Study of mesoscale irregularities of the refraction coefficient of radiowaves in the troposphere by the methods of numerical simulation

We propose a model of the mesoscale irregular structure of the refraction coefficient of radiowaves and its dynamics in the real atmosphere at altitudes of up to 20 km. This model was verified according to multiyear continuous measurements. The obtained dynamics of the refraction coefficient shows considerable horizontal, vertical, and temporal variability of the mesoscale irregular structure as well as anisotropy of the horizontal spatial structure of the refraction coefficient, which is determined by the fields of wind speed and the synoptic gradient of atmospheric pressure. Dependences of the disturbance of the optical length of the radio paths on the path length, zenith angle, time of the day, and meteorological conditions are found. © 2010 Springer Science+Business Media, Inc

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Characterization Of Epoxy-Coated Oxide Films Using Acoustic Microscopy

An adhesive joint consisting of aluminum adherends bonded with an epoxy adhesive is composed of three main layers. The adherends are usually a few millimeters thick with a layer of epoxy adhesive between one and three hundred microns thick between them. The surfaces of the adherends are typically pre-treated to produce a thin film of porous aluminum oxide, which has a honeycomb-like structure. The epoxy adhesive may then penetrate into these honeycomb cells or pores. The resulting layer between the adhesive and adherend is therefore a micro-composite and it is typically of the order of one micron in thickness. The use of the surface pre-treatment is a major factor in increasing the durability of the adhesive joint when it is exposed to water. Additionally, joints which have been in use for some time, especially ones which have been subject to environmental attack, usually experience a failure along the plane of this film. Therefore, characterization of this epoxy/oxide interlayer is very important in understanding adhesive joints and how they are affected by environmental factors. Unfortunately, not much is known about their mechanical properties

MAGNETIC PROPERTIES OF ULTRAFINE POWDERS ALLOY Mn-Al

Manganese-aluminum alloys has been prepared by induction melting in argon atmosphere. Ferromagnetic phase at these alloys was obtained by annealing in the temperature range 673-773 K. High coercivity state were produce by high-energy ball mill - «attritor». The final annealing was carried out to restore the ferromagnetic phase.Работа была выполнена при поддержке Государственного контракта Ур-ФУ №_1362

MAGNETIC PROPERTIES AND MAGNETOCALORIC EFFECT OF Ho(Me0.84Fe0.16)2 COMPOUND, WHERE Me = Co, Ni

For a more detailed study of the effect of the 3d sublattice on the magnetic and magnetocaloric properties of compounds R(Сo-Fe)2, where R = Dy, Ho, Er, with a plate-like dependence ΔSm(Т), a series of Ho(Me0.84Fe0.16)2 samples, where Me = Co, CoNi и Ni, was synthesized and studied in this paper.Работа выполнена при поддержке Государственного контракта FEUZ 2023-0020 между УрФУ и Министерством высшего образования РФ

Superhard Phases of Simple Substances and Binary Compounds of the B-C-N-O System: from Diamond to the Latest Results (a Review)

The basic known and hypothetic one- and two-element phases of the B-C-N-O system (both superhard phases having diamond and boron structures and precursors to synthesize them) are described. The attention has been given to the structure, basic mechanical properties, and methods to identify and characterize the materials. For some phases that have been recently described in the literature the synthesis conditions at high pressures and temperatures are indicated.Comment: Review on superhard B-C-N-O phase

Iron deficiency anemia in pregnant women

Introduction The problem of iron deficiency anemia (IDA), especially in pregnant women, continues to be relevant. Despite the achieved methods of diagnosis and treatment, the number of pregnant women with IDA continues to grow. Thus, according to WHO 2020 data, the prevalence of anemia among women of reproductive age ranged from 9.1 % in Australia to 69.6 % in Yemen. The aim of the work was to determination of the current state of the problem of IDA in pregnant women. Materials and methods Original articles, randomized clinical trials, and meta-analyses were reviewed in the Scopus database, PubMed and the eLibrary platform, using the key words “iron”, “oral”, “intravenous iron”, “intravenous iron therapy”, “pregnancy”, “anemia”, “treatment”, “randomized control trial”, “anemia in pregnancy”, “treatment of anemia in pregnancy”, “intravenous iron in pregnancy”, “IDA complications for mother and fetus”. The depth of the search was 5 years. Results and discussion There are different views on the classification and diagnosis of IDA in the guidelines of professional organizations. According to most guidelines hemoglobin and ferritin levels are the most reliable tests for the verification and prediction of IDA. Despite the fact that the peculiarities of the pathogenesis and approaches to the treatment of IDA have been studied, its prevalence among women remains very high. The reasons for this lie in inadequate diagnosis and incomplete therapy in terms of its duration and drugs selection. The methods of diagnosis and treatment of IDA are currently being actively studied and improved in anticipation of obtaining the greatest benefits. Conclusion Complications of IDA in the third trimester for newborns are the development of anemia, impaired development of the nervous system and cognitive disorders, which requires active prevention in the second trimester using, among other things, parenteral iron preparations.Введение. Проблема железодефицитной анемии (ЖДА), особенно у беременных, продолжает оставаться актуальной. Несмотря на достижения в разработке методов диагностики и лечения, число беременных с ЖДА продолжает расти. Так, по данным ВОЗ за 2020 г. распространенность анемии среди женщин репродуктивного возраста варьировала от 9,1 % в Австралии до 69,6 % в Йемене. Цель работы − определение современного состояния проблемы ЖДА у беременных на основе анализа литературы. Материалы и методы. Отобраны оригинальные статьи, рандомизированные клинические исследования и мета-анализы. Подбор источников осуществлен в базах данных Scopus, PubMed по поисковым словам: iron, oral, intravenous iron, intravenous iron therapy, pregnancy, anemia, treatment, randomized control trial, anemia in pregnancy, treatment of anemia in pregnancy, intravenous iron in pregnancy; и на платформе eLibrary по поисковым словам: железо, пероральный прием, внутривенное железо, внутривенная терапия железом, беременность, анемия, лечение, рандомизированное контрольное исследование, анемия во время беременности, лечение анемии во время беременности, внутривенное введение железа во время беременности, осложнения ЖДА для матери и плода. Глубина поиска – 5 лет. Результаты и обсуждение. Имеются разные точки зрения на классификацию и диагностику ЖДА в руководствах профессиональных организаций. По мнению большинства руководств наиболее достоверными для верификации и предикции ЖДА являются определение уровня гемоглобина и ферритина. Несмотря на то, что в настоящее время изучены особенности патогенеза и подходы к лечению ЖДА, ее распространенность среди женщин остается очень высокой. Причины этого кроются в недостаточной диагностике и неполноценной терапии с точки зрения ее продолжительности и выбора препарата. Методы диагностики и лечения ЖДА в настоящее время активно изучаются и совершенствуются в ожидании получения наибольших преимуществ. Заключение. Осложнениями ЖДА в третьем триместре для новорожденных являются развитие анемии, нарушение развития нервной системы и когнитивные расстройства, что требует активной профилактики во втором триместре с использованием, в том числе, и парентеральных препаратов железа