Calculation of an unsteady jet flow around the plate cascade

In the framework of the general theory for unsteady weakly disturbed fluid flows with free boundaries, a problem is solved to calculate a jet flow around the cascade of plates executing the harmonic oscillations. We developed a program that enables us for the first time to carry out systematic calculations of flow characteristics depending on arbitrary values of determining parameters. © Allerton Press, Inc. 2009

Estimating the First-year Corrosion Losses of Structural Metals for Continental Regions of the World

The knowledge of the first-year corrosion losses of metals (K1) in various regions of the world is of great importance in engineering applications. The K1 values are used to determine the categories of atmospheric corrosivity, and K1 is also the main parameter in models for the prediction of long-term corrosion losses of metals. In the absence of experimental values of K1, their values can be predicted on the basis of meteorological and aerochemical parameters of the atmosphere using the dose-response functions (DRF). Currently, the DRFs presented in ISO 9223:2012(E) /1/ standard are used for predicting K1 in any region of the world, along with the unified DRFs /2/ and the new DRFs /3/. The predicted values of corrosion losses (K1pr) of carbon steel, zinc, copper and aluminum obtained by various DRFs for various continental regions of the world are presented. In this work we used the atmosphere corrosivity parameters and experimental data on the corrosion losses of metals for the first year of exposure (K1exp) for the locations of the tests performed under the international UN/ECE program, the MICAT project, and the Russian program. For the first time, a comparative assessment of the reliability of various DRFs is given by comparing the values of K1pr and K1ex using graphical and statistical methods. The statistical indicators of reliability of predicting the corrosion losses of metals are calculated for various categories of atmosphere corrosivity. It is shown that the new dose-response functions offer the highest reliability for all categories of atmosphere corrosivity

Thermoelectric prospects of nanomaterials with spin-orbit surface bands

Nanostructured composites and nanowire arrays of traditional thermoelectrics like Bi, Bi(1-x)Sb(x) and Bi(2)Te(3) have metallic Rashba surface spin-orbit bands featuring high mobilities rivaling that of the bulk for which topological insulator behavior has been proposed. Nearly pure surface electronic transport has been observed at low temperatures in Bi nanowires with diameter around the critical diameter, 50 nm, for the semimetal-to semiconductor transition. The surface contributes strongly to the thermopower, actually dominating for temperatures T < 100 K in these nanowires. The surface thermopower was found to be -1 T microvolt/(K^2), a value that is consistent with theory. We show that surface electronic transport together with boundary phonon scattering leads to enhanced thermoelectric performance at low temperatures of Bi nanowire arrays. We compare with bulk n-BiSb alloys, optimized CsBi(4)Te(6) and optimized Bi(2)Te(3). Surface dominated electronic transport can be expected in nanomaterials of the other traditional thermoelectrics.Comment: 18 pages, 3 figure

Russian-Polish Relations at the Turn of the “Long XII Century”: from the “Pereyaslavl Crisis” to the Death of Roman Galitsky

This article is a continuation of the work “The Polish Vector in the Politics of Vladimir Monomakh and His  Successors: from the Lyubech Congress to the “Pereyaslavl Crisis”, published in the previous issue. The question of the system of Russian-Polish relations during the period of the onset of political fragmentation of Russia (since 1132) and a radical change in the balance of power relative to the Kiev principality is considered in the article. It is proved that the thesis of the religious factor as decisive in Russian-Polish relations does not correspond to the realities of the 30—90s of the 12th century. It is shown that the internal and external political circumstances of the 30—40s of the XII century forced Kiev and Krakow to come closer. It is emphasized that the trend towards rapprochement continues throughout the second half of the 12th century. Particular attention is paid to the nature  of Russian-Polish relations at the turn of the XII-XIII centuries. The authors note that the situation in Russian-Polish relations begins to change dramatically in the first decade of the 13th century. Evidence is given that the reasons for the cardinal changes were associated with the political course of the Galician-Volyn prince Roman Mstislavich and the results of the IV Crusade, which marked the beginning of the civilizational split in Europe

Teaching religion and classical languages in Russian gymnasiums in the middle of XIX - Beginning of the XX century: Searching for a harmonic correlation

© Serials Publications. The article deals with the situation formed during the period of reforming the secondary education system in the Russian Empire (mid XIX - beginning of the XX century), concerning studying the bases of religion in secular secondary schools, as well as position and significance of classical languages (Ancient Greek and Latin) in teaching Russian gymnasium students. Both of them were subject to pedagogic and public discussions throughout the mentioned period, and still they remain debatable nowadays. Based on the information available in the sources and literature on the Russian secondary school history, the main contradictions of two components ("religious" and "antique") are revealed in the context of a paradigm of classic school education, and also under conditions of isolation of various types of secondary professional schools ("real" gymnasiums and colleges) from classic gymnasiums in the second half of the XIX century. The authors propound conclusions on the reasons behind the contradictions in this particular field and characterize the points of view of the researchers of the problem. Materials of the article are useful for researchers of history of education, philologists, theologies, practicing teachers, and also for participants of modern public and pedagogical discussions concerning educational policy and forming of a new school paradigm

Polish Vector in Politics of Vladimir Monomakh and His Heirs: from the Lyubech Congress to the “Pereyaslavl Crisis”

The question of the system of Russian-Polish interaction during the period of temporary stabilization of political relations in Russia - from the Lyubech Congress (1097) to the end of the Kiev reign of Mstislav the Great (1125-1132) is considered in the article. The authors show that the 12th century is presented in historiography as a time of gradual growth of contradictions between two Christian civilizations, as a transitional period between the Great Schism of 1054 and the IV Crusade (1202- 1204). An attempt is made to consider the relationship between Russia and Poland of the indicated period outside the teleological approach. The authors provide evidence that the thesis of the religious factor as decisive in Russian-Polish relations does not correspond to the political realities of the 10- 30s of the XII century. It is shown that it was the ideological orientation of Vladimir Monomakh towards the crusading movement and the Holy Roman Empire that made it impossible for allied relations between Kiev and Krakow in the first quarter of the 12th century. It has been proved that there was no single policy of Rus towards Poland; the actions of the two sides were situational. The authors come to the conclusion that in Russia and Poland, competing political groups sought to implement their own strategies in relation to the neighboring state

Delivery features of pregnant women with a uterine scar

Vaginal delivery after a Caesarean section remains a controversial topic: there is a lack of reliable data to help doctors and women in labour to determine the best option for delivery during subsequent pregnancy. The review analyzed and summarized the results of the studies devoted to childbirth of pregnant women with scars on the uterus, considered the advantages and disadvantages of vaginal childbirth and repeat Caesarean section, the frequency of complications in the attempt of vaginal childbirth in women with scars on the uterus has been assessed. The modern medical literature available in open sources has been studied: Russian-language scientifc electronic libraries eLibrary and CyberLeninka, Englishlanguage database of medical and biological publications PubMed. It is necessary to consider the data of anamnesis and clinical-instrumental data when choosing the best management tactics of pregnancy and delivery for women with scars on the uterus. Attempting to deliver vaginally helps to reduce maternal and neonatal morbidity, and a large number of studies on this issue should help to reduce the number of unwarranted repeat Caesarean sections. Vaginal delivery after a Caesarean section is an opportunity to avoid severe abdominal surgery and negative consequences associated with repeated Caesarean sections