Search Results - "Kovalchuk, Oleg"

The development of the superelement approach applied to models of rod elements by Kovalchuk, Oleg

“…The article deals with the rod model for the analysis of stress-strain state of rod structures. Analytical solutions are obtained by the operating method. It…”
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Modal approach in structural-dynamic equations by Kovalchuk, Oleg

“…Some aspects of the solution of inhomogeneous problems of rods and plates are considered in the article. Dynamic effects from the effects of short-term loads…”
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The rod as super-element of the subsystem by Kovalchuk, Oleg

“…The article reviews some aspects of simulation of static and dynamic conditions of building bearing structures due to its necessity for durability estimation…”
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Promotions and Team Building for Marketing Campaigns by Sodoma, Ruslana, Kovalchuk, Oleg, Sadura, Oksana, Popadynets, Nazariy

“…The article analyzes in detail the main aspects of promotional marketing in team building. Team building is very important for marketing campaigns as it allows…”
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Mathematical problems of reliability assurance the building constructions by Orlov, Victor, Kovalchuk, Oleg

“…The paper deals with a mathematical model of console type based on the nonlinear differential equation having a mobile feature of the General solution (or a…”
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Novel Robust Internal Calibration Procedure for Precise FT-IR Measurements of Nitrogen Impurities in Diamonds by Khmelnitsky, Roman, Kovalchuk, Oleg, Gorevoy, Alexey, Danilov, Pavel, Pomazkin, Daniil, Kudryashov, Sergey

“…FT-IR spectroscopy is the basic finger-print method for qualitative and quantitative analysis of nitrogen, boron, and hydrogen impurities in natural and…”
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Geochemistry and origin of the Mirny field kimberlites, Siberia by Agashev, Aleksey M., Nakai, Shun’ichi, Serov, Ilya V., Tolstov, Aleksander V., Garanin, Konstantin V., Kovalchuk, Oleg E.

“…Here we present new data from a systematic Sr, Nd, O, C isotope and geochemical study of kimberlites of Devonian age Mirny field that are located in the…”
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Study on safety and reliability of low-temperature tanks with perlite loose insulation during seismic events by Shigapov, Rustam, Kovalchuk, Oleg

“…A low-temperature tank is a type of tanks, that is used to store gas products in a liquid form at constantly low temperature under relatively low pressure…”
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"Stealth Scripts": Ultrashort Pulse Laser Luminescent Microscale Encoding of Bulk Diamonds via Ultrafast Multi-Scale Atomistic Structural Transformations by Kudryashov, Sergey, Danilov, Pavel, Smirnov, Nikita, Krasin, George, Khmelnitskii, Roman, Kovalchuk, Oleg, Kriulina, Galina, Martovitskiy, Victor, Lednev, Vasily, Sdvizhenskii, Pavel, Gulina, Yulia, Rimskaya, Elena, Kuzmin, Evgeny, Chen, Jiajun, Kovalev, Michael, Levchenko, Alexey

“…The ultrashort-laser photoexcitation and structural modification of buried atomistic optical impurity centers in crystalline diamonds are the key enabling…”
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Mathematical modeling of emergency situations at objects of production and gas transportation by Orlov, Victor, Detina, Elena, Kovalchuk, Oleg

“…Mathematical modeling attracts the attention of researchers from different fields, as one of the rigorous methods of justifying the conducted researchs…”
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Generation of Subgigawatt RF Pulses in Nonlinear Transmission Lines by Rostov, V V, Bykov, N M, Bykov, D N, Klimov, A I, Kovalchuk, O B, Romanchenko, I V

“…This paper presents the experimental results on the generation of subgigawatt radio frequency (RF) pulses using two types of nonlinear transmission lines…”
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Використання методик стратегічного аналізу при проведенні оборонного планування Державної прикордонної служби України by Bratko, Artem, Sofijan, Dmytro, Kovalchuk, Oleg

“…Державна прикордонна служба України є складовою сектору безпеки і оборони та зі зміною умов та подальшого розвитку постала необхідність у проведенні огляду…”
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Femtosecond-laser-excited luminescence of the A-band in natural diamond and its thermal control by Kudryashov, Sergey, Danilov, Pavel, Smirnov, Nikita, Levchenko, Alexey, Kovalev, Michael, Gulina, Yulia, Kovalchuk, Oleg, Ionin, Andrey

“…Ultrafast visible-range excitation in natural diamond produces UV-VIS A-band photoluminescence with marginal zero-phonon line and intense regular multi-peak…”
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Optimal direction and propagation of mid-IR light inside rough and polished diamonds for highly-sensitive transmission measurements of nitrogen content by Khmelnitsky, Roman A., Kovalchuk, Oleg E., Gulina, Yulia S., Nastulyavichus, Alena A., Kriulina, Galina Y., Boldyrev, Nikolay Y., Kudryashov, Sergey I., Levchenko, Alexey O., Shiryaev, Vladimir S.

“…Optical transmission/absorption measurements in diamond provide a way for determining content of basic nitrogen defects, with their concentrations varying in…”
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Two-Wave Ka-Band Nanosecond Relativistic Cherenkov Oscillator by Rostov, Vladislav V., Totmeninov, Eugene M., Tsygankov, Ruslan V., Kurkan, Ivan K., Kovalchuk, Oleg B., Elchaninov, Anton A., Stepchenko, Alexei S., Gunin, Alexander V., Konev, Vladimir Y., Yushchenko, Alexei Y., Emelyanov, Eugene V.

“…This paper presents the results of numerical and experimental study of a Ka-band relativistic Cherenkov oscillator with average diameter of the slow-wave…”
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Signatures of ultrafast electronic and atomistic dynamics in bulk photoluminescence of CVD and natural diamonds excited by ultrashort laser pulses of variable pulsewidth by Kudryashov, Sergey I., Danilov, Pavel A., Smirnov, Nikita A., Stsepuro, Nikita G., Rupasov, Alexey E., Khmelnitskii, Roman A., Oleynichuk, Ekaterina A., Kuzmin, Evgeny V., Levchenko, Alexey O., Gulina, Yulia S., Shelygina, Svetlana N., Sozaev, Islam V., Kovalev, Michael S., Kovalchuk, Oleg E.

“…[Display omitted] •CVD and natural diamonds exhibit similar UV free-excitonic and A-band photoluminescence, respectively.•Photoluminescence yields demonstrate…”
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THE SIMULATION OF THREE-DIMENSIONAL BAR SYSTEMS BY THE FINITE ELEMENT METHOD by Kovalchuk, Oleg

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Test of PF1 Coil Electrical Joint by Kovalchuk, Oleg, Marushin, Egor, Mednikov, Andrey, Rodin, Igor, Stepanov, Dmitry, Safonov, Alexander, Ilyin, Yuri, Bruzzone, Pierluigi, Stepanov, Boris

“…The PF1 coil manufactured in the Russian Federation is one of the six poloidal field (PF) coils of the ITER electromagnetic system. The PF1 winding represents…”
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Mechanical Tests of the ITER's PF-1 Coil Electrical Insulation Qualification Samples at 77 K by Bursikov, Andrey, Rodin, Igor, Sukhanova, Maria, Mednikov, Andrey, Nasluzov, Sergei, Stepanov, Dmitry, Kovalchuk, Oleg, Marushin, Egor, Safonov, Alexander, Akulitsky, Sergey

“…The PF1 coil is one of six poloidal field coils of the ITER magnet system. In accordance with the PF-1 coil procurement arrangement, JSC NIIEFA have…”
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Phase stabilization effect in nanosecond microwave Gunn oscillators by Kozhevnikov, Vasily Yu, Konev, Vladimir Yu, Klimov, Alexey I., Gubanov, Vladimir P., Kovalchuk, Oleg B., Kozyrev, Andrey V.

“…The paper studies the influence of semiconductor structure on microwave oscillation phase stabilization in a nanosecond Gunn oscillator during the modulating…”
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