328,567 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 textTwo-sided asymptotic bounds for the complexity of some closed hyperbolic three-manifolds
No full textWe establish two-sided bounds for the complexity of two infinite series of closed orientable 3-dimensional hyperbolic manifolds, the Lobell manifolds and the Fibonacci manifolds
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Stability of continuous-time consensus algorithms for switching networks with bidirectional interaction
No full textThermoacoustic 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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