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Computational results are presented for the neutron characteristics of BIR and BIGR fast pulse reactors, specifically, cylindrical systems with a core consisting of an alloy of 90% or 36% enrichment uranium with 10 mass% molybdenum or a composite uranium–graphite material. The purpose of the calculations is to determine the possibility of increasing the size of the interior cavities in reactors without appreciably degrading the time parameters of the pulses.Reactor models with a metal core, which are best for further consideration, are systems with a disk core which have a cavity with a diameter up to 30 cm along the axis and a thickness-limited iron reflector. For reactors with uranium–graphite core, it is best to develop a new pulse reactor with an axial cavity which has a larger volume and is more accessible for sample placement than BIGR.An important problem of the calculations was to determine screen variants for a cavity which would prevent fuel overheating and at the same time be free of autocatalysis manifestations. 相似文献
3.
K. V. Vorontsov 《Pattern Recognition and Image Analysis》2010,20(3):269-285
Three general methods for obtaining exact bounds on the probability of overfitting are proposed within statistical learning
theory: a method of generating and destroying sets, a recurrent method, and a blockwise method. Six particular cases are considered
to illustrate the application of these methods. These are the following model sets of predictors: a pair of predictors, a
layer of a Boolean cube, an interval of a Boolean cube, a monotonic chain, a unimodal chain, and a unit neighborhood of the
best predictor. For the interval and the unimodal chain, the results of numerical experiments are presented that demonstrate
the effects of splitting and similarity on the probability of overfitting. 相似文献
4.
No Heading We consider domain walls between regions of superfluid 3He-B in which one component of the order parameter has the opposite sign in the two regions far from one another. We report calculations of the order parameter profile and the free energy for two types of domain wall, and discuss how these structures are relevant to superfluid 3He confined between two surfaces.PACS numbers: 67.57.Np 相似文献
5.
V. B. Vorontsov A. V. Gorchinskii A. N. Yanchenko M. G. Ardashov 《Russian Journal of Nondestructive Testing》2007,43(1):39-42
The Angara-2 acoustic-emission apparatus is intended for prompt determination of the hydrogen content in melted aluminum before teeming. The device measures the intensity of the acoustic emission (AE) accompanying crystallization of a liquid sample. The AE method allows rapid (1–3 min) determination of the gas content in melts under shop conditions near casting machines. This circumstance makes it possible to reduce the gas content of a melt at the stage of its preparation to the standard production level, thus increasing the output of suitable cast items. 相似文献
6.
Bessmertnyi V. S. Zdorenko N. M. Vorontsov V. M. Bondarenko M. A. Burlakov N. M. Makarov A. V. Kochurin D. V. 《Glass and Ceramics》2022,78(9):356-361
Glass and Ceramics - An energy-saving technology for decorating assorted glassware by plasma spraying of colored assorted and container glasses was developed. The optimal spraying parameters for... 相似文献
7.
A. L. Vorontsov 《Russian Engineering Research》2014,34(5):303-310
The kinematic and stress state associated with the insertion of a punch in a half-space is considered. 相似文献
8.
A. V. Berezin A. V. Vorontsov S. V. Zakharov M. B. Markov S. V. Parot’kin 《Mathematical Models and Computer Simulations》2013,5(5):492-500
A mathematical model of electron cascade transfer is presented. It is developed for studying the prebreakdown stage of gaseous discharge based on the kinetic equation for electrons in a self-consistent electromagnetic field. An elastic scattering of electrons, excitation of molecules by electron impact, and impact ionization are taken into account. A natural ionization background is used as the initial distribution of free electrons. The results of the computational experiment are compared to the data of measurements of drift velocity and the average energy of electrons of discharge, as well as the Townsend coefficient in a flat charged condensor filled with diluted xenon. The comparison showed that the model is not in contrast with the experiment. In order to contract the volume of the discharge’s full current calculation, a transport approximation is built. It is based on the averaging of angular scattering. The applicability of the transport approximation for modeling the full current of the capillary discharge is studied. 相似文献
9.
Russian Engineering Research - The formulas here proposed may be used to take account of how the hardening of deformable material affects not only the stress state and forces in extrusion but also... 相似文献
10.
Vorontsov MA 《Journal of the Optical Society of America. A, Optics, image science, and vision》2002,19(2):356-368
A new adaptive wave-front control technique and system architectures that offer fast adaptation convergence even for high-resolution adaptive optics is described. This technique is referred to as decoupled stochastic parallel gradient descent (D-SPGD). D-SPGD is based on stochastic parallel gradient descent optimization of performance metrics that depend on wave-front sensor data. The fast convergence rate is achieved through partial decoupling of the adaptive system's control channels by incorporating spatially distributed information from a wave-front sensor into the model-free optimization technique. D-SPGD wave-front phase control can be applied to a general class of adaptive optical systems. The efficiency of this approach is analyzed numerically by considering compensation of atmospheric-turbulence-induced phase distortions with use of both low-resolution (127 control channels) and high-resolution (256 x 256 control channels) adaptive systems. Results demonstrate that phase distortion compensation can be achieved during only 10-20 iterations. The efficiency of adaptive wave-front correction with D-SPGD is practically independent of system resolution. 相似文献