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Davydov V.V.,The Bonch-Bruevich St. Petersburg State University of Telecommunications | Myazin N.S.,Polytechnic University of Mozambique | Velichko E.N.,Polytechnic University of Mozambique
Technical Physics Letters | Year: 2017

The characteristics of signal registration of nuclear-magnetic resonance in a weak magnetic field from a small volume of an investigated medium have been considered. The consideration of the characteristics revealed in a new developed design of a magnetic system for a compact nuclear-magnetic spectrometer, and also in the NMR-signal registration method allows significant extension of the possibility to use the phenomenon of nuclear-magnetic resonance for the study of condensed medium in an express mode. The experimental results of different media studies have been presented. © 2017, Pleiades Publishing, Ltd.


Davydov V.V.,The Bonch-Bruevich St. Petersburg State University of Telecommunications | Myazin N.S.,Polytechnic University of Mozambique
Measurement Techniques | Year: 2017

A compact nuclear-magnetic spectrometer is examined in which the design takes account of the special features of registration in the weak magnetic field of the NMR signal of a compact condensed medium. A table of characteristics of the nuclei most often used in nuclear-magnetic spectroscopy is compiled. The results of experimental studies of the condensed media are presented. © 2017 Springer Science+Business Media, LLC


Novikov D.V.,The Bonch-Bruevich St. Petersburg State University of Telecommunications | Krasovskii A.N.,Saint Petersburg State University
Physics of the Solid State | Year: 2012

The spatial correlations on the surface of films obtained from aqueous solutions of gelatin during cooling from 320 to 293 K have been studied using electron microscopy. It has been shown that the total density fluctuation correlation function on the scale R > 4 nm can be represented in the form h(R) ~ R -nexp(-R/ζ), where the correlation radius ζ coincides with the hydrodynamic radius of a macromolecule. Unfolding of macromolecules in the coil → helix transformation leads to a decrease in the density and the fractal dimension of the physical network of pinnings of macromolecules and to variation in the index n of the power term in the function h(R) from n = 1 to 2, due to the transition from a continual type of disorder to a cellular type in a solid. © 2012 Pleiades Publishing, Ltd.


Novikov D.V.,The Bonch-Bruevich St. Petersburg State University of Telecommunications | Krasovskii A.N.,Saint Petersburg State University | Mnatsakanov S.S.,Saint Petersburg State University
Physics of the Solid State | Year: 2012

The topology of the surface of thin films obtained from cellulose triacetate solutions has been studied using electron microscopy. The domain structure of the physical network of macromolecules (percolation cluster) with the maximum size L ≈ 30 nm of regions with a local orientational order has been established. With an increase in the volume fraction Ω of the cluster to the critical value Ω = 0. 91, repacking of domains takes place, which is connected with a decrease in the parameter Ω, L doubling bifurcation of the size L, and formation of regions of long-range orientational order: the mesophase of the polymer. © 2012 Pleiades Publishing, Ltd.


Kabardov M.M.,The Bonch-Bruevich St. Petersburg State University of Telecommunications | Sharkova N.M.,Saint Petersburg State University
Proceedings of the International Conference Days on Diffraction 2015, DD 2015 | Year: 2015

The study and design of electronic components, based on ballistic electron transport in nanowires, recently show steep increase of interest. The components can be field effect transistors, resonant tunneling, diodes, lasers, cubits, etc. Previously we carried out numerical simulations of electron transport for energies far from the thresholds (in the case of multichannel scattering). Here we present the results of numerical simulations of electron transport in nanowires near a threshold and compare the conventional and augmented scattering matrices elements. © 2015 IEEE.


Sivers M.,Saint Petersburg State Polytechnic University | Fokin G.,The Bonch-Bruevich St. Petersburg State University of Telecommunications
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

In this paper we investigate the positioning accuracy of user equipment (UE) with observed time difference of arrival (OTDoA) technique in Long Term Evolution (LTE) networks using dedicated positioning reference signal (PRS) by means of comprehensive simulation model. System-level model includes typical cellular network layout with spatially distributed eNodeB (eNB) and link-level model simulates PRS transmission and reception with LTE System Toolbox. Matlab “TDOA Positioning Using PRS example” was developed to include known linear least squares (LLS), nonlinear Gauss-Newton (GN) and Levenberg-Marquardt (LM) positioning algorithms and compare it with Cramer-Rao lower bound (CRLB). Resulting estimates clarify known results and reveal that simple LLS achieves close to LM positioning accuracy when the number of eNB is 6, while further increasing the number of eNB degrades positioning algorithms accuracy. © Springer International Publishing Switzerland 2015.


Niembro R.,University of Cantabria | Marcos S.,University of Cantabria | Lopez-Quelle M.,University of Cantabria | Savushkin L.N.,The Bonch-Bruevich St. Petersburg State University of Telecommunications
Physics of Atomic Nuclei | Year: 2012

Relativistic nonlinear models based on the Hartree and Hartree-Fock approximations, including the σ, ω, π, and ρ mesons, are worked out to explore the behavior of the nuclear charge radii and the binding energies of several isotopic chains. We find a correlation between the magnitude of the anomalous kink effect (KE) in the Pb isotopic family and the compressibility modulus (K) of nuclear matter. The KE appears to be sensitive, in particular, to the mechanisms which control the K value. The influence of the symmetry energy on the Ca isotopic chain is also studied. The behavior of the charge radii of single-particle states for some special cases and its repercussion on the nuclear charge radius is analyzed. The effect of pairing correlations on the models improves considerably the quality of the results in both binding energy and KE. © 2012 Pleiades Publishing, Ltd.


Marcos S.,University of Cantabria | Lopez-Quelle M.,University of Cantabria | Niembro R.,University of Cantabria | Savushkin L.N.,The Bonch-Bruevich St. Petersburg State University of Telecommunications
Physics of Atomic Nuclei | Year: 2014

The binding energies of several isotopic families are studied within the relativistic Hartree-Fock approximation with the pseudovector coupling for the πN vertex, to find out a suitable strength for the effective pion tensor force (EPTF). An approximation for determining separately the contributions of the central and tensor forces generated by pion is considered. The results for heavy nuclei indicate that a realistic strength for the EPTF is smaller than a half of that appearing in the OPEP. This conclusion also applies to the results for the single-particle energies. Besides, it has been found that there is a genuine relativistic contribution of the EPTF in nuclear matter which is small but significant. © 2014 Pleiades Publishing, Ltd.


Borzov V.V.,The Bonch-Bruevich St. Petersburg State University of Telecommunications | Damaskinsky E.V.,Institute of Defense Technical Engineering VITI
Proceedings of the International Conference Days on Diffraction 2011, DD 2011 | Year: 2011

We obtain differential equations for polynomials related to a periodic Jacobi matrix, using the known representation for such polynomials by classical Chebyshev polynomials. As an example we discuss the elementary N-symmetrical Chebyshev polynomials, which arose in studying of the compound model for generalized oscillator. © 2011 IEEE.


Borzov V.V.,The Bonch-Bruevich St. Petersburg State University of Telecommunications | Damaskinsky E.V.,VI IT Affilated to VA Mto
Proceedings of the International Conference Days on Diffraction 2014, DD 2014 | Year: 2015

In a recent article (Honnouvo, Thirulogasanthar, arXiv:1305.2509) the authors discussed the question: under which conditions the oscillator algebra connected with orthogonal polynomials on real line is finite-dimensional. In the article, only the case when polynomials are orthogonal with respect to a symmetric measure on the real axis was considered. Here we point some omission and extend the results of the work to the case when measure is not symmetric. In conclusion we give some remarks about the oscillator algebras associated with two-dimensional polynomials. © 2014 IEEE.

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