5,112 research outputs found
“I Began Understand Piłsudski, When I Reached His Age”. Memoirs of G.F. Matveev in the Form of Interview
No full textGennady Filippovich Matveev (born in 1943), Doctor of Historical Sciences, Honored Professor of Moscow University, Head of the Department of the History of the Southern and Western Slavs of Moscow State University, one of the leading domestic specialists in the modern history of Poland, tells about his life and professional activities at the request of the editors of the journal Slavic World in the Third Millennium. Born on the banks of the Volga, G.F. Matveev spent his childhood and youth in Western Ukraine. Since 1966, his whole life has been inextricably linked with the Moscow University, where he received a diploma in history, completed his postgraduate studies, defended his candidate's and doctoral theses, and where he has been teaching for half a century and was head of the department for more than three decades. The students of G.F. Matveev completed and defended a large number of diplomas, master's and candidate's theses, they work in different cities of the country and abroad. As a historian, G.F. Matveev invariably relies on deep researches in archives, introduces a lot of new material into circulation, his innovative research on the history of the Soviet-Polish war of 1920 caused fruitful discussions both in Russia and in Poland, prompting other historians to further research. Gennady Filippovich is the author of the first fundamental biography in Russian of the key statesman of Poland of the 20th century Józef Piƚsudski. Not limited to the problems of Polish history, G.F. Matveev turned to comparative historical research on the material of various Slavic countries, in particular, on the ideology of peasant movements in the period between the two world wars. As an author and editor, he took part in the work on textbooks on the history of the southern and western Slavs. For more than half a century, G.F. Matveev maintains close ties with the Institute of Slavic Studies of the Russian Academy of Sciences, he is a member of the editorial boards of historical journals, both Russian and Polish.
G.F. Matveev talks about his post-war childhood, youth, impressions of his student years, about his work at the Moscow University, about his numerous trips to Poland and more than half a century of communication with Polish colleagues. He also shares his opinion on the current development and prospects of Polish studies in Russia, the possibilities for further dialogue between the two cultures
Replication package for "The Central Bank Strikes Back! Credibility of Monetary Policy under Fiscal Influence"
No full textThis replication package accompanies Camous A. and D. Matveev. "The Central Bank Strikes Back! Credibility of Monetary Policy under Fiscal Influence"
Variations of selective separability II: Discrete sets and the influence of convergence and maximality
No full textAbstractA space X is called selectively separable (R-separable) if for every sequence of dense subspaces (Dn:n∈ω) one can pick finite (respectively, one-point) subsets Fn⊂Dn such that ⋃n∈ωFn is dense in X. These properties are much stronger than separability, but are equivalent to it in the presence of certain convergence properties. For example, we show that every Hausdorff separable radial space is R-separable and note that neither separable sequential nor separable Whyburn spaces have to be selectively separable. A space is called d-separable if it has a dense σ-discrete subspace. We call a space X D-separable if for every sequence of dense subspaces (Dn:n∈ω) one can pick discrete subsets Fn⊂Dn such that ⋃n∈ωFn is dense in X. Although d-separable spaces are often also D-separable (this is the case, for example, with linearly ordered d-separable or stratifiable spaces), we offer three examples of countable non-D-separable spaces. It is known that d-separability is preserved by arbitrary products, and that for every X, the power Xd(X) is d-separable. We show that D-separability is not preserved even by finite products, and that for every infinite X, the power X2d(X) is not D-separable. However, for every X there is a Y such that X×Y is D-separable. Finally, we discuss selective and D-separability in the presence of maximality. For example, we show that (assuming d=c) there exists a maximal regular countable selectively separable space, and that (in ZFC) every maximal countable space is D-separable (while some of those are not selectively separable). However, no maximal space satisfies the natural game-theoretic strengthening of D-separability
Transfer of a work by e-mail: copyright aspect
No full textE-mail gives the opportunity to send a work of science, literature and art to one or more addressees. Russian copyright law does not allow us to make an unambiguous conclusion about the legitimacy of such use of a work. Purpose: to determine the legal regime of the transfer of works protected by copyright through e-mail. Methods: method of formal logic, systematic structural and formal dogmatic methods are used in the analysis. The article presents two approaches to the problem under consideration. Article 1270 of the Civil Code of the Russian Federation is devoted to the contents of the exclusive copyright. This article establishes an open list of methods to use a work. Accordingly, we can make a logically correct, but legally dubious conclusion that any emailing of a work is illegal. This logic is based on the questionable legal technique of art. 1270 of the Civil Code of the Russian Federation. The author of the paper believes that the second approach is correct. According to this approach, the content of exclusive copyright should be limited to the methods to use a work that is specified in art. 1270. Emailing of a work includes two legally significant actions with such a work: 1) the creation of an electronic copy of a work; 2) sending this copy via the information and telecommunications network as an electronic message to a specific address. The first action is the reproduction of a work. The second action is the communication to the public. The transfer of a work by e-mail is the communication to the public if access to such a work can be obtained by a significant number of persons who do not belong to the usual family circle
Thermoacoustic Instabilities in the Rijke Tube: Experiments and Modeling
No full textThermoacoustic instability can appear in thermal devices when unsteady heat release is coupled with pressure perturbations. This effect results in excitation of eigen acoustic modes of the system. These instabilities are important in various technical applications, for instance, in rocket motors and thermoacoustic engines.
A Rijke tube, representing a resonator with a mean flow and a concentrated heat source, is a convenient system for studying the fundamental physics of thermoacoustic instabilities. At certain values of the main system parameters, a loud sound is generated through a process similar to that in real-world devices prone to thermoacoustic instability. Rijke devices have been extensively employed for research purposes. The current work is intended to overcome the serious deficiencies of previous investigations with regard to estimating experimental errors and the influence of parameter variation on the results. Also, part of the objective here is to account for temperature field non-uniformity and to interpret nonlinear phenomena. The major goals of this study are to deliver accurate experimental results for the transition to instability and the scope and nature of the excited regimes, and to develop a theory that explains and predicts the effects observed.
An electrically heated, horizontally oriented, Rijke tube is used for the experimental study of transition to instability. The stability boundary is quantified as a function of major system parameters with measured uncertainties for the data collected. Hysteresis in the stability boundary is observed for certain operating regimes of the Rijke tube.
An innovative theory is developed for modeling the Rijke oscillations. First, linear theory, incorporating thermal analysis that accurately determines the properties of the modes responsible for the transition to instability, is used to predict the stability boundary. Then, a nonlinear extension of the theory is derived by introducing a hypothesis for a special form of the nonlinear heat transfer function. This nonlinear modeling is shown to predict the hysteresis phenomenon and the limit cycles observed during the tests.
A new, reduced-order modeling approach for combustion instabilities in systems with vortex shedding is derived using the developed analytical framework. A hypothesis for the vortex detachment criterion is introduced, and a kicked oscillator model is applied to produce nonlinear results characteristic for unstable combustion systems.
The experimental system and the mathematical model, developed in this work for the Rijke tube, are recommended for preliminary design and analysis of real-world thermal devices, where thermoacoustic instability is a concern.</p
PIC simulace pravoúhlých a seříznutých štěrbin ve zkušebním limiteru tokamaku TEXTOR
No full textIn this paper, we present results of Particle-In-Cell simulations of the plasma behavior in the vicinity of gaps in castellated plasma-facing components. We studied gaps in the test limiter of TEXTOR, which is a plasma-facing component designed for studies of impurity transport and fuel retention, mainly via hydrocarbon layer formation. The castellated limiter tiles have been analyzed using the postmortem techniques and first attempts of impurity transport modelling were done using the 3DGAP code [Matveev et al., 2008]. In order to improve the agreement between modeling and experiment, realistic plasma particle flux distribution needs to be included in the code. For this purpose, a series of PIC simulations for varying plasma conditions was performed by using the SPICE2 code [Dejarnac et al., 2008]. Plasma behavior inside the gaps is discussed and semi-empiric characterization via generic fitting procedure is propose
New concepts in silicon calorimetry for space experiments
No full textIn the framework of the INFN R&D project CASIS, we have designed a new double-sided silicon strip detector with parallel strips, optimised for calorimetry. The idea is to read out p and n strips with two types of electronics, having different sensitivities and ranges, in order to increase the overall dynamic range by covering different signal regions. We present results from a test beam we performed at TSL (Uppsala, Sweden) with N, O and Ne ions with energies above 40 MeV/n. The design of a new front-end integrated circuit, with ultra-large dynamic range (more than 10,000 MIP) is under way and the first prototypes will be produced by the end of 2003. (C) 2003 Elsevier B.V. All rights reserved
Vitamin D Pathway Genes, Diet, and Risk of Renal Cell Carcinoma
No full textMediated by binding to the high-affinity vitamin D receptor (VDR), vitamin D forms a heterodimer complex with the retinoid-X-receptor (RXR). Variation in both genes has been shown to modify renal cell carcinoma (RCC) risk. Therefore, we investigated whether VDR and RXRA polymorphisms modify associations between RCC risk and frequency of dietary intake of vitamin D and calcium rich foods, and occupational ultraviolet exposure among 777 RCC case and 1035 controls from Central and Eastern Europe. A positive association was observed in this population between increasing dietary intake frequency of yogurt, while an inverse association was observed with egg intake frequency. RXRA polymorphisms, located 3′
of the coding sequence, modified associations between specific vitamin D rich foods and RCC risk, while RXRA polymorphisms, located in introns 1 and 4, modified associations with specific calcium rich foods. Results suggest that variants in the RXRA gene modified the associations observed between RCC risk and calcium and vitamin D intake
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