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1.
V.?A.?MakarovEmail author V.?M.?Petnikova K.?V.?Rudenko V.?V.?Shuvalov 《Physics of Wave Phenomena》2015,23(2):96-100
An analytical solution to the one-dimensional (plane waves) nonintegrable problem of interaction (collision) of a dark soliton with a cnoidal wave (control and information signals with orthogonal circular polarizations) in an isotropic gyrotropic medium with Kerr nonlinearity and second-order groupvelocity dispersion is obtained in the adiabatic approximation. The asymptotic behavior of the obtained solution is considered. It is shown that the role of the control signal is reduced to strong amplitude and frequency modulation, which is localized only in the region of variation in the control signal intensity. 相似文献
2.
We use tools of the equilibrium statistical mechanics of disordered systems to study analytically the statistical properties of an ecosystem composed of N species interacting via random mutual interactions, as well as via deterministic self-interactions of order p>/=2. We show that the main effect of increasing the order of the interactions among the species is to make the system less competitive, in the sense that the fraction of extinct species is greatly reduced. In addition, we find that for p>2 there is a threshold value which gives a lower bound to the concentration of the surviving species, preventing then the existence of rare species and, consequently, increasing the robustness of the ecosystem to external perturbations. 相似文献
3.
V. A. Vysloukh V. Kutuzov V. M. Petnikova V. V. Shuvalov 《Journal of Experimental and Theoretical Physics》1997,84(2):388-394
An analytical model, which describes the drift and diffusion mechanisms for the formation of the nonlinear response (local
and nonlocal nonlinearities) of photorefractive crystals on the microscopic level, is constructed. New types of stable self-consistent
distributions of the light field intensity, i.e., spatial solitons, are found. The trajectories of their motion (self-bending)
are calculated, and the possibility of observing a new nonlinear-optical effect in photorefractive crystals, viz., the formation
of spatial shock waves, is demonstrated. The modulation instability appearing when plane waves propagate in photorefractive
crystals is analyzed, and the characteristic spatial scales of the light field distribution formed as a result of self-interaction
(fanning) are determined. The results of the analysis are confirmed by computer simulation data.
Zh. éksp. Teor. Fiz. 111, 705–716 (February 1997) 相似文献
4.
The possibility of observing large-scale changes in the hydrology of a shallow-water waveguide, based on the data on frequency
shifts of conjugate wave field maximum, is analyzed. The field focusing at the observation point is controlled by changing
the radiation frequency. The error in measuring variations in the mean temperature at different signal-to-noise ratios is
estimated. 相似文献
5.
V. A. Makarov V. M. Petnikova P. S. Ryzhikov V. V. Shuvalov A. V. Yadvichuk 《Physics of Wave Phenomena》2017,25(1):20-23
A particular analytical solution to the nonintegrable problem of plane electromagnetic wave propagation through an isotropic gyrotropic nonlinear medium is found in the form of elliptically polarized breather. The intensity ratio for the circularly polarized components of this wave, which remains constant during propagation, can be used to determine the ratio of local and nonlocal nonlinear susceptibilities describing the Kerr nonlinearity and its spatial dispersion. 相似文献
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7.
Allison M Fox Mike Anderson Corinne Reid Tim Smith Dorothy VM Bishop 《BMC neuroscience》2010,11(1):1-15
Background
We examined development of auditory temporal integration and inhibition by assessing electrophysiological responses to tone pairs separated by interstimulus intervals (ISIs) of 25, 50, 100, 200, 400, and 800 ms in 28 children aged 7 to 9 years, and 15 adults.Results
In adults a distinct neural response was elicited to tones presented at ISIs of 25 ms or longer, whereas in children this was only seen in response to tones presented at ISIs above 100 ms. In adults, late N1 amplitude was larger for the second tone of the tone pair when separated by ISIs as short as 100 ms, consistent with the perceptual integration of successive stimuli within the temporal window of integration. In contrast, children showed enhanced negativity only when tone pairs were separated by ISIs of 200 ms. In children, the amplitude of the P1 component was attenuated at ISIs below 200 ms, consistent with a refractory process.Conclusions
These results indicate that adults integrate sequential auditory information into smaller temporal segments than children. These results suggest that there are marked maturational changes from childhood to adulthood in the perceptual processes underpinning the grouping of incoming auditory sensory information, and that electrophysiological measures provide a sensitive, non-invasive method allowing further examination of these changes. 相似文献8.
V. A. Makarov V. M. Petnikova N. N. Potravkin V. V. Shuvalov 《Physics of Wave Phenomena》2013,21(4):264-269
Particular solutions to the general case of a nonintegrable system of Schrödinger nonlinear equations in the form of a family of cnoidal waves are found on the assumption of linear relationship between the squared moduli of the orthogonal components of a vector field. The domains of existence of solutions and the corresponding spectra of eigenvalues are determined. 相似文献
9.
A. V. Voronov V. M. Petnikova V. V. Shuvalov 《Journal of Experimental and Theoretical Physics》2001,93(5):1091-1100
A phenomenological model describing “magnetodipole” self-organization of charge carriers (the formation of so-called stripe-structures and the energy gap in the spectrum of states) was suggested to interpret the data of nonstationary nonlinear spectroscopy of high-T c superconductors. It was shown that, after rapidly heating a superconducting sample, the kinetics of the succeeding phase transition depended on initial temperature T. At small “overheatings” T*<T<T m x≈(1.4?1.5)T* (T c and T*≈T c are the temperatures of the transition to the superconducting state and the formation of stripe-structures) and the optimal level of doping, the decay of stripe-structures (and of the gap in the spectrum of states) occurred at a low rate (in times above to 10?9 s) in spite of the virtually instantaneous disappearance of superconductivity. 相似文献
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