Elena Koleva

20160506-27
Automation control of EBW installation by SIMATIC S7-300 PLC
Elena Kolva, Volodya Dzharov, Peter Yordanov

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In this work the automatic control of the vacuum and cooling systems, together with electron beam initiation, of the located in the IE-BAS equipment for electron beam welding, evaporation and surface modification by SIMATIC ...  read more

20160506-13
Characteristics of plasma generated during electron beam welding
Georgi M. Mladenov, Dmitriy N. Trushnikov, Elena G. Koleva, Vladimir Ya. Belenkiy

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Electron beam is at the forefront of welding technology. The choice of optimal welding modes, monitoring the weld quality and/or detecting weld defects in real-time during the electron beam welding process using nondestructive, ...  read more

20160506-03
State of the arts of additive manufacturing by selective electron beam melting
Georgi Mladenov, Elena Koleva, Lilyana Koleva, Volodya Dzharov

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In this paper the applications of electron beam additive manufacturing systems are reviewed. There by selective electron beam melting of welding wires or of some area of the upper powder layer of a sandwich structure, 2D soldered ...  read more

20170304-04
Model-based optimization of electron beam welding for obtaining defect-free welds
Elena Koleva, Lilyana Koleva, Georgi Mladenov

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The optimization of welds obtained by electron beam welding is a multi-criterial task, involving the requirements for the geometrical characteristics of the welds, together with the fulfilment of the requirements for lack ...  read more

20170506-05
Ergonomic criteria for evaluating the quality of e-learning
Maria Todorova, Dimitrina Karamanska, Elena Koleva, Lilyana Koleva

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The term “quality” is a wide-ranging concept for which each person or professional sector has its own definition. The most progressive quality point of view is that it is entirely determined by the customer or the end ...  read more