Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

Review is dedicated studies of phase equilibria in the systems based on rare earth elements and 3d transition metals. It’s highlighted several structural families of these compounds and is shown that many were found interesting properties for practical application, such as high conductivity up to the superconducting state, magnetic properties, catalytic activity of the processes of afterburning of exhaust gases, the high mobility in the oxygen sublattice and more

Phase equilibria, crystal structure and oxygen content of intermediate phases in the Y-Ba-Co-O system

The phase equilibria in the Y-Ba-Co-O system were systematically studied at 1373 K in air. The intermediate phases formed in the Y-Ba-Co-O system at 1373 K in air were: YBaCo2O5+δ, YBaCo4O 7 and BaCo1-yYyO3-δ (0.09≤y≤0.42). It was shown that YBaCo2O5+δ possesses tetragonal structure with the 3ap×3a p×2ap superstructure (sp. gr. P4/mmm). High-temperature X-ray diffraction analysis of the YBaCo2O 5+δ in the temperature range from 298 K up to 1073 K under Po2=0.21 atm has not shown any phase transformations. The value of oxygen content for the YBaCo2O5+δ at room temperature was estimated as 5.40 and at 1323 K it was equal to 5.04. Thermal expansion of sample shows a linear characteristics and the average thermal expansion coefficient (TEC) is about 13.8×10-6, K-1 in the temperature range 298-1273 K. The homogeneity range and crystal structure of the BaCo1-yYyO3-δ (0.09≤y≤0.42) solid solutions were determined by X-ray diffraction of quenched samples. All BaCo1-yYyO3-δ solid solutions were found to have cubic structure (sp. gr. Pm3m). The unit cell parameters were refined using Rietveld full-profile analysis. Oxygen nonstoichiometry of BaCo 1-yYyO3-δ solid solutions with 0.1≤y≤0.4 was measured by means of thermogravimetric technique within the temperature range 298-1373 K in air. Thermal expansion of BaCo 1-yYyO3-δ (y=0.0; 0.1; 0.2; 0.3) samples was studied within the temperature range 298-1200 K in air. The projection of isothermal-isobaric phase diagram for the Y-Ba-Co-O system to the compositional triangle of metallic components was presented. © 2013 Elsevier Inc

Family status of patients with chronic kidney disease as a factor of psychological adaptation to programmatic hemodialysis

Currently, in the world a large number of people with completely lost kidney function, chronic kidney disease 4-5 stage (CKD) continues to live thanks to extracorporeal methods of detoxification. Psychological adaptation to hemodialysis conditioned by a combination of a number of subjective factors, one of which is the patient's family. The quality of family relationships, adequate psychological responses of relatives to the disease and the duration of treatment with hemodialysis contribute to the formation of patients' focus on achieving a positive result of therapy, improving wellbeing and developing positive motivation. The study identified four groups of patients with different family status and family relationships. In family patients, whose relatives took an active part in the treatment process, as well as in single patients adaptation was more successful on medical indicators. At the same time, a group of single patients showed a positive result, both on medical and psychological indicators. The least successful adaptation takes place in patients who have survived a divorce due to the disease, as well as in patients who do not have family support according to subjective ideasВ мире в настоящее время большое количество людей с полностью утраченной функцией почек, хронической болезнью почек (ХБП) 4-5 стадии продолжает жить благодаря экстракорпоральным методам детоксикации. Психологическая адаптация к гемодиализу (ГД) обусловлена совокупностью ряда субъективных факторов, одним из которых является семья пациента. Качество семейных отношений, адекватные психологические реакции родственников на заболевание и длительность лечения гемодиализом способствуют формированию у пациентов направленности на достижение положительного результата терапии, улучшение самочувствия и развитие позитивной мотивации. В результате исследования были выявлены четыре группы пациентов с разным семейным статусом и характером семейных отношений. У семейных пациентов, родственники которых принимали активное участие в лечебном процессе, а также у одиноких пациентов адаптация проходила успешнее по медицинским показателям. При этом группа одиноких пациентов выявила положительный результат как по медицинским, так и по психологическим показателям. Наименее успешно адаптация проходит у пациентов, переживших развод в связи с заболеванием, а также у пациентов, не имеющих поддержку в семье по их субъективным представления

Ensuring resilience and agility of complex organizational-technical systems

Modern organizational and technical systems have been developing in an environment that is marked by capriciousness, uncertainty, risk, variability, and evolution (CURVE factors). As organizational-technical systems grow bigger, their internal complexity increases, too, both structurally and dynamically. The article substantiates the appropriateness of employing the principles of systems engineering for managing such systems. The authors analyzed various theoretical concepts of and practice-based approaches to the development of systems engineering in the context of ensuring the resilience and agility of complex organizational-technical systems. Using the case of power engineering and hi-tech industries, the authors show that for organizations that operate critical infrastructure facilities it is essential to make sure that the system stays functional in adverse conditions and is able to recover quickly after a failure. It is demonstrated that for addressing the above task it is critical to use instruments that nurture interdisciplinary competences in individual professionals and in teams that manage the development of complex systems and implement major innovation projects. As part of the study, the authors also look at the possibility of using the principles of resilient systems design and the fundamental principles for agile systems engineering when managing critical infrastructure facilities. © 2018 WIT Press.ACKNOWLEDGEMENTS The work was supported by Act 211 of the Government of the Russian Federation, contract No. 02.A03.21.0006

Phase equilibria, crystal structure and oxygen nonstoichiometry of the complex oxides in Sm – (Sr, Ba) – (Co, Fe) – O systems

Received: 18.01.2018. Accepted: 14.02.2018. Published: 10.05.2018.Present paper contains available information on the phase equilibria in the Sm – (Sr, Ba) – (Co, Fe) – O systems, including the synthesis routes used, crystal structure, which is often depended on oxygen nonstoichiometry, the data on thermodynamic stability of complex oxides, the obtained results on the homogeneity ranges of solid solutions, formed in the systems, and graphical presentation of phase relations in a form of phase diagrams

Bicuspid aortic valve and sport

Objective: to evaluate the clinical manifestations of the pathology of the aortic valve in athletes of the initial stage of sports training and to analyze the literature data on the admission of persons with bicuspid aortic valve to training and competition. Materials and methods: 5000 athletes of the initial stage of sports training at the age of 10-12 years were examined. Examination of athletes included electrocardiography at rest and exercise, echocardiography and Holter monitoring. Anatomical features of the aortic valves were revealed in 7 (0.14%) athletes: 6 (0.12%) athletes with bicuspid aortic valve, 1 athlete (0.02%) with quadrileaflet aortic valve. The literature review included analysis of publications on the subject from two electronic library databases: Elibrary and PubMed. Results: conducted studies did not confirm the assumption of dilatation of the ascending aorta under the influence of intense physical exertion in athletes with the pathology of the aortic valve. The analysis of publications showed contradictory opinions of the researchers. Conclusions: the clinical cases, literature data, as well as the official recommendations of the American Heart Association and the American College of Cardiologists (2015) on admission of patients with aortic diseases to sports and competitions showed that in the absence of significant hemodynamic disturbances, dilatation of left ventricle and aorta root with normal ECG parameters and tolerance to physical activity, patients with bicuspid aortic valve could be allowed to exercise without restriction. However, these athletes must be under strict dynamic control of the heart

LONG-LIVED BONE MARROW PLASMA CELLS DURING IMMUNE RESPONSE TO ALPHA (1→3) DEXTRAN

Production kinetics and some functional properties of long-lived marrow plasma cells were studied in mice immunized with T-independent type 2 antigens. Alpha (1→3) dextran was used as an antigen for immunization. The mice were immunized by dextran, and the numbers of IgM antibody producing cells were determined by ELISPOT method. The cell phenotype was determined by cytofluorimetric technique. In the area of normal bone marrow lymphocytes ~4% of T and ~85% of B cells were detected. About 35% of the cells expressed a plasmocyte marker (CD138); 3% were CD138+IgM+, and about 6% of the lymphocytes were double-positive for CD138+IgA+. Among spleen lymphocytes, 50% of T and 47% of B cells were detected. About 1.5% lymphocytes were CD138+, and 0.5% were positive for CD138 and IgM. Time kinetics of antibody-producing cells in bone marrow and spleen was different. In spleen populations, the peak amounts of antibody-secreting cells have been shown on the day 4; the process abated by the day 28. Vice versa, the numbers of the antibody-producing cells in bone marrow started to increase on the day 4. The process reached its maximum on day 14, and after 28th day became stationary. The in vitro experiments have shown that supplementation of bone marrow cells from immune mice with dextran did not influence their functional activity. It was previously shown for cells responding to T-dependent antigens only. A specific marker for the long-lived plasma cells is still unknown. However, these cells possess a common CD138 marker specific for all plasma cells. A method for isolation of bone marrow CD138+ cells was developed. The CD138+ cells were of 87-97% purity, being enriched in long-lived bone marrow cells, and produced monospecific antibodies

Preparation, crystal structure and properties of HoBaCo 2-xFexO5+δ

A series of samples of overall composition HoBaCo2-xFe xO5+δ with 0.0 ≤ x ≤ 0.8 were prepared by glycerin nitrate technique in air and in pure oxygen. Irrespective of atmosphere used the homogeneity range of single phase iron substituted holmium barium cobaltate was proved to exist within the range 0.0 ≤ x ≤ 0.4. All samples prepared in air and samples within the compositional range 0.2 ≤ x ≤ 0.4 obtained in oxygen possess tetragonal ap × ap × 2ap (sp. gr. 4/mmm) structure. HoBaCo2O 5+δ and HoBaCo1.9Fe0.1O 5+δ synthesized in oxygen crystallized in orthorhombic a p × 2ap × 2ap (sp. gr. mmm) structure. The structural parameters were refined by the Rietveld analysis. It was shown that parameter a remains practically constant while parameter c gradually increases with the increase of iron content. The changes of oxygen content in HoBaCo2-xFexO5+δ (x = 0, 0.2, 0.4) were measured by TGA within the temperature range 25-1100 °C in air. The absolute value of oxygen content was determined by the reduction of the samples in hydrogen flow. The influence of oxygen and iron content on the crystal structure has been discussed. The chemical stability of HoBaCo 2-xFexO5+δ in contact with the solid electrolyte materials Ce0.8Sm0.2O2 and Zr 0.85Y0.15O2 was examined. © 2013 Elsevier Ltd