Influence of plasma torch design on cutting quality during precision air-plasma cutting of metal

Optical interferometry and metallographic analysis were used to study the structure of cutting seams obtained after 09G2S steel cutting by a PMVR-5 plasma torch. These plasma torches have many design features in the gas-dynamic stabilization system of the plasma arc. The application of a new plasma torch can obtain higher quality and lower energy costs of cutting medium-thick 09G2S steel. Metallographic analysis has shown that the qualitative composition of the cut surface structure is almost the same, so priority criteria for comparative quality analysis are surface microgeometry parameters. The parameter evaluation shows high quality of cutting almost along the entire length of a cut, since the technological feature influence of plasma arc cut into the metal affects less than 0.3 mm from the sheet edge. The use of additional methods of gas-dynamic stabilization in PMVR-5.2 plasma torch (feed symmetry with a double swirl system of plasma-forming gas) makes it possible to achieve additional advantages in terms of surface quality compared to PMVR-5.1. A number of features that affects cut quality when cutting metals of different thicknesses for welding depends on the inclination angle of a plasma torch during cutting. Estimates of the surface layer hardness indicate minimal deviations from the requirements of GAZPROM Standard 2-2.4-083 (instructions on welding technologies in the construction and repair of field and main gas pipelines), which allows further use of cutting seams obtained by studied plasma torches for welding without removing thermal influence zones. Thus, the application of new plasma torches for precision-finishing plasma cutting of metals, including production of welded joints, is possible. © 2020, Allerton Press, Inc

The Porous Structure of Copper-cadmium Oxide System Prepared by AC Electrochemical Synthesis

The porous structure of nanoparticles of copper-cadmium oxide system prepared by AC electrochemical synthesis in sodium chloride with a concentration of 3, 15, 25 wt. % has been studied. The obtained data indicate that at a higher current density and sodium chloride concentration of 3% wt. in the electrochemical oxidation of cadmium and copper products are formed with the structure of mesopores and channels. In this case, the specific surface area has the greatest value (19.4 m{2}/g) and a maximum pore volume (0.0778 cm{3}/g). Thus, the obtained data allow predicting the operating parameters of the electrolysis to obtain a copper - cadmium oxide system of a predetermined porous structure

Clinical manifestations and outcomes of tuberculosis in children in the Irkutsk region

100 children were observed. Tuberculosis of inrathoracic lymph nodes was found in 79 (79,0 %) patients, complicated tuberculosis - in 29 (36,7 %) of 79 patients. The phase of reverse development of tuberculosis was detected in 47,0 % of children with TB. Due to the slow dynamics of the disease, the duration of chemotherapy in 75,0 % of children was 240 days. In the mode of treatment, drug resistance of a patient in lesion of tuberculosis infection is taken into account. As a result of treatment, resorption of infiltration in the lungs was observed in 15,0 %, fibrosis - in 26,0 %, formation of small calcifications - in 39,0 %, formation of multiple large calcifications - in 20,0 % of children. The cause of the formation of calcifications is the late detection of tuberculosis. In children with the formation of calcifications throughout the course of treatment the number of leukocytes decreased, the downward trend in the absolute number of lymphocytes to the 4th month of treatment was traced, the content of leukocytes increased to the end of primary treatment. In children without formation of calcifications the reduction of leukocytes and lymphocytes was not identified during the treatment. The decrease in the content of leukocytes and lymphocytes may explain long-term persistence of endogenous intoxication

Medical and social characteristics of children with tuberculosis in conditions of social insufficiency in the Irkutsk region

Background. In cases of tuberculosis in children, contacts with patients with drug-resistant forms are often detected. Treatment and prevention of the disease is based on these data and adherence to treatment. Aims. To analyze the social status of the family of children with tuberculosis, clinical forms and drug resistance of MBT in patients who are sources of infection in the outbreak for adequate planning of preventive treatment of contact and treatment of children with tuberculosis. Materials and methods. The study involved 150 children with tuberculosis treated in a hospital in 2009-2012 and 142 children - in 2015-2017. We studied social factors and drug resistance of Mycobacterium tuberculosis in adult patients - sources to child transmission. Drug resistance of MBT cultures was determined by Löwenstein - Jensen medium and automated system BACTEC MGIT 960. Results. 50.0 % of children with tuberculosis are patients of preschool age, 33.0 % of children aged under 3 years. From 2009-2012 to 2015-2017 the proportion of socially disadvantaged families fell from 68.0 % to 45.1 %. At the same time the proportion of children with tuberculosis, contracted from a known contact decreased from 70.0 % to 57.0 %. Often children get infected from mother or from several close relatives (mother, father, grandfather, grandmother), TB patients source of infection of children are often diagnosed with infiltrative (21.9-38.3 %) and fibro-cavernous tuberculosis (17.0-21.0 %). To 2015-2017 multi-drug resistance in the nidi was recorded at 52.2 %. The development of tuberculosis in children was facilitated by the defects of preventative measures: absence of BCG vaccination (from 9.0 to 14.0 % of children), the absence of preventive treatment (55.3-67.5 %)

Studying the structure and adhesion strength of thermal barrier coating

The structure and adhesive strength of thermal barrier coatings produced by successive deposition of layers is studied. The coating is applied in three layers: I) a diffusion aluminosilicide coating that provides protection against high temperature oxidation and corrosion, with a thickness of 50μm; ii) a metal sublayer providing a smooth transition from a metal coating to a ceramic one, with a thickness of 100 to 120μm; iii) a ceramic layer decreasing the temperature of the blades during operation, with a thickness of 70 to 100μm. The total coating thickness ranges from 0.17 to 0.27mm. It is shown that the second and third layers deposited by plasma spraying are quite dense, the porosity being less than 5 vol%. During tensile tests carried out on an Instron testing machine, the failure of glued samples was always detected in the adhesive joint. The adhesive strength of the applied epoxy-based adhesive was 12MPa; it can be stated that the adhesive strength of the coating is higher than 12MPa. © 2019 Author(s)

Feminitiviti: Nominative and Derivational Aspects

В статье рассматривается роль словообразования в изучении языковой картины мира применительно к сетевым неофеминитивам.The scientific novelty of the study is seen in the proof of the position on the role of word formation in the study of the linguistic picture of the world in relation to the group of neofeminitives

Institutional aspects of economic systems management

© 2016, ASERS Publishing House. All rights reserved.The relevance of the study is conditioned by the development of institutional innovations of economic systems’ management. Selecting of alternative institutional innovations is associated with the probability of suboptimal institutions’ introduction that blocks more effective options for economic development. The purpose of the paper is to identify the institutional aspects of management of economic systems. The leading approach is the institutional one that allows considering of the institutional aspects of economic systems’ management as a source of their development and preconditions of activities’ organization focused on costs’ reducing connected with excessive government regulation of the economy, and the formation of effective tools for interaction of federal executive bodies in the implementation of functions. The paper presents the essential characteristics of the institutional order, the institutional environment and institutional structure and establishes their relationship; presents the institutions’ Russian experience of state orders’ placement and the organization of the institutional environment; reveals the significances of communitarian values in the development of economic systems; offers the development of institutional structure of the service sector; clarifies the characteristics of the institutional aspects of economic systems’ management (multi-levelness, duality, fragmentariness). The paper submissions institutions are often interdependent, but the regularities of creation and transformation of institutions for rational (targeted) and evolutional changes and time intervals, associated with them are different

Institutional aspects of economic systems management

© 2016, ASERS Publishing House. All rights reserved.The relevance of the study is conditioned by the development of institutional innovations of economic systems’ management. Selecting of alternative institutional innovations is associated with the probability of suboptimal institutions’ introduction that blocks more effective options for economic development. The purpose of the paper is to identify the institutional aspects of management of economic systems. The leading approach is the institutional one that allows considering of the institutional aspects of economic systems’ management as a source of their development and preconditions of activities’ organization focused on costs’ reducing connected with excessive government regulation of the economy, and the formation of effective tools for interaction of federal executive bodies in the implementation of functions. The paper presents the essential characteristics of the institutional order, the institutional environment and institutional structure and establishes their relationship; presents the institutions’ Russian experience of state orders’ placement and the organization of the institutional environment; reveals the significances of communitarian values in the development of economic systems; offers the development of institutional structure of the service sector; clarifies the characteristics of the institutional aspects of economic systems’ management (multi-levelness, duality, fragmentariness). The paper submissions institutions are often interdependent, but the regularities of creation and transformation of institutions for rational (targeted) and evolutional changes and time intervals, associated with them are different

Influence of Plasma Torch Design on Cutting Quality during Precision Air-Plasma Cutting of Metal

Abstract: Optical interferometry and metallographic analysis were used to study the structure of cutting seams obtained after 09G2S steel cutting by a PMVR-5 plasma torch. These plasma torches have many design features in the gas-dynamic stabilization system of the plasma arc. The application of a new plasma torch can obtain higher quality and lower energy costs of cutting medium-thick 09G2S steel. Metallographic analysis has shown that the qualitative composition of the cut surface structure is almost the same, so priority criteria for comparative quality analysis are surface microgeometry parameters. The parameter evaluation shows high quality of cutting almost along the entire length of a cut, since the technological feature influence of plasma arc cut into the metal affects less than 0.3 mm from the sheet edge. The use of additional methods of gas-dynamic stabilization in PMVR-5.2 plasma torch (feed symmetry with a double swirl system of plasma-forming gas) makes it possible to achieve additional advantages in terms of surface quality compared to PMVR-5.1. A number of features that affects cut quality when cutting metals of different thicknesses for welding depends on the inclination angle of a plasma torch during cutting. Estimates of the surface layer hardness indicate minimal deviations from the requirements of GAZPROM Standard 2-2.4-083 (instructions on welding technologies in the construction and repair of field and main gas pipelines), which allows further use of cutting seams obtained by studied plasma torches for welding without removing thermal influence zones. Thus, the application of new plasma torches for precision-finishing plasma cutting of metals, including production of welded joints, is possible. © 2020, Allerton Press, Inc