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81.
V. V. Derevyanko M. S. Sungurov T. V. Sukhareva V. A. Finkel’ Yu. N. Shakhov 《Physics of the Solid State》2018,60(10):1930-1934
The problem of establishing the correlation between, on the one hand, the chemical and phase compositions of Ni1–xWx alloys (0 ≤ x ≤ 0.5) and, on the other hand, the character of the temperature dependences of the electrical resistivity, is considered. Based on the experimental ρ(T) curves, the concentration dependences of are reconstructed in the wide temperature range (50 K ≤ T ≤ 273 K). The ρ(x) curves have features related to a change in the crystal structures of the alloys (concentration fcc–bcc phase transition), their magnetic structures and percolation processes occurring in the two-phase fcc + bcc medium. 相似文献
82.
A. A. Chlenova A. A. Moiseev M. S. Derevyanko A. V. Semirov V. N. Lepalovskij G. V. Kurlyandskaya 《Technical Physics》2018,63(1):67-72
Multilayer structures based on Fe19Ni81 films have been obtained by ion-plasma sputtering and investigated on an impedance spectroscopy apparatus equipped with a temperature unit. An increase in the magnetoimpedance ratios for the total impedance and its real part has been found for the multilayer structure (Cu/FeNi)5/Cu/(Cu/FeNi)5 upon heating from 25 to 50°C. The maximum of the giant magnetoimpedance ratio of the total impedance ΔZ/Z = 56% has been observed at a frequency of 80 MHz with a sensitivity of 18%/Oe, while the maximum of the real part ΔR/R = 170% was observed at the frequency of 10 MHz with the sensitivity of 46%/Oe. Magnetization and resistivity at the direct current have been found to depend insignificantly on the temperature and, hence, the relaxation mechanism due to the magnetoelastic anisotropy was proposed as the most probable mechanism of increasing the value and sensitivity of the magnetoimpedance effect. 相似文献
83.
84.
A. A. Ishchenko I. L. Mushkalo N. A. Derevyanko U. Zakhidov T. Sh. Khidirova N. Nizamov 《Journal of Applied Spectroscopy》1989,50(2):169-174
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 50, No. 2, pp. 237–243, February, 1989. 相似文献
85.
V. V. Shelkovnikov D. I. Derevyanko L. V. Ektova N. A. Orlova V. A. Loskutov E. V. Vasil’iev E. V. Karpova 《Polymer Science Series B》2016,58(5):519-528
The kinetics of thiol–enol photopolymerization of a hybrid composition based on a tetraacrylate monomer and a thiol-siloxane oligomer was studied with the use of a holographic recording of elementary transmission phase gratings. The degrees of conversion of double bonds in the tetraacrylate monomer after the polymerization in air and in an inert atmosphere of SF6 were measured via IR spectroscopy. It is shown that the use of the thiol-siloxane oligomer efficiently suppresses oxygen inhibition of the photopolymerization. When the photoinitiator concentration is increased to more than 10–2 mol/L, the photopolymerization rate levels off. An increase in the thiol-siloxane oligomer concentration leads to an extremal dependence of the photopolymerization rate on the oligomer concentration; the maximum rate is reached at an oligomer concentration of about 0.07 mol/L. The kinetic scheme of photopolymerization in the hybrid photopolymer composition was analyzed, and an analytical expression for the photopolymerization rate was obtained. The correlation between the kinetic constants of the thiol–enol photopolymerization was evaluated on the basis of the obtained parameters of the kinetic model. 相似文献
86.
On the mechanism of extraction of trivalent actinides and lanthanides with alkylamine hydrochlorides
E. P. Derevyanko E. G. Chudinov 《Journal of Radioanalytical and Nuclear Chemistry》1977,36(2):451-455
The method to study the mechanism of actinides (III) and lanthanides (III) liquid-liquid amine extraction from chloride media
has been suggested. The technique is based on the determination of distribution coefficients for extraction of these elements
from mixed salting-out agent solutions with common anion. Distribution coefficients were found to be independent of mean ion
activity of lithium cation at constant water activity, when extraction of trace amounts of Eu (III) and Cm(III) by tri-n-octylammonium
hydrochloride from mixed LiCl−CaCl2 solutions occurred. It has been concluded that lithium cation does not enter into the complexed extracted. 相似文献
87.
N. A. Davidenko N. A. Derevyanko A. A. Ishchenko S. L. Studzinskii 《Theoretical and Experimental Chemistry》2008,44(6):351-355
We have observed that in an external d.c. electric field, in the differential fluorescence spectra of both symmetric and asymmetric
polymethine dyes in a polymer film, the intensity of the emission in the long-wavelength region of the band increases while
the intensity in the short-wavelength region decreases. In symmetric polymethines, these effects are opposite to those in
the differential absorption spectra, while in asymmetric polymethines they are symbatic. The spectral effects were interpreted
by a change in the probability of the vibronic transitions due to redistribution of electron density in the chromophore, in
the ground state and the excited state of the dye, in an external electric field.
Translated from Teoreticheskaya i éksperimental'naya Khimiya, Vol. 44, No. 6, pp. 343–347, November–December, 2008. 相似文献
88.
89.
N. A. Davidenko N. A. Derevyanko A. A. Ishchenko V. A. Pavlov 《Physics of the Solid State》2001,43(8):1426-1432
The effect of a dc electric field on the evolution of the electronic absorption spectra of poly(N-epoxypropylcarbazole) (PEPC), poly(styrene) (PS), and poly(vinyl butyral) (PVB) films doped with methine dyes is investigated. It is revealed that these spectra in the absorption range of the dye undergo transformations depending on the dipole moment and the symmetry of the π-electron structure of dye molecules. The inference is made that the electron density in the dye molecule is redistributed in an external electric field. This redistribution gives rise to the electric field-induced anisotropy in the spatial distribution function of photogenerated electron-hole pairs in amorphous molecular semiconductors. 相似文献
90.
It has been shown that specific electrostatic interactions between charges of ion dyes and functional groups of polymer play main role in the cause of polar coulored matrices. These interaction prevent by formation tight ion pairs of dyes and their associates. Therefore, such matrices have practically the same electronic spectra as liquid solution of dyes. Electrostatic interactions between dye counterions dominate in low polarity polymer matrices. Process of formation tight ions pair is became easier. Such pairs cause quenching of the fluorescence and distortion of electronic spectra by comparison with liquids. 相似文献