2304-9782, 2618-8686, 2405-7223 12 4 2019 1-148

RAR RUS 9-16 Herzen State Pedagogical University of Russia Guliakova Anna a.guliakova@gmail.com

St. Petersburg

Herzen State Pedagogical University of Russia Gorokhovatskiy Yuriy yurig@fromru.com 0000-0001-5647-1854 Kazan National Research Technological University Galikhanov Mansour Postdam University of Germany Frübing Peter 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 Blagoveschensk State Pedagogical University Baryshnikov Sergey svbar2003@list.ru Amur State University Stukova Elena 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 Peter the Great St. Petersburg Polytechnic University Baranov Maksim baranovma1993@gmail.com Peter the Great St. Petersburg Polytechnic University Velichko Elena velichko-spbstu@ya.ru Peter the Great St. Petersburg Polytechnic University Rozov Sergey 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 Volgograd State University Lebedeva Olga lebedeva_os@volsu.ru Volgograd State University Lebedev Nikolay nikolay.lebedev@volsu.ru Volgograd State Agricultural University Lyapkosova Irina 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 Peter the Great St. Petersburg Polytechnic University Sinitsyna Darya sinicina.daria@yandex.ru Peter the Great St. Petersburg Polytechnic University Yuhnev Andrey a.yukhnev@mail.ru Peter the Great St. Petersburg Polytechnic University Zaytsev Dmitry zaitsev-aero@yandex.ru Peter the Great St. Petersburg Polytechnic University Turkina Maria 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 PJSC “Power Machines” Mannanov Emil Mannanov_ER@power-m.ru

St. Petersburg, Russian Federation

St. Petersburg Electrotechnical University "LETI" Galunin Sergei 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 Ioffe Physical Technical Institute of the Russian Academy of Sciences Kuleshova Tatiana www.piter.ru@bk.ru Ioffe Physical Technical Institute of the Russian Academy of Sciences Pavlova Ekatherina sheshenayket@gmail.com Institute for Analytical Instrumentation Titov Yuriy titov.uriy@gmail.com Institute for Analytical Instrumentation Kuzmin Alexey agqz55@rambler.ru Institute for Analytical Instrumentation of the Russian Academy of Sciences Gall Nikolai 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 Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS Aladov Andrei

Russia, 194021, St.Petersburg, Polytechnicheskaya, 26

Peter the Great St. Petersburg Polytechnic University Valjukhov Vladimir Valyukhov@yandex.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS Zakgeim Alexander zakgeim@mail.ioffe.ru

Russia, 194021, St.Petersburg, Polytechnicheskaya, 26

0000-0001-8594-9423 Peter the Great St. Petersburg Polytechnic University Kuptsov Vladimir kuptsov@spbstu.ru Research and Development Center of Biomedical Photonics Mamoshin Andrian dr.mamoshin@mail.ru Research and Development Center of Biomedical Photonics Potapova Elena potapova_ev_ogu@mail.ru. Submicron Heterostructures for Microelectronics Research and Engineering Center of the RAS Chernyakov Anton chernyakov.anton@yandex.ru

Russia, 194021, St.Petersburg, Polytechnicheskaya, 26

AAD-9657-2019 57197390995 Peter the Great St. Petersburg Polytechnic University Fotiadi Alexander 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 Peter the Great St. Petersburg Polytechnic University Vakulenko Aleksandr sasha705@mail.ru 0000-0003-4867-1404 Ioffe Institute of the Russian Academy of Sciences Vakhrushev Sergey s.vakhrushev@mail.ioffe.ru 0000-0002-2793-5717 Peter the Great St. Petersburg Polytechnic University Filimonov Alexey filimonov@rphf.spbstu.ru

St. Petersburg, Russian Federation

Xian Jiaotong University Zhang Nan 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 Peter the Great St. Petersburg Polytechnic University Privalov Vadim kafedra@physics.spbstu.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

AAD-9657-2019 57197390995 Peter the Great St. Petersburg Polytechnic University Fotiadi Alexander 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 Peter the Great St. Petersburg Polytechnic University Pavlov Alexander a.pavlov@physics.spbstu.ru M-5766-2013 57192222016 0000-0002-3584-4583 Peter the Great St. Petersburg Polytechnic University Ivanov Vadim ivanov_vk@spbstu.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

MBN Research Center at Frankfurt Innovation Center of Biotechnology Korol Andrei korol@mbnexplorer.com

Frankfurt am Main, Germany

7003387326 0000-0003-1602-6144 MBN Research Center at Frankfurt Innovation Center of Biotechnology Solov'yov Andrei 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 Baikal State University Timofeev Sergey timofeevsv12@gmail.com Baikal State University Sukhodolov Alexander 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 Peter the Great St. Petersburg Polytechnic University Bulovich Sergei bulovic@yandex.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Ioffe Physical Technical Institute of the Russian Academy of Sciences Masiukevich Aleksei 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