2304-9782, 2618-8686, 2405-7223
St. Petersburg Polytechnic University Journal. Physics and Mathematics
12
4
2019
1-148
RAR
RUS
9-16
Guliakova
Anna
Herzen State Pedagogical University of Russia
a.guliakova@gmail.com
St. Petersburg
Gorokhovatskiy
Yuriy
Herzen State Pedagogical University of Russia
yurig@fromru.com
Galikhanov
Mansour
mgalikhanov@yandex.ru
Frübing
Peter
Postdam University of Germany
frubing@uni-potsdam.de
Potsdam, Germany
Thermoactivational spectroscopy of the high impact polystyrene based composite films
The relaxation processes in the high impact polystyrene (HIPS) films filled with 2, 4, 6 vol.% of titanium dioxide (TiO2) of the rutile modification have been studied using the thermally stimulated depolarization current (TSDC) technique. Three relaxation processes were observed in the composite HIPS films. The first one (α-relaxation peak) appeared at about 93 °C and represented the glass transition. The second peak ρ was a high-temperature part of the first one and overlapped it. The ρ peak was caused by the release and subsequent motion of excess charges deposited during the electret preparation or the polarization process. The third peak appeared at about 150 °C and occurred only in the spectra of the composite films. The overlapping peaks were separated by the thermal cleaning technique. The subsequent application of the numerical methods (the Tikhonov regularization technique) allowed to determine the activation energy of the second process and to compare the obtained value with the corresponding data on the dielectric relaxation.
10.18721/JPM.12401
541.64: 678
thermoactivational spectroscopy
high impact polystyrene
titanium dioxide
https://physmath.spbstu.ru/article/2019.46.1/
1_9-16_12(4)2019.pdf
RAR
RUS
17-24
Baryshnikov
Sergey
Blagoveschensk State Pedagogical University
svbar2003@list.ru
Stukova
Elena
Amur State University
lenast@bk.ru
Meredelina Tatiana A.
biofirm@mail.ru
Ferroelectric properties of composites based on diisopropylammonium bromide and lead titanate
The results of a study of linear and nonlinear dielectric properties, as well as calorimetric measurements of a ferroelectric composite (C6H16NBr)1–x/(PbTiO3)x with a volume fraction x = 0.1, 0.2, 0.3 of lead titanate particles are presented. It has been shown that the addition of lead titanate particles to diisopropylammonium bromide leads to a change in the sequence of structural phase transitions in the diisopropylammonium bromide, an increase in the effective dielectric constant and tanδ values. In a temperature range of 150 – 138 ° C, there were two C6H16NBr phases (ferroelectric P21 and nonferroelectric P212121). The proportion among these phases depended on the fraction of lead titanate particles in the composite.
10.18721/JPM.12402
537.226
ferroelectric
dielectric constant
composite
phase transition
https://physmath.spbstu.ru/article/2019.46.2/
2_17-24_12(4)2019.pdf
RAR
RUS
25-37
Baranov
Maksim
Peter the Great St. Petersburg Polytechnic University
baranovma1993@gmail.com
Velichko
Elena
Peter the Great St. Petersburg Polytechnic University
velichko-spbstu@ya.ru
Rozov
Sergey
Peter the Great St. Petersburg Polytechnic University
svroz@yandex.ru
Dehydrated films of protein solutions: structural properties
In this paper, the formation of various characteristic dissipative structures in the films of aqueous and aqueous-salt solutions of albumin protein in dehydration processes is considered. It has been shown that a number of parameters for conducting experiments on solution dehydration affect the shape and spatial distribution of two-dimensional structural formations in films of protein solutions. A conclusion was drawn on the importance of the structural self-organization of films in the process of their dehydration.
10.18721/JPM.12403
53.093, 53.096, 57.031, 57.033, 57.038
self-organization process
dissipative structure
protein film
https://physmath.spbstu.ru/article/2019.46.3/
3_25-37_12(4)2019.pdf
RAR
RUS
38-49
Lebedeva
Olga
Volgograd State University
lebedeva_os@volsu.ru
Lebedev
Nikolay
Volgograd State University
nikolay.lebedev@volsu.ru
Lyapkosova
Irina
Volgograd State Agricultural University
lyapkosova_irina@mail.ru
Elastic conductivity of silicene and germanene nanoribbons
The theoretical research results for piezoresistive properties of ideal silicene and germanene nanoribbons with different conductivity types have been presented. Within the framework of the Hubbard model, the band structure of the nanoparticles under investigation was simulated and a longitudinal component of their elastoconductivity tensor was analytically calculated. For this tensor, the dependences on the relative strain of longitudinal compression/tension as well on the nanoribbon width were studied.
10.18721/JPM.12404
538.915+975; 544.22.022.343; 544.225.22+25
2D structure
silicene
germanene
stress-strain state
piezoresistive effect
elastroconductivity tensor
https://physmath.spbstu.ru/article/2019.46.4/
4_38-49_12(4)2019.pdf
RAR
RUS
50-60
Sinitsyna
Darya
Peter the Great St. Petersburg Polytechnic University
sinicina.daria@yandex.ru
Yuhnev
Andrey
Peter the Great St. Petersburg Polytechnic University
a.yukhnev@mail.ru
Zaytsev
Dmitry
Peter the Great St. Petersburg Polytechnic University
zaitsev-aero@yandex.ru
Turkina
Maria
Peter the Great St. Petersburg Polytechnic University
turkinamaria@mail.ru
The flow structure in a three-dimensional model of abdominal aortic bifurcation: ultrasonic and numerical study
A numerical and experimental research of fluid flow structure on a model involving statistical-average bifurcations of the abdominal aorta and iliac arteries with an axisymmetric stenosis in the right common iliac artery has been conducted. It was shown that a two-vortex flow formed in the external iliac artery transforms a downstream into a four-vortex flow. The stenosis in the common iliac artery leads to formation of a recirculation zone behind it, namely, at the inner wall of the vessel. The following spatial bend of the external iliac artery leads to generation of a swirling flow in this vessel. A transitional flow, from a two-vortex to a single-vortex motion, forms in the internal iliac arteries.
10.18721/JPM.12405
532.5+612.13
abdominal aorta’s bifurcation
spatial bending of vessel
stenosis
ultrasound Doppler method
https://physmath.spbstu.ru/article/2019.46.5/
5_50-60_12(4)2019.pdf
RAR
RUS
61-68
Mannanov
Emil
PJSC “Power Machines”
Mannanov_ER@power-m.ru
St. Petersburg, Russian Federation
Galunin
Sergei
St. Petersburg Electrotechnical University "LETI"
galunin@mail.ru
The heating of a diaphragm spring using induction technique: parametric modeling
The configuration and work of a system for local heating of a diaphragm spring by induction technique have been studied. The problem-oriented 3D model developed using ANSYS APDL, made possible to analyze effects of geometric, electrical and positional parameters on temperature distribution over the considered product in its electromagnetic heat treatment. In particular, the temperature fields were obtained varying spring finger’s number and length, as well as a control of a finger's bend with setting up a heating mode. The main connections between the final temperature distributions and the geometry of the heated product were established. The heating was generated using both longitudinal and transverse magnetic fields.
10.18721/JPM.12406
537.856
induction heating
numerical simulation
optimization
heat treatment
diaphragm spring
https://physmath.spbstu.ru/article/2019.46.6/
6_61-68_12(4)2019.pdf
RAR
RUS
69-78
Kuleshova
Tatiana
Ioffe Physical Technical Institute of the Russian Academy of Sciences
www.piter.ru@bk.ru
Pavlova
Ekatherina
Ioffe Physical Technical Institute of the Russian Academy of Sciences
sheshenayket@gmail.com
Titov
Yuriy
Institute for Analytical Instrumentation
titov.uriy@gmail.com
Kuzmin
Alexey
Institute for Analytical Instrumentation
agqz55@rambler.ru
Gall
Nikolai
Institute for Analytical Instrumentation of the Russian Academy of Sciences
gall@ms.ioffe.ru
Russia, 190103, St. Petersburg, 26 Rizhsky Ave.
Sample preparation for a mass-spectrometric analysis of 13С/12С isotope fractionation from environment to the plant carbon pool
In order to study the differences in the 13C and 12C isotopes assimilation degree related to the rate of photosynthetic reactions, we have developed a number of procedures of sample gasification and a hardware experimental complex for sample preparation before a mass-spectrometric isotope analysis of carbon involved in a plant life. A setup for concentrating the carbon dioxide located around the plant was designed and made. The setup makes catalytic afterburning of organic microimpurities available for increasing the carbon content more than a hundred times. A reaction procedure for oxidation of leaf glucose by yeast generating carbon dioxide was suggested, reagent concentrations selected. The collected samples were free from impurities (not exceeding 10–5). The developed sample preparation technique was used to study the effect of the light exposure characteristics on the carbon isotope interchange between atmospheric CO2 and the plant carbon pool.
10.18721/JPM.12407
544.582
carbon isotopes
plant
sample preparation
mass spectrometric analysis
CO2 concentration
https://physmath.spbstu.ru/article/2019.46.7/
7_69-78_12(4)2019.pdf
RAR
RUS
79-88
Aladov
Andrei
Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS
Russia, 194021, St.Petersburg, Polytechnicheskaya, 26
Valjukhov
Vladimir
Peter the Great St. Petersburg Polytechnic University
Valyukhov@yandex.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
Zakgeim
Alexander
Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS
zakgeim@mail.ioffe.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya, 26
Kuptsov
Vladimir
kuptsov@radio.rphf.spbstu.ru
Mamoshin
Andrian
Research and Development Center of Biomedical Photonics
dr.mamoshin@mail.ru
Potapova
Elena
Research and Development Center of Biomedical Photonics
potapova_ev_ogu@mail.ru.
Chernyakov
Anton
Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS
chernyakov.anton@yandex.ru
Russia, 194021, St.Petersburg, Polytechnicheskaya, 26
AAD-9657-2019
57197390995
Fotiadi
Alexander
Peter the Great St. Petersburg Polytechnic University
fotiadi@rphf.spbstu.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
Optimization of surgical field illumination to maximize the contrast when biological objects being visualized
The optimal lighting conditions for contrast imaging of biological tissues during surgical operations have been studied. In so doing a special experimental setup based on a dynamically controlled led lighting system was used. The operating team selected the optimal illumination of the operating field during work with individual organs and tissues of animals (rats); simultaneously experimental investigations of the spectral characteristics of these biological objects were carried out. Relying on such experimental data, an analysis of luminance and color contrasts, including a comparison with a halogen lamp effect. According to results of studies the need to use special lighting with optimization of its intensity and a wavelength spectrum was confirmed. Such a measure will increase the contrast during surgical operations.
10.18721/JPM.12408
628.94, 617-7
LEDs
RGB-mixing
dynamic light control
surgical lamp
contrast visualization of biological tissues
https://physmath.spbstu.ru/article/2019.46.8/
8_79-88_12(4)2019.pdf
RAR
RUS
89-96
Vakulenko
Aleksandr
Peter the Great St. Petersburg Polytechnic University
sasha705@mail.ru
Vakhrushev
Sergey
Ioffe Institute of the Russian Academy of Sciences
s.vakhrushev@mail.ioffe.ru
Filimonov
Alexey
Peter the Great St. Petersburg Polytechnic University
filimonov@rphf.spbstu.ru
St. Petersburg, Russian Federation
Zhang
Nan
Xian Jiaotong University
ic@mail.xjtu.edu.cn
An automatic system for measuring the ferroelectric hysteresis loops using the modified Sawyer – Tower circuit
In the article, an equipment and practical application of an automatic system (created by the authors) for measuring the ferroelectric hysteresis loops using the Atmega328 microcontroller have been considered. The modern approaches to the classical Sawyer – Tower circuit's application was analyzed, and practical need for such development was proven. The schematic diagram and description of the main device’s components were given. Test results on measuring the hysteresis loops in a barium titanate single crystal were presented, and they were compared with the data published earlier. Moreover, the results on measuring the ferroelectric hysteresis loops of an [110]-oriented 0.8Pb(Mb1/3Nb2/3)O3–0.2PbTiO3 single crystal in a temperature range of 120 –300 K at frequencies from 2 to 50 Hz were presented.
10.18721/JPM.12409
538.956 и 621.317.7
polarization
ferroelectric
hysteresis
Sawyer – Tower circuit
https://physmath.spbstu.ru/article/2019.46.9/
9_89-96_12(4)2019.pdf
RAR
RUS
97-107
Kozhevnikov
Vadim
vadim.kozhevnikov@gmail.com
7006335646
Privalov
Vadim
Peter the Great St. Petersburg Polytechnic University
kafedra@physics.spbstu.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
AAD-9657-2019
57197390995
Fotiadi
Alexander
Peter the Great St. Petersburg Polytechnic University
fotiadi@rphf.spbstu.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
Positive column of a direct current discharge in laser tubes of variable diameter
A positive column of a direct current discharge in monoatomic gas is considered and expressions are obtained that relate the external parameters of the column (varying radius of the discharge channel, gas pressure and discharge current) to the “internal” characteristics (concentration of charged particles, electron temperature, and longitudinal electric field strength).
10.18721/JPM.12410
533.9.01
positive column plasma characteristic
variable diameter laser tube
active element geometry
https://physmath.spbstu.ru/article/2019.46.10/
10_97-107_12(4)2019.pdf
RAR
RUS
108-118
Pavlov
Alexander
Peter the Great St. Petersburg Polytechnic University
a.pavlov@physics.spbstu.ru
M-5766-2013
57192222016
0000-0002-3584-4583
Ivanov
Vadim
Peter the Great St. Petersburg Polytechnic University
Ivanov@physics.spbstu.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
Korol
Andrei
MBN Research Center at Frankfurt Innovation Center of Biotechnology
korol@mbnexplorer.com
Frankfurt am Main, Germany
7003387326
0000-0003-1602-6144
Solov'yov
Andrei
MBN Research Center at Frankfurt Innovation Center of Biotechnology
solovyov@mbnresearch.com
3 Altenhöferallee, Frankfurt am Main, 60438, Germany
Radiation of 375 MeV electrons and positrons during channeling in straight and periodically bent diamond crystals
The paper presents the results of calculation and analysis of the trajectories and emission spectra of ultrarelativistic electrons and positrons with an energy of 375 MeV channeling in straight and periodically bent diamond crystals with a length of 20 and 40 μm. The numerical simulation of planar channeling of particles along the crystallographic plane (110) is carried out using the MBN Explorer package. The parameters of the particle beams and the orientation of the crystals are chosen close to the experimental conditions at the MAMI accelerator (Mainz, Germany). The comparison between the results obtained for electrons and positrons is performed.
10.18721/JPM.12411
538.911
ultrarelativistic electrons and positrons
periodically bent diamond crystal
channeling radiation
https://physmath.spbstu.ru/article/2019.46.11/
11_108-118_12(4)2019.pdf
RAR
RUS
119-134
Timofeev
Sergey
Baikal State University
timofeevsv12@gmail.com
Sukhodolov
Alexander
Baikal State University
science@bgu.ru
A model of new information dissemination in the society
In the article, a basic mathematical model of new information dissemination in the society is constructed and studied. The suggested model has been described using the system of four ordinary differential equations with square nonlinearity in the right parts. Two stationary solutions furnishing quite logical interpretation for this system were found. Two areas with various properties of stationary solutions were separated in the parameters’ space of the system. The global properties of a phase pattern of the constructed dynamic system were investigated by qualitative methods of the differential equations theory. The obtained results allowed finding several possible scenarios of new information dissemination in the society.
10.18721/JPM.12412
517.938:070
dissemination of new information
stationary solution of system
invariant set
asymptotic stability
https://physmath.spbstu.ru/article/2019.46.12/
12_119-134_12(4)2019.pdf
RAR
RUS
135-144
Bulovich
Sergei
Peter the Great St. Petersburg Polytechnic University
bulovic@yandex.ru
Russia, 195251, St.Petersburg, Polytechnicheskaya, 29
Masiukevich
Aleksei
Ioffe Physical Technical Institute of the Russian Academy of Sciences
79313165906@yandex.ru
The interaction of a shock wave with a permeable layer: an experimental study
In the paper, the interaction of a shock wave with a granular layer of spherical particles has been experimentally studied in an atmospheric shock tube. A near-edge space of pure gas was located between the porous layer and the tube’s end wall. Two problem statements were considered. In the first embodiment, the structure and position of the porous layer remained unchanged. In the second one, the granular layer was destroyed under the action of the incident shock wave and turned into a mobile cloud of particles. For both variants, wave structures that occur both in front of the porous layer of granular particles and in the gap between the granular layer and the end wall of the shock tube were derived and analyzed. The initial information was obtained by measuring and recording equipment, which included piezoelectric pressure sensors and a multichannel ADC board for data collection.
10.18721/JPM.12413
532.529:532.59:534.2
shock wave
permeable material layer
nonstationary gas filtration
wave structure
https://physmath.spbstu.ru/article/2019.46.13/
13_135-144_12(4)2019.pdf