Microstructure and Mechanical Properties of Tin-Based Alloys for Nb3Sn Superconductors DOI: 10.22184/2227-572X.2020.10.5.378.385
The compositions of tin alloys for use in technical Nb3Sn superconductors have been determined. The structure and mechanical properties of tin alloys of three compositions were investigated: Sn – 0.8 wt.% Cu; Sn – 0.8 wt.% Cu – 0.5 wt.% Zn; Sn – 0.5 wt.% Al. It is shown that the tensile strength and microhardness of the alloys are higher compared to pure tin. Investigations of the microstructure of tin alloys in the composition of composite subelements have been carried out. The Sn alloy selected on the basis of the analysis of the results of this work is 0.8 wt.%Cu was successfully used in the fabrication of an Nb3Sn superconductor under the conditions of the AO ChMP using the internal tin source method. As a result, a superconductor with a diameter of 1 mm was obtained, consisting of 120 subelements.
Zirconology and Age of the Fe-Ti Eclogites from Belomorian Province DOI: 10.22184/2227-572X.2020.10.5.386.402
Fe-Ti eclogites near Ptarmigan mount was studied. The Geochemistry of the main and rare elements shows their similarity to the Salma eclogites of Belomorian province as a whole and have geochemical features with MOR tholeites. In this regard, the mechanism of ocean crust subduction and ultrahigh-pressure metamorphism in the rocks formation was early proposed. To determine of the age, the Th-U-Pb isotope system in zircons was studied using LA-ICP-MS. To plan the dating and interpret the obtained ages, zircons were studied using modern methods: optical and electron microscopy, microprobe analysis, 3D laser microscopy, black-and-white (SEM-CL) and color (EPMA-CL (tc)) cathodoluminescence, and Raman spectroscopy. Zircons have a zonal structure – cores with high and shells with very low U and Th contents. The cores of Archean age retain oscillatory magmatic zoning and lack microscopic signs of metamictization. In the Proterozoic shells, cathodoluminescent heterogeneity is observed, which is caused by crystal – chemical factors during a single event of crystallization and mechanical stresses.
Application of Polydicyclopentadiene in the Manufacture of Composites with Enhanced Mechanical Properties DOI: 10.22184/2227-572X.2020.10.5.404.408
An overview of the methods for the production of polydicyclopentadiene suitable for use as a matrix material for reinforced composites is presented. A comparison of the mechanical properties of the finished polymer is carried out, and the optimal manufacturing parameters are determined. The analysis of world producers of polydicyclopentadiene is presented. Potential fields of application of composites based on polycyclopentadiene are determined.
Flow injection Amperometric Determination of cortisol and Melatonin on at Electrode Modified by Gold Particles DOI: 10.22184/2227-572X.2020.10.5.410.416
Cortisol and melatonin are two hormones that directly affect wake and sleep. It is necessary to determine the content of cortisol and melatonin in body fluids to control disturbances in the sleep / wake cycles that can contribute to the development of cancerous tumors. It has been determined that gold particles deposited on a screen-printed electrode exhibit catalytic activity during the electrooxidation of cortisol and melatonin, and the deposited particles of palladium, copper and cobalt exhibit catalytic activity only during the electrooxidation of melatonin. Dual screen-printed electrodes modified by gold particles were used for the simultaneous two-component analysis, which allows simultaneously determine two substances at two different potentials. The linear bilogarithmic dependence of the analytical signal on the analyte concentration is observed in the ranges from 1 • 10–11 to 1 • 10–5 M for cortisol and from 5 • 10–10 to 5 • 10–3 M for melatonin. The use of a dual screen-printed electrode modified by gold particles for the amperometric determination of cortisol and melatonin in a flow injection system provides a high throughput up to 360 samples / h.
Analysis of the Boundary Layer of the Visual Image of an Object to Determine Its Characteristics DOI: 10.22184/2227-572X.2020.10.5.418.422
The rapid development of optoelectronic devices, photo and video detectors, the expansion of the bandwidth and speed of the data transmission channel make the video control and measurement systems one of the most promising in the near future. This study is devoted to the analysis of the components that affect the fuzziness of the object image obtained in the image. As the main components of the blur function, values are proposed that take into account the parameters of the environment between the object under study and the camera, the parameters of the object and detector movement, the internal parameters of the camera, and the color components of the object image and the background. At the same time, the blurring of the boundaries of the object, despite the poor quality of the images obtained, also carries information about the direction of movement, its speed, the state of the environment, etc., that can be used to determine the parameters of the state and movement of control objects.
The Russian Institute of Radiology and Agroecology Is 50 Years Old: Forward to New Goals and Achievements! DOI: 10.22184/2227-572X.2020.10.5.354.370
In 2020, Russian Institute of Radiology and Agroecology (formerly the All-Union Scientific Research Institute of Agricultural Radiology) will celebrate its 50th anniversary. Founded during the Cold War, the institute was primarily intended to solve the problems of agricultural sustainability in the context of a possible nuclear conflict. In parallel, research was carried out on «peaceful» topics, including the coordination of the work of 50 institutes-co-executors of the system of the Ministry of Agriculture of the USSR, the ministries of agriculture of the union republics and the All-Union Academy of Agricultural Science on the application of the achievements of atomic science and technology in agriculture. The Institute“s developments have found application in improving the military doctrine of the USSR, and the employees were awarded USSR State Prizes. Director of RIRAE, Corresponding Member of the Russian Academy of Sciences, laureate of the State Prize of the Russian Federation Natalya Ivanovna Sanzharova and heads of departments of the institute spoke about the history and achievements, areas of work and development prospects.
Bochvar Inorganic Materials Research Institute: Our Work Focuses on Innovative Materials and Technologies for Defense and Nuclear Energy DOI: 10.22184/2227-572X.2020.10.5.372.377
JSC VNIINM – Bochvar Inorganic Materials Research Institute (formerly known as Research Institute #9) was founded as a scientific and technological center to solve the problems of nuclear energy. From the very foundation, scientific research had been carried out to study the physical nad chemical properties of the superheavy isotope of hydrogen – tritium. The team of the research department for the development of equipment and technologies for special non-nuclear materials and isotopic products of this institute co-authored all Soviet, and later Russian tritium technologies – from the production of tritium by the reactor (from lithium 6 isotope), purification and concentration of this most important component of thermonuclear fusion before the decontamination of materials and units of technological installations contaminated with this hydrogen isotope (detritization). And today in the work of this department, tritium is one of the most important elements for the development of modern high-tech solutions for various fields of science and industry. Read about the tasks facing the youngest team at VNIINM JSC, about the latest developments and equipment, as well as about development prospects in our report from its laboratories and production sites.
Stars of Analytical Instrumentation. Erhard Mettler DOI: 10.22184/2227-572X.2020.10.5.424.425