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1.
E. N. Selivanov V. M. Chumarev R. I. Gulyaeva V. P. Mar'evich A. D. Vershinin A. A. Pankratov E. S. Korepanova 《Inorganic Materials》2004,40(8):845-850
The iron calcium oxysulfides Ca3Fe4S3O6 and CaFeSO are synthesized by reacting mixtures of CaO and FeS in an inert atmosphere. Their elemental compositions and lattice parameters are determined by x-ray microanalysis and x-ray diffraction. From the temperature-dependent lattice parameters of the oxysulfides (measured up to 1020 K), their thermal expansion coefficients are evaluated. 相似文献
2.
A. G. Upolovnikova V. M. Chumarev R. I. Gulyaeva L. Yu. Udoeva 《Russian Metallurgy (Metally)》2007,(1):10-13
The effect of sodium carbonate additions on phase formation during the air oxidation of the sublimates of niobium electron-beam remelting is studied by derivatography, X-ray diffraction analysis, and electron-probe microanalysis. The composition of the oxidation products changes with the heating temperature. The formation of sodium niobates and aluminates is detected by X-ray diffraction analysis at temperatures higher than 600°C. The oxidation of the sublimates is completed by the formation of sodium metaniobate and aluminate. Sodium carbonate additions are shown to accelerate the oxidation of the sublimates. 相似文献
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A. B. Lysenko N. N. Kozina T. V. Gulyaeva V. V. Shibaev A. G. Glushkov 《Metal Science and Heat Treatment》1991,33(3):169-172
1. | In all the investigated steels saturation with boron leads to the formation of a heterophase structure characterized by dispersity of the structural components, chemical and structural inhomogeneity. In a thin surface layer of the treated zone metallography reveals molten boron particles which did not have time to react with the liquid metal. |
2. | In dependence on the marque of steel the boronized layers have different phase composition, and in addition to - and -solid solutions they contain iron boride Fe2B and also complex boron carbides with different stoichiometric composition. Metastable crystalline phases were not discovered in the investigated specimens. |
3. | Laser boronizing increases microhardness because of the more complex phase composition as well as other changes of the structure connected with the high cooling rates of the alloyed layers. |
6.
A new procedure is presented for the synthesis of diagonal compensators for N × N linear multivariable systems that are free of fixed modes with respect to constant diagonal output feedbacks. The synthesis procedure employs simple polynomial algebra and it is in the form of an N-step algorithm. The geometric configurations 2N- and 2N-cells in N-space are shown to be especially suitable for visualizing diagonal feedback and aiding the application of the synthesis algorithm. 相似文献
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E. N. Selivanov R. I. Gulyaeva L. Yu. Udoeva V. V. Belyaev A. A. Pankratov 《Russian Metallurgy (Metally)》2009,(4):281-288
The effect of the cooling rate on the phase composition and microstructure of copper matte converting slags is studied by
X-ray diffraction, combined thermogravimetry and calorimetry, mineragraphy, and electron-probe microanalysis. The compositions
of oxide and sulfide phases are determined, and the forms of nonferrous metals in slags cooled at a rate of 0.3 and 900°C/s
are revealed. At high cooling rates of the slags, iron silicate glass is shown to form apart from sulfide phases. Repeated
heating of the slags leads to the development of devitrification, “cold” crystallization, and melting. A decrease in the cooling
rate favors an increase in the grain sizes in oxides (magnetite, iron silicates) and sulfides (bornite-, sphalerite, and galena-based
solid solutions). 相似文献
8.
V. A. Chumachenko A. V. Lavrenov E. A. Buluchevskii A. B. Arbuzov T. I. Gulyaeva V. A. Drozdov 《Catalysis in Industry》2016,8(1):56-74
Catalysts based on metals (Pt, Pd) and metal oxides (NiO, Co3O4, MoO3, WO3), supported on the surface of borate-containing aluminum oxide (B2O3–Al2O3), in the hydrocracking of sunflower oil at a temperature of 400°C, a pressure 4.0 MPa and a mass hourly space velocity MHSV 5.0 h–1 are compared. H2 TPR and IR spectroscopy of adsorbed CO and ESDR show that the hydrogenation catalyst components are Pt0 and Pd0, a mixture of Ni2+ + Ni0, Co2+ + Co0, or a mixture of the highest and partially reduced oxides of Mo and W. It is established that catalysts containing Pt, Pd, NiO and Co3O4, ensure complete oil hydrodeoxygenation. The main oxygen removal reactions in Ptand Pd-systems are decarboxylation and hydrodecarbonylation. For catalysts with NiO and Co3O4, characteristic reactions are reduction and methanation. The highest yield of the diesel fraction was obtained on Pt/B2O3-Al2O3 catalysts with metal contents of 0.3–1.0 wt %. Along with n-alkanes, the diesel fractions obtained on these catalysts include cycloalkanes and iso-alkanes (up to around 40 wt %) and aromatic hydrocarbons present in trace amounts. Hydrocracking on the Pt system at 400°C for 20 h with MHSV of 1.0 h–1 produces a diesel fraction with a yield of at least 82.0 wt % and the content of iso-alkanes at least 76.1 wt %. 相似文献
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