Anomalous deflection of Fe vapors by a magnetic field
Anomalous deflection of Fe vapors by a magnetic field
N.I. Shpin'kov, N.S. Perov
A weak (below 400 Oe) low-gradient magnetic field was observed to deflect a small number of evaporated Fe atoms from their initial path by an angle exceeding 90° at distances of about 50 mm. This finding can be explained by the presence of an uncompensated magnetic charge on these atoms.
Show AbstractQuasioptical gyrotron with a three-mirror telescopic resonator
Quasioptical gyrotron with a three-mirror telescopic resonator
A.I. Kostienko, A.F. Korolev, V.M. Pereshein
A new type of three-mirror telescopic resonator has been developed on the basis of mathematical modeling of electron beam interaction with electromagnetic field in a quasioptical gyrotron. The distribution of the RF field in the resonator enables an optirnum beam-field energy exchange. Up to 90% of the transverse beam energy is transferred to the electromagnetic field.
Show AbstractThe mechanism of molecular gas heating in a pulsed free-localizing RF discharge
The mechanism of molecular gas heating in a pulsed free-localizing RF discharge
A.M. Devyatov, A.A. Kuzovnikov, V.V. Lodinev, V.M. Shibkov
The mechanism of heating of a molecular gas in a free-localizing RF discharge in a focused beam was investigated. The experiments were made in nitrogen and air at pressures from 1 to 100 Torr. It has been shown that at high values of the reduced electric field strength, one of the principal mechanisms that bring about gas heating in a free-localizing RF discharge is the quenching of long-living electron-excited states of nitrogen molecules.
Show AbstractThermal noise in a gravitational antenna with a piezoelectric transducer
Thermal noise in a gravitational antenna with a piezoelectric transducer
A.V. Gusev, I.V. Melezhnikov
Thermal noise in a gravitational antenna with a piezoelectric transducer has been studied theoretically. The noise parameters of the piezoelectric transducer have been computed using the fluctuation dissipation theorem and standard techniques for describing noise in linear four-pole networks. The geometrical dimensions of the piezoelectric plate necessary to ensure low intensity of the excess noise for a reactive impedance of the source have been determined.
Show AbstractSingle-electron logic elements for quantum-mechanical computers
Single-electron logic elements for quantum-mechanical computers
S.P. Vyatchanin, E.A. Zubova
An electron traveling along a bare dielectric waveguide at a velocity close to the wave phase velocity can be used to control photons in the waveguide. Two possibilities are discussed: a change in photon polarization and re-emission of a photon from one waveguide into the other. The analysis takes into account the radiation friction of an electron.
Show AbstractStudy of mechanisms of the pulse-excited fluorescence saturation in photosynthesizing organisms
Study of mechanisms of the pulse-excited fluorescence saturation in photosynthesizing organisms
A.A. Demidov, E.A. Chernyavskaya
The influence of various nonlinear effects on fluorescence saturation in photosynthesizing organisms has been studied. Approximate analytical formulas for the population of molecular excited states and the saturation factor are obtained using a photosynthetic unit model. The S-S annihilation phenomenon is shown to make the largest contribution to fluorescence saturation.
Show AbstractFrequency bias in a ring laser with an autopumping wave reflected from a moving mirror
Frequency bias in a ring laser with an autopumping wave reflected from a moving mirror
E.L. Klochan, E.G. Lariontsev, G.E. Tyul'basheva
A solid-state ring laser with an autopumping wave is considered. Part of the radiation is extracted from the laser resonator and is fed into the active medium by means of a moving mirror. It is shown that in this case the autopumping wave can be used to obtain a frequency bias in the ring laser.
Show AbstractLaws of similarity in space-time compression and dispersion broadelling of coherent and incoherent wave packets
Laws of similarity in space-time compression and dispersion broadelling of coherent and incoherent wave packets
Yu.E. Dyakov
It is established that there exists a general similarity between the "focused" pulse (the pulse that has passed through the "time" lens) and "unfocused" pulse which propagate in a linear medium with second-order dispersion. The well-known coincidence of the pulse shape in the distant zone and in the focus is a particular manifestation of this rule.
Show AbstractNonlinear interaction of long waves in shallow water
Nonlinear interaction of long waves in shallow water
S.A. Arsenyev, A.Yu. Gubar', N.K. Shelkovnikov
A nonlinear generation of harmonics due to nonlinearity in a long wave propaiating in shallow water has been considered. The Boussinesq equations taking into account friction against the bottom are solved by the asymptotic averaging method. A set of reduced equations was obtained for the amplitudes of nonlinearly interacting harmonics in a long wave depending on the distance from the coast. The set was solved by the Runge-Kutta method, and the results compared with the data of the specially designed laboratory experiment. The agreement of the calculated and observed amplitudes of the harmonics and of the fundamental wave is good. The conclusion is drawn that friction against the bottom plays an important role in the norilinear dynamics of long waves.
Show AbstractDetermination of the critical Rayleigh number under the conditions of turbulent free convection
Determination of the critical Rayleigh number under the conditions of turbulent free convection
E.P. Anisimova, I.V. Petrenko, A.A. Speranskaya
The results of experimental determination of the critical Rayleigh number characterizing the onset of the turbulent free convection regime are presented. It is demonstrated that for the developed free convection regime, in the uppermost layer of water that is cooling from the surface, the Rayleigh number is 1105. This is consistent with the theoretical value for an interfacial layer with one boundary fixed and the other free.
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