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Microwave diagnost.cs of pulsed atmospheric discharge with electrolytic electrode and long-lived luminous formation in its afterglow

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High Voltage 2024年第1期9卷 127-136页

作者： Shixin Zhao Xingbao Lyu Aleksandr Ast.fiev Chengxun Yuan Lin Miao Jingfeng Yao Ying Wang Anatoly Kudryavtsev Aleksandr Chirtsov Gennadii Shabanov Zhongxiang Zhou School of physics Harbin Institute of TechnologyHarbinChina physics.Department Saint Petersburg Electrotechnical University“LETI”St.PetersburgRussia Heilongjiang Provincial Key Laboratory of Plasma physics.and Application Technology HarbinChina physics.Department St.Petersburg State UniversitySt.PetersburgRussia Konst.ntinov petersburg.Nuclear physics.institute National Research Centre“Kurchatov Institute”GatchinaRussia

The Gatchina discharge phenomenon holds significant promise as a laboratory model for simulating ball ***,crucial aspects concerning the plasma components of the resulting afterglow remain ***,the measurement of the electron density,a critical parameter,has not been fully achieved thus *** this st.dy,microwave diagnost.cs and video recording were employed during a pulsed Gatchina discharge,along with synchronous measurement of discharge current and *** antennas were positioned at different heights to enable separate diagnosis of the discharge and the ensuing long-lived *** findings revealed that during the active phase of the Gatchina discharge,the plasma density was subst.ntial enough to cause reflection of an electromagnetic wave with a frequency of 20 GHz from this highly conductive *** the afterglow,the signal experienced only a moderate weakening of 10–20 percent,facilitating the determination of the time dependence of average electron density during the afterglow's passage between the two *** measurements verified the unusually slow plasma decay in the afterglow of the Gatchina discharge,suggest.ng the potential significance of chemi-ionisation processes involving long-lived(metast.ble)particles.

关键词： holds luminous electrolytic

Radiation of a TM mode from an open end of a three-layer dielectric capillary

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Chinese physics.B 2024年第7期33卷 311-318页

作者： Sergey NGalyamin Alexandr MAltmark st.petersburg.st.te University 7/9Universitetskayanab.St.Petersburg 199034Russia st.petersburg.Electrotechnical University“LETI” 5ProfessoraPopovaSt.Petersburg 197022Russia

Modern trends in beam-driven radiation sources include the interaction of Cherenkov wakefields in open-ended circular waveguides with complicated dielectric linings, with a three-layer dielectric capillary recently proposed to reduce radiation divergence being a representative example [Opt. Lett. 45 5416(2020)]. We present a rigorous approach that allows for an analytical description of the electromagnetic processes that occur when the st.ucture is excited by a single waveguide TM mode. In other words, the corresponding canonical waveguide diffraction problem is solved in a rigorous formulation. This is a continuation of our previous papers which considered simpler cases with a homogeneous or two-layer dielectric filling. Here we use the same analytical approach based on the Wiener–Hopf–Fock technique and deal with the more complicated case of a three-layer dielectric lining. Using the obtained rigorous solution, we discuss the possibility of manipulating the far-field radiation pattern using a third layer made of a low permittivity material.

关键词： diffraction radiation open-ended waveguide Wiener–Hopf technique Cherenkov radiation

Hetero-integrated high-peak-optical-power laser source (940 nm) for time-of-flight sensors

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Chinese Optics Letters 2024年第7期22卷 81-85页

作者： Sergey Olegovich Slipchenko Aleksandr Aleksandrovich Podoskin Ilia Vasil'evich Shushkanov Marina Gennad'evna Rast.gaeva Artem Eduardovich Rizaev Matvey Igorevich Kondratov Artem Evgen'evich Grishin Nikita Aleksandrovich Pikhtin Timur Anatol'evich Bagaev Maxim Anatol'evich Ladugin Aleksandr Anatol'evich Marmalyuk Vladimir Aleksandrovich Simakov ioffe Inst.tut Russian Academy of SciencesSt.Petersburg 194021Russia Open Joint-st.ck Company M.F.st.l’makh Polyus Research institute Moscow 117342Russia RUDN University Moscow 117198Russia

The generation of high-power laser pulses using a compact hetero-integrated assembly based on a semiconductor laser with a dual-element composite 2μm×100μm aperture and a compact heterothyrist.r switch is *** achieved peak optical power was 33 W with a pulse duration of 3 ns at a thyrist.r operating voltage of 55 *** leading edge of the laser pulse turn-on was 50 ps to a power level of 24.7 W,and the turn-on delay between the elements of the composite aperture was 160 ps.

关键词： hetero-integrated assembly semiconductor lasers thyrist.r switches LIDAR gain-switching mode laser heterost.ucture

Cross-method Analysis of Corotation Radii Data Set for Spiral Galaxies

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Research in Ast.onomy and Ast.ophysics 2024年第7期24卷 95-110页

作者： V.S.Kost.uk A.A.Marchuk A.S.Gusev st.rnberg Ast.onomical institute Lomonosov Moscow State UniversityUniversitetsky pr.13119234 MoscowRussia Central(Pulkovo)Ast.onomical Observatory Russian Academy of SciencesPulkovskoye chaussee 65/1196140 St.PetersburgRussia Saint petersburg.st.te University Universitetsky pr.28198504 St.PetersburgRussia

A corotation radius is a key characterist.c of disk galaxies that is essential to determine the angular speed of the spiral st.uctureΩ_p,and therefore underst.nd its *** the literature,there are plenty of methods to est.mate this value,but do these measurements have any consist.ncy?In this work,we collected a data set of corotation radius measurements for 547 galaxies,300 of which had at least.two *** initial analysis reveals that most.objects have rather inconsist.nt corotation radius ***,a significant fraction of galactic disks is dist.nguished by a large error coverage and almost.uniform dist.ibution of *** findings do not have any relation to spiral type,Hubble classification,or presence of a *** other reasons,obtained results could be explained by the transient nature of spirals in a considerable part of *** have made our collected data sample publicly available,and have demonst.ated on one example how it could be useful for future research by invest.gating a winding time value for a sample of galaxies with possible multiple spiral arm patterns.

关键词： galaxies fundamental parameters-galaxies kinematics and dynamics-galaxies st.ucture

High-speed performance self-powered short wave ultraviolet radiation detectors based onκ(ε)-Ga_(2)O_(3)

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Journal of Semiconductors 2024年第4期45卷 56-62页

作者： Aleksei Almaev Alexander Tsymbalov Bogdan Kushnarev Vladimir Nikolaev Alexei Pechnikov Mikhail Scheglov Andrei Chikiryaka Petr Korusenko Research and Development Center for Advanced Technologies in Microelectronics National Research Tomsk State UniversityTomsk 634050Russia Fokon LLC Kaluga 248035Russia Department of Semiconductor Electronics and physics.of Semiconductors National University of Science and Technology MISISMoscow 119049Russia Perfect Cryst.ls LLC Saint Petersburg 194223Russia Department of Solid-st.te Electronics Saint Petersburg State UniversitySaint Petersburg 199034Russia Department of physics Omsk State Technical UniversityOmsk 644050Russia

High-speed solar-blind short wavelength ultraviolet radiation detectors based onκ(ε)-Ga_(2)O_(3)layers with Pt contacts were demonst.ated and their properties were st.died in ***κ(ε)-Ga_(2)O_(3)layers were deposited by the halide vapor phase epitaxy on patterned GaN templates with sapphire *** spectral dependencies of the photoelectric properties of st.uc-tures were analyzed in the wavelength interval 200-370 *** maximum photo to dark current ratio,responsivity,detectiv-ity and external quantum efficiency of st.uctures were determined as:180.86 ***.,3.57 A/W,1.78×10^(12) Hz^(0.5)∙cm·W^(-1) and 2193.6%,respectively,at a wavelength of 200 nm and an applied voltage of 1 *** enhancement of the photoresponse was caused by the decrease in the Schottky barrier at the Pt/κ(ε)-Ga_(2)O_(3)interface under ultraviolet *** detectors demon-st.ated could functionalize in self-powered mode due to built-in electric field at the Pt/κ(ε)-Ga_(2)O_(3)*** responsivity and external quantum efficiency of the st.uctures at a wavelength of 254 nm and zero applied voltage were 0.9 mA/W and 0.46%,*** rise and decay times in self-powered mode did not exceed 100 ms.

关键词： κ(ε)-gallium oxide solar-blind shortwave ultraviolet radiation detectors self-powered operation mode

Peculiarities of Ethylene Polymerization Reactions with Bis(imino)pyridyl Complexes of CoCl_(2) and FeCl_(2)

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Chinese Journal of Polymer Science 2024年第4期42卷 492-500页

作者： Laura A.Rishina Yury V.Kissin Svetlana S.Lalayan Artem A.Antonov Vadim G.Krasheninnikov Alexander A.Gulin N.N.Semenov Federal Research Center for Chemical physics Russian Academy of Sciences4 Kosygin St.Moscow119991Russia Department of Chemist.y and Chemical Biology RutgersThe State University of New Jersey123 Bevier Rd.PiscatawayNJ08854USA Boreskov institute of Catalysis Russian Academy of Sciences5 Lavrentieva Prosp.Novosibirsk630090Russia

The article describes ethylene polymerization reactions with transition metal catalyst. based on complexes of CoCl_(2) and FeCl_(2) with an N,N,N-tridentate ligand 2,6-bis[1-(2,6-dimethylphenylimino)ethyl]pyridine. The complexes are converted into polymerization catalyst. by reacting them either with polymethylalumoxane (MAO) or with a combination of Al(C2H5)2Cl and Mg(C4H9)2 at an [Al]:[Mg] ratio of ~3. Both MAO-activated complexes readily polymerize ethylene at 35 ℃ with the formation of linear, low molecular weight polymers with a narrow molecular weight dist.ibution. The same complexes, when activated with the Al(C2H5)2Cl-Mg(C4H9)2 combination, form multi-center catalyst. and generate polyethylenes with a broad molecular weight dist.ibution.

关键词： Ethylene polymerization Bis(imino)pyridyl complexes of CoCl_(2)and FeCl_(2) Molecular-weight dist.ibution Polymer chain st.ucture

Holographic dark energy in non-conserved gravity theory

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Communications in Theoretical physics 2024年第4期76卷 126-133页

作者： H R Fazlollahi institute of Gravitation and Cosmology Peoples Friendship University of Russia(RUDN University)6 Miklukho-Maklaya StMoscow117198Russia

Recently, reconsidering the Rast.ll idea T_(μ;νν)^(v)=α_(,μ) through relativist.c thermodynamics gives a new form for the scalar field α which led us to const.uct modern modified theory of gravity debugged ‘non-conserved gravity theory’ Fazlollahi 2023 Euro. Phys. J. C 83 923. This theory unlike other modified theories of gravity cannot directly explain the current acceleration expansion in the absence of the cosmological const.nt and or exist.nce of other forms of dark energy. Hence, in this st.dy we have reinvest.gated holographic dark energy Ρ_(X)~H^(2) in the non-conserved theory of gravity. In this context, the density and pressure of dark energy depend on the non-conserved term and density of the dust.matter field. As shown, due to non-conservation effects on large-scale st.uctures, unlike the original holographic model, our model onsets an acceleration epoch for the current Universe satisfies observations. Moreover, the interaction and viscous scenarios are st.died for this model.

关键词： non-conserved gravity covariant form of thermodynamics holographic dark energy

Technological parameters of thin-film pulsed laser scribing for perovskite photovoltaics

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Clean Energy 2024年第3期8卷 127-135页

作者： Rust.m Ishteev Pavel Gost.shchev Mariia Tiukhova Anton Sorokin Arthur Ishteev Vladimir Kondratenko Laboratory of Precision Machining of Materials Department of NanoelectronicsInstitute for Advanced Technologies and Industrial ProgrammingRTU MIREAMoscowRussia Research and Practical Clinical Center for Diagnost.cs and Telemedicine Technologies of the Moscow Health Care Department MoscowRussia Laboratory of Advanced Solar Energy(LASE) National University of Science and Technology MISIS4 Leninsky St.MoscowRussia Semenov Federal Research Center of Chemical physics Russian Academy of Sciences(RAS)4 Kosygina str.MoscowRussia

Over the past.decade,the power conversion efficiency of halide perovskite solar cells has shown a rapid increase to 26.1%.The significant efficiency growth and the relative simplification of the technology for obtaining thin-film solar cells due to liquid printing methods determine the high potential for the low-cost.perovskite solar cells ***,efficient use of cell geometry is comparable to the size of st.ndard cryst.lline-Si wafers(156:156 mm and more).Therefore,modular geometry similar to amorphous-Si solar cell approaches is used to scale perovskite solar *** electrical connection of thin-film cells requires precise processing of the conductive layers that form the device p-i-n *** subject of research is the development of a full pulsed laser scribing cycle for inverted perovskite solar *** this work,we propose a st.dy of a laser-patterning technology In_(2)O_(3):SnO_(2)(ITO)conductive layer and a photoactive perovskite layer Cs0,2(CH(NH_(2))_(2))_(0,8)PbI_(3).Process regimes of transparent conducting electrodes based on ITO and halide perovskite layer Cs_(0,2)(CH(NH_(2))_(2))_(0,8)PbI_(3)laser patterning were *** optimal parameters for the multipass mode processing of ITO and perovskite layer were *** cell was electrically isolated at a scribe line width of 30μm.

关键词： patterning perovskite solar cell perovskite solar cell photovoltaics scribing

Isochrone Fitting of Galactic Globular Clust.rs—Ⅵ.High-latitude Clust.rs NGC 5024 (M53),NGC 5053,NGC 5272 (M3),NGC 5466,and NGC7099 (M30)

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Research in Ast.onomy and Ast.ophysics 2024年第6期24卷 170-190页

作者： G.A.Gontcharov S.S.Savchenko A.A.Marchuk C.J.Bonatto O.S.Ryutina M.Yu.Khovritchev V.B.Il'in A.V.Mosenkov D.M.Poliakov A.A.Smirnov Central(Pulkovo)Ast.onomical Observatory Russian Academy of SciencesPulkovskoye chaussee 65/1St.Petersburg 196140Russia Saint petersburg.st.te University Universitetskij pr.28St.Petersburg 198504Russia Special Ast.ophysical Observatory Russian Academy of Sciences369167 Nizhnij ArkhyzRussia Departamento de Ast.onomia Instituto de FísicaUFRGSAv.Bento Gonçalves9500Porto AlegreRSBrazil Saint petersburg.University of Aerospace Inst.umentation Bol.Morskaya ul.67ASt.Petersburg 190000Russia Department of physics.and Ast.onomy Brigham Young UniversityN283 ESCProvoUT 84602USA

We fit various color–magnitude diagrams(CMDs) of the high-latitude Galactic globular clust.rs NGC 5024(M53),NGC 5053,NGC 5272(M3),NGC 5466,and NGC 7099(M30) by isochrones from the Dartmouth st.llar Evolution Database and Bag of st.llar Tracks and Isochrones for α–enrichment [α/Fe] = +*** the CMDs,we use data sets from Hubble Space Telescope,Gaia,and other sources utilizing,at least.25 photometric filters for each *** obtain the following characterist.cs with their st.tist.cal uncertainties for NGC 5024,NGC 5053,NGC 5272,NGC 5466,and NGC 7099,respectively:metallicities [Fe/H] =-1.93 ± 0.02,-2.08 ± 0.03,-1.60 ± 0.02,-1.95 ± 0.02,and-2.07 ± 0.04 dex with their syst.matic uncertainty 0.1 dex;ages 13.00 ± 0.11,12.70 ± 0.11,11.63 ± 0.07,12.15 ± 0.11,and 12.80 ± 0.17 Gyr with their syst.matic uncertainty 0.8 Gyr;dist.nces(syst.matic uncertainty added) 18.22 ± 0.06 ± 0.60,16.99 ± 0.06 ± 0.56,10.08 ± 0.04 ± 0.33,15.59 ±0.03 ± 0.51,and 8.29 ± 0.03 ± 0.27 kpc;reddenings E(B-V) = 0.023 ± 0.004,0.017 ± 0.004,0.023 ± 0.004,0.023 ± 0.003,and 0.045 ± 0.002 mag with their syst.matic uncertainty 0.01 mag;extinctions AV= 0.08 ± 0.01,0.06 ± 0.01,0.08 ± 0.01,0.08 ± 0.01,and 0.16 ± 0.01 mag with their syst.matic uncertainty 0.03 mag,which suggest.the total Galactic extinction AV= 0.08 across the whole Galactic dust.to extragalactic objects at the North Galactic *** horizontal branch morphology difference of these clust.rs is explained by their different metallicity,age,mass-loss efficiency,and loss of low-mass members in the evolution of the core-collapse clust.r NGC 7099 and loose clust.rs NGC 5053 and NGC 5466.

关键词： (st.rs:)Hertzsprung Russell and C-M diagrams (ISM:)dust extinction (Galaxy:)globular clust.rs:general (Galaxy:)globular clust.rs:individual(NGC 5024,NGC 5053,NGC 5272,NGC 5466,NGC7099)