Complex application of magnetic and magnetoacoustic parameters in the structuroscopy of ferromagnetic materials

The set of magnetic parameters and amplitude-frequency spectral characteristics of magnetoacoustic emission (MAE) of a large group of metal ferromagnetic materials differing in their physical properties and size are investigated. It is shown that the change in critical fields determined by the shape of the magnetization curve and the hysteresis loop of bulk samples with an increase in the annealing temperature of cold-deformed steel 20G is 1.5-3 times greater than the change in such well-known parameters for estimating the stress-strain state, such as coercive force and residual magnetic induction. It has been established that the amplitude of magnetoacoustic emission correlates with the residual magnetic induction, which makes it possible to recommend the complex application of these testing parameters in scanning systems of structuroscopy of ferromagnetic materials. © Published under licence by IOP Publishing Ltd.Russian Foundation for Basic Research, RFBR: 18-38-00253The research was carried out within the state assignment of Minobrnauki of Russia (theme “Diagnostics” No. АААА-А18-118020690196-3), supported in part by RFBR (project No. 18-38-00253)

ОСОБЕННОСТИ ИММУННОГО СТАТУСА У СПОРТСМЕНОВ, СПЕЦИАЛИЗИРУЮЩИХСЯ В АКАДЕМИЧЕСКОЙ ГРЕБЛЕ И ГАНДБОЛЕ

The work is perfromed at the department of the hospital therapy GPMU, laboratory of llergiology and immunology of the research-practical Center of Dental faculty of SpbGMU named after I. Р. Pavlov. State of cellular and humoral immunity at the beginning and at the end of the training year of 15-17 years old young sportsmen of the first level and candidates masters of sports involved in an academic rowing and handball was studied. The athletes of both groups showed significant improvements as compared to the persons not involved in sports, lymphocyte apoptosis inducers (CD95+), the natural killer cells (CD16 + ) and B-lymphocytes (CD20 + ). Over time, in the athletes, regardless the sport, unidirectional changes are detected, encompassing the enhancing of the relative number of CD25+ with receptors for IL2, and immunoglobulin levels.Работа выполнена на базе кафедры госпитальной терапии ГПМУ, лаборатории аллергологии и иммунологии Научно-практического центра стоматологического факультета СПбГМУ им. акад. И.П. Павлова. Изучено состояние клеточного и гуморального звена иммунитета в начале и конце учебно-тренировочного года у юношей-спортсменов 15 - 17 лет, 1 разряда и кандидатов в мастера спорта, занимающихся академической греблей и гандболом. У спортсменов обеих групп установлено значительное повышение относительно лиц, не занимающихся спортом, лимфоцитов - индукторов апоптоза (CD95+), естественных киллеров (CD16+) и В-лимфоцитов (CD20 + ). В динамике у спортсменов вне зависимости от вида спорта происходят однонаправленные изменения, выражающиеся в повышении относительного числа CD25+ с рецепторами к ИЛ2 и уровня иммуноглобулинов

Magnetic parameters of control of stress-strained state carbon steels

The complex of magnetic and magnetoacoustic properties of cold and annealed at different temperatures steels with a carbon content of 0.2% (steel 20G) and 0.7% (steel 70G) has been researched. It was found that with increasing annealing temperature of these steels up to 700 0C monotonically increasing values associated with the intensity of irreversible processes of magnetization reversal. It is shown that the coercive force of 70G steel by varying the annealing changes nonmonotonically and can not be a parameter control. Among quasistatically measured magnetic parameters to control the annealing can be used residual induction and the induction of the coercive return. The structural sensitivity of such parameters of the magnetoacoustic emission (MAE) as amplitude, base frequency, maximum field of MAE has been researched. The amplitude and the maximum field MAE correlate with remanence substances investigated steels may be used for diagnostics.Исследован комплекс магнитных и магнитоакустических свойств холоднодеформированных и отожженных при различных температурах сталей с содержанием углерода 0,2 % (сталь 20Г) и 0,7 % (сталь 70Г). Установлено, что при увеличении температуры отжига этих сталей вплоть до 700 0С монотонно растут значения параметров, связанных с интенсивностью необратимых процессов перемагничивания. Показано, что коэрцитивная сила стали 70Г при вариации отжига меняется немонотонно и не может быть параметром контроля. Из числа квазистатически измеряемых магнитных параметров для контроля отжига могут быть использованы остаточная индукция и индукция коэрцитивного возврата. Исследована структурная чувствительность таких параметров магнитоакустической эмиссии (МАЭ), как амплитуда, основная частота, поле максимума МАЭ. Показано, что амплитуда и поле максимума МАЭ коррелируют с остаточной магнитной индукцией вещества исследованных сталей и могут быть использованы при диагностике.Работа выполнена в рамках государственного задания ФАНО России по теме «Диагностика» № 01201463329

TECHNIQUE FOR MEASURING THE MAGNETIC PROPERTIES OF A SUBSTANCE IN AN OPEN MAGNETIC CIRCUIT

As a result of the theoretical and experimental studies, a technique for measuring the residual magnetic induction of matter in an open magnetic circuit is proposed. The residual magnetic induction can be used to diagnose the structural-phase and stress-strain state of ferromagnetics.Работа выполнена в рамках государственного задания МИНОБРНАУКИ России («Диагностика», номер госрегистрации 122021000030-1)

Peculiarities of Epidemiological Situation on Crimean Hemorrhagic Fever in the Russian Federation at the Current stage

Objective. The analysis of epidemiological situation on Crimean hemorrhagic fever (CHF) in the Russian Federation at the current stage, identification of ways to improve the epidemiological surveillance and prophylaxis of the disease. Materials and methods. Data from statistical documentation and results of annual epizootiological monitoring of the CHF natural focus provided by the Administrations of the Rospotrebnadzor, Centers of Hygiene and Epidemiology in entities of the Southern and the North-Caucasian Federal Districts, Reference Centre for CHF monitoring, Research Anti-Plague Institutions and Plague Control stations were used for work. Results and conclusions. The CHF epidemio­logical situation remains unstable, the cases of the disease (including fatal) are registered every year. High activity of the CHF natural focus persists. The northward expansion of CHF natural focus boundaries is observed. The main causes of the unfavorable CHF epidemiological situation are associated with increase in the numbers and period of activity of ticks Hyalomma marginatum due to favorable climatic conditions. The list of priority measures to stabilize the CHF epidemiological situation developed by the Rospotrebnadzor has resulted in decrease in CHF cases by 51.9 % in 2017 compared to 2016 across all the territory of the south of the Russian Federation. The CHF morbidity in 2018 was 1.5 times lower than the average multi-year values (72 CHF patients). The number of CHF cases in comparison to 2017 has decreased by 1.3 times in the Stavropol Territory and by 1.4 times in the Rostov Region. The CHF morbidity has increased in the Astrakhan Region (by 3 times) and Volgograd Region (by 2.3 times). Nosocomial CCHF virus infections cases associated with non-compliance to anti-epidemic regime in hospitals while providing treatment of CHF patients were registered in 2011 (in the Rostov Region) and in 2016 (in the Stavropol Territory). This highlights the need to improve the training of health-care staff for admission of patients with this particularly dangerous infection

APPLICATION OF MACHINE LEARNING FOR SOLVING PROBLEMS OF MAGNETIC STRUCTURE ANALISYS

The possibilities of using magnetic hysteresis loops for training deep neural networks were studied. Hyperparameter optimizers, such as Hyperband, should be used to solve each magnetic structure and phase analisys problem using machine learning.Работа выполнена в рамках государственного задания МИНОБРНАУКИ России («Диагностика» (“Diagnostics”), №122021000030-1)

Epidemiological situation on Crimean-Congo Hemorrhagic Fever in the Russian Federation in 2021

The review presents an analysis of the epidemiological and epizootiological situation on Crimean-Congo hemorrhagic fever (CCHF) in the Russian Federation in 2021. 49 cases of CCHF were detected in 2021, which is 1.53 times higher than in 2020. The mortality rate was 6.1 %. Sporadic cases of CCHF were registered in the Stavropol Territory, Rostov, Volgograd Regions, the Republics of Dagestan and Kalmykia. The incidence rates of CCHF were below the long-term average annual values in the majority of the constituent entities. Epizootiological survey of stationary observation points has revealed that the number of Hyalomma marginatum imago corresponded to the average long-term indicators in 2021, the peak of H. marginatum activity was noted in the II–III decades of May. The proportion of Ixodidae tick pools positive for Crimean-Congo hemorrhagic fever (CCHF) virus markers exceeded the long-term average indexes in a number of regions. On the territory of the natural focus of CCHF, the circulation of the CCHF virus of the genetic lineages “Europe-1” and “Europe-3” was detected in 2021. Based on the analysis of the epidemiological data of the previous year and natural and climatic factors affecting the abundance and vital activity of H. marginatum ticks, risk-based quantitative forecast for the incidence of CCHF in the Stavropol Territory for 2022 has been compiled

EFFECT OF MECHANICAL DEFORMATION ON THE MAGNETIC CHARACTERISTICS OF FERROMAGNETIC OBJECTS MADE OF Fe-Ni ALLOYS

It is shown that cold plastic deformation of a number of iron-nickel alloys leads to a de-crease in the proportion of irreversible processes of magnetization reversal in their curves of return from the coercive force. An explanation of the experimental results is given on the basis of the model.Работа выполнена в рамках государственного задания МИНОБРНАУКИ России (тема «Диагностика», № АААА-А18-118020690196-3)

Digital receivers for low-frequency radio telescopes UTR-2, URAN, GURT

This paper describes digital radio astronomical receivers used for decameter and meter wavelength observations. This paper describes digital radio astronomical receivers used for decameter and meter wavelength observations. Since 1998, digital receivers performing on-the-fly dynamic spectrum calculations or waveform data recording without data loss have been used at the UTR-2 radio telescope, the URAN VLBI system, and the GURT new generation radio telescope. Here we detail these receivers developed for operation in the strong interference environment that prevails in the decameter wavelength range. Data collected with these receivers allowed us to discover numerous radio astronomical objects and phenomena at low frequencies, a summary of which is also presented.Comment: 24 pages, 15 figure