Doklady Physics最新文献_第5页

Vector S-Parametric Analysis of Signal Phase Dynamic Radio Images 信号相位动态无线电图像的矢量 S 参数分析

IF 0.6 4区物理与天体物理

Doklady Physics Pub Date : 2024-02-15 DOI: 10.1134/S1028335823090057

S. S. Shadinov, M. S. Kostin, G. V. Konyashkin, A. S. Korchagin, M. Yu. Romanovsky, N. G. Guseyn-zade

{"title":"Vector S-Parametric Analysis of Signal Phase Dynamic Radio Images","authors":"S. S. Shadinov, M. S. Kostin, G. V. Konyashkin, A. S. Korchagin, M. Yu. Romanovsky, N. G. Guseyn-zade","doi":"10.1134/S1028335823090057","DOIUrl":"10.1134/S1028335823090057","url":null,"abstract":"A vector method for recording phase-dynamic radio images is proposed by forming and numerically analyzing the S-parametric scattering matrix of multidisciplinary signatures of material media and objects. The key advantages of aperture capture of signal radio images by the method of a frequency-synthesized power spectral density function of a scattered wave radio profile are determined. On the basis of a vector analyzer of microwave circuits and broadband antennas of the Vivaldi type, an experimental laboratory installation for signal registration of time-scale radio images in the spectral region of 0.03–6.0 GHz has been built. The dependences of the influence of the angular characteristics of the object on the spectral-temporal structure of the formation of phase-dynamic radio images have been experimentally established. As the time-scale postprocessing of radio images, a method of cepstral transformation of S-parametric characteristics with convolution of basic signatures in the radiogenic part of the irradiated object is proposed. A series of cepstral convolutions of phase-dynamic radio images was obtained, establishing a functional relationship between the change of the signature of an object in time with its radio genome.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 9","pages":"311 - 318"},"PeriodicalIF":0.6,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum Black Holes in the Expanding Universe 膨胀宇宙中的量子黑洞

IF 0.6 4区物理与天体物理

Doklady Physics Pub Date : 2024-02-15 DOI: 10.1134/S1028335823070042

V. P. Neznamov, I. I. Safronov, V. E. Shemarulin

引用次数: 0

Crystallographic Characteristics of Phase Transformations in the Field of Medium-Carbon Steels of a Joint Obtained by Rotational Friction Welding 旋转摩擦焊接接头中碳钢相变的晶体学特征

IF 0.6 4区物理与天体物理

Doklady Physics Pub Date : 2024-02-15 DOI: 10.1134/S1028335823070078

V. M. Schastlivtsev, I. L. Yakovleva, M. L. Lobanov, E. Yu. Priymak

引用次数: 0

Influence of a Uniform Magnetic Field on the Generation of Strong Small-Scale Magnetic Fields during the Injection of a Plasma with Hot Electrons into an Inhomogeneous Cold Plasma Layer 向不均匀冷等离子体层注入带热电子的等离子体时，均匀磁场对产生强小尺度磁场的影响

IF 0.6 4区物理与天体物理

Doklady Physics Pub Date : 2024-01-29 DOI: 10.1134/S1028335823050099

V. V. Kocharovsky, M. A. Garasev, E. V. Derishev, A. A. Nechaev, A. N. Stepanov

{"title":"Influence of a Uniform Magnetic Field on the Generation of Strong Small-Scale Magnetic Fields during the Injection of a Plasma with Hot Electrons into an Inhomogeneous Cold Plasma Layer","authors":"V. V. Kocharovsky, M. A. Garasev, E. V. Derishev, A. A. Nechaev, A. N. Stepanov","doi":"10.1134/S1028335823050099","DOIUrl":"10.1134/S1028335823050099","url":null,"abstract":"We carry out a numerical modeling of plasma injection with hot electrons into a thin layer of cold plasma in the presence of an external magnetic field. We show that the latter can significantly affect the emerging small-scale current filaments and sheets, even if it does not magnetize the particles and does not change the overall dynamics of the redistribution of the total plasma density in the process of injection. The effect observed depends on the orientation of the external magnetic field that is parallel to the plane that bounds the cold plasma layer, if the injection occurs from a narrow strip lying in this plane. In this situation, which corresponds to the ablation of a flat target by a femtosecond laser beam using cylindrical focusing, we study the evolution of the characteristic structures of the formed small-scale magnetic field. It is established that its generation is associated with instabilities of the anisotropic velocity distribution of electrons and that its value can be many times greater than the value of the external magnetic field.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 5","pages":"149 - 154"},"PeriodicalIF":0.6,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Detonation of a Combustible Gas Mixture upon the Interaction of a Shock Wave with an Ellipsoidal Inert Gas Bubble 冲击波与椭圆形惰性气体泡相互作用时可燃混合气体的引爆

IF 0.6 4区物理与天体物理

Doklady Physics Pub Date : 2024-01-29 DOI: 10.1134/S1028335823050075

P. Yu. Georgievskiy, O. G. Sutyrin

{"title":"Detonation of a Combustible Gas Mixture upon the Interaction of a Shock Wave with an Ellipsoidal Inert Gas Bubble","authors":"P. Yu. Georgievskiy, O. G. Sutyrin","doi":"10.1134/S1028335823050075","DOIUrl":"10.1134/S1028335823050075","url":null,"abstract":"The interaction of a shock wave in a combustible gas mixture with an ellipsoidal region of an inert gas of increased density is numerically simulated using the Euler equations in the two-dimensional plane and axisymmetric formulations. Four qualitatively different regimes of indirect initiation of detonation have been found: upon reflection of a wave from the gas interface, upon focusing of secondary transverse shock waves on the axis/plane of symmetry, upon amplification of a transverse wave converging to the axis of symmetry, and upon secondary focusing of waves in front of the bubble. It is shown that the mode of detonation initiation depends significantly on both the intensity of the shock wave and the shape of the bubble. Based on a series of simulations, the dependence of the threshold Mach numbers of the incident wave on the shape of the bubble is determined. In the plane flow, a moderate elongation of the bubble leads to a significant decrease in the threshold Mach number. In an axisymmetric flow, the lower threshold Mach number is less sensitive to the shape of the bubble, and the most effective detonation initiation is carried out using a spherical bubble. The effect of shock wave focusing makes it possible to achieve successful initiation of detonation at a fundamentally lower intensity of the incident wave compared to direct initiation.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 5","pages":"164 - 170"},"PeriodicalIF":0.6,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139578988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Forced Longitudinal Oscillations of Gas and Aerosol in an Open Tube with a Cross-Sectional Jump 带有横截面跃迁的开口管中气体和气溶胶的强迫纵向振荡

IF 0.6 4区物理与天体物理

Doklady Physics Pub Date : 2024-01-29 DOI: 10.1134/S1028335823050087

D. A. Gubaidullin, L. R. Shaidullin, S. A. Fadeev

引用次数: 0

Multistability in a Chiral Semiconductor Microcavity 手性半导体微腔的多稳定性

IF 0.6 4区物理与天体物理

Doklady Physics Pub Date : 2024-01-29 DOI: 10.1134/S1028335823050051

O. A. Dmitrieva, N. A. Gippius, S. G. Tikhodeev

引用次数: 0

Determination of the Electro-Optical Coefficients of Barium Titanate 测定钛酸钡的电光系数

IF 0.6 4区物理与天体物理

Doklady Physics Pub Date : 2024-01-29 DOI: 10.1134/S1028335823050142

V. B. Shirokov, P. E. Timoshenko, V. V. Kalinchuk

引用次数: 0

A Turbulent Boundary Layer on a Permeable Plate in a Supersonic Flow with a Positive Pressure Gradient under Foreign Gas Injection 外来气体注入下具有正压梯度的超音速流中透气板上的湍流边界层

IF 0.6 4区物理与天体物理

Doklady Physics Pub Date : 2024-01-29 DOI: 10.1134/S1028335823050129

A. I. Leontiev, V. G. Lushchik, M. S. Makarova

引用次数: 0

Nonlinear Phenomena During the Propagation of Powerful Nanosecond Electromagnetic Pulses in Large-Scale Strip Lines in Gas at Low Pressure 强力纳秒电磁脉冲在低压气体中的大规模带状线传播过程中的非线性现象

IF 0.6 4区物理与天体物理

Doklady Physics Pub Date : 2024-01-29 DOI: 10.1134/S1028335823050105

S. V. Korobkov, M. E. Gushchin, A. V. Strikovskiy, I. M. Vershinin, I. Yu. Zudin, K. N. Loskutov, A. S. Nikolenko, A. V. Palitsin, A. V. Gromov, M. B. Goykhman, E. A. Mareev

{"title":"Nonlinear Phenomena During the Propagation of Powerful Nanosecond Electromagnetic Pulses in Large-Scale Strip Lines in Gas at Low Pressure","authors":"S. V. Korobkov, M. E. Gushchin, A. V. Strikovskiy, I. M. Vershinin, I. Yu. Zudin, K. N. Loskutov, A. S. Nikolenko, A. V. Palitsin, A. V. Gromov, M. B. Goykhman,  E. A. Mareev","doi":"10.1134/S1028335823050105","DOIUrl":"10.1134/S1028335823050105","url":null,"abstract":"Experiments on the propagation of powerful high-voltage pulses with a duration on the order of a nanosecond or less in large-scale transmission lines in an atmosphere of various gases make it possible to solve a wide range of fundamental and applied problems, from modeling the passage of electromagnetic pulses (EMPs) through the atmosphere to estimating the electrical strength of elements of pulsed high-voltage gas-filled systems. At the Institute of Applied Physics, Russian Academy of Sciences, experiments with strip lines with a length of up to 5 m were conducted using the Krot and Sprait setups. When EMP propagates with an electric field strength level of up to 100 kV/m in a rarefied gas, effects such as the formation of inhomogeneous and significantly nonstationary glow structures, nonlinear absorption, and dispersive transformation of the shape of high-power pulses caused by gas ionization in the EMP field are studied.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 6","pages":"181 - 185"},"PeriodicalIF":0.6,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139648408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0