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  • Change of Orientation of a Rigid Body by Means of an Auxiliary Mass
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    F. L. Chernousko

    Abstract— The problem of control of the spatial orientation for a rigid body is considered by means of an auxiliary point mass. Motion of the point mass is obtained that provides the prescribed change of the body orientation.

    更新日期:2020-05-07
  • An Integrally Asymmetric Flow Past a Plate with an Upstream-Moving Surface
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    A. M. Gaifullin, S. A. Nakrokhin

    Abstract This paper considers the flow of a viscous ideal gas past a plate with an upstream-moving surface. A new type of nonstationary periodic flow with integral asymmetry of aerodynamic characteristics is discovered at transonic free-stream velocities.

    更新日期:2020-05-07
  • A Problem on a Viscous Layer Deformation
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    E. N. Zhuravleva, V. V. Pukhnachev

    Abstract The axisymmetric motion of a viscous incompressible fluid in a layer bounded by a solid plane and the free surface parallel to it is considered. There are three regimes of motion in the problem: stabilization to rest, collapse in a finite time, and an intermediate self-similar regime in which the viscous layer expands unlimitedly in an infinite time.

    更新日期:2020-05-07
  • Specificities of Ultrasonic Vibrations upon Strain Localization
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    S. N. Buravova, I. S. Gordopolova, E. V. Petrov, M. I. Alymov

    Abstract Powerful ultrasonic vibrations of a rigid body that arise during shock-wave loading are the result of the interaction of compression and unloading waves with the faces of the sample and with each other, which proceeds in the form of standing waves. Shock-wave ultrasound accompanies the process of localization of plastic deformation. It is shown that the duration of the vibration of the sample

    更新日期:2020-05-07
  • Stability of the Bernoulli–Euler Beam under the Action of a Moving Thermal Source
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    N. F. Morozov, D. A. Indeitsev, A. V. Lukin, I. A. Popov, O. V. Privalova, L. V. Shtukin

    Abstract In this work, the problem of the propagation of a deflection wave in a Bernoulli–Euler beam during motion of the thermal source is solved, and the influence of the thermal bending moment and longitudinal force is analyzed. It has been established that the concentrated bending moment moving together with the heated region boundary determines the mode of the deflection wave, but cannot lead

    更新日期:2020-05-07
  • Propagation of Perturbations in a Boundary Layer under Strong Hypersonic Interaction
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    I. I. Lipatov, V. K. Pham

    Abstract— Nonstationary processes in a hypersonic boundary layer are studied. A phase shift by propagation of perturbations upstream was found caused by a finite upstream propagation velocity of perturbations.

    更新日期:2020-05-07
  • Model of Helium and Water Vapor Adsorption by a Microsphere-Based Porous Composite Sorbent
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    A. S. Vereshchagin, V. N. Zinovyev, I. V. Kazanin, A. Yu. Pak, V. A. Lebiga, V. M. Fomin

    Abstract In this paper, we propose a mathematical model to describe the dynamics of a mixture of gases, including helium and water vapor, in a layer of a resting composite sorbent based on microspheres and a porous matrix of an aluminum oxide moisture absorber using the multiphase media mechanics approach. We show how to match the flow in a porous adsorber medium and the diffusion of gases in a cylindrical

    更新日期:2020-05-07
  • Terahertz and Infrared Spectroscopy of Dense and Porous Organosilicate Glass Thin Films
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    G. A. Komandin, V. S. Nozdrin, G. A. Orlov, D. S. Seregin, V. N. Kurlov, K. A. Vorotilov, A. S. Sigov

    Abstract Wide-range measurements of thin films of SiCxOyHz organosilicate glasses, both dense and porous, deposited on dielectric sapphire substrates and conductive layers of platinum and aluminum, were performed in the THz–IR (5–5000 cm–1) range. This method can be used not only to analyze the evolution of absorption bands in amorphous dielectric films but also to evaluate static conductivity in the

    更新日期:2020-05-07
  • Spreading of a Water Drop in an Oil Layer
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    Yu. D. Chashechkin, A. Yu. Ilinykh

    Abstract— For the first time, the evolution of the spreading pattern of a fallen water drop over the surface of a cavity and a crown in a deep layer of oil has been traced by high-resolution video and photography. At the stage of active drop submergence, the double layer formed by the contacting surfaces of immiscible fluids is the most rapid component of the flow. Droplets containing both fluids fly

    更新日期:2020-05-07
  • A Detonation Afterburner
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    S. M. Frolov, V. S. Ivanov, I. O. Shamshin, V. S. Aksenov, M. Yu. Vovk, I. V. Mokrynskij, V. A. Bruskov, D. V. Igonkin, S. N. Moskvitin, A. A. Illarionov, E. Yu. Marchukov

    Abstract For the first time, a detonation afterburner (DA) for continuous detonation combustion of TS-1 aviation kerosene was developed, manufactured, and tested. Test fires of the DA in combination with a TJ100S-125 small-sized single-circuit turbojet engine were carried out on a ground test bench. In the test fires, stable modes of continuous detonation combustion of aviation kerosene were registered:

    更新日期:2020-05-07
  • Origin of Degradation of the CaF 2 /BaF 2 Buffer Layers on Si(111)
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    I. G. Neizvestny, D. V. Ishchenko, I. O. Akhundov, S. P. Suprun, O. E. Tereshchenko

    Abstract The growth temperature dependences of the capacitance–voltage characteristics and chemical stability of the CaF2/BaF2 buffer layers formed on Si by molecular beam epitaxy have been investigated. Secondary ion mass spectrometry and X-ray photoelectron spectroscopy studies of the CaF2/Si interface suggest that the observed variations can be caused by the enrichment of the Si surface layer with

    更新日期:2020-05-07
  • Evaluation of the Yield Stress of Solids upon Unloading from a Shock-Compressed State
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    G. I. Kanel, A. S. Savinykh

    Abstract A simple method for evaluating the yield stress of shock-compressed material from the measured unit free-surface velocity history is proposed, verified, and approbated. For the first time, the dynamic yield stress of shock-compressed metal (aluminum) is experimentally evaluated at an elevated temperature. It is found that its value is lower than that at the room temperature and lower than

    更新日期:2020-05-07
  • About the Nature of Bead Lightning and Laboratory “Plasmoids”
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    Yu. R. Alanakyan, D. A. Bulankin, V. G. Pevgov, L. V. Smirnov, A. A. Tsvetkov

    Abstract The results of experimental investigations of an electric discharge in an aqueous medium are presented. In the experiment, the formation of luminous balls, which sometimes exploded, is observed in the atmosphere. Spectroscopic investigations show the presence of an increased content of atomic hydrogen in the plasma, which confirms the assumption that the balls formed could be diffusely burning

    更新日期:2020-05-07
  • Concentration Dependences of Molecular Oxygen and Hydrogen in Aqueous Solutions
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    I. V. Baymler, S. V. Gudkov, R. M. Sarimov, A. V. Simakin, I. A. Shcherbakov

    Abstract The concentration dependences of molecular oxygen and hydrogen in aqueous solutions are studied with multiple dilutions and turbulent stirring accompanying the dilution procedure. Deionized water was saturated with molecular hydrogen and molecular oxygen by bubbling. The gas concentration was measured by polarographic methods. Upon reaching a specific number of dilutions, the concentration

    更新日期:2020-05-07
  • An Exact Semi-Inverse Solution for the Family of Geophysical Problems of a Draining Slope
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    K. N. Anakhaev, V. V. Belikov

    Abstract One of the main causes of the appearance of dangerous geophysical slope phenomena is water saturation of slopes and the negative hydrodynamic impact of a stream of underground waters on them. In this work, an exact semi-inverse hydromechanical solution for a family of geophysical problems of a draining slope is obtained based on the theory of functions of a complex variable. Using the method

    更新日期:2020-05-07
  • Synthesis of Diamond from a High-Velocity Microwave Plasma Flow
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    A. K. Rebrov, A. A. Emelyanov, M. Yu. Plotnikov, N. I. Timoshenko, I. B. Yudin

    Abstract A new method of gas-phase diamond deposition with a high-velocity jet used to transport gases activated in microwave plasma to a substrate is developed. Diamond was synthesized from a mixture of hydrogen with the addition of 1% methane. The deposition rate (78 μm/h) was more than an order of magnitude higher than that achieved earlier in experiments with activation of similar initial mixtures

    更新日期:2020-05-07
  • Conditions of the Formation of a Shock Wave under Cavitation in Hydrocarbon Solutions
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    A. Yu. Dnestrovskij, S. A. Voropaev, N. V. Dushenko, S. G. Naimushin, E. M. Galimov

    Abstract We carried out a numerical study of the appearance of a shock wave during the collapse of a bubble in a hydrocarbon aqueous solution. The conditions for the appearance of a shock wave are obtained depending on the solute, the concentration of the solution, and the temperature. This work was carried out as part of the development of a method for producing diamonds upon cavitation in carbon-containing

    更新日期:2020-05-07
  • Simulation of the Motion of Groundwater for a Rectangular Bridge with a Screen
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    E. N. Bereslavskii, Ya. M. Dalinger, L. M. Dudina

    Abstract Within the framework of the steady-state flat filtering of an incompressible fluid according to Darcy’s law, we obtain an accurate analytical solution to the problem of a flow in a rectangular bridge with a screen in the presence of evaporation from the free surface of groundwater. The limiting cases of the motion under consideration are noted, that is, filtration in a pressureless reservoir

    更新日期:2020-05-07
  • Deformation of Cavitation Bubbles during Implementation of Their Supercompression in a Cluster
    Dokl. Phys. (IF 0.65) Pub Date : 2020-05-07
    R. I. Nigmatulin, A. A. Aganin, A. I. Davletshin

    Abstract The deformations of cavitation bubbles in the central region of clusters under their superstrong expansion and compression are studied. The conditions close to those in the well-known experiments on the acoustic cavitation of deuterated acetone are assumed. The simplest model of a cluster composed of seven initially spherical bubbles, the centers of which are located on three mutually perpendicular

    更新日期:2020-05-07
  • Source of a Mega-Ampere Current with ~100-ns Time of Rise Based on an Explosive Magnetic Generator
    Dokl. Phys. (IF 0.65) Pub Date : 2020-02-28
    A. A. Bazanov, E. I. Bochkov, S. G. Garanin, P. V. Duday, A. A. Zimenkov, A. V. Ivanovskiy, K. N. Klimushkin, V. M. Komarov, A. I. Krayev, V. B. Kudel’kin, V. I. Mamyshev, S. M. Polyushko, Z. S. Tsibikov, E. V. Shapovalov

    Abstract To achieve the thermonuclear-ignition threshold in the scheme of indirect X-ray irradiation of the Z-pinch, it is necessary to implode the liner by a current with an amplitude of ~65 МА within a time of ~100 ns. Currents with such parameters can be generated using super-power disk-type explosive magnetic generators and a two-stage current pulse-sharpening system based on foil, electrically

    更新日期:2020-02-28
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