Evolution of nuclear structure concepts: from the liquid drop to quark-gluonic interactions in nuclei
Evolution of nuclear structure concepts: from the liquid drop to quark-gluonic interactions in nuclei
B. S. Ishkhanov$^{1,2}$, D. E. Lanskoy$^2$
Evolution of nuclear structure concepts is traced from the simplest drop and single-particle shell models in view of the Thomas Jefferson Lab (USA) experiment, in which short-range correlations of nucleons in nuclei have been studied. It is argued that treatment of the short-range correlations requires theoretical consideration of subnucleonic (quark and gluonic) degrees of freedom in nuclei.
Show AbstractExtreme events on EEG signals of rodents with induced stroke
Extreme events on EEG signals of rodents with induced stroke
V. V. Grubov
In present work we studied extreme events that occur on elecroencephalogram of rodents with induced stroke. These events were registered as epileptic seizures with form of sudden high-amplitude oscillations, that emerge during first 2-3 hours after the stroke. Time-frequency structure analysis of electroencephalogram showed, that extreme events manifest themselves as sharp increase in wavelet energy distribution for characteristic frequency range. At the same time, wavelet energy in the rest part of spectrum remained unchanged. Revealed distinct features of extreme events were used for their detection on electroencephalogram. Quantification of extreme behaviour was held with help of construction of probability distribution functions for wavelet energy maxima and their approximation with different analitical distribution functions.
Show AbstractThe spectrum features of a powerful laser diodes at slow degradation
The spectrum features of a powerful laser diodes at slow degradation
V. V. Bliznyuk$^1$, O. I. Koval$^1$, V. P. Alekseevich$^1$, A. G. Rzhanov$^2$, A. E. Tarasov$^1$
The experimental results of observation of frequency spectra of high-power semiconductor lasers are presented. The reasons for the transformation of laser spectra during long-term time operation are discussed. Estimates of changes in the optical parameters of the laser, which change during its slow degradation and determine the type of its frequency spectrum, are given.
Show AbstractOn the mass transport in the propagation of a wavepacket along the interface of liquid media.
On the mass transport in the propagation of a wavepacket along the interface of liquid media.
A. A. Ochirov
The regularities of a mass-transfer caused by a Stokes’s wave package propagating at a horizontal interface of two environments are investigated analytically asymptotically for a pair of inviscid immiscible fluids which are shifting relate to each other.
Show AbstractSimulation of plasmonic particle excitation by an electron beam (EELS) with the Discrete Sources Method
Simulation of plasmonic particle excitation by an electron beam (EELS) with the Discrete Sources Method
I. V. Lopushenko
A mathematical model of noble metal nanoparticle excitation by point charge in uniform straight motion is considered in homogeneous medium. Nanoparticle size is assumed to be less than $10$nm. The problem solution (EELS spectrum) is constructed with the semi-analytical Discrete Sources Method taking into account the nonlocal effect.
Show AbstractEffect of elastic light scattering on the efficiency of Raman scattering in rutile suspensions in DMSO
Effect of elastic light scattering on the efficiency of Raman scattering in rutile suspensions in DMSO
O. I. Sokolovskaya$^1$, N. B. Tkachenko$^1$, L. A. Golovan$^1$, V. V. Yakovlev$^2$
An experimental study and a numerical simulation of the propagation of laser radiation with wavelengths of 1064 nm and 532 nm in disordered media have been carried out. The samples were suspensions of rutile in DMSO with different volume fraction of scatterers. The effect of the volume fraction of scatterers in the suspension on the photon lifetime in the medium has been investigated. To determine the influence of the volume fraction of scatterers on the Raman efficiency Raman spectroscopy was carried out. It has been shown that at large volume fraction of scatterers decreases the volume of light-matter interaction. The maximum increase in the Raman signal achieved in suspensions is fourfold.
Show AbstractElastography of shear wave: physical modeling on the Verasonics acoustic system and numerical modeling in the toolbox k-Wave
Elastography of shear wave: physical modeling on the Verasonics acoustic system and numerical modeling in the toolbox k-Wave
I. Yu. Demin, A. A. Lisin, A. E. Spivak, D. D. Shneidman
The results of physical and numerical modeling of the propagation of shear waves in soft biological tissues (elastography of shear wave) are presented. Physical modeling was carried out on a Verasonics acoustic system with a phantom imitating a skeletal muscle. Numerical modeling of shear waves is performed in the toolbox k-Wave
Show AbstractCharacteristics of fractal multilayer structures with metamaterials
Characteristics of fractal multilayer structures with metamaterials
Yu. V. Ryzhikova$^1$, Yu. V. Mukhartova$^2$, S. B. Ryzhikov$^3$
The scaling properties of the spectral characteristics of aperiodic multilayer systems with metamaterials are considered. The role of dispersion effects and phase compensation effects is determined by changing the geometry of the layers and the transition to quasicrystalline models of approximants.
Show AbstractWavelet analysis of audiosignals and speech synthesis
Wavelet analysis of audiosignals and speech synthesis
S. A. Nikonorov, A. N. Bogolubov
The speech analysis and approximation algorithm based on the continuous wavelet transform was created. In the current work, audiofiles from the Zuiga Mizuki voice bank were analised and some of them (namely vowel sound files) were synthesised using the suggested algorithm.
Show AbstractThe noise immunity increasing of the communication systems with OFDM-signals using the wavelet transform
The noise immunity increasing of the communication systems with OFDM-signals using the wavelet transform
E. N. Rychkov$^1$, Yu. A. Pirogov$^2$
The communication systems with OFDM-signals have been considered in a comparison with the classic communication systems, which are based on amplitude, frequency and phase modulation types. The possibilily of usage the wavelet transform instead of Fourier transform in such systems has been investigated. The experiment has been done with a matching of received information in two types of OFDM-systems: with Fourier and wavelet transforms. There has been shown that wavelet-basis can lead to the benefit with a selective fadding, so as information in such a signal is not localized in frequency domain, but, on the other hand, is not blurred in the time domain. Thus, the possibility has been demonstrated to build new communication systems, in which the optimal parameters of the system are not distributed in several algorithms, but are concentrated in wavelet transform. Such several algorithms in common OFDM-systems are interleaving coding, OQAM-IOTA, FBMC and others.
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