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  • 1
    Publication Date: 2010-01-01
    Description: This paper deals with the PI control of a highly simplified dynamic model of a hydraulic cylinder. It is assumed that the hydraulic fluid is incompressible and that the pump provides constant flow rates, which results in the possibility of velocity control. Two types of anomalies are taken into account: (a) the time delay due to the controller computations and the internal pressure dynamics and (b) the dead zone of the controller valve. This results in a nonlinear system are described by a piecewise linear discontinuous map. Nonlinear behavior of the system is explored and the practically globally stable parameter domains are identified.
    Print ISSN: 1024-123X
    Electronic ISSN: 1563-5147
    Topics: Mathematics , Technology
    Published by Hindawi
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  • 2
    Publication Date: 2020-12-24
    Description: The paper presents the first results of an exploratory research work, aiming the experimental evaluation of the mechanical contact between conforming surfaces of metallic bodies. The proposed procedure—that is based on the measurement of electric potentials—is able to determine the actual contact pattern and estimate the force distribution on the opposing surfaces. In the present paper, the contact properties along a curve are evaluated, but the basic principles supporting the solution of the more general surface contact problem are also laid down. The goal of this research work is to provide a reliable basis for the investigation of contact-related effects on the modal properties of structures and machines. The distribution of electric contact resistivity can also be assessed using this method, opening the way to the refined characterization of electric switches and connectors. During the application of the method, measured electric voltage values are processed by a neural network trained on a data set generated by finite element software. The resulting electric contact conductivity distribution is used to determine the contact force distribution, taking into account the equilibrium of forces and moments. The results are also checked by available alternative experimental methods.
    Print ISSN: 0001-5970
    Electronic ISSN: 1619-6937
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 3
  • 4
    Publication Date: 2024-04-02
    Description: The unanticipated and unsolicited Russian aggression against Ukraine in February 2022 highlighted the urgency of updating general assumptions about post-communist countries. The war has revealed the inadequacy of the terms and concepts employed for western democracies for describing, understanding, and predicting the developments in the “hybrid” regimes of Eastern Europe and the former USSR. Magyar and Madlovics strongly argue for a vocabulary and grammar tailored to the specifics of the countries of the former communist bloc. In this concise companion to the 800-page The Anatomy of Post-Communist Regimes (CEU Press, 2020), they develop a conceptual framework in 120 propositions with (1) a typology of post-communist regimes and (2) a detailed presentation of ideal-type actors and the political, economic, and social phenomena in these regimes. Each of the 120 propositions contains a statement and a succinct discussion supported by illustrative tables, figures, and QR-codes that connect the interested reader to the more detailed analysis in the Anatomy. In a condensed form, the holistic approach of the Anatomy is retained by treating political, market, and communal spheres as parts of a single, coherent whole. An analysis of twelve countries illustrates the concrete application of the method.
    Keywords: History ; Europe ; Eastern ; thema EDItEUR::N History and Archaeology::NH History::NHD European history
    Language: Ukrainian
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  • 5
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    Central European University Press
    Publication Date: 2023-11-16
    Description: Offering a single, coherent framework of the political, economic, and social phenomena that characterize post-communist regimes, this is the most comprehensive work on the subject to date. Focusing on Central Europe, the post-Soviet countries and China, the study provides a systematic mapping of possible post-communist trajectories. At exploring the structural foundations of post-communist regime development, the work discusses the types of state, with an emphasis on informality and patronalism; the variety of actors in the political, economic, and communal spheres; the ways autocrats neutralize media, elections, etc. The analysis embraces the color revolutions of civil resistance (as in Georgia and in Ukraine) and the defensive mechanisms of democracy and autocracy; the evolution of corruption and the workings of “relational economy”; an analysis of China as “market-exploiting dictatorship”; the sociology of “clientage society”; and the instrumental use of ideology, with an emphasis on populism. Beyond a cataloguing of phenomena—actors, institutions, and dynamics of post-communist democracies, autocracies, and dictatorships—Magyar and Madlovics also conceptualize everything as building blocks to a larger, coherent structure: a new language for post-communist regimes. While being the most definitive book on the topic, the book is nevertheless written in an accessible style suitable for both beginners who wish to understand the logic of post-communism and scholars who are interested in original contributions to comparative regime theory. The book is equipped with QR codes that link to www.postcommunistregimes.com, which contains interactive, 3D supplementary material for teaching.
    Keywords: Political Science ; Comparative Politics ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPB Comparative politics ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPF Political ideologies::JPFC Marxism & Communism ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCP Political economy
    Language: English
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