volume 50

20150506-08
Whitepaper: Employment, training and qualification needs of the European industry – a perspective from the joining sector

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Europe is the birthplace of the industrial revolution. Manufacturing is still a hallmark of Europe and an area of ample wealth generation and employment opportunities.

European manufacturing in an increasingly complex ...  read more

20150506-07
Implementing DSP-based algorithms in digital modulation tasks
Emil E. Vladkov

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The specific computational architecture of a Digital Signal Processor is the preferred candidate for solving various algorithmic subtasks related to high speed digital modulation. Utilizing a versatile modulator board interconnected ...  read more

20150506-06
A study on glare in a sports lighting environment using LED lighting and diffusion plates
Takeshi Tanaka, Koji Mukai, Masayuki Yamauchi, Masao Kochi, Atsushi Ikeda, Hideo Kuzuhara, Koichi Matsushita, Go Hironobu

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Illumination sources have been rapidly shifting in recent years to light-emitting diodes (LED), which are capable of producing more than 10,000 cd/m2 at maximum luminance. This light intensity is far greater than ...  read more

20150506-05
Experimental study of the contact resistance of crossed cylindrical reinforcing steel bars
Denitsa Darzhanova, Marina Manilova, Kostadin Milanov

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In the paper experimental results for the contact resistance between two cross-pressed cylindrical bars of reinforcing steel bars are presented. The diameters of the investigated samples were from 6 to 10 mm. At a DC measurement ...  read more

20150506-04
System for intelligent measuring, registering and control in electrical substation
Rosen Vasilev, Vladimir Chikov, Valentin Gyurov, Ivaylo Nedelchev, Stoyan Tashev, Asen Krastilev, Tzvetan Alistarov, Natalia Nikolova

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Тhe paper presents novel idea for construction of intelligence systems for measurements, data collection and control in MV/LV substations. The technical solution is based on developed microprocessor control systems. The system ...  read more

20150506-03
Derivation and analysis of ceramic materials based on BaTiO3 by using standard ceramic technology
Valentin Kolev, Anka Zeglova, Ivailo Lazarov

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Ceramic materials based on BaTiO3 have been derived by using a standard ceramic technology. Various quantities of H3BO3 and Bi3O3 have been added in order to lower the ...  read more

20150506-02
Optimally designed energy efficient transformer using global iterative algorithms
Mihail Digalovski, Goran Rafajlovski, Krste Najdenkoski

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The reduction of total losses for transformers is of great importance both from economic and environmental aspects. In the paper two optimization techniques, Global Search and Pattern Search, to minimize the total power losses ...  read more

20150506-01
Analytical approach for calculation of the electric field induced by an axisymmetric current exciter
Ilonka T. Lilyanova

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In the paper is presented an analytical approach for calculation of the electric field induced by an axisymmetric current exciter. The region in which the field is determined may have an arbitrary shape. The approach is based ...  read more

20150708-07
Modeling of electromagnetic and thermal processes occurring in induction heating cooker
Maik Streblau

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Induction heating is a famous technology and very usually used for cooking appliances because of its high-energy efficiency. A mathematical model is adopted for a flat inductor-detail system in this paper and it is used for ...  read more

20150708-06
Calculating the net cost of universal postal service – pragmatic approach
Zdravko A. Mihaylov, Valentin T. Tsenov

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The postal sector provides services of public interest. The postal services in the EU are fully liberalized with the removal of the reserved market share. Market regulation is not able to meet public needs at any time. This ...  read more