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1.
I. A. Uspenskaya Z. S. Vakhovskaya M. M. Efremova M. L. Kovba A. L. Emelina Zh. V. Dobrokhotova Yu. V. Goryushkina L. A. Tiflova A. A. Popova A. S. Monaenkova 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2006,80(4):529-534
The thermodynamic properties of the Ln2BaO4 phases (Ln = Dy, Ho, Sm) were studied by the electromotive force method with a fluoride electrolyte (890–1180 K), solution calorimetry in 1.07 N hydrochloric acid at 298.15 K, and differential scanning calorimetry (298–860 K). The experimental data were jointly processed, and the thermodynamic functions of the compounds over the temperature range 298–1200 K were calculated. 相似文献
2.
Z. M. Yaremko D. M. Nikipanchuk L. B. Fedushinskaya I. G. Uspenskaya 《Colloid Journal》2001,63(2):253-258
Based on an analysis of interparticle interaction in highly disperse powders, a parameter is suggested allowing one to evaluate the tendency of dispersed particles to the formation of aggregates, the aggregation coefficient. It was shown that the particles of metal oxide powders with radius smaller than 10 m are present in their aggregated state. It was found that redispersion of highly disperse titanium dioxide powder in the aqueous medium is incomplete. The incomplete redispersion may be caused by the roughness of particles and/or the formation of the regions of entrapped air that are not destroyed by capillary pressure. 相似文献
3.
Kabakova M. M. Uspenskaya M. V. Sirotinkin N. V. Sanatin E. V. 《Russian Journal of Applied Chemistry》2003,76(7):1176-1178
The equilibrium swelling of new hydrogels based on sodium acrylate and N,N-methylenebisacryl- amide modified with 5-vinyltetrazole in water and aqueous solutions of nickel salts in the stage of radical polymerization was studied. The influence of 5-vinyltetrazole concentration in the monomer mixture on the characteristics of the resulting copolymers was studied. 相似文献
4.
Alexandra P. Pleshkova Marina N. Uspenskaya Sergei V. Volkovitch 《Journal of mass spectrometry : JMS》1994,29(1):26-29
New examples of the ortho effect in bisphenol A derivatives including interaction of the hydrogen of the ortho-hydroxy group with the neighbouring aromatic ring have been observed. The characteristic ions [M ? PhOH]+middot; (m/z = 134) and [M ? CH3 ? PhOH]+ (m/z = 119) were shown to form through the hydrogen transfer from hydroxy and isopropyl groups, respectively. The spectra of cyclic derivatives having ortho-hydroxy functions show [M ? 43]+, [M ? C8H9O]+, m/z = 147, m/z = 135 and [M ? C9H10O]+ ions. The proposed mechanims of the corresponding transformations were supported by mass spectra of deuterated analogues, methyl and trimethyl silyl ethers. 相似文献
5.
T. P. Kofman N. Yu. Medvedeva T. L. Uspenskaya M. S. Pevzner 《Chemistry of Heterocyclic Compounds》1977,13(9):1026-1029
Ketones of the 3-nitro-5-R-1,2,4-triazole series react with hydrazoic acid in concentrated sulfuric acid to give triazolyl-substituted acetamides. Acid hydrolysis of the latter leads to 1-aminoalkyl-3-nitro-5-R-1,2,4-triazoles. Intramolecular cyclization with the elimination of HNO2 and the formation of 2-nitro-5,6-dihydro-1H-imidazo[2,3-b]-1,2,4-triazole was noted in the case of 1-(2-aminoethyl)-3,5-dinitro-1,2,4-triazole.See [1] for communication XX.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1271–1273, September, 1977. 相似文献
6.
Magnetometry data on 5- to 40-nm-thick PdFe films are presented for the first time. It is found that the decrease in the film thickness leads not only to the lowering of the temperature of the transition from the paramagnetic to ferromagnetic state and to the decrease in the saturation magnetization but also to the drastic changes in the film properties. In particular, the type of the temperature dependence of magnetization changes, the Curie temperature becomes strongly dependent on the applied magnetic field, and two transition temperatures are observed in zero magnetic field. The observed effects are attributed to the transition from the three-dimensional distribution of ferromagnetic clusters arising around impurity iron atoms to the two-dimensional one and can be treated within the model of impurity magnetism suggested by Korenblit and Shender. 相似文献
7.
Z. R. Musaeva N. A. Vybornov V. K. Karpasyuk A. M. Smirnov L. S. Uspenskaya S. Kh. Yazenkov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2007,1(4):423-427
The structure and phase composition of La0.65Sr0.35Mn1 ? x ? y NixTiyO3 manganites (0 ≤ x ≤ 0.3; 0 ≤ x + y ≤ 0.3) obtained by solid-state reactions in air are studied by x-ray diffraction. All the samples are single-phase materials and have an orthorhombic or pseudocubic structure, depending on the chemical composition and the sintering temperature. The saturation magnetization and the temperature dependences of the magnetic susceptibility are measured. The magnetic structure of manganites is characterized by the existence of inhomogeneities in the form of ring domains or drops whose size is in the range 30–100 μm. A study of the surface by scanning tunneling microscopy reveals the occurrence of ring, spiral, or lamellar structures with a characteristic size of the order of 10 nm. A possible approach to the interpretation of the obtained experimental results based on the concept of self-organization processes leading to the segregation of ion pairs and the formation of elastic concentration domains is discussed. 相似文献
8.
9.
L. S. Uspenskaya 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(5):711-713
The kinetics of remagnetization after magnetic field switching was studied by the magneto-optic visualization technique in
the bilayer hybrid structure composed of exchange-coupled FeNi and FeMn films. It was observed that not only the static but
the dynamic characteristics of remagnetization as well depend on the polarity of a field applied along the direction of easy
magnetization. The rate of the process was found to be exponentially dependent on the field strength in both directions, but
the rate varied by factors of 10 upon inversion of the field. It was shown that this difference is the consequence of variation
of both the time of domains nucleation and the velocity of domain walls motion. 相似文献
10.
L. S. Uspenskaya T. Nurgaliev B. Blagoev T. Donchev S. Miteva 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(4):540-542
The change in the magnetic domain structure due to the proximity of a superconductor has been experimentally investigated for the first time. The complex character of magnetization reversal at temperatures below critical, caused by the mutual long-range effect of a superconductor and a magnet, has been shown. In particular, it is found that even magnetization reversal of the heterostructure by an in-plane field leads to the formation of Abrikosov vortices in the superconductor, carrying a flux perpendicularly to the film plane. It is shown that this is a consequence of the transformation of narrow domain walls into wide stripes due to the interaction with scattering fields from the superconductor. In turn, after penetration of the magnetic flux into the superconductor at some depth, the scattering fields cause backward magnetization reversal of the external film edge, as a result of which vortices with oppositely directed fluxes enter the crystal and propagate in the superconductor bulk in the form of chains along twins, as in the case of magnetization by a perpendicular magnetic field. Thus, at longitudinal magnetization, the flux enters the superconducting film in the form of wide stripes with alternating perpendicular induction, which is explained by the long-range interaction of the scattering fields of the superconductor with the manganite magnetization. 相似文献