, indicated by the author of the method V.N. Sagatovsky as fundamental. A brief review showed the presence of all three conditions for this: the need to move to more active actions in solving the problem, the multidimensional complexity of the issue under consideration and its interdisciplinary nature.