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Maps are studied, i.e., cell decompositions of closed two-dimensional surfaces, or two-dimensional atoms which encode bifurcations of Liouville fibrations of non-degenerate integrable Hamiltonian systems. Any finite group G is proved to be a symmetry group of an orientable map (of an atom). Moreover, one such map X(G) is constructed algorithmically. Upper bounds are obtained for the minimal genus Mg(G) of an orientable map with the given symmetry group G and for the minimal number of vertices, edges, and sides of such maps. 相似文献
66.
We give a monoid presentation in terms of generators and define relations for the partial analogue of the finite dual symmetric inverse monoid. 相似文献
67.
L. P. Babich A. Yu. Kudryavtsev M. L. Kudryavtseva I. M. Kutsyk 《Journal of Experimental and Theoretical Physics》2008,106(1):65-76
Gamma-ray pulses are calculated from 2D numerical simulations of an upward atmospheric discharge in a self-consistent electric
field using the multigroup approach to the kinetics of relativistic runaway electrons (REs). Computed γ-ray numbers and spectra
are consistent with those of terrestrial γ-ray flashes (TGFs) observed aboard spacecrafts. The RE flux is concentrated mainly
within the domain of the Blue Jet fluorescence. This confirms that exactly the domain adjacent to a thundercloud is the source
of the observed γ-ray flashes. The yield of photonuclear neutrons is calculated. One γ-ray pulse generates ∼1014–1015 neutrons. The possibility of the direct deposition of REs to the detector readings and the origin of the lightning-advanced
TGFs are discussed.
The text was submitted by the authors in English. 相似文献
68.
N. V. Tcherniega A. D. Kudryavtseva M. I. Samoylovich 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2008,2(4):624-630
The results of study of the photonic flame effect observed in photonic crystals and nanocomposites based on opal matrixes are presented. The effect has been discovered recently [1] and manifests itself as radiation with duration of a few seconds in the blue-green spectral region under excitation by pulsed laser light with a wavelength of 694.3 nm and a pulse duration of 20 ns. 相似文献
69.
Bolbasov E. N. Maryin P. V. Stankevich K. S. Goreninskii S. I. Kudryavtseva V. L. Mishanin A. I. Golovkin A. S. Malashicheva A. B. Zhukov Y. M. Anissimov Y. G. Tverdokhlebov S. I. 《Plasma Chemistry and Plasma Processing》2019,39(2):503-517
Plasma Chemistry and Plasma Processing - Nitrogen-doped thin titanium dioxide films formed by the reactive magnetron sputtering method on the surface of PLLA electrospun microfibers scaffold were... 相似文献
70.
Kudryavtseva T. N. Bogatyrev K. V. Sysoev P. I. Klimova L. G. 《Russian Journal of General Chemistry》2019,89(1):157-159
Russian Journal of General Chemistry - A method for the synthesis of N9-substituted acridine-9-amines by reacting 9-chloroacridines with 2-(2-methyl-5- nitro-1H-imidazol-1-yl)ethanamine was... 相似文献