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

Notes to the profile of modern student

Мировоззрение студентов, их ценности меняются в зависимости от социально-экономических условий, которые в свою очередь подвержены историческим изменениям. В статье описаны особенности ценностных ориентаций, профессиональной самооценки современного студента, выпускника. Полученные результаты могут служить отправной точкой для проектирования образовательной среды внутри образовательной организации.Students’ world-view and values change depending on socioeconomic conditions, which are influenced by some historical changes. The article shows peculiarities of value orientations, professional self-appraisal of modern graduate. The results of this research may be used as a starting point for projecting of educational environment inside educational organization

Crystal structure and oxygen nonstoichiometry of oxides in the Ba-Me-Me’-Y-O (Me, Me’=Co, Fe) system

Polycrystalline BaМe1-xYxO3-δ(Me=Co, Fe) samples were synthesized by a conventional route and glycerol-nitrate technique. According XRD patterns of single phase solid solutions BaCo1-xYxO3-δ (0.1≤x≤0.4) and BaFe0.9-yY0.1CoyO3-δ (0.05≤y≤0.15) were indexed using Pm3m space group. The unit cell parameters were refined using Rietveld full-profile analysis. Oxygen non-stoichiometry of these solid solutions was measured by means of thermogravimetric technique within the temperature range 298-1273 K in air.The work was supported under financial support from RFBR № 13-03-00958 and Ministry of Science and Education of Russian Federation within the limits of the Federal target program "Scientific and scienceeducational cadres of innovative Russia for 2009-2013"

Transforming the Productivity of People in the Built Environment: Emergence of a Digital Competency Management Ecosystem

This chapter explores how we create and support a digitally enabled, agile, competent, and ultimately, productive workforce and determines the key research questions that need to be addressed if Digital Built Britain (DBB) is to provide return on investment and succeed as the catalyst for evolving the manner in which we conceive, plan, design, construct, operate, and interact with the built environment. The proposed vision is a digital competency management ecosystem where interdependent stakeholders are incentivised to work together in coopetition to create, capture, infer, interpret, specify, integrate, accredit, apply, use, monitor, and evolve competence as a working (data) asset. This needs to be in a consistent, objective, explicit, and scalable manner, with end2end transparency and traceability for all stakeholders that overcome the challenges of competency management. Moreover, a core element must be an ecosystem organised around digital infrastructure of competency frameworks and other knowledge sources of competence, so that competency frameworks are in digital operation and dynamic context

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

Fatigue variation of surface properties of silumin subjected to electron-beam treatment

The analysis of structure-phase states modification of silumin subjected to electron beam treatment with the following fatigue loading up to the failure is carried out by methods of transmission electron diffraction microscopy. The tribology and strength properties of silumin surface after electron beam treatment and fatigue tests are studied and hardness decrease, wear coefficient and friction coefficient increase with the growth of cycles number are revealed. The possible reasons of the tribology and strength properties of silumin surface layers decrease are discussed

Fractography of Fatigue Fracture Surface in Silumin Subjected to Electron-Beam Processing

The surface modification of the eutectic silumin with high-intensity pulsed electron beam has been carried out. Multi-cycle fatigue tests were performed and irradiation mode made possible the increase in the silumin fatigue life more than 3.5 times was determined. Studies of the structure of the surface irradiation and surface fatigue fracture of silumin in the initial (unirradiated) state and after modification with intense pulsed electron beam were carried out by methods of scanning electron microscopy. It has been shown, that in mode of partial melting of the irradiation surface the modification process of silicon plates is accompanied by the formation of numerous large micropores along the boundary plate/matrix and microcracks located in the silicon plates. A multi-modal structure (grain size within 30-50 μm with silicon particles up to 10 [mu]m located on the boundaries) is formed in stable melting mode, as well as subgrain structure in the form of crystallization cells from 100 to 250 [mu]m in size). Formation of a multi-modal, multi-phase, submicro- and nanosize structure assisting to a significant increase in the critical length of the crack, the safety coefficient and decrease in step of cracks for loading cycle was the main cause for the increase in silumin fatigue life

Search for Optimal MRI Protocol for the Diagnosis of Vaginal Tumor

Background. A wide variety of pulse sequences, the possibility of multiplanar imaging significantly increase the capabilities of magnetic resonance imaging (MRI) in diagnosing diseases of the female reproductive system. At the same time, the lack of a regulated scanning protocol, especially in patients who have undergone anticancer treatment, requires standardization of the technique and the search for an optimal set of pulse sequences that allows to visualize the vagina throughout its entire length and to perform differential diagnosis between continued tumor growth and post-radiation changes while maintaining an adequate examination time.Objective: to determine the optimal set of MRI pulse sequences for pelvic organs examination in patients with vaginal tumors and to form an original research protocol based on diagnostic information content.Material and methods. The study included 141 patients with vaginal tumors. A comparative analysis of four MRI protocols was carried out, built according to the principle “from simple to complex” (from native to multiparametric MRI).Results. A significant difference was obtained between all information content indicators of Protocol 4 compared to Protocol 1 (sensitivity p = 0.00006, specificity p = 0.00443, AUC p = 0.00000). Data analysis also showed a significant difference between sensitivity and AUC for Protocols 2 and 4 (p = 0.00150 and p = 0.00087, respectively), and Protocols 3 and 4 (p = 0.01333 and p = 0.01333, respectively).Conclusion. Significant increase in the information content of Protocol 4 compared to other protocols (sensitivity up to 93%, specificity up to 94%, accuracy up to 93%) indicates the expediency of the priority use of multiparametric MRI in the primary diagnosis of vaginal tumor lesions

Pulse wave velocity and other indicators of arterial stiffness in hypertension comorbidity and chronic obstructive pulmonary disease

The aim is to study pulse wave velocity (PWV) and other parameters of arterial stiffness in patients with comorbid arterial hypertension (AH) and chronic obstructive pulmonary disease (COPD). Materials and methods. 32 patients with a combination of AH and COPD (group 1), 30 patients with isolated hypertension (group 2), 18 patients with isolated COPD (group 3), 30 healthy subjects (control group) were examined. Applanation tonometry and pulse wave contour analysis at the carotid-femoral segment were made by SphygmoCor (AtCor Medical). Results. Aortic systolic blood pressure in patients with the combination of hypertension and COPD was higher compared to the group of the patients with isolated hypertension by 9.83% (p=0.02), and the patients with COPD by 41.5% (p = 0.000042), respectively. Central pulse pressure in the first group was higher compared to the second group by 29.58% (p=0.00022), in the third group - by 53.4% (p=0.0029). The combination of hypertension and COPD (β=0.42, p=0.00019), age (β=0.39, p=0.0002) and the level of aortic pulse pressure (β=0.54, p=0.001) were marked as independent factors of PWV increasing according to the multiple regression analysis. Conclusion. In patients with a combination of hypertension and COPD the increase in PWV, systolic and pulse pressure in the ascending aorta was observed, compared to patients with isolated hypertension, isolated COPD and the control group during applanation tonometry

Analysis of the physical fitness of students in accordance with the norms of the All-Russian sports complex «Ready for labor and defense» with regard to somatic type

Objective: to detect the relationship between body types (somatotype) and successful passing of the standards of «Ready for Labor and Defense-2014» in students-boys of 18-20 years old. Materials and methods: the study involved 82 male students. The method of somatotyping by Dorokhov RN, Petrukhina VG (1989) was used to determine the body types. The overall and component level of variation was defined. We used the results of passing the test standards and compared them with data on the implementation of the norms of GTO in some types of tests: 100-meters race, 3000-meters race, pulling out from suspension on high bar, standing long jump using double-legged take-off. Results: the muscle mass dominates in all somatic groups, which corresponds to macromuscular type (0,509-0,799). The representatives of microsomatiс type have the highest results - 0.7. When comparing the results of tests of «pulling out from suspension on high bar» with the standards of GTO 2014 6 stage, the best results were found in microsomes group: 90.5% of the subjects completed the specification and received the gold badge, 4.8% of the subjects received the bronze badge, 4.8% of the subjects failed tasks. In mesosomes group only 60% of the subjects fulfilled the standard of «pulling-up» and received the gold badge, 33.33% of the subjects received the silver badge, 6.67% of the subjects did not fulfill the norm. While analyzing the results of «standing long jump using double-legged take-off» more successful results were obtained in the MaC group: 46.67% received the gold badge, 33.33% received the silver badge, 16.67% received the bronze badge, 3.33% did not fulfill the norm. Conclusions: assessing the anthropometric and functional parameters of the organism of students, it is necessary to consider not only the average age range, but also pay attention to the constitutional-typological features