2304-9782, 2618-8686, 2405-7223 4 182 2 2013

RAR RUS 9-29 0000-0002-2793-5717 Peter the Great St. Petersburg Polytechnic University Filimonov Alexey filimonov@rphf.spbstu.ru

St. Petersburg, Russian Federation

56962712400 Peter the Great St. Petersburg Polytechnic University Rudskoy Andrey rector@spbstu.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Ioffe Physical Technical Institute of the Russian Academy of Sciences Naberezhnov Alexander alex.nabereznov@mail.ioffe.ru AAD-9657-2019 57197390995 Peter the Great St. Petersburg Polytechnic University Fotiadi Alexander fotiadi@rphf.spbstu.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Ioffe Institute, RAS Koroleva Ekaterina e.yu.koroleva@mail.ioffe.ru Golosovsky Igor golosov@pnpi.spb.ru Kumzerov YuriA. Yu.Kumzerov@mail.ioffe.ru Nacke Bernhard nacke@etp.uni-hannover.de Nanocomposite materials on the base of dielectric porous matrices The correlations between physical properties and structure of various types of nanocomposite magnetic and ferroelectric materials on the basis of natural and artificial porous have been studied by different experimental methods. The temperature evolution of the structure, order parameter and dielectric response are studied as functions of characteristic size of nanoparticles. It is shown the existence of crossover of phase transition (PT) from the first order to the second one for ultra-small ferroelectric and magnetic particles. 538.913: 620.22 - 022.53 nanocomposites porous matrices neutron diffraction dielectric response https://physmath.spbstu.ru/article/2013.22.1/ ph_4_2_182_2013.9_29.pdf

RAR RUS 30-37 Wagner Friedrich fritz.wagner@ipp.mpg.de 0000-0002-4572-4120 Peter the Great St. Petersburg Polytechnic University Sergeev Vladimir v.sergeev@spbstu.ru Goncharov Pavel p.goncharov@spbstu.ru The research laboratory of the Physics of Advanced Tokamaks of the St. Petersburg State Polytechnical University Within the research laboratory of the Physics of advanced Tokamaks, which has been founded in 2011on the basis of a MEGA-Grant, the two groups from the university and the Ioffe Institute cooperate on the three tokamaks, Globus-m, Tuman-3m and fT-2. The research of both partners benefitted from the means of the MEGA-Grant. The laboratory has given itself a transparent governing structure and its annual outcome is assessed by an international advisory committee. a graduate school has been founded to ensureproper education. The laboratory could serve as a model for integrated research and education centre in Russian thermonuclear program. The urgent need to modernize the Russian fusion devices has become obvious. 533.9 research laboratory thermo-nuclear fusion tokamak devices plasma confinement plasma diagnostics plasma heating theory and experiment education within RLPAT https://physmath.spbstu.ru/article/2013.22.2/ ph_4_2_182_2013.30_37.pdf

RAR RUS 38-46 0000-0002-6402-8112 Peter the Great St. Petersburg Polytechnic University Louksha Oleg louksha@rphf.spbstu.ru Sominski Gennadiy sominski@rphf.spbstu.ru 0000-0002-3321-7797 Peter the Great St. Petersburg Polytechnic University Arkhipov Alexander arkhipov@rphf.spbstu.ru Dvoretskaya Nataliya nat@rphf.spbstu.ru Samsonov Dmitry dima_samsonov@bk.ru Syomin Sergey starosta2094@mail.ru Wagner Friedrich fritz.wagner@ipp.mpg.de Gyrotron research at the St. Petersburg State Polytechnical University This paper presents the results of investigations performed by the researchers of the department of Physical electronics in the laboratory headed by Prof. F. Wagner and supported by the ministry of education and science of the Russian Federation on the basis of MEGA-Grant. Methods for the improvement of helical electron beam quality and for enhancement of gyrotron efficiency, new gyrotron electron beam diagnostics are discussed. 621.38 gyrotron efficiency helical electron beam diagnostics St.Petersburg state polytechnical university departament of physical electronics https://physmath.spbstu.ru/article/2013.22.3/ ph_4_2_182_2013.38_46.pdf

RAR RUS 47-56 Artamonov Dmitry artdmitrii@gmail.com Korzhova Victoria viktoria.korzhova@gmail.com Peter the Great St. Petersburg Polytechnic University Vlasova Olga olvlasova@yandex.ru O-7971-2016 7006214225 0000-0001-7006-6951 UT Southwestern Med Ctr, Dept Physiol Bezprozvanny Ilya mnlabspb@gmail.com

Dallas, USA

Optogenetic approach allows controlling morphological parameters of dendritic spines in cortico-striatal co-culture Optogenetics is a unique technique that allows controlling the physiological condition within single cellor specific cell population, including controlling individual neuron activity. In the present work optogenetics has been applied to control the morphology and density of synaptic connections between striatal and cortical neurons in mixed cortico-striatal co-culture system. Different methods for visualization of medium spiny neurons dendritic spines have been compared. Studying synaptic dysfunction is necessary for understanding both normal physiology of brain and pathological mechanisms in different neurodegenerative diseases. The described approach could be utilized in a numerous biomedical applications. 53.047 optogenetics dendritic spines synaptic transmission neuronal culture https://physmath.spbstu.ru/article/2013.22.4/ ph_4_2_182_2013.47_56.pdf

RAR RUS 57-65 Gerchikov Leonid lgerchikov@rambler.ru Electron-ion scattering and plasmon damping in metallic clusters Processes of electron scattering on fine ionic structure leading to the decay of dipole plasmon oscillations in alkali metal clusters are investigated. The study is based on separation of the collective plasmon oscillations and single particle excitations. Coupling between these two types of electronic motions caused by electron-ion scattering leads to the plasmon damping. The relative contributions of elastic and inelastic electron-ion scattering to plasmon linewidth are considered. The results are compared with experimental data on cluster photoabsorption for sodium clusters of different size. 538.915 cluster plasmon scattering oscillation excitation damping https://physmath.spbstu.ru/article/2013.22.5/ 05.57_65.pdf

RAR RUS 66-75 Gerchikov Leonid lgerchikov@rambler.ru Mamaev Yuri mamaev@spes.stu.neva.ru Yashin Yuri Kuz’michev Vitaly Aulenbacher Kurt aulenbac@kph.uni-mainz.de Riehn Erich Electronic transport in strained AlInGaAs/AlGaAs superlattices Transport of spin polarized electrons in semiconductor alingaas/algaas superlattices (sl) with strained quantum wells used for photoemitter application is studied. The experimental study is based on the time resolved measurements of electron emission from the cathode after its photoexcitation by fs laser pulse. We report the variation of the sl response time with the number of superlattice periods. We have also performed theoretical calculations of photocathode pulse response and compared the obtained results with experimental data. Our analysis testifies the presence of partial electron localization in sl. We demonstrate that electron localization suppresses electronic transport and strongly limits the cathode quantum efficiency. 538.915 superlattice dfiffusion photoemission electronic transport https://physmath.spbstu.ru/article/2013.22.6/ 06.66_75.pdf

RAR RUS 76-83 Zakharkin Maxim maxim.zakh@gmail.com Okuneva Nina nina.okuneva@mail.ioffe.ru Vergentev Tikhon tikhon.v@gmail.com Banshchikov Alexander aban88@bk.ru Ioffe Institute, RAS Koroleva Ekaterina e.yu.koroleva@mail.ioffe.ru Sokolov Nikolai nsokolov@fl.ioffe.ru In-plane conductivity of thin films and heterostuctures based on LaF3-SrF2 The in-plane conductivity of solid solution la1-xsrxf3-x (x = 0 ÷ 0.24) films with thicknesses from 40 to 260 nm grown on glass-ceramics based on sio2, al2o3, caf2 (111) and mgo (100) substrates, and laf3-srf2 heterostructures grown on mgo (100) substrates were studied by impedance spectroscopy at temperature range from room temperature to 300 °c and at frequencies from 10-1 to 106 hz. It was found that there was a maximum of ionic conductivity for la1-xsrxf3-x (x = 0 ÷ 0.24) solid solution films at x ≈ 0.05. The conductivity of la0.95sr0.05f2.95 films is by 2 - 4 orders of magnitude higher than that of pure lanthanum fluoride films on the substrates of magnesium oxide, sapphire and glass-ceramics. It was also shown that there was a maximum of in-plane conductivity of laf3-srf2 heterostructures for the thickness of each layer ~ 20 nm. The activation energy was evaluated from the temperature dependencies of the dc-conductivity of the films according to Arrhenius - Frenkel law. It was 400 - 800 mev for all measured samples. 538.9 solid solution tysonite lanthanum fluoride strontium fluoride impedance in-plane conductivity https://physmath.spbstu.ru/article/2013.22.7/ 07.76_83.pdf

RAR RUS 84-89 Lukianov Sergey serjluk4@gmail.com Andreeva Nataliya 0000-0002-2793-5717 Peter the Great St. Petersburg Polytechnic University Filimonov Alexey filimonov@rphf.spbstu.ru

St. Petersburg, Russian Federation

Wurz Mark Rissing Lutz Surface polar nanoregions structure of potassium tantalate doped with lithium obtained at cryogenic temperatures using piezoresponse force microscopy technique In the present work we have used a piezoresponse force microscopy (Pfm) technique for the studyof the polar surface structure of potassium tantalate single crystal doped with li+ ions (KlT-3 %) at low temperatures. The results of our measurements confirmed the existence of polar nanoregions in the temperature range of 10 - 80 K. We obtained a temperature evolution of the nanoregions and estimated theirdimensions. Resolving polar nanoregions structure of KlT-3% crystal in zero-field heating after zero-field cooling regime could indicate the existence of ferroelectric phase transition in this material. 538.975: 620.22 - 022.53 relaxors potassium tantalate doped with lithium low temperature piezoresponse force microscopy https://physmath.spbstu.ru/article/2013.22.8/ 08.84_89.pdf

RAR RUS 90-93 Lushin Evgeny lushin.ev@gmail.com Herzen State Pedagogical University of Russia Castro Arata Rene recastro@mail.ru Determination of the glass transition temperature in polymer composites and systems The results of the study of the frequency dependence of the dielectric constant in a wide range of tem-perature in tetrazole polymers are presented. It has been found that the temperature at which the dielectric constant changes sharply in all systems is the glass transition temperature. 536.421 tetrazole polymers glass transition temperature dielectric relaxation https://physmath.spbstu.ru/article/2013.22.9/ 09.90_93.pdf

RAR RUS 94-100 Ilinskiy Alexander ilinskiy@mail.ioffe.ru Herzen State Pedagogical University of Russia Castro Arata Rene recastro@mail.ru Nabiullina Lilia Peter the Great St. Petersburg Polytechnic University Pashkevich Marina marpash@yandex.ru Shadrin Evgeniy shadr.solid@mail.ioffe.ru Dielectric spectroscopy as means of diagnostics of electronic states of sillenites The physical parameters of impurity centers of Bi[12]SiO[20] crystals have been determined by the dielectric spectroscopy method. 537.632.3 dielectric spectroscopy sillenites thermo-stimulated currents https://physmath.spbstu.ru/article/2013.22.10/ 10.94_100.pdf

RAR RUS 101-108 Stepanova Tamara t_stepanova2005@mail.ru Anan’eva Tatiana anthracene@hq.macro.ru Karpenko Elena ele62461401@yandex.ru E-4237-2014 12784708700 0000-0001-9050-4453 Peter the Great St. Petersburg Polytechnic University Kapralova Victoria kapralova2006@yandex.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

A dipole moment and conformations of poly-N-vinylpyrrolidone and of its complex with C60 fullerene in aqueous solutions The study of temperature dependences of dipole moments and conformational properties of poly-n-vinylpyrrolidone (PVP) and polymer complex of PVP with c60 fullerene (PVP + fc60) was carried out in dilute aqueous solutions at 293-313 K. It was shown that dipole moment values for PVP and PVP + fc60 were 24-32 d and 18 d, correspondingly. The presence of the molecular group -n-c=o in each monomer unit near the macromolecule backbone promotes the formation of helical blocks in macromolecular coils. In external electric field, the non-alternating projections on the direction of this field and on the vectors connecting the neighboring segments of the macromolecule appear. It was demonstrated that the changes in the characteristics of the dielectric polarization could be explained by structuring in the coils of PVP and PVP + fc60 in aqueous solutions. 537.226:544.163.2 dielectric permittivity dipole moment helical blocks in coils association solution https://physmath.spbstu.ru/article/2013.22.11/ 11.101_108.pdf

RAR RUS 109-114 Vorobjev Leonid J-6066-2013 35403302800 0000-0003-3947-4994 Peter the Great St. Petersburg Polytechnic University Firsov Dmitry firsov.da@spbstu.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Peter the Great St. Petersburg Polytechnic University Panevin Vadim pvyu@rphf.spbstu.ru Sofronov Anton sofronov@rphf.spbstu.ru Balagula Roman National Research University ‘Higher School of Economics” Makhov Ivan imahov@hse.ru Near- and far-infrared emission from GaAs/AlGaAs quantum wells under interband optical excitation The results of experimental studies of low-temperature impurity-assisted photoluminescence of n-dopedGaas/alGaas quantum well structures both in near- and far-infrared (terahertz) spectral ranges under interband optical excitation are presented. In the near-infrared photoluminescence spectra the opticalelectron transitions from the donor ground state to the hole subband are revealed. The depopulation of the impurity ground states due to these transitions allowed us to observe photoluminescence in terahertz spectralrange related to electron transitions from the first electron subband to the donor state as well as to intracenteroptical transitions. Experimental results in near- and far-infrared spectral ranges are well-consistent with the results on terahertz photoconductivity and theoretical calculations. 538.958 impurities quantum wells terahertz radiation photoluminescence https://physmath.spbstu.ru/article/2013.22.12/ 12.109_114.pdf

RAR RUS 115-122 Shubina Ekaterina katerinashubina@gmail.com P-6861-2015 10041592700 https://orcid.org/0000-0003-2511-0188 Karaseov Platon platon.karaseov@spbstu.ru Mishin Maxim maximvmishin@gmail.com, mmishin@spbstu.ru Protopopova Vera vera_protopopova@mail.ru Vinogradov Andrei Karaseov Nikita 0000-0002-3321-7797 Peter the Great St. Petersburg Polytechnic University Arkhipov Alexander arkhipov@rphf.spbstu.ru Shahmin Alexander alshakhmin@yandex.ru Podsvirov Oleg 0000-0003-4933-9534 Peter the Great St. Petersburg Polytechnic University Titov Andrey andrei.titov@rphf.spbstu.ru Effect of temperature on properties of DLC films and DLC-Ni:C sandwich growth A possibility of formation of sandwich structures comprising of both DLC and nano-crystalline Ni-Carbon films on silicon substrate is presented. The influence of DLC film exposition to high temperature during preparation of Ni:C layers on its properties has been investigated by means of isochronal thermal annealing in carrying gas used. All structures obtained were examined by atomic force microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. It has been established that annealing leads to decrease of the internal residual stress in the DLC films as well as causes swelling of samples with temperature rise.The fraction of sp{3} hybridized bonds increases and the sp{2} fraction symmetrically decreases with increase of annealing temperature. The different sequences of growth processes to obtain DLC-Ni:c-DLC sandwich structure were investigated. The best way to get good structure quality is to grow initial DLC film at 200 V and 100 W and Ni:C layer at 500 °c. 538.951:53.097 diamond-like carbon DLC nanocrystalline nickel thermal annealing internal residual stress sandwich structure https://physmath.spbstu.ru/article/2013.22.13/ 13.115_122.pdf

RAR RUS 123-128 0000-0002-3321-7797 Peter the Great St. Petersburg Polytechnic University Arkhipov Alexander arkhipov@rphf.spbstu.ru Krel Stanislav 8svyatoslav8@mail.ru Mishin Maxim maximvmishin@gmail.com, mmishin@spbstu.ru Uvarov Andrey uvarov.andrew@gmail.com Сorrelations in field electron emission current from local spots at nanoporous carbon films Heterogeneous nanocarbon materials including both diamond and graphite phase domains demonstrate enhanced efficiency of electron emission that often remains unexplained by theory. Characteristic features of the actual mechanism of facilitated emission were searched for via position-resolved investigation of emission current fluctuations. The reported studies were performed with nanoporous carbon chemically derived fromsic. Partially ordered and spatially correlated character of fluctuations observed in the experiment allows to presume involvement of self-sustaining non-stationary electric field as a possible factor of emission enhancement. 537.533.2 field-induced electron emission nanoporous carbon correlation analysis https://physmath.spbstu.ru/article/2013.22.14/ 14.123_128.pdf

RAR RUS 129-135 0000-0003-4292-0959 Peter the Great St. Petersburg Polytechnic University Golovitski Alexander alexandergolovitski@yahoo.com Electron energy relaxation length in connection with the problem of electron energy distribution locality in glow discharge plasma in a xenon-chlorine mixture The analytic calculations of relaxation length of electron energy based on a probabilistic approachand numerical calculations of nonlocality effect on the plasma-chemical processes rates have been carriedout for plasma of an electronegative glow discharge in a mixture of xenon and chlorine. It is shown, that for total pressure higher than 6 Torr and with amount of chlorine more than 1/25 the effect of electronenergy distribution nonlocality is negligibly small and the local approach can be used for modeling such discharges. 533.9=111 gas discharge energy relaxation electronegative gases energy distribution locality https://physmath.spbstu.ru/article/2013.22.15/ 15.129_135.pdf

RAR RUS 136-141 Sominski Gennadiy sominski@rphf.spbstu.ru Sezonov Vyacheslav sezonovve@mail.ru 0000-0001-5219-6744 Peter the Great St. Petersburg Polytechnic University Taradaev Evgeniy Tumareva Tatiana tumareva@rphf.spbstu.ru Givargizov Evgeny egivargiz@ns.crys.ras.ru Stepanova Alla cvdlab@ns.crys.ras.ru Cold field emitters for electron devices operating in technical vacuum The paper describes the field emitters of a new type: multi-tip cathodes with special protective coatings and layered cathodes prepared from the nano-layers of the materials with different work function values.The article presents data on the technology of emitter creation and their operation at technical vacuum conditions. 537.5 field emitter high emission currents high durability in technical vacuum experiment numerical computation https://physmath.spbstu.ru/article/2013.22.16/ 16.136_141.pdf

RAR RUS 142-147 Kniazkov Anatoly akniazkov@mail.ru The polarization-optical method for spectral analysis of light An analysis of passing the light emission that has Gaussian spectrum through the polarization-optical scheme (POS) with half-wave phase plate has been performed. The results of theoretical calculations of the coherence length of the radiation as a function of the contrast of POS output intensities are obtained for the different widths ∆λ of the Gaussian emission spectrum. The research results of the contrast of POS with λ/2 phase plate are obtained for the following case: high-power leds radiation of red, green and blue spectrum; semiconductor laser red wavelengths; a second harmonic ND-laser (green wavelength range). 535:621.373.8:6 polarize-optical method half-wave plate spectral analysis contrast modulation https://physmath.spbstu.ru/article/2013.22.17/ 17.142_147.pdf

RAR RUS 148-153 7006335646 Peter the Great St. Petersburg Polytechnic University Privalov Vadim kafedra@physics.spbstu.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Seteikin Alexey AAD-9657-2019 57197390995 Peter the Great St. Petersburg Polytechnic University Fotiadi Alexander fotiadi@rphf.spbstu.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Simulation of laser radiation propagation in inhomogeneous media with complex geometry A mathematical model has been developed. It makes possible to analyze the process of the threedimensional propagation of laser radiation in inhomogeneous media with a complex geometry using the proposed modification of the Monte Carlo method. The model also allows to carry out the calculation of the distribution of the absorbed laser energy density in multilayered materials with complex geometry and can be used in solving problems of analysis of thermal fields visualization. Those problems arise in irradiated tissues. 57+615.47+621.373.8+535.8 laser radiation multibiological tissue Monte Carlo method ingomogeneity multiple scattering. https://physmath.spbstu.ru/article/2013.22.18/

RAR RUS 154-163 0000-0003-1457-8236 Peter the Great St. Petersburg Polytechnic University Ipatov Andrey andrei_ipatov@mail.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

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

Polozkov Roman polozkov@tuexph.stu.neva.ru On stability of nanoscale electron-positron droplets This paper presents the results of the total energy calculation for electroneutral electron-positron clusters with closed shells. The calculations were performed within the random Phase approximation with exchange to take into account many-particle correlations that allowed us to reduce the energy per one electron-positron pair below the energy per one pair of dipositronium molecule. The most stable electron-positron clusters are found for the cluster sizes in the interval from 20 to 40 pairs. 536.421 cluster electron positron nanoscale droplet RPAE https://physmath.spbstu.ru/article/2013.22.19/ 19.154_163.pdf

RAR RUS 164-170 Novikov Evgeny novikov@icm.krasn.ru A second-order method for additive stiff problem A second-order accuracy method for additive stiff systems of ordinary differential equations is developed. Inequalities for accuracy control are obtained. Numerical results are presented. 519.622 stiff additive problem (M,K)-method error estimation https://physmath.spbstu.ru/article/2013.22.20/ 20.164_170.pdf