Sоmе nеw relations for the electromagnetic field tensor in pseudo-Riemannian space-time
Sоmе nеw relations for the electromagnetic field tensor in pseudo-Riemannian space-time
V.I. Grigor'ev and I.Р. Denisova
Explicit expressions for powers ofthe electromagnetic field tensor in terms ofthe three lowest powers of this tensor, the metric tensor of the pseudo-Riemannian space-time and two independent invariants of the electromagnetic field have been obtained.
Show AbstractReconstruction of electron concentration profile for plasma layers of different size from radiosonde observation data
Reconstruction of electron concentration profile for plasma layers of different size from radiosonde observation data
V.E. Kunitsyn and I.А. Nesterov
The impact ofthe layer size on the feasiЬility oflayer reconstruction is discussed. For high potentials with valleys, the reflection coefficient is shown to change abruptly within the narrow frequency intervals; outside these intervals the geometrical optics approximation is applicaЪle to а high precision. With increasing potential, the intervals width decreases rapidly (at an exponential rate), and the intervals bесоmе practically indiscernible, therefore, in actual practice, full information about the potential cannot bе obtained, which leads to an ambiguous solution of the inverse proЪlem.
Show AbstractRegularized scaling factor method for calculatiпg molecнle force fields
Regularized scaling factor method for calculatiпg molecнle force fields
I.V. Kochikov, G.M. Kuramshina, A.V. Stepanova, and A.G. Yagola
А regularizing algorithm has been implemented for calculating the force fields of polyatomic molecules. The algorithm is based on Pulay's method of scaling factors.
Show AbstractMagnetic hyperfine fields AT^181Та nuclei in the laves phases RFe_2 (R = ТЬ, Но, Уb)
Magnetic hyperfine fields AT^181Та nuclei in the laves phases RFe_2 (R = ТЬ, Но, Уb)
А.А. Sorokin, В.А. Komissarova, G.K. Ryasnyi, S.I. Reiman, L.G. Shpin'kova, A.V. Tsvyashchenko, E.N. Shirani, L.N. Fomicheva, and A.S. Deпisova
The method of ϒϒ-perturbed arigular correlations was used to measure magnetic hyperfine fields Вhf at the 181^Та nuclei in the Laves phases YbFe2, HoFe2, and TbFe2. At 300К the following Вhf(Та) values were oЬtained: 18.5 Т, 16.2 Т, and 12.1 Т, respectively. The experimental results are compared with the data obtained bу us earlier for other phases RFe2.
Show AbstractDispersion properties of planar shielded waveguides with Kerr's dielectric
Dispersion properties of planar shielded waveguides with Kerr's dielectric
A.F. Aleksandrov and V.A. Kubarev
Propagation of electromagnetic waves in waveguides completely or partially filled witli а Kerr-type medium with positive nonlinearity is considered. Dispersion relations have been obtained and dispersion characteristics have been studied. It is shown that the dependence of wave retardation on its intensity is Kerr in nature with а certain effective nonlinearity coefficient.
Show Abstractlncoherent signal accumulation in gravity-wave experiment
lncoherent signal accumulation in gravity-wave experiment
М.Р. Vinogradov, A.V. Gusev, and V.K. Milyukov
An incoherent accumulator of gravity radiation bursts has been synthesized on the basis of the generalized maximum likelihood criterion for an integrated data processing system. А technique has been developed for estimating the probability of errors of the first kind for а non-Gaussian approximation of the source statistics.
Show AbstractEffect of anti-Stokes component on tl1e gain of stimulated Rama11 scattering in plasma
Effect of anti-Stokes component on tl1e gain of stimulated Rama11 scattering in plasma
0.М. Bilak and S.Yu. Nikitin
The authors have calculated the correction to the gain of stimulated Raman scattering (SRS) in а homogeneous plasma due to the effect of the anti-Stokes scattering component. It has been shown that for conditions close to those of laser fusion synthesis this correction does not exceed а few percent and is independent of the pumping intensity.
Show AbstractNonreciprocal effects in ring Raman lasers
Nonreciprocal effects in ring Raman lasers
N.V. Kravtsov апd N.I. Naumkin
The initiation of amplitude and frequency nonreciprocity in а pulsed ring Raman laser with compressed hydrogen has been studied experimentally. The character and magnitude of nonreciprocal effects have been shown to depend on the density of radiation power in the laser resonator. The observed effects are analyzed on the assumption of spatial nonuniformity of the nonlinear medium and the formation of а wave front reversal mirror.
Show AbstractPropagation of wide-band acoustic pulses in unidirectional fibrous
Propagation of wide-band acoustic pulses in unidirectional fibrous
А.А. Karabutov, I.М. Kershtein, I.М. Pelivanov, апd N.V. Podymova
Propagation of acoustic videopulses in unidirectional fibrous graphite-epoxy composites is studied. The immersion technique with thermooptical ultrasound excitation is used. Experiments have shown that the mechanical properties of such media can bе described bу the orthotropic model. ln the frequency range of from 1 to 15 MHz, frequency dispersion of phase velocity has not been observed independently of the direction of ultrasound propagation in the composite.
Show AbstractSpin-torsional interactions in magnetic substances
Spin-torsional interactions in magnetic substances
S.A. Istomin and R.N. Kuz'min
А Lagrangian has been constructed and а system of dynamic equations has been derived that describe an elastic ferromagnet under the action of external magnetic and torsional fields. It has been shown that an external torsional field affects the mechanical state of magnetics and their magnetization. Analysis of the equations has revealed some features inherent in the spin-torsional interaction in magnetics. А feasiЬle experiment has been proposed for detecting spin-torsional interactions in magnetic substances. The range of admissiЫe values of the spin-torsional interaction constant has been estimated.
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