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排序方式: 共有169条查询结果,搜索用时 15 毫秒
1.
A. A. Nikitin O. V. Zausova N. V. Titova A. B. Shapovalov E. B. Vlasova L. A. Popova 《Glass and Ceramics》2007,64(9-10):373-374
The possibility of using the granulated form of biocompatible material made of calcium-phosphate glass ceramic BGC for treatment of maxillary cysts was demonstrated. 相似文献
2.
Irina A. Stenina Polina A. Yurova Tatyana S. Titova Marina A. Polovkova Oleg V. Korchagin Vera A. Bogdanovskaya Andrey B. Yaroslavtsev 《应用聚合物科学杂志》2021,138(27):50644
Nafion-117/PEDOT composite membranes were synthesized by in situ chemical polymerization of 3,4-ethylenedioxythiophene (EDOT) using ammonium persulfate as an oxidant. The polymerization of EDOT in Nafion membranes for various EDOT/oxidant treatment sequences was studied for the first time. PEDOT introduction leads to a slight decrease in both the ion-exchange capacity and water uptake of the composite membranes, as well as to an increase in cationic transport. Membranes initially treated with an oxidant exhibit better conductivity and lower hydrogen permeability. The effect of both modification of Nafion-117 membranes by PEDOT and hot-pressing of hydrogen-oxygen membrane-electrode assemblies (MEAs) on the performance of proton-exchange membrane fuel cells was studied. The maximum power density of the fabricated MEAs increases 1.5-fold: from 510 (for a pristine Nafion-117 membrane) to 810 mW cm−2 (for a membrane modified by PEDOT). The current density at a voltage of 0.4 V reaches 1248 and 2246 mA cm−2, respectively. 相似文献
3.
K. O. Titova G. I. Kotel’nikov K. A. Zubarev K. V. Grigorovich 《Steel in Translation》2016,46(12):831-835
In Ni–Cu alloys, iron must be excluded in many cases. Iron may enter the alloy from the batch or the furnace lining. Since the Fe2O3 content in refractories may be as much as 2.5%, it is important to assess the increase in iron content in alloys on account of interaction with the furnace lining. In the present work, the influence of the Fe2O3 content in the crucible and the volume of the crucible on the iron content in the final alloy is studied. Thermodynamic analysis and experimental data indicate that the nickel and copper in Ni–Cu alloys may reduce iron that is present in the lining. When using low-iron batch, iron from the crucible is transferred almost completely to the melt. The increase in iron content in Ni–Cu alloys is investigated as a function of the capacity of the vacuum induction furnace and the Fe2O3 content in the periclase crucibles, with complete transfer of the iron from the lining to the melt. With increase in furnace capacity, less iron enters the melt from the crucible. With more than 200 kg of metal, the increase in iron concentration mainly depends not on the furnace capacity but on the Fe2O3 content in the refractory. In order to produce Ni–Cu alloys with <0.01% Fe, refractories with Fe2O3 content no higher than 0.5% must be used. To produce Ni?Cu alloys with <0.05% Fe, the use of lining refractories with Fe2O3 content no higher than 2.5% is recommended. 相似文献
4.
Ekaterina A. Karpyuk Oksana I. Titova Alexander V. Pastukhov Vadim A. Davankov Sergei I. Kargov 《溶剂提取与离子交换》2016,34(4):362-374
Three samples of carboxylic acid gel-type cross-linked polyelectrolytes were examined by registering the extent and kinetics of their volume change depending on the temperature, concentration, and nature of external electrolyte solutions, as well as the initial state (ionic form, water content) of the bead. It is found that in some systems the swelling of the bead (as a result of lowering the temperature) proceeds much more slowly than the preceding shrinking (as a result of the increase of temperature). Moreover, the initial volume of the bead is not restored, and a new stationary state of swelling is established. By means of optical dilatometry, it is found that in the systems in which the differences in the stationary states of swelling are found, the beads display plasto-elastic properties, whereas in the absence of such differences the beads show elastic properties. It is found that different stationary states of swelling are also established when the beads of copolymer of methacrylic acid cross-linked with divinylbenzene in Na+ form in the dry state and in the NaCl solution-swollen state are placed into a solution of a divalent cation salt. The difference in the stationary states of swelling reaches 12% in 4 N NiCl2 solution. The substantial differences in the swelling behavior and viscoelastic properties of the resins in their Na+, Mg2+, Ca2+, and Ni2+ forms are interpreted in terms of formation of different kinds of complexes of functional groups of the polymer with Ca2+ and Ni2+ ions. 相似文献
5.
Yu. V. Blinova L. A. Cherepanova T. P. Krinitsina E. I. Kuznetsova S. V. Sudareva S. G. Titova S. V. Pryanichnikov M. V. Degtyarev E. P. Romanov 《The Physics of Metals and Metallography》2016,117(2):151-159
The crystal structure of the high-temperature Y1–xCaxBa2Cu3O6.8 superconductor has been studied in a temperature range of 80–300 K using low-temperature X-ray diffraction analysis; its microstructure has been studied by scanning and transmission electron microscopy. Changes of the bond length in the structure of principal phase and precipitation topology of impurity phases and their compositions have been analyzed. An addition of calcium was shown to increase the environmental tolerance of the principal Y123 phase and its microhardness and ensures the low unchanged coefficient of thermal expansion. All of the facts indicate that the material can be used to manufacture composite superconducting articles. 相似文献
6.
Tsivadze A. Yu. Fridman A. Ya. Averin A. A. Shabanov M. P. Morozova E. M. Petukhova G. A. Novikov A. K. Bardyshev I. I. Polyakova I. Ya. Gorbunov A. M. Titova V. N. Yavich A. A. 《Protection of Metals and Physical Chemistry of Surfaces》2019,55(6):1071-1079
Protection of Metals and Physical Chemistry of Surfaces - A systematization is presented of studies of carbon sorbent functionalization based on chemical modification of the active carbon surface... 相似文献
7.
G. D. Kozak I. S. Zhukov U. O. Titova A. N. Tsvigunov 《Combustion, Explosion, and Shock Waves》2010,46(5):589-592
The explosive transformation of mixtures of HMX and benzoyl peroxide with aluminum was studied. Aluminum oxides formed during initiation of an impact explosion were investigated. An x-ray analysis showed that aluminum is not oxidized during explosion of its mixtures with benzoyl peroxide. An analysis was made of aluminum oxides formed during explosion of HMX mixtures with aluminum hydride and ternary mixtures of aluminum, HMX, and benzoyl peroxide. It was found that the state of aluminum introduced into the composition and the explosion temperature influence the structure of aluminum oxide (Al8/3O4), whose lattice is a derivative of the spinel lattice. 相似文献
8.
A. M. Starik N. S. Titova A. S. Sharipov V. E. Kozlov 《Combustion, Explosion, and Shock Waves》2010,46(5):491-506
A comprehensive analysis of synthesis gas (syngas) oxidation kinetics in wide ranges of temperature, pressure, fuel-to-air equivalence ratio, and fuel composition is performed on the basis of the reaction mechanism of syngas ignition and combustion in air. A vast set of experimental data on the ignition delay time, laminar flame propagation velocity, and time evolution of mole fractions of the basic species, which were obtained in shock tubes and in a flow reactor, is used for verification of the kinetic model. Based on a sensitivity analysis, it is shown that the role of reactions determining the basic characteristics of ignition and combustion depends on the composition of the fuel-air mixture and the syngas proper. 相似文献
9.
A detailed kinetic model of propane ignition and combustion in air is developed. The model includes 599 reactions with 92 species and involves both the high-temperature and low-temperature mechanisms of oxidation. The model is tested against experimental data on the ignition delay time, on propane conversion during low-temperature oxidation, on changes in species concentrations during propane pyrolysis, and on laminar flame propagation velocity. The model is tested in wide ranges of the initial temperature T 0 = 680–1900 K, pressure p 0 = 0.17–30 atm, and fuel-air equivalence ratio ϕ = 0.13–2. 相似文献
10.