"Technical Physics Letters"

Golovachev, Yu. P.;Sushchikh, S. Yu.

doi: 10.1134/1.1262473pmid: N/A

Abstract The slowing of an ionized gas in a supersonic diffuser operating as a magnetohydrodynamic (MHD) generator is investigated by numerical simulation. The calculation results, which reveal a significant dependence of the static pressure level and the Mach number distribution in the exit cross section of the diffuser on the design of the electrode system, are presented.

Skokov, V. N.;Koverda, V. P.

doi: 10.1134/1.1262474pmid: N/A

Abstract A mathematical model for the appearance of fluctuations with a spectrum inversely proportional to the frequency (flicker or 1/f noise) upon the intersection of phase transitions is proposed. A system with a two-valley potential, whose dynamics are described by two coupled nonlinear Langevin equations that transform Gaussian δ-correlated noise (white noise) into two modes of stochastic fluctuations with spectra having 1/f μ and 1/f v frequency distributions, where μ ≈ 1 and 1.5 ⩽ v ⩽ 2, is considered.

Gubenko, A. E.;Venus, G. B.;Gadzhiev, I. M.;Portnoĭ, E. L.

doi: 10.1134/1.1262475pmid: N/A

Abstract The near-threshold lasing regimes of AlGaAs lasers with an implanted saturated absorber under short pulsed pumping are investigated experimentally. A near-threshold modesynchronization regime is obtained.

Golikov, Yu. K.;Grigor’ev, D. V.;Shorina, T. A.

doi: 10.1134/1.1262476pmid: N/A

Abstract A new class of axisymmetric Laplace potentials with an annular feature that can be described by elementary functions is introduced. The possibilities of employing these potentials in the synthesis of energy-analyzing systems and lenses are discussed. Equipotential portraits of electric fields with annular features are presented.

Aduev, B. P.;Aluker, É. D.;Krechetov, A. G.;Mitrofanov, A. Yu.;Gordienko, A. B.;Poplavnoĭ, A. S.

doi: 10.1134/1.1262477pmid: N/A

Abstract The time-resolved predetonation luminescence spectrum of thallium azide is measured by the “spectrum-during-a-pulse” method. Good agreement between the spectrum obtained and the results of a theoretical calculation of the valence-band density of states of TlN3 is noted.

Zuev, L. B.;Murav’ev, V. V.;Danilova, Yu. S.

doi: 10.1134/1.1262478pmid: N/A

Abstract A formal criterion for fatigue failure in steels, which permits reliable detection of the transition to the final stage of the process on the basis of the form of the dependence of the propagation velocity of ultrasonic waves in them on the number of loading cycles and the derivatives of this function with respect to the number of cycles, is established. The nature of the phenomena associated with the variation of the ultrasound velocity during the accumulation of fatigue damage is analyzed.

Kolmakov, I. A.

doi: 10.1134/1.1262479pmid: N/A

Abstract An explanation for the formation of plane waves traveling in opposite directions from a region with cylindrical waves in the medium within a channel is presented. The problem of the form of the region generating the plane waves and the problem of the field formed near that region are solved. The results obtained can be useful for technical applications.

Dovator, N. A.

doi: 10.1134/1.1262480pmid: N/A

Abstract A simple design for a miniature cesium magnetometer intended for measuring the residual magnetic induction (B 0≤1000 nT) in ferromagnetic shields of cylindrical shape with an internal diameter ⊘≥15 mm is described.

Kal’yanov, É. V.

doi: 10.1134/1.1262481pmid: N/A

Abstract A ring system of triggers connected to one another by integrating circuits is studied. Equations for a multiple-trigger ring systems are given, and the results of a numerical analysis for a system containing three triggers are presented. It is shown that chaotic oscillations with switching between two basins of attraction are excited in the ring system considered. The possibility of controlling chaotic oscillations is demonstrated.

Dolgopolov, V. V.

doi: 10.1134/1.1262482pmid: N/A

Abstract It is shown that a semifinite modulated electron beam in a vacuum emits an electromagnetic field. The radiation fields and the radiated power are found.