year 2018

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

20180708-13
Modelling of E-beam crosslinking of composite hydrogels
Maria Demeter, Ion Călina, Cătălin Vancea, Toni P. Paneva, Elena G. Koleva, Lilyana St. Koleva

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Response Surface Methodology and robust engineering approach were applied for the investigation of preliminary experimental data related to the synthesis of composite biopolymer-based hydrogels via electron beam (e-beam) radiation ...  read more

20180708-12
Dispersed and layered volumetric nanocrystalline materials based on copper and molybdenum condensed from the vapor phase
Nikolai Hrechaniuk, Vera Hrechaniuk, Elena Khomenko, Dmytro Kovalchuk

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The paper presents features of structure formation and phase composition on copper and molybdenum based composite materials, condensed from the vapor phase. Three types of condensed composite materials with thicknesses from ...  read more

20180708-11
Electron beam modification of the Grade 2 titanium surface after ionplasma nitriding
Andrey N. Drobov, Siarhei V. Yurevich, Igar L. Pobol

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The change of structure of Grade 2 titanium subjected to ion-plasma nitriding at 850 ℃ for 5 hours in a gas atmosphere consisting of pure argon at the heating stage, and Ar + N2 in the soaking stage, after electron-beam exposure are investigated.

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 ...  read more

20180708-10
Applied voltage dependence of plasma characteristic for food sterilization using PBII method
Kenichi Watanabe, Ryota Matsuda, Tomonori Tabe, Motoko Hiyama, Kento Sakasegawa, Yuuta Yamamoto, Koji Kakugawa, Takeshi Tanaka

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We used the PBII (Plasma Based Ion Implantation) method with self-igniting plasma and negative high-voltage pulsed power supply only to calculate the ion density inside a formed ion sheath based on a modulation circuit, by ...  read more

20180708-09
Optimum conditions for sterilization of Geobacillus stearothermophilus spores using plasma-based ion implantation
Motoko Hiyama, Koji Kakugawa, Aya Yakushiji, Kenichi Watanabe, Ryota Matsuda, Yoshinobu Tsuchiya, Takeshi Tanaka

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In recent years, substantial research into low-temperature sterilization techniques has been conducted. Plasma-based ion implantation (PBII) is a low-temperature, cost-effective technique for sterilizing medical equipment, ...  read more

20180708-08
Experimental study on sterilization of food with self-igniting plasma formed from liquid using plasma-based ion implantation
Koji Kakugawa, Manami Hosotani, Miyo Arikado, Tomonori Tabe, Kenta Fukutomi, Yoshinobu Tsuchiya, Takeshi Tanaka

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We attempted to sterilize food using plasma-based ion implantation with self-ignited plasma formed from liquid. Based on sterilization experiments, hydrogen peroxide was selected to generate self-ignited plasma. The most effective ...  read more

20180708-07
Control of plasma parameters by Penning ion effect
density distribution of plasma, density of oxygen ions, food sterilization, Pegasus simulations, Penning effect

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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 ...  read more

20180708-06
Contact characteristic for Iridium-coated probe
Koichi Miyazono, Toshitaka Yorita, Kenta Fukutomi, Tomonori Tabe, Hitoshi Suizu, Ryota Matsuda, Masayuki Yamauchi, Takeshi Tanaka

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This study considers the issue of higher probe contact resistance associated with oxidation of Al attached to the probe surface. In an experiment involving Al electrodes, there was virtually no increase in contact resistance ...  read more

20180708-05
Preliminary simulation of Magnetron sputtering using Pegasus software
Hitoshi Suizu, Ryota Matsuda, Tomonori Tabe, Hiroshi Toyota, Takeshi Tanaka

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In an r.f.-d.c. coupled magnetron sputtering system, the magnetron discharge was generated by a 13.56 MHz r.f. source, and a d.c. power was simultaneously applied to a tin target through a low-pass filter in order to control ...  read more