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31.
V. G. Alpatov Yu. D. Bayukov A. V. Davydov Yu. N. Isaev G. R. Kartashov M. M. Korotkov V. V. Migachev I. N. Rozantsev M. G. Shchepkin 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(6):769-772
Experiments on the search for the effect of resonant screening on the Mössbauer absorption of 119m Sn γ rays of energy 23.8 keV emitted by a standard Mössbauer Ca119m SnO3 γ source in the resonant SnO2 absorber of natural isotopic composition are described. Intensities of tin γ rays and X-rays that passed through the absorber were measured with and without a resonant cylindrical screen (which was a black absorber for the 23.8-keV Mössbauer γ line) around the absorber and their ratios were calculated for each radiation separately. No difference beyond the experimental error was found between these ratios measured with the γ source both at rest and when oscillating with a frequency and amplitude enough to completely break the conditions for Mössbauer resonant absorption of 23.8-keV γ rays. The upper limit for the relative decrease, due to the influence of the resonant screen, in the intensities of these γ rays after their passing through the resonant absorber was 0.00030. 相似文献
32.
We introduce multipole soliton complexes in optical lattices induced by nondiffracting parabolic beams. Despite the symmetry breaking dictated by the curvature of the lattice channels, we find that complex, asymmetric higher-order states can be stable. The unique topology of parabolic lattices affords new types of soliton motion: single solitons launched into the lattice with nonzero transverse momentum perform periodic oscillations along parabolic paths. 相似文献
33.
We address vortex solitons supported by optical lattices featuring modulation of both the linear and nonlinear refractive indices. We find that when the modulation is out of phase the competition between both effects results in remarkable shape transformations of the solitons that profoundly affect their properties and stability. Nonlinear refractive index modulation is found to impose restrictions on the maximal power of off-site solitons, which are shown to be stable only below a maximum nonlinearity modulation depth. 相似文献
34.
Kalinina A. A. Makedoshin A. S. Radostin S. Yu. Gursky N. V. Sokolova T. N. Kartashov V. R. 《Moscow University Chemistry Bulletin》2019,74(1):20-24
It is demonstrated that the reduction of iodonitrotetrazolum chloride in the presence of a Bacillus subtilis suspension in a physiological solution can be described using chemical kinetics equations. The effective kinetic parameters are determined and the role of the diffusion of iodonitrotetrazolium chloride in the process of its reduction involving bacterial cell components is described.
相似文献35.
Mokhov A. V. Kartashov P. M. Gornostaeva T. A. Rybchuk A. P. Bogatikov O. A. 《Crystallography Reports》2021,66(4):648-655
Crystallography Reports - The results of long-term mineralogical studies of the lunar regolith, obtained using analytical scanning and transmission electron microscopy, are presented. These studies... 相似文献
36.
A. V. Arkhipova K. V. Malkova T. N. Sokolova V. R. Kartashov 《Russian Journal of Applied Chemistry》2007,80(1):162-163
The reaction of benzyl thiocyanate with camphene in the presence of heteropoly acids, 12-phosphotungstic and 12-silicotungstic, at 65 C was studied. S-Benzyl (1,7,7-trimethylnorbornyl)thiocarbamate was prepared in 66% yield. 相似文献
37.
Y. V. Kartashov V. A. Vysloukh L. Torner 《The European physical journal. Special topics》2009,173(1):87-105
We present an overview of our recent results in the area of soliton excitation and control in optical lattices induced by
different types of nondiffracting beams featuring unique symmetries. Optical lattices offer the possibility to engineer and
to control the diffraction of light beams in media with transversally modulated optical properties, to manage the corresponding
reflection and transmission bands, and to form specially designed defects. Consequently, they afford the existence of a rich
variety of new families of nonlinear stationary waves and solitons, lead to new rich dynamical phenomena, and offer novel
conceptual opportunities for all-optical shaping, switching and routing of optical signals encoded in soliton formats. In
this overview, we consider different types of solitons, including fundamental, multipole, and vortex solitons in reconfigurable
lattices optically induced by nondiffracting radially symmetric and azimuthally modulated single Bessel beams, soliton control
in networks, couplers, and switches induced by several mutually coherent or incoherent Bessel beams, we address soliton properties
in three-dimensional Bessel lattices, as well as in lattices produced by Mathieu and parabolic optical beams. 相似文献
38.
Yu. D. Bayukov A. V. Davydov G. R. Kartashov M. M. Korotkov 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(6):731-732
Nine sets of measurements aimed at searching for the influence of resonant environment on the half-life of the 109m Sn isomer have been performed during 14.7 months. The intensities of γ and X rays, emitted by two 261Mössbauer sources of identical design and size, were compared in these experiments. One of the sources was kept in the resonant environment of tin dioxide between measurements. No difference was found in the half-lives of 119m Sn that would be beyond the experimental errors (0.35%). 相似文献
39.
Yu. D. Bayukov A. V. Davydov Yu. N. Isaev G. R. Kartashov M. M. Korotkov V. V. Migachev 《JETP Letters》2009,90(7):499-503
Experiments confirming the previous data on the small real width of the γ resonance of 109m Ag have been performed with a gravitational gamma-ray spectrometer. The achieved resolution is eight orders of magnitude higher than that of Mössbauer spectrometers using gamma rays from a 57Fe nuclide. The theoretically predicted broadening of the Mössbauer gamma line of 109m Ag by five orders of magnitude (due to the dipole-dipole interaction between the magnetic moments of neighboring nuclei) has not been observed. 相似文献
40.
We address the impact of the asymmetric nonlocal diffusion nonlinearity of gap solitons supported by photorefractive crystals with an imprinted optical lattice. We reveal how the asymmetric nonlocal response alters the domains of existence and the stability of solitons originating from different gaps. We find that in such media gap solitons cease to exist above a threshold of the nonlocality degree. We discuss how the interplay between nonlocality and lattice strength modifies the gap soliton mobility. 相似文献