2304-9782, 2618-8686, 2405-7223 17 1 2024 1-132

RAR RUS 9-20 Peter the Great St. Petersburg Polytechnic University Kozlovski Vitaly vkozlovski@phmf.spbstu.ru Ioffe Institute Lebedev Alexander shura.lebe@mail.ioffe.ru

St. Petersburg, Russian Federation

Ioffe Institute of RAS Kuzmin Roman kuzminra@mail.ioffe.ru Ioffe Institute Malevskiy Dmitriy dmalevsky@scell.ioffe.ru

St. Petersburg, Russian Federation

Ioffe Institute of RAS Levinshtein Mikhail melev@nimis.ioffe.ru Ioffe Institute of RAS Oganesjan Gagik.A. Gagik.Oganesyan@mail.ioffe.ru The electron and proton irradiation effects on the properties of high-voltage 4H-SiC Schottky diodes within the operating temperature range In the paper, the effects of type, dose and temperature of irradiation with stable elementary particles (0.9 MeV electrons and 15 MeV protons) on the properties of the high-voltage 4H-SiC Junction Barrier Schottky diodes at room temperature (23°С) and the limiting operating one (175°С) have been compared. The electron irradiation of the objects with equal doses at 23°С и 175°С was found to cause a significant increase in its base differential resistance in the former case and the absence of this effect in the latter. However, in the latter, DLTS spectra exhibited a noticeable increase in the concentration of deep levels in the upper half of the band gap. The proton irradiation resulted in a noticeable rise in the mentioned resistance even at 175°С. The results obtained make it possible to evaluate the radiation resistance of the studied devices to proton and electron irradiation within the framework of any given requirements. 10.18721/JPM.17101 621.38:539.1 silicon carbide Schottky diode irradiation DLTS spectrum current–voltage characteristic annealing https://physmath.spbstu.ru/article/2024.71.1/ 01_9-20_17(1)2024.pdf

RAR RUS 21-28 0000-0002-2793-5717 Peter the Great St. Petersburg Polytechnic University Filimonov Alexey filimonov@rphf.spbstu.ru

St. Petersburg, Russian Federation

Peter the Great St. Petersburg Polytechnic University Bondarenko Vyacheslav vyacheslav.b.bondarenko@mail.ru A chaotic potential of charged dislocations in group III-nitride heterojunctions during localization of a two-dimensional electron gas This work studies a chaotic potential (CP) in the heterojunctions of III-nitrides, the CP caused by the electrostatic field of charged dislocations, under localization conditions of a two-dimensional electron gas in the near-contact region. Within the framework of the statistical analysis of a Poisson ensemble of linear defects, the amplitude and scale of the CP in the contact plane have been determined. The CP parameter dependence on the density of surface states and the concentration of dislocations at the mobility threshold of the two-dimensional electron gas was shown. The CP amplitude was established to exceed 100 meV in a wide range of changes in the system parameters, in the presence of electronic charge localization effects in the heterojunctions. 10.18721/JPM.17102 538.915 chaotic potential III-nitride heterojunction two-dimensional electron gas natural size effect https://physmath.spbstu.ru/article/2024.71.2/ 02_21-28_17(1)2024i.pdf

RAR RUS 29-37 0000-0001-9604-4769 Herzen State Pedagogical University of Russia Karulina Elena karulina@mail.ru 0000-0002-1536-5841 Herzen State Pedagogical University of Russia Volgina Elena 0009-0002-3569-4981 Herzen State Pedagogical University of Russia Kulemina Sofya 0000-0001-5647-1854 Kazan National Research Technological University Galikhanov Mansour 0000-0002-8859-5621 Kazan National Research Technological University Minzagirova Alsu The effect of the montmorillonite-based filler on the electret properties of polypropylene In the paper, the studies of electret properties of polypropylene with different percentages of montmorillonite have been carried out by methods of thermally stimulated potential relaxation and thermally stimulated currents. A significant effect of filler concentration on the electret state stability was revealed. The parameters of electrically active defects and the storage time of the electret state were determined. It was established that polypropylene with a 4% mass content of montmorillonite exhibited the best electret properties. 10.18721/JPM.17103 538.9 electret composite polymer film electret state polypropylene montmorillonite https://physmath.spbstu.ru/article/2024.71.3/ 03_29-37_17(1)2024.pdf

RAR RUS 38-46 0000-0002-4172-940X Alferov University Dvoretckaia Liliya 0000-0002-8661-4083 Alferov University Mozharov Alexey mozharov@spbau.ru

St. Petersburg, Russian Federation

0000-0001-8179-3169 Alferov University Goltaev Aleksandr 0000-0001-5547-9387 Alferov University Fedorov Vladimir fedorov_vv@spbstu.ru 0000-0001-9792-045X Peter the Great St. Petersburg Polytechnic University Mukhin Ivan muhin_is@spbstu.ru Numerical simulation of operating modes of heterostructural photodiodes based on indium arsenide nanowires on the silicon substrates The paper presents the results of numerical simulation of the heterostructural diodes operation based on the array of indium arsenide nanowires on the silicon substrates with different polarities, namely n- or p-types. It has been found that it is possible to achieve theoretical values of the ideality factor equal to 1.1 and 2.1 respectively. The high quantum efficiency values are typical for the investigated heterostructures during separation of photogenerated charge carriers in the temperature range of 150–300 K. 10.18721/JPM.17104 621.383.522 indium arsenide nanowire heterostructure silicon substrate numerical calculation https://physmath.spbstu.ru/article/2024.71.4/ 04_38-46_17(1)2024.pdf

RAR RUS 47-55 0000-0003-2327-068X Mechanical Engineering Research Institute of the RAS Alifov Alishir a.alifov@yandex.ru Oscillations under a nonlinear parametric action and combinations of delays The paper considers oscillations under nonlinear parametric action and combinations of delays in elasticity and damping. The model for the study is a rod with a spring, which is driven by an energy source of limited power. To solve nonlinear differential equations of motion of the system, the method of direct linearization of nonlinearity has been used. Equations were obtained for determining the nonstationary and stationary values of the amplitude and phase of oscillations, the speed of the energy source. Based on the Routh – Hurwitz criteria, the conditions for the stability of stationary motion modes were derived. To obtain information about the combined effect of delays on the dynamics of oscillations, the calculations were carried out for their various values, linear and nonlinear elastic forces. The graphs constructed based on the calculation results clearly show the combined effect of various delay values on the amplitude-frequency curves. The delays measure the amplitude curve, shift it to the right-left, up-down, and affect the stability of the oscillations. 10.18721/JPM.17105 534.16 oscillation model nonlinearity method parametric excitation delay elasticity damping https://physmath.spbstu.ru/article/2024.71.5/ 05_47-55_17(1)2024.pdf

RAR RUS 56-63 0000-0002-6210-4003 Peter the Great St. Petersburg Polytechnic University Ermak Sergey 0000-0003-0346-8349 Peter the Great St. Petersburg Polytechnic University Semenov Vladimir vladimir_semenov@mail.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

0000-0001-7095-7981 Peter the Great St. Petersburg Polytechnic University Baranov Alexey 0009-0009-6180-6538 Peter the Great St. Petersburg Polytechnic University Rogatin Maxim 0009-0005-8838-6845 Peter the Great St. Petersburg Polytechnic University Sergeeva Maria Effect of shield magnetization on variations in the frequency of onboard rubidium atomic clocks In the paper, the results of a study of the influence of the magnetic shield magnetization on the relative frequency instability of small-sized rubidium atomic clocks have been presented. The atomic clock was placed in a rotating magnetic field, simulating the magnetic situation in the orbit of a navigation satellite, moving in orbit and rotating around its own axis. The magnetization of the magnetic shield of the atomic clock was shown to increase its shielding factor. This result makes it possible to significantly reduce the influence of geomagnetic field variations on the frequency stability of onboard atomic clocks. 10.18721/JPM.17106 53.098 atomic clock magnetic field magnetic shield Allan deviation navigation satellite https://physmath.spbstu.ru/article/2024.71.6/ 06_56-63_17(1)2024.pdf

RAR RUS 64-70 0000-0001-5219-6744 Peter the Great St. Petersburg Polytechnic University Taradaev Evgeniy Sominski Gennadiy sominski@rphf.spbstu.ru 0000-0001-5548-7379 Peter the Great St. Petersburg Polytechnic University Taradaev Sergei Current and speed characteristics of electron flows formed by the electron-optical system with a multi-tip field emitter The article presents the results of studies of the characteristics of electron flows generated by an electron-optical system with a multi-tip field emitter. Information has been obtained on important beam parameters: the beam current, electron velocity spectrum, pitch factor. The spread in transverse velocity did not exceed 50 % in the studied modes. The shape of the spectra did not depend on the magnitude of the magnetic field and did only weakly on the current in the beam. 10.18721/JPM.17107 537.533 field emission multi-tip field emitter electron flow velocity spread https://physmath.spbstu.ru/article/2024.71.7/ 07_64-70_17(1)2024.pdf

RAR RUS 71-80 Peter the Great St. Petersburg Polytechnic University Zolotorevsky Nikolai zolotorevsky@phmf.spbstu.ru Peter the Great St. Petersburg Polytechnic University Rybin Valery rybinvv@mail.com

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

NRC "Kurchatov Institute" - CRISM "Prometey", Ushanova Elina elinaus@mail.ru Institute for Problems in Mechanical Engineering of RAS (the branch of Institute of Applied Physics of RAS) Perevezentsev Vladimir v.n.perevezentsev@gmail.com The scaling of misorientation angle distribution at strain-induced boundaries in copper deformed by tension under various conditions In the paper, polycrystalline copper deformed by tension under different conditions of loading has been studied using electron backscatter diffraction. The microstructure of areas located on the longitudinal section of the specimens deformed until fracture was examined. The fragmentation of initial grains in case of deformation at room temperature was observed whereas at 400°С, considerable dynamic recovery and recrystallization significantly influenced the microstructure formation. A procedure for computer analysis of the orientation maps has been put forward, which allows separating recrystallized regions from the non-recrystallized ones and further analyzing the misorientation statistics of strain-induced boundaries. A scaling behavior of the strain-induced misorientation distributions was shown to take place. The mechanism of strain-induced boundary evolution was proved to remain unchanged for all studied deformation conditions, in spite of recovery and recrystallization occurring at elevated temperatures. 10.18721/JPM.17108 548.4 polycrystalline copper plastic deformation recrystallization microstructure electron backscatter diffraction https://physmath.spbstu.ru/article/2024.71.8/ 08_71-80_17(1)2024.pdf

RAR RUS 81-92 0000-0003-4310-1189 Peter the Great St. Petersburg Polytechnic University Abramova Marina Peter the Great St. Petersburg Polytechnic University Malykh Anastasia anastasiyaa2s3d4f5g6@gmail.com Peter the Great St. Petersburg Polytechnic University Gatieva Iana yana.gatieva6@gmail.com 0000-0001-5640-8142 Peter the Great St. Petersburg Polytechnic University Kazalov Maksim 0000-0002-9562-1998 Peter the Great St. Petersburg Polytechnic University Selkova Polina 0000-0003-0462-1157 Peter the Great St. Petersburg Polytechnic University Yakimov Alexander 0000-0002-0070-4898 Vasileva Aleksandra 0000-0003-0901-4188 Peter the Great St. Petersburg Polytechnic University Arseniev Anatoly arsenievanatoly@gmail.com 0000-0003-0562-0156 Peter the Great St. Petersburg Polytechnic University Khodorkovskii Mikhail khodorkovskii@gmail.com An analysis of the Asgardarchaea Cas1_3 protein: Experimental characterization of a potential intermediate in the evolution of CRISPR-Cas systems The evolution of CRISPR-Cas systems and their possible origin from mobile genetic elements of transposons are currently being actively studied. Recently, unique systems have been discovered in a new group of Asgardarchaea that presumably function as transposons and contain Cas1-like proteins. In this study, the genetic and biochemical technologies were used, along with electrophoresis, affinity chromatography, and high-resolution mass spectrometry, to obtain and partially characterize a recombinant version of one of these proteins, Cas1_3. In particular, it was shown to have the ATPase activity, the quantitative value of the latter being determined by the spectrophotometric method. The results obtained may be useful in understanding the mechanisms of functioning the potential ancestor of CRISPR-Cas systems. 10.18721/JPM.17109 577.322 characterization CRISPR-Cas evolution intermediate form Asgardarchaea transposon recombinant protein https://physmath.spbstu.ru/article/2024.71.9/ 09_81-92_17(1)2024.pdf

RAR RUS 93-102 0000-0002-8910-4775 Peter the Great St. Petersburg Polytechnic University Lobanov Andrey lobanov2.aa@edu.spbstu.ru 0000-0003-0309-5917 Peter the Great St. Petersburg Polytechnic University Berdnikov Yaroslav berdnikov@spbstu.ru 0009-0005-7144-4746 Peter the Great St. Petersburg Polytechnic University Muzyaev Evgeniy muzyaev.ev@edu.spbstu.ru A generative adversarial network as the basis for a semi-inclusive deep inelastic lepton scattering generator on a polarized proton A neural network, that allows someone to obtain results for semi-inclusive deep inelastic scattering of charged leptons on polarized protons, with the production of pions or strange K mesons, has been developed in this study. The research covered both transverse and longitudinal polarizations of the proton. A range of initial energies of colliding particles was chosen from 20 to 100 GeV in a central mass system. The range is typical for electron-ion colliders currently being designed. It has been shown that it is possible to predict the physical characteristics of the final lepton and hadron with high accuracy as well as different variants of proton polarization using the proposed neural network. 10.18721/JPM.17110 539.12 semi-inclusive deep inelastic scattering asymmetries machine learning neural network generative-adversarial network https://physmath.spbstu.ru/article/2024.71.10/ 10_93-102_17(1)2024.pdf

RAR RUS 103-113 0000-0002-1722-1964 Peter the Great St. Petersburg Polytechnic University Kozlov Artemy kozlov_as@spbstu.ru 0000-0001-7083-9184 Peter the Great St. Petersburg Polytechnic University Medvedev Andrei medvedev@spbstu.ru 0000-0002-7901-3933 Motorin Evgenii 0000-0003-0213-5833 Peter the Great St. Petersburg Polytechnic University Savelyev Evgeny 0000-0003-2083-8989 Peter the Great St. Petersburg Polytechnic University Temkina Valentina temkina_vs@spbstu.ru Peter the Great St. Petersburg Polytechnic University Filippov Valery filippov_vn@spbstu.ru A picosecond fiber laser based on a tapered ytterbium fiber with the low birefringence This paper presents the results of the experimental study of a fiber laser connected according to the MOPA scheme, where a power amplifier was made of an ytterbium double-clad tapered spun fiber with low intrinsic birefringence. A peak output power of 160 kW with the average power of 160 W has been achieved at 1040 nm wavelength, 50 ps pulse duration and its repetition frequency of 20 MHz; the laser beam quality parameter and the mode-spot diameter being 1.15 and 35 μm, respectively. The values of azimuth, ellipticity and degree of polarization of the output radiation were found; their little sensitivity to the pump power was demonstrated. This research was the next important step in the development of high-power picosecond fiber lasers technology. 10.18721/JPM.17111 535.515 ytterbium spun tapered fiber picosecond fiber laser intrinsic birefringence https://physmath.spbstu.ru/article/2024.71.11/ 11_103-113_17(1)2024.pdf

RAR RUS 114-129 Institute for Problems of Mechanical Engineering, RAS Fedotov Aleksandr alvafed@yandex.ru

St. Petersburg, Russian Federation

A comparison of approaches to specifying the modal matrices in the modal control of elastic systems with and without observers The implementation of modal control of distributed elastic objects involves the use of modal matrices: a mode analyzer and a mode synthesizer specifying the linear transformation of vectors of measured and control signals in order to separate the eigenmodes of the object in the control system. The standard method for calculating the modal matrices is the inversion of the influence matrices. The article proposes an alternative method: transposing the influence matrices with normalization of the action on different modes. As an example, the problem of suppression of forced vibrations of a thin metal beam using piezoelectric sensors and actuators has been solved numerically, and different combinations of the above methods and different variants of normalization have been tested. Two types of control systems were considered, the former being based on modal and frequency filters and the latter being based on modal observers. The best control result was shown to be achieved with the combined use of the above methods for both types of control systems considered. 10.18721/JPM.17112 531.391+681.5 modal control modal matrices mode analyzer mode synthesizer observer https://physmath.spbstu.ru/article/2024.71.12/ 12_114-129_17(1)2024.pdf