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Energy Shift During Ion Extraction from an ICP Source
Oleksiy Vozniy,Geun Young Yeom,박병재,Kyung-Seok Min 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
In this work, the deviation of energy distribution function of energetic ions from the predetermined value in an inductively coupled plasma (ICP) ion gun source is discussed. An abnormal plasma potential increase at an extraction voltage 400 V caused a beam energy shift of up to 50 eV compared to the preset value. The ion energy peak position was found to be more affected by pressure at higher extraction voltages on the acceleration grid. The energy of primary and secondary ions was measured with an ion energy analyzer. The evolution of the ion energy distribution function during the accelerating voltage change was studied in the pressure range from $3~\times~10^{-3}$ to $1.1~\times~10^{-2}$ Torr.
Investigation of the Magnetic Properties of an RF-Driven Inductively Coupled Argon Plasma
Oleksiy Vozniy,염근영,박병재,Maksym Voronko 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.4
The magnetic permeability of an inductively coupled argon radio-frequency plasma was investigated under the local influence of a magnetizing coil, which additionally served as a probe. During the transition from one steady state to another, the electric current through the measuring transformer, as well as the value of the magnetic permeability of the medium, was shown to change. The latter strongly depended on the primary coil’s magnetizing current and on the voltage generated at the ends of the secondary coil until permeability saturation occurred. The magnetic permeability, the magnetic inductance, and the field were estimated as functions of the induced power.
Deposition of ZnO Films on an Acryl Substrate Using a DC Arc Plasmatron
Oleksiy V. Penkov,Vadim Yu. Plaksin,Min Gook Ko,Chanjoo Yim,이현주 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
The DC arc plasmatron deposition of ZnO films on acryl substrates was demonstrated. The structure and the optical properties of the films were investigated. The XRD measurements revealed that the crystalline structure of the films depended on the deposition pressure. At atmospheric pressure, the deposited films were amorphous, and decreasing pressure led to the formation of polycrystalline films. The optical transmittance of the films was around 90 % in the visible region. We showed that minimal substrate heating could be achieved by varying the deposition parameters.
Oleksiy, Melnyk,Yana, Volianska,Oleg, Onishchenko,Svitlana, Onyshchenko,Alla, Bondar,Andrii, Golovan,Nataliia, Cheredarchuk,Iryna, Honcharuk,Tetyana, Obnyavko International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.1
Maritime transport is dominant in the overall volume of all international transportation. Existence and overcoming of problems, which cause pressure on shipping safety, remain actual and fully concern both maritime and inland transport. Increasing speed and cargo capacity of the ships along with the reduction of crew members lead to the automation of a growing number of work processes, which indicates the need to actively introduce appropriate measures in the security system of sea-going ships and commercial ports and to develop modern approaches to minimize negative events and incidents in the process of ship operation. Advantages in use of modern methods of monitoring the safety of ship operations, management of possible events and incidents, including investigation of accidents, first, aimed at prevention of negative occurrences and ways of prevention on this basis. Considering statistics on incidents increase, this work presents analysis of general ship accident rate, study of major accidental events growth annually, and investigation of causes of incidents, which most frequently occur in port waters and at open sea. A survey of current approaches to ensuring the safety of shipping by implementing effective tools, such as event and incident management, has been conducted.
Tribology of Graphene: A Review
Oleksiy Penkov,김대은,김해진,김현준 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Graphene has received significant attention due to its combination of remarkable mechanical, thermal, chemical and electrical properties. Furthermore, due to its superior strength, graphene has great potential for use as an ultra-thin protective coating for various precision components. In this paper, the latest developments in tribological applications of graphene, theoretical simulations of graphene friction and preparation methods are reviewed. It is shown that various graphene coatings can be successfully used to decrease friction and wear in nano-, micro- and macro-mechanical applications. However, the conditions under which graphene serves as an effective protective coating depends on the operating parameters. A comprehensive review is provided with the aim to assess such characteristics of graphene.
Tribology of Graphene: A Review
Penkov, Oleksiy,Kim, Hae-Jin,Kim, Hyun-Joon,Kim, Dae-Eun 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.3
Graphene has received significant attention due to its combination of remarkable mechanical, thermal, chemical and electrical properties. Furthermore, due to its superior strength, graphene has great potential for use as an ultra-thin protective coating for various precision components. In this paper, the latest developments in tribological applications of graphene, theoretical simulations of graphene friction and preparation methods are reviewed. It is shown that various graphene coatings can be successfully used to decrease friction and wear in nano-, micro- and macro-mechanical applications. However, the conditions under which graphene serves as an effective protective coating depends on the operating parameters. A comprehensive review is provided with the aim to assess such characteristics of graphene.