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排序方式: 共有349条查询结果,搜索用时 15 毫秒
1.
Russian Engineering Research - Formulas are derived for the most important parameters of channel extrusion. 相似文献
2.
The process of actuation is considered for the inertial element in the improved air-distributing system of pneumatic puncher whose dimensionless parameters are determined. 相似文献
3.
4.
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
5.
Transient isotopic studies in the temporal analysis of products (TAP) reactor evidenced the importance of the lifetime of oxygen species generated upon N2O decomposition on extraframework iron sites of Fe-silicalite for methane oxidation at 723 K. Fe-silicalite effectively activates CH4 when N2O and CH4 are pulsed together in the reactor. However, these oxygen species gradually become inactive for methane oxidation as the time delay between the N2O and CH4 pulses is increased from 0 to 2 s. 相似文献
6.
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
7.
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
8.
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
9.
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
10.
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