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排序方式: 共有170条查询结果,搜索用时 15 毫秒
1.
Khutoryan Eduard Kuleshov Alexei Ponomarenko Sergey Lukin Konstantin Tatematsu Yoshinori Tani Masahiko 《Journal of Infrared, Millimeter and Terahertz Waves》2021,42(6):671-683
Journal of Infrared, Millimeter, and Terahertz Waves - Various regimes of hybrid, bulk-surface, modes being excited in the clinotron oscillator with a sheet electron beam and nonuniform grating... 相似文献
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Alexander V. Bernstein Alexander P. Kuleshov 《International Journal of Software and Informatics》2013,7(3):359-390
One of the ultimate goals of Manifold Learning (ML) is to reconstruct an unknown nonlinear low-dimensional Data Manifold (DM) embedded in a high-dimensional observation space from a given set of data points sampled from the manifold. We derive asymptotic expansion and local lower and upper bounds for the maximum reconstruction error in a small neighborhood of an arbitrary point. The expansion and bounds are defined in terms of the distance between tangent spaces to the original DM and the Reconstructed Manifold (RM) at the selected point and its reconstructed
value, respectively. We propose an amplification of the ML, called Tangent Bundle ML, in which proximity is required not only between the DM and RM but also between their tangent spaces. We present a new geometrically
motivated Grassman & Stiefel Eigenmaps algorithm that solves this problem and gives a new solution for the ML also. 相似文献
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We study the problem of moving Chaplygin sleigh along an arbitrary surface. Motion equations for the sleigh are represented as Appel equations. We consider the case when the sleigh moves along a surface of rotation, in particular, along a plane, sphere, and cylinder. We show several cases when the sleigh’s motion equations can be fully integrated. 相似文献
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Development of Saturable Absorbers for Laser Passive Q‐Switching near 1.5 μm Based on Transparent Ceramic Co2+:MgAl2O4 下载免费PDF全文
Adrian Goldstein Pavel Loiko Zeev Burshtein Nikolai Skoptsov Ilya Glazunov Ehud Galun Nikolai Kuleshov Konstantin Yumashev 《Journal of the American Ceramic Society》2016,99(4):1324-1331
We describe the development of a reasonable cost Co2+:MgAl2O4 transparent ceramic plates fabrication technology that allows the producing of parts functioning as passive laser Q‐switches in the 1.3–1.7 μm domain. The main relevant material characteristics were measured. The absorption band, positioned between 1.2 and 1.7 μm, is typical of the 4A2 (4F) → 4T1 (4F) transition of Co2+ substituting Mg2+ ions in their Td symmetry sites. The measured ground‐state absorption cross section σgs = 2.9 × 10?19 cm2, saturation contrast γ = 0.12, and depleted ground‐state recovery time τ2 = 110–430 ns render such parts suitable for the intended application. The radiative lifetime was estimated as . The spin‐orbit splitting constant was estimated as ξSL??150 cm?1 for the 4F parent ground state, and ξSL ? –575 cm?1 for the 4P parent excited state. Obtained specimens had a transmission of ~80% (t = 2 mm, λ = 600 nm) and included some opaque, white spots. Further improvement of host optical transmission and resistance to laser damage are necessary. 相似文献
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E. A. Il’ichev A. E. Kuleshov R. M. Nabiev G. N. Petrukhin G. S. Rychkov E. G. Teverovskaya 《Technical Physics Letters》2017,43(4):345-347
A photoemissive “solar-blind” cell of a vacuum ultraviolet detector array for the 50–225 nm wavelength range is described. The cell is a cavity in the shape of frustum of a pyramid in a silicon wafer, the walls of which are coated by polycrystalline diamond film acting the part of a photosensitive cathode. The design of the cell allows one to manage the work of the detector in the “pass through” mode; i.e., photons fall to one side of the wafer, and photoelectrons release from its opposite side. Estimation of photosensitivity of the cell gives a value of about ten photons. 相似文献