Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 4
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

Kvitka‑Osnovyanenko was the first prose writer of the new Ukrainian literature, the conventional starting point for which is dated as 1798, when Ivan Kotlyarevsky’s Aeneid was published. In 1833‑1834, Hryhoriy Kvitka‑Osnovyanenko began to publish his stories and short novels in Ukrainian. They served as a starting point for all subsequent prose in the Ukrainian language. A structural analysis of Kvitka’s prose has shown that his method of text construction still had much in common with folk tales: texts are constructed on the basis of elemental repetitions or binary oppositions. However, the author has already started to make important semantic shifts, introducing types of characters and collisions alien to folklore text per se. Thus the effect of deautomatization of the folklore perception is reached. The meaning of some texts, which were previously considered “humorous”, in the light of what has been said, acquires a meta‑narrative meaning: A Soldier’s Portrait and The Konotop Witch, have episodes that expose their main compositional technique (‘priyom’) and demonstrate the author’s conscious play with the narrative patterns of folklore.
Go to article

Authors and Affiliations

Nazarii Nazarov
1
ORCID: ORCID

  1. Taras Shevchenko National University of Kyiv
Download PDF Download RIS Download Bibtex

Abstract

The article presents the main functions of aesthetic values (beauty, simplicity, symmetry) in the process of formulating, evaluating and accepting scientific theories in the work of physicist: 1) they motivate to undertake scientific research; (2) have a heuristic role which enables the direction of the search for a new theory to be selected; (3) are a criterion for choosing between empirically equivalent theories in the absence of empirical evidences and (4) sometimes constitute an epistemological obstacle. The basic thesis of the work is that aesthetic values, in addition to positive functions, also play a negative role in science, hindering the acceptance of new theories or leading to inefficient research. Too much weight on the aesthetic side of theory can pose a threat to the objectivity of scientific cognition.

Go to article

Authors and Affiliations

Magdalena Łata
Andrzej Łukasik
Download PDF Download RIS Download Bibtex

Abstract

It is shown how a stability test, alternative to the classical Routh test, can profitably be applied to check the presence of polynomial roots inside half-planes or even sectors of the complex plane. This result is obtained by exploiting the peculiar symmetries of the root locus in which the basic recursion of the test can be embedded. As is expected, the suggested approach proves useful for testing the stability of fractional-order systems. A pair of examples show how the method operates. It is believed that the suggested geometric approach can also be of some didactic value in introducing basic control-system tools to engineering students.
Go to article

Bibliography

[1] J.J. Anagnost, C.A. Desoer, and R.J. Minnichelli: Graphical stability robustness tests for linear time-invariant systems: Generalizations of Kharitonov’s stability theorem, Proceedings of the 27th IEEE Conference on Decision and Control (1988), 509–514.
[2] A.T. Azar, A.G. Radwan, and S.Vaidyanathan, Eds.: Mathematical Techniques of Fractional Order Systems, Elsevier, Amsterdam, The Netherlands, 2018.
[3] R. Becker, M. Sagraloff. V. Sharma, J. Xu, and C. Yap: Complexity analysis of root clustering for a complex polynomial, Proceedings of the 41th ACM International Symposium on Symbolic and Algebraic Computation, (2016), 71–78.
[4] T.A. Bickart and E.I. Jury: The Schwarz–Christoffel transformation and polynomial root clustering, IFAC Proceedings 11(1), (1978), 1171–1176.
[5] Y. Bistritz: Optimal fraction–free Routh tests for complex and real integer polynomials, IEEE Transactions on Circuits and Systems I: Regular Papers 60(9), (2013), 2453–2464.
[6] D. Casagrande, W. Krajewski, and U. Viaro: On polynomial zero exclusion from an RHP sector, Proceedings of the 23rd IEEE International Conference on Methods and Models in Automation and Robotics, (2018), 648–653.
[7] D. Casagrande, W. Krajewski, and U. Viaro: Fractional-order system forced-response decomposition and its application, In Mathematical Techniques of Fractional Order Systems, A.T. Azar, A.G. Radwan, and S. Vaidyanathan, Eds., Elsevier, Amsterdam, The Netherlands, 2018.
[8] A. Cohn: Über die Anzahl der Wurzeln einer algebraischen Gleichung in einem Kreise, Mathematische Zeitschrift 14, (1922), 110–148, DOI: 10.1007/BF01215894.
[9] Ph. Delsarte and Y. Genin: The split Levinson algorithm, IEEE Transactions on Acoustics, Speech, and Signal Processing ASSP, 34(3), (1986), 470–478.
[10] Ph. Delsarte and Y. Genin: On the splitting of classical algorithms in linear prediction theory, IEEE Transactions onAcoustics, Speech, and Signal Processing ASSP, 35(5), (1987), 645–653.
[11] A. Doria–Cerezo and M. Bodson: Root locus rules for polynomials with complex coefficients, Proceedings of the 21st Mediterranean Conference on Control and Automation, (2013), 663–670.
[12] A. Doria–Cerezo and M. Bodson: Design of controllers for electrical power systems using a complex root locus method, IEEE Transactions on Industrial Electronics, 63(6), (2016), 3706–3716.
[13] A. Ferrante, A. Lepschy, and U. Viaro: A simple proof of the Routh test, IEEE Transactions on Automatic Control, AC-44(1), (1999), 1306–1309.
[14] A. Hurwitz: Ueber die Bedingungen, unter welchen eine Gleichung nur Wurzeln mit negativen reellen Theilen besitzt, Mathematiche Annalen Band, 46 (1895), 273–284.
[15] R. Imbach and V.Y. Pan: Polynomial root clustering and explicit deflation, arXiv:1906.04920v2.
[16] E.I. Jury and J. Blanchard: A stability test for linear discrete systems in table form, I.R.E. Proceedings, 49(12), (1961), 1947–1948.
[17] T. Kaczorek: Selected Problems of Fractional Systems Theory, Lecture Notes in Control and Information Sciences, 411, Springer, Berlin, Germany, 2011.
[18] W. Krajewski, A. Lepschy, G.A. Mian, and U. Viaro: A unifying frame for stability-test algorithms for continuous-time systems, IEEE Transactions on Circuits and Systems, CAS-37(2), (1990), 290–296.
[19] W. Krajewski, A. Lepschy, G.A. Mian, and U. Viaro: Common setting for some classical z-domain algorithms in linear system theory, International Journal of Systems Science, 21(4), (1990), 739–747.
[20] W. Krajewski and U. Viaro: Root locus invariance: Exploiting alternative arrival and departure points, IEEE Control Systems Magazine, 27(1), (2007), 36–43.
[21] B.C. Kuo: Automatic Control Systems (second ed.), (1967), Prentice-Hall, Englewood Cliffs, NJ, USA.
[22] P.K.Kythe: Handbook of Conformal Mappings and Applications, Chapman and Hall/CRC Press, London, UK, 2019.
[23] A. Lepschy, G.A. Mian, and U. Viaro: A stability test for continuous systems, Systems and Control Letters, 10(3), (1988), 175–179.
[24] A. Lepschy, G.A. Mian, and U. Viaro: A geometrical interpretation of the Routh test, Journal of the Franklin Institute, 325(6), (1988), 695–703.
[25] A. Lepschy, G.A. Mian, and U. Viaro: Euclid-type algorithm and its applications, International Journal of Systems Science, 20(6), (1989), 945– 956.
[26] A. Lepschy, G.A. Mian, andU. Viaro: Splitting of some s-domain stabilitytest algorithms, International Journal of Control, 50(6), (1989), 2237–2247.
[27] A. Lepschy, G.A. Mian, and U. Viaro: An alternative proof of the Jury- Marden stability criterion, Control and Computers, 18(3), (1990), 70–73.
[28] A. Lepschy, G.A. Mian, and U. Viaro: Efficient split algorithms for continuous-time and discrete-time systems, Journal of the Franklin Institute, 328(1), (1991), 103–121.
[29] A. Lepschy and U. Viaro: On the mechanism of recursive stability-test algorithms, International Journal of Control, 58(2), (1993), 485–493.
[30] A. Lepschy and U. Viaro: Derivation of recursive stability-test procedures, Circuits, Systems, and Signal Processing, 13(5), (1994), 615–623.
[31] S. Liang, S.G. Wang, and Y. Wang: Routh-type table test for zero distribution of polynomials with commensurate fractional and integer degrees, Journal of the Franklin Institute, 354(1), (2017), 83–104.
[32] A. Lienard and M.H. Chipart: Sur le signe de la partie réelle des racines d’une équation algébrique, Journal of Mathématiques Pures et Appliquée, 10(6), (1914), 291–346.
[33] M. Marden: Geometry of Polynomials [2nd ed.], American Mathematical Society, Providence, RI, USA, 1966.
[34] I. Petras: Stability of fractional-order systems with rational orders: a survey, Fractional Calculus & Applied Analysis, 12(3), (2009), 269–298.
[35] A.G. Radwan, A.M. Soliman, A.S. Elwakil, and A. Sedeek: On the stability of linear systems with fractional order elements, Chaos, Solitons and Fractals, 40(5), (2009), 2317–2328.
[36] E.J. Routh: A Treatise on the Stability of a Given State of Motion, Particularly Steady Motion, Macmillan, London, UK, 1877.
[37] J. Schur: Über Potenzreihen, die im Innern des Einheitskreises beschränkt sind, Journal für die reine und angewandte Mathematik, 147, (1917) 205– 232, DOI: 10.1515/crll.1917.147.205.
[38] R.Tempo: A Simple Test for Schur Stability of a Diamond of Complex Polynomials, Proceedings of the 28th IEEE Confewrence on Decision and Control (1989), 1892–1895.
[39] U. Viaro: Stability tests revisited, In A Tribute to Antonio Lepschy, G. Picci and M.E. Valcher, Eds., Edizioni Libreria Progetto, Padova, Italy, pp. 189– 199, 2007.
[40] U. Viaro: Twenty–Five Years of Research with Antonio Lepschy, Edizioni Libreria Progetto, Padova, Italy, 2009.
[41] U. Viaro (preface by W. Krajewski): Essays on Stability Analysis and Model Reduction, Polish Academy of Sciences, Warsaw, Poland, 2010.
[42] R.S. Vieira: Polynomials with symmetric zeros, arXiv:1904.01940v1 [math.CV], 2019.
Go to article

Authors and Affiliations

Daniele Casagrande
1
Wiesław Krajewski
2
Umberto Viaro
1

  1. Polytechnic Department of Engineering and Architecture, University of Udine, via delle Scienze 206, 33100 Udine, Italy
  2. Systems Research Institute, Polish Academy of Sciences, ul. Newelska 6, 01–447 Warsaw, Poland
Download PDF Download RIS Download Bibtex

Abstract

Due to the extensive use of nonlinear power consumers, there is currently an urgent problem of high harmonic content in power supply networks. The paper provides experimental investigations and a study of the nature of the change in the main harmonic components of the current in the neutral working wire of a three-phase four-wire network with a voltage of 0.38 kV. The purpose of this study is to compare the load readings on the amplitude-phase-frequency characteristics of the current in the neutral working wire of the 0.38 kV network with the linear and non-linear load. To study the effect of load changes on the amplitude-phase-frequency characteristics of currents in the linear and zero working wires at the input of the load node, measurements were carried out by certified electrical measuring instruments. The analysis of the results obtained for the load node whose power was formed mainly by a lighting system with fluorescent and LED lamps and a system of office electrical receivers (computers, copiers, printers, scanners, etc.) was performed. It can be concluded that a current comparable to the currents of the linear wires of the network flows from the load node with the predominant nonlinear power receivers through the zero-working wire. At the same time, in the zero-working wire of the network, the third harmonic currents prevail over the main frequency currents.
Go to article

Bibliography

[1] Golub I., Boloev E., Methods of linear and nonlinear state estimation of distribution network, Proceedings of E3S Web of Conferences, Irkutsk, Russian Federation (2018).
[2] Grigoriev O.A., Petukhov V.S., Sokolov V.A., Krasilov I.A., On the impact of electronic equipment on power networks, Computer Press 1, http://www.compress.ru/article.aspx?id=9553&iid=404 (2003).
[3] Om P.M., Abdul G.S., Neeraj G., Acritical review of detection and classification of power quality events, Renewable and Sustainable Energy Reviews, no. 41, pp. 495–505 (2015).
[4] Daus Y.V., Yudaev I.V., Taranov M.A., Voronin S.M., Gazalov V.S., Reducing the costs for consumed electricity through the solar energy utilization, International Journal of Energy Economics and Policy, vol. 9, no. 2, pp. 19–23 (2019).
[5] Ded A.V., To the problem of the current state of the levels of indices of asymmetry of voltages and currents in networks of 0.4 kV, Omsk Scientific Herald, vol. 2, no. 152, pp. 63–65 (2017).
[6] Kosoukhov F.D., Vasiliev N.V., Kuznetsova E.S., New scientific directions in energy saving in threephase transformers and four-wire lines with asymmetric, non-linear and reactive loads, News of St. Petersburg State Agrarian University, vol. 2, no. 47, pp. 300–309 (2017).
[7] Belitsky A.A., Shklyarsky Y.E., Estimation of additional power losses in networks with non-linear and asymmetric load, Bulletin of Tula State University, Technical Science, no. 7, pp. 86–93 (2018).
[8] Deokar S.A., Waghmare L.M., Analysis of distribution transformer performance un-der non-linear balanced load conditions and it’s remedial, International Journal of Technology and Advanced Engineering, vol. 1, no. 2, pp. 152–161 (2011).
[9] Corasaniti V.F., Barbieri M.B., Arnera P.L., Valla M.I., Characteristics of the loads in medium voltage networks from the point of view using active filters, in IEEE PES Transmission and Distribution Conference and Exposition, pp. 1–7 (2006).
[10] Ge J., Shuai Z., Zhao H., Shen Z.J., Generalized power and current control for three-phase fourwire converter under unbalanced grid conditions, Procceding of the IECON, Lisbon, Portugal, pp. 3900–3905 (2019).
[11] Szulborski M., Kolimas Ł., Łapczynski S., Szczęśniak P., Single phase UPS systems loaded with nonlinear circuits: Analysis of topology in the context of electric power quality, Archives of Electrical Engineering, vol. 68, no. 4, pp. 787–802 (2019).
[12] Barutskov I.B., Vdovenko S.A., Tsygankov E.V., Harmonic distortion during operation of frequency converters, Chief Power Engineer, no. 6, pp. 5–13 (2011).
[13] Om P.M., Abdul G.S., Topological aspects of power quality improvement techniques: A comprehensive overview, Renewable and Sustainable Energy Reviews, no. 58, pp. 1129–1142 (2016).
[14] Bodart M., Denejer A., Keppens A., Rikart U.R., Rojzin B., Characteristics of compact fluorescent lamps with integrated ballasts and their comparison with incandescent lamps, Lighting Engineering, no. 2, pp. 18–24 (2010).
[15] Suslov K.V., Stepanov V.S., Solonina N.N., Effect of high harmonics on electricity consumers in distribution networks, in 2013 International Symposium on Electromagnetic Compatibility (EMC Europe 2013), pp. 841–845 (2013).
[16] Fursanov M.I., Zalotoy A.A., Makarevich V.V., Calculation of technological consumption (loss) of electricity in modern 0.38-10 kV electrical distribution networks, Energetika, Proceedings of CIS Higher Education Institutions and Power Engineering Associations, vol. 61, no. 5, pp. 408–422 (2018).
[17] Florkowski M., Florkowska B., Zydron P., High voltage harmonics induced modifications of PD phase-resolved patterns, Archives of Electrical Engineering, vol. 67, no. 2, pp. 231–246 (2018).
[18] European Standard EN 62040-3, https://files.stroyinf.ru/Data/704/70439.pdf (2018).
[19] Zeng X.J., Zhai H.F., Wang M.X., Yang M., Wang M.Q., A system optimization method for mitigating three-phase imbalance in distribution network, International Journal of Electrical Power and Energy Systems, no. 113, pp. 618–633 (2019).
Go to article

Authors and Affiliations

Igor V. Yudaev
1
Evgeny V. Rud
2
Mikhail A. Yundin
1
Tamara Z. Ponomarenko
2
Aleksandra M. Isupova
1

  1. Azov-Black Sea Engineering Institute of Don State Agrarian University, Russia
  2. ICPE Energy Institute for Advanced Studies of the PJSC “Kubanenergo”, Russia

This page uses 'cookies'. Learn more