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排序方式: 共有242条查询结果,搜索用时 15 毫秒
1.
V. A. Babenko V. V. Grigor’yants I. P. Shilov 《Journal of Communications Technology and Electronics》2006,51(6):618-630
Basic definitions related to the main electrodynamic characteristics of surface space-charge waves are formulated. These characteristics and their relationships with the geometric dimensions of guiding structures (a dielectric cylinder and a planar metal-dielectric waveguide) are determined. 相似文献
2.
V. V. Shilov Yu. P. Gomza V. N. Bliznyuk Yu. S. Lipatov D. B. Boguslavsky V. L. Pikalov Z. F. Suvorova 《应用聚合物科学杂志》1985,30(5):1927-1934
The structural peculiarities of cis-1,4-isoprene rubber, oligodiene diisocyanate, and derivative of phenol–formaldehyde resin blends have been studied by WAXS and SAXS methods and electron microscopy. It has been demonstrated that the addition of modifiers and further thermal treatment under conventional curing conditions change considerably the microheterogeneous structure and morphology and contribute to the improvement of the short-range order in the rubber matrix. 相似文献
3.
Published data on the preparation procedures, stability, and complexation of U(III) in aqueous solutions are summarized and correlated. Reactions with inorganic and organic free radicals studied by the flash radiolysis method, the spectroscopic properties, the extraction and ion-exchange behavior of U(III), and methods for isolation of solid U(III) compounds from aqueous solutions are discussed. 相似文献
4.
Behavior of hydrated 238-242Pu(IV) oxide in 0.09-0.9 M NaOH containing 1 ×10-
3 M Na2SiO3 and in 0.1-0.2 M NaClO4 containing 1×10-
3-0.09 M Na2SiO3 (pH 11 and 9) was studied radiometrically with the aid of a scintillation counter. In alkaline solutions with pH 13.8-11 and high Na2SiO3 content, the Pu(IV) solubility increases owing to the reaction Pu(IV) + nSiO3
2
- = PuI
V(SiO3
2
-)
n
. At pH 9, Na2SiO3 has virtually no effect on the Pu(IV) solubility. 相似文献
5.
Catalysts Pt/SiO2 with different size of Pt nanoaggregates were studied in catalytic reduction of U(VI) with hydrazine in solutions of H2SO4, HClO4, and HNO3. The catalytic activity of the surface Pt atoms of Pt/SiO2 in this reaction monotonically increases with an increase in the size of metal crystallites on the support, i.e., the negative size effect is observed. Catalytic reduction of U(VI) with hydrazine in H2SO4 solutions is significantly faster than in HClO4 and HNO3, and in HClO4 it is slightly faster than in HNO3. The results were interpreted within the framework of the concept of the energetic nonuniformity of the surface atoms and of the mechanisms of catalytic reduction of U(VI) with hydrazine in acid solutions. 相似文献
6.
A. V. Shilov P. V. Matveev T. A. Feoktistova K. A. Polyakov A. E. Polyakov 《Fibre Chemistry》2007,39(3):245-246
An automatic control system for spinning and winding of synthetic fibres that provides for operation of the electric drive
of the metering pumps in conditions of stabilization of the melt pressure and rotation rate of the winder drive was proposed.
A laboratory bench that simulates operation of the device for controlling spinning and winding of synthetic fibres based on
software provided in a microcomputer was created. A parametric, adjustable, asynchronous electric drive from the KPE series
which provides for energy-saving conditions was used for the extruder drive.
__________
Translated from Khimicheskie Volokna, No. 3, pp. 56–57, May–June, 2007. 相似文献
7.
The stability of Np(VI) in 5–200 mM iminodiacetic acid (H2IDA) solutions at 23.5–55°С was studied by spectrophotometry. In a solution with pH 2 and excess Np(VI), 1 mol of H2IDA reduces 2 mol of Np(VI) to Np(V). In 1 and 0.5 M HClO4 solutions containing 200 mM H2IDA and 1 mM Np(VI), no more than 36 and 65% of Np(VI), respectively, is reduced at 44.5°С. Complete reduction of Np(VI) is observed in solutions containing 0.2 M HClO4 and less. In the examined ranges of H2IDA concentrations and temperatures, Np(VI) is consumed in accordance with the first-order rate law. The reduction mechanism involves formation of a Np(VI) iminodiacetate complex, which is followed by intramolecular charge transfer. The generated radical reduces Np(VI). The activation energy is 107 ± 3 kJ mol–1. 相似文献
8.
Oxidation of Np(V) to Np(VI) with xenon trioxide in a 0.5–1.4 M HClO4 solution was studied by spectrophotometry. The reaction rate is described by the equation–d[Np(V)]/dt = k[Np(V)][XeO3], where k = 4.6 × 10–3 L mol–1 s–1 in 1 M HClO4 at 92°С. The activation energy is close to 92 kJ mol–1. The activated complex is formed in contact of NpO 2 + and ХеО3 without participation of Н+ ions. The activated complex transforms into NpO 2 2+ and the products: ОН, Хе, and О2. The ОН radical oxidizes Np(V). Admixtures of Со2+ and especially Fe3+ accelerate the Np(V) oxidation. 相似文献
9.
A. V. Anan’ev M. Yu. Boltoeva L. M. Sharygin M. S. Grigor’ev V. P. Shilov 《Radiochemistry》2006,48(2):119-124
Platinized catalysts on various types of supports were tested in the catalytic decomposition of hydrazine in HClO4 and HNO3 solutions, where the process follows different pathways. In HClO4, the activity of the catalysts supported on a Termoksid ceramic material is higher than that of the catalysts supported on amorphous silica gel. In nitric acid solutions, the trend is reverse. Peptization of the ceramic supports in acid solutions increasing in the order 75% TiO2-25% SnO2 < 75% TiO2-25% ZrO2 ? TiO2 < ZrO2 was observed. In perchloric acid solutions, the catalyst specific activity in the hydrazine adsorption-dissociative decomposition increases with decreasing size of platinum crystallites on the support. In nitric acid solutions, where the hydrazine decomposition proceeds as its catalytic oxidation with nitric acid, the catalyst specific activity decreases with a decrease in the size of the catalyst crystallites, i.e., the catalyst centers located on large crystallites are more active. The results obtained were attributed to the energetic heterogeneity of the surface Pt atoms and various mechanisms of the hydrazine catalytic decomposition in various media. 相似文献
10.
Metallurgist - The variational principle of minimum total power and modern computational means are used to describe the deformation of metal in and to determine the power/force conditions for... 相似文献