Volume 61 Issue 2 (2011) - Годишник на ТУ - София - Технически ...

Годишник на Технически Университет - София, т. 61, кн.2, 2011Proceedings of the Technical University - Sofia, v. 61, book 2, 2011CONTENTS volume 61, Issue 2MATHEMATICS, ELECTRICAL ENGINEERING, POWER ENGINEERING, COMMUNICATIONS1. Ivan Trendafilov, Dimitrinka Vladeva . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Endomorphism Semirings Without Zero of a Finite Chain2. Ivan Trendafilov, Dimitrinka Vladeva. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Endomorphism Semirings Without Zero of a Finite Semilattice of a Special Type3. Mariana Durcheva . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Public Key Cryptosystem Based on Endomorphism Semirings of a Finite Semilatticeof a Special Type4. Bogdan Gilev. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39“Memorizing” of Functions Using Minimum Number of Points and SubdivisionSchemes5 Iasen Todorov, Marin Ivanov, Dejan Andonov, Dimo Stoilov, Rad Stanev. . . . . . . . . . . . . . 47Study of Steady State Operation Modes of a Power Distribution Network IncorporatingWind Generators6 Kiril Stoykov, Stefan Staykov, Kalinka Todorova. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57Furnace Transformers - Characteristics, part 17. Kiril Stoykov . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67Some Problems in Voltage Control of Furnace Transformers with Power Lower1000 kVa8. Peter Dineff, Dilyana Gospodinova, Ivalina Avramova, Todorka Vladkova,Carmen Gaidau . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77Investigation on Dielectric Barrier Discharge Surface Activation Effects - part 19. Peter Dineff, Dilyana Gospodinova, Ivalina Avramova, Todorka Vladkova,Carmen Gaidau . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85Investigation on Dielectric Barrier Discharge Surface Activation Effects - part 210. Рeter Dineff, Dilyana Gospodinova, Rajna Tzeneva. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95Magnetic Stimulated Dielectric Barrier Discharge to Terms of Longitudinal MagneticIsolation11. Iliana Marinova, Aneliya Terzova, Valentin Mateev . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105Shape Determination of Magnetic Core by Genetic Algorithm12. Valentin Mateev, Iliana Marinova, Aneliya Terzova . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113Transient Electromagnetic Modeling of Electromagnetic System13. Raina Tzeneva . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123Modeling of Skin and Proximity Effects14. Vladimir Lazarov, Zahari Zarkov, Ludmil Stoyanov, Dimitar Sprirov. . . . . . . . . . . . . . . . . 133Maximum Power Operation of Wound Rotor Asynchronous Machine for WindGenerator15. Vladimir Lazarov, Zahari Zarkov, Ludmil Stoyanov, Hristiyan Kanchev . . . . . . . . . . . . . . 143Experimental Testing of Suprecapacitors and Evaluation of their Parameters© 2011 Publishing House of Technical University of Sofia5All rights reserved ISSN 1311-0829