2304-9782, 2618-8686, 2405-7223
St. Petersburg Polytechnic University Journal. Physics and Mathematics
15
4
2022
1-172
RAR
RUS
7-31
Shadrin
Evgeniy
shadr.solid@mail.ioffe.ru
Ilinskiy
Alexander
ilinskiy@mail.ioffe.ru
Castro Arata
Rene
Herzen State Pedagogical University of Russia
recastro@mail.ru
E-4237-2014
12784708700
0000-0001-9050-4453
Kapralova
Victoria
Peter the Great St. Petersburg Polytechnic University
kapralova2006@yandex.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
Kononov
Aleksey
Herzen State Pedagogical University of Russia
kononov_aa@icloud.com
Pashkevich
Marina
Peter the Great St. Petersburg Polytechnic University
marpash@yandex.ru
The dielectric response modification of nanocrystalline vanadium dioxide films by doping with nickel and tungsten
The process and salient features of modifying the structure of dielectric nanocrystalline vanadium dioxide films by doping with Ni and W transition metals have been studied. The dielectric spectra obtained experimentally were interpreted in terms of Debye relaxation theory and the equivalent circuits method. The changes in the spectra of doped compounds were established to be due to the selective effect of the dopants on various morphological structures of the film surfaces. It was shown that dielectric spectroscopy made it possible to obtain detailed information about parameters of relaxation response of different-sized morphological structures of films, and such information could not be extracted by other research methods.
10.18721/JPM.15401
537.876.4
dielectric spectroscopy
vanadium dioxide films
VO2
insulator-metal phase transition
correlation effects
https://physmath.spbstu.ru/article/2022.61.1/
01_7-31_15(4)2022.pdf
RAR
RUS
32-43
J-6066-2013
35403302800
0000-0003-3947-4994
Firsov
Dmitry
Peter the Great St. Petersburg Polytechnic University
firsov.da@spbstu.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
Shalygin
Vadim
Peter the Great St. Petersburg Polytechnic University
shalygin@rphf.spbstu.ru
Adamov
Roman
Peter the Great St. Petersburg Polytechnic University
roma.adamow@gmail.com
Petruk
Anton
Peter the Great St. Petersburg Polytechnic University
wotgustik@yandex.ru
Melentyev
Grigori
Peter the Great St. Petersburg Polytechnic University
gamelen@spbstu.ru
Sedova
Irina
Ioffe Institute of RAS
irina@beam.ioffe.ru
Sorokin
Sergey
sorokin@beam.ioffe.ru
Makhov
Ivan
National Research University ‘Higher School of Economics”
imahov@hse.ru
Near-infrared photoluminescence in n-GaAs/AlGaAs quantum wells with different locations of compensating acceptor impurity
In the paper, comparative studies of near-IR photoluminescence (PL) in structures with GaAs/AlGaAs quantum wells possessing different selective doping profiles have been performed. The PL spectra recorded at 5 K for different intensities of interband optical pumping were analyzed and main channels of radiative recombination were determined. The dependences of the main PL line intensities on the pump level were obtained. The results of the studies performed suggest that n-GaAs/AlGaAs nanostructures with the compensating acceptor impurity located not in the n-GaAs quantum well, but in its barriers, are preferable for terahertz radiation generation.
10.18721/JPM.15402
535.37
quantum well
GaAs
AlGaAs
photoluminescence
optical pumping
IR radiation
terahertz radiation
https://physmath.spbstu.ru/article/2022.61.2/
02_32-43_15(4)2022.pdf
RAR
RUS
44-54
Timshina
Mariia
Ioffe Institute of RAS
mariyatimshina@yandex.ru
Kalinin
Nikolay
Peter the Great St. Petersburg Polytechnic University
nvkalinin@rambler.ru
The multicharged ion plasma under external laser pulse: calculation of its key parameters
The paper presents a numerical study of laser radiation interaction with cylindrical plasma medium. The model has been described in detail. Non-equilibrium sodium ions were chosen as the active medium and a CO2-laser as an external irradiator. The calculations used the one-dimensional two-temperature single-fluid radiative-hydrodynamic approximation taking into account the non-equilibrium ionic composition and the radiation absorption by plasma due to the inverse bremsstrahlung effect. In the calculations, the used laser pulse characteristics belonged to the range well-studied experimentally; e.g. the intensity of the incident laser radiation was about 100 TW/cm^2. The performed calculations were aimed at the development of research on the creation of active laser media based on the multicharged ions’ transitions working in the extreme UV and soft X-ray bands.
10.18721/JPM.15403
533.9
highly ionized plasma
radiation-hydrodynamic model
laser-plasma interaction
https://physmath.spbstu.ru/article/2022.61.3/
03_44-54_15(4)2022.pdf
RAR
RUS
55-68
Baranov
Maksim
Peter the Great St. Petersburg Polytechnic University
baranovma1993@gmail.com
Karseeva
Elina
Peter the Great St. Petersburg Polytechnic University
elina.nep@gmail.com
Tsybin
Oleg
Peter the Great St. Petersburg Polytechnic University
otsybin@rphf.spbstu.ru
Fourier spectrum of the integral dipole moment of a number of amino acids supercomputer models
In order to analyze molecular vibrations, a method based on the calculation of the Fourier frequency spectrum of supercomputer amplitude-time realizations of the integral dipole moment in supercomputer simulation of glycine, Diphenyl-L-alanine, and tryptophan has been implemented. Under conditions of a zero external electromagnetic field, the frequency spectra of natural local vibrations of the atomic subsystem of the molecule were established to be the results of spectral analysis of these realizations. The spectra were verified by comparison with the known literature data on quantum chemical computing, computer simulation and experimental spectroscopy. It was shown that the proposed complex and technique made it possible to efficiently calculate reliable spectra of local amino acid vibrations. The results obtained may be useful for the development of prototypes of hybrid semiconductor microelectronic devices with built-in biomolecular components.
10.18721/JPM.15404
53.093, 53.096, 57.031, 57.033, 57.038
amino acid
hybrid biomolecular electronics
computer modeling
molecular oscillation
https://physmath.spbstu.ru/article/2022.61.4/
04_55-68_15(4)2022.pdf
RAR
RUS
69-80
0000-0003-4292-0959
Golovitski
Alexander
Peter the Great St. Petersburg Polytechnic University
alexandergolovitski@yahoo.com
Klyuchkovskaya
Julia
klyuchkovskaya2596@gmail.com
The estimation of hard-to-measure physical parameters of thermal dissociation of biomolecules from results of indirect measurements
The present paper is devoted to finding the necessary minimum of experimental information on biomolecules for quantitative evaluation of such physical parameters which cannot be directly measured for some reason, but are connected by known mathematical relations to any measureable quantities. For the case when thermal dissociation of a complex molecule is possible through several channels due to breaking of various intramolecular bonds, an original analytic expression relating the association degree of biomolecules to its physical parameters and the environment temperature has been deduced. It was exemplified the possibility to evaluate (with satisfactory accuracy) some physical parameters of thermal dissociation protease SARS-CoV-2 dimer and the temperature dependence of the association degree of this dimer as well.
10.18721/JPM.15405
577.32
thermal dissociation
biomolecule
association degree
hard-to-measure parameter
protease SARS-CoV-2 dimer
https://physmath.spbstu.ru/article/2022.61.5/
05_69-80_15(4)2022.pdf
RAR
RUS
81-94
Gataulin
Yakov
Peter the Great St. Petersburg Polytechnic University
yakov_gataulin@mail.ru
E-5484-2014
56020596900
Smirnov
Evgeny
Peter the Great St. Petersburg Polytechnic University
aero@phmf.spbstu.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
Molochnikov
Valery
Kazan National Research Technical University named after A. N. Tupolev – KAI
vmolochnikov@mail.ru
Mikheev
Andrei
Federal Research Center ‘Kazan Scientific Center of the Russian Academy of Sciences
AndreiRonnieMiheev@yandex.ru
The structure of a 3D flow with local turbulence in the branching juncture of a circular-section channel
The paper presents the results of a computational and experimental studies of a flow with local turbulence in the branching juncture of a channel with a round cross-section for the inlet Reynolds number Re = 1475 and for equal flow rates in two branches. The numerical solution of the problem has been obtained by the LES technique using the Germano – Lilli dynamic model for estimating the subgrid viscosity. The experiment used the SIV method. The calculated and experimental data in agreement showed that a jet-flow zone and a recirculation one were distinguished in the flow, directly in the branching juncture both in the forward and in the side channels. Turbulent stresses were significant in magnitude only in the channel section about four gauges long. Downstream, the flow in both channels was relaminarized.
10.18721/JPM.15406
532.542.4
blood flow branching
local turbulence
large eddy simulation
SIV measurements
https://physmath.spbstu.ru/article/2022.61.6/
06_81-94_15(4)2022.pdf
RAR
RUS
95-103
Mansoor
Riyadh
Al-Muthanna University, College of Engineering
As Samawah, 66002, Iraq
Abed
Ahmed
College of Engineering of University of Thi-Qar
Ahmed-k@thqu.edu.iq
Nasiriyah, 64002, Iraq
Dakhil
Tahseen
Al-Muthanna University
tah201122@yahoo.com
As Samawah, 66002, Iraq
Al-Khursan
Amin
Nanotechnology Research Laboratory (NNRL), College of Science, University of Thi-Qar
ameen_2all@yahoo.com
Nasiriyah, 64002, Iraq
Localized surface plasmons of gold nanoparticles
In this paper, gold nanoparticle far-field and near-field optical responses are studied and simulated numerically. The electromagnetic field was excited by an electric dipole near one end of the nanorod, which is used to model the emission of a quantum dot. Another excitation method was also simulated in which an incident plane wave is used. The excitation of dark plasmon modes of the gold nanorod is presented. The Poynting equation was solved numerically to study the influence of the gold nanorod on the dipole radiative power. In addition, the extinction cross-section of the gold nanoparticle illuminated by the incident plane wave was calculated to estimate the amount of the scattered and absorbed light.
10.18721/JPM.15407
535.36, 535.36:546.59
biosensing
extinction cross section
nanoparticle
plasmon
Raman scattering
https://physmath.spbstu.ru/article/2022.61.7/
07_95-103_15(4)2022.pdf
RAR
RUS
104-113
Pshchelko
Nikolay
Military Academy of Communications Named after Marshal of Soviet Union S. M. Budyonny
nikolsp@mail.ru
Tsareva
Olga
Peter the Great St. Petersburg Polytechnic University
olyalelya_89@mail.ru
The technique of determining the small angular deviations by an electrostatic sensor
Some methods for determining small angular deviations have been considered on the example of building objects. The design of an electrostatic cylindrical sensor was put forward, and the use of force action of an electric field was proposed in order to increase the sensitivity of the sensor. The main structural elements of the sensor are a plumb-line weighted at one end and a cylinder surrounding it. The conditions of equilibrium and instability of the position of the plumb arising due to positive feedback in the electric field were considered. An estimated calculation of the time of movement of the plumb until the moment of its touching the inside of the cylinder was made. The calculation result could be taken as a starting point for finding the desired angular deviation. The inaccuracy in the manufacture of the device and the random factors were noted to become influential at small deviations. The paper proposed some ways to solve these problems.
10.18721/JPM.15408
537.29
angular deviation
roll
electric field
electrostatic force
unstable equilibrium
motion time
calculation
https://physmath.spbstu.ru/article/2022.61.8/
08_104-113_15(4)20222.pdf
RAR
RUS
114-128
Savchenko
Ekaterina
Peter the Great St. Petersburg Polytechnic University
tato_ks@mail.ru
Tkach
Olga
Peter the Great St. Petersburg Polytechnic University
milatkach70@mail.ru
Karseeva
Elina
Peter the Great St. Petersburg Polytechnic University
elina.nep@gmail.com
The high-performance laser ELS method for analyzing the aggregation stability in colloidal solutions of nanoparticles
In the paper, modification of the electrophoretic light scattering (ELS) method for improving an accuracy of determining the electrophoretic mobility and zeta potential of nanoparticles in colloidal systems has been put forward. The modification included the creation of an original experimental setup operating in the heterodyne mode using a multimode fiber at the input of the recording unit, an increase in the signal-to-noise ratio of the system, and also an expansion of ranges of nanoparticles’ key parameters: sizes, electrical conductivity, concentration in solution. The theoretical substantiation for processing the scattering signal of polydisperse colloidal solutions of nanoparticles and calculating the electrophoretic mobility and zeta potential of colloidal systems was given. The high accuracy of the measured parameters was achieved, in comparison with the data obtained from the ZetaSizer Nano commercial device.
10.18721/JPM.15409
35.015, 535.8
zeta potential
electrophoretic mobility
electrophoresis
dynamic light scattering
heterodyne mode
colloids
nanoparticles
https://physmath.spbstu.ru/article/2022.61.9/
09_114-128_15(4)2022.pdf
RAR
RUS
129-146
0000-0001-5988-1429
Liokumovich
Leonid
Peter the Great St. Petersburg Polytechnic University
leonid@spbstu.ru
Ushakov
Nikolai
Peter the Great St. Petersburg Polytechnic University
n.ushakoff@spbstu.ru
Markvart
Aleksandr
Peter the Great St. Petersburg Polytechnic University
markvart_aa@spbstu.ru
Evdokimenko
Ekaterina
Peter the Great St. Petersburg Polytechnic University
evdokimenko.97@inbox.ru
The spectral characteristics of a multilayer extrinsic fiber Fabry – Perot interferometer
The paper describes the development of an analytical response model of an extrinsic fiber Fabry – Perot interferometer with a multilayer cavity in case of spectral interrogation. The system of equations allowing to calculate the spectral characteristic S(λ) of such interferometer has been derived under assumption of a single reflection from each of the layer surfaces. Moreover, the key parameters of the interferometer, namely, the layer refractive indices, the reflections of coatings, the layer thicknesses and the light loss in layers were taken into account as well. The light propagation inside the interferometer cavity was analyzed in terms of the Gaussian beam model. The features of the frequency analysis of the S(λ) oscillations were also considered. As an example, the obtained equations were used for evaluation of a two-layer extrinsic fiber Fabry – Perot interferometer design.
10.18721/JPM.15410
535.3, 535-15, 535.417
extrinsic fiber Fabry – Perot interferometer
spectral characteristic of interferometer
multilayer interferometer
https://physmath.spbstu.ru/article/2022.61.10/
10_129-146_15(4)2022.pdf
RAR
RUS
147-155
Zolotorevsky
Nikolai
Peter the Great St. Petersburg Polytechnic University
zolotorevsky@phmf.spbstu.ru
Rybin
Vladislav
vlad_rib@mail.ru
Ushanova
Elina
NRC "Kurchatov Institute" - CRISM "Prometey",
elinaus@mail.ru
Perevezentsev
Vladimir
Institute for Problems in Mechanical Engineering of RAS (the branch of Institute of Applied Physics of RAS)
v.n.perevezentsev@gmail.com
The effect of crystallographic texture formation on the features of microstructure evolution in tensile-strained copper
The microstructural evolution of a commercially pure copper specimen deformed by uniaxial tension has been studied using electron backscatter diffraction (EBSD). In the specimen deformed up to fracture, some areas (in the neck) corresponding to various strain degrees were examined. This allowed us to study the microstructure obtained for strain degrees in the range from 0,45 to 1,15 on the single sample. A texture consisting of two components with prevailing orientations of [100] and [111] directions, parallel to the tensile axis, formed concurrently with the deformation microstructure. The grains of the [111] component were shown to retain rather uniform orientation at strain degrees of about 1. At the same time, the grains of the [100] component subdivided gradually into highly disoriented fragments. The obtained results were discussed in terms of polycrystalline material micromechanics.
10.18721/JPM.15411
548.4, 548.74
plastic deformation
polycrystal
copper
microstructure
texture
fragmentation
EBSD analysis
https://physmath.spbstu.ru/article/2022.61.11/
11_147-155_15(4)2022.pdf
RAR
RUS
156-169
57034855700
0000-0002-4088-4707
Antonov
Valerii
Peter the Great St. Petersburg Polytechnic University
hmath@spbstu.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
Malykhina
Galina
Peter the Great St. Petersburg Polytechnic University
g_f_malychina@mail.ru
Semenyutin
Vladimir
Almazov National Medical Research Centre
lbcp@mail.ru
Fractal analysis in the study of the regulation of cerebral circulation
A mathematical model of autoregulation of cerebral circulation in the human body for obtaining additional information to make decisions about choosing a treatment plan has been presented in the paper. The fractal analysis methods based on wavelet leaders, which made it possible to expand the traditional approach to assessing the interaction between systemic arterial pressure and linear blood flow velocity formed the basis of the developed nonlinear model of autoregulation. The application of the developed methods to assessing the state of the autoregulation system in a healthy volunteer and a patient with cerebral pathology was exemplified.
10.18721/JPM.15412
57.087
autoregulation of cerebral blood flow
mathematical model
fractal analysis
wavelet leader
https://physmath.spbstu.ru/article/2022.61.12/
12_156-169_15(4)2022.pdf