issue 9-10

20180910-04
Experimental characterization of laser cladding of Stellite 21 on H13 tool steel
Prakash Kattire, Valmik Bhawar, Sandeep Thakare, Rajkumar Singh

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The repair of dies and molds by using additive manufacturing techniques such as laser cladding (LC) is an important and emerging trend in tooling industry today. LC provides an alternative to the traditional deposition techniques. ...  read more

20180910-05
Model-based approach for the shape estimation of electron beam welding joints
Tsvetomira S. Tsonevska, Elena G. Koleva, Georgi M. Mladenov

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This article discusses a modeling approach for the obtained by electron beam welding molten pool shapes, which is based on experimental data, type mathematical function and regression analysis. The process of electron beam ...  read more

20180910-06
Construction of a preliminary file backup system for surface analysis data using secret sharing technique
Nobuharu Okamitsu, Tomonori Tabe, Ryota Matsuda, Noriyuki Yamada, Toyoharu Takemoto, Takeshi Tanaka

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We have established a preliminary file backup system to study the outline of secret sharing technology and test operations. Secret sharing scheme is a key management scheme or key establishment scheme invented separately in ...  read more

20180910-07
Model-driven development of event management system
Tsvetelina Ivanova, Elena Koleva, Idilia Batchkova, Dobrin Nikolov

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Electron Beam Technologies Conference is an international conference, which originated in 1985. The challenge for the management of this event, as well as the numerous such events that are organized every year around the world, ...  read more

20180910-08
Analysis of the ergonomic quality of e-learning through statistical methods
Maria Todorova, Elena Koleva, Ivelina Kotseva

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A key factor in e-learning in the future will be a quality orientation that firstly places learners or users of education services. They have to take the lead in terms of quality concepts of e-learning, since their professional ...  read more

20140910-full
Issue 9-10, 2014

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 49. No 9-10/2014
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20140910-full

C O N T E N T S

TELECOMMUNICATIONS SCIENCE

Mario Ivanov, Biser Stefanov
Approaching risk management in IT by implementing it in ITIL 2

Kamelia ...  read more

20140910-07
Visible light as a communication medium – from illumination to data transmission
Boris Jovchev, Rositza Mladenova

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The fast development of new Li-Fi (Light-Fidelity) technology based on the unique physical properties of visible light will make it possible to build high-speed telecommunications networks with high cell density, compatible ...  read more

20140910-06
Development and application of induction and resistive electrical heating systems for industrial pipelines
Alexander B. Kuvaldin, Maxim A. Fedin, Michail L. Strupinskiy, Nikolay N. Khrenkov

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This paper examines problems of calculation of heating units for ferromagnetic steel in weak electromagnetic fields. Such installations are low-temperature induction heating installations. In these plants, the electromagnetic ...  read more

20140910-05
Network voltage distortion by arc furnace and its mitigation
Sergey E. Ryvkin, Danil A. Drozhzhin

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Electric arc furnace (EAF) is the most dangerous type of load for power systems. It causes different kinds of distortion due to its frequently variable character. Nowadays there are different types of arc furnaces. This article ...  read more

20140910-04
Sensitivity investigations of second-order bandpass/bandstop filter sections
Maria Nenova

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Three recursive tunable biquadratic sections are studied and compared in this paper. The transfer function sensitivities and the impact of the quantization process of the multiplier coefficients on the behavior of the structures ...  read more