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Moskovskoye, Russia

Andreev I.I.,RAS Federal Nuclear Center | Laikin A.I.,Krylov Central Research Institute | Platovskikh Y.A.,Krylov Central Research Institute
Atomic Energy | Year: 2011

The concept of the rate of transport of exchange and non-exchange forms of radionuclides over river catchment is introduced. On this basis, a differential transport equation is proposed for finding the radionuclide content in soil and radionuclide flow into a river with nonuniform contamination of the catchment area. The time dependence of the radionuclide wash-off time constant is determined from the measurements. It is found that transport is slow, so that radionuclide decay plays a large role. A large fraction of the radionuclides, aside from the long-lived transuranium nuclides, decays within the catchment area and does not enter the river. The flow into the river is largely determined by the radionuclide content near river edge. Examples of calculations of radionuclide flow into a river and bukhta are presented. © 2011 Springer Science+Business Media, Inc. Source

Laikin A.I.,Krylov Central Research Institute | Platovskikh Yu.A.,Krylov Central Research Institute
Atomic Energy | Year: 2011

Two methods of setting the threshold for determining the difference of one γ-ray spectrum from another in the case where these differences are related with the presence of explosives are compared. In the first method, the threshold is set according to a general likelihood function corresponding to the energy channels of the spectrum. In this method, to improve the detection characteristics the number of counts in the channels must be multiplied by weighting factors. In the second method, the threshold is set according to the channel combinations. Here it is necessary to sort through the channel combinations. The calculations of the detection characteristics are performed for two setups: a neutron-activation channel is used in one and inelastic neutron scattering is used in the other. It is established that in this case the threshold setting according to the channel combinations gives better detection characteristics than threshold setting according to a likelihood function. Detection quality increases as the number of processing channels increases. © 2011 Springer Science+Business Media, Inc. Source

Grimal'Skii O.V.,Academy of Radiation | Lapovok A.Ya.,Krylov Central Research Institute | Nizkii R.Ya.,Krylov Central Research Institute
Journal of Communications Technology and Electronics | Year: 2014

The method of moments applied for the solution of integral equations arising in problems of scattering and radiation of the electromagnetic field by metal objects is generalized to structures containing cables or closely spaced parallel wires. The interactions between cable conductors are calculated with the help of solutions to plane quasi-static and quasi-stationary problems. It is shown that, with the use of the proposed approach, the arbitrary shape of the cross section of a cable and wires, as well as magnetodielectric coatings and fillings, can be taken into account. Numerical results are compared to analytical solutions and measured data. © 2014 Pleiades Publishing, Inc. Source

Kudashev E.B.,Moscow State University | Kolyshnitsyn V.A.,Krylov Central Research Institute | Marshov V.P.,Krylov Central Research Institute | Tkachenko V.M.,Krylov Central Research Institute | Tsvetkov A.M.,Krylov Central Research Institute
Acoustical Physics | Year: 2013

The spectral characteristics of turbulent pressure pulsations arising from the flow around an autonomous marine laboratory have been measured. The autonomous marine laboratory is an upgraded Dolphin buoyant device, equipped with modern digital facilities for autonomous recording, which extends the frequency range of the signals under study up to 50-60 kHz. The power spectra and cross spectra of turbulent pressure pulsations have been measured at different points of the measuring section by point pressure transducers 1.3 or 20 mm in diameter at a speed of the autonomous marine laboratory of 8-22 m/s. The measurements have revealed unexpected behavioral features of the spectra (their inflection points) at high frequencies. An analysis is performed to explain these features. In particular, it is shown that the correction function based on the more complex cross spectrum model (in comparison with the Corcos cross spectrum model) developed by Smol'yakov in 2006 predicts a monotonic (without inflection points) decrease in the spectral levels at high frequencies for reconstructed (corrected) spectra. © 2013 Pleiades Publishing, Ltd. Source

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