2304-9782, 2618-8686, 2405-7223
St. Petersburg Polytechnic University Journal: Physics and Mathematics
16
1.2
2023
1-565
CNF
RUS
10-17
0000-0001-6869-1213
Alferov University
Vyacheslavova
Ekaterina
cate.viacheslavova@yandex.ru
0000-0002-0061-6687
Alferov University
Uvarov
Alexander
lumenlight@mail.ru
Alferov University
Neplokh
Vladimir
vneplox@gmail.com
St. Petersburg, Russian Federation
0000-0002-3503-7458
St. Petersburg Electrotechnical University "LETI"
Maksimova
Alina A.
deer.blackgreen@yandex.ru
0000-0002-4894-6503
Alferov University
Baranov
Artem I.
baranov_art@spbau.ru
St. Petersburg, Russian Federation
0000-0002-7632-3194
Alferov University
Gudovskikh
Alexander
gudovskikh@spbau.ru
Flexible solar cells based on PEDOT:PSS and vertically aligned silicon structures
Photovoltaic properties of hybrid solar cells based on poly-(3,4 ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) and Si nanowires (SiNWs) are studied. High values of the open circuit voltage (VOC) and external quantum efficiency (EQE) at short wavelength region obtained for planar solar cells indicate sufficient passivation properties of n-Si/PEDOT:PSS interface. A technology for filling SiNWs (6 µm in height and 1.7 µm in diameter) with PEDOT:PSS has been developed using G-coating. Compared with planar hybrid cell, SiNWs/PEDOT:PSS cell exhibit lower total reflectance (~ 12%) and higher EQE in the long wavelength region. It should be stressed that an increase in the PEDOT:PSS layer thickness by the combination of the G-coating and spin coating methods does not affect the short wavelength region of EQE. This fact is important for development of flexible solar cells based on SiNWs.
10.18721/JPM.161.201
621.383.51
solar cell
silicon nanowires
PEDOT:PSS
flexibility
https://physmath.spbstu.ru/article/2023.64.1/
01_10-17_16(1_2)2023.pdf
CNF
RUS
18-24
Ioffe Institute
Zabello
Konstantin
zabellok@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Barinov
Yury
yury@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Logachev
Alexander
logatchev@mail.ioffe.ru
St. Petersburg, Russian Federation
Switchgear design bureau LTD
Poluyanova
Irina
pin@tavrida.com
Sevastopol, Russian Federation
Ioffe Institute
Sherstnev
Evgeniy
89045512456@ya.ru
St. Petersburg, Russian Federation
Ioffe Institute
Shkol’nik
Sergey
shkolnik@mail.ioffe.ru
St. Petersburg, Russian Federation
Radiative energy losses of a high-current vacuum arc with an eroding anode
The results of measurements of the radiation power of a vacuum (p ~ 10‒4 Pa) arc in the near infrared, visible and ultraviolet regions of the spectrum (200 nm ≤ λ ≤ 1100 nm) are presented. The arc burned on industrial AMF-electrodes with a diameter of 55 mm. The material of the electrodes was the CuCr30 composition. The arc was fed by a current pulse in the shape close to half of the industrial frequency sine wave (f = 50Hz). The radiation was output through one of the side windows of the vacuum chamber. The window was made of quartz KU-1. The radiation receiver was a silicon photodiode with a diameter of 1.2 mm, located outside the vacuum chamber on an axis intersecting with the axis of symmetry of the discharge in the center of the interelectrode gap. The signal from the photodiode was taken through an amplifier and recorded on an oscilloscope. Considering the spectral sensitivity of the diode, two series of measurements were made: measurements without a filter and through a ZhS-10 yellow filter that cuts off radiation with λ ≤ 400 nm. The results obtained made it possible to analyze the dependence of the radiation power on the arc current at different stages of its development. The results showed that at high currents in the developed vacuum arc with anodic activity (eroding anode), a significant part (up to 15%) of the power released in the arc is transferred by radiation.
10.18721/JPM.161.202
533
vacuum arc
axial magnetic field
radiation power
https://physmath.spbstu.ru/article/2023.64.2/
CNF
RUS
25-31
Ioffe Institute
Gerasimenko
Aleksandr
gerasimenko.alexander@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Kuznetsov
Victor
victor.kuznetsov@mail.ioffe.ru
St. Petersburg, Russian Federation
Effect of an external circuit on the stability of thermionic energy converter steady states
The possibility of creating an alternating current source based on a thermionic energy converter is because, under certain conditions, an electron instability can develop in such a diode in the collisionless mode, leading to a sharp current cut-off. To implement this effect, it is enough to short electrodes through inductance. To select the optimal operation mode of the generator, it is necessary to study external inductance influence on the development of the instability. This problem is theoretically studied in the proposed work, and both over-neutralized and under-neutralized modes are considered. Dispersion equations are obtained. It is shown that when external inductance is included an instability threshold can be moved below the Pierce one. Besides, this type of instability can develop only for inductance values from a limited range.
10.18721/JPM.161.203
537.5
thermionic energy converter
plasma diodes
https://physmath.spbstu.ru/article/2023.64.3/
CNF
RUS
32-38
Ioffe Institute
Bakaleinikov
Leonid
bakal.ammp@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Kuznetsov
Victor
victor.kuznetsov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Flegontova
Ekaterina
St. Petersburg, Russian Federation
Stability features of inhomogeneous steady-state potential distributions in diode with counter-streaming electron and ion flows
This paper continues studying stability features of steady states of a diode with counter-streaming electron and ion flows. In our recent paper, an integral-differential equation for the potential perturbation amplitude in the mode without potential barriers reflecting charged particles within the plasma was derived. Its exact solution was found for homogeneous steady-state field distribution. In this paper, we propose a semi-analytical method to solve the integral-differential equation for potential perturbation amplitude in the case of inhomogeneous steady-state solutions. It is based on the use of the piecewise linear approximation of the integral operator kernel and the variable coefficient as well as the potential perturbation distribution. A dispersion equation is obtained and five first dispersion branches are constructed. As a result, we have proved that all steady state potential distributions with the values of dimensionless inter-electrode gap up to 10π/√2 are unstable. Numerical calculations of the potential perturbation development confirm analytical results.
10.18721/JPM.161.204
533.9
plasma diode
electron and ion flows
plasma instability
https://physmath.spbstu.ru/article/2023.64.4/
CNF
RUS
39-46
Ioffe Institute
Kolosko
Anatoly
agkolosko@mail.ru
St. Petersburg, Russian Federation
Ioffe Institute
Filippov
Sergey
s.filippov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Popov
Eugeni
e.popov@mail.ioffe.ru
St. Petersburg, Russian Federation
Methods for processing field emission glow patterns to obtain the I–V characteristics of individual emission sites
The work describes the features of processing glow patterns of the field emission projector when obtaining local I–V characteristics of individual emission sites. The features of constructing such dependencies are shown with the example of an experiment with a nanocomposite field emitter. The main factors influencing the analysis of glow patterns are discussed: the illumination effect, the halo effect, adsorption-desorption processes, vacuum discharges, burnout and contamination of the phosphor screen. Algorithms for reducing these effects with the computer processing of experimental data are described.
10.18721/JPM.161.205
537.533.2
field emission
emission glow patterns
local current-voltage characteristics
https://physmath.spbstu.ru/article/2023.64.5/
CNF
RUS
47-51
0000-0003-4858-7544
Ioffe Institute
Kalinovskii
Vitaliy
vitak.sopt@mail.ioffe.ru
St. Petersburg, Russian Federation
0000-0002-5226-1101
Ioffe Institute
Terukov
Evgenyi
eug.terukov@mail.ioffe.ru
St. Petersburg, Russian Federation
0000-0003-1812-3714
Ioffe Institute
Kontrosh
Evgeniy
kontrosh@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Yuferev
Valentin
valyuf.ammp3@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Prudchenko
Kseniia
prudchenkokk@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Terukova
Ekaterina
e.terukova@hevelsolar.com
St. Petersburg, Russian Federation
Ioffe Institute
Tolkachev
Ivan
TolkachevIA@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Koksharov
Egor
egor.koksharov.99@mail.ru
St. Petersburg, Russian Federation
Ioffe Institute
Pavlova
Ekaterina
kate.pavlova99@yandex.ru
St. Petersburg, Russian Federation
Chekalin
Alexander
chekalin@mail.ioffe.ru
Ioffe Institute
Goncharov
Sergey
Goncharov@mail.ioffe.ru
St. Petersburg, Russian Federation
Energy–informational hybrid photovoltaic converter of laser radiation
The possibility of efficient conversion of constant laser radiation using α–Si:H/c–Si structures in the transparency window of the Earth’s atmosphere at wavelength 1.06 μm is shown for the first time. A hybrid photovoltaic converter based on α–Si:H/c–Si cells and AlGaAs/GaAs photodetectors has been developed and manufactured. The photoelectric converter provides simultaneous conversion of radiation from two types of laser sources in the photovoltaic mode: continuous at a wavelength of 1.06 μm with an efficiency of ~ 26% and pulsed at a wavelength of 0.78 μm of ≤ 900 ps FWHM.
10.18721/JPM.161.206
620.91
laser radiation
transparency window
hybrid photovoltaic converter
AlGaAs/GaAs photodetectors
α–Si:H/c–Si structures
https://physmath.spbstu.ru/article/2023.64.6/
CNF
RUS
52-58
Ioffe Institute
Prudchenko
Kseniia
prudchenkokk@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Terukova
Ekaterina
e.terukova@hevelsolar.com
St. Petersburg, Russian Federation
0000-0003-1812-3714
Ioffe Institute
Kontrosh
Evgeniy
kontrosh@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Tolkachev
Ivan
TolkachevIA@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Koksharov
Egor
egor.koksharov.99@mail.ru
St. Petersburg, Russian Federation
Ioffe Institute
Pavlova
Ekaterina
kate.pavlova99@yandex.ru
St. Petersburg, Russian Federation
0000-0003-4858-7544
Ioffe Institute
Kalinovskii
Vitaliy
vitak.sopt@mail.ioffe.ru
St. Petersburg, Russian Federation
0000-0002-5226-1101
Ioffe Institute
Terukov
Evgenyi
eug.terukov@mail.ioffe.ru
St. Petersburg, Russian Federation
Photovoltaic characteristics of HJT photo converters of laser radiation at a wavelength of 1064 nm
The possibility of efficient conversion of continual infrared laser radiation by heterojunction technology a-Si:H/c-Si photovoltaic converters is demonstrated. The photovoltaic characteristics of eight different types of heterojunction structures were investigated. The photovoltaic converters of the n-α-Si/n-c-Si/p-α-Si heterojunction structure with contact grid Ag turned out to be the best in terms of dark currents, external quantum efficiency, I-V characteristics, and conversion efficiency of laser radiation with 1064 nm wavelength at a power density up to 2 kW/m2. The maximum efficiency ~ 24.5% of this structure was reached at power density of 1 kW/m2.
10.18721/JPM.161.207
620.92, 621.382
heterojunction technology solar cells
free space optics
high-power laser radiation converters
region of optical transparency of the atmosphere
https://physmath.spbstu.ru/article/2023.64.7/
CNF
RUS
59-63
Ioffe Institute
Panchak
Alexander
a.panchak@mail.ioffe.ru
St. Petersburg, Russian Federation
Shvarts
Maxim
Shvarts M.Z.
Structural stresses and temperature budget in III-V photoconverters with a thin Ge substrate
In high illumination conditions for photovoltaic converters, it is possible to stabilize the temperature of the photoactive region using a heatsink with high thermal conductivity, and by thinning the substrate that is a holder for semiconductor structure. However, the use of both methods together can lead to significant increase of the possible fragility of the converter. This work is devoted to the searching of balance between brittleness and overheating of GaAs/Ge solar cells installed on a copper heatsink with ceramic intermedia. Such composite heatsink, on the one hand, reduces mechanical stresses in the semiconductor, but, on the other hand, makes better the heat removal mode.
10.18721/JPM.161.208
536.416, 536.2.022
photovoltaic cells
temperature overheating
mechanical stress
thinning substrate
https://physmath.spbstu.ru/article/2023.64.8/
CNF
RUS
64-69
Ioffe Institute
Filippov
Sergey
s.filippov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Popov
Eugeni
e.popov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Kolosko
Anatoly
agkolosko@mail.ru
St. Petersburg, Russian Federation
Functional dependence of the notional area of field emission
Concepts and basic methods for extracting notional, formal and effective emission areas are considered. A functional dependence of the notional emission area on the field is obtained, taking into account the shape of the emitter. An analysis of the current-voltage characteristics in semi-logarithmic coordinates ln(I/Uk) vs 1/U, called “k-power plot”, is proposed, which makes it possible to take into account the shape of the emitter, to linearize the dependence, and, therefore, to obtain effective values of the field enhancement independent of the voltage range.
10.18721/JPM.161.209
537.533.2
field emission
effective parameters
emission area
field enhancement factor
https://physmath.spbstu.ru/article/2023.64.9/
CNF
RUS
70-76
0000-0003-4457-8149
Ioffe Institute
Shabunina
Evgeniia
St. Petersburg, Russian Federation
Ivanov
Alexey
alexey.ivanov86@gmail.com
Talnishnikh
N.A.
Nadya.FEL@mail.ru
Ioffe Institute
Kartashova
Anna
anna_kartashova@mail.ru
St. Petersburg, Russian Federation
Ioffe Institute
Poloskin
Dmitry
Dmitrii.Poloskin@mail.ioffe.ru
St. Petersburg, Russian Federation
Shmidt
Natalia
Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS
Zakgeim
Alexander
zakgeim@mail.ioffe.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya, 26
Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS
Chernyakov
Anton
chernyakov.anton@yandex.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya, 26
Mechanisms leading to thermal quantum efficiency droop in green InGaN/GaN LEDs
The contribution of several mechanisms into the external quantum efficiency (EQE) droop in green InGaN/GaN LEDs over a temperature increase from 300 to 400 K is clarified. One of them is the ionization of atoms localized at disordered hetero-interfaces in InGaN/GaN MQWs situated at the depletion region around a p-n junction at j < 10 A/cm2 and U < Utr (turn on voltage). The ionized atoms capture tunneling charge carriers, which leads to EQE decrease. Another mechanism is the capture of charge carriers tunneling in 3D spaces of MQWs situated outside of a depletion region at U > Utr and 10 A/cm2 < j < 30 A/cm2. Growing thermalized carriers concentration reduces the band fluctuation potential which results in vertical diffusion transport of carriers and crowding effect.
10.18721/JPM.161.210
53.043
InGaN/GaN
LEDs
external quantum efficiency
https://physmath.spbstu.ru/article/2023.64.10/
CNF
RUS
77-82
Mintairov
Mikhail
mamint@mail.ioffe.ru
Ioffe Institute
Evstropov
Valerii
vvevstropov@gmail.com
St. Petersburg, Russian Federation
Mintairov
Sergei
mintairov@scell.ioffe.ru
Shvarts
Maxim
Shvarts M.Z.
Kalyuzhniy
Nikolai
nickk@mail.ioffe.ru
Dominant recombination in a GaAs solar cell through a compressed GaAs/In0.4Ga0.6As/GaAs quantum well
The paper is devoted to the study of the reasons for the increase in the saturation current of a p–n junction when quantum objects (quantum dots, wells, and others) are introduced into it. An assumption has been made and verified that quantum objects create additional recombination centers in the matrix material of p–n junction. For this case, a model is presented that describes the behavior of the electroluminescence quantum yield. It is shown that the model is applicable to the description of the experimental temperature dependence of electroluminescence intensity when constant current passing through a p–n junction with quantum objects. The experiment was carried out for GaAs solar cells with different numbers (1, 5, 10) of Ga0.6In0.4As compressed well-like (hybrid) quantum objects. The fundamental parameters of the studied quantum objects are determined. In was shown that the assumption about additional recombination centers can be one of the explanations for the experimentally observed increase in the saturation current of the p-n junction with quantum objects
10.18721/JPM.161.211
620.3, 620.9, 539.23, 621.315.592
solar cells
quantum wells
saturation current
https://physmath.spbstu.ru/article/2023.64.11/
CNF
RUS
83-89
Ioffe Institute
Strel'chuk
Anatoly
anatoly.strelchuk@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Kalinina
Evgenia
evk@mail.ioffe.ru
St. Petersburg, Russian Federation
Current-voltage characteristics of Cr/SiC(4H) Schottky diodes
Forward and reverse current-voltage characteristics (I–V ) of Cr/SiC(4H) Schottky diodes (SDs) manufactured using the same technology based on a single weakly-doped (~ 4·1014 cm-3) epilayer are investigated. SDs are close to ideal, but a significant spread of I–V and excess current which sometimes unstable were found, unrelated to the difference in the area of the SDs. Investigation in the temperature range 20–210 °C revealed the annealing effect and allowed to estimate the potential barrier height of different diodes before and after annealing. It is suggested that the main diode is shunted by a parasitic diode, which determines forward I–V in the region of I–V exponential dependence.
10.18721/JPM.161.212
53.03, 53.04, 538.9
SiC
Schottky diodes
current-voltage characteristics
spread
defects
https://physmath.spbstu.ru/article/2023.64.12/
CNF
RUS
90-95
Ioffe Institute
Smirnova
Evgenia
esmirnova@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Chepurnaya
Irina
ichepurnaya@mail.ioffe.ru
St. Petersburg, Russian Federation
In situ conductance studies of electrochemically doped polymer thin films based on nickel-salen complexes
Modulation of the electron transport properties of metallopolymers based on nickel-salen complexes N,N′-bis(salicylidene)ethylenediaminonickel(II) and N,N′-bis(3-methoxysalicylidene)ethylenediaminonickel(II) upon electrochemical p-doping was studied by in situ conductance measurements in an organic electrochemical transistor configuration. Both polymers showed bell-shaped conductance profiles upon positive voltage bias; the results were interpreted using the mixed-valence conductivity model. The electrochemical doping of the methoxy-substituted polymer film resulted in a change in its electrical conductance by four orders of magnitude, which indicates its potential suitability as a channel material for electrochemical transistors. Electrochemical quartz crystal microbalance studies confirmed mixed ionic-electronic transport in this polymer film and revealed different regimes of ion and solvent transfer in the polymer at different doping levels.
10.18721/JPM.161.213
544.6, 621.382
conducting metallopolymer
electrochemical doping
nickel-salen complex
in situ conductance measurements
electrochemical quartz crystal microbalance
organic electrochemical transistor
https://physmath.spbstu.ru/article/2023.64.13/
CNF
RUS
96-102
Ioffe Institute
Ivanov
Aleksandr
post@mail.Ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Klochkov
Aleksandr
alex.klo@mail.ioffe.ru
St. Petersburg, Russian Federation
Change of radiative and low-frequency noise characteristics of UV LEDs based on InGaN/GaN quantum wells at liquid nitrogen temperature
The results of temperature studies of UV-band LEDs based structures with InGaN/GaN quantum wells are presented. At room temperature and liquid nitrogen temperature, volt-ampere characteristics, frequency dependences of low-frequency noise density, external quantum efficiency, and optical power were measured. The performed studies showed differences in the characteristics of UV LEDs at temperatures T = 77.4 K from those at T = 295 K. The possible physical mechanisms of the formation of low-frequency current noise, carrier transport, and the effect on the external quantum efficiency of the processes of radiative and non-radiative recombination at two temperatures are considered.
10.18721/JPM.161.214
538.9
external quantum efficiency
density of current noise
tunneling current
https://physmath.spbstu.ru/article/2023.64.14/
CNF
RUS
103-107
Shkoldin
Vitaliy A.
shkoldin@spbau.ru
Lebedev
Denis
denis.v.lebedev@gmail.com
Permyakov
Dmitry
d.permyakov@metalab.ifmo.ru
Golubok
Alexander
aogolubok@mail.ru
0000-0002-3321-7797
Peter the Great St. Petersburg Polytechnic University
Arkhipov
Alexander
arkhipov@rphf.spbstu.ru
Samusev
Anton
a.samusev@metalab.ifmo.ru
0000-0001-9792-045X
Peter the Great St. Petersburg Polytechnic University
Mukhin
Ivan
muhin_is@spbstu.ru
Fabrication of silicon optical nanoantennas by ultrahigh vacuum STM lithography
The paper reports on experiments on the observation of scanning tunnel microscope (STM)-induced light emission (STM-LE) from bare silicon surfaces and modified with STM lithography. We produced nanoscale hillocks (nanokhobs) on a crystalline Si substrate, which can be considered as nanoantennas enhancing STM-LE effect. Our experiments show that the nanoknobes formed on the surface of the original substrate did not provide the achievement of the goal. However, in-situ deposition of a 10 nm thick additional layer of undoped Si resulted in the increase of STM-LE quantum efficiency by an order of magnitude in comparison with original substrate. This effect paves the way for the fabrication of nanoscale electrically-driven light sources required for hybrid optoelectronic chips.
10.18721/JPM.161.215
681.7.069.24
scanning tunneling microscopy
tunnel contact
emission from a tunnel contact
silver film
photonics
ultrahigh vacuum
https://physmath.spbstu.ru/article/2023.64.15/
CNF
RUS
108-113
Dragunova
Anna
anndra@list.ru
Kryzhanovskaya Natalia V.
Natalia
nkryzhanovskaya@hse.ru
Zubov
Fedor
fzubov@hse.ru
0000-0003-3686-935X
National Research University “Higher School of Economics” (St. Petersburg branch)
Moiseev
Eduard
emoiseev@hse.ru
Nadtochiy
Alexey
al.nadtochy@mail.ioffe.ru
Fominykh
Nikita A.
nfominykh@hse.ru
Ivanov
Konstantin
kivanov@hse.ru
Maximov
Mikhail
maximov @beam.ioffe.ru
Alferov University
Vorobyev
Alexandr
alex.spbau@mail.ru
St. Petersburg, Russian Federation
0000-0002-8661-4083
Alferov University
Mozharov
Alexey
mozharov@spbau.ru
St. Petersburg, Russian Federation
Kalyuzhniy
Nikolai
nickk@mail.ioffe.ru
Ioffe Institute
Gordeev
Nikita
St. Petersburg, Russian Federation
Guseva
Yulia
Guseva.Julia@mail.ioffe.ru
Kulagina
Marina M.
Marina.Kulagina@mail.ioffe.ru
35379962200
Ioffe Physical Technical Institute of the Russian Academy of Sciences
Zhukov
Alexey
zhukov@beam.ioffe.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya 26
Thermal characteristics of III-V microlasers bonded onto silicon board
In this work, we study the characteristics of semiconductor microlasers based on the heterostructure with two coupled waveguides intended to improve heat dissipation in cw regime. We analysed total output optical loss of the microlasers, their spectral characteristics, output power, emission pattern and thermal resistance. We observed that the use of the principle of two coupled resonant planar waveguides, active and passive, as well as p-side down bonding, significantly reduces the thermal resistance of microlasers and improves their performance.
10.18721/JPM.161.216
538.958
hybrid integration
microlaser
quantum well dots
thermal resistance
https://physmath.spbstu.ru/article/2023.64.16/
CNF
RUS
114-120
0000-0002-7025-3527
National Research University “Higher School of Economics”
Komarov
Sergey
serega.komarow@mail.ru
St. Petersburg, Russian Federation
Gridchin
Vladislav
gridchinvo@gmail.com
Lendyashova
Vera
erilerican@gmail.com
Kotlyar
Konstantin
konstantin21kt@gmail.com
Reznik
Rodion
moment92@mail.ru
Dvoretskaya
Nataliya
nat@rphf.spbstu.ru
Dragunova
Anna
anndra@list.ru
National Research University ‘Higher School of Economics”
Makhov
Ivan
imahov@hse.ru
Nadtochiy
Alexey
al.nadtochy@mail.ioffe.ru
Kryzhanovskaya Natalia V.
Natalia
nkryzhanovskaya@hse.ru
Cirlin
George
george.cirlin@mail.ru
35379962200
Ioffe Physical Technical Institute of the Russian Academy of Sciences
Zhukov
Alexey
zhukov@beam.ioffe.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya 26
Optical properties of single InGaN nanowires with core-shell structure
In this work, the photoluminescence of single InGaN NWs with a core-shell structure is investigated along their entire length at RT and 77 K. Multicolor emission, covering the spectral range from 380 to 650 nm, was obtained and described in details. Using the modified Vegard’s law, the photoluminescence lines were correlated with the InGaN composition. Based on these results, conclusions about the structural properties and homogeneity of the InGaN NWs along their length were carried out.
10.18721/JPM.161.217
535
nanowires
core-shell structure
III-V semiconductors
https://physmath.spbstu.ru/article/2023.64.17/
CNF
RUS
121-125
Tomsk State University of Control Systems and Radioelectronics
Romanenko
Dmitry
romanenko_dima1999@mail.ru
Tomsk, Russian Federation
Tomsk State University of Control Systems and Radioelectronics
Shchukin
Alexander
mr.avshchukin@gmail.com
Tomsk, Russian Federation
Tomsk State University of Control Systems and Radioelectronics
Bodrenin
Victor
vebodrenin@inbox.ru
Tomsk, Russian Federation
Tomsk State University of Control Systems and Radioelectronics, V.E. Zuev Institute of atmospheric optics Russian academy of sciences, Siberian branch
Perin
Anton
perinas@bk.ru
Tomsk, Russian Federation
Estimation of the coupling efficiency of optically induced waveguides in a lithium niobate crystal
The paper presents the results of an experimental study of the efficiency of coupling of waveguide structures formed in a lithium niobate crystal by the optical induction method. The waveguides were produced by soliton laser beams with wavelengths of 532 and 457 nm at different optical powers. Estimation of the efficiency of coupling of the obtained structures for infrared radiation with a wavelength of 850 nm was more than 70%.
10.18721/JPM.161.218
535.215.6
lithium niobate
optical waveguide
photorefractive effect
pyroelectric effect
coupling efficiency
https://physmath.spbstu.ru/article/2023.64.18/
CNF
RUS
126-132
Fominykh
Nikita A.
nfominykh@hse.ru
Zubov
Fedor
fzubov@hse.ru
Ivanov
Konstantin
kivanov@hse.ru
0000-0003-3686-935X
National Research University “Higher School of Economics” (St. Petersburg branch)
Moiseev
Eduard
emoiseev@hse.ru
Nadtochiy
Alexey
al.nadtochy@mail.ioffe.ru
Mintairov
Sergei
mintairov@scell.ioffe.ru
Kalyuzhniy
Nikolai
nickk@mail.ioffe.ru
Melnichenko
Ivan
imelnichenko@hse.ru
0000-0002-8640-1707
Alferov University
Pirogov
Vladimir
vladimir.pirogov@metalab.ifmo.ru
St. Petersburg, Russian Federation
Alferov University
Scherbak
Sergey
sergeygtn@yandex.ru
Urmanov
Boris
boris-urmanov@mail.ru
Nahorny
Aliaksey
a.nahorny@ifanbel.bas-net.by
Kryzhanovskaya Natalia V.
Natalia
nkryzhanovskaya@hse.ru
35379962200
Ioffe Physical Technical Institute of the Russian Academy of Sciences
Zhukov
Alexey
zhukov@beam.ioffe.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya 26
Microring lasers with a waveguide coupler
In the present work, we study the possibility of the emission output of a semiconductor microring laser through a radially coupled optical waveguide. Room temperature lasing has been achieved in continuous wave regime with the wavelength of ~1090 nm. The characteristics of microlasers with and without waveguide have been compared. We have performed a spatial scanning with simultaneous detection of the laser radiation at an injection current above the threshold. We have observed an increase in the output power up to two times due to the use of a coupled waveguide.
10.18721/JPM.161.219
535.015
microlaser
microring resonator
quantum well-dots
coupled optical waveguide
https://physmath.spbstu.ru/article/2023.64.19/
CNF
RUS
133-138
Tomsk State University of Control Systems and Radioelectronics
Kuznetsov
Igor
kuznetsov.i.159@e.tusur.ru
Tomsk, Russian Federation
Tomsk State University of Control Systems and Radioelectronics, V.E. Zuev Institute of atmospheric optics Russian academy of sciences, Siberian branch
Perin
Anton
perinas@bk.ru
Tomsk, Russian Federation
Interference pattern analysis approach for sensory applications
This paper presents the results of a new approach to the analysis of interference patterns in the modulator output waveguide in a Mach-Zehnder interferometer configuration based on lithium niobate thin films. Interference patterns that occur in the output waveguide have been demonstrated. An approach of analysis of the patterns has been described. The method allows us to obtain information about the value of voltage applied to the arm of the interferometer and to double upper limit of measuring electric field strength using MZI based electro-optic modulator.
10.18721/JPM.161.220
535.215.6
Mach-Zehnder interferometer
interference pattern
electro-optic sensor
https://physmath.spbstu.ru/article/2023.64.20/
CNF
RUS
139-145
ITMO University
Iukhtanov
Nikita
nikita.yuhtanov@metalab.ifmo.ru
St. Petersburg, Russian Federation
ITMO University
Rybin
Mikhail
m.rybin@metalab.ifmo.ru
St. Petersburg, Russian Federation
High-index waveguides for propagation of electromagnetic waves with high transversal angular momentum
We study periodic waveguides of silicon cylinders for an optical isolator in the configuration of a Mach–Zehnder interferometer, as one of the possible applications in silicon photonics. Magneto-optical effect in silicon is considered under application of external magnetic field normal to the waveguide in the on-chip configuration that is Voight geometry. External magnetic field remains perpendicular to the direction of propagation of the electromagnetic wave for any direction of the waveguide on the surface, which allows us using a serpentine folding of waveguides. The nonzero integral electric field rotation in the plane of the waveguide is demonstrated. Our results uncover the possibility of using bare silicon as a magneto-optical material for optical isolators.
10.18721/JPM.161.221
537.874
electric field rotation
optical isolator
Voigt geometry
https://physmath.spbstu.ru/article/2023.64.21/
CNF
RUS
146-152
St. Petersburg Electrotechnical University "LETI"
Goryainov
Viktor
vsgoriainov@etu.ru
St. Petersburg, Russian Federation
St. Petersburg Electrotechnical University "LETI"
Antonenko
Kseniya
kgantonenko@yandex.ru
St. Petersburg, Russian Federation
St. Petersburg Electrotechnical University "LETI"
Khasenova
Mariyam
mariyam-98@mail.ru
St. Petersburg, Russian Federation
St. Petersburg Electrotechnical University "LETI"
Malyga
Mikhail
mmalyga@list.ru
St. Petersburg, Russian Federation
St. Petersburg Electrotechnical University "LETI"
Prosolov
Igor
prosolovigor@gmail.com
St. Petersburg, Russian Federation
Seasonal variations in optical attenuation spectra of some urban water bodies
Water samples were taken once a month from several urban water bodies, and using a laboratory setup with two concave mirrors and a fiber optic spectrometer attenuation spectra were obtained in visible and near infrared spectral range. Spectra approximation by a power law gave better fit, indicating the primary influence of scattering by non-algal particles on the total attenuation. Seasonal maximums of attenuation were observed in November and late in summer, attributed to detritus scatterings and algal bloom correspondingly. A negative correlation was found between the spectral slope parameter and the attenuation value at 550 nm, which means that spectra for more turbid samples were spectrally flatter in general.
10.18721/JPM.161.222
53.082.52
urban water bodies
minor water bodies
light attenuation spectra
seasonal variations
https://physmath.spbstu.ru/article/2023.64.22/
CNF
RUS
153-159
ITMO University
Andryushkin
Vladislav
vvandriushkin@itmo.ru
St. Petersburg, Russian Federation
Ioffe Institute
Blokhin
Sergei
blokh@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Bobrov
Mikhail
bobrov.mikh@gmail.com
St. Petersburg, Russian Federation
0000-0002-3449-8711
Ioffe Institute
Blokhin
Aleksey
Aleksey.Blokhin@mail.ioffe.ru
St. Petersburg, Russian Federation
Babichev
Andrei
scientific.ocean@gmail.com.
0000-0002-9448-2471
Connector Optics LLC
Gladyshev
Andrey
andrey.gladyshev@connector-optics.com
St. Petersburg, Russian Federation
ITMO University
Novikov
Innokenty
innokenty.novikov@itmo.ru
St. Petersburg, Russian Federation
ITMO University
Karachinsky
Leonid
lkarachinsky@itmo.ru
St. Petersburg, Russian Federation
ITMO University
Kolodeznyi
Evgenii
evgenii_kolodeznyi@itmo.ru
St. Petersburg, Russian Federation
JSC OKB-Planeta
Voropaev
Kirill
kirill.voropaev@novsu.ru
V. Novgorod, Russian Federation
0000-0002-0789-4241
Alferov University
Egorov
Anton
anton.egorov@connector-optics.com
St. Petersburg, Russian Federation
1300 nm VCSELS with active region based on InGaAs/InGaAlAs superlattice for long-distance transmission
We present the comprehensive study of laser performance of 1300 nm wafer-fused vertical-cavity surface-emitting lasers. Lasers with 5µm buried tunnel junction diameter demonstrate a stable single mode operation in the wide temperature range with maximal output optical power of 6 mW and above 1.5 mW at 20 °C and 80 °C respectively. Based on small-signal analysis the maximal modulation frequency of 8 GHz at 20 °C was estimated. Further increase of the temperature up to 85 °C led to dropping of maximal small-signal modulation frequency down to ~6 GHz at -3dB level despite of remaining of rather high current modulation efficiency about ~2.7 GHz/mA0.5.
10.18721/JPM.161.223
621.373.826
vertical-cavity surface-emitting lasers
molecular-beam epitaxy
buried tunnel junction
https://physmath.spbstu.ru/article/2023.64.23/
CNF
RUS
160-164
Ioffe Institute
Kognovitskii
Sergei
kogn@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Malevskiy
Dmitriy
dmalevsky@scell.ioffe.ru
St. Petersburg, Russian Federation
0000-0002-5226-1101
Ioffe Institute
Terukov
Evgenyi
eug.terukov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Yakovlev
Sergei
Yakovlev@gvg.ioffe.ru
St. Petersburg, Russian Federation
Power-communicating photo-receiving device
The work is devoted to the creation of a power-communicating photo-receiving device for an autonomous laser communication unit, designed to receive energy from powerful laser radiation and convert it into electricity, as well as for simultaneous registration of information high-frequency optical signals. The presented results demonstrate the possibility of photo-receiving device practical use in laser communication system, including power supplying of the active equipment.
10.18721/JPM.161.224
535.231.11
wireless power transmission
laser beam
photo-receiving device
photovoltaic cell
high-speed photodiode
https://physmath.spbstu.ru/article/2023.64.24/
CNF
RUS
165-171
Peter the Great St. Petersburg Polytechnic University
Aksenova
Valeriya
valeriya11-12@mail.ru
St. Petersburg, Russian Federation
JSC Koltsov’s Design Bureau
Mesh
Maxim
mesh@koltsov-kb.ru
St. Petersburg, Russian Federation
JSC Koltsov’s Design Bureau
Kolokolov
Daniil
k.d@koltsov-kb.ru
St. Petersburg, Russian Federation
JSC Koltsov’s Design Bureau
Kartseva
Tatyana
karceva.t@koltsov-kb.ru
St. Petersburg, Russian Federation
ITMO University
Fedorov
Nikifor
nfedorov@niuitmo.ru
St. Petersburg, Russian Federation
Ioffe Institute
Pavluchenko
Alexey
alexey.pavluchenko@gmail.com
St. Petersburg, Russian Federation
Decorative protective coatings produced by atomic layer deposition and calculation of their spectral characteristics
In this paper, we consider the possibilities of using the atomic layer deposition process for producing decorative coatings based on aluminum oxide and titanium oxide on steel parts. The parameters of coatings based on aluminum oxide and titanium oxide of different colors were calculated. The calculations of the coating color and its optical characteristics are shown, and it is found that the developed software allows you to calculate the color of the coating. The properties of the resulting coatings have been studied and it has been experimentally established that these coatings can be used for chemical protection of surfaces.
10.18721/JPM.161.225
535.415
aluminium oxide
protective coating
atomic layer deposition
titanium oxide
decorative coating
https://physmath.spbstu.ru/article/2023.64.25/
CNF
RUS
172-178
IPSI RAS – branch of the FSRC “Crystallography and Photonics” RAS; Samara National Research University
Savelyeva
Alexandra
lexis2450@gmail.com
Samara, Russian Federation
IPSI RAS – branch of the FSRC “Crystallography and Photonics” RAS; Samara National Research University
Kovalev
Alexey
alanko.ipsi@mail.ru
Samara, Russian Federation
IPSI RAS – branch of the FSRC “Crystallography and Photonics” RAS; Samara National Research University
Kozlova
Elena
kozlova.elena.s@gmail.com
Samara, Russian Federation
IPSI RAS – branch of the FSRC “Crystallography and Photonics” RAS; Samara National Research University
Kotlyar
Victor
kotlyar@ipsiras.ru
Samara, Russian Federation
Properties of the squared Laguerre–Gaussian vortices
In this paper, a new type of optical vortex called the squared Laguerre–Gauss (LG)2 vortex beam has been investigated. Theoretical conclusions and numerical experiment confirm that these beams are Fourier-invariant and retain their structure at the focus of a spherical lens. In the Fresnel diffraction zone, such a beam is transformed into a superposition of conventional LG beams, the number of which is equal to the number of rings in the (LG)2 beam. The presented beams are structurally stable in the case of one intensity ring.
10.18721/JPM.161.226
535
optical vortex
topological charge
Laguerre–Gauss mode
Fourier invariance
Fourier transform
Fresnel diffraction
https://physmath.spbstu.ru/article/2023.64.26/
CNF
RUS
179-184
Bondarenko
Dariya
bondarenko.dariya.spb@gmail.com
Gridchin
Vladislav
gridchinvo@gmail.com
Kotlyar
Konstantin
konstantin21kt@gmail.com
Reznik
Rodion
moment92@mail.ru
0000-0002-1571-209X
ITMO University
Kirilenko
Demid
demid.kirilenko@mail.ioffe.ru
St. Petersburg, Russian Federation
0000-0002-4894-6503
Alferov University
Baranov
Artem I.
baranov_art@spbau.ru
St. Petersburg, Russian Federation
Dragunova
Anna
anndra@list.ru
Kryzhanovskaya Natalia V.
Natalia
nkryzhanovskaya@hse.ru
0000-0002-3503-7458
St. Petersburg Electrotechnical University "LETI"
Maksimova
Alina A.
deer.blackgreen@yandex.ru
Cirlin
George
george.cirlin@mail.ru
Physical properties of GaN nanowires with core-shell InGaN/GaN insertions grown by PA-MBE on Si substrate
An approach to the fabrication of LED structure based on GaN nanowires with thick core-shell InGaN insertions with high indium content is studied. The results of optical measurements demonstrate the photoluminescence from the InGaN insertions in the green spectrum at room temperature. The study of electrical properties shows typical diode dependence. The results can be crucial for the development of light-emitting diodes on Si substrates.
10.18721/JPM.161.227
538.975
GaN/InGaN nanowires
micro light-emitting diodes
plasma-assisted molecular beam epitaxy
thick core-shell InGaN insertions
https://physmath.spbstu.ru/article/2023.64.27/
CNF
RUS
185-190
Peter the Great St. Petersburg Polytechnic University
Babich
Ekaterina
babich.katherina@gmail.com
Alferov University
Lubyankina
Ekaterina
katylubyankina@gmail.com
St. Petersburg, Russian Federation
University of Eastern Finland
Reduto
Igor
igor.reduto@uef.fi
Finland
Bottom-up approach to the formation of bi-resonant glass-metal nanocomposite
We demonstrate the bottom-up approach to the formation of a glass-metal nanocomposite. The approach is based on simultaneous diffusion of different metal ions in glass and the self-assembly of the reduced ions with the formation of metal nanoparticles. In particularly, the approach includes: sputtering of silver and gold thin films on the surface of the glass, embedding of silver and gold ions in glass via field-assisted ion-exchange (applying DC voltage to metal films) and annealing of the ions-enriched glass at the temperature above the glass transition temperature. The formed nanocomposite is glass substrate with the buried layers of gold and silver nanoparticles, which is characterized by two distinct optical resonances (bi-resonant nanocomposite). The influence of the parameters of the ion exchange (thickness of metal films, ratio of the metals, and applied voltage) and annealing (temperature and duration) on the formation of silver and gold nanoparticles and optical properties of the glass-metal nanocomposite is considered.
10.18721/JPM.161.228
53.097
glass-metal nanocomposite
field-assisted ion-exchange
nanoparticles
https://physmath.spbstu.ru/article/2023.64.28/
CNF
RUS
191-195
Ioffe Institute
Semakova
Antonina
antonina.semakova@mail.ioffe.ru
St. Petersburg, Russian Federation
Romanov
Vladimir
romanov@phmf.spbstu.ru
Bazhenov
Nikolai
bazhnil.ivom@mail.ioffe.ru
Mynbaev
Karim
mynkad@mail.ioffe.ru
Ioffe Institute
Moiseev
Konstantin
mkd@iropt2.ioffe.ru
St. Petersburg, Russian Federation
Stimulated emission from asymmetric InAs/InAsSb/InAsSbP LED heterostructures
Electroluminescent (EL) properties of asymmetrical InAs/InAs1-ySby/InAsSbP heterostructures with the y = 0.09 and y = 0.11 InSb content in the active layer were studied in wide temperature range T = 4.2–300 K. The stimulated emission in the spectral range 4.1–4.2 µm has been observed at low temperatures (T < 30 K). It was estimated that EL spectra were formed owing to different channels of radiative recombination depending on the ambient temperature. The influence of the quality of the type II InAsSb/InAsSbP heterojunction on radiative recombination transitions has been considered.
10.18721/JPM.161.229
538.9
light-emitting diodes
heterojunctions
InAs
antimonides
stimulated emission
https://physmath.spbstu.ru/article/2023.64.29/
CNF
RUS
196-203
Ioffe Institute
Boiko
Yuri
yuri.boiko@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Marikhin
Vyacheslav
v.marikhin@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Myasnikova
Lubov
liu2000@mail.ru
St. Petersburg, Russian Federation
Nanostructured high-strength high-modulus film polymer materials: statistical elastic and fracture mechanical properties
The statistical distributions of the mechanical properties (strength σ, strain at break εb, and Young’s modulus Е) of the high-strength high-modulus oriented thin films and fibers of polyamide-6 (PА-6) have been investigated. For this purpose, two types of the PA-6 samples have been selected: single thin threads and multifilament fibers consisting of some hundreds of individual fibers. The statistical analysis has been carried out on a large number of mechanical tests of identical samples (50 testing samples for each of the two sample types) using the Gaussian and Weibull’s models. Beside the ‘traditional’ mechanical properties (σ, εb, and Е) commonly used for materials characterization, two additional viscoelastic and fracture characteristics have been estimated and introduced when analyzing the stress-strain curve by taking its first derivative. These are the tangent to the linear viscoelastic portion of the stress-strain curve at relatively large strains (6–14%) and the deformation interval between εb and the strain value received by extrapolation of this curve portion to σ = 0, referred to as the apparent viscoelastic modulus (Е2) and apparent strain at break (εb-2), respectively. The similarities and differences of the statistical distribution behaviors of σ, εb, Е, Е2, and εb-2 for two PA-6 sample types investigated, including the applicability of the Gaussian and Weibull’s models, have been discussed.
10.18721/JPM.161.230
539.412.1
polyamide-6
fibers
mechanical properties
statistics
https://physmath.spbstu.ru/article/2023.64.30/
CNF
RUS
204-211
Ioffe Institute
Balashova
Elena
balashova@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Levin
Aleksandr
aleksandr.a.levin@mail.ioffe.ru
St. Petersburg, Russian Federation
St. Petersburg State University
Zolotarev
Andrey
a.zolotarev@spbu.ru
St. Petersburg, Russian Federation
Ioffe Institute
Krichevtsov
Boris
boris@mail.ioffe.ru
St. Petersburg, Russian Federation
0000-0003-1719-2179
Harbin Institute of Technology
Zhang
Hongjun
zhanghj@hit.edu.cn
Harbin, China
Harbin Institute of Technology
Li
Fangzhe
Harbin, China
0000-0002-5707-6212
Harbin Institute of Technology
Ke
Hua
hua_ke@hit.edu.cn
Harbin, China
Glycine and triglycine sulphate crystals doped with croconic acid: crystal structure, UV-VIS absorption, and dielectric properties
Single crystals of amino acid glycine (Gly) and triglycine sulphate (TGS) doped with organic croconic acid (CA) were synthesized by evaporation from aqueous solutions. Depending on the concentration of CA in the solution, Gly:CA crystalizes in structure of γ- (sp.gr. P31 (144)) or α- (P21/n (14)) polymorphs of glycine. TGS:CA crystallizes in ferroelectric (P21 (4)) TGS structure. X-ray phase analysis of single crystals and powders shows that the introducing of CA does not change the symmetry of the crystal lattices, but only slightly changes the volumes of the unit cells that is possible when small CA molecules enter the pores of crystal structures. Analysis of UV-Vis absorption spectra shows that CA doping leads to the appearance in Gly:CA and TGS:CA of new absorption bands placed in transparency region of pure TGS and Gly crystals. As compared to pure TGS the dielectric hysteresis loops of TGS:CA are characterized by increase of coercive field and decrease of switchable polarization.
10.18721/JPM.161.231
538.911
polymorphs
amino acid glycine
croconic acid
crystal structure
Powder XRD analysis
UV-Vis absorption spectra
dielectric properties
https://physmath.spbstu.ru/article/2023.64.31/
CNF
RUS
212-217
Kuban State University
Puzanovskiy
Kirill
puzanovsky.kv@yandex.ru
Krasnodar, Russian Federation
Kuban State University
Galutskiy
Valeriy
galutskiy17v@mail.ru
Krasnodar, Russian Federation
Kuban State University
Stroganova
Elena
stroganova@kubsu.ru
Krasnodar, Russian Federation
Temperature dependences of terahertz spectra of rutile grown by various methods
The paper presents measurements of the temperature dependence of the refractive index and the absorption coefficient in the THz range for rutile crystals grown by the cold container method. The obtained parameters are compared with the temperature behaviour of lithium niobate crystals, whose matrix allows significant deviations from stoichiometry. The coefficient of the temperature dependence of the refractive index of rutile crystals in the terahertz range is commensurate with that of heavily doped lithium niobate samples and is 3·10-3 K-1.
10.18721/JPM.161.232
535.3, 52-77
rutile
THz range
cold container method
stoichiometry
https://physmath.spbstu.ru/article/2023.64.32/
CNF
RUS
218-223
Southern Federal University
Kotosonova
Alena
alena.kotosonova@gmail.com
Rostov-on-Don, Russian Federation
Southern Federal University
Kolomiytsev
Alexey
askolomiytsev@sfedu.ru
Rostov-on-Don, Russian Federation
Southern Federal University
Soboleva
Olga
osotova@sfedu.ru
Rostov-on-Don, Russian Federation
Fabrication of nanoscale structures by FIB-induced deposition of materials and study of their electrical properties
Methods of local formation of nanoscale structures based on the application of focused ion beam open up new possibilities in terms of providing the necessary geometric parameters and ensuring the reproducibility of micro- and nanostructures, which contributes to the development of devices with previously unattainable characteristics. This paper presents the technological modes of formation of nanostructures with a height of 1 μm and diameters from 100 to 500 nm by the FIB method. The structures were formed by ion-induced deposition of carbon and tungsten, as well as electron-induced deposition of tungsten. A method for measuring the electrical parameters of high-aspect ratio structures based on an atomic force microscope (AFM) was proposed. The current value of 25 nA was obtained at 50 V. Threshold voltages for various nanostructures ranged from 7 to 32 V. The stability of structures to the electric field at voltages up to 50 V was investigated.
10.18721/JPM.161.233
621.38
nanotechnology
focused ion beam
beam-induced deposition
nanopatterning
https://physmath.spbstu.ru/article/2023.64.33/
CNF
RUS
224-228
Bessolov
Vasily
bes@triat.ioffe.ru
Konenkova
Elena
lena@triat.ioffe.ru
Rodin
Sergey
s_rodin77@mail.ru
Synthesis of semi-polar GaN(11-22) on a nano-patterned Si(113) substrate
A method for synthesising hexagonal GaN on a Si(113) substrate with a nanostructure of about 75 nm on its surface (NP-Si(113) substrate) is proposed. It has been established that the method of the metal-organic chemical vapor deposition on such a substrate makes it possible to form a semi-polar layer of GaN(11-22) with half-widths of the X-ray diffraction curve ωθ ~ 30 arcmin. It is shown that during epitaxy from organometallic compounds in hydrogen atmosphere at the initial stages of growth the layer orientation is given by the direction of Si(111) plane of nanocanals in NP-Si(113) and the growth rate of GaN layer in (11-22) and (0001) planes direction is comparable.
10.18721/JPM.161.234
548.527
semi-polar GaN(11-22)
nano-patterned Si(113) substrate
epitaxy from the metal-organic chemical vapor deposition
https://physmath.spbstu.ru/article/2023.64.34/
CNF
RUS
229-235
St. Petersburg Electrotechnical University "LETI"
Punegova
Kseniya
punegova.k@mail.ru
St. Petersburg, Russian Federation
Nalimova
Svetlana
sskarpova@list.ru
St. Petersburg Electrotechnical University "LETI"
Arkhipenko
Viktoriya
va_arkhipenko@mail.ru
St. Petersburg, Russian Federation
0000-0001-9626-7612
Ioffe Institute
Ryabko
Andrey
St. Petersburg, Russian Federation
0000-0002-3469-5897
Alferov University
Kondratev
Valeriy
kvm_96@mail.ru
St. Petersburg, Russian Federation
Kabardino–Balkarian State University
Shomakhov
Zamir
shozamir@yandex.ru
Nalchik, Russian Federation
Kabardino-Balkarian State University named after H.M. Berbekov
Guketlov
Aslan
guketlovaslan3@gmail.com
Nalchik, Russian Federation
Zinc stannate nanostructures for low-temperature gas sensors with improved response and performance
Nowadays, the development of approaches to increase the sensitivity and reduce the operating temperature of gas sensors based on metal oxides is the important task. In this paper, these problems are solved by forming zinc stannate nanostructures during hydrothermal treatment of zinc oxide nanowires. The microstructure and chemical composition of the synthesized nanostructures were studied by SEM, EDS and XPS. Sensor responses to isopropyl alcohol vapors (1000 ppm) at 120 °C, 180 °C and 250 °C were measured. It was found that the sensor response values of zinc stannate nanostructures significantly exceed the responses of zinc oxide. Moreover, zinc stannate demonstrates the response of 6.3 at 120 °C. Thus, the developed structures can be used to create sensors of reducing gases with low operating temperatures.
10.18721/JPM.161.235
621.382
nanostructures
sensitivity
hydrothermal treatment
https://physmath.spbstu.ru/article/2023.64.35/
CNF
RUS
236-240
Stetsyura
Svetlana
stetsyurasv@mail.ru
Kharitonova
Polina
haritonovapg@gmail.com
Magnetic properties of heterophase film coatings based on a solid solution of cadmium sulfide and iron
In this work, we measured and analyzed the magnetic susceptibility and the isotherms of magnetization of a semimagnetic material based on CdS: Fe with nanosized inclusions of FeS and Fe2O3 phases. These measurements made it possible to divide the ferromagnetic and paramagnetic phases. Measurements of magnetic force microscopy showed manifestations of magnetic properties mainly at the boundaries of CdS grains, which is explained by the predominance of the mechanism of diffusion of iron atoms along the boundaries of crystallites. The displacement of Cd atoms with the formation of FeS or the oxidation of Fe to the state of maghemite occurs at the boundaries of these crystallites.
10.18721/JPM.161.236
539.23, 537.62
semimagnetic material
heterogeneous material
magnetic force microscopy
magnetization isotherms
magnetic susceptibility
magnetic hysteresis
https://physmath.spbstu.ru/article/2023.64.36/
CNF
RUS
241-246
Vakulov
Zakhar
zakhar.vakulov@gmail.com
Dzyuba
Dmitry
dmdzyuba@sfedu.ru
Shihovcov
Ivan
shihovcov@sfedu.ru
Southern Federal University
Parshina
Natalia
nparshina@sfedu.ru
Rostov-on-Don, Russian Federation
Tominov
Roman
tominov@sfedu.ru
Southern Federal University
Klimin
Viktor
kliminvs@sfedu.ru
Rostov-on-Don, Russian Federation
Smirnov
Vladimir
vasmirnov@sfedu.ru
Southern Federal University
Ageev
Oleg
ageev@sfedu.ru
Taganrog, Russian Federation
BaTiO3 nanocrystalline thin films: synthesis, plasma treatment, and memristive effect
Here, experimental studies on barium titanate nanocrystalline thin films fabricated by pulsed laser deposition and the influence of the oxygen pressure on the morphological parameters are presented. The average grain size changes from (20.1±1.8) nm to (88.2±7.9) nm with increasing oxygen pressure from 1×10‒5 Torr to 1×10‒2 Torr. The effect of plasma treatment on the parameters of BaTiO3 nanocrystalline thin films was studied. It was found that the formation of whisker-like structures is preferred for BaTiO3 when the power of inductively coupled and capacitive plasma sources increases. The results can be applied to the design and development of technological processes for promising lead-free energy converters, eco-friendly energy devices and memristive structures developed based on pulsed laser deposition.
10.18721/JPM.161.237
539.234
barium titanate
thin films
pulsed laser deposition
plasma treatment
memristive effect
https://physmath.spbstu.ru/article/2023.64.37/
CNF
RUS
247-252
Tominov
Roman
tominov@sfedu.ru
Shihovcov
Ivan
shihovcov@sfedu.ru
Southern Federal University
Khakhulin
Daniil
dhahulin@sfedu.ru
Taganrog, Russian Federation
Vakulov
Zakhar
zakhar.vakulov@gmail.com
Smirnov
Vladimir
vasmirnov@sfedu.ru
Multilevel resistive switching in forming-free nanocrystalline ZnO films for neuromorphic applications
We have experimentally studied the multilevel resistive switching in forming-free nanocrystalline ZnO films. It was shown that potentiation and depression at 0.5 V and ‒0.5 V for 3000 cycles led to the film resistance increasing by 3 orders of magnitude. In addition, it was shown that ZnO films successfully mimic biological memory through increased pulse number stimulation. Fixing the amplitude of the training pulses makes it possible to achieve different resistive states such as synaptic weight levels of the biological brain. The obtained results can be used for ReRAM elements of neuromorphic artificial intelligence systems fabrication based on forming-free nanocrystalline ZnO films.
10.18721/JPM.161.238
621.38-022.532
neuromorphic systems
memristor; ReRAM
multilevel resistive switching
forming-free nanocrystalline ZnO
pulsed laser deposition
https://physmath.spbstu.ru/article/2023.64.38/
CNF
RUS
253-259
Bashkir State Medical University
Rakhimov
Artur
ragar83@mail.ru
Ufa, Russian Federation
Mavlutov Institute of Mechanics UFRC RAS
Valiev A.A.
Azat
azatphysic@mail.ru
Ufa, Russian Federation
Mavlyutov Institute of Mechanics, Ufa Federal Research Centre of the RAS
Akhmetov
Alfir
alfir@anrb.ru
Ufa, Russian Federation
Bashkir State Medical University
Danilko
Ksenia
kse-danilko@yandex.ru
Ufa, Russian Federation
Development of microfluidic devices for experimental study of cell migration activity, use of numerical methods
Assessment of the migration potential of tumor cells, as well as cells of the immune system in tumor foci, is relevant due to the need for highly informative and fast methods for diagnosing and predicting cancer. To study the active movement of cells, a two-level migration cell was developed and fabricated by soft photolithography. It consists of fluid supply channels and two chambers (“gradient” and “storage”) 50 µm high, which communicate through “migration” channels 10 µm high. A chemoattractant and nutrient medium were supplied to the “gradient” chamber of the cell. Due to diffusion, mass transfer occurs between the two laminar flows of the chemoattractant and the nutrient medium, a concentration gradient of the chemoattractant is formed perpendicular to the direction of flow, stimulating the movement of cells located in the “storage” chamber. The features of the model are smooth transitions at the junctions of channels and in transition zones; sealed containers of the “storage” chamber, degassing of injected liquids. For cell adhesion, the inner walls of the cell were covered with collagen. With the help of numerical simulation in the Comsol Multiphysics program, taking diffusion into account, the distribution of the velocity field in the supply channels and in the “gradient” chamber was found. The velocities in the center of the channels practically coincide with those obtained during the flow of luminescent latex spherules: 180 µm/s in the supply channels and 150 µm/s in the “gradient chamber”. The development of microfluidic devices for monitoring cell migration is an important step towards improving the diagnosis and therapy of cancer.
10.18721/JPM.161.239
532.5, 576.5
cancer cell
microfluidics
migration cell
microchannel
soft photolithography
https://physmath.spbstu.ru/article/2023.64.39/
CNF
RUS
260-269
Kazan (Volga region) Federal University
Elenev
Alexander
a.elenev6345@gmail.com
Kazan, Russian Federation
Kazan (Volga region) Federal University
Demin
Sergey
serge_demin@mail.ru
Kazan, Russian Federation
Kazan (Volga region) Federal University
Yunusov
Valentin
valentin.yunusov@gmail.com
Kazan, Russian Federation
Quasi-particle description of correlations and statistical memory effects in the discrete time dynamics of complex non-physical systems
We present the main provisions and ideas of the quasi-particle description concept of the discrete time dynamics of complex non-physical systems, developed within the frameworks of Memory Functions Formalism. The initial signal generated by a complex system is represented as time variations of the quasiparticle movement coordinate in one-dimensional space. The novelty of the proposed concept lies in the derivation of analytical expressions for chains of finite-difference equations relating time correlation functions and statistical memory functions for a sequence of derivatives of the temporal dynamics of the quasiparticle coordinates: velocity, acceleration, energy, energy flow. The proposed concept was tested for the study of correlations and statistical memory effects, as well as relaxation patterns, in the dynamics of neuromagnetic responses of healthy subjects and a patient with photosensitive epilepsy in response to a red-blue flickering stimulus. The results obtained allow establishing informationally significant sensors and the corresponding zones of localization of the human cerebral cortex for the analysis and diagnosis of photosensitive epilepsy.
10.18721/JPM.161.240
536-12
complex systems
time series analysis
Memory Functions Formalism
correlations
statistical memory effects
quasi-particle description
neuromagnetic responses
photosensitive epilepsy
https://physmath.spbstu.ru/article/2023.64.40/
CNF
RUS
270-276
Zaitceva
Anna
anna@da-24.ru
Institute for Analytical Instrumentation RAS
Guzenko
Maria
maria51m@mail.ru
St. Petersburg, Russian Federation
intelligent sensor system for ranking the ionic composition of breast milk
The intelligent sensor system conducts a qualitative and highly accurate medical ranking of breast milk and dairy products based on a personalized approach. It can make the decision-making procedure for medical workers as objective as possible and ensure the implementation of high-quality, effective and safe hardware solutions in the field of artificial intelligence and personalized medicine into medical practice.
10.18721/JPM.161.241
543.2, 681.2-5, 664.3.032.9
sensory system
breast milk
digital images
biological environment
https://physmath.spbstu.ru/article/2023.64.41/
CNF
RUS
277-281
Institute for Analytical Instrumentation RAS
Cherednikova
Arina
arina4erednikova@yandex.ru
St. Petersburg, Russian Federation
Institute for Analytical Instrumentation
Kuzmin
Alexey
agqz55@rambler.ru
Institute for Analytical Instrumentation RAS
Guzenko
Maria
maria51m@mail.ru
St. Petersburg, Russian Federation
Institute for Analytical Instrumentation
Titov
Yuriy
titov.uriy@gmail.com
Zaitceva
Anna
anna@da-24.ru
Study of exhaled air composition during recovery after respiratory disease by mass spectrometric analysis
This article considers the possibility of monitoring recovery after respiratory diseases by mass spectrometric methods. Two groups of test subjects took part in the study: 18 individuals who had had a respiratory viral infection and 31 healthy volunteers in good physical condition. A noninvasive mass spectrometric method of controlling the gas composition of exhaled air was used in the study. The results of the experiment demonstrate the effectiveness of the technique: the differences detected in the mass spectra of healthy people and subjects who had a respiratory viral infection allow the technique to be used to search for pathology markers.
10.18721/JPM.161.242
543.51
mass spectrometry
gas composition analysis
exhaled air
acute respiratory viral infection
principal component method
https://physmath.spbstu.ru/article/2023.64.42/
CNF
RUS
282-286
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Derbin
Alexander
derbin_av@pnpi.nrcki.ru
Gatchina, Russian Federation
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Drachnev
Ilia
DRACHNEV_iS@pnpi.nrcki.ru
Gatchina, Russian Federation
Institute for Nuclear Research RAS
Gavrilyuk
Yuri
gangapsh@list.ru
Moscow, Russian Federation
Institute for Nuclear Research RAS
Gangapshev
Albert
gangapsh@list1.ru
Moscow, Russian Federation
Institute for Nuclear Research RAS
Kazalov
Vladimir
vvk1982@mail.ru
Moscow, Russian Federation
Institute for Nuclear Research RAS
Kuzminov
Valery
bno_vvk@mail.ru
Moscow, Russian Federation
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Mikulich
Maxim
Gatchina, Russian Federation
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Muratova
Valentina
muratova_vn@pnpi.nrcki.ru
Gatchina, Russian Federation
Institute for Nuclear Research RAS
Tekueva
Djamilia
gangap@list2.ru
Gatchina, Russian Federation
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Unzhakov
Evgeniy
unzhakov_ev@pnpi.nrcki.ru
Gatchina, Russian Federation
Institute for Nuclear Research RAS
Yakimenko
Sergey
yakimenko@inr.ru
Moscow, Russian Federation
New limit on axion-electron coupling obtained from searching for resonant absorption of solar axions by 83Kr nuclei
A search for resonant excitation of first nuclear level of 83Kr nucleus at 9.4 keV by solar axion fluxes that depend on axion-electron coupling constant gAe have been performed. The search was carried out via gaseous proportional counter that was installed in a low- background experimental setup located at underground facility of Baksan Neutrino Observatory (INR RAS). The measurement yielded new limit on axion-electron coupling constant and axion mass |gAe mA| ≤ 1.33∙10-9 eV.
10.18721/JPM.161.243
539.16
solar axion
dark matter
https://physmath.spbstu.ru/article/2023.64.43/
CNF
RUS
287-294
National Research Centre “Kurchatov Institute”
Bazlov
Nikolay
nikolay.bazlov@gmail.com
Gatchina, Russian Federation
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Derbin
Alexander
derbin_av@pnpi.nrcki.ru
Gatchina, Russian Federation
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Drachnev
Ilia
DRACHNEV_iS@pnpi.nrcki.ru
Gatchina, Russian Federation
National Research Centre “Kurchatov Institute”
Kotina
Irina
kotina_im@pnpi.nrcki.ru
Gatchina, Russian Federation
Ioffe Physical Technical Institute of the Russian Academy of Sciences
Kon’kov
Oleg
oleg-l705@yandex.ru
194021, Politekchnicheskay st., Saint-Petersburg, 26
National Research Centre “Kurchatov Institute”
Lomskaya
Irina
lomskaya_is@pnpi.nrcki.ru
Gatchina, Russian Federation
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Mikulich
Maxim
Gatchina, Russian Federation
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Muratova
Valentina
muratova_vn@pnpi.nrcki.ru
Gatchina, Russian Federation
National Research Centre “Kurchatov Institute”
Semenov
Dmitriy
semenov_da@pnpi.nrcki.ru
Gatchina, Russian Federation
National Research Centre “Kurchatov Institute”
Trushin
Maxim
trushin_mv@pnpi.nrcki.ru
Gatchina, Russian Federation
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Unzhakov
Evgeniy
unzhakov_ev@pnpi.nrcki.ru
Gatchina, Russian Federation
Radiation hardness of silicon semiconductor detectors under irradiation with fission products of 252Cf nuclide
The influence of the prolonged irradiation by fission products of 252Cf radionuclide on the operational parameters of silicon-lithium Si(Li) p-i-n detectors, Si surface barrier detectors and Si planar p+n detector was investigated. The obtained results revealed a linear shift of the fission fragment peaks positions towards the lower energies with increase of the irradiation dose for all investigated detectors. The rate of the peaks shift was found to depend strongly on the detector type and the strength of the electric field in the detector’s active region, but not on the temperature of irradiation (room or liquid nitrogen temperature). Based on the obtained results, the possibility of integration of the investigated types of Si semiconductor detectors in a radionuclide neutron calibration source is considered.
10.18721/JPM.161.244
53.082.79
silicon detectors
fission fragments
pulse height defect
radiation hardness
https://physmath.spbstu.ru/article/2023.64.44/
CNF
RUS
295-301
Ioffe Institute
Fadeeva
Nadezda
fadeeva.nadezda@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Eremin
Vladimir
vladimir.eremin@cern.ch
St. Petersburg, Russian Federation
Ioffe Institute
Verbitskaya
Elena
elena.verbitskaia@cern.ch
St. Petersburg, Russian Federation
Ioffe Institute
Eremin
Igor
ereminpti@hotmail.com
St. Petersburg, Russian Federation
St. Petersburg Electrotechnical University "LETI"
Vidimina
Yulia
uvidimina@gmail.com
St. Petersburg, Russian Federation
Kinetics of current outflow from electron-hole plasma generated in silicon detectors by relativistic heavy ions
The investigation is focused on the processes associated with the detection of heavy ions of hundreds GeV energy in silicon p+-n-n+ detectors. In the study, the 1D simulation of the electric field and free carrier density evolution in the 238U ion track during the first nanosecond was carried out, which demonstrated the initial appearance of narrow high electric field regions adjacent to the contacts and a strong reduction of the electric field in between. The kinetics of the electron-hole plasma dispersal was assigned to a track polarization within 100 ps followed by a delayed track destruction up to its disappearance. It was shown that the process at the p+ contact was governed by the drift of electrons as a merged fraction of free carriers, which controls the hole current flowing between the track and the p+ contact. The density of the current initiated by the track polarization was evaluated as 8·103 A/cm2.
10.18721/JPM.161.245
539,1,074
silicon radiation detector
electron-hole plasma
electric field
https://physmath.spbstu.ru/article/2023.64.45/
CNF
RUS
302-307
Khlopin Radium Institute
Koltsov
Vladimir
vladimir-koltsov@yandex.ru
St. Petersburg, Russian Federation
Nuclear isomers as a tool for studying the influence of zero-point fluctuations of an electromagnetic field on the probability of spontaneous electromagnetic transitions
A review of works on the influence of zero-point fluctuations of the electromagnetic (EM) field (ZPFs) on EM transitions in atomic nuclei inside metals is presented. In a metal, as well as in a resonator of extremely small dimensions, ZPFs are suppressed in the region of low frequencies ω, for which the reflection of EM waves from the metal surface is still significant (ħω is less than ~ 1 keV). Based on the concept of the stimulation of spontaneous EM transitions of energy ħω0 by resonant ZPFs of frequency ω0, one could expect suppression of transitions of energy up to ~ 1 keV for excited nuclei in a metal matrix. In experiments with nuclear isomers, such an effect was indeed found for conversion transitions of 76, 910, and 2173 eV energy, which cannot be explained only by the deformation of the electron shells of isomeric atoms or by the scattering of conversion electrons by matrix atoms. Qualitatively, the effect corresponds to the suppression of conversion transitions with a decrease in the ZPFs energy density in metals at the transition frequencies.
10.18721/JPM.161.246
539.17
nuclear isomers
probability of nuclear transitions
zero-point fluctuations of the electromagnetic field
https://physmath.spbstu.ru/article/2023.64.46/
CNF
RUS
308-314
Petersburg Nuclear Physics Institute – NRC Kurchatov Institute
Burmasov
Nazar
nazar.burmasov@cern.ch
Gatchina, Russian Federation
Prospects of light-by-light scattering measurements and axion-like particle searches at the LHC
Ultra-peripheral collisions of heavy ions (UPCs) provide a clean environment for studies of two-photon interactions due to large impact parameters between incoming nuclei at which strong interactions are highly suppressed. In particular, UPCs were used by the ATLAS and CMS collaborations at the LHC to establish the evidence of the light-by-light scattering process (LbyL). In addition, there has been a growing interest to studies of physics beyond the Standard Model (BSM) in photon-induced processes, specifically, to studies of production of axion-like particles (ALPs) that appear in a number of extensions of the Standard Model. The ATLAS and CMS managed to measure differential cross sections of LbyL process and improve limits on ALP-γ coupling constant in a range of masses between 5 and 100 GeV, while the region below 5 GeV can be addressed in the future ALICE 3 experiment, the proposed next-generation experiment for LHC Run 5 and beyond. In this work, a review of recent results on LbyL and searches for ALPs at the Large Hadron Collider will be given, and future prospects for the measurements will be discussed.
10.18721/JPM.161.247
539.1
heavy-ion collisions
new physics
two-photon interactions
https://physmath.spbstu.ru/article/2023.64.47/
CNF
RUS
315-321
Ioffe Institute
Rukolaine
Sergey
rukol@ammp.ioffe.ru
St. Petersburg, Russian Federation
Effects observed in the ballistic-conductive model of heat conduction
In this paper, we study the behavior of solutions to the initial value problem in the framework of the ballistic-conductive (BC) model of heat conduction. As a result of the study, the effect of partial “immobilization” of thermal energy has been found. This effect is unphysical and is a defect of the BC model.
10.18721/JPM.161.248
517.958
non-Fourier heat conduction
hyperbolic heat conduction
the ballistic-conductive model
https://physmath.spbstu.ru/article/2023.64.48/
CNF
RUS
322-329
Ioffe Institute
Dymnikova
Irina
igd.ammp@mail.ioffe.ru
St. Petersburg, Russian Federation
Galaktionov
E.V.
galakt.ammp@mail.ioffe.ru
Electromagnetic fields of regular rotating electrically charged objects in nonlinear electrodynamics minimally coupled to gravity
We present a brief overview of the main properties of electromagnetic fields of regular rotating electrically charged objects in non-linear electrodynamics minimally coupled to gravity (NED-GR). The basic features of electromagnetic fields follow from the analysis of the regular solutions to the NED-GR dynamic equations. For NED-GR regular objects the Lagrangian inevitably branches at a single minimum of the field invariant F. The study of the asymptotic of the solutions of the field equations at r → 0 reveals the fundamental features of the electromagnetic dynamics on the de Sitter vacuum disk (r = 0) in the deep interiors of rotating NED-GR objects. The disk has the properties of a perfect conductor and an ideal diamagnetic, zero magnetic induction, and is confined by a ring with a superconducting current, which replaces the Kerr ring singularity, serves as a non-dissipative source of electromagnetic fields of NED-GR regular objects and provides the origin of their intrinsic magnetic momenta.
10.18721/JPM.161.249
53:51
non-linear electrodynamics
Lagrangian
asymptotic of the solutions
https://physmath.spbstu.ru/article/2023.64.49/
CNF
RUS
330-336
Mavlyutov Institute of Mechanics, Ufa Federal Research Centre of the RAS
Bolotnova
Raisa
bolotnova@anrb.ru
Ufa, Russian Federation
Mavlyutov Institute of Mechanics, Ufa Federal Research Centre of the RAS
Korobchinskaya
Valeria
buzina_lera@mail.ru
Ufa, Russian Federation
Formation of supersonic steam-water jets accompanied by generation of acoustic pulsations
The features of supersonic steam-water jets formation under outflow through a thin nozzle from a high-pressure chamber are considered. The modes of emerging vibration processes are investigated, depending on variation of initial saturation states determined by pressure and temperature. The proposed system of model equations for steam-water mixture in three-dimensional formulation, in two-temperature, single-pressure, and single-velocity approximations, takes into account the interphase heat exchange, evaporation and condensation phenomena. The numerical implementation of this problem is carried out by the authors developed solver in the OpenFOAM package. The process of supersonic jet development with the formation of Mach disk is studied and the causes of acoustic pressure pulsations are investigated. The analysis of influence of initial saturation states of vapor-water fluid located in a high-pressure chamber on intensity and frequency of acoustic vibrations is given. To validate the numerical method using the OpenFOAM package, the obtained numerical solution is compared with an experimental picture of a supersonic nitrogen jet flowing through a cylindrical nozzle from a high-pressure reservoir.
10.18721/JPM.161.250
532.529.5
The research work was supported by the state budget funds for State Assignment 0246-2019-0052.
https://physmath.spbstu.ru/article/2023.64.50/
CNF
RUS
337-342
Mavlyutov Institute of Mechanics, Ufa Federal Research Centre of the RAS
Bolotnova
Raisa
bolotnova@anrb.ru
Ufa, Russian Federation
Mavlyutov Institute of Mechanics, Ufa Federal Research Centre of the RAS
Gainullina
Elina
elina.gef@yandex.ru
Ufa, Russian Federation
Analysis of the influence of aqueous foam rheological properties on the structure of wave impulse
The dynamics of a low-intensity plane shock wave during its propagation into a foam layer is numerically investigated for experimental data conditions performed in a horizontal shock tube. To describe the behavior of aqueous foam under weak impact, the model of aqueous foam developed by the authors was used, describing it as an elastic-viscoplastic system taking into account elastic properties in accordance with Hooke’s law, and describes viscoplastic behavior by the Herschel–Bulkley conditions. The model was numerically implemented by creating the new solver in the OpenFOAM software. The analysis of the wave flow dynamics during the propagation of a weak air shock wave into the foam layer is carried out. The features of the elastic precursor formation are shown. Based on the results of calculations, the influence of the initial liquid volume fraction on the elastic-viscoplastic properties of the aqueous foam, on which the structure of the shock wave profile, its intensity and propagation velocity depend, is estimated. The reliability of the obtained calculations is confirmed by satisfactory agreement of numerical solutions with experimental data.
10.18721/JPM.161.251
532.529:5
aqueous foam
weak shock wave
elastic-viscous-plastic properties
numerical modeling
OpenFOAM software
https://physmath.spbstu.ru/article/2023.64.51/
CNF
RUS
343-348
Bashkir State University
Valiullina
Vilena
valiullina.vilena@mail.ru
Ufa, Russian Federation
Bashkir State University
Musin
Airat
mus-airat@yandex.ru
Ufa, Russian Federation
Bashkir State University
Zamula
Yuriy
yuriyzamula@gmail.com
Ufa, Russian Federation
Bashkir State University
Kovaleva
Liana
liana-kovaleva@yandex.ru
Ufa, Russian Federation
Determination of correlation dependences of emulsion viscosity on the concentration of water droplets under non-isothermal conditions
There are several factors that affect the rheological properties of an emulsion. Because heavier oils are highly viscous, determining this property plays a special role in the oil industry. Viscous oils can cause many problems throughout the system and can also cause difficulties in pumping and transportation. In this paper, the experimental values were approximated by an exponential viscosity-temperature relationship in which the empirical coefficients are a function of concentration. At low concentrations, the pre-exponential multiplier is described by the Taylor formula; at concentrations greater than 2.5%, the curve is described by a power function. The dependence of the temperature coefficient of viscosity on concentration is described by a linear function.
10.18721/JPM.161.252
532.1
disperse system
viscosity
emulsion
correlation dependences
https://physmath.spbstu.ru/article/2023.64.52/
CNF
RUS
349-355
Peter the Great St. Petersburg Polytechnic University
Ivanova
Yana
radfn94@mail.ru
St. Petersburg, Russian Federation
0000-0002-5719-5959
Peter the Great St. Petersburg Polytechnic University
Tikhomolova
Ludmila
St. Petersburg, Russian Federation
Peter the Great St. Petersburg Polytechnic University
Yuhnev
Andrey
a.yukhnev@mail.ru
E-5484-2014
56020596900
Peter the Great St. Petersburg Polytechnic University
Smirnov
Evgeny
aero@phmf.spbstu.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
0000-0003-4923-605X
Pavlov First St. Petersburg State Medical University
Vrabiy
Andrey
St. Petersburg, Russian Federation
Pavlov First St. Petersburg State Medical University
Suprunovich
Andrey
doctoras@mail.ru
St. Petersburg, Russian Federation
0000-0003-3051-6334
Pavlov First St. Petersburg State Medical University
Morozov
Alexey
St. Petersburg, Russian Federation
0000-0001-9093-8024
Pavlov First St. Petersburg State Medical University
Khubulava
Gennady
St. Petersburg, Russian Federation
Dynamics of branching blood flows at artery-bypass junctions with and without tissue overgrowth: patient-specific CFD simulation
The article presents the results of numerical study of hemodynamics in proximal femoral-popliteal anastomoses of real patients in case of neointimal hyperplasia. Geometric models of anastomoses were based on the clinical data obtained by computer tomography. The neointimal hyperplasia causes changes in the blood flow structure and in stagnant zones after the suture area. Due to the cross-section narrowing, the time-averaged wall shear stresses (TAWSS) in this region increase and the oscillatory shear index (OSI) decreases, and the combined index known as relative residence time (RRT) increases as well. Low values of TAWSS and high values of OSI and RRT are observed in the stagnant zone. High RRT values indicate areas with a high risk of neointimal hyperplasia.
10.18721/JPM.161.253
532.5
patient-specific simulation
femoral-popliteal anastomoses
neointimal hyperplasia
wall shear stress
oscillatory shear index
relative residence time
https://physmath.spbstu.ru/article/2023.64.53/
CNF
RUS
356-361
Mavlyutov Institute of Mechanics, Ufa Federal Research Centre of the RAS
Rafikova
Guzal
rafikova_guzal@mail.ru
Ufa, Russian Federation
Formation of carbon dioxide hydrate in a closed volume of a water-saturated porous medium
In the present work, a mathematical model is constructed for the formation of carbon dioxide hydrate in a closed volume of a porous medium saturated with water and carbon dioxide. The thermobaric parameters of the system correspond to the conditions for the existence of gaseous carbon dioxide and CO2 hydrate at positive temperatures. The system of basic equations includes mass conservation equations for phase components, energy and state equations. An analysis was made of the influence of the initial parameters of the system (water saturation, pressure, temperature, porosity) on the intensity of hydrate formation. A decision map has been constructed illustrating the possible modes of hydrate formation, in particular, when water completely or partially passes into the composition of the gas hydrate.
10.18721/JPM.161.254
532.546:536.421
formation of carbon dioxide hydrate
porous medium
water saturation
https://physmath.spbstu.ru/article/2023.64.54/
CNF
RUS
362-369
Ioffe Institute
Bykov
Andrey
byk@astro.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Uvarov
Yuri
uv@astro.ioffe.ru
St. Petersburg, Russian Federation
Asymmetry study of the mixed-morphology supernova remnant G 18.95-1.1
Radio and X-ray maps of supernova remnants (SNRs) in many cases revealed an asymmetric global structure. This may reflect the inhomogeneity of the circumstellar/ambient matter, anisotropic energy release or both. Given a growing sample of the observed SNRs some techniques to characterize the global asymmetry are needed to identify old SNRs in sky surveys among other observed extended structures of low surface brightness. We discuss here the applications of modified power-ratio technique to quantify the global asymmetry of the mixed-morphology SNR G 18.95-1.1 using its recent mapping with SRG and compare results with the well-studied SNRs IC 443 and Cas A.
10.18721/JPM.161.255
52
supernova remnants
SNR
power-ratio method
https://physmath.spbstu.ru/article/2023.64.55/
CNF
RUS
370-376
Ioffe Institute
Tanashkin
Artyom
artyom.tanashkin@gmail.com
St. Petersburg, Russian Federation
Ioffe Institute
Karpova
Anna
karpann@astro.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Shibanov
Yury
shib@astro.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Potekhin
Alexander
palex@astro.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Zyuzin
Dmitry
da.zyuzin@gmail.com
St. Petersburg, Russian Federation
Middle-aged gamma-ray pulsar J0554+3107 in X-rays
We present some results of X-ray observations of the middle-aged γ-ray pulsar J0554+3107 with XMM-Newton. For the first time, we detected X-ray pulsations with the J0554+3107 spin period from the presumed X-ray counterpart, thus confirming its pulsar nature. The pulsed fraction in the 0.2–2 keV band is 25±6%. The pulsar spectrum can be fitted by the model consisting of thermal and non-thermal components. To describe the former, we created and applied hydrogen atmosphere models for neutron stars with dipole magnetic fields. In addition, an absorption feature at 0.34 keV is required to fit the spectrum. The spectral analysis implies that J0554+3107 has the effective temperature of ~47±2 eV. The analysis also indicates that J0554+3107 may be a rather heavy neutron star with the mass of ~1.9±0.2 M⊙. Implementing the relation between the interstellar absorption and the distance in the pulsar direction, we obtained the distance to the pulsar to be about 2 kpc. Implications of the results for cooling scenarios of neutron stars and the equation of state of supra-dense matter in their cores are briefly discussed.
10.18721/JPM.161.256
524.354.6
neutron stars
pulsars
neutron star cooling
supra-dense matter
https://physmath.spbstu.ru/article/2023.64.56/
CNF
RUS
377-382
0000-0001-8649-4387
Irkutsk State University
Lukyantsev
Dmitriy
Irkutsk, Russian Federation
0000-0002-7902-4448
Irkutsk State University
Afanasiev
Nikolay
Irkutsk, Russian Federation
Irkutsk State University
Tanaev
Andrey
tanaev.ab@yandex.ru
Irkutsk, Russian Federation
Mathematical modeling of effects of plasma and gravitational inhomogeneities in the structure of electromagnetic signals
The three-dimensional algorithm of calculation of the trajectory characteristics of electromagnetic signals in a random-inhomogeneous space plasma placed in the gravity field of difficult configuration has been suggested. The influence of the gravity on the signal propagation has been taken into account by the use of efficient index of refraction. The inhomogeneities of plasma have been defined by the model of spatial correlation function of fluctuations of index of refraction. Results of mathematical modeling of lensing of electromagnetic signals in the gravity field from several space objects have been provided. It is shown that, a significantly different spatial structure of ray field can occur in picture plane of the observer depending on the properties of the gravitational field and parameters of random plasma inhomogeneities.
10.18721/JPM.161.257
537.867
mathematical modeling
lensing effect
geometrical optics approximation
gravitational field
https://physmath.spbstu.ru/article/2023.64.57/
CNF
RUS
383-388
0000-0002-9699-8420
Institute of Solar-Terrestrial Physics of Siberian Branch of RAS
Chudaev
Stanislav
Irkutsk, Russian Federation
0000-0002-7902-4448
Irkutsk State University
Afanasiev
Nikolay
Irkutsk, Russian Federation
0000-0001-8649-4387
Irkutsk State University
Lukyantsev
Dmitriy
Irkutsk, Russian Federation
Diagnostics of CME cavity using data of multiwave measurements of behind-the-limb solar radio bursts
Mathematical modeling of the behind-the-limb radio bursts propagation characteristics at the second harmonic of the local plasma frequency of the solar corona was performed for analytical models of the electron density of the circumsolar plasma and CMEs. The features of the bursts trajectories are studied depending on the parameters of the CMEs and the initial coordinates of solar radio sources. The conditions for the strong effect of CME on radio bursts are determined. The possibility of determining the CME cavity’s parameters from the data of multiwave measurements of the group delays of behind-the-limb radio bursts is shown.
10.18721/JPM.161.258
537.867
mathematical modeling
geometrical optics approximation
behind-limb source
near-Sun plasma
https://physmath.spbstu.ru/article/2023.64.58/
CNF
RUS
389-394
0000-0001-8057-4722
Novosibirsk State University
Ivanova
Anna
annaiv.86@mail.ru
Novosibirsk, Russian Federation
TAIGA Collaboration*
Technique for reconstructing the parameters of EAS and primary cosmic rays based on experimental data of the Tunka-Grande scintillation array
The Tunka-Grande scintillation array is a part of a single TAIGA experimental complex located in the Tunka Valley, 50 km from the Lake Baikal. It consists of 19 observation stations deployed on an area of about 0.5 km2. The main aim of the Tunka-Grande facility is a detailed study of the energy spectrum and mass composition of cosmic rays in the energy range from 10 PeV to 1 EeV by detecting the charged and muon component of EAS. The article presents a method for reconstructing the parameters of the EAS and primary cosmic rays, the cosmic rays energy spectrum based on 4 measurement seasons, and compares the results obtained with the data of the Tunka-133 and TAIGA-HiSCORE Cherenkov arrays.
*TAIGA Collaboration
Astapov I.I., Bezyazeekov P.A., Bonvech E.A., Borodin A.N., Budnev N.M., Bulan A.V., Chernov D.V., Chiavassa A., Dyachok A.N., Gafarov A.R., Garmash A.Yu., Grenebyuk V.M., Gres E.O., Gres O.A., Gres T.I., Grinyuk A.A., Grishin O.G., Ivanova A.D., Ilushin M.A., Kalmykov N.N., Kindin V.V., Kiryukhin S.N., Kokoulin R.P., Kompaniets K.G., Korosteleva E.E., Kozhin V.A., Kravchenko E.A., Kryukov A.P., Kuzmichev L.A., Lagutin A.A., Lavrova M.V., Lemeshev Yu.E., Lubsandorzhiev B.K., Lubsandorzhiev N.B., Malakhov S.D., Mirgazov R.R., Monkhoev R.D., Okuneva E.A., Osipova E.A., Pakhorukov A.L., Pankov L.V., Pan A., Panov A., Petrukhin A.A., Podgrudkov D.A., Popova E.G., Postnikov E.G., Prosin V.V., Ptuskin V.S., Pushnin A.A., Raikin R.I., Razumov A.Yu., Rubtsov G.I., Ryabov E.V., Samoliga V.S., Satyshev I., Sidorenkov A.Yu., Silaev A.A., Silaev A.A., Tarashchansky B.A., Tkachev L.G., Tanaev A.B., Ternovoy M.Yu., Ushakov N.A., Volchugov P.A., Volkov N.V., Voronin D.M., Zagorodnikov A.V., Zhurov D.P., Yashin I.I., Vaidyanathan A.
10.18721/JPM.161.259
524.1
Primary Cosmic Rays
EAS
scintillation detectors
Tunka-Grande scintillation array
https://physmath.spbstu.ru/article/2023.64.59/
CNF
RUS
395-402
Volgograd State University
Khrapov
Sergey
khrapov@volsu.ru
Volgograd, Russian Federation
Volgograd State University
Khoperskov
Alexander
khoperskov@volsu.ru
Volgograd, Russian Federation
0000-0001-7871-5805
Sternberg Astronomical Institute
Zaitseva
Natalia
Moscow, Russian Federation
Lomonosov Moscow State University
Zasov
Anatoly
zasov@sai.msu.ru
Moscow, Russian Federation
Volgograd State University
Titov
Alexander
alexandr.titov@volsu.ru
Volgograd, Russian Federation
Formation of spiral dwarf galaxies: observational data and results of numerical simulation
Recent studies show the possibility of the formation of fairly regular and global spiral patterns in dwarf galaxies (dS type). Our sample of observed dwarf objects of this class also includes galaxies with a central stellar bar. The analysis of the observational data provides a small rotation velocity and a small disk component mass for dS galaxies, which is in poor agreement with the spiral structure generation mechanism in isolated dwarfs due to the development of disk gravitational instability. Numerical simulation of the stellar–gaseous disks self-consistent dynamics imposes restrictions on the stellar disk thickness and the maximum gas rotation velocity, at which the gravitational mechanism of spiral formation can still be effective.
10.18721/JPM.161.260
524.7
dwarf galaxies
spiral structure
N-body simulation
https://physmath.spbstu.ru/article/2023.64.60/
CNF
RUS
403-409
Central Astronomical Observatory of the RAS
Martyusheva
Alexandra
alex.mart13@gmail.com
St. Petersburg, Russian Federation
0000-0001-5095-664X
Central Astronomical Observatory of the RAS
Devyatkin
Alexander
St. Petersburg, Russian Federation
0000-0002-1547-3674
Central Astronomical Observatory of the RAS
L'vov
Victor
St. Petersburg, Russian Federation
Gravitational and non-gravitational effects in the orbital motion of asteroid 2022 AE1
Asteroid 2022 AE1 with a diameter of about 70 m, discovered at the very beginning of 2022, approached the Earth on December 31, 2021 at a minimum distance of 0.0664 au. The potential hazard of a collision with the Earth during the next close approach in 2023 was estimated by astronomers at 1 in 1700, which raised widespread public concern. Subsequent observations made it possible to refine the asteroid’s orbit and showed that the collision will be avoided. However, the upcoming close encounters of this asteroid with the Earth and, especially, with Venus, as well as possible approaches with the main belt asteroids, require not to weaken the attention to this object. Gravitational and non-gravitational effects can have a significant impact on its orbit and, as a consequence, lead to a collision with one of the inner planets. In this work, the displacements of asteroid 2022 AE1 under the influence of solar radiation pressure were calculated over several time intervals for various values of the average density of the object. Furthermore, the diurnal and seasonal components of the Yarkovsky effect were calculated for various rotation periods and axial tilt angles of the asteroid. As a result of the simulation, possible orbits of the asteroid were obtained and a probability estimation of the asteroid collision with the Earth was made.
10.18721/JPM.161.261
523.44, 52-17, 521.3
potentially hazardous asteroids
solar radiation pressure
the Yarkovsky effect
https://physmath.spbstu.ru/article/2023.64.61/
ABS
RUS
410-416
Ioffe Institute
Bogdanov
Alexandr
alexander.a.bogdanov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Repman
Georgiy
repman.gast@mail.ru
St. Petersburg, Russian Federation
Ioffe Institute
Tuboltsev
Yury
tuboltsev@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Chichagov
Yury
Chichagov@mail.ioffe.ru
St. Petersburg, Russian Federation
Kholupenko
Evgeniy
eugene@astro.ioffe.ru
Krasil’shchikov
Alexander
kra@astro.ioffe.ru
Development of detector cluster based on silicon photomultipliers for the Cherenkov gamma-ray telescope TAIGA-IACT
A new experimental detector cluster for the TAIGA-IACT telescope has been developed. The cluster contains 28 pixels based on MicroFJ-60035 silicon photomultipliers, whose signal is digitized with an analog memory chip (switched capacitor array) DRS4 at a frequency of up to 5 GHz. The paper describes the device and the operation principles of the detector cluster, reveals the peculiarities encountered in the development process. Dark chamber tests of the cluster with a point source of short pulses of ultraviolet light have allowed us to obtain dependencies of the cluster conversion coefficient and the maximum value of the recorded signal on the overvoltage of the silicon detectors.
10.18721/JPM.161.262
520.2
SiPM
silicon photomultipliers
readout electronics
IACT
https://physmath.spbstu.ru/article/2023.64.62/
UNK
RUS
417-422
Ioffe Institute
Antonov
Andrei
andrey.antonov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Bogdanov
Alexandr
alexander.a.bogdanov@mail.ioffe.ru
St. Petersburg, Russian Federation
Krasil’shchikov
Alexander
kra@astro.ioffe.ru
Design of an optical concentrators array for the camera of a small-size Cherenkov gamma-ray telescope
Quantitative modeling of a system of optical concentrators based on an improved design of Winston hexagonal cones, providing a possibility of using light filters and intended for the registration camera of a small-size Cherenkov gamma-ray telescope, has been performed. The transmission of the cones is calculated, and the intensity distributions of the photon flux in the detector plane are given. Based on the results obtained, an optimal configuration of optical concentrators is proposed with an account for design features of the TAIGA-IACT mount, mirror, and camera, as well as of new detector units. The results obtained for the considered system are compared with the previously published models.
10.18721/JPM.161.263
537.591.15
Cherenkov gamma-ray telescope
Winston cone
numerical simulation
TAIGA-IACT
https://physmath.spbstu.ru/article/2023.64.63/
CNF
RUS
423-428
Krasil’shchikov
Alexander
kra@astro.ioffe.ru
Kholupenko
Evgeniy
eugene@astro.ioffe.ru
Ioffe Institute
Badmaev
Danr
danir1996@mail.ru
St. Petersburg, Russian Federation
Ioffe Institute
Bogdanov
Alexandr
alexander.a.bogdanov@mail.ioffe.ru
St. Petersburg, Russian Federation
Modeling of performance enhancement of the TAIGA-IACT Cherenkov gamma-ray telescope equipped with semiconductor photomultipliers
We present modeling of effective area and count rates of a TAIGA-IACT Cherenkov gamma-ray telescope unit with an upgraded camera based on semiconductor photo detectors (SiPM) OnSemi MicroFJ-60035 and optical filters SL 290‒590 and SL 280-390. In comparison with the current configuration of TAIGA-IACT where classic vacuum photomultipliers are employed, the threshold detection energy of cosmic gamma-quanta by a TAIGA-IACT unit equipped with a SIiPM-based camera and a wide-band optical filter SL 290590 would be reduced down to about 0.4 TeV, and with a narrower filter SL 280-390 down to about 0.7 TeV. Application of semiconductor photo detectors, which are stable against excess illumination, and optical filters of the near-UV band allows one to substantially increase the duty cycle of a Cherenkov gamma-ray telescopes due to the possibility to carry out observations during moonlit nights and at twilight even without a need to substantially increase the trigger threshold. Hence, one may conclude that a TAIGA-IACT unit with an upgraded camera with SiPM detectors will be an efficient instrument for studies of TeV-range emission from space gamma-ray objects.
10.18721/JPM.161.264
520.2
Cherenkov gamma-ray astronomy
silicon photomultipliers
TAIGA observatory
https://physmath.spbstu.ru/article/2023.64.64/
CNF
RUS
429-435
Ioffe Institute
Popov
Alexandr
alexander.popov@mail.ioffe.ru
St. Petersburg, Russian Federation
Barsukov
Dmitry
bars.astro@mail.ioffe.ru
Ioffe Institute
Ivanchik
Alexandre
iav.astro@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Bobashev
Sergey
S.Bobashev@mail.ioffe.ru
St. Petersburg, Russian Federation
Positron production due to interaction of cosmological background photons
The interaction of photons of the cosmological background radiation with producing electron-positron pairs is considered. It is shown that main input in positron production is given by interaction of cosmological gamma-ray background photons with photons of extragalactic background light, although taking into account the interaction of cosmological gamma-ray background photons with cosmological ultraviolet background photons may substantially increase the pair production rate.
10.18721/JPM.161.265
524.8
positron
photon
cosmology radiation background
https://physmath.spbstu.ru/article/2023.64.65/
UNK
RUS
436-441
Ioffe Institute
Kosenko
Daria
kosenkodn@yandex.ru
St. Petersburg, Russian Federation
Ioffe Institute
Balashev
Sergei
s.balashev@gmail.com
St. Petersburg, Russian Federation
HD molecules in the Magellanic Clouds
We present the detection of HD absorption lines in the Magellanic Clouds using FUSE space telescope archival data. We found HD in five (including one known) absorption systems in the Large Magellanic Cloud and three systems in the Small Magellanic Cloud. The measured HD column densities, N(HD), vary from 2∙1013 to 2∙1015 cm-2 for associated H2 column densities, NH2, in the range 3∙1019 to 5∙1020 cm-2. Using Hubble Space Telescope archival data, we also determined the population of CI fine-structure levels and metallicities in these systems. The modelling of obtained observational data for HD, H2 and C I allow us to estimate physical conditions in the interstellar medium of the Magellanic Clouds associated with these absorption systems, namely, the cosmic ray ionization rate, ultraviolet field intensity and number density.
10.18721/JPM.161.266
524.7
galaxies
ISM
molecules
cosmic rays
https://physmath.spbstu.ru/article/2023.64.66/
CNF
RUS
442-448
Ioffe Institute
Kuznetsov
Victor
victor.kuznetsov@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Bakaleinikov
Leonid
bakal.ammp@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Flegontova
Ekaterina
St. Petersburg, Russian Federation
Stability of steady states of plasma diodes with counter-streaming electron and positron flows
Stability of steady states of a planar geometry diode with counter flows of electrons and positrons is studied. The study is related to the elucidation of pulsar RF radiation nature. The equation for the electric field perturbation is derived. Its exact solution is obtained for the case of a homogeneous steady-state field. The study of the dispersion equation obtained has shown that there is a threshold for the inter-electrode gap value, above which steady-state solutions are unstable. The instability threshold turned out to be √2 times higher than the known Pierce threshold.
10.18721/JPM.161.267
52.6, 533.9
plasma diode
electron and positron flows
plasma instability
https://physmath.spbstu.ru/article/2023.64.67/
CNF
RUS
449-453
0000-0002-1699-4498
Central Astronomical Observatory of the RAS
Petrova
Svetlana
St. Petersburg, Russian Federation
0000-0001-5095-664X
Central Astronomical Observatory of the RAS
Devyatkin
Alexander
St. Petersburg, Russian Federation
0000-0002-1547-3674
Central Astronomical Observatory of the RAS
L'vov
Victor
St. Petersburg, Russian Federation
The Earth trojans
Asteroids 2010 TK7 and 2020 XL5 are of particular interest because of their behavior, which is similar to the so-called trojan asteroids. In this paper, computer simulations of the orbital evolution of the asteroids in question were carried out using the EPOS software system. The results of the computer simulations suggest that the Earth trojans were not ordinary trojans in the recent past and will most likely shift to another type of orbit in the distant future.
10.18721/JPM.161.268
523.44; 52-17; 521.3
asteroids
2010 TK7
2020 XL5
https://physmath.spbstu.ru/article/2023.64.68/
CNF
RUS
454-460
Ioffe Institute
Veretenenko
Svetlana
s.veretenenko@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Dmitriev
Pavel
paul.d@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Dergachev
Valentin
v.dergachev@mail.ioffe.ru
St. Petersburg, Russian Federation
Long-term effects of solar activity on cyclone tracks in the North Atlantic
Long-term changes of extratropical cyclone trajectories in the North Atlantic in cold months (October–March) were analyzed, with the data of Mean Sea Level Pressure archives from Climatic Research Unit, UK (1873–2000) and NCEP/DOE AMIP-II Reanalysis (1979–2021) being used. It was revealed that variations of latitudes of storm tracks in the longitudinal range from 60°W to 10°W are characterized by pronounced periodicities of ~80–90 and ~22 years. This indicates their possible relation to the corresponding periodicities in solar/geomagnetic activity and galactic cosmic ray variations, the secular Gleissberg cycle and the magnetic Hale cycle, respectively. At the maximum of the secular cycle, trajectories of North Atlantic cyclones were found to shift a few degrees south, whereas at the minimum and the descending phase they shift to the north. As North Atlantic cyclones influence significantly weather and climate conditions over Europe, oscillations of their tracks associated with solar activity and related phenomena seem to be of great prognostic importance.
10.18721/JPM.161.269
551.590.2
solar activity
cosmic rays
extratropical cyclones
https://physmath.spbstu.ru/article/2023.64.69/
CNF
RUS
461-466
Ioffe Institute
Romansky
Vadim
romanskyvadim@gmail.com
St. Petersburg, Russian Federation
Ioffe Institute
Bykov
Andrey
byk@astro.ioffe.ru
St. Petersburg, Russian Federation
Osipov
Sergey
osm2004@mail.ru
Kinetic modeling of MHD parameters of mildly-relativistic shocks
Mildly-relativistic outflows with shocks of velocities 0.1–0.7c were deduced from multiwavelength observations of powerful fast transient sources. These outflows are associated with merging relativistic objects, relativistic supernovae and fast blue optical transients. Relativistic magneto-hydrodynamic (RMHD) models of these objects rely on the equation of state of the fluid, which is a collisionless plasma with a contribution of non-thermal components. In this paper, we present kinetic simulations of mildly-relativistic shocks with Particle-in-Cell and Monte-Carlo techniques to derive the adiabatic index of plasma in the shock downstream directly from the particle distributions, which can be implemented into the RMHD models.
10.18721/JPM.161.270
524.1
cosmic rays
shock
MHD
Particle-in-Cell
Monte-Carlo
https://physmath.spbstu.ru/article/2023.64.70/
CNF
RUS
467-473
Ioffe Institute
Dranevich
Viacheslav
dranevichva@mail.ru
St. Petersburg, Russian Federation
Ioffe Institute
Dmitriev
Pavel
paul.d@mail.ioffe.ru
St. Petersburg, Russian Federation
Dynamics of quasi-periodic oscillations in the light curve of the GRB 190114C γ-ray burst
Based on the γ-ray Burst Monitor data of the Fermi space observatory, the light curve time structure of the γ-ray burst GRB 190114C in the energy range from 5 keV to 50 MeV was investigated. It was found that the temporal structure of the emission of this γ-ray burst contains quasi-periodic components with periods of 0.768 s, 1.28 s, 2.24 s, and 3.84 s, determined with an accuracy of up to ±0.064 s where the original data time bin is 0.064 s. We also analyzed the evolution of these quasi-period values during the background radiation intensity, which was recorded within 137 s before and within 354 s after the event. As a result, a systematic decrease with time in the value of the quasi-period of 3.84 s was found, while the value of the quasi-period of 0.768 s at the same time gradually increases. A similar unambiguous result for the quasi-periods of 1.28 s and 2.24 s was not obtained. According to the above estimates, it should be noted that the γ-ray burst itself is located within the time interval when oscillations with quasi-periods of 2.24 s and 3.84 s are in a multiple ratio of ~3/5. Such coincidence can serve as an indication of the significant role of resonance phenomena in the process of formation and flow of a γ-ray burst.
10.18721/JPM.161.271
524.3-59
Gamma-Ray Bursts
GRB 190114C
quasi-periodic oscillations
https://physmath.spbstu.ru/article/2023.64.71/
CNF
RUS
474-479
Ioffe Institute
Ridnaia
Anna
ridnaia@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Frederiks
Dmitry
fred@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Svinkin
Dmitry
svinkin@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Lysenko
Alexandra
alexandra.lysenko@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Tsvetkova
Anastasia
tsvetkova@mail.ioffe.ru
St. Petersburg, Russian Federation
Ioffe Institute
Ulanov
Mikhail
ulanov@mail.ioffe.ru
St. Petersburg, Russian Federation
Search for gamma-ray counterparts to FRBs in Konus-Wind data
We report preliminary results of the search in the Konus-Wind experiment data for hard X-ray/soft γ-ray emission in coincidence with publicly reported fast radio bursts (FRBs). We find no significant associations for any of the 581 FRBs in our sample and report upper limits to the high-energy fluence/peak flux for three spectral shapes, which generally describe short GRB, long GRB and magnetar giant flare spectra. In addition to study each individual FRB, we perform a stacking analysis of the bursts from each repeating source in our sample and a separate stacking analysis of the bursts from the non-repeating FRBs. We find no statistically significant excess of the cumulative emission over background level for either case.
10.18721/JPM.161.272
52-732
fast radio bursts
magnetars
gamma-rays
https://physmath.spbstu.ru/article/2023.64.72/
CNF
RUS
480-484
Irkutsk State University, Institute of Applied Physics
Monkhoev
Roman
makaay08@rambler.ru
Irkutsk, Russian Federation
TAIGA Collaboration*
Method for gamma-hadron separation according to the experimental data of The Tunka-Grande array
The Tunka-Grande array is a part of unified experimental complex, which also includes Tunka-133 and TAIGA-HiSCORE (High Sensitivity COsmic Rays and gamma Explorer) wide-angle Cherenkov arrays, TAIGA-IACT array (Imaging Atmospheric Cherenkov Telescope) and TAIGA-Muon scintillation array. This complex is located in the Tunka Valley (Buryatia Republic, Russia), 50 km from Lake Baikal. It is designed to study the energy spectrum and the mass composition of charged cosmic rays in the energy range 100 TeV–1000 PeV, to search for diffuse gamma rays above 100 TeV and to study local sources of gamma rays with energies above 30 TeV. This report outlines 3 key points. The first is the description of the Tunka-Grande scintillation array. The second one presents the strategy of the search for diffuse gamma rays based on a computer simulation of the Tunka-Grande array. The third one is devoted to the prospects for future research in the field of gamma-ray astronomy using simulation results.
10.18721/JPM.161.273
524.1
cosmic rays
extensive air showers
Tunka-Grande array
https://physmath.spbstu.ru/article/2023.64.73/
CNF
RUS
485-491
Shabalin
Alexander
TaoAstronomer@gmail.com
Charikov
Yuri
y.charikov@yandex.ru
Electron acceleration in models with a vertical current sheet
Model of solar flares with a vertical current sheet and a cusp above the magnetic arcade is considered. In some flares, such magnetic field geometry can be observed directly in the extreme ultraviolet range. According to the model, the relaxation of helmet-like magnetic loops formed due to magnetic field reconnection is supposed. During the relaxation, the magnetic field and the loop length vary with time. Consequently, a betatron acceleration and first-order Fermi electron acceleration appeared. In a kinetic approach the time-dependent kinetic equation for the distribution function of initially accelerated electrons is numerically solved. It is shown that because of such acceleration, the electron energy spectra changes significantly. The proportion of high-energy electrons with energies of more than 200 keV increases by 1–3 orders of magnitude depending on the pitch-angular distribution of accelerated electrons formed in the primary accelerator – the current sheet.
10.18721/JPM.161.274
523.985.3
solar flare
acceleration
magnetic reconnection
https://physmath.spbstu.ru/article/2023.64.74/
CNF
RUS
492-498
Ovchinnikova
Evgeniya
elfimovaevgeniya@gmail.com
X-ray radiation of partially occulted solar flare of May 13, 2013
The X-ray emission of the SOL2013-05-13T02:12 X1.7-GOES-class flare registered by the RHESSI spectrometer was analyzed. Various models of fitting the X-ray spectrum are applied. The following radiation models are considered: a two-temperature hot plasma model, a combination of a thin target model and a single-temperature plasma model, a combination of a bremsstrahlung model of a thick target and quasi-thermal radiation of a single-temperature plasma. Their validity to the spectra for this event is discussed. Plasma parameters are evaluated: emission measures, temperatures and density.
10.18721/JPM.161.275
523.985.3
Sun
solar flares
X-rays
RHESSI
thin target
thick target
bremsstrahlung
https://physmath.spbstu.ru/article/2023.64.75/
CNF
RUS
499-504
Ioffe Institute
Balashev
Sergei
s.balashev@gmail.com
St. Petersburg, Russian Federation
Ioffe Institute
Kosenko
Daria
kosenkodn@yandex.ru
St. Petersburg, Russian Federation
Neutral carbon in the diffuse cold neutral medium
We discuss the relative abundance of CI / H2 in the diffuse cold neutral medium. Using semi-analytical formalism, we describe how CI / H2 depends on the main parameters of the medium: number density, metallicity, strength of the UV field and cosmic ray ionization rate. We show that observed relative abundance of CI / H2 in the high-redshift damped Lyman alpha systems can be reproduced within our model assuming the typical expected conditions in the diffuse cold medium. We also discuss that the observed relative abundance of CI / H2, when coupled with data on the population of the fine structure levels of neutral carbon and the rotational levels of molecular hydrogen can be used to derive the cosmic ray ionization rate in the low-metallicity interstellar medium.
10.18721/JPM.161.276
524.527.3
galaxies
interstellar medium
cosmic rays
https://physmath.spbstu.ru/article/2023.64.76/
CNF
RUS
505-510
St. Petersburg State University
Trofimov
Dmitrii
dm.trofimov@gmail.com
St. Petersburg, Russian Federation
St. Petersburg State University
Petrov
Sergey
s.d.petrov@spbu.ru
St. Petersburg, Russian Federation
Arctic and Antarctic Research Institute
Kalishin
Alexey
askalishin@aari.ru
St. Petersburg, Russian Federation
Arctic and Antarctic Research Institute
Lukin
Valeriy
lukin@aari.ru
St. Petersburg, Russian Federation
Arctic and Antarctic Research Institute
Serov
Yuri
yuras1981@yandex.ru
St. Petersburg, Russian Federation
Bauman Moscow State Technical University
Chekunov
Ilya
onip4@mail.ru
Moscow, Russian Federation
Structure and variations of the south-polar ionosphere by GNSS-tomography
The paper is devoted to determination of the total electron content in the vicinity of the South geomagnetic pole using observations by global navigation satellite systems. Observations were carried out at the Russian Antarctic station Vostok in the periods February 2016 – January 2017, February 2018 – February 2019 and February 2020 – January 2021. Observations were made with satellites of GPS and GLONASS systems. Processing of observations was carried out by use of the TEC-suite software. Total electron content series were obtained for the specified time periods. Our results were compared with those of Center for Orbit Determination in Europe, there is a good agreement, based on which we conclude that our data are reliable. For all periods of observation, average daily profiles of changes in the total electron content in winter and summer were plotted. An excess of the winter total electron content measured from global navigation satellite systems observations over the model data provided by Center for Orbit Determination in Europe by about 5 total electron content unit was noted.
10.18721/JPM.161.277
551.510.535
GNSS
ionosphere
total electron content
https://physmath.spbstu.ru/article/2023.64.77/
CNF
RUS
511-516
Kazan State Power Engineering University
Andreev
Alexey
alexey-andreev93@mail.ru
Kazan, Russian Federation
Kazan (Volga region) Federal University
Nefedyev
Yury
yura.nefedyev@gmail.com
Kazan, Russian Federation
0000-0002-2379-3299
Kazan (Volga region) Federal University
Demina
Natalya
Kazan, Russian Federation
Kazan (Volga region) Federal University
Kolosov
Yury
koloyra@gmail.com
Kazan, Russian Federation
0000-0003-4350-7891
Kazan (Volga region) Federal University
Korchagina
Elena
Kazan, Russian Federation
Multiparametric analysis of celestial bodies as sources of space resources
The work is devoted to the creation of a method based on data from space missions such as LRO (Lunar Reconnaissance Orbiter) and the analysis of possible impactors and meteoroid material for mapping the distribution of minerals on the Moon. In the process of surveys from the Lunar Reconnaissance Orbiter (LRO) spacecraft, the most recent generalized information on the distribution of iron and titanium in the composition of the lunar surface rocks was obtained. To obtain these data, it was necessary to compile a single map from more than 4 thousand images that the LRO spacecraft took during a month of work in a lunar orbit. The processing of the obtained data made it possible to detect areas on the lunar surface containing significant deposits of titanium. The results were calibrated using analyzes of lunar soil samples brought to Earth by the American Apollo missions and Soviet automatic vehicles of the Luna series. Concrete results obtained: Map of mineral distribution gradients depending on selenographic coordinates on the lunar sphere.
10.18721/JPM.161.278
521
Moon
planetary science
asteroids
space missions
https://physmath.spbstu.ru/article/2023.64.78/
CNF
RUS
517-522
Kazan (Volga region) Federal University
Zagidullin
Arthur
star1955@yandex.ru
Kazan, Russian Federation
Kazan State Power Engineering University
Petrova
Natalia
nk_petrova@mail.ru
Kazan, Russian Federation
Kazan (Volga region) Federal University
Nefedyev
Yury
yura.nefedyev@gmail.com
Kazan, Russian Federation
Kazan State Power Engineering University
Andreev
Alexey
alexey-andreev93@mail.ru
Kazan, Russian Federation
Creation of a generalized dynamic model of planetary moons based on an analytical approach for describing the libration processes of their rotation
Our work is devoted to the creation of a generalized dynamic model that describes libration processes in the motion of the natural satellite of the planet, which has been tested on the simulation of the moons rotational parameters(MRPs) of the Earth’s Moon and allows adapting description system of MRPs to other celestial objects, having a librational nature of rotation as well.In this case, it is assumed that an analytical approach was used to describe the rotational motion, which, on the one hand, is rather complicated for solving the equations of rotation and has a lower accuracy than the numerical one, but, on the other hand, the resulting analytical representation of MRPs provides a more convenient tool for analyzing the behavior of MRPs with changes in various parameters, determining the rotational dynamics of the satellite.It is with its help that the procedure of flexible computer simulation of the rotation process and the identification of those observational manifestations, which are determined primarily by the parameters of the figure of a celestial body - the laws of distribution of body mass, compression, non-sphericity.
10.18721/JPM.161.279
521
physical libration
dynamic model of the moon
planets
https://physmath.spbstu.ru/article/2023.64.79/
CNF
RUS
523-529
0000-0003-3447-2500
Kazan (Volga region) Federal University
Sergienko
Maria
Kazan, Russian Federation
Kazan (Volga region) Federal University
Sokolova
Marina
smarina.63@mail.ru
Kazan, Russian Federation
Kazan (Volga region) Federal University
Nefedyev
Yury
yura.nefedyev@gmail.com
Kazan, Russian Federation
Kazan State Power Engineering University
Andreev
Alexey
alexey-andreev93@mail.ru
Kazan, Russian Federation
ρ-Geminids meteor shower and its connection with near-Earth asteroids
In this work, genetic connections (GC) of the small meteor shower ρ-Geminids with near-Earth objects (NEOs) of the Apollo group were studied using the author’s multi-parameter method. The multiparameter method for determining GC of meteor showers with probable parent bodies is based on the use of a set of criteria for identifying orbits, such as: D-criterion by Drummond, Kholshevnikov’s metric, Tisserand’s parameter, μ and ν quasi-stationary parameters of the restricted three-body problem, longitude of perihelion π of meteor orbit. The method of identifying meteoroids with asteroids involves computational procedures and the calculation of critical values for each of the criteria used, which increases the reliability of finding the GC for the objects under study. The catalogues of meteor orbits: Meteoroid Orbit Database v3.0, CAMS and EDMOND 5 v.04 of the European Meteor Network were used as source material in the work.
10.18721/JPM.161.280
521
meteor showers
near-Earth asteroids
orbits of small celestial bodies
genetic relationships between meteor showers and asteroids
https://physmath.spbstu.ru/article/2023.64.80/
CNF
RUS
530-535
Kazan (Volga region) Federal University
Churkin
Konstantin
kchurkin87@gmail.com
Kazan, Russian Federation
Kazan State Power Engineering University
Andreev
Alexey
alexey-andreev93@mail.ru
Kazan, Russian Federation
Kazan (Volga region) Federal University
Nefedyev
Yury
yura.nefedyev@gmail.com
Kazan, Russian Federation
Kazan (Volga region) Federal University
Kolosov
Yury
koloyra@gmail.com
Kazan, Russian Federation
0000-0003-4350-7891
Kazan (Volga region) Federal University
Korchagina
Elena
Kazan, Russian Federation
0000-0002-2379-3299
Kazan (Volga region) Federal University
Demina
Natalya
Kazan, Russian Federation
Kazan State University of Architecture and Engineering
Borovskih
Viktor
borovskix@kgasu.ru
Kazan, Russian Federation
Analysis of comet C/1969 Y1 parameters using isophote structural modeling
This work is devoted to the construction of a brightness structural model of the long-period comet Bennett C/1969 Y1. This comet belongs to the comets of the Jupiter family (JF) and has a Tisserand’s parameter T > 2. Determining the brightness characteristics of the comet has been one of the most important goals of cometary observations over the past century. The complexity of such studies lies in the fact that we are dealing with extended sources moving relative to background stars. The problem of obtaining reliable estimates of the distribution of brightness parameters (BPs) for long-period comets also remains especially important, because for many of them observations were made back in the days when high-precision methods, such as CCD-matrices and other technical tools, were not available. At the same time, most of the determined stellar magnitudes of long-period comets were related to the gaseous coma surrounding the comet’s nucleus, and not to the comet’s nucleus itself. At the same time, cosmic ultraviolet observations of comets in the Lyman-alpha hydrogen lines made it possible to obtain very important data for estimating the emission of H2O by the cometary nucleus, as well as other types of molecules (e.g. C2, C3, CN, OH). In the presence of dependencies between the productivity of the H2O cometary nucleus and its brightness characteristics, the determination of BPs of cometary nuclei has acquired a new meaning. However, the dependence of the size of the nucleus on its BPs is not linear, since there is a correlation with the albedo of the surface of the nucleus. In this work, BPs and albedo for comet Bennett C/1969 Y1 are studied. Taking into account the data obtained and the solution of the described problems, we applied the author’s isophote method to analyze the structure of the brightness characteristics of Bennett C/1969 Y1.
10.18721/JPM.161.281
521
comets
planetary science
isophote analysis
https://physmath.spbstu.ru/article/2023.64.81/
CNF
RUS
536-543
Pitirim Sorokin Syktyvkar State University
Antonets
Igor
aiv@mail.ru
Syktyvkar, Russian Federation
Determination of the conductive and structural characteristics of zirconium-containing amorphous nanogranulated composites from the microwave reflection coefficient
Amorphous nanogranulated composite films ((Со45Fе45Zr10)x(ZrO)1-x and (Со45Fе45Zr10)x(Zr2O3)1-x) were studied experimentally. The film thickness, metal phase concentration, granules size, conductivity, and reflection coefficient of microwave waves at a frequency of 10 GHz were determined. A sequential algorithm for determining the conductive (grain conductivity) and structural (size of grains or gaps between granules, electron mean free path) characteristics from the measured microwave reflection coefficient for amorphous nanogranular composites is given. Using the algorithm and mechanism of intragranular currents based on experimental results, the conductivity of granules, the size of the gaps between the granules and the electron mean free path for zirconium containing series of films (Со45Fе45Zr10)x(ZrO)1-x and (Со45Fе45Zr10)x(Zr2O3)1-x were estimated. The dependences of the conductive and structural characteristics of the samples on the microwave reflection coefficient, the concentration of the metal phase and the effective thickness were obtained.
10.18721/JPM.161.282
538.975
Amorphous nanogranulated composite films
conductivity of granules
microwave reflection coefficient
mechanism of intragranular currents
electron mean free path
https://physmath.spbstu.ru/article/2023.64.82/
CNF
RUS
544-549
Ioffe Institute
Sidorov
Anton
sidorov@mail.ioffe.ru
St. Petersburg, Russian Federation
Federal research center “Institute of applied physics RAS”
Veselov
Alexey
veselov@ipfran.ru
Nizhni Novgorod, Russian Federation
Federal research center “Institute of applied physics RAS”
Rakova
Elena
eir@ipfran.ru
Nizhni Novgorod, Russian Federation
Federal research center “Institute of applied physics RAS”
Barmashova
Tatyana
tanyabarmashova@ipfran.ru
Nizhni Novgorod, Russian Federation
Federal research center “Institute of applied physics RAS”
Vodopyanov
Alexander
avod@ipfran.ru
Nizhni Novgorod, Russian Federation
Federal research center “Institute of applied physics RAS”
Ananichev
Andrey
a0810@ipfran.ru
Nizhni Novgorod, Russian Federation
Federal research center “Institute of applied physics RAS”
Glyavin
Mikhail
glyavin@ipfran.ru
Nizhni Novgorod, Russian Federation
Ionization wave in air under the action of powerful radiation of the terahertz frequency range
Sub-terahertz and terahertz frequency ranges remain the least studied from the point of view of gas discharge physics. Investigation of terahertz gas discharge, sustained by the powerful focused beams of the electromagnetic radiation, has become possible recently due to the development of the powerful sources in this range (FELs and gyrotrons) and is of interest both from a fundamental research and from possible applications. This work presents the results of the studies of the discharge propagation under the action of the focused beam of sub-terahertz (250 GHz) gyrotron. The discharge propagation velocity towards electromagnetic radiation was measured in air in the wide pressure range (0.01 – 1 atm). The focusing system provided the size of the focal spot of (2–3)·λ, which ensured the investigation of discharge phenomena in a wide pressure range. The optical glow of the discharge was recorded with the help of a speed camera. The discharge appeared in the focal spot spread towards heating radiation into the area with the field intensity much less than one in the focal spot. Velocity of the discharge propagation was measured by using photos from speed camera with small exposure (down to 20 ns). It was demonstrated that discharge velocity increase along with pressure decrease and drops with electric field decrease as it moves away from the focal spot.
10.18721/JPM.161.283
533.9
terahertz radiation
gas discharge
discharge propagation
https://physmath.spbstu.ru/article/2023.64.83/
CNF
RUS
550-556
Volgograd State Socio-Pedagogical University
Kryuchkov
Sergei
svkruchkov@yandex.ru
Volgograd, Russian Federation
Volgograd State Technical University
Kukhar
Egor
eikuhar@yandex.ru
Volgograd, Russian Federation
Generation of multi-mode velocity of electrons in a Dirac crystal in the monochromatic field
Multi-mode dynamics with Zitterbewegung of an electron in 2D Dirac crystal placed in the field of monochromatic radiation is studied. For calculations, a model Hamiltonian taking into account two independent Dirac points has been used. Calculations have shown that the spectrum of electron oscillations contains a series of new (compared to the usual Zitterbewegung) frequencies. The latter, in the case of a high radiation frequency, are a combination of the Zitterbewegung frequency and frequencies that are multiples of the field frequency. In the case when the field frequency is comparable to the Zitterbewegung frequency, the spectrum of electron oscillations is determined by the field amplitude. The character of this dependence has been shown to be changed by variation of the direction of radiation polarization. The possibility of the appearance of a constant component of the electron velocity in the field of monochromatic radiation is also discussed.
10.18721/JPM.161.284
537.9
Zitterbewegung
graphene
Dirac crystal
Rabi frequency
https://physmath.spbstu.ru/article/2023.64.84/
CNF
RUS
557-564
Emanuel Institute of Biochemical Physics, RAS
Chukov
Vitalii
vchukov@mail.ru
Moscow, Russian Federation
Structure of acoustic Lauegram on the Ewald circle of reflection for the Rayleigh wave scattering
The acoustic Lauegram of the Rayleigh wave the Laue–Bragg–Wulff high-frequency scattering on a rectangle rough band of an isotropic solid, having periodic lattice of an arbitrary number of the roughness discontinuities, is theoretically investigated in details in dependence on the angle of scattering φs at a fixed ratio of the lattice unit cell size to the wavelength and parameters of the lattice. The Ewald conception of the circle of reflection is used. The problem of an arbitrary number, defined beforehand, of the resonances of scattering, i.e. nodes of the reciprocal lattice, for any φs, defined beforehand, lying on the Ewald circle of reflection, is first solved analytically in the present work in the classical case, i.e. without influence of the amplitude form-factor of the lattice. It is found, that increasing of the number of resonances for any φs is necessarily accompanied by the increasing of the Ewald circle of reflection radius, i.e. of the Rayleigh wave frequency, at fixed sizes of a discontinuities lattice. It is obtained first, that amplitude form-factor of the discontinuities lattice strongly influences the structure of the acoustic Lauegram: arbitrary number of the resonances of scattering for any φs can be placed on the Ewald circle of reflection without variation of its radius by using of the appropriate amplitude form-factor of a discontinuities lattice of a solid roughness.
10.18721/JPM.161.285
534.26
Rayleigh wave
Laue scattering
Bragg–Wulff reflection
https://physmath.spbstu.ru/article/2023.64.85/