The origin of stochastic oscillations in a system with delayed feedback
The origin of stochastic oscillations in a system with delayed feedback
P.S. Landa, S.M. Perminov
An oscillatory system with delayed feedback is considered in relation to three possible ways of transition from periodic oscillations to stochastic ones: 1) via an infinite sequence of bifurcations involving period doubling, 2) by merging of an unstable limit cycle with a stable singular point, and 3) by the formation and disruption of an almost periodic state.
Show AbstractInteraction of a relativisitic electron beam with waves in a diaphragmed waveguide
Interaction of a relativisitic electron beam with waves in a diaphragmed waveguide
A.M. Afonin, A.D. Poezd
A model is considered for a relativistic high-current UHF amplifier in which the diameter of the periodic slow-wave system is many wave-lengths. The stationary case is examined, the discussion being restricted to the interaction of an electron beam with axially symmetrical waves of E type. The simulation has been performed by the reference-particle method, with the electromagnetic field in the slow-wave system calculated by Galerkin's method.
Show AbstractSimulating electromagnetic-wave excitation in an inhomogeneous magnetospheric plasma
Simulating electromagnetic-wave excitation in an inhomogeneous magnetospheric plasma
V.P. Modenov, A.D. Poezd, E.D. Poezd
Electromagnetic-wave propagation is considered for a nonequilibrium anisotropic medium with planar stratification. A combined fitting algorithm is used to examine the scope for the excitation in the magnetosphere of electron fluxes related to the Earth's kilometer radiation known from geophysics. The results agree with experimental data.
Show AbstractRecovering the input of a GW antenna with a parametric converter
Recovering the input of a GW antenna with a parametric converter
S.I. Babichenko, V.N. Rudenko
A numerical experiment is reported on recovering the input to a gravitational antenna. It is shown to be desirable to use a parametric transducer as the recording component. An additional increase in the recovery accuracy is provided by using dynamic damping for the sensor noise.
Show AbstractEffects of plasma density inhomogeneity on the pulse-probe response
Effects of plasma density inhomogeneity on the pulse-probe response
A.A. Kuzovnikov, V.S. Sviridkina, A.K. Sukhov, V.V. Tarasova
Experimental results are presented on the effects of plasma density inhomogeneity on the perturbations arising from an external pulsed voltage source. It is found that the inhomogeneity damps the waves arising from the leading or trailing edges of the pulse because of additional charged-particle loss.
Show AbstractExperiment automation in polarization type two-frequency Raman spectroscopy
Experiment automation in polarization type two-frequency Raman spectroscopy
M.F. Vigasina, A.A. Ivanov, R.Yu. Orlov
A description is given of a two-frequency Raman spectrometer for examining organic compounds, which has been automated with a D3-28 minicomputer.
Show AbstractOscillator strengths and excited-state lifetimes for the cations of 2,6-diarylpyrylium salts
Oscillator strengths and excited-state lifetimes for the cations of 2,6-diarylpyrylium salts
A.I. Akimov, N.I. Rezaev
Measurements have been made on the absorption spectra in acetonitrile for 2,6-diarylpyrylium salts. It is found that the addition of various radicals to the 2,6-diphenylpyrylium cation influences the excited-state lifetimes and the oscillator strengths for the various absorption bands. The largest increase in the sum of the oscillator screngths for all the absorption bands occurs when phenyl or oxalkyl radicals are attached to the cation.
Show AbstractDynamic optical-radiation autofocusing
Dynamic optical-radiation autofocusing
A.P. Sukhorukov, V.A. Trofimov
An aberration-free description is given of dynamic wave-front control designed to improve the concentration at a moving detector. Focusing and wave-front inclination laws have been derived for a continuous control algorithm. Aspects of speed and efficiency in flexible-mirror control are examined with and without constraints on their profiles.
Show AbstractEffects of molecular oxide films on the luminescence of adsorbed erythrosine molecules in a semiconductor-insulator system
Effects of molecular oxide films on the luminescence of adsorbed erythrosine molecules in a semiconductor-insulator system
V.A. Bespalov, V.E. Drozd, L.V. Levshin, G.S. Plotnikov, A.M. Saletskii, V.I. Yuzhakov
Measurements have been made on the luminescence of adsorbed erythrosine on the surfaces of $Ge-GeO_2$ and $Ge-GeO_2$-transition-metal oxide structures, as well as charge transfers in electron and hole surface traps on illumination in the dye absorption band. It has been found that the trap photodepletion in such systems is due to excitation-energy transfer from the adsorbed molecules; there is a correlation between the structure of the surface oxide layers and the performance in that process.
Show AbstractDetermination of component parameters for a compound spectrum by derivative spectrophotometry
Determination of component parameters for a compound spectrum by derivative spectrophotometry
V.I. Sidel'nikov
A method is proposed for determining the amplitudes and widths of the components in a compound spectral line by the use of even derivatives. The parameters are calculated from the relative amplitudes of the peaks in the various derivatives corresponding to a given component. The method allows one to use derivative spectrophotometry to describe all the components of a compound spectral line.
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