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191.
Z. A. Rogovin M. O. Lishevskaya R. M. Livshits A. G. Kronman B. I. Fedoseev 《Fibre Chemistry》1971,1(5):513-516
Conclusions 1. The authors have obtained modified viscose fibres containing PVC in amounts reaching 25–230% of the weight of cellulose. The molecular weight of the grafted chain varies between 40,000 and 140,000; the degree of conversion of cellulose does not exceed 13–22%.2. It is shown that grafting of PVC increases the absolute strength and elongation of fibres, reduces the loss of wet strength, and reduces the resistance to repeated bending. A marked reduction of the fibre number reduces their strength.3. The results are explained by the probability that graft copolymerization takes place on a supramolecular level.Moscow Textile Institute. Translated from Khimicheskie Volokna, No. 5, pp. 30–32, September–October, 1969. 相似文献
192.
B.V. Derjaguin V.N. Bakul D.V. Fedoseev Yi.I. Nikitin V.L. Primachuk A.V. Lavrentev V.P. Varnin 《Powder Technology》1974,9(1):15-18
The effect of intermixing on the synthesis of two concurrent phases, i.e. diamond and graphite, is discussed. An experimental unit is described, and experimental results are presented. 相似文献
193.
194.
A. D. Fedoseev 《Glass and Ceramics》1960,14(4):140-142
195.
The Np(IV) complex [Np(DMSO)7(NO3)](ClO4)3 was synthesized and studied by single crystal X-ray structural analysis. The crystal structure contains three crystallographically independent formula units. The complex cations [Np(DMSO)7(NO3)]3+ contain bidentate chelate nitrate ions and DMSO molecules coordinated to the Np atom via O atom. The coordination polyhedra (CPs) of the two crystallographically independent Np atoms can be described as base-monocapped tetragonal antiprisms, whereas the CP of the third crystallographically independent Np atom should be described as a trigonal prism tricapped at lateral faces. In contrast to many other structures of dimethyl sulfoxide complexes of actinide and lanthanide perchlorates, the DMSO molecules and perchlorate ions in the structure under consideration show no disordering. 相似文献
196.
The interaction of An(IV) ions (An = Th, U, Np, Pu) with 2,6-pyridinedicarboxylic acid (2,6-PDCA) in solutions was studied by spectrophotometry. The electronic absorption spectra of the individual complex species An(PDC)2+, An(PDC)2, and An(PDC) 3 2? (PDC2? is 2,6-PDCA anion; An = U, Np, Pu) were obtained. At [2,6-PDCA] ? 3[An(IV)] + 0.01 M and [H+] ? 0.2 M, the prevalent An(IV) species are the complexes An(PDC) 3 2? . Their overall stability constant exceeds 1025 L3 mol?3 and increases in the series from Th(IV) to Pu(IV) by ~8 orders of magnitude. Very high stability of An(IV) complexes with 2,6-PDCA anions leads to significant shifts of the redox potentials of couples involving An(IV). In particular, large difference in the stability of An(III) and An(IV) complexes is responsible for the fact that Pu(III) in the presence of 2,6-PDCA is readily oxidized with atmospheric oxygen to Pu(IV). 相似文献
197.
The formal potential of the Fe(CN) 6 3? /Fe(CN) 6 4? couple in 1 M NaHCO3 and 1–2 M Na2CO3 solutions was determined. It is equal to 505 and 510 mV, respectively, exceeding the potentials of the Np(VI)/(V) and Np(V)/(IV) couples in carbonate solutions. The equilibrium of the reaction Np(V) + Fe(CN) 6 3? = Np(VI) + Fe(CN) 6 4? was studied. Fe(CN) 6 3? ions oxidize Np(IV) to Np(V) and then to Np(VI). The arising Np(VI) oxidizes Np(IV). The Np(IV) oxidation accelerates in going from NaHCO3 to Na2CO3. An increase in [Na2CO3] or in the ionic strength (by adding neutral salts) decelerates the oxidation. Np(IV) introduced in an HCl solution reacts with Fe(CN) 6 3? or with Np(VI) faster than Np(IV) introduced in a Na2CO3 solution. The activation energy of the reaction of Np(IV) with Fe(CN) 6 4? in the range 20–45°C is 107 kJ mol?1. The reaction mechanism involves formation of the activated complex from ions of Np(IV) hydroxocarbonate and oxidant. 相似文献
198.
A. V. Gogolev E. V. Zakharova N. I. Rodygina A. M. Fedoseev V. P. Shilov 《Radiochemistry》2006,48(3):249-253
Reaction of Np(VI) compounds with Fe(II) in bicarbonate solutions was studied. Reaction of Np(V) with Fe(II) in the presence of phthalate ions was briefly considered. Iron(II) compounds reduce Np(V) compounds in solutions saturated with Ar or CO2 at any concentrations of bicarbonate ion. At [Na(K)HCO3] > 0.86 M, Np(V) is reduced during mixing the reactants and recording the spectra. The reaction of Fe(II) with Np(V) in dilute bicarbonate solutions is substantially slower, probably owing to a sharp decrease in the solubility of the Np(V) carbonate complexes. The solubility of the Np(V) compounds increases after saturation of the dilute bicarbonate solutions with CO2. However, in this case reduction remains slow. Uranium(VI) carbonate complexes are reduced with Fe(II) compounds in dilute bicarbonate solutions. The reaction products formed at elevated temperatures are UO2 and FeOOH. 相似文献
199.
A double neptunyl(V) cesium molybdate, Cs[NpO2MoO4(H2O)], was studied by single crystal X-ray diffraction. Crystal data: rhombic system, a = 9.478(2), b = 7.900(1), c = 10.499(2) Å; space group Pnna, Z = 4, d = 5.05 g cm?3, R = 0.030. The compound has a framework structure; the coordination polyhedron of the Np atom is a distorted pentagonal bipyramid with the equatorial positions occupied by four O atoms of four molybdate groups and an O atom of the coordinated water molecule. The IR and visible absorption spectra of this compound and of Cs2[(NpO2)2Mo2O8] whose structure had been determined previously were measured. The NpO 2 + stretching vibration frequencies in the IR spectra of these compounds virtually coincide. Incorporation of the O atom of the Mo-O-Mo bridge into the first coordination sphere of the neptunyl(V) ion in Cs2[(NpO2)2Mo2O8] exerts the same disturbing effect on the electronic absorption spectrum as does the cation-cation interaction with one of the O atoms acting as a bridge between two Np atoms. 相似文献
200.
D. V. Aleshin I. N. Shishov V. I. Fedoseev 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2005,39(1):19-26
The possibility of creation of a frozen-ground curtain in permeable soils with a permeability of 800 – 900 m-day with the help of a liquid system with forced circulation of kerosene is shown.Translated from Gidrotekhnicheskoe Stroitelstvo, No. 12, December 2004, pp. 14 – 22. 相似文献