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排序方式: 共有244条查询结果,搜索用时 265 毫秒
31.
32.
E.P. Domashevskaya V.A. Terekhov L.N. Marshakova Ya.A. Ugai V.I. Nefedov N.P. Sergushin 《Journal of Electron Spectroscopy and Related Phenomena》1976,9(3):261-267
X-ray photoelectron and X-ray spectroscopic data have been used to study the participation of the d-electrons in chemical bonding and their role in theWith increasing metal atomic number within one group the d sub-band increases by ca. 2 eV in group I and by ca. 1 eV in group II. In the sulphur compou 相似文献
33.
34.
Experimental results on convective heat transfer from a single cube on a flat surface are presented for different attack angles
to the incident flow and Reynolds numbers. The character of vortex formation and the effect of flow structure on heat transfer
at detached flow around a cube were studied by visualization. Local heat transfer and heat transfer averaged over the separate
faces and the whole lateral surface of the cube were studied. Contribution of separate cube faces to total heat transfer depending
on the attack angle was estimated. Data obtained were compared with those published in literature. The reasons for observed
differences caused by the effect of many factors: boundary layer thickness, turbulence level of the incident flow, channel
constraint, etc., are analysed. 相似文献
35.
N. I. Mukhurov S. P. Zhvavyi I. V. Gasenkova S. N. Terekhov P. P. Pershukevich V. A. Orlovich 《Journal of Applied Spectroscopy》2010,77(4):549-555
Results are reported from a study of the optical properties of porous alumina films obtained by anodizing in a water solution
of sulfuric acid and modified by thermal annealing in air at T ≥ 850°C. A comparative analysis of the data shows that the
near-UV and visible photoluminescence of alumina anodized in a sulfuric acid solution is caused primarily by oxygen divacancies
(F2, F2+ _2^{+} , and F22 + _2^{2 + } centers), while sulfate ions have little effect on the luminescence properties of anodic alumina in this spectral range. 相似文献
36.
é. P. Domashevskaya S. A. Storozhilov S. Yu. Turishchev V. M. Kashkarov V. A. Terekhov O. V. Stogne Yu. E. Kalinin A. V. Sitnikov S. L. Molodtsov 《Physics of the Solid State》2008,50(1):139-145
The electronic structure and phase composition of (Co41Fe39B20)
x
(SiO2)1 − x
nanocomposites are studied by x-ray absorption near-edge spectroscopy, which is extremely sensitive to the chemical environment
of elements in multicomponent compounds. An analysis of the recorded Fe L
2, 3, Co L
2, 3, B K, Si L
2, 3, and O K absorption spectra demonstrates interatomic interactions between the elements of the metallic and dielectric components of
the nanocomposites. As a result of these interatomic interactions, a complex multiphase system, whose electronic structure
should determine the transport and magnetic properties of the nanocomposites, forms. In particular, the transformation of
the fine structure of the iron L
2, 3 spectra reflects a change in the ratio of divalent to trivalent iron in its oxides and/or silicates. CoO and complex boron
oxides are found to exist in the nanocomposites. The electrical conductivity of a FeO · F2O3 · CoO grain embedded in the silicate-oxide medium of the nanocomposites is controlled by electron exchange between Co2+, Fe2+, and Fe3+ ions. The dielectric component consists of a mixture of silicon oxide and the silicates/borosilicates of transition metals.
Original Russian Text ? é.P. Domashevskaya, S.A. Storozhilov, S.Yu. Turishchev, V.M. Kashkarov, V.A. Terekhov, O.V. Stogneĭ,
Yu.E. Kalinin, A.V. Sitnikov, S.L. Molodtsov, 2008, published in Fizika Tverdogo Tela, 2008, Vol. 50, No. 1, pp. 135–141. 相似文献
37.
We calculate exactly the vacuum polarization charge density in the field of a subcritical Coulomb impurity, Z|e|/r, in graphene. Our analysis is based on the exact electron Green's function, obtained by using the operator method, and leads to results that are exact in the parameter Zalpha, where alpha is the "fine-structure constant" of graphene. Taking into account also electron-electron interactions in the Hartree approximation, we solve the problem self-consistently in the subcritical regime, where the impurity has an effective charge Z(eff), determined by the localized induced charge. We find that an impurity with bare charge Z=1 remains subcritical, Z(eff)alpha<1/2, for any alpha, while impurities with Z=2, 3 and higher can become supercritical at certain values of alpha. 相似文献
38.
Lestinsky M Lindroth E Orlov DA Schmidt EW Schippers S Böhm S Brandau C Sprenger F Terekhov AS Müller A Wolf A 《Physical review letters》2008,100(3):033001
Term energies for dielectronic-recombination Rydberg resonances below 0.07 eV are determined for Sc18+ with absolute accuracies below 0.0002 eV by electron collision spectroscopy in an ion storage ring, using the twin-electron-beam technique and a cryogenic photocathode. The lithiumlike 2s_{1/2}-2p_{3/2} transition energy for Z=21 is determined to 4.6 ppm, less than 1% of the few-body effects on radiative corrections. Features from the hyperfine structure of the 2s state could be resolved in the dielectronic-recombination spectrum. 相似文献
39.
Kimia Ghobadi Taewoo Lee Houra Mahmoudzadeh Daria Terekhov 《Operations Research Letters》2018,46(3):339-344
Given an observation of a decision-maker’s uncertain behavior, we develop a robust inverse optimization model for imputing an objective function that is robust against mis-specifications of the behavior. We characterize the inversely optimized cost vectors for uncertainty sets that may or may not intersect the feasible region, and propose tractable solution methods for special cases. We demonstrate the proposed model in the context of diet recommendation. 相似文献
40.
The results of numerical simulation of the structure of non-isothermal polydisperse bubbly turbulent flow and heat transfer behind a sudden tube expansion are presented. The study was carried out at a change in the initial diameter of the air bubbles within d m1 = 1–5 mm and their volumetric void fraction β = 0–10 %. Small bubbles are available in almost the entire cross section of the tube, while the large bubbles pass mainly through the flow core. An increase in the size of dispersed phase causes the growth of turbulence in the liquid phase due to flow turbulization, when there is a separated flow of liquid past the large bubbles. Adding the air bubbles causes a significant reduction in the length of the separation zone and heat transfer enhancement, and these effects increase with increasing bubble size and their gas volumetric flow rate ratio. 相似文献