Investigation of the mechanical properties and corrosion behaviour of hybrid L 80 Type 1 and duplex steel joints produced by magnetically impelled arc butt welding

In the field of deep geothermal energy, the mono-tube design will be increasingly used in the future, as significant cost savings can be expected in the production of boreholes up to depths of 6000 m. The previously used bolting of the pipe lengths by means of sleeves contributes significantly to the construction costs. In addition, there is an increased risk of failure for the sleeve bolting, especially if different materials have to be used in different layers for the purpose of increasing the corrosion resistance. Magnetically Impelled Arc Butt Welding (MIAB) was used for direct welding of pipe segments with complete elimination of socket bolting. In the process, the casing material (L80 Type 1), which is a cost-effective standard material, and a corrosion-resistant duplex steel (1.4462) were hybrid welded. The results show excellent properties both in terms of mechanical properties and corrosion resistance. It is shown that the advantages of the MIAB process in joining these different materials can successfully overcome the metallurgical challenges. This new approach for the production of borehole liners can contribute significantly to cost reduction in the construction of geothermal boreholes

Vending technologies in improving food services

To date, vending machines are widespread. If abroad vending machines are used everywhere to sell a wide variety of goods and even services, then in our country, so far, as a rule, only classic coffee machines and spring machines for issuing snacks attract the attention of buyers. Only in recent years, there has been a trend towards the emergence of atypical vending machines in Russia, such as vending machines for the sale of french fries, coffee shops, dumplings, pizza makers, etc. The article presents the developed vending machine for the preparation and sale of potato balls, the principle of operation of innovative vending, the recipe for potato balls with fillers

THE REVIVAL RELEVANCE OF THE COMPLEX “READY FOR LABOR AND DEFENSE” ON THE EXAMPLE OF THE TECHNICAL UNIVERSITY STUDENTS

Согласно плану мероприятий, по этапному внедрению Всероссийского физкультурно-спортивного комплекса «Готов к труду и обороне» (ВСФК ГТО), утвержденным распоряжением Правительства РФ от тридцатого июня 2014 года, комплекс ГТО с 2016 года должен быть внедрен среди обучающихся всех образовательных организаций страны. Анализ сложившейся ситуации показывает, что проблема заключается в недостатке научно обоснованных сведений о содержании комплекса для сдачи студентам нормативов «Готов к труду и обороне» (ГТО).Целью исследования является провидения эксперимента для проверки знаний студентов содержания комплекса ГТО в целях подготовки к сдаче норм ГТО на основе актуализации педагогического и оздоровительного потенциала высшего учебного заведения (ВУЗа). В данной статье рассматриваются результаты обработки анкеты.Основной целью исследования являлось изучение мнения о степени подготовки студентов Волгоградского государственного технического университета (ВолгГТУ) к сдаче комплекса «Готов к труду и обороне».According to the activity plan and to the phased introduction of the all-Russian sports complex “Ready for labor and defense” (ARSC RLD), approved by the decree of the Russian Federation Government, dated the thirtieth of June 2014, the complex RLD in 2016 should be implemented among the students of all educational institutions of the country. The analysis of the situation shows that the problem is in the lack of scientifically based information about the content and the structure of the physical training of the students for passing the standards “Ready for labor and defense” (RLD).The aim of the research is the experiment to test students knowledge of the content of the RLD order to prepare to the passing of the standards RLD, on the basis of the actualization of the pedagogical and health potential of the higher educational institutions (HEI). This article describes the results of the examination of the questionnaires.The main purpose of this research is to scan opinions about the orientation degree of the students of Volgograd State Technical University (VSTU) in the standards of the complex “Ready for labor and defense”

Disentangling methane and carbon dioxide sources and transport across the Russian Arctic from aircraft measurements

A more accurate characterization of the sources and sinks of methane (CH4) and carbon dioxide (CO2) in the vulnerable Arctic environment is required to better predict climate change. A large-scale aircraft campaign took place in September 2020 focusing on the Siberian Arctic coast. CH4 and CO2 were measured in situ during the campaign and form the core of this study. Measured ozone (O3) and carbon monoxide (CO) are used here as tracers. Median CH4 mixing ratios are fairly higher than the monthly mean hemispheric reference (Mauna Loa, Hawaii, US) with 1890&ndash;1969 ppb vs 1887 ppb respectively, while CO2 mixing ratios from all flights are lower (408.09&ndash;411.50 ppm vs 411.52 ppm). We also report on three case studies. Our analysis suggests that during the campaign the European part of Russia&rsquo;s Arctic and Western Siberia were subject to long-range transport of polluted air masses, while the East was mainly under the influence of local emissions of greenhouse gases. The relative contributions of the main anthropogenic and natural sources of CH4 are simulated using the Lagrangian model FLEXPART in order to identify dominant sources in the boundary layer and in the free troposphere. In western terrestrial flights, air masses composition is influenced by emissions from wetlands and anthropogenic activities (waste management, fossil fuel industry and to a lesser extent the agricultural sector), while in the East, emissions are dominated by freshwaters, wetlands, and the oceans, with a likely contribution from anthropogenic sources related to fossil fuels. Our results highlight the importance of the contributions from freshwater and oceans emissions. Considering the large uncertainties associated to them, our study suggests that the emissions from these aquatic sources should receive more attention in Siberia.</p

Influence of Structural Heterogeneity of High-Strength OCTG Tubes on Sulfide Corrosion Cracking Resistance

High-strength oil country tubular goods (OCTG) like C110, according to standard API 5CT (yield strength at least 758 MPa), are subject to requirements in terms of mechanical and corrosion properties. In this work, we studied the influence of seamless tubes microstructure with a 177.8 mm diameter and 10.36 mm wall thickness of class С110 high-strength steel to sulfide stress corrosion cracking (SSC) and sulfide stress corrosion cracking with low strain rates (SSRT). Tubes were obtained from continuous billets by screw piercing with preliminary quenching and tempering. It was established that cracking during the tests always begins from the inner surface of the tube. Rough segregation bands were found on the inner tube surface, which occupies about a third of the thickness. It is shown that the SSRT assessment technique allows to estimate the threshold value of the resistance

Prospects for the development of green and energy efficient technologies in construction

Energy saving technologies have recently been considered at the level of state and international policy. Various opinions on the causes of appreciation of energy resources, on depletion of natural resources, changes in climate and many other problems are coming from the expert community. Increasing tariffs and prices for the consumed energy and heat citizens can feel on themselves. The diverse opinions of representatives of all government levels, departments and organizations converge in one thing: it is necessary to reduce the energy consumption, develop energy efficiency and energy saving measures in the country which will contribute to this. The relevance of this study is based on the lack of a mechanism to meet the social, economic, aesthetic and ecological needs of a person. Nevertheless, the problems of ecology and environmental protection are still acute and urgent. Levels of water and air pollution remain high due to outdated equipment and insufficient integration of modern technologies and waste treatment facilities. Motor transport increased the pollution level of the urban airspaces. Taking into consideration the significant growth of passenger transport, the reduction of trucks in the general traffic flows does not reduce the overall air and noise pollution in the roadside territories

Prospects for the development of green and energy efficient technologies in construction

Energy saving technologies have recently been considered at the level of state and international policy. Various opinions on the causes of appreciation of energy resources, on depletion of natural resources, changes in climate and many other problems are coming from the expert community. Increasing tariffs and prices for the consumed energy and heat citizens can feel on themselves. The diverse opinions of representatives of all government levels, departments and organizations converge in one thing: it is necessary to reduce the energy consumption, develop energy efficiency and energy saving measures in the country which will contribute to this. The relevance of this study is based on the lack of a mechanism to meet the social, economic, aesthetic and ecological needs of a person. Nevertheless, the problems of ecology and environmental protection are still acute and urgent. Levels of water and air pollution remain high due to outdated equipment and insufficient integration of modern technologies and waste treatment facilities. Motor transport increased the pollution level of the urban airspaces. Taking into consideration the significant growth of passenger transport, the reduction of trucks in the general traffic flows does not reduce the overall air and noise pollution in the roadside territories

Threat level in the workplace

The paper discusses the calculation of the indicator presented in the form of the treat level, which makes it possible to predict and characterize the emerging risk situations in the workplace. The calculation of the threat level is intended for use in assessing the organization of safe working conditions in the workplace, taking into account the labor process. The presented calculation of the threat level is universal, regardless of the type of work, the number of workers and the duration of work. The use of this indicator at enterprises will improve organizational measures to ensure safe working conditions, which will contribute to improving the quality of decisions made and prompt response to ongoing processes