year 2015

20150708-05
Design of unified rail traffic management system architecture in Republic of Bulgaria
Ventsislav G. Trifonov

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The rail traffic management systems have to meet requirements of high responsibility and failsafe behaviour. It is expected that these systems will give a possibility of real-time rail traffic monitoring and ensure information ...  read more

20150708-04
Mobile multisensor node for monitoring environmental parameters in urban areas
Marin Berov Marinov

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Air quality is a matter of considerable concern as it affects public health, the environment and the economy of developed countries. Recent research has shown that air pollution can increase the incidence of diseases and impair ...  read more

20150708-03
Photodetector based on electrochemically deposited ZnO and inkjet printed PEDOT:PSS heterojunction
Nikolay Kurtev, Slavka Tzanova, Silvia Schintke

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In this paper we present a new photo-sensible device based on ZnO/PEDOT:PSS heterojunction. The formation of ZnO layer was made by electrochemical deposition of Zn from zinc nitrate solution over a transparent ITO electrode ...  read more

20150708-02
Characteristics of an electronic converter for supercapacitor charging
Dimitar Arnaudov, Nikolay Hinov, Ivan Nedyalkov

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In the following article a converter, providing mutual work between photovoltaic system and energy storage elements have been studied. The converter provides the management of the energy flows to/from the supercapacitor battery. ...  read more

20150708-01
A practical approach for introductory embedded systems teaching
Peter Yakimov

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In order to prepare the students for the challenges of their future job the Faculty of Electronic Engineering and Technologies at Technical University of Sofia accepted a new curriculum for Bachelor degree in Electronics which ...  read more

20150910-07
Comparison of different models for determining the grounding rod resistance
Nenad N. Cvetković, Dejan B. Jovanović, Aleksa T. Ristić, Miodrag S. Stojanović, Dejan D. Krstić

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Calculation methods, simulations and experimental measurement are carried out in the paper. The procedures include Method of Moments (MoM), empirical engineering equations for design of horizontal and vertical grounding rod ...  read more

20150910-06
Design of near perfect reconstruction IIR QMF banks
Nikola V. Stojanović, Dragana U. Živaljević, Negovan M. Stamenković

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In this paper, we present a novel approach for the design of near-perfect-reconstruction twoband IIR quadrature-mirror filter banks. The proposed design method is carried out in the polyphase domain, where IIR filters are ...  read more

20150910-05
FDTD simulation in wireless sensor antenna application
Bojan Dimitrijević, Bojana Nikolić, Slavoljub Aleksić, Nebojša Raičević, Hannes Toepfer, Elena Chervakova, Tino Hutschenreuther

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In this paper an own developed FDTD simulation environment is employed for antenna analysis in a wireless sensor network for traffic monitoring. The analyzed antenna is part of a WSN node that is placed in the street. The ...  read more

20150910-04
Magnetoelectric energy source
Mirza I. Bichurin, Nikolay A. Kolesnikov, Roman V. Petrov, Slavoljub Aleksić

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This article is devoted to the study of the magnetoelectric element based on magnetostrictivepiezoelectric laminate for use in energy harvesting devices. Magnetoelectric element works on the magnetoelectric effect which exhibits ...  read more

20150910-03
FEM – analysis of current displacement phenomena in slot embedded solid conductor
Marian Greconici, Gheorghe Madescu, Marius Biriescu, Martian Mot

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In the paper the low-frequency eddy currents into solid conductors embedded in a slot are theoretically analyzed. The electromagnetic field in conductors has been calculated using numerical method with a program based on finite ...  read more