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361.
R. V. Arutyunyan E. V. Akhrameev L. A. Bolshov P. S. Kondratenko E. V. Tkalya 《JETP Letters》2014,98(11):680-683
The possible regimes of the propagation of a self-sustained fluorescence wave of long-lived nuclear isomers, which is initiated by transitions to the nearest short-lived level owing to the absorption of X-ray photons and inelastic collisions of electrons in a plasma, have been analyzed. It has been found that, when the energy exchange between the nuclear subsystem and plasma is due to absorption and emission of photons, the fluorescence wave can propagate in the fast (with a near-light velocity) deflagration regime induced by the radiative heat transfer mechanism. When the energy exchange between the subsystems is nonradiative, the (slower) detonation regime becomes significant. The implementation of each of the two regimes requires certain conditions on the characteristics of the system. 相似文献
362.
A. M. Kondratenko Ya. S. Derbenev Yu. N. Filatov F. Lin V. S. Morozov M. A. Kondratenko Y. Zhang 《Physics of Particles and Nuclei》2014,45(1):323-324
We propose a scheme of preserving the proton and deuteron beam polarizations during acceleration and storage in the proposed electron-ion collider at Jefferson Lab. This scheme allows one to provide both the longitudinal and transverse polarization orientations of the proton and deuteron beams at the interaction points of the figure-8 ion collider ring. We discuss questions of matching the polarization direction at all stages of the beam transport including the pre-booster, large booster and ion collider ring. 相似文献
363.
I. A. Zhuravel’ E. A. Bugaev L. E. Konotopskii V. A. Sevryukova E. N. Zubarev V. V. Kondratenko 《Technical Physics》2014,59(5):701-707
The structural evolution of a C/Si periodical multilayers is studied by small-angle X-ray diffraction and cross-section transmission electron microscopy. Mixed zones 0.6–0.65 nm thick with different densities are detected at the C/Si and Si/C interfaces in the initial state. The effect of annealing on the thickness, the density, and the phase composition of the layers and the mixed zones is investigated in the temperature range 300–1050°C. Two stages of changing the multilayer composition period upon heating are found. The period increases as the temperature increases up to 700°C and then decreases. The fracture of the composition begins in the silicon layers, where pores and cubic 3C-SiC nanocrystals form at 900°C. The fracture of the layered structure of the composition is completed at T > 1000°C. 相似文献
364.
I. A. Artyukov V. A. Burtsev A. V. Vinogradov A. Yu. Devizenko N. V. Kalinin I. A. Kopylets V. V. Kondratenko V. E. Pukha B. A. Savitskii R. M. Feshchenko 《Technical Physics》2012,57(9):1283-1288
Linear zone plates for hard (E > 10 keV) X rays are considered. The technology of the plates includes cutting magnetron-sputtered W5Si3/Si multilayer coatings. The results of numerical computation suggest that this pair of materials provides a high efficiency in the first and second diffraction orders. It is found experimentally that good multilayer structures consisting of several hundreds of layers can be synthesized on silicon and glass substrates. It is shown that they can be cut by ion etching the multilayer coating through a mask. 相似文献
365.
Anna Zanina Dr. Vita A. Kondratenko Denis Makhmutov Dr. Henrik Lund Jianshu Li Juan Chen Dr. Yuming Li Prof. Dr. Guiyuan Jiang Prof. Dr. Evgenii V. Kondratenko 《ChemCatChem》2024,16(2):e202300885
The present study of oxidative coupling of methane (OCM) over MnOx−Na2WO4/support catalysts demonstrated that the selectivity to C2H6 and C2H4 (C2-hydrocarbons) is affected by the kind of support, co-fed water, and the kind of oxidant (O2 vs. N2O). In addition to previous studies with MnOx−Na2WO4/SiO2, an enhancing water effect was obtained using catalysts based on TiO2- or ZrO2-containing supports. However, a negative effect on methane conversion was established for SiO2−Al2O3-supported catalysts. Temporal analysis of products with isotopic tracers suggests that the ability of MnOx−Na2WO4 to generate diatomic adsorbed oxygen species depends on the kind of support and is the key property for the water effect. The strength of the water effect on the activity decreases with an increase in the surface area of working catalysts. The kind of support also affects products selectivity due to its influence on the mobility/releasability of lattice oxygen in supported MnOx−Na2WO4. Among the prepared catalysts, MnOx−Na2WO4/TiO2 was found to be promising for H2O-assisted OCM. The use of N2O instead of O2 further increases the selectivity to C2-hydrocarbons to 84 % at 6.8 % CH4 conversion due to the formation of predominantly monoatomic oxygen species from N2O that selectively convert CH4 into C2H6. 相似文献
366.
A. I. Fedorenko V. V. Kondratenko Yu. P. Pershin O. V. Poltseva E. N. Zubarev L. L. Balakireva V. V. Didyk V. V. Burtsev 《Crystal Research and Technology》1994,29(8):1139-1147
Structure and optical properties (at λ - 0.154 nm and λ - 3.16 nm) of W Ti, W TiN, W Sc, and Cr Sc multilayer X-ray mirrors for long wave part of “water window”' wavelength range (3.1–4.4 nm) were studied by methods of X-ray diffractometry and cross-sectional electron microscopy. The reflectivities at λ - 0.154 nm are increased going from W TiN, Cr Sc, W Ti to W Sc multilayers. Cr Sc mirrors have highest reflectivity and resolution at λ - 3.16 nm. Influence of the ambient atmosphere on optical properties of multilayer mirrors is shown. 相似文献
367.
Dr. Guo-Qing Yang Dr. Yiming Niu Dr. Vita A. Kondratenko Dr. Xianfeng Yi Dr. Chang Liu Prof. Dr. Bingsen Zhang Prof. Dr. Evgenii V. Kondratenko Prof. Zhong-Wen Liu 《Angewandte Chemie (International ed. in English)》2023,62(49):e202310062
Knowing the structure of catalytically active species/phases and providing methods for their purposeful generation are two prerequisites for the design of catalysts with desired performance. Herein, we introduce a simple method for precise preparation of supported/bulk catalysts. It utilizes the ability of metal oxides to dissolve and to simultaneously precipitate during their treatment in an aqueous ammonia solution. Applying this method for a conventional VOx−Al2O3 catalyst, the concentration of coordinatively unsaturated Al sites was tuned simply by changing the pH value of the solution. These sites affect the strength of V−O−Al bonds of isolated VOx species and thus the reducibility of the latter. This method is also applicable for controlling the reducibility of bulk catalysts as demonstrated for a CeO2−ZrO2−Al2O3 system. The application potential of the developed catalysts was confirmed in the oxidative dehydrogenation of ethylbenzene to styrene with CO2 and in the non-oxidative propane dehydrogenation to propene. Our approach is extendable to the preparation of any metal oxide catalysts dissolvable in an ammonia solution. 相似文献