6,221 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
Tsypkin and Jury–Lee Criteria for Synchronization and Stability of Discrete-Time Multiagent Systems
No full textStability of continuous-time consensus algorithms for switching networks with bidirectional interaction
No full textCompetetive exclusion in Cladocera through elevated mortality of adults
No full textThe population dynamics of two cladocerans, Ceriodaphnia pulchella and Diaphanosoma brachyurum competing under laboratory conditions in lake water was analysed using crosscorrelations. Both mixed and isolated populations of the two cladocerans showed delayed density dependence in the death rates of juveniles and adults as well as in fecundity rate. The regressions for each of the three rates on total density of competitors were compared between the two species. There were no significant differences in the slopes of regressions for fecundity rates and the death rates of juveniles. However, in the inferior competitor (Diaphanosoma) which went extinct in all treatments, the death rate of adults increased with total density much more quickly than in the superior competitor (Ceriodaphnia). The intraspecific comparisons indicated that while Ceriodaphnia adults survived better than juveniles under conditions of crowding, in Diaphanosoma, juveniles were better survivors than adults. These data suggest that the contention of higher vulnerability of cladoceran juveniles than adults to starvation and crowding may prove to be not a universal phenomenon
Utaennaja ljubov' M.N. Murav'eva
No full textL'immagine letteraria e pubblica del poeta e pedagogo M. N: Murav'ev (1757-1807) generalmenet evoca la serenità dell'amore coniugale e paterno e anche la sua lirica erotica è generalmente considerata un esercizio letterario più che l'espressione di un sentimento autentico. L'articolo presenta una breve serie di poesie inedite dedicate a una fanciulla di nome Aleksandrina e alcune lettere inedite che rivelano l'identità della destinataria.M. N. Muravyov’s image is generally associated with quiet family life and even his love poems are regarded more as literary exercises than expressions of his genuine feelings. The article presents a short series of unpublished poems dedicated to a young girl named Alexandrina and some unpublished letters that reveal the real identity of their addressee
Identification of clouds and aurorae in optical data images
No full textIn this paper we present an automatic image recognition technique used to identify clouds and aurorae in digital images, taken with a CCD all-sky imager. The image recognition algorithm uses image segmentation to generate a binary block object image. Object analysis is then performed on the binary block image, the results of which are used to assess whether clouds, aurorae and stars are present in the original image. The need for such an algorithm arises because the optical study of particle precipitation into the Earth's atmosphere by the Ionosphere and Radio Propagation Group at Lancaster generates vast data-sets, over 25 000 images/year, making manual classification of all the images impractical
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
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