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Manuilenko O.V.,NSC Kharkov Institute of Physics and Technology | Golota V.I.,NSC Kharkov Institute of Physics and Technology
Problems of Atomic Science and Technology | Year: 2014

The results of numerical simulations of the propagation of a positive streamer in air are presented. The positive streamer dynamics in the strongly non-uniform electric fields in air was investigated for wide set of applied voltages and needle radii. It is shown that qualitatively the dynamics of positive streamer in air does not differ from the negative streamer dynamics in nitrogen. Namely, streamer velocity has the same behavior in time during propagation in discharge gap, and the same trends with applied voltage increase and with decrease of needle radius. © 2014, National Science Center, Kharkov Institute of Physics and Technology. All rights reserved. Source


Korchin A.Y.,NSC Kharkov Institute of Physics and Technology | Korchin A.Y.,University of Kharkiv | Kovalchuk V.A.,NSC Kharkov Institute of Physics and Technology
European Physical Journal C | Year: 2014

The Higgs-boson decay (Formula presented.) is analyzed. The differential decay width and forward–backward asymmetry are calculated as functions of the dilepton invariant mass in a model where the Higgs boson interacts with leptons and quarks via a mixture of scalar and pseudoscalar couplings. These couplings are partly constrained from data on the decays to leptons, (Formula presented.), and quarks (Formula presented.) (wherw q = (c,b)) while the Higgs couplings to the top quark are chosen from the two-photon and two-gluon decay rates. Nonzero values of the forward–backward asymmetry will manifest effects of new physics in the Higgs sector. The decay width and asymmetry integrated over the dilepton invariant mass are also presented. © 2014, The Author(s). Source


Bolotov O.V.,NSC Kharkov Institute of Physics and Technology | Golota V.I.,NSC Kharkov Institute of Physics and Technology | Gurtovoi S.D.,NSC Kharkov Institute of Physics and Technology
Problems of Atomic Science and Technology | Year: 2014

The temperature of nitrogen molecules in streamer discharge in point-to-plane electrode system was determined by using optical emission spectroscopy. The emission spectra of streamer discharge in air, in a wavelengths range 300…400 nm, were studied. The electronic-vibrational-rotational structure of (0-0) – band emission spectrum of N2+ nitrogen system (C3Πu-B3Πg transitions) was analyzed for different points along streamer propagation in discharge gap. The gas temperature was calculated on the basis of measurements of relative intensities in the rotational structure of the spectra. It was shown that gas temperature in the discharge gap varies in the range of 380…730 K. It was noted that for different discharge conditions the gas temperature in vicinity of the anode and cathode area is higher than in the central part of the discharge gap. © 2014, National Science Center, Kharkov Institute of Physics and Technology. All rights reserved. Source


Kalinichenko A.I.,NSC Kharkov Institute of Physics and Technology | Perepelkin S.S.,NSC Kharkov Institute of Physics and Technology | Strel'nitskij V.E.,NSC Kharkov Institute of Physics and Technology
Problems of Atomic Science and Technology | Year: 2015

Formula for intrinsic stress calculation in coatings deposited from ion flux in the pulse potential mode is derived. The criterion of applicability of derived formula is proposed which permits determining critical parameters of the pulse potential mode. Calculation of stress in DLC coatings at deposition of low-energy ions C+ from filtered vacuum arc plasma is presented. The qualitative agreement of calculated stresses with experimental data is stated. The important role of deposition temperature for intrinsic stress control in deposited coating is noted. © 2015, National Science Center, Kharkov Institute of Physics and Technology. All rights reserved. Source


Klepikov V.F.,Institute of Electrophysics and Radiation Technologies NAS of Ukraine | Lonin Y.F.,NSC Kharkov Institute of Physics and Technology | Ponomarev A.G.,NSC Kharkov Institute of Physics and Technology | Startsev O.A.,Institute of Electrophysics and Radiation Technologies NAS of Ukraine | Uvarov V.T.,NSC Kharkov Institute of Physics and Technology
Problems of Atomic Science and Technology | Year: 2015

Titanium alloy VT1-0 was modified by the high-current electron beam irradiation with energy 0.35 MeV, 5 μs impulse, and power density of 60 MW·cm-2. It was found that intense electron exposure significantly increased both hardness (by 30%) and elastic modulus (by 12%) within a subsurface layer of 100 μm thick. The thermoelastic model of the metal ablation was developed. Description of dynamics of the induced temperature and deformations distributions has been performed using the finite difference and finite element methods. © 2015, National Science Center, Kharkov Institute of Physics and Technology. All rights reserved. Source

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