622 research outputs found
Stability and oscillations of singularly perturbed phase synchronization systems with distributed parameters
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Dichotomy and stability of disturbed systems with periodic nonlinearities
Get PDFSystems that can be decomposed as feedback interconnections of stable linear blocks and periodic nonlinearities arise in many physical and engineering applications. The relevant models e.g. describe oscillations of a viscously damped pendulum, synchronization circuits (phase, frequency and delay locked loops) and networks of coupled power generators. A system with periodic nonlinearities usually has multiple equilibria (some of them being locally unstable). Many tools of classical stability and control theories fail to cope with such systems. One of the efficient methods, elaborated to deal with periodic nonlinearities, stems from the celebrated Popov method of 'integral indices', or integral quadratic constraints; this method leads, in particular, to frequency-domain criteria of the solutions' convergence, or, equivalently, global stability of the equilibria set. In this paper, we further develop Popov's method, addressing the problem of robustness of the convergence property against external disturbances that do not oscillate at infinity (allowing the system to have equilibria points). Will the forced solutions also converge to one of the equilibria points of the disturbed system? In this paper, a criterion for this type of robustness is offered.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Team Tamas Keviczk
V. BRUSOV'S LETTERS SENT TO I. BRUSOVA FROM PARIS (1909). INTRODUCTORY REMARKS, TRANSLATION AND NOTES BY NATALIA KHACHATRYAN (YEREVAN)
No full textThe author publishes a number of letters V. Brusov sent to his spouse, I. Brusova, from Paris. The correspondence provides the writer’s insight of the city, his impressions of the meetings with René Gillet, Charles Vildrac, Paul Boyer, Konstantin Balmont. He also informed his wife of fashion and hairstyle trends and attached the magazines clippings. The correspondence also reveals V. Brusov’s engagement in some remarkable events, such as aviator flights
A World-Famous Scholar (In Memory of Natalia Bazhanova)
No full textSignificance of the findings and scientific generalizations, which were made by the the leading Russian scientist of Korean Studies Natalia Bazhanova, goes far beyond the Korean issues. It is of great interest for both the expert community, and for a wide range of readers. Analysis of the political and economic development of the DPRK allowed Bazhanova highlight the characteristics of authoritarian regimes and non-market economy, and to see how they affect the foreign policy and international relations. Natalia Evgen'evna has made a great contribution to the development of historical science. She was the first who introduced into scientific use unique documents on the history of the Korean War of 1950-1953, allowing to understand the causes, course and consequences of the conflict. Bajanova proved itself as a political scientist, analyzing and forecasting the development of the international situation on the Korean Peninsula, making constructive proposals aimed at resolving the North Korean nuclear problem. The works of Bazhanova dedicated to Russian-Korean relations are very significant. Her conclusions on the current development of relations between our two countries are especially valuable, as well as on international multilateral cooperation in the matter of a Korean settlement. Natalia Evgen'evna was the author of monograph, publicistic books and papers devoted to the many countries of the world, including the United States, France, Italy, China. She put her exceptional talent to the study of these topics. The works of Bazhanova characterized by internal logic, depth and light, have “transparent” style of presentation
On the Sources for the “Life of Alexander of Svir”: The Chapter “About the Person Who Wrote the Life of the Saint”
No full textThe article analyzes the literary sources of the “Life of Alexander of Svir,” which was written by Hegumen Herodion of Svir. The discovery of new sources significantly expands the methodological possibilities of studying this literary monument. Knowing which text the medieval author reworked, we can reveal and describe those changes which were made by the author in the adaptation of the borrowed texts. In addition, knowing which circle of sources the author borrowed from, we can come to a conclusion concerning the result that the author sought. The study shows that the final chapter, with autobiographical information on the hagiographer’s life, was compiled on the basis of three sources: “The Life of Theodosius of Kiev,” “The Life of Nikon of Radonezh,” and the epilogue of scribe Athanasius to “Oko tserkovnoe.” The first of these sources was pointed out by I. Yakhontov (1881), but the borrowings from this source that are found in the final chapter of “The Life of Alexander of Svir” have still not been studied. The other two sources are revealed for the first time. Yakhontov concluded that Herodion used in his work the lives of Russian venerables and monastery founders, mainly the works of Pachomius the Serb. Now we have reason to believe that Alexander of Svir’s hagiographer was not ruled only by patriotic or genre considerations, and that he was not an imitator of Pachomius. As far as we can tell, the choice of the source was motivated by a specific literary purpose and by each separate episode, the description of which he created on the basis of the texts of his predecessors. (The examination of these motives, however, are beyond the scope of this article.) The texts of all of the sources known to date (especially those sources which were unchanged when they were included in the “Life” of the saint) can be used as a control element in the comparison of the copies of the literary monument and in the construction of a stemma codicum
The Life of Efrem Perekomsky: Issues on the Archetype of the Monument and Its Literary Sources
Get PDFOne of the crucial problems of studying the Life of Efrem Perekomsky is the establishment of its original text. The article compares two manuscripts of the Life containing descriptions of miracles and their literary sources. As a result of the analysis, it turns out that in a more complete and preserved form, borrowings from the Life of Alexander of Svir are read in the manuscript OIDR 45, and in the manuscript RGIA published by M.A. Fedotova they are either shortened or distorted. The manuscript OIDR 45 also contains borrowings from the “Serbian” miracle of Nicholas of Myra and an earlier miracle of Efrem Perekomsky, even though they are not in the manuscript RGIA. The article concludes that contrary to the prevalent opinion, the original text of Life as a whole is better preserved in the manuscript OIDR 45. It also considers the question of the time of the creation of the Life. Inconsistencies in the chronological readings of sources are proposed to be explained using the following assumptions: The Life was written by an unknown author in the 1670s (before 1687) and completed by another unknown author in the 1710s (between 1711 and 1718); an indication of the authorship of Abbot Roman, a disciple of Efrem, was introduced into the text at the time of its creation under the influence of a literary sample (the Life of Alexander of Svir); the authorship of the Life was attributed to a disciple of Efrem Roman to give the composition greater antiquity and greater authority
Regulation of the fast fashion industry in EU law
No full textBakalářská práce se zabývá fenoménem rychlé módy (fast fashion) a jeho regulací v právu Evropské unie. Fast fashion představuje dynamicky se rozvíjející segment oděvního průmyslu, který zásadně ovlivňuje spotřebitelské chování, ekonomiku i životní prostředí. Výroba levného a snadno dostupného oblečení je spojena s nadměrnou spotřebou přírodních zdrojů, znečištěním vody a ovzduší, produkcí obrovského množství odpadu a závažnými sociálními problémy, včetně vykořisťování pracovníků a porušování lidských práv. Práce analyzuje stávající právní úpravu EU v oblasti fast fashion, přičemž zjišťuje, že aktuální legislativa se zaměřuje především na environmentální aspekty (například nařízení o ekodesignu a směrnice o odpadech), zatímco sociální dopady zůstávají často opomíjeny. Komparativní analýza přístupů EU a USA odhaluje rozdíly v míře centralizace a důrazu na udržitelnost. Na základě smíšeného výzkumu, zahrnujícího literární rešerši, případové studie a analýzu právních předpisů, je pak navržena úprava a doplnění stávající regulace EU. Doporučena je pak také kombinace tzv. hard law a soft law. Klíčovými pilíři úprav regulace jsou zvýšení transparentnosti, zlepšení pracovních podmínek a motivace firem k udržitelnějším a etičtějším obchodním praktikám. Práce zdůrazňuje nutnost komplexního přístupu, který by reflektoval jak ekologické, tak sociální aspekty tohoto globálního fenoménu.The bachelor thesis deals with the phenomenon of fast fashion and its regulation in European Union law. Fast fashion represents a dynamically developing segment of the clothing industry, has a significant impact on consumer behaviour, the economy and the environment. The production of cheap and easily available clothing is associated with excessive consumption of natural resources, water and air pollution, the generation of huge amounts of waste and serious social problems, including the exploitation of workers and human rights violations. The paper analyses existing EU legislation on fast fashion, finding that current legislation focuses mainly on environmental aspects (e.g. the Ecodesign Regulation and the Waste Directive), while social impacts are often neglected. A comparative analysis of EU and US approaches reveals differences in the degree of centralisation and emphasis on sustainability. Based on a mixed research approach including literature search, case studies and regulatory analysis, a modification and supplementation of the existing EU regulation is proposed. A combination of hard law and soft law is also recommended. The thesis highlights the need for a comprehensive approach that reflects both the environmental and social aspects of this global phenomenon
Construcción de la memoria audiovisual del libro 'Ecos Visuales': exploración y representación de la obra artística de la autora Natalia Campo
No full textEl presente documento expone el trabajo de grado titulado "Memoria audiovisual Ecos Visuales", realizado bajo la modalidad de pasantía de creación en la Universidad Autónoma de Occidente. Los responsables de esta investigación son los estudiantes Juan Pablo Hernández Triviño, Juan David Luna Peña y Juan Esteban Rivera Valderrama, pertenecientes al programa de Cine y Comunicación Digital. La esencia de este proyecto se centra en la creación de una memoria audiovisual a partir de la obra de la autora Natalia Campo Castro, titulada "Ecos Visuales". El propósito de esta iniciativa es rendir homenaje al proceso tanto creativo como personal, experimentado por la autora. Alejándose de las narrativas tradicionales y explorando nuevas formas de expresión, este trabajo finalmente abarca de manera integral el desarrollo y la justificación de la propuesta, detallando cada fase del proyecto, desde la preproducción hasta la producción y postproducción. Esta memoria audiovisual tiene como objetivo dar forma en formato de cortometraje a todo el proceso vivido, destacando el libro y evidenciándose para que perdure en la memoria de quienes tengan el privilegio de contemplarloThis document presents the graduate work entitled "Memoria audiovisual Ecos Visuales", carried out under the modality of creative internship at the Universidad Autónoma de Occidente. The students responsible for this research are Juan Pablo Hernández Triviño, Juan David Luna Peña and Juan Esteban Rivera Valderrama, from the “Cine y comunicación Digital” program. The essence of this project focuses on the creation of an audiovisual memory based on the work of the author Natalia Campo Castro, entitled "Ecos Visuales". The purpose of this initiative is to pay tribute to the creative and personal process experienced by the author. Moving away from traditional narratives, exploring
new forms of expression. This work finally comprehensively covers the development and justification of the proposal, detailing each phase of the project, from pre-production to production and post-production. This audiovisual memory aims to give shape in short film format to the whole process, highlighting the book and making it evident so that it will last in the memory of those who have the privilege of contemplating itProyecto de grado (Profesional en Cine y Comunicación Digital)-- Universidad Autónoma de Occidente, 2024PregradoProfesional en Cine y Comunicación Digita
Projeto de Para-sol com Embalagens Tetra Pak
Get PDFA reutilização das embalagens tetra pak, como uma barreira física para conter a entrada da luz solar direta no interior de veículos, vem ao encontro de dois benefícios, o primeiro deles seria, como mais um meio de reciclar as embalagens tetra pak, ou melhor dizendo, aumentar o ciclo de vida do produto, antes de ser descartado. E o segundo benefício, seria bloquear a ação da radiação ultravioleta e infravermelho no interior dos veículos que acelera a desagregação de cor dos materiais, reduzindo a vida útil dos componentes internos. A título de curiosidade, estes componentes internos, que na maioria das vezes são de cor preta, aumenta a temperatura interna do veículo, quando exposto ao sol, chegando a 80°C, devido ao efeito estufa criado, pela reflexão dos raios infravermelhos do painel e tecidos dos bancos, refletindo no vidro, quando é impedido de sair, causando um desconforto térmico aos usuários. Sendo, portanto, uma solução de custo baixo e excelente benefício à aplicação do para-sol com embalagens de tetra pak
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