Drift of domain walls in a harmonic magnetic field

It is shown that a two-step form of the dynamic magnetization curve (and the hysteresis loop) established for a multiaxial ferrite-garnet wafer with a low quality factor (Q < 1) and considerable anisotropy in the plane (K p /K u = 14) in the frequency range of 25-1000 Hz is explained by the reconstruction of the dynamic domain structure, particularly by the established features of the drift of domain boundaries in the harmonic magnetic field. © 2013 Allerton Press, Inc

Automated system for diagnosing craniocerebral injury

A Russian national computing and communication system designed to assist non-specialized physicians in the diagnosis and treatment of craniocerebral injury is described

Micromagnetic Structures near a Second Order Phase Transition in Monocrystalline Ferrite Garnet Plates

The main parameters of micromagnetic structure formation in a vicinity of a second order phase transition were determined experimentally and theoretically. The theoretical study was performed using micromagnetic approach. External magnetic field $H_{c}$ of appearance of micromagnetic structure and micromagnetic structure period $L_{c}$ were determined for (001)-oriented plate with uniaxial $K_{u}$ and cubic K₁ magnetic anisotropy. The plate was saturated by the field applied in its plane. In the model we assumed that magnetization vector undergoes small deviations from equilibrium if magnetic field is slightly reduced. These deviations are periodic in nature: micromagnetic structure has a form of a plane wave. Dependences of $H_{c}$ and $L_{c}$ on an azimuthal angle of external magnetic field and on anisotropy constants $K_{u}$ and K₁ were derived analytically in this work. Experimental studies of micromagnetic structure near the second order phase transition were conducted on (EuEr)₃(FeGa)₅O₁₂ (001)-oriented 50 μm thick ferrite-garnet plate with $K_{u}$ = 5700 erg/cm³ and K₁=-3700 erg/cm³. Micromagnetic structure was revealed by means of magnetooptic Faraday effect. The in-plane field was increased up to 2000 Oe. Experimentally determined values of $H_{c}$ and $L_{c}$ were compared with theoretical estimates

Experimental and Theoretical Study of Stripe Magnetic Domain Structure Drift in Iron Garnet Crystals

The results of experimental and theoretical study of magnetic domain structure drift in low frequency oscillating magnetic field oriented perpendicular to the sample plate are presented. Experimental study was performed on uniaxial iron garnet (TbErGd)₃(FeAl)₅O₁₂ (111) plate with rhombic anisotropy for the case when orientation of domain walls of stripe domains is preserved. Dynamic domain structure was revealed by means of magnetooptic Faraday effect and registered by high speed digital camera at the speed equal to 1200 fps. Theoretical model based on the motion equations for coupled harmonic oscillators that takes into account attenuation and field inhomogeneity along the plate is proposed

УПРОЧНЕНИЕ БЫСТРОРЕЖУЩИХ И ШТАМПОВЫХ СТАЛЕЙ МЕТОДОМ ТЕРМОЦИКЛИЧЕСКОЙ ОБРАБОТКИ

The composite structure, mechanisms and nature of strengthening of tool steels subjected to strengthening thermo-cycling treatment are presented (STCT). The influence of the STCT process on the structure and mechanical properties of tool steels are examined. The developed technology permits increasing the wear resistance of steel tools by a factor of 1.4–12 in comparison with traditionally heat-treated ones.Исследованы композиционная структура, механизмы и характер упрочнения инструментальных сталей, подвергнутых термоциклической обработке (УТЦО). Изучено влияние процесса УТЦО на структуру и механические свойства инструментальных сталей. Разработанная технология повышает стойкость стальных инструментов в 1,4–12 раз, по сравнению с традиционно термообработанными

УПРОЧНЕНИЕ СТАЛЕЙ ПРИ ДИФФУЗИОННОМ НАСЫЩЕНИИ КАРБИДООБРАЗУЮЩИМИ МЕТАЛЛАМИ

The structure and properties of steels subjected to thermochemical heat treatment in multi-carbide forming media are studied. As a result, two types of composite structures are formed. Regularities in the formation of diffusion multi-carbide coatings are established. New models of complex diffusion saturation of steel by transition metals is proposed on the basis of thermodynamics and kinetics.Исследованы структура и свойства сталей, подвергнутых химико-термической обработке в многокомпонентных карбидообразующих средах. В результате в насыщаемой стали формируются 2 типа композиционных структур. Установлены закономерности формирования поликарбидных диффузионных покрытий. На основе термодинамики и кинетики смоделированы процессы комплексного диффузионного насыщения стали переходными металлами

Unidirectional motion of magnetic domain walls: The experiment and numerical simulation

The results of study of unidirectional motion of topologically different domain structures under the influence of periodic bipolar and unipolar magnetic field pulses applied perpendicular to the sample plane of (111) iron garnet single crystal plate are presented. The response of the domain structure to the field pulses was studied by direct observations utilizing the stroboscopic technique. Experimentally obtained dependences of the speed of unidirectional motion of stripe domains on the parameters of external bipolar pulsed magnetic field are compared with the results of numerical simulations. © Published under licence by IOP Publishing Ltd.Ministry of Science and Higher Education of the Russian Federation: 3.6121.2017The work was performed within the framework of the basic part of the state assignment of the Ministry of Science and Higher Education of the Russian Federation (project 3.6121.2017)

Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV

A search for the standard model Higgs boson in the H to ZZ to 2l 2nu decay channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7 TeV is presented. The data were collected at the LHC, with the CMS detector, and correspond to an integrated luminosity of 4.6 inverse femtobarns. No significant excess is observed above the background expectation, and upper limits are set on the Higgs boson production cross section. The presence of the standard model Higgs boson with a mass in the 270-440 GeV range is excluded at 95% confidence level.Comment: Submitted to JHE

Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV

The t t-bar production cross section (sigma[t t-bar]) is measured in proton-proton collisions at sqrt(s) = 7 TeV in data collected by the CMS experiment, corresponding to an integrated luminosity of 2.3 inverse femtobarns. The measurement is performed in events with two leptons (electrons or muons) in the final state, at least two jets identified as jets originating from b quarks, and the presence of an imbalance in transverse momentum. The measured value of sigma[t t-bar] for a top-quark mass of 172.5 GeV is 161.9 +/- 2.5 (stat.) +5.1/-5.0 (syst.) +/- 3.6(lumi.) pb, consistent with the prediction of the standard model.Comment: Replaced with published version. Included journal reference and DO

Проблема выбора метода реваскуляризации при сочетанном поражении коронарных и сонных артерий. Обзор действующих рекомендаций и серии статей

This article provides data from the current Russian (National guidelines for the management of patients with diseases of the brachiocephalic arteries of 2013; Recommendations “Blockage and stenosis of the carotid artery” of the Ministry of Health of the Russian Federation, 2016) and foreign (European Society of Cardiology / European Society of Vascular Surgeons for Diagnosis and Treatment Peripheral Artery Diseases 2017; Recommendations for myocardial revascularization of the European Society of Cardiology and the European Association of Cardio-Thoracic Surgeons 2018) recommendations regarding the choice of a revascularization strategy for combined coronary and carotid artery disease. Conclusions are drawn about the unresolved issue. A literature review of the largest series of Russian articles by one institution devoted to this topic was carried out. Hospital and long-term outcomes have been demonstrated, as well as predictors of complications for various revascularization strategies. The stages of creation and the results of approbation of a new computer program for risk stratifi cation, which makes it possible to determine the mathematical probability of the development of unfavorable cardiovascular events during the implementation of various surgical tactics, taking into account the individual characteristics of the patient. A conclusion was made about the effectiveness of this development.В настоящей статье приведены данные действующих российских (Национальные рекомендации по ведению пациентов с заболеваниями брахиоцефальных артерий 2013 года; Рекомендации «Закупорка и стеноз сонной артерии» Министерства здравоохранения Российской Федерации, 2016 года) и зарубежных (Европейского общества кардиологов/Европейского общества сосудистых хирургов по диагностике и лечению заболеваний периферических артерий 2017 года; Рекомендации по реваскуляризации миокарда Европейского общества кардиологов и Европейской ассоциации кардиоторакальных хирургов 2018 года) рекомендаций, посвященные выбору стратегии реваскуляризации при сочетанном поражении коронарных и каротидных артерий. Сделаны выводы о нерешенности данного вопроса. Выполнен обзор литературы самой большой серии российских статей одного учреждения, посвященных этой теме. Продемонстрированы госпитальные и отдаленные результаты, а также предикторы развития осложнений различных стратегий реваскуляризации. Представлены этапы создания и результаты апробации новой компьютерной программы стратификации риска, позволяющей определить математическую вероятность развития неблагоприятных кардиоваскулярных событий при реализации разных хирургических тактик с учетом индивидуальных особенностей пациента. Сделано заключение об эффективности этой разработки