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91.
92.
Victoria E. Gontcharenko Mikhail A. Kiskin Vladimir D. Dolzhenko Vladislav M. Korshunov Ilya V. Taydakov Yury A. Belousov 《Molecules (Basel, Switzerland)》2021,26(9)
Three novel lanthanide complexes with the ligand 4,4-difluoro-1-(1,5-dimethyl-1H-pyrazol-4-yl)butane-1,3-dione (HL), namely [LnL3(H2O)2], Ln = Eu, Gd and Tb, were synthesized, and, according to single-crystal X-ray diffraction, are isostructural. The photoluminescent properties of these compounds, as well as of three series of mixed metal complexes [EuxTb1-xL3(H2O)2] (EuxTb1-xL3), [EuxGd1-xL3(H2O)2] (EuxGd1-xL3), and [GdxTb1-xL3(H2O)2] (GdxTb1-xL3), were studied. The EuxTb1-xL3 complexes exhibit the simultaneous emission of both Eu3+ and Tb3+ ions, and the luminescence color rapidly changes from green to red upon introducing even a small fraction of Eu3+. A detailed analysis of the luminescence decay made it possible to determine the observed radiative lifetimes of Tb3+ and Eu3+ and estimate the rate of excitation energy transfer between these ions. For this task, a simple approximation function was proposed. The values of the energy transfer rates determined independently from the luminescence decays of terbium(III) and europium(III) ions show a good correlation. 相似文献
93.
Yu. B. Kudasov O. M. Surdin A. S. Korshunov V. N. Pavlov N. V. Frolova R. S. Kuzin 《Journal of Experimental and Theoretical Physics》2013,117(4):664-671
The dispersion of phonons in the fcc, hcp, and bcc phases of aluminum is calculated at ultrahigh pressures by the method of small displacements in a supercell. The stability of the phonon subsystem is studied. The thermodynamic characteristics are calculated in the quasi-harmonic approximation, and a phase diagram of aluminum is plotted. As compared to the Debye model, the use of a phonon spectrum calculated in the quasi-harmonic approximation significantly broadens the hcp phase field and strongly shifts the phase boundary between the fcc and bcc phases. The normal isentrope is calculated at megabar pressures. It is shown to intersect the fcc-hcp and hcp-bcc phase boundaries. The sound velocity along the normal isentrope is calculated. It is shown to have a nonmonotonic character. 相似文献
94.
V. I. Wachtel D. E. Denisov D. A. Korshunov 《Proceedings of the Steklov Institute of Mathematics》2013,282(1):273-297
As is well known, for a supercritical Galton-Watson process Z n whose offspring distribution has mean m > 1, the ratio W n := Z n /m n has almost surely a limit, say W. We study the tail behaviour of the distributions of W n and W in the case where Z 1 has a heavy-tailed distribution, that is, $\mathbb{E}e^{\lambda {\rm Z}_1 } = \infty $ for every λ > 0. We show how different types of distributions of Z 1 lead to different asymptotic behaviour of the tail of W n and W. We describe the most likely way in which large values of the process occur. 相似文献
95.
A. I. Uraev O. Yu. Korshunov A. L. Nivorozhkin A. S. Antsyshkina G. G. Sadikov V. I. Nevodchikov V. S. Sergienko A. D. Garnovskii 《Russian Journal of Inorganic Chemistry》2009,54(4):521-529
The reactions of 1,3-alkyl(aryl) derivatives of 5-amino-4-azopyrazoles (HL) with copper(2+) acetate afford metal chelates CuL2. Complexes with the CuN4 chromophore containing a substituted amino group (X = NR) as a donor, like their azomethine analogues, have a pseudotetrahedral structure. Copper chelates with X = NH are planar. The X-ray diffraction data and an additional hyperfine structure (ahfs) from 15N atoms of the azo group in the labeled complexes provide evidence for the formation of six-membered metallocycles. The coordination polyhedron in bis{1-phenyl-3-methyl-4-(p-tolyl)azo-5-(p-carboxymethoxyphenyl)pyrazolamidato}Cu(II) can be described as a pseudotetrahedron. 相似文献
96.
M. A. Korshunov 《Journal of Applied Spectroscopy》2010,77(2):261-265
We have obtained experimental low-frequency Raman spectra for light scattering by nanoparticles of para-dichlorobenzene of size ∼300–70 nm. As their sizes decrease, the line frequencies decrease. The size of the nanoparticles
was determined using an electron microscope. We found that in the lattice vibrational spectrum of nanoparticles of size 300–70
nm, a summed spectrum appears from α-para-dichlorobenzene and β-para-ichlorobenzene. This is consistent with molecular dynamics calculations of the structure of the nanoparticle and calculations
of the histograms for the lattice vibrational spectra by the Dean method. 相似文献
97.
Yu. B. Kudasov A. S. Korshunov V. N. Pavlov D. A. Maslov 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(1):6-8
Generalizations of Glauber dynamics on the triangular lattice of Ising chains are considered. Magnetic moment relaxation and
the response to an AC magnetic field in Ca3Co2O6 are investigated. It is shown that all of the main features of the dynamics of a frustrated lattice of spin chains can be
described qualitatively in the framework of an extended two-dimensional model. 相似文献
98.
Dotsenko VS Ioffe LB Geshkenbein VB Korshunov SE Blatter G 《Physical review letters》2008,100(5):050601
We consider two configurations of a random directed polymer of length L confined to a plane and ending in two points separated by 2u. Defining the mean free-energy F[over ] and the free-energy difference F;{'} of the two configurations, we determine the joint distribution function P(L,u)(F[over ],F(')) using the replica approach. We find that for large L and large negative free energies F[over ], the joint distribution function factorizes into longitudinal [P(L,u)(F[over ])] and transverse [P(u)(F('))] components, which furthermore coincide with results obtained previously via different independent routes. 相似文献
99.
Elena Ya. Zabotina Igor A. Litvinov Lyudmila G. Kuz'mina Ruslan L. Korshunov 《Heteroatom Chemistry》1996,7(2):123-130
2-Phenyl-5-methyl- and 2,5-diphenyl-2H-1,2,3-diazaarsoles 1a,b react with phenyl azide to give several crystalline products: tricyclic derivatives 2a,b and 4,4′-bis(2H-1,2,3-diazaarsoles) 5a,b formed at room temperature, and a cycloadduct 6a obtained at +4°C. Compound 6a undergoes a fast rearrangement in solutions of Et3N or pyridine to give a stable dicoordinate arsenic compound, the 2H-1,2,3-diazaarsole 7a. Heating solutions of 2a under reflux in an inert atmosphere leads to 5a and of 2b, in the presence of water, to 4b. The structures of 2a, 4b, and 7a were characterized by X-ray crystal structure determinations. © 1996 John Wiley & Sons, Inc. 相似文献
100.
Borovitskaya I. V. Korshunov S. N. Mansurova A. N. Bondarenko G. G. Lyublinsky I. E. 《Physics of Atomic Nuclei》2023,85(1):S71-S79
Physics of Atomic Nuclei - A review of studies on the effect of intense flows of argon ions and high-power pulsed laser radiation on properties such as microhardness, radiation erosion, structural... 相似文献