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1.
The effect of low-power laser radiation on the formation of oriented cadmium sulfide layers from a vapor phase on a substrate cooled with liquid nitrogen (highly nonequilibrium conditions) is studied. The results of technological experiments, the results of a study of electron diffraction (electron diffraction patterns), and condensation diagram data are reported. It is found that, depending on the substrate temperature, laser radiation can both improve and worsen the crystal quality of films. It is shown that a condensation diagram of cadmium sulfide layers formed on a substrate exposed to low-power laser radiation is shifted to higher temperatures relative to a condensation diagram obtained without laser radiation. The experimental results are interpreted in the context of a solitonic heteroepitaxy model. 相似文献
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S. M. Loureiro E. V. Antipov J. J. Capponi M. Marezio 《Materials Research Bulletin》1995,30(12):1463-1470
Samples of the [Hg1 − xCx]-Ba2CuOy system [(Hg,C)-1201] with stoichiometries within the range 0.00≤x≤1.00 were synthesized by a highpressure, high-temperature technique. The sample with X = 0.00 [HgBa2CuO4+δ] was non-superconducting with lattice parameters A = 3.8676(2) Å, C = 9.470(1) Å. At low ranges of substitution (0.10≤x≤0.30), the predominant phase was found to be Hg-1201 with identical lattice parameters to those found for X = 0.00. At X = 0.40 the Hg-1201 phase coexists in similar proportions with the phase of mixed [Hg1 − x,Cx]-1201 stoichiometry. At X = 0.50, this second phase with lattice parameters A = 3.9271(3) Å, C = 8.676(2) Å is predominant and only traces of the Hg-1201 phase were found. At X = 0.75 the [Hg1 − x,Cx]-1201 phase found for X = 0.50 coexists with the CO3Ba2CuOy phase, which is the extreme of the substitution range. This latter was predominant at X = 1.00 with lattice parameters A = 4.0044(3) Å, C = 7.909(1) Å, but at higher pressure than the previous substitutions. This system is constituted of three main phases, HgBa2CuO4 + δ, Hg1 − xCxBa2CuOy (x ≈ 0.50) and CO3Ba2CuOy, which appear in different proportions according to the percentage of substitution and the applied synthesis pressure. 相似文献
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Automation and Remote Control - We consider the tracking problem under exogenous and parametric disturbances for nonlinear single-channel plants with mathematical model representable in a... 相似文献
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P. Jess U. Hubler H. P. Lang H. -J. Güntherodt K. Lüders E. V. Antipov 《Journal of Low Temperature Physics》1996,105(5-6):1243-1248
The superconducting energy gap distribution of poly crystalline HgBa2CuO4+ samples of differing oxygen doping levels (Tc = 94 K and Tc = 96 K) is determined by scanning tunneling spectroscopy (STS) using a low temperature scanning tunneling microscope (STM). From histograms of energy gap values the presence of two distinct energy gaps is inferred (1=8.5±1.6meV and 2=15.1±1.4meV). We attribute the different gaps to different crystallographic faces, implying a non-BCS electron-electron pairing mechanism. 相似文献
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The results of studying the phase transformations, the texture formation, and the anisotropy of the mechanical properties in Al–Cu–Li and Al–Mg–Li alloys are generalized. A technique and equations are developed to calculate the amounts of the S1 (Al2MgLi), T1 (Al2CuLi), and δ' (Al3Li) phases. The fraction of the δ' phase in Al–Cu–Li alloys is shown to be significantly higher than in Al–Mg–Li alloys. Therefore, the role of the T1 phase in the hardening of Al–Cu–Li alloys is thought to be overestimated, especially in alloys with more than 1.5% Li. A new model is proposed to describe the hardening of Al–Cu–Li alloys upon aging, and the results obtained with this model agree well with the experimental data. A texture, which is analogous to that in aluminum alloys, is shown to form in sheets semiproducts made of Al–Cu–Li and Al–Mg–Li alloys. The more pronounced anisotropy of the properties of lithium-containing aluminum alloys is caused by a significant fraction of the ordered coherent δ' phase, the deformation mechanism in which differs radically from that in the solid solution. 相似文献
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The physicomechanical properties of polymer composites based on aramide fibers that are obtained by the wet-spinning technique with the use of epoxy binders are discussed. The chemical structures of reinforcing fibers and components of epoxy binders; the microstructures, surface structures, and some properties of aramide fibers; and the processes of manufacturing high-strength reinforced composites on their basis are described. Some product samples made of these composites are presented. The investigated reinforcing materials possess high tensile strengths and tensile moduli, which make it possible to obtain products with a high level of operational characteristics on their basis. 相似文献
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