Doklady Physics
ISSN (print): 2686-7400
Media registration certificate: № FS 77 - 77142 dated 06.11.2019
Founder: Russian Academy of Sciences
Editor-in-Chief: Sergey Vladimirovich Garnov, academician of the Russian Academy of Sciences, Doctor of Physical and Mathematical Sciences
Number of issues per year: 6 issues per year / Subscription
Indexation: RISC, White List (level 3)
The journal "Doklady рhysics" publishes short communications containing the results of priority, original, previously unpublished research in physics, mechanics and technical sciences. The aim of the journal is to familiarize a wide range of specialists with the latest achievements in various sections of these sciences. The high quality of publications is ensured by compliance with the requirements for manuscripts and comprehensive peer review.
The journal publishes reports authored by full members (academicians) and corresponding members of the Russian Academy of Sciences. The Journal also publishes reports of other authors submitted by academicians of the Russian Academy of Sciences in the corresponding specialty.
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Volume 524, Nº 1 (2025)
ФИЗИКА
ESTIMATION OF DISTANCE TO A SOUND SOURCE IN THE DEEP SEA USING A HORIZONTAL OR VERTICAL ANTENNA
Resumo
A new method for estimating the distance to a source of acoustic signals using a horizontal or vertical antenna is proposed and investigated. The distance is determined at frequencies for which the source at the desired distance is located in the zones of interference maxima of sound pressure. In such zones, the ratio of the “effective phase and group velocities” tends to unity, which allows measuring the distance to the source. In the paper, range estimates for a source located in two zones of acoustic illumination and in the shadow zone are compared for the first time.
Doklady Physics. 2025;524(1):3-8
3-8
GENERATION OF INTENSE PULSES – “ROGUE WAVES” OF THE TERAHERTZ BAND IN A GYROTRON IN THE FREQUENCY MULTIPLICATION MODE
Resumo
The frequency multiplication effect in a gyrotron operating under conditions of a large excess of the operating current over the starting value (large supercriticality) was studied. It was shown that in a gyrotron with an operating frequency of 0.5 THz at the first cyclotron harmonic in the frequency multiplication mode at the sixth cyclotron harmonic it is possible to excite random sequences of ultrashort pulses in the range of 3 THz with a peak power of up to 200 W, which is two orders of magnitude higher than the background value.
Doklady Physics. 2025;524(1):9-14
9-14
NANOSCALE STRANTRONIC MAGNETOELETRIC CELL FOR NEUROMORPHIC SYSTEMS
Resumo
Results are reported on numerical-analytic modelling of functional characteristics of a nanoscale neuron-like magnetoelectric cell. Nonlinear transfer activation functions of a composite cell and conditions of their formation in spin-reorientation processes in the magnet sub-system were determined. As applied to the transformation of random pulsed signals, threshold modes of generation of inverse polarity spikes were demonstrated as well as phenomena of potential accumulation followed by an abrupt change of the system’s state of the Integrate-and-Fire type. Magnitude of signals at input and output of the nanoscale cell values few millivolts. The activation function type and the threshold values of input signals are controlled by magnetizing field, which permits to expand the functional capabilities of components for analog neuromorphic systems.
Doklady Physics. 2025;524(1):15-22
15-22
HIDDEN COHERENT STRUCTURE AND PHASE CORRELATIONS OF UNPOLARIZED LIGHT IN MULTIPLE SCATTERING
Resumo
A new conceptual interpretation of the nature of depolarized light is presented. According to this view, light undergoing multiple scattering in a turbid, disordered medium, although formally unpolarized, retains a hidden coherent structure. In contrast to light from incoherent sources (e.g., natural sunlight), which consists of short, uncorrelated wave packets, scattered coherent laser light can be understood as a systematically organized superposition of circularly polarized components with opposite helicities and stable phase relationships. It is shown that the apparent depolarization of scattered light arises not from complete randomization, but from a structured overlap of left- and right-circularly polarized wave packet pairs, indicating the presence of macroscopic phase correlations in the scattered field within optically dense dispersive medium, such as a biological tissue. These findings significantly expand the potential of biomedical polarimetry, revealing its capability to act as a functional analogue of quantum sensing, capable of detecting and exploiting entangled phase states that emerge naturally from coherent scattering events in biological medium.
Doklady Physics. 2025;524(1):23-32
23-32
ON TRANSITION RADIATION IN ACOUSTICS
Resumo
The phenomenon of transition radiation and the analogy between acoustic and optical effects are discussed. Examples are given. The reflection of a single broadband acoustic pressure pulse from a thin, highly contrasting inhomogeneity is calculated. The process of acoustic field generation during abrupt braking of a sphere moving at subsonic speed is analyzed. The possibility of radiation by a vortex generated during the formation of an acoustic flow is discussed, taking into account hydrodynamic nonlinearity. The process of rapid bending of the interface of immiscible liquids caused by a pulse of radiation force, as well as the radiation of a body flying over an uneven surface, are considered.
Doklady Physics. 2025;524(1):33-39
33-39
SCALING CORRELATIONS OF DYNAMIC HIGH-INTENSITY PROCESSES
Resumo
The paper studies spectral singularities of multi-fractal measure f (α) of a number of non-equilibrium processes and shows that dissipative structure cascades on various time-scale levels statistically have self-similar distributions. A multi-fractal comparative analysis of quantitative dissipative structure characteristics in tera- and gigapascal regions and time intervals of non-equilibrium states t ∼ 10−10 s, t ∼ 10−8 s, t ∼ 10−5 s has been conducted for the first time.
Doklady Physics. 2025;524(1):40-44
40-44
МЕХАНИКА
TO THE PROCESS OF TRANSONIC TRANSITION OF FLOW IN A NOZZLE
Resumo
The possibility of existence of inflection points on the sonic line is substantiated. This approach to the analysis of transonic transition allows us to substantiate the possibility of a continuous process of flow restructuring during acceleration of a transonic nozzle from subsonic to supersonic mode.
Doklady Physics. 2025;524(1):45-49
45-49
STUDY OF THE MECHANISMS OF PENETRATION OF SOUND SHOCK INTO A ROOM
Resumo
This paper presents the results of numerical modeling of the penetration of a sonic boom into a room through a building window. The calculation results are validated by field measurements of a sonic boom caused by a supersonic aircraft flying at cruising altitude. It is found that the main transmission mechanism is the displacement of the window frame in the window opening as a whole, and not the excitation of the first natural mode of the window. The influence of the stiffness and damping of the sealing of the window unit in the window opening on the passage of a sonic boom is studied. It is found that an increase in both of these parameters significantly reduces the amplitude of the sonic boom inside the room.
Doklady Physics. 2025;524(1):50-58
50-58
SUPERPOSITION OF TWO NONSTEADY ONE-DIMENSIONAL SHEARS IN A PLANE VISCOUS LAYER
Resumo
The stability of the unsteady flow of a Newtonian viscous medium, which is a superposition of two one-dimensional orthogonal shears in a layer between parallel planes, relative to the three-dimensional picture of kinematic perturbations, is investigated. Using the method of integral relations, sufficient integral estimates of the development of initial disturbances and their non-growth over an infinite time interval are derived. The cases of stationary main motion, acceleration and deceleration in different directions are considered.
Doklady Physics. 2025;524(1):59-62
59-62
EXPANSIONS IN PAPKOVICH—FADLE FUNCTIONS IN THE PROBLEM FOR A HALF-STRIP WITH A CLAMPED END
Resumo
In this paper, we construct an exact solution to the well-known boundary value problem of the theory of elasticity on the tension of a free half-strip with a rigidly clamped end. The solution is represented by series in Papkovich—Fadle eigenfunctions, the coefficients of which are determined in an explicit form. The solution is based on the Papkovich orthogonality relation and Lagrange expansions. The behavior of stresses near the corner points of the half-strip is investigated. A comparison of the exact solution and numerical one obtained on the basis of the finite element method is given.
Doklady Physics. 2025;524(1):63-68
63-68
TRANSITION FROM STRATIFIED TO ANNULAR FLOW IN A FLAT MINICHANNEL AT HIGH LIQUID AND GAS VELOCITIES
Resumo
This study is devoted to the experimental investigation of the transition from stratified to annular flow in a flat minichannel at various gas and liquid velocities, including condition of turbulent flow. Water and air were used as the components of the two-phase flow. It was found that the transition to annular flow at high liquid and gas flow rates occurred not only due to side wall wetting, as reported in the literature, but also due to drop entrainment. Moreover, when the influence of side wall wettability was eliminated by placing fibers into recesses near the side walls of the minichannel, the transition to annular flow at high liquid and gas flow rates occurred solely due to drop entrainment from the wavy gas-liquid interface, which, to the best of the authors' knowledge, was obtained for the first time.
Doklady Physics. 2025;524(1):69-75
69-75
ТЕХНИЧЕСКИЕ НАУКИ
REGISTRATION OF SOUND PACKETS WHEN A FALLING DROP MERGES WITH A LIQUID IN AN ELECTROSTATIC FIELD
Resumo
For the first time, synchronized video recording of the flow pattern and acoustic pressure by a hydrophone was performed during the merging of a falling drop of distilled water with a liquid at rest in an electrostatic field. The generator anode is connected to the tip of a capillary drop dispenser, the flat cathode is placed on the bottom of a pool filled with tap water. In the impact flow mode, when the kinetic energy of the falling drop significantly exceeds its potential surface energy, a reduction in the chronogram duration, a refinement of the flow pattern and an increase in the frequency of the resonant packet are observed when the electrostatic field is applied. The observed changes indicate a strong influence of the electrostatic field on the structure of droplet flows in the phase of formation and separation of gas cavities emitting resonant acoustic signals.
Doklady Physics. 2025;524(1):76-88
76-88