Radiophysics and Quantum Electronics最新文献

{"title":"Effects of Correlation Interaction of Dislocations During Plastic Deformation of Metals","authors":"G. F. Sarafanov","doi":"10.1007/s11141-026-10503-w","DOIUrl":"10.1007/s11141-026-10503-w","url":null,"abstract":"<p>Based on the continuum theory for the dynamics of a deformable crystal with dislocations, we consider the effect of shielding their elastic field. Representing the dislocation ensemble as a plasma-like medium, we construct a theory of the correlation interaction of screw dislocations. It is shown that the radius of shielding of dislocations is the radius of their correlation. Using the theory being developed, self-consistent evolutionary equations of the dynamics of dislocations are formulated with allowance for their correlation interaction. The study of the corresponding system of equations has shown that in a dislocation ensemble for the total and excess density of dislocations (dislocation charge), under certain conditions, there is an instability of their homogeneous distribution due to the correlation interaction between them. Based on a linear analysis of the initial system, a criterion for this instability related to the critical density of dislocations, above which the instability develops, is obtained. A nonlinear theory for the formation of inhomogeneous cellular structures beyond the bifurcation point has been developed. Using the approach of the theory of dissipative structures, equations of order parameters are obtained. Their study has shown that cellular structures with different types of symmetry can be formed in the system, depending on the number of excited modes parameterized by the number N. As a result, it is shown that crystal-type (rhombic and hexagonal) structures are formed at N = 2, 3, while quasi-crystalline (octagonal, decagonal, etc.) structures are formed at N &gt; 3.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 11","pages":"846 - 873"},"PeriodicalIF":0.8,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear Longitudinal Oscillations of the Wall of a Wedge-Shaped Channel Filled with a Pulsating Viscous Fluid","authors":"V. S. Popov,&nbsp;L. I. Mogilevich,&nbsp;A. A. Popova","doi":"10.1007/s11141-026-10505-8","DOIUrl":"10.1007/s11141-026-10505-8","url":null,"abstract":"<p>We present the formulation and solution of a hydroelasticity problem to determine the nonlinear response for the wall of a wedge-shaped channel filled with a pulsating viscous fluid. A plane problem is considered for the channel formed by rigid walls that are rectangular in plan view. The upper wall is fixed and has a wedge shape, while the bottom one has a nonlinear elastic fixation at the ends and performs steady forced oscillations due to pressure pulsation at the end of the channel. Nonlinear-elastic fixation of the bottom wall is represented by weightless springs with a symmetric hardening stiffness characteristic with cubic nonlinearity. For the fluid in the channel, a model of a Newtonian fluid of constant density is adopted, and its motion is studied as creeping one. A boundary-value problem of mathematical physics was formulated, including the equations of creeping motion for a viscous fluid, the equation of motion of the rigid wall on a nonlinear elastic suspension, as well as boundary conditions for fluid pressure at the ends of the channel and velocities at the contact boundaries between the channel walls and the fluid. Asymptotic analysis of this problem allowed us to find the laws of distribution for the velocities and pressure of a viscous fluid in a wedge-shaped channel and reduce the initial problem to considering the generalized Duffing equation describing nonlinear hydroelastic oscillations of the channel wall. The solution of this equation, carried out using the Krylov–Bogolyubov averaging method for the primary resonance, made it possible to determine the nonlinear hydroelastic amplitude response and phase response, which are implicit functions of the amplitude of oscillations and frequency. A numerical study of these responses was carried out, showing a significant influence of the wedge shape of the channel, the thickness of the fluid layer, and the amplitude of pressure pulsation at the channel end on the amplitude of oscillations, resonance frequencies, and the possibility of unstable oscillations of the bottom wall of the wedge-shaped channel.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 11","pages":"890 - 902"},"PeriodicalIF":0.8,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Longitudinal Elastic Waves in Polycrystalline Rod Systems with Dislocation Hysteresis, Linear Dissipation and Dispersion","authors":"V. E. Nazarov,&nbsp;S. B. Kiyashko","doi":"10.1007/s11141-026-10504-9","DOIUrl":"10.1007/s11141-026-10504-9","url":null,"abstract":"<p>We obtained a hysteresis equation of the state of isotropic polycrystalline solids for longitudinal elastic stresses and strains within the framework of the Granato–Lücke theory of damping due to dislocations. The effects of amplitude-dependent internal friction in a rod and a rod resonator with dislocation hysteresis nonlinearity were studied theoretically and numerically with allowance for linear dissipation and geometric dispersion of the phase velocity of longitudinal waves. Expressions are obtained for the nonlinear damping rate and the change in the propagation velocity of a longitudinal harmonic wave in the rod, for the resonance curve of the resonator, and for the nonlinear losses and shift in the resonance frequency, as well as for the amplitude of the wave at the third harmonic frequency. The obtained results are analyzed graphically and numerically.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 11","pages":"874 - 889"},"PeriodicalIF":0.8,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Method of Resonance Acoustic Spectroscopy in the Problems of Acoustic Diagnostics and Materials Science","authors":"A. V. Lebedev,&nbsp;S. A. Manakov","doi":"10.1007/s11141-026-10502-x","DOIUrl":"10.1007/s11141-026-10502-x","url":null,"abstract":"<p>We present an review of the resonance acoustic spectroscopy method and its use in acoustic diagnostics. Potential applications of the method in the materials science problems is discussed. A brief description of the method is provided along with particular examples of its use in studying the microstructure of materials, assessing fracture density, and estimating the history of loading (plastic deformation). Experimental techniques are also described, which ensure precise measurements and open up new possibilities for nondestructive testing of material strength.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 11","pages":"823 - 845"},"PeriodicalIF":0.8,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Amplitude and Frequency Modulation of the Whistler Wave Packet on Cyclotron Interaction with Energetic Electrons in the Earth’s Magnetosphere","authors":"V. S. Grach,&nbsp;A. G. Demekhov","doi":"10.1007/s11141-026-10496-6","DOIUrl":"10.1007/s11141-026-10496-6","url":null,"abstract":"<p>We consider the resonant interaction of a whistler-mode wave packet with energetic electrons. The wave packet parameters are based on Cluster spacecraft data. Both model profiles of the packet amplitude and frequency (Gaussian and linear, respectively) and profiles taking into account variations in amplitude and frequency, directly based on spacecraft data, are used. The effect of the wave packet amplitude and frequency modulation on the acceleration of electrons and their precipitation into the loss cone as a result of the interaction is analyzed by using test particle simulations.</p><p>It is shown that both modulations have a similar effect on the interaction characteristics: the presence of modulation (amplitude and/or frequency) generally significantly increases the probability of particle trapping by the wave field, but the maximum energy gain for trapped particles decreases. However, there are regions of the initial electron parameters in which, even in the presence of modulation, significant acceleration of individual groups of particles is possible. As a result of the interaction considered, electrons with energies of 20 to 200 keV can effectively precipitate into the loss cone. As the packet propagates away from the equator, less effective precipitation of particles with energies of 200 to 600 keV is possible. The precipitation characteristics depend only weakly on the presence of amplitude and/or frequency modulation of the wave packet.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 10","pages":"743 - 760"},"PeriodicalIF":0.8,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148810936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of a Multiple-Pass Gas Cell with Variable Optical Pathlength for a Terahertz Absorption Spectrometer","authors":"G. K. Raspopin,&nbsp;A. V. Borisov,&nbsp;A. G. Pauliš,&nbsp;G. E. Dunaevsky,&nbsp;V. L. Vax,&nbsp;Yu. V. Kistenev","doi":"10.1007/s11141-026-10499-3","DOIUrl":"10.1007/s11141-026-10499-3","url":null,"abstract":"<p>We present the results of optimizing numerically a small-size cylindrical multipass cell based on a modified Herriott optical scheme. The cell has a separate THz beam input/output system and a common reflective cylindrical element that forms a closed measuring volume. Using numerical modeling methods and the geometric optics approach, the geometry of the cylindrical multipass cell was optimized. It is shown that the use of a reflective element with a parabolic profile allows one to minimize beam deformations during multiple reflections of the beam. The optimized geometry of the input/output system of the radiation and a reflective element having an internal radius of 65 mm and a height of 40 mm ensures the possibility to vary the optical path length in the range from 0.78 m to 2.61 m.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 10","pages":"784 - 791"},"PeriodicalIF":0.8,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148810940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A New Type of Artificial Josephson Atoms for Quantum Simulation of Topological Models","authors":"E. E. Konopleva,&nbsp;G. P. Fedorov,&nbsp;O. V. Astafiev","doi":"10.1007/s11141-026-10501-y","DOIUrl":"10.1007/s11141-026-10501-y","url":null,"abstract":"<p>We propose a scheme for a new artificial atom suitable for constructing quantum simulators of photonic topological models. The design consists of four capacitively shunted Josephson junctions, controlled by an external magnetic flux, in a diamond-shaped configuration. It maintains arbitrary polarization states through two degenerate excited states with mutually orthogonal electric field distributions. Furthermore, we show that a high operating ratio of the Josephson energy to the charge energy suppresses the sensitivity to fluctuating background charges far from the degeneracy points.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 10","pages":"811 - 821"},"PeriodicalIF":0.8,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148810939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A New Aberration Basis for Kolmogorov Wavefronts for Improving Laser Radiation Focusing in Modal Correction","authors":"D. A. Yagnyatinskiy,&nbsp;A. P. Kuznetsov","doi":"10.1007/s11141-026-10500-z","DOIUrl":"10.1007/s11141-026-10500-z","url":null,"abstract":"<p>We derive a mode basis of aberration components of the Kolmogorov wavefront. The basis is characterized by the maximum contribution to the geometric transverse aberration of a uniformly intense circular monochromatic laser beam. The result represents the Karhunen—Loève functions derived from the Lukosz polynomials. With modal successive correction, subtraction of these components from the wavefront results in the strongest decrease of the RMS focal spot radius, allowing for statistical improvement of the focusing effect of laser radiation. The result obtained within the geometric optics approximation is also valid for the diffraction focal spot. Results of numerical simulation show that the characteristic focal spot size depending on the turbulence level can be reduced by several percent or tens of percent, while the Strehl ratio and the power in the bucket can be increased from several percent to more than a hundred percent (as compared to the modal correction of the same number of the known aberration components). It is also proposed to use modified Karhunen—Loève functions as aberration components, which in most cases allow for higher focusing parameters than those with the newly derived Karhunen—Loève—Lukosz modes. These results can be generalized for any given model of atmospheric phase distortions, an arbitrary aperture shape, and a given laser beam apodization.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 10","pages":"792 - 810"},"PeriodicalIF":0.8,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148810938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of Spatial Field Processing Based on the Double Weighted Fourier Transform Method in the Problems of Satellite Diagnostics of the Ionosphere Taking Into Account the Horizontal Drift Velocities of Small-Scale Irregularities","authors":"M. A. Zverev,&nbsp;S. I. Knizhin","doi":"10.1007/s11141-026-10497-5","DOIUrl":"10.1007/s11141-026-10497-5","url":null,"abstract":"<p>We study the possibility of using double spatial field processing based on the double weighted Fourier transform (DWFT) method to increase the resolution of satellite diagnostics of an inhomogeneous ionospheric plasma. The case of synthesizing a line of sources of the probing signal by a low-orbiting satellite of the “Ionosphere-M” type is considered. As a model of the ionosphere, an approximation is used in the form of a background medium represented by a simple Chapman layer, with the addition of horizontally moving local plasma irregularities having dielectric permittivity variations in the form of Gaussian functions. Computer calculations of the phase of the field of a wave that has passed through an inhomogeneous medium showed that for the chosen parameters of the problem, the use of double spatial field processing based on the DWFT method makes it possible to overcome the Fresnel resolution limit for diagnosing small-scale ionospheric irregularities moving with horizontal drift velocities less than 200 and 380 m/s for probing-signal frequencies of 150 and 400 MHz, respectively.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 10","pages":"761 - 772"},"PeriodicalIF":0.8,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148810937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On Simulating the Generation of a Ka-Band Subnanosecond Microwave Peak Train by a Relativistic Backward-Wave Oscillator in the Beam Current Modulation Regime","authors":"L. N. Lobanov,&nbsp;V. V. Rostov,&nbsp;S. A. Shunailov,&nbsp;M. I. Yalandin","doi":"10.1007/s11141-026-10490-y","DOIUrl":"10.1007/s11141-026-10490-y","url":null,"abstract":"<p>We consider numerical models for generating sequences of subgigawatt microwave superradiance (SR) peaks in a relativistic Ka-band backward-wave oscillator (BWO) due to a deep periodic modulation of the electron beam current. In the first model, this regime is achieved by applying a sequence of trapezoidal accelerating pulses to the explosive-emission cathode with a certain delay. The delay duration determines the influence of the residual background of slow spent electrons on the dynamics of formation of the subsequent SR peak and the peak amplitude. In an alternative model, the injected beam current is continuous, but modulated by the preceding SR pulse, which generates strong electric fields in the radial gap near a coaxial insert used in the anode unit of the BWO instead of the resonant reflector. Here, the beam is periodically dumped onto the wall. In this case, unlike the first model, the electrons at the leading edge of the next beam segment have the maximum energy. Therefore, the excitation of subsequent SR pulses is less sensitive to residual slow electrons and occurs under reproducible conditions. The pulses have a short delay and close amplitudes.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 9","pages":"677 - 687"},"PeriodicalIF":0.8,"publicationDate":"2026-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}