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1.
Journal of Experimental and Theoretical Physics - The studies of the topological properties of systems have recently been extended due to a new concept of higher-order topological insulators and... 相似文献
2.
A. I. Fedoseev S. G. Lushnikov S. N. Gvasaliya S. Kojima 《Physics of the Solid State》2006,48(6):1102-1105
The behavior of acoustic phonons in crystals of a relaxor ferroelectric, namely, the lead scandium tantalate PbSc1/2Ta1/2O3 (PST), is studied in the vicinity of the diffuse phase transition. The behavior of longitudinal and transverse acoustic phonons in a PST single crystal is examined using Brillouin scattering. The phonon subsystem is found to behave anomalously in the vicinity of T = 297 K, which can probably be assigned to the existence of a phase transition. Analysis of the results obtained yields the values of the elastic moduli C11, C12, and C44 for the cubic phase of the crystal over a wide temperature range. 相似文献
3.
4.
E. N. Fedoseeva A. V. Budruev L. A. Smirnova Yu. D. Semchikov V. B. Fedoseev 《Polymer Science Series A》2007,49(8):868-875
It has been shown that the interaction of chitosan and oligochitosan with unsaturated acrylic esters via the nucleophilic addition mechanism and their condensation with heptadecyl isocyanate yield hydrophobic alkyl-containing derivatives of the above polymers. The method of modification of oligochitosan in reactions via end functional groups is developed. 相似文献
5.
Fedoseev A. M. Budantseva N. A. Andreev G. B. Yusov A. B. Shirokova I. B. 《Russian Journal of Coordination Chemistry》2002,28(4):279-284
The reactions of some rare-earth elements (La, Ce, Sm, Lu, Gd) and Am(III) with heteropolymolybdate anions are studied. The complexation rate constants of Am(III) in a solution with Al(OH)6Mo6O18
3- and Cr(OH)6MoO18
3-
6 (1 = 18 ± 6 and 25 ± 5, respectively) are determined by spectral methods. The Ln[Al(OH)6Mo6O18] · nH2O, Eu[Cr(OH)6Mo6O18] · nH2O, and Am[Al(OH)6Mo6O18] · nH2O isostructural compounds are synthesized. The crystal structure of the Sm[Al(OH)6Mo6O18] · 11H2O complex was determined by the X-ray diffraction analysis. The results of spectroscopic and thermogravimetric studies of the obtained compounds are presented. 相似文献
6.
A. A. Mandrugin V. M. Fedoseev O. V. Dubovaya A. A. Rodyunin M. N. Semenko 《Chemistry of Heterocyclic Compounds》2002,38(11):1382-1388
The opening of the thiazoline ring upon the action of amino alcohols was studied. The effects of the reagent ratio and structures of the heterocycles and amino alcohols on aminolysis were investigated. A new method was developed for the preparative synthesis of a series of N'-(hydroxyalkyl)-2-guanidinoalkanethiols. 相似文献
7.
Yusov A. B. Fedoseev A. M. Astafurova L. N. 《Russian Journal of Coordination Chemistry》2002,28(4):264-271
The interaction of Np(VI), Pu(VI), Np(V), Np(IV), Pu(IV), Nd(III), and Am(III) with Al(III) in solutions at pH 0–4 was studied by the spectrophotometric method. It was shown that, in the range of pH 3–4, the hydrolyzed forms of neptunyl and plutonyl react with the hydrolyzed forms of aluminium. In the case of Pu(VI), the mixed hydroxoaqua complexes (H2O)3PuO2(-OH)2Al(OH)(H2O)3
2+ or (H2O)4PuO2OAl(OH)(H2O)4
2+ are formed at the first stage of hydrolysis. Np(VI) also forms similar hydroxoaqua complexes with Al(III). The formation of the mixed hydroxoaqua complexes was also observed when Np(IV) or Pu(IV) was simultaneously hydrolyzed with Al(III) at pH 1.5–2.5. The Np(IV) complex with Al(III) has, most likely, the formula (H2O)
n
(OH)Np(-OH)2Al(OH)(H2O)3
3+. At pH from 2 to 4.1 (when aluminium hydroxide precipitates), the Np(V) or Nd(III) ions exist in solutions with or without Al(III) in similar forms. When pH is increased to 5–5.5, these ions are almost not captured by the aluminium hydroxide precipitate. 相似文献
8.
V. M. Mirovich V. A. Peshkova R. K. Shatokhina A. P. Fedoseev 《Chemistry of Natural Compounds》1989,25(6):722-723
Irkutsk Medical Institute. Translated from Khimiya Prirodnykh Soedinenii, Vol. 6, pp. 850–851, November–December, 1989. 相似文献
9.
I. A. Charushnikova A. M. Fedoseev Z. A. Starikova 《Russian Journal of Coordination Chemistry》2005,31(8):603-607
The crystal structure of Na3NpO2(OOCCH3)3ClO4 · H2O was studied by single-crystal X-ray diffraction method. The structure is composed of the complex anions NpO2(OOCCH3)3]2−, perchlorate anions, Na cations, and water molecules. The oxygen environment of Np(V) is a hexagonal bipyramid whose equatorial plane is formed by the oxygen atoms of three acetate ions. In addition to the acetate anions, the structure contains the perchlorate ion whose oxygen atoms, except for one, are included in the coordination environment of Na+ cations.__________Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 8, 2005, pp. 636–640.Original Russian Text Copyright © 2005 by Charushnikova, Fedoseev, Starikova. 相似文献
10.
Fedoseev S. V. Belikov M. Yu. Ershov O. V. Tafeenko V. A. 《Russian Journal of Organic Chemistry》2020,56(9):1540-1544
Russian Journal of Organic Chemistry - Heating of 2-halopyridine-3,4-dicarboxylic acids in propionic anhydride led to the formation of 4-halofuro[3,4-c]pyridine-1,3-diones as a result of... 相似文献