Piezoelectric control of the magnetic anisotropy via interface strain coupling in a composite multiferroic structure

We investigate theoretically the magnetic dynamics in a ferroelectric/ferromagnetic heterostructure coupled via strain-mediated magnetoelectric interaction. We predict an electric field-induced magnetic switching in the plane perpendicular to the magneto-crystalline easy axis, and trace this effect back to the piezoelectric control of the magnetoelastic coupling. We also investigate the magnetic remanence and the electric coercivity

Ultrasonic Preparation of Coating Surfaces

For various methods of obtaining coatings, the general stage of technology is the preparation of the surface for the application of the coating material. The properties of the resulting coating directly depend on the quality of preparation. In the process of obtaining coatings, the most common application of ultrasonic treatment to clean the surface from all kinds of contaminants. However, with a sufficient intensity of processing, ultrasound has a significant effect on the geometric properties of the surfaces of products. Prolonged cavitation action leads to changes in the roughness and sub-roughness of the metal surface. The article discusses the effectiveness of the use of ultrasonic liquid treatment in the preparation of surfaces for coating. The results of studies on the effect of cavitation on the change in roughness, sub-roughness and oil absorption are presented. Revealed an improvement in the adhesion properties of surfaces after ultrasonic liquid treatment

Solution-processed flexible broadband ZnO photodetector modified by Ag nanoparticles

In this work, we present flexible broadband photodetectors (PDs) fabricated by a deposition of nanostructured zinc oxide (ZnO) films on polyimide (PI) substrates by using cheap and scalable aqueous method Successive Ionic Layer Adsorption and Reaction (SILAR). In order to increase the long-wavelength absorption of the nanostructured ZnO layer, we created its intrinsic defects, including oxygen vacancies by post-treatment at 300 °C in vacuum and thus the light-sensitive material ZnO/PI was obtained. Then we applied silver nanoparticles (Ag NPs) from a silver sol onto a nanostructured ZnO film, which were visualized using SEM in the form of spheres up to 100 nm in size that increased the photocurrent and figures of merit of thus obtained light-sensitive material ZnO_Ag/PI due to localized surface plasmon resonance and double Schottky barriers at the Ag-ZnO interface. To fabricate photodetectors based on a photoconductive effect, these ZnO/PI and ZnO_Ag/PI materials were equipped with ohmic aluminum contacts. The spectral responsivity (Rλ up to 275 A/W to UV light) of solution-processed flexible broadband photodetector based on ZnO_Ag/PI material at different wavelengths of light and light power densities is better than Rλ of the ZnO/PI photodetector, and at least an order of magnitude higher than Rλ of photodetectors based on nanostructured zinc oxide described in recent articles. The external quantum efficiency (EQE) of both PDs in this study in UV–Vis-NIR spectra is very high in the range from 1∙102 to 9∙104 % and is better or of the same order of magnitude as the EQE data of modern flexible broadband high-sensitivity PDs based on nanostructured heterostructures containing ZnO. The specific detectivity in UV–Vis-NIR spectra is large for ZnO/PI (from 3.5∙1010 to 1∙1012 Jones) and especially for ZnO_Ag/PI (from 1.6∙1011 to 8.6∙1013 Jones), which indicates the ability of the PDs based on light-sensitive materials ZnO/PI and ZnO_Ag/PI to recognize a very weak light signal

Methods of working with pharmacovigilance signals

This article is about the efficiency of web based systems for pharmacovigilance (PV) processes management in connection with pharmacovigilance signals based on case study of the implementation of Flex Databases PV system. It describes principles of signals management, provides analyses of modern methods of signal management (quality and quantity), and also describes perspective methods of signals management. The article highlights the importance of signal management in pharmacovigilance as an obligatory process for all companies-holders of registration certificate and investigation companies in all EAEU member states, including Russia

Discrete structure of ultrathin dielectric films and their surface optical properties

The boundary problem of linear classical optics about the interaction of electromagnetic radiation with a thin dielectric film has been solved under explicit consideration of its discrete structure. The main attention has been paid to the investigation of the near-zone optical response of dielectrics. The laws of reflection and refraction for discrete structures in the case of a regular atomic distribution are studied and the structure of evanescent harmonics induced by an external plane wave near the surface is investigated in details. It is shown by means of analytical and numerical calculations that due to the existence of the evanescent harmonics the laws of reflection and refraction at the distances from the surface less than two interatomic distances are principally different from the Fresnel laws. From the practical point of view the results of this work might be useful for the near-field optical microscopy of ultrahigh resolution.Comment: 25 pages, 16 figures, LaTeX2.09, to be published in Phys.Rev.

ВОЗМОЖНОСТИ ИНТЕРВЕНЦИОННОЙ КОРРЕКЦИИ КРИТИЧЕСКОГО АОРТАЛЬНОГО СТЕНОЗА: СOВРЕМЕННОЕ СОСТОЯНИЕ ПРОБЛЕМЫ И ПЕРСПЕКТИВЫ

The paper studies the issues of aortic stenosis etiology and pathogenesis, clinical assessment of severity based on the distinct symptoms of decompensated aortic defect and echocardiographic measures, and modern methods of aortic stenosis correction. Valve replacement is well known as the «gold standard» in the treatment of aortic stenosis. However, the older-age-group patients with different attendant pathologies are likely to have re-operative complications during the valve replacement operation. The alternative methods of aortic stenosis treating are balloon valvuloplasty and transcatheter implantation of the aortic valve. Analyzing the experience of using the minimally invasive methods of critical aortic stenosis correction convincingly shows reduction of re-operative danger among older-age-group patients with different attendant pathologies and persuades to hospitalize old-aged comorbid patients with significant degrees of aortic valve stenosis and advanced degrees of heart failure to special medical centers. There patients can get an integrated approach to the treatment of this disease that leads to improving treatment results and favorable prognosis in this challenging group of patients.В данной статье рассмотрены вопросы этиологии и патогенеза развития аортального стеноза, клиническая оценка степеней тяжести, основанная на выраженности симптомов при декомпенсации аортального порока и эхокардиографических параметрах, и современные методы коррекции аортального стеноза. Общепризнанным «золотым стандартом» в лечении аортального стеноза является протезирование клапана. Однако операция протезирования аортального клапана у пациентов старшей возрастной группы с различной сопутствующей патологией сопряжена с высоким уровнем периоперационных осложнений. Альтернативными способами лечения аортального стеноза являются метод баллонной вальвулопластики и транскатетерная имплантация аортального клапана. Анализ собственного опыта применения данных малоинвазивных методов коррекции критического аортального стеноза убедительно демонстрирует снижение периоперационных рисков у пациентов старшей возрастной группы с сопутствующей патологией и убеждает в необходимости госпитализации коморбидных возрастных пациентов со значительными степенями стеноза аортального клапана и продвинутыми степенями сердечной недостаточности в специализированных центрах, где возможен комплексный подход в лечении данной патологии, который приводит к улучшению результатов лечения и благоприятному прогнозу у этой сложной категории пациентов

HEMITSELLYULOZA AND THEIR NANOBIOCOMPOSITES - PERSPECTIVE NANOSTRUCTURED SINBIOTICS

Natural nanocomposites hemicellulose arabinogalactan and flavonoids isolated (from Siberian larch) and characterized. Additionally nitro- and sulfo-esters of arabinogalactan and its calcium salt are synthesized and. characterized. All of the derivatives of the beta-hemicellulose arabinogalactan. are water-soluble and are promising prebiotics on the example test-strain Bifidobacterium bifidum. (except for the nitrate esters of arabinogalactan)

Quantum formulation for nanoscale optical and material chirality: symmetry issues, space and time parity, and observables

To properly represent the interplay and coupling of optical and material chirality at the photon-molecule or photon-nanoparticle level invites a recognition of quantum facets in the fundamental aspects and mechanisms of light-matter interaction. It is therefore appropriate to cast theory in a general quantum form, one that is applicable to both linear and nonlinear optics as well as various forms of chiroptical interaction including chiral optomechanics. Such a framework, fully accounting for both radiation and matter in quantum terms, facilitates the scrutiny and identification of key issues concerning spatial and temporal parity, scale, dissipation and measurement. Furthermore it fully provides for describing the interactions of light beams with a vortex character, and it leads to the complete identification of symmetry conditions for materials to provide for chiral discrimination. Quantum considerations also lend a distinctive perspective to the very different senses in which other aspects of chirality are recognized in metamaterials. Duly attending to the symmetry principles governing allowed or disallowed forms of chiral discrimination supports an objective appraisal of the experimental possibilities and developing applications