Nanostructuring effects in soft magnetic films and film elements with magnetic impedance

The magnetization reversal and magnetic impedance (MI) of films and film elements based on Fe19Ni81 and Fe72. 5Cu1. 1Nb1. 9Mo1. 5Si14. 2B8. 7 alloys with a varied thickness, heat-treatment temperature, and the number of thin Cu interlayers are studied. The dependences of the coercive force and the magnitude of MI on these parameters are found. Layered structuring is shown to be an effective method for improving the functional characteristics of MI elements. In elements containing nanocrystalline Fe19Ni81 layers, this is related to the restructuring of a magnetic structure; in elements containing amorphous Fe72. 5Cu1. 1Nb1. 9Mo1. 5Si14. 2B8. 7 layers, this improvement is likely to be caused by a decrease in the effective electrical resistivity. © 2013 Pleiades Publishing, Ltd

Thin film magnetoimpedance sensor for detection of stray fields in 3D-configuration

This work was performed under financial support of The Ministry of Education and Science of the Russian Federation, project № 2582

Giant Magnetoimpedance for the Creation of Low Magnetic Field Sensors in the Field of Bioapplications

В данной работе представлены результаты расчета планарных структур на основе многослойной пленки FeNi/Cu/FeNi, полученные с помощью численного моделирования, а также было проведено моделирование движения магнитных наночастиц (МНЧ) маггемита (.-Fe2O3) по коронарному сосуду конкретного пациента, геометрия которого получена при плановом обследовании, для оценки возможности диагностики особенностей геометрии кровеносного сосуда с помощью ГМИ датчика. Предложенный подход может быть использован при разработке и тестировании магнитных датчиков, а также в фундаментальных исследованиях особенностей чувствительных элементов.This article presents the results of calculating planar structures based on a FeNi/Cu/FeNi multilayer film, obtained using numerical simulation, as well as modeling the movement of magnetic nanoparticles (MNPs) of maghemite (.-Fe2O3) along the coronary vessel of a particular patient, the geometry of which was obtained during a routine examination, to assess the possibility of diagnosing the features of the geometry of a blood vessel using a GMI sensor. The proposed approach can be used in the development and testing of magnetic sensors, as well as in fundamental research of the characteristics of sensitive elements

Magnetoimpedance of CoFeCrSiB Ribbon-Based Sensitive Element with FeNi Covering: Experiment and Modeling

Soft magnetic materials are widely requested in electronic and biomedical applications. Co-based amorphous ribbons are materials which combine high value of the magnetoimpedance effect (MI), high sensitivity with respect to the applied magnetic field, good corrosion stability in aggressive environments, and reasonably low price. Functional properties of ribbon-based sensitive elements can be modified by deposition of additional magnetic and non-ferromagnetic layers with required conductivity. Such layers can play different roles. In the case of magnetic biosensors for magnetic label detection, they can provide the best conditions for self-assembling processes in biological experiments. In this work, magnetic properties and MI effect were studied for the cases of rapidly quenched Co67Fe3Cr3Si15B12 amorphous ribbons and magnetic Fe20Ni80/Co67Fe3Cr3Si15B12/Fe20Ni80 composites obtained by deposition of Fe20Ni80 1 μm thick films onto both sides of the ribbons by magnetron sputtering technique. Their comparative analysis was used for finite element computer simulations of MI responses with different types of magnetic and conductive coatings. The obtained results can be useful for the design of MI sensor development, including MI biosensors for magnetic label detection. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.Funding: This research was funded by Ministry of Science and Higher Education of the Russian Federation, grant number FEUZ-2020-0051, Ministry of Science and Higher Education of the Russian Federation, grant number АААА-А19-119070890020-3, Act 211 Government of the Russian Federation, grant number 02. A03.21.0006

Динамика изменений кровообращения в легких при развитии хронической дыхательной недостаточности у пациентов с хронической обструктивной болезнью легких и идиопатическим фиброзирующим альвеолитом

The aim of this study was to describe particularities of pulmonary circulation in patients with obstructive (chronic obstructive pulmonary disease (COPD)) or restrictive (idiopathic pulmonary fibrosis (IPF)) diseases and to study tendencies of pulmonary blood flow disorders in different pathological mechanisms of chronic respiratory failure (CRF).Methods. Results of image examination (multislice computed tomography, computed angiography, singlephoton emission computed tomography) were analyzed in 150 patients with severe stage 3–4 COPD (phenotype of emphyse ma) complicated by CRF or right heart failure and in 45 patients with IPF and lung «honeycombing».Results. Significant pulmonary circulation disorders were seen in patients with both obstructive and interstitial diseases complicated by CRF. These changes were caused by parenchyma remodeling, concomitant vascular lesions (pulmonary embolism, thrombosis in situ), cancer and persistent infectious inflammation.Conclusions. Timely detection of changes in pulmonary parenchyma and vessels allows adequate treatment, slowing progression of the disease and improving outcomes. In patients with mild to moderate COPD, therapeutic interventions could improve the reduced blood flow in ischemic areas of the lungs significantly more often than in IPF patients. Early treatment could prevent irreversible change in ischemic lung parenchyma which usually results in CRF development. Virtually, treatment has no effect on pulmonary circulation both in patients with obstructive and restrictive diseases with irreversible changes in pulmonary vessels.Выраженный вентиляционноперфузионный дисбаланс, приводящий к хронической дыхательной недостаточности (ХДН), имеет разную природу при обструктивном и рестриктивном типах дыхательной недостаточности (ДН). Хроническая обструктивная болезнь легких (ХОБЛ) и идиопатический фиброзирующий альвеолит (ИФА) являются типичными представителями этих видов респираторной патологии.Целью исследования явилось определение особенностей нарушения кровообращения в легких у больных обструктивными (ХОБЛ) и интерстициальными (ИФА) заболеваниями легких и выявление некоторых закономерностей изменений кровотока при различных патофизиологических механизмах формирования ДН.Материалы и методы. Проведен анализ результатов лучевых методов исследования: мультиспиральной компьютерной томографии (КТ) и мультиспиральной компьютерной ангиографии, однофотонной эмиссионной КТ у пациентов (n = 150) с эмфизематозным типом ХОБЛ III–IV стадии в сочетании с ХДН или правожелудочковой недостаточностью и пациентов (n = 45) с ИФА в стадии формирования «сотового» легкого.Результаты. При ХДН у больных как с обструктивной, так и с интерстициальной патологией развиваются значительные нарушения кровообращения в легких, чему способствует ремоделирование в зоне паренхимы, а также сопутствующая сосудистая патология (тромбоэмболия легочной артерии, тромбозin situ), онкологические и персистирующие инфекционные воспалительные процессы. Своевременная диагностика изменений, протекающих в легочной паренхиме и сосудах, позволяет своевременно назначить адекватную этиологическую терапию и существенно повлиять на прогрессирование и прогноз заболевания.Заключение. В результате лечебных мероприятий у больных ХОБЛ легкой и средней степени тяжести достоверно чаще, чем у пациентов с ИФА, восстанавливается редуцированный кровоток в местах ишемиилегочной ткани, где еще не развились необратимые изменения, особенно при присоединении сосудистой патологии. При наличии необратимых морфологических изменений в паренхиме легких, приводящих к развитию ХДН, у больных как при обструктивном, так и рестриктивном типах респираторной патологии лечебные мероприятия практически не влияют на состояние микроциркуляции в малом круге кровообращения

Amorphous FeCoCrSiB Ribbons with Tailored Anisotropy for the Development of Magnetic Elements for High Frequency Applications

The ferromagnetic resonance (FMR) in the frequency range of 0.5 to 12.5 GHz has been investigated as a function of external magnetic field for rapidly quenched Fe3Co67Cr3Si15B12 amorphous ribbons with different features of the effective magnetic anisotropy. Three states of the ribbons were considered: as-quenched without any treatment; after relaxation annealing without stress at the temperature of 350 °C during 1 h; and after annealing under specific stress of 230 MPa at the temperature of 350 °C during 1 h. For FMR measurements, we adapted a technique previously proposed and tested for the case of microwires. Here, amorphous ribbons were studied using the sample holder based on a commercial SMA connector. On the basis of the measurements of the reflection coefficient S11, the total impedance including its real and imaginary components was determined to be in the frequency range of 0.5 to 12.5 GHz. In order to confirm the validity of the proposed technique, FMR was also measured by the certified cavity perturbation technique using a commercial Bruker spectrometer operating at X-band frequency of 9.39 GHz. As part of the characterization of the ribbons used for microwave measurements, comparative analysis was performed of X-ray diffraction, optical microscopy, transmission electron microscopy, inductive magnetic hysteresis loops, vibrating sample magnetometry, magneto-optical Kerr effect (including magnetic do-mains) and magnetoimpedance data for of all samples. © 2022 by the author. Licensee MDPI, Basel, Switzerland.Ministry of Education and Science of the Russian Federation, Minobrnauka; Euskal Herriko Unibertsitatea, EHUFunding: The research funding from the Ministry of Science and Higher Education of the Russian Federation (Ural Federal University Program of Development within the Priority-2030 Program) is gratefully acknowledged. Further funding from University of the Basque Country UPV/EHU Research Groups Funding (GMMM) is similarly gratefully acknowledged

Five problems in legal maintenance of IT projects

Objective: to assess the compliance of traditional approaches to IT projects legal maintenance with the modern methods of organizing the process of digital products development, to identify the existing problems in this area and suggest possible ways to resolve them. Methods: the research used the logical method and the method of analyzing judicial practice, the inductive method, the method of comparison, and the method of scientific abstraction. Results: digitalization facilitated the development of the services market for IT projects and their maintenance. Legal maintenance of such projects often faces a significant discrepancy between the positions of the customer and the contractor, especially when part of the project is accomplished. Based on the analysis of judicial practice of IT projects using the Agile methodology, the most significant and problematic legal aspects of implementation were identified, and conflict situations between customers and performers of IT projects were analyzed.Scientific novelty: five key problems of IT projects legal maintenance that use flexible management methods are identified. A universal model for implementing legal functions in Agile projects is proposed.Practical significance: the proposed scheme of legal maintenance of IT projects can be used to regulate the legal relationships of their participants and may help to reduce the conflict level and speed up the process of digital products development using the Agile methodology

MAGNETODYNAMIC STUDY OF THE FERROLIQUID CURRENT IN BLOOD VESSELS OF COMPLEX GEOMETRY: FOCUS ON MAGNETIC DETECTION SYSTEMS

The aim of this work is to develop a computer model of the hemodynamic flow in real blood vessels with magnetic nanoparticles, to assess the possibility of using a magnetic sensor based on the effect of giant magnetoimpedance for visualization of the structure of arterial system.Работа выполнена при поддержке гранта РНФ 18-19-00090