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Distribution of Electric Fields on the Surface of Inclusions in a Matrix Composite 基质复合材料中夹杂物表面的电场分布
IF 0.6 4区 物理与天体物理
Doklady Physics Pub Date : 2024-03-01 DOI: 10.1134/S1028335823110058
V. I. Kolesnikov, V. B. Yakovlev, I. V. Lavrov, A. P. Sychev, A. V. Bardushkin
{"title":"Distribution of Electric Fields on the Surface of Inclusions in a Matrix Composite","authors":"V. I. Kolesnikov,&nbsp;V. B. Yakovlev,&nbsp;I. V. Lavrov,&nbsp;A. P. Sychev,&nbsp;A. V. Bardushkin","doi":"10.1134/S1028335823110058","DOIUrl":"10.1134/S1028335823110058","url":null,"abstract":"<p>Expressions are obtained for operators of the concentration of the electric field strength and displacement on the surface of inclusions in a matrix composite depending on the shape and volume fraction of inclusions in the material. These operators relate the fields on the inclusion surface on the matrix side with the average values of the electric field strength and displacement in the composite sample.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 11","pages":"370 - 375"},"PeriodicalIF":0.6,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004752","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
Diffusion Combustion of Hydrogen in a Microjet Outflowing from a Curvilinear Channel 从曲线通道流出的微射流中的氢扩散燃烧
IF 0.6 4区 物理与天体物理
Doklady Physics Pub Date : 2024-03-01 DOI: 10.1134/S1028335823120066
V. V. Kozlov, A. V. Dovgal, M. V. Litvinenko, Yu. A. Litvinenko, A. G. Shmakov
{"title":"Diffusion Combustion of Hydrogen in a Microjet Outflowing from a Curvilinear Channel","authors":"V. V. Kozlov,&nbsp;A. V. Dovgal,&nbsp;M. V. Litvinenko,&nbsp;Yu. A. Litvinenko,&nbsp;A. G. Shmakov","doi":"10.1134/S1028335823120066","DOIUrl":"10.1134/S1028335823120066","url":null,"abstract":"<p>In this paper, we examine the combustion of a hydrogen microjet outflowing from a curved channel with a round micronozzle. Jet flows that are generated using rectilinear and curved channels differ in that, in the second case, Dean vortices make a noticeable contribution to the formation of the jet and its combustion. The interaction of the latter with Kelvin–Helmholtz vortices, the formation of which is typical for flows with a velocity shift, causes changes in the combustion characteristics. They include spatial distortions of the laminar flame zone near the nozzle exit, the area of turbulent combustion downstream, as well as the turbulent flame under the conditions of its separation from the nozzle exit and the cessation of laminar combustion in the initial section of the flow. The results of these studies provide the possibility to understand better the combustion features of hydrogen microjets under conditions of their hydrodynamic instability.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 12","pages":"426 - 429"},"PeriodicalIF":0.6,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004825","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
A Free Surface Fluid with Two-Dimensional Periodic Disturbances in Various Models of the Fluid 各种流体模型中具有二维周期性扰动的自由表面流体
IF 0.6 4区 物理与天体物理
Doklady Physics Pub Date : 2024-03-01 DOI: 10.1134/S1028335823110022
Yu. D. Chashechkin, A. A. Ochirov
{"title":"A Free Surface Fluid with Two-Dimensional Periodic Disturbances in Various Models of the Fluid","authors":"Yu. D. Chashechkin,&nbsp;A. A. Ochirov","doi":"10.1134/S1028335823110022","DOIUrl":"10.1134/S1028335823110022","url":null,"abstract":"<p>The complete dispersion relations for periodic perturbations of a flat free surface with a positive definite frequency and a complex wavenumber describing spatial attenuation in a viscous stratified charged liquid were obtained in a linear approximation by methods of the theory of singular perturbations for the first time. Regular components of the complete solution describe plane gravitational-capillary waves. Singular components characterize ligaments, i.e., thin flows that are absent in the model of an ideal medium. The obtained dispersion relations in extreme cases uniformly transform into known expressions for inviscid stratified, viscous homogeneous and ideal liquids. The calculated dependencies of the wavelength and thickness of the ligament and the group and phase velocity of the components on the frequency at different values of the media parameters are given.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 11","pages":"394 - 400"},"PeriodicalIF":0.6,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004817","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
A Gauge-Invariant Lagrangian Determined by the n-Point Probability Density Function of a Vorticity Field of Wave Optical Turbulence 由波光学湍流涡度场 n 点概率密度函数确定的量子不变拉格朗日
IF 0.6 4区 物理与天体物理
Doklady Physics Pub Date : 2024-03-01 DOI: 10.1134/S1028335823120042
V. N. Grebenev, A. N. Grishkov
{"title":"A Gauge-Invariant Lagrangian Determined by the n-Point Probability Density Function of a Vorticity Field of Wave Optical Turbulence","authors":"V. N. Grebenev,&nbsp;A. N. Grishkov","doi":"10.1134/S1028335823120042","DOIUrl":"10.1134/S1028335823120042","url":null,"abstract":"<p>The geometric methods for Yang–Mills fields of gauge transformations are applied to find an invariant Lagrangian in the fiber bundle of the configuration of 2<i>d</i> space <i>X</i> of a turbulent flow determined by the <i>n</i>-point probability density function (PDF)  <i>f</i><sub><i>n</i></sub>. The two-dimensional wave optical turbulence is considered in the case of an inverse cascade of turbulence energy transfer under external impacts in the form of white Gaussian noise and large-scale friction. The <i>n</i>-point PDF of the vorticity field satisfies the  <i>f</i><sub><i>n</i></sub>-equation from the Lundgren–Monin–Novikov hierarchy, and the conditions of equation invariance under external action are found. A Lagrangian, which is invariant relative to the <span>(H subset G)</span> subgroup (a group of the gauge transformations in the fiber bundle of the space <i>X</i>), and the conserved currents are constructed.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 12","pages":"416 - 421"},"PeriodicalIF":0.6,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004740","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
Vortex Rings in a Ferromagnet 铁磁体中的涡环
IF 0.6 4区 物理与天体物理
Doklady Physics Pub Date : 2024-03-01 DOI: 10.1134/S1028335823110010
A. B. Borisov, D. V. Dolgikh
{"title":"Vortex Rings in a Ferromagnet","authors":"A. B. Borisov,&nbsp;D. V. Dolgikh","doi":"10.1134/S1028335823110010","DOIUrl":"10.1134/S1028335823110010","url":null,"abstract":"<p>New-type vortex structures in a 3D ferromagnet—vortex rings—are predicted. It is established experimentally that these structures have finite energy. The nature of the interaction of pairs of such rings in the simplest cases is investigated.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 11","pages":"355 - 358"},"PeriodicalIF":0.6,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004613","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
Contact Problems for Two Stamps and a New Type of Crack Model 两个印章的接触问题和一种新型裂纹模型
IF 0.6 4区 物理与天体物理
Doklady Physics Pub Date : 2024-03-01 DOI: 10.1134/S1028335823120017
V. A. Babeshko, O. V. Evdokimova, O. M. Babeshko, M. V. Zaretskaya, V. S. Evdokimov
{"title":"Contact Problems for Two Stamps and a New Type of Crack Model","authors":"V. A. Babeshko,&nbsp;O. V. Evdokimova,&nbsp;O. M. Babeshko,&nbsp;M. V. Zaretskaya,&nbsp;V. S. Evdokimov","doi":"10.1134/S1028335823120017","DOIUrl":"10.1134/S1028335823120017","url":null,"abstract":"<p>In this work, for the first time, an exact solution of the contact problem of interaction with a multilayer base of two semi-infinite stamps, the ends of which are parallel to each other, is constructed. The stamps are assumed to be absolutely rigid, and the distance between them can have any finite value. The task is an important stage in the algorithm for constructing models of a new type of crack in materials of different rheologies. The mechanism of destruction of the medium by cracks of a new type is radically different from the mechanism of destruction of the medium by Griffiths cracks, and has so far been little studied. Griffiths formed his cracks with a smooth border as a result of compression from the sides of an elliptical cavity in the plate. Cracks of a new type have a piecewise smooth border, resulting from the replacement of an ellipse with a rectangle compressed from the sides. The problem considered in this article can be considered as the result of the formation of a new type of crack with absolutely rigid banks and a deformable lower boundary. Thanks to it, after the solution, it becomes possible to switch to deformable stamps and a crack of a new type in the rheological medium. The solution of this problem turned out to be possible due to the construction of exact solutions of the Wiener–Hopf integral equations on a finite segment. This paper shows how the solution of one of the previously unsolved problems allows us to investigate and solve exactly other problems and to identify previously unknown properties and resonances. As a result of constructing an exact solution to the problem, the fact that the solution of dynamic contact problems for stamp systems is not unique was confirmed and a dispersion equation for finding resonant frequencies was constructed.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 12","pages":"410 - 415"},"PeriodicalIF":0.6,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004617","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
Molecular Dynamic Study of the Cratering Process during High-Velocity Impact of Metallic Clusters with a Substrate 金属团簇与基底发生高速撞击时的碎裂过程的分子动力学研究
IF 0.6 4区 物理与天体物理
Doklady Physics Pub Date : 2024-03-01 DOI: 10.1134/S1028335823120078
A. V. Utkin,  V. M. Fomin
{"title":"Molecular Dynamic Study of the Cratering Process during High-Velocity Impact of Metallic Clusters with a Substrate","authors":"A. V. Utkin,&nbsp; V. M. Fomin","doi":"10.1134/S1028335823120078","DOIUrl":"10.1134/S1028335823120078","url":null,"abstract":"<p>In this work, numerical experiments were carried out in the framework of the molecular dynamics method to study the impact interaction of metallic nanoclusters of different sizes with a metallic substrate in a wide range of velocities. Analysis of the data obtained showed that the crater volume remains proportional to the impact energy and inversely proportional to the dynamic strength of the material, with the line slope being independent of the cluster size and the cluster–substrate material.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 12","pages":"430 - 433"},"PeriodicalIF":0.6,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004618","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
Generation of Rectangular Nanosecond Electromagnetic Pulses with a Picosecond Rise Front 产生具有皮秒上升沿的矩形纳秒电磁脉冲
IF 0.6 4区 物理与天体物理
Doklady Physics Pub Date : 2024-03-01 DOI: 10.1134/S1028335823110083
S. V. Garnov, V. V. Bulgakova, T. V. Dolmatov, A. A. Ushakov, V. V. Bukin
{"title":"Generation of Rectangular Nanosecond Electromagnetic Pulses with a Picosecond Rise Front","authors":"S. V. Garnov,&nbsp;V. V. Bulgakova,&nbsp;T. V. Dolmatov,&nbsp;A. A. Ushakov,&nbsp;V. V. Bukin","doi":"10.1134/S1028335823110083","DOIUrl":"10.1134/S1028335823110083","url":null,"abstract":"<p>A method for generation of ultra-wideband electromagnetic pulses with a nanosecond length and a picosecond rise time has been proposed and studied. A horn antenna with a photoconductive switch irradiated by laser pulses has been used as an emitter. It is shown that the length of ultra-wideband electromagnetic pulses is determined by the antenna length and the semiconductor material and the rise front is determined by the front of laser pulses used to initiate a photoconductive switch. Typical pulse lengths of ~1 ns with a rise front of up to ~34 ps are reported.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 11","pages":"366 - 369"},"PeriodicalIF":0.6,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004750","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
New Markers for Determining the Chemical and Isomeric Composition of Carotenoids by Raman Spectroscopy 利用拉曼光谱测定类胡萝卜素化学成分和异构体成分的新标记
IF 0.6 4区 物理与天体物理
Doklady Physics Pub Date : 2024-03-01 DOI: 10.1134/S1028335823110071
D. D. Vasimov, A. A. Ashikhmin, M. A. Bolshakov, M. N. Moskovsky, S. V. Gudkov, D. V. Yanykin, V. S. Novikov
{"title":"New Markers for Determining the Chemical and Isomeric Composition of Carotenoids by Raman Spectroscopy","authors":"D. D. Vasimov,&nbsp;A. A. Ashikhmin,&nbsp;M. A. Bolshakov,&nbsp;M. N. Moskovsky,&nbsp;S. V. Gudkov,&nbsp;D. V. Yanykin,&nbsp;V. S. Novikov","doi":"10.1134/S1028335823110071","DOIUrl":"10.1134/S1028335823110071","url":null,"abstract":"<p>The experimental and calculated on the basis of density functional theory Raman spectra of plant and bacterial carotenoids (neurosporene, spheroidene, lycopene, spirilloxanthin, β-carotene, lutein, ζ-carotene, α-carotene, and γ-carotene) are analyzed. A number of characteristic features in the Raman spectra of carotenoids are described for the first time, which make it possible to determine the structure of the end groups of molecules and to distinguish their isomers.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 11","pages":"359 - 365"},"PeriodicalIF":0.6,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004625","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
Optimization of Motion of a Body with Internal Mass under Quadratic Resistance 带内部质量的物体在二次阻力下的运动优化
IF 0.6 4区 物理与天体物理
Doklady Physics Pub Date : 2024-03-01 DOI: 10.1134/S1028335823110034
F. L. Chernousko
{"title":"Optimization of Motion of a Body with Internal Mass under Quadratic Resistance","authors":"F. L. Chernousko","doi":"10.1134/S1028335823110034","DOIUrl":"10.1134/S1028335823110034","url":null,"abstract":"<p>In this paper, the rectilinear motion of a body controlled by moving internal mass in a medium with quadratic resistance is considered. The conditions under which the translational motion of a body occurs with periodically varying velocity are considered. The average velocity of this movement is determined. Conditions that provide the highest average velocity were established.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"68 11","pages":"387 - 393"},"PeriodicalIF":0.6,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004751","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
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