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排序方式: 共有177条查询结果,搜索用时 31 毫秒
1.
Comprehensive studies of the flaw level and some structural characteristics of a composite ceramic material based on Karakeche clay (Kyrgyzstan) are carried out for a range of thermoactivation regimes and impurity contents of silicone carbides of various types. 相似文献
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DNA‐Metalization: Synthesis and Properties of Novel Silver‐Containing DNA Molecules (Adv. Mater. 24/2016) 下载免费PDF全文
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M. V. Ivanchenko E. A. Borisenko V. G. Kotlyar O. A. Utas V. V. Ustinov V. G. Lifshits 《Technical Physics Letters》2006,32(5):396-398
The formation of iron disilicide (β-FeSi2) nanoclusters as a result of solid-state epitaxy at T = 500–700°C and an iron coverage of 0.05–0.5 monolayer on a boron-modified Si(111)√3 × √3 R30° surface has been studied by scanning tunneling microscopy. It is established that the number density of β-FeSi2 nanoclusters on the Si(111) √3 × √3 R30°-B surface significantly exceeds the density of silicide clusters formed on the atomically clean Si(111) surface with a 7 × 7 reconstruction for the analogous iron coverages and annealing temperatures. At the same time, the density of point defects and clusters possessing metallic conductivity on the Si(111) √3 × √3 R30°-B surface is several orders of magnitude lower than on the Si(111)7 × 7 surface treated under identical conditions. 相似文献
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S.A. Moore L. O'Faolain M.A. Cataluna M.B. Flynn M.V. Kotlyar T.F. Krauss 《Photonics Technology Letters, IEEE》2006,18(17):1861-1863
We examine the surface recombination rate in quantum-dot semiconductor lasers and determine the diffusion length (1.0 /spl mu/m) and, for the first time, provide a value for surface recombination velocity (5/spl times/10/sup 4/ cm/s) in quantum-dot material. As a result of strong carrier confinement in the dots, these values are much lower than in comparable quantum-well lasers (5/spl times/10/sup 5/ cm/s and 5 /spl mu/m, respectively) allowing the creation of narrow (2-3 /spl mu/m wide) lasers with comparable threshold currents to those of broad area devices. 相似文献
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Julian Daniels Dan G. Blumberg Leonid D. Vulfson Alex L. Kotlyar Valentin Freiliker Gefen Ronen Jiftah Ben-Asher 《Remote sensing of environment》2003,86(2):243-256
We report remote detections of physically buried specularly reflecting objects using microwave radar at two sites: Ashalim and Tseelim in the northern region of the Negev Desert, Israel. These detections provide confirmation that microwave subsurface remote sensing is a genuine phenomenon. At Ashalim, a scatterometer operating in the P-band (441 MHz, 68 cm) was mounted on a cherry picker truck at a height of 8 m and used to detect two triangular aluminum mesh reflectors (forming a 1-m square area reflector) buried down to a depth of 8 cm in dry sand. At Tseelim, the same scatterometer was mounted on an airplane flying at an altitude of 70 m and used to detect 1-m square aluminum reflectors (each one submerged at a different location along the airplane flight path) buried down to a depth of 20 cm. The experimental results compare favorably with a theoretical model that incorporates radar absorption effects arising in the sandy subsurface layer and radar interference effects arising from phase differences between reflections from the surface and buried reflector. The theoretical modeling also predicts the detection of a subsurface reflector down to a depth of about 4.4 m. This experiment and the associated modeling approach is the first of a series of planned experiments, which we outline for the detection and the theoretical evaluation of buried reflectors using remote microwave and VHF radar. We identify potential subject areas for environmental research. 相似文献
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I. V. Minin O. V. Minin Y. R. Triandaphilov V. V. Kotlyar 《Optical Memory & Neural Networks》2008,17(3):244-248
We designed novel two type of binary 2D subwavelength (wavelength was λ= 10 mm) focus diffractive photonic crystal lens and
calculated the diffraction of plane TE-wave by use FDTD-method (our program in C++). It has been shown that diffractive photonic
crystal lens designs have not an unique solution. It has been also shown the diffractive lens with equal holes in Fresnel
zones has better focusing characteristics. Lens diameter was 5 times more than her width and full width half maximum diameter
of focal spot was 0.48λ. 相似文献