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排序方式: 共有121条查询结果,搜索用时 15 毫秒
1.
P. D. Kim I. A. Turpanov S. V. Stolyar R. S. Iskhakov V. I. Yushkov A. Ya. Beten’kova L. A. Li E. V. Bondareva T. N. Isaeva M. M. Karpenko 《Technical Physics》2004,49(4):431-434
The crystal structure and hysteretic magnetic properties of equiatomic single-crystal CoPt films applied on MgO substrates
by magnetron sputtering, as well as modification of these properties by thermal annealing, are studied. Heat-treated films
of thickness in the range 2<d≤16 nm exhibit perpendicular magnetic anisotropy. A correlation between the crystalline anisotropy constant of the CoPt films
and the order parameter of the LI0 superstructure in these alloys is found. The effect of a single-crystalline MgO substrate on the structure and magnetic properties
of equiatomic CoPt films is revealed. 相似文献
2.
Panasyugin A. S. Rat'ko A. I. Bondareva G. V. 《Russian Journal of Applied Chemistry》2002,75(11):1824-1827
The sorption properties of mixed adsorbent-catalyst based on high-silica zeolite and montmorillonite modified with mixed oxides of Cr(III) and Cu(II) with respect to organic compounds of various classes were studied, and the optimal dynamic conditions of its operation were determined. 相似文献
3.
Institute Crysallography, Academy of Sciences of the USSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 4, pp. 173–175, July–August, 1991. 相似文献
4.
V.M. Bondareva T.V. Andrushkevich O.B. Lapina A.A. Vlasov L.S. Dovlitova 《Reaction Kinetics and Catalysis Letters》2003,79(1):165-173
Vanadium-titanium catalysts modified with phosphorus additives (1-15 wt.% of P2O5) have been studied in methylpyrazine ammoxidation. Introduction of high amounts of the additive (≥ 10 wt.% of P2O5) results in a decrease in activity and selectivity of the catalysts due to formation of low active phase - a ternary compound
with the component ratio V : P : Ti ≈ 1 : 1 : 1 with only one type of slightly distorted tetrahedral vanadium (5+) bound via
oxygen to phosphorus (5+). The nature of the active sites of the samples modified with 1-5 wt.% of P2O5, similarly to that in the V-Ti-O catalyst, was found to include the V5+ cations strongly bound with TiO2 and located in the significantly distorted octahedral oxygen environment.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
5.
Bondareva V. M. Andrushkevich T. V. Lapina O. B. Khabibulin D. F. Vlasov A. A. Dovlitova L. S. Burgina E. B. 《Kinetics and Catalysis》2004,45(1):104-113
Oxide vanadium–titanium catalysts modified by phosphorus additives (20V2O5–(80 –n)TiO2–nP2O5, n = 1, 3, 5, 10, and 15 wt %) are studied in methylpyrazine ammoxidation. Two regions of compositions are found corresponding to radically different catalytic properties, namely, catalysts with a low (5 wt % P2O5) and high (10 wt % P2O5) concentration of the additive. In the first case, the introduction of phosphorus is accompanied by a gradual increase in the activity. In the second case, an increase in the additive concentration results in a decrease in the activity and selectivity to the target product, pyrazineamide, and a simultaneous increase in the selectivities to by-products, pyrazine and carbon oxides. The catalysts are characterized by X-ray diffraction analysis, differential dissolution, IR, and NMR spectroscopic data. As in the binary system, the active sites of the samples with a low concentration of phosphorus contain V5+ cations in a strongly distorted octahedral oxygen environment, which are strongly bound to a support due to the formation of V–O–Ti bonds. The catalytic properties of the samples containing 10 wt % P2O5 are due to the presence of the phase of a triple V–P–Ti compound with an atomic ratio V : P : Ti approximately equal to 1 : 1 : 1. The V5+ cations in this compound occur in a weakly distorted tetrahedral oxygen environment and are bound to the tetrahedral P5+ cations. 相似文献
6.
S. O. Bondareva V. V. Lisitskii N. I. Yakovtseva Yu. I. Murinov 《Russian Chemical Bulletin》2004,53(4):803-807
The kinetics of hydrolysis of 1,2-disubstituted imidazolines in aqueous media was studied (pH 2.0—12.5, T = 25—90 °C) by UV spectroscopy. The hydrolysis products were identified. The introduction of a branched substituent into position 2 of the imidazoline ring increases the hydrolytic stability of the compounds. The effect of the pH on the hydrolysis rate of imidazolines is discussed. 相似文献
7.
V. M. Bondareva T. V. Andrushkevich Yu. D. Pankratiev V. M. Turkov 《Reaction Kinetics and Catalysis Letters》1986,32(2):371-376
Adsorption heats of acrolein and acrylic acid on promoted V–Mo–O catalysts for selective oxidation of acrolein have been measured by the calorimetric technique. It has been established that modification changes the energy characteristics of the interaction of acrolein and acrylic acid with catalyst surface.
- . , .相似文献
8.
Reshetnikov D. V. Burova L. G. Rybalova T. V. Bondareva E. A. Patrushev S. S. Evstropov A. N. Shults E. E. 《Chemistry of Natural Compounds》2022,58(5):908-915
Chemistry of Natural Compounds - Cross-coupling of 8-bromocaffeine, 8-bromo-1-butyltheobromine, or 8-bromo-7-butyltheophylline with α-, β-, or ω-amino-acid methyl or t-butyl ester... 相似文献
9.
A. L. Bondareva G. I. Zmievskaya 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2010,4(3):480-487
Progress in extreme UV lithography depends on the quality of multilayer radiation collecting mirrors (made of Mo/Si), in which
radiation damage can cause porosity. Accumulation of bulk defects (blisters) is represented by the model of the first order
phase transition at a fluctuation stage. Computer simulation of defect distribution functions depending on the sizes and arrangement
in layers allows the determination of possible ways for the properties of the layer material properties to deteriorate. 相似文献
10.
E. V. Grigorova L. P. Bondareva A. V. Kadantsev Yu. A. Byval’tsev V. V. Khripushin T. S. Kornienko 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(9):1636-1639
A calorimetric unit for measurements of the thermal effects of reactions in solution was created. The unit was designed following
the classic scheme of a hermetic liquid calorimeter working under isoperibolic conditions, it had a thermometric sensitivity
of 10−4 K and a calorimetric sensitivity of 10−2 J. The accuracy of calorimeter operation was checked against the heats of solution of potassium chloride. The molar integral
enthalpies of solution of glycine in water at 298 K were determined. 相似文献