Superconductivity as a probe of magnetic switching and ferromagnetic stability in Nb/Ni multilayers

The temperature and field dependences of the AC and DC magnetic moment of superconducting and ferromagnetic Nb/Ni multilayers were measured using a SQUID magnetometer with magnetic field applied parallel to the multilayer plane. Periodic kinks in the superconducting upper critical field are evidence for nucleation of a hierarchy of Abrikosov vortex lattices aligned parallel to the multilayer. Small cusps in the low-field, isothermal DC magnetization are evidence that supercurrents are sensitive to extremely small changes in the Ni layer magnetization. Smooth ferromagnetic hysteresis is observed in the normal state, but is supplanted below the superconducting transition by two reproducible discontinuities that indicate magnetic switching of the Ni layers is tightly coupled to the supercurrents. The discontinuities are attributed to the non-dipole character of the moment near switching fields and, therefore, cannot be analyzed by standard magnetometer software. Ferromagnetic resonance spectra were measured in parallel and perpendicular DC magnetic fields at room temperature and 4.2 K, and resulting data suggest that Ni layers interact magnetically in the superconducting state

Разработка научных основ технологий активации электродов для электролиза воды.

Electrochemical activity of electrodes with different catalysts is investigated for the reactions of hydrogen and oxygen evolution. The expediency of use of the developed methods of activation of electrodes for electrolysis of water is shown.Мтодом вольтамперометрии исследована электрохимическая активность электродов с различными катализаторами реакций выделения водорода и кислорода. Показана целесообразность использования разработанных методов активации электродов для электролиза воды

Measurement of the neutron timelike electromagnetic form factor with the SND detector

The results of the measurement of the $e^+e^- \to n \bar{n}$ cross section and effective neutron timelike form factor are presented. The data taking was carried out in 2020-2021 at the VEPP-2000 $e^+e^-$ collider in the center-of-mass energy range from 1891 to 2007 MeV. The general purpose nonmagnetic detector SND is used to detect neutron-antineutron events. The event selection is performed using the time-of-flight technique. The measured cross section is 0.4-0.6 nb. The neutron form factor in the energy range under study varies from 0.3 to 0.2.Comment: 13 pages, 8 figure

Tunka Advanced Instrument for cosmic rays and Gamma Astronomy

The paper is a script of a lecture given at the ISAPP-Baikal summer school in 2018. The lecture gives an overview of the Tunka Advanced Instrument for cosmic rays and Gamma Astronomy (TAIGA) facility including historical introduction, description of existing and future setups, and outreach and open data activities.Comment: Lectures given at the ISAPP-Baikal Summer School 2018: Exploring the Universe through multiple messengers, 12-21 July 2018, Bol'shie Koty, Russi

Ультрасонография черепа и скальпа у детей: обзор

INTRODUCTION: An important task of modern pediatrics is to ensure radiation safety of diagnostic examinations, especially in young children. One of the options for reducing radiation exposure at the stages of screening diagnostics and dynamic monitoring is a wider use of ultrasound.OBJECTIVE: To analyze the data of domestic and foreign literature on the possibilities of ultrasound examination of the cranial vault bones, cranial sutures and scalp in children.MATERIALS AND METHODS: The literature search was performed in open Russian and English databases Medline, PubMed, Web of Science, RSCI, eLIBRARY using keywords and phrases: «skull ultrasound», «scalp ultrasound», «cranial sutures ultrasound», «point of care ultrasound», «pediatric POCUS» without limitation of retrospective depth.RESULTS: Based on the literature data and our own long-term experience in the use of cranial ultrasonography in clinical practice, the indications and examination technique, as well as the key ultrasound signs of the most frequent types of pathology are described. Prospects of scalp and skull ultrasonography within PoCUS, FAST, including the use of portable sonoscopes based on smartphones and tablets are outlined.CONCLUSION: Ultrasound of the skull and scalp is a quick, simple, affordable, harmless method of screening and monitoring the most frequent types of pathologies of the cranial vault bones, cranial sutures, and soft tissues of the scalp in children (for example, fractures, synostoses, neoplasms).ВВЕДЕНИЕ: Важная задача современной педиатрии — обеспечение лучевой безопасности диагностических исследований, особенно у детей младших возрастных групп. Одним из вариантов снижения лучевой нагрузки на этапах скрининг-диагностики и динамического наблюдения является более широкое применение ультрасонографии.ЦЕЛЬ: Проанализировать данные отечественной и зарубежной литературы, посвященной возможностям ультразвукового исследования костей свода черепа, черепных швов и скальпа у детей.МАТЕРИАЛЫ И МЕТОДЫ: Поиск литературы осуществлялся в открытых информационных базах на русском и английском языке Medline, PubMed, Web of Science, РИНЦ, еLIBRARY по ключевым словам и словосочетаниям: «ультрасонография черепа», «ультрасонография скальпа», «ультрасонография черепных швов», «skull ultrasound», «scalp ultrasound», «cranial sutures ultrasound», «point of care ultrasound», «pediatric POCUS» без ограничения глубины ретроспекции.РЕЗУЛЬТАТЫ: На основании данных литературы и собственного многолетнего опыта применения ультрасонографии черепа в клинической практике описаны показания и методика проведения исследования, а также ключевые ультразвуковые признаки наиболее частых видов патологии. Обозначены перспективы ультрасонографии скальпа и  черепа в  рамках PoCUS, FAST, в том числе с применением портативных соноскопов, основанных на смартфонах и планшетах.ЗАКЛЮЧЕНИЕ: Ультрасонография черепа и  скальпа  — быстрый, простой, доступный, безвредный метод скрининга и мониторинга наиболее частых видов патологии костей свода черепа, черепных швов и мягких тканей волосистой части головы у детей (например, переломов, синостозов, новообразований)

Study of the process e+e−→ωπ0→π+π−π0π0e^+e^- \to \omega\pi^0 \to \pi^+\pi^-\pi^0\pi^0 in the energy range 1.05−2.001.05-2.00 GeV with SND

The process $e^+e^- \to \omega\pi^0 \to \pi^+\pi^-\pi^0\pi^0$ is studied in the center-of-mass energy region $1.05-2.00$ GeV using data with an integral luminosity of about 35 pb$^{-1}$ collected with the SND detector at the VEPP-2000 $e^+e^-$ collider. In the energy range under study, the value of the measured Born cross section varies from 0.7 to 18 nb. The statistical uncertainty of the cross section is $2-23$%, while the systematic uncertainty is in the range of $3.0-14.2$%. The results are consistent with previous measurements but have better accuracy.Comment: 13 pages, 11 figure

Study of the process e+e−→ηγ→7γe^+e^-\to\eta\gamma\to 7\gamma in the energy range s\sqrt{s} = 1.07 -- 2 GeV

The $e^+e^-\to\eta\gamma$ cross section is measured in the center-of-mass energy range from 1.07 to 2.00 GeV in the decay channel $\eta\to 3\pi^0$, $\pi^0\to\gamma\gamma$. The data set with an integrated luminosity of 242 pb$^{-1}$ accumulated in the experiment with the SND detector at the VEPP-2000 $e^+e^-$ collider is analyzed.Comment: 12 pages, 3 figures