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1.
The crystal structure of [NpO2{OC(NH2)2}5]ClO4·H2O and [NpO2Cl{OC(NH2)2}4] was studied by X-ray diffraction. The electronic absorption spectra of these complexes were recorded. The coordination polyhedron of Np in both complexes is a distorted pentagonal bipyramid. There is no cation-cation interaction of neptunyl cations in these complexes. 相似文献
2.
I. V. Smirnov E. S. Stepanova M. Yu. Tyupina N. M. Ivenskaya I. G. Tananaev S. R. Zaripov S. R. Kleshnina S. E. Solov’eva I. S. Antipin 《Radiochemistry》2017,59(4):365-371
The effect of γ-irradiation of tert-butylthiacalix[4]arene (TCA) solutions in m-nitrobenzotrifluoride (NBTF) and tetrachloroethylene (TCE) on the extraction of 241Am from alkaline carbonate solutions was studied. TCA itself remains stable upon γ-irradiation of its solutions in NBTF to a dose of 200 kGy, but the diluent undergoes strong degradation. The radiation resistance of TCA in TCE is considerably lower: A dose of 70 kGy causes complete degradation of TCA. In the TCA–TCE–aqueous phase system, sulfate ions appear upon γ-irradiation as the final product of the extractant radiolysis. A large number of γ-radiolysis products of TCE and TCA were detected by HPLC and GCMS. The products of radiolysis of TCA in TCE, compared to the initial extractant, have lower molecular mass and higher polarity. The results show that chlorinated diluents are not promising diluents for thiacalixarene in extraction processing of alkaline high-level waste. 相似文献
3.
The compound [Co(NH3)6][PuO2(C2O4)2] · 3H2O was studied by single crystal X-ray diffraction. The structure contains dimeric complex anions [PuO2(C2O4)2]
2
6−
in which the coordination polyhedra of the Pu atoms are distorted pentagonal bipyramids sharing a common equatorial edge.
In going from [Co(NH3)6] · [NpO2(C2O4)2] · 3H2O to [Co(NH3)6][PuO2(C2O4)2] · 3H2O, the An-O distances, both axial (in the actinyl group) and equatorial, decrease virtually isotropically.
__________
Translated from Radiokhimiya, Vol. 47, No. 5, 2005, pp. 419–422.
Original Russian Text Copyright ? 2005 by Grigor'ev, Antipin, Krot, Bessonov. 相似文献
4.
I. V. Sokolov A. A. Smirnov Yu. G. Antipin K. V. Baranovskii 《Journal of Mining Science》2016,52(1):121-128
High-rate ore drawing with a single drawpoint requires stable structure of the horizon bottom in block caving of ore. Application of load–haul–dumpers (LHD) conditions longer spacing of drawpoints, which worsens quality of ore drawing under caved rock. Adequate structures of trench bottoms of ore drawing levels are developed for LHD systems. Relations are set between the limit spacing of drawpoints along the length of the trench and the height of the caved level to define mutual influence of the drawpoints. 相似文献
5.
I. V. Sokolov A. A. Smirnov Yu. G. Antipin K. V. Baranovsky A. A. Rozhkov 《Journal of Mining Science》2016,52(6):1159-1167
The article describes the applied research findings on selecting a resource-saving technology to ensure drastic reduction in loss of high-grade Kyshtym quartz. The economical–mathematical modeling yields relationships between mine efficiency, ground conditions, mine design and technology factors, and the optimal variant of a combination mining technology is determined using the maximum profit criterion. Full-scale physical simulation of closed-spaced charge blasting effect on reduction in overgrinding of quartz is discussed. Drilling and blasting pattern for experimental breaking of quartz by explosions is determined. 相似文献
6.
V. I. Malinin E. I. Kolomin I. S. Antipin 《Combustion, Explosion, and Shock Waves》2002,38(5):525-534
A method for flame stabilization in a reactor for synthesis of metal oxides is developed by analyzing combustion of dispersions of metal powders. An experimental reactor designed to implement this method is described. Ignition and combustion of commercial aluminum powders (ASD-1 and ASD-4) in air were studied, and their reliable ignition and stable combustion in the reactor combustion chamber were confirmed. It is shown that efficient combustion of an aluminum–air mixture depends on powder dispersity, flow mixing conditions, and combustion chamber pressure. Key words: aluminum, powder, suspension, flame, stabilization, combustion, synthesis, oxide. 相似文献
7.
Sergei V. Kostjuk Alexei Yu. Dubovik Irina V. Vasilenkol Vyacheslav P. Mardykin Ludmila V. Gaponik Fyodor N. Kaputsky Lev M. Antipin 《Polymer Bulletin》2004,52(3-4):227-234
Summary
Quasiliving cationic polymerization of styrene was obtained in the system 2-phenyl-2-propano-/AlCl3·OBu2/Bu2O in a mixture of 1,2-dichloroethane and n-hexane (55:45 viv) at -15 °C. The molecular weights of the polymers (Mn) increased in direct proportion to the monomer conversion. However, the experimental Mns are essentially higher than theoretical ones, indicating that slow initiation relative to propagation takes place. The molecular weight distributions were broad (Mw/Mn2.5), probably due to the slow initiation and slow exchange between reversibly terminated and propagating species. 相似文献
8.
S. V. Alekseenko V. A. Antipin A. V. Cherdantsev S. M. Kharlamov D. M. Markovich 《Microgravity science and technology》2008,20(3-4):271-275
High-speed fluorescent visualization complex has been developed for quantitative investigation of the process of interaction of waves on liquid film in annular two-phase flow. Evolution of ripples on disturbance waves surface and disturbance waves coalescence are investigated. It is shown that all the ripples in presence of disturbance waves appear at the base of the back front of disturbance waves and then either decelerate, travel on substrate and are overtaken by the following disturbance wave or accelerate, grow and then disappear at the front of disturbance wave. The disappearance happens due to entrainment of liquid into the core of gas stream. Several scenarios of coalescence of disturbance waves were identified. For disturbance waves with close velocities different types of remote interaction were observed. 相似文献
9.
I. V. Sokolov A. A. Smirnov Yu. G. Antipin K. V. Baranovsky 《Journal of Mining Science》2013,49(1):90-98
Simultaneous extraction of ore reserves from open pitwall and the layer immediately adjacent to the open pit bottom results in higher volume of ore discharge in the limited bottom area, besides the bottom must be stable within the adjacent layer extraction interval. The authors select the pit bottom design with two-way alternate arrangement of loading entries, taking into account the use of power-driven load-haul-dumpers. The ore output with the given pit bottom design is evaluated. 相似文献
10.