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1.
Physics of Atomic Nuclei - In this paper, the analysis of the relation between the multiplication factor of neutrons of the multiplying system measured in critical experiments and the system... 相似文献
2.
Fedoseev S. V. Ershova A. I. Lipin K. V. Mel’nik E. A. Ershov O. V. 《Russian Journal of Organic Chemistry》2021,57(8):1361-1364
Russian Journal of Organic Chemistry - The reaction of 2-chloropyridine-3,4-dicarbonitrile with anilines in propan-2-ol in the presence of N,N- diisopropylethylamine (DIPEA) in a sealed vial at... 相似文献
3.
E. V. Orlenko E. V. Ershova F. E. Orlenko 《Journal of Experimental and Theoretical Physics》2013,117(4):674-690
The formalism of exchange perturbation theory is presented with regard to the general principles of constructing an antisymmetric vector with the use of the Young diagrams and tableaux in which the coordinate and spin parts are not separated. The form of the energy and wave function corrections coincides with earlier obtained expressions, which are reduced in the present paper to a simpler form of a symmetry-adapted perturbation operator, which preserves all intercenter exchange contributions. The exchange perturbation theory (EPT) formalism itself is presented in the standard form of invariant perturbation theory that takes into account intercenter electron permutations between overlapping nonorthogonal states. As an example of application of the formalism of invariant perturbation theory, we consider the magnetic properties of perovskite manganites La1/3Ca2/3MnO3 that are associated with the charge and spin ordering in magnetic chains of manganese. We try to interpret the experimental results obtained from the study of the effect of doping the above alloys by the model of superexchange interaction in manganite chains that is constructed on the basis of the exchange perturbation theory (EPT) formalism. The model proposed makes it possible to carry out a quantitative analysis of the effect of substitution of manganese atoms by doping elements with different electron configurations on the electronic structure and short-range order in a magnetic chain of manganites. 相似文献
4.
5.
L. K. Aminov A. A. Ershova S. L. Korableva I. N. Kurkin B. Z. Malkin A. A. Rodionov 《Physics of the Solid State》2011,53(11):2240-2243
The superhyperfine structure of the EPR spectra of impurity Nd3+ and U3+ ions in LiYF4, LiLuF4, and LiTmF4 double-fluoride single crystals has been observed and discussed. In LiYF4: Nd (g
| = 1.987, g
⊥ = 2.554) and LiTmF4: Nd, the superhyperfine structure is observed at the orientation of the external magnetic field B in parallel to the c axis of the crystals and consists of nine components with a splitting of ∼15.4 MHz. In LiYF4: U (g
| = 1.149, g
⊥ = 2.508) and LiLuF4: U, the superhyperfine structure is observed at both B | c and B ⊥ c and consists of nine and eleven components, respectively, with a splitting of ∼21.5MHz. It should be noted that the resolution
of the superhyperfine structure of the EPR spectrum of LiLuF4: U3+ becomes significantly higher with a deviation from the orientation B ⊥ c. 相似文献
6.
L. K. Aminov A. A. Ershova S. L. Korableva I. N. Kurkin A. A. Rodionov B. Z. Malkin 《JETP Letters》2008,87(6):311-315
The observation of the superhyperfine structure (SHFS) in EPR spectra due to enhanced nuclear magnetism is reported. The X-band
spectrum of a U3+ ion introduced into the Van Vleck paramagnet LiTmF4 is measured in the temperature range of 5–20 K and compared with the spectra of LiLuF4:U3+ and LiYF4:U3+ single crystals. The spectra reveal well-resolved and strikingly different SHFS. The SHFS of Li(Lu, Y)F4:U3+ is due to the fluorine ions forming the nearest surroundings of the U3+ ion. The main contribution to the SHFS of the U3+ spectrum in LiTmF4 comes from the Tm3+ ions with a highly enhanced nuclear gyromagnetic tensor.
The text was submitted by the authors in English. 相似文献
7.
This publication is a continuation of works devoted to problems that arise in heterogeneous technologies. The matter of parameters
that define the transition from surface erosion to particle spraying onto the surface is addressed. In particular, we experimentally
examine the influence of temperature of the supersonic heterogeneous flow (carrier-gas temperature and particle temperature)
interacting with the streamlined obstacle on the occurrence probability of either surface damage or particle spraying.
This work was supported by the Russian Foundation for Basic Research (Grant No. 05-02-16603). 相似文献
8.
9.
V. M. Ivanov A. M. Mamedova V. N. Figurovskaya N. I. Ershova Yu. A. Barbalat Chin’ Tkhi Tuet Mai 《Journal of Analytical Chemistry》2006,61(6):571-575
Optical and colorimetric characteristics of 1-nitroso-2-naphthol-3,6-disulfonic acid (nitroso-R-salt) are studied in aqueous solutions at pH 4–10. Equations of calibration plots are obtained as the colorimetric functions of the concentration, and the molar coefficients of the colorimetric functions are calculated. The dissociation constants of nitroso-R-salt are determined by colorimetry at an ionic strength of 0.1–0.5, reduced to zero ionic strength, and compared with the literature data. Advantages of colorimetry over spectrophotometry in the determination of the dissociation constants of colored reagents are demonstrated. 相似文献
10.
S. S. Novikov V. M. Belikov A. A. Fainzil'berg L. V. Ershova V. I. Slovetskii S. A. Shevelev 《Russian Chemical Bulletin》1959,8(10):1773-1776
Summary On the basis of determinations of dissociation constants and a study of the spectra of eleven dinitroalkanes it was shown that there is a direct correlation between the acid character and the frequencies of C-H vibrations in the series of compounds RCH(NO2)2. A relation has therefore been found between the acid characters of these nitro compounds and their spectrum characteristics. 相似文献