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Bykov, V.,Dementiev, O. 한국전산응용수학회 2002 The Korean journal of computational & applied math Vol.9 No.1
Influence of form errors of a chamber filled with a liquid on the movement and stability of a ball, rotating in the chamber, is studied. Two cases of the influence of the chamber form errors on the forces, acting on the ball, are defined. The first case describes the situation when limitations on the rotor shift are not imposed and disturbances of the chamber form are set by spherical harmonics not above the first order. In the second case disturbance of a chamber form is arbitrary and the rotor is supposed small. A rising here diflective moment tends to direct the angular speed vector along the small semiaxis of the ellipsoid, i.e., a stable position of the rotor appears.
Volmert, Ben,Bykov, Valentyn,Petrovic, Dorde,Kickhofel, John,Amosova, Natalia,Kim, Jong Hyun,Cho, Cheon Whee Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.5
This work presents an illustration of Nagra's AMAC (Advanced Methodology for Activation Characterization) approach to the South Korean pressurized water reactor Kori-1 decommissioning. The results achieved are supported by the existing experience from the detailed AMAC applications to Swiss NPPs and are used not only for a demonstration of the applicability of AMAC to South Korean NPPs, but also for a first approximation of the activated waste volumes to be expected from Kori-1. A packaging concept based on the above activation characterization is also presented, using the AMAC algorithmic optimization software ALGOPACK leading to the minimum number of waste containers needed given the selected packaging constraints. Nagra's AMAC enables effective planning before and during NPP decommissioning, including recommendations for cutting profiles for diverse reactor components and building structures. Finally, it is expected to lead to significant cost savings by reducing the number of expensive waste containers, by optimizing a potential melting strategy for metallic waste as well as by significantly limiting the number of radiological measurements. All information about Kori-1 used for the purpose of this study was collected from publicly available sources.
Beljavin K.E.,Minko D.V.,Bykov R.P.,Kuznechik O.O. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
A connection between pulse-periodical laser radiation power and stability of liquid-metal contacts between powder particles during selective laser sintering (SLS) is determined based on analysis solving the problem of stability of liquid column in the gravity and capillary forces field. On the grounds of obtained relationships the optimization of pulse-periodical laser radiation power and SLS-process duration is realized, that allows to produce voluminous powder porous materials with pre-determined physical and mechanical properties and surface geometry. Results of metallographic investigations of powder porous materials of titanium powder produced with technological regimes calculated by means of obtained relationships are given in the work
Shestakov, Nikolay V.,Takahashi, Hiroaki,Ohzono, Mako,Prytkov, Alexander S.,Bykov, Victor G.,Gerasimenko, Mikhail D.,Luneva, Margarita N.,Gerasimov, Grigory N.,Kolomiets, Andrey G.,Bormotov, Vladimir Elsevier 2012 Tectonophysics Vol.524 No.-
<P><B>Abstract</B></P><P>Small coseismic offsets detectable using GPS techniques were found more than 2300km away from the Great Tohoku 2011 earthquake epicenter. Area of the most intense far-field co- and postseismic deformations with the maximum offset values exceeding 40 and 18mm, respectively, extends westward from Honshu Island to the Korean Peninsula, northeastern China and southern Far East Russia. Sakhalin Island does not exhibit notable displacements caused by the earthquake, in contrast to the adjacent territories. A rectangular fault model with uniform slip was developed based on the GPS-detected far-field coseismic displacements using the spherically layered Earth assumption. Both far- and near-field coseismic deformations are generally well described by a single-segment rupture of 200×96km<SUP>2</SUP>, characterized by thrust slip with minor strike-slip component of about 33m and by the seismic moment value of 1.9·10<SUP>22</SUP>N·m (Mw=8.8), which roughly constrains the major slip area. The resultant compact fault geometry revealed that the main portion of the seismic moment had been realized in a relatively small-sized rupture segment. The sensitivity of far-field GPS data to the major slip area might also be used in the development of a seismically generated giant tsunami warning system.</P> <P><B>Highlights</B></P><P>► Coseismic jumps exceeding 40mm have been detected in the far-field zone. ► Postseismic displacements greater than 18mm have also been recorded. ► In general, a simple fault model adequately explains the observed coseismic offsets. ► The main part of the seismic moment was realized by a small rupture segment. ► The far-field GPS data can be used in the development of a giant tsunami warning system.</P>