Search for long-lived states in antiprotonic lithium

The spectrum of the (L_i^3 + p-bar + 2e) four-body system was calculated in an adiabatic approach. The two-electron energies were approximated by a sum of two single-electron effective charge two-center energies as suggested in [6]. While the structure of the spectrum does not exclude the existence of long-lived states, their experimental observability is still to be clarified

Constrains on non-Newtonian gravity from the experiment on neutron quantum states in the Earth's gravitational field

An upper limit to non-Newtonian attracive forces is obtained from the measurement of quantum states of neutrons in the Earth's gravitational field. This limit improves the existing constrains in the nanometer range

Increasing the resistance of a NiCrBSi coating to heat wear by means of combined laser heat treatment

Testing of NiCrBSi coatings formed by gas-powder laser cladding and combined laser heat treatment, including laser cladding and high-temperature annealing, were conducted under conditions of sliding friction on the Kh12M steel according to the pin-on-disk scheme. The combined processing resulting in the formation of large carbides and chromium borides in the coatings is shown to increase their wear resistance by a factor of 1.8 at sliding velocities of 6.1 and 9.3 m/s, when there is significant frictional heating of the friction surfaces. © 2018 Author(s)

Wear-resistant nickel-based laser clad coatings for high-temperature applications

The effect of high-temperature processing on laser clad Ni-based coatings is studied. Annealing at 1025°C forms thermally stable framework structures with large chromium carbides and borides. As a result, improved hardness and wear resistance of the coating are maintained when heated to 1000°C. Stabilizing annealing also increases the frictional thermal resistance of the NiCrBSi coating. Under high-speed (3.1– 9.3 m/s) sliding friction, when the surface layer temperature reaches about 500 –1000°С and higher, the wear resistance of the coating increases by 1.7 – 3.0 times. The proposed approach to the formation of heat-resistant coatings is promising, in particular, for a hot deformation tool and other components of metallurgical equipment operating under high thermal and mechanical loads. Such products include crystallizer walls of continuous casting machines. For the walls, the development of laser cladding technology for wear-resistant composite coatings on copper alloys is relevant as an alternative to thermal spraying. The cladding of composite NiBSi-WC coatings of 0.6 and 1.6 mm thickness on a Cu-Cr-Zr bronze substrate heated to 200 – 250°C with a diode laser is considered. The presence of boron causes the formation of the W(C, B) carboboride phase, whose hardness is higher than that of WC in the initial powder. Depending on the thickness of coatings and, accordingly, on the duration of heating and the subsequent cooling, the process of secondary carboborides precipitation from the solid solution can be suppressed (in the “thin” coating) or activated (in the “thick” coating). This leads to a higher wear resistance under friction sliding 1.6 mm thickness coating. © 2019, Institute for Metals Superplasticity Problems of Russian Academy of Sciences. All rights reserved.Institute of Education Sciences, IES: АААА-А18-118020790147-4Russian Science Foundation, RSF: 19-79-00031АААА-А18-118020190116-6The work was supported by the state orders of IMP UB RAS on the subjects “Laser” and “Structure” №АААА-А18-118020190116-6 and IES №АААА-А18-118020790147-4. The study of the evolution of the structure of NiCrBSi coatings during heating was carried out with financial support from the Russian Science Foundation, grant № 19-79-00031. The structural studies were done on the equipment installed at the Plastometriya Collective Use Center of IES UB RAS

Обсуждение в ЦДУ РАН проблем развития отечественной статистики и путей их решения (обзор научных докладов и выступлений на секции статистики в 2018-2019 годах)

This scientific and information review provides insight into the contents and nature of some questions and matters of national statistics as noted in the reports of statisticians - academics and practitioners at the meeting of Statistics Section of the Central House of Scientists of the Russian Academy of Sciences (CDU RAS) in 2018-2019. The Section covered a wide range of topics which could be grouped (although this grouping is somewhat relative) into three focus areas in modern Russian statistics discussed in the 2018-2019 season at the Central House of Scientists: I. Theoretical and practical aspects associated with conducting statistical observations, II. Development issues of macroeconomic statistics and III. Application of international statistical standards to Russian conditions.In these respective areas, debates focused on the results of the 2016 Russian Census of agriculture, optimization of the organizational structure of the 2020 Russian Population Census based on the results of the 2018 Pilot Population Census, fundamental principles of consumer price monitoring and calculating the consumer price index in today’s Russian statistics. Topics of methodological support of statistics on non-financial economic assets, improving the quality of GDP estimates based on the development of annual supply and use tables, the subject matter of innovation statistics triggered heated discussions amongst the practitioners and theoreticians who participated actively in the meetings. Finally, the Section reviewed matters of adopting international statistical standards to suit Russian conditions, in particular, the practical implementation of the Resolution concerning statistics of work, employment, and labor underutilization and Russian issues of international banking statistics.В данной статье, подготовленной ее авторами в формате научно-информационного обзора, раскрываются содержание и характер отдельных проблем развития отечественной статистики, которые нашли свое отражение в докладах статистиков - ученых и практиков, выступавших на заседаниях секции статистики в Центральном Доме ученых Российской академии наук (ЦДУ РАН) в течение 2018-2019 гг. При всем разнообразии рассмотренных на секции статистики ЦДУ РАН вопросов можно было бы выделить (несмотря на определенную условность конкретно такой группировки) три следующих актуальных направления в современной отечественной статистике, дискуссии по которым проводились в очередном (2018-2019) сезоне работы Дома ученых: I. Теоретические и практические вопросы проведения статистических наблюдений; II. Вопросы развития макроэкономической статистики; III. Применение международных статистических стандартов в российских условиях.По данным направлениям в дискуссиях предметом обсуждения стали итоги Всероссийской сельскохозяйственной переписи 2016 г., вопросы оптимизации организационной схемы проведения Всероссийской переписи населения 2020 г. по итогам Пробной переписи населения 2018 г., основные принципы организации наблюдения за потребительскими ценами и расчета индекса потребительских цен в современной российской статистике. Широкий резонанс среди активно участвовавших в заседаниях секции специалистов - теоретиков и практиков вызвали обсуждения вопросов методологического обеспечения статистики нефинансовых экономических активов, повышения качества оценок ВВП на основе разработок ежегодных таблиц ресурсов и использования, проблематики статистики инноваций. И наконец, на секции дискутировались вопросы адаптации к российским условиям международных статистических стандартов, в частности результаты внедрения в статистическую практику Резолюции о статистике трудовой деятельности, занятости и недоиспользования рабочей силы и проблематика международной банковской статистики

Сложности применения классификации TI-RADS при ультразвуковом исследовании щитовидной железы

The article presents the experience of using the TIRADS classification (2020) in multiparametric ultrasound examination of the thyroid gland of 60 patients with subsequent morphological verification by fine needle aspiration biopsy. The article support the problems and difficulties that may arise in the ultrasound diagnostics doctor during the stratification of nodules and possible ways to solve this problems.В статье приводится опыт применения классификации TI-RADS (2020) при проведении мультипараметрического ультразвукового исследования щитовидной железы 60 пациентов с последующей морфологической верификацией путем тонкоигольной аспирационной биопсии. Освещены проблемы и трудности, которые могут возникнуть у врача ультразвуковой диагностики при стратификации узлового образования при использовании данной классификации и возможные пути их решения

Cavitation Resistance of WC-10Co4Cr and WC-20CrC-7Ni HVAF Coatings

Machines operating in aqueous environments may be subjected to cavitation damage during operation. This study aims to evaluate the cavitation resistance of WC-10Co4Cr and WC-20CrC-7Ni coatings under cavitation erosion conditions with additional electrochemical effects. The coatings were deposited on AISI 1040 steel substrates using a high velocity air fuel thermal spray process. The microstructure of the coatings was observed by a scanning electron microscope, while their phase composition was analyzed using an energy-dispersive microanalysis system. In addition, the microhardness of the coatings and substrate was measured, and the surface topography of the eroded surface layers was observed using a 3D optical profilometer. The results revealed that the cavitation resistance of the WC-20CrC-7Ni coatings was better than that of the WC-10Co4Cr coatings. The observation of the structure and surface topography made it possible to identity the reasons for the differences between the cavitation resistance of both coatings: The WC-20CrC-7Ni coatings had a finer grain structure, lower pore density, and lower as-sprayed surface roughness. These differences, along with the presence of a high Cr and Ni content in the feedstock powder, that increased the coating corrosion resistance, contributed to improving the cavitation resistance and reducing the material loss of the WC-20CrC-7Ni coatings. © 2021, ASM International.The work was completed within state assignments from FASO Russia for IMP UB RAS on the subjects No. AAAA-A18-118020190116-6, № AAAA-A19-119070490049-8 and for IES UB RAS on the subject No. AAAA-A18-118020790147-4. The present study was supported by project № IRA-SME-66316 cladHEA+ (M-ERA.NET Call 2019-II) and M-ERA.Net ETAG18012 DuraCer. The experimental research was carried out using the equipment of the Plastometriya Collective Use Center of IES UB RAS

Behavior of a welded-deposited stainless steel tested at different cavitation test conditions

Two different ultrasonic vibratory-cavitation test conditions have been applied to a welded-deposited austenitic stainless steel AISI 321 to evaluate the resistance of deposited layer to cavitation erosion-corrosion. The cavitation test was conducted utilizing two test fluids; water and 3.5% NaCl solution. In addition, a certain voltage difference has been applied between the test specimen and water to form a combination effect. The welding wire of the AISI 321 stainless steel was deposited onto AISI 1040 steel substrate by using tungsten inert gas welding process. To evaluate and compare the behavior of the deposited material, the cumulative mass loss curves were attained and discussed. Moreover, the surface topography and scanning electron microscope (SEM) micrographs were utilized to characterize the worn surface after the cavitation tests. The results showed that the surface subjected to cavitation was more affected when applying water-voltage condition comparing with the 3.5% NaCl solution condition. The results of material loss, surface roughness and scanning electron microscope are fairly consistent with each other. This study highlights the effect of electrochemical-mechanical combinations on resistance to cavitation erosion-corrosion. © 2019 IOP Publishing Ltd.Foundation for Assistance to Small Innovative Enterprises in Science and Technology, FASIE: 0035960This work was done within the state order of IMP UB RAS on the subject no. AAAA-A18-118020190116-6, within the state order of IMP UB RAS on the subject “Laser”, and IES UB RAS on the subject no. AAAA-A18-118020790147-4. The present study was supported by FASIE, program Development-NTI 2017, project No. 0035960. Microhardness, surface roughness and SEM were done on the equipment installed at the Plastometriya collective use center of IES UB RAS

Measurement of the e+e−→K+K−π+π−e^+e^- \to K^+K^-\pi^+\pi^- cross section with the CMD-3 detector at the VEPP-2000 collider

The process $e^+e^- \to K^+K^-\pi^+\pi^-$ has been studied in the center-of-mass energy range from 1500 to 2000\,MeV using a data sample of 23 pb$^{-1}$ collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. Using about 24000 selected events, the $e^+e^- \to K^+K^-\pi^+\pi^-$ cross section has been measured with a systematic uncertainty decreasing from 11.7\% at 1500-1600\,MeV to 6.1\% above 1800\,MeV. A preliminary study of $K^+K^-\pi^+\pi^-$ production dynamics has been performed