Katia Vutova

Construction of a preliminary educational system for file backup system using secret sharing technique

Information-Technology Promotion Agency points out Ransomware as the second-ranked damage to organizations as well as individuals in “10 Major Security Threats 2017”. Information is stored in three data files separately by using ...  read more

Preliminary Estimation of Incident Ion Energy by Using Simulation Software (PEGASUS)

Plasma base ion implantation (PBII) with self-ignited plasma generated by only pulsed voltages to the test specimen has been applied to the sterilization process. We found that the PBII process reduced the numbers of active Bacillus ...  read more

Pulse Width Dependence of the Self-Ignited Plasma Using a Plasma-Based Ion Implantation

Plasma based ion implantation (PBII) with high negative pulsed voltage applied to the test specimen has been applied to the sterilization process as a technique suitable for three-dimensional work pieces. We found that the PBII process ...  read more

Study of Electron Beam Resists: Negative Tone HSQ and Positive Tone SML300

In this paper the contrast and sensitivity characteristics are investigated concerning the negative tone electron beam resist HSQ (hydrogen silsesquioxane) and the positive tone SML300 electron beam organic resist, designed for a high-aspect ...  read more

Optical and Structural Investigations of WOx Thin Films Deposited by Electron Beam Evaporation Process

Thin films of tungsten oxide are obtained at different technological parameters using electron beam evaporation process. Their optical and structure properties are investigated and the relation with process parameters is discussed. ...  read more

Electron Beam Melting and Recycling of Nickel

Experimental and theoretical investigations of the process parameters at electron beam melting and refining (EBMR) of nickel samples with the purpose of improving the composition of the performed ingots are presented and discussed. ...  read more

Economic and Conservative Numerical Scheme for Non-Stationary Heat Model for EBMR

Economic and conservative numerical method is proposed for discretization and numerical simulation of non-stationary heat model concerning electron beam melting and refining (EBMR) of metals. The axis-symmetric problem is decomposed ...  read more

Control of plasma parameters by Penning ion effect

We attempted to control the density of oxygen ions by adding argon gas and helium gas with metastable voltage to oxygen gas with ionization voltage, in order to determine the optimum combination and ratio of gases for food sterilization. ...  read more

Trends in the development of cobalt production

Cobalt, as one of the “critical” and “strategically important” metals, plays a key role in the contemporary development of the world’s industry. Cobalt has specialized applications where it is currently impossible to replace ...  read more

Training students using presentations at meetings in the fields of physics, engineering and technologies

Rapid globalization requires for researchers and engineers to have broad scientific knowledge, logical thinking, problem-solving ability, and expressiveness. To improve these skills and to help students advance in their practical communication ...  read more