http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Bakin R.I.,Kiselev A.A.,Ilichev E.A.,Shvedov A.M. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.12
A comprehensive approach for modeling the pulse height spectra of gamma-ray detectors from passing radioactive cloud in a case of accident at NPP has been developed. It involves modeling the transport of radionuclides in the atmosphere using Lagrangian stochastic model, WRF meteorological processor with an ARW core and GFS data to obtain spatial distribution of radionuclides in the air at a given moment of time. Applying representation of the cloud as superposition of elementary sources of gamma radiation the pulse height spectra are calculated based on data on flux density from point isotropic sources and detector response function. The proposed approach allows us to obtain time-dependent spectra for any complex radionuclide composition of the release. The results of modeling the pulse height spectra of the scintillator detector NaI(Tl) Ø63x63 mm for a hypothetical severe accident at a NPP are presented.
Pulsed laser welding of Zr-1%Nb alloy
Maxim A. Elkin,Alexey S. Kiselev,Mikhail S. Slobodyan 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.3
Laser welding is usually a more effective method than electron-beam one since a vacuum chamber is notrequired. It is important for joining Zre1%Nb (E110) alloy in a manufacturing process of nuclear fuel rods. In the present work, effect of energy parameters of pulsed laser welding on properties of butt joints ofsheets with a thickness of 0.5 mm is investigated. The most efficient combination has been found (8e11 Jpulse energy, 10e14 ms pulse duration, 780e810 W peak pulse power, 3 Hz pulse frequency, 1.12 mm/swelding speed). The results show that ultimate strength under static loading can not be used as a qualitycriterion for zirconium alloys welds. Increased shielding gas flow rate does not allow to protect weldmetal totally and contributes to defect formation without using special nozzles. Several types of imperfectionsof the welds have been found, but the major problem is branching microcracks on the surfaceof the welds. It is difficult to identify the cause of their appearance without additional research onimproving the welding zone protection (gas composition and flow rate as well as nozzle configuration)and studying the hydrogen content in the welds.
New Magnetic Anomaly Map of the Antarctic
Golynsky, A. V.,Ferraccioli, F.,Hong, J. K.,Golynsky, D. A.,von Frese, R. R. B.,Young, D. A.,Blankenship, D. D.,Holt, J. W.,Ivanov, S. V.,Kiselev, A. V.,Masolov, V. N.,Eagles, G.,Gohl, K.,Jokat, W.,Da American Geophysical Union 2018 Geophysical research letters Vol.45 No.13
SPECTRUM OF RELATIVISTIC AND SUBRELATIVISTIC COSMIC RAYS IN THE 100 pc CENTRAL REGION
Dogiel, V. A.,Chernyshov, D. O.,Kiselev, A. M.,Nobukawa, M.,Cheng, K. S.,Hui, C. Y.,Ko, C. M.,Nobukawa, K. K.,Tsuru, T. G. IOP Publishing 2015 The Astrophysical journal Vol.809 No.1
<P>From the rate of hydrogen ionization and the gamma-ray flux, we derived the spectrum of relativistic and subrelativistic cosmic rays (CRs) nearby and inside the molecular cloud Sgr B2 near the Galactic Center. We studied two cases of CR propagation in molecular clouds: free propagation and scattering of particles by magnetic fluctuations excited by the neutral gas turbulence. We showed that in the latter case CR propagation inside the cloud can be described as diffusion with a coefficient of similar to 3 x 10(27) cm(2) s(-1). For the case of hydrogen ionization by subrelativistic protons, we showed that their spectrum outside the cloud is quite hard with a spectral index of delta > -1. The energy density of subrelativistic protons (>50 eV cm(-3)) is one order of magnitude higher than that of relativistic CRs. These protons generate the 6.4 keV emission from Sgr B2, which was about 30% of the flux observed by Suzaku in 2013. Future observations for the period after 2013 may discover the background flux generated by subrelativistic CRs in Sgr B2. Alternatively, hydrogen ionization of the molecular gas in Sgr B2 may be caused by high energy electrons. We showed that the spectrum of electron bremsstrahlung is harder than the observed continuum from Sgr B2, and in principle, this X-ray component provided by electrons could be seen from the INTEGRAL data as a stationary high energy excess above the observed spectrum E-x(-2).</P>
On One Problem of Fracture Propagation in an Ice Layer
V. F. Nikitin,안정선,A. B. Kiselev,N. N. Smirnov,이귀주 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.2
The paper is aimed at developing a model for one of many possible ice - breaking scenarios. For a relatively thin ice layer, the pressure of the leading wedge of the ship initiates tensile stresses in the horizontal plane of the ice cover. When the tensile stresses surpass a definite critical value, fracture propagationstarts in a brittle medium, beginning from the tip of the wedge. The model of damageable thermoviscoelastic media is used to describe the flat ice cover. The problem of crack propagation in the ice cover was solved numerically using by the developed model.
Novosibirsk Free Electron Laser—Facility Description and Recent Experiments
Kulipanov, Gennady N.,Bagryanskaya, Elena G.,Chesnokov, Evgeniy N.,Choporova, Yulia Yu,Gerasimov, Vasily V.,Getmanov, Yaroslav V.,Kiselev, Sergey L.,Knyazev, Boris A.,Kubarev, Vitali V.,Peltek, Sergey IEEE 2015 IEEE transactions on terahertz science and technol Vol.5 No.5
<P>The design and operational characteristics of the Novosibirsk free electron laser facility are described. Selected experiments in the terahertz range carried out recently at the user stations are surveyed in brief.</P>