Analysis of the event in solar cosmic rays in June 1991 according to AES 'Granat' data
Analysis of the event in solar cosmic rays in June 1991 according to AES 'Granat' data
G.P. Lyubimov, E.E. Grigorenko
An intricate course of intensity growth in solar cosmic rays with intensities of 1-20 and more than 20 MeV has been analyzed. The event was caused by a sequence of six intense solar flares occurring in the same active region at solar latitudes from E65 to W69. This fact has determined an important role of the solar latitude effect on the propagation of solar cosmic rays and flare disturbances. The use of the "reflection" model has revealed the influence of solar flares on the modulation of solar cosmic and galactic cosmic ray streams.
Show AbstractElectron medium in a relativistic resonance surface wave generator
Electron medium in a relativistic resonance surface wave generator
V.I. Kanavets
In this paper we discuss some special features of the interaction between the electron flow and the electromagnetic field in a relativistic single-section cavity surface wave generator in the range of $\pi$- frequencies.
Show AbstractAcoustooptic interaction in media with acoustic anisotropy
Acoustooptic interaction in media with acoustic anisotropy
V.B. Voloshinov, O.Yu. Makarov
Diffraction of light by ultrasound in crystals with strongly anisotropic acoustic properties has been studied. It has been shown that acoustic anisotropy of crystals affects the acoustic frequency bandwidth of Bragg diffraction and the diffracted light intensity. Analysis of the acoustooptic interaction in gallium arsenide crystals reveals a significant change in the frequency bandwidth of diffraction for angles between the phase and group sound velocities greater than $\psi=\:$10-20$^о$ as compared to the acoustically isotropic case. The diffraction efficiency in GaAs differs from the isotropic case by more than 10%. With increasing acoustic beam walk-off, when $\psi>20$$^о$, this difference becomes even greater.
Show AbstractAnomalies of longitudinal magnetoresistivity in $n$-InSb
Anomalies of longitudinal magnetoresistivity in $n$-InSb
V.V. Ostroborodova, F. Terra Al-Saied
Ohmic $V_x$ and Hall $V_{Hy}$ potentials of InSb single crystals as functions of the angle $\alpha$ between the current $J_x$ and magnetic induction $B_{zx}$ directions at 60-350 K in magnetic fields of 0.1-20 kG have been studied. A sharp decrease in $V_x$ between the potential contacts at $\alpha$ close to 0 (180$^\circ$) have been observed in a number of samples with intrinsic and impurity $n$-type conductivity. The nature of the effect is discussed in terms of "growth" deviations from stoichiometry and by the low-resistance inclusions with $n$-type conductivity caused by them.
Show AbstractDependence of dielectric properties of polymethacrylate gels in low-polarity media on degree of ionization
Dependence of dielectric properties of polymethacrylate gels in low-polarity media on degree of ionization
N.L. Sitnikova, I.A. Malyshkina, N.D. Gavrilova, O.E. Filippova, A.R. Khokhlov
The dielectric dispersion of polymethacrylate gels with various degrees of ionization has been studied at frequencies $f$ of from 10 to 10$^5$ Hz. The permittivity of gels at low frequencies reached anomalously high values of 10$^7$-10$^8$ for gels swollen in methanol and 10$^4$ for dried gels, probably, as a result of the aggregation of ion pairs into multiplets with high polarizabilities. The $\lg\varepsilon'(f)$ curves of dried gels contained vertical shift regions evidencing the existence of ionic aggregates primarily of the same size. The ions in swollen gels occurred predominantly by ionic drift no matter what the degree of gel ionization. In dried gels, the character of ions transport changed from predominantly diffusion transport to ionic drift as the degree of ionization increased, probably, which testifies to a decrease in the distance between multiplets.
Show AbstractIron corrosion in natural anaerobic high-humidity conditions
Iron corrosion in natural anaerobic high-humidity conditions
A.A. Novakova, N.D. Manyurova, T.S. Gendler
A fragment of an archaeological iron spear extracted from an unearthing in North Osetia, where it had been exposed to soil corrosion in humid conditions for 19 centuries, has been studied for its chemical and structural composition. With the aid of a comprehensive technique involving X-ray diffraction analysis, M$\stackrel{..}{o}$ssbauer spectroscopy, and thermomagnetic analysis the following compounds have been found as the main corrosion products: superparamagnetic hoetite {$\alpha$-FeOOH), hydrohoetite {FeOOH$\cdot n$H$_2$O), and iron sulfides (pyrite FeS$_2$ and pyrrhotine Fe$_7$S$_8$).
Show AbstractOn superparamagnetic-type paraprocess
On superparamagnetic-type paraprocess
V.I. Nikolaev, T.A. Bushina, Kim Eng Chan
Distinctive features of the paraprocess in superparamagnetic particles have been explored within the formalism of the molecular field theory using Langevin's model. In particular, it has been demonstrated that at the Curie temperature and under magnetic fields $H$ not exceeding (by the order of magnitude) the "characteristic field" value $H'=kT_C/\mu_0$ (where $\mu_0$ is the particle magnetic moment at absolute saturation and $T_C$ is the Curie temperature), the magnetization of an ensemble of superparamagnetic particles is proportional to $H^3$ irrespective of the scatter of their sizes (and the moment $\mu_0$).
Show AbstractReconstruction of turbidity current velocity profile from distribution of suspended particles concentration
Reconstruction of turbidity current velocity profile from distribution of suspended particles concentration
B.I. Samolyubov, L. V. Silaeva
A technique has been developed for reconstructing the velocity profile of turbidity current from the distribution of suspended particles concentration. The reconstructed velocity profiles agree well with direct measurement data obtained in the ocean, in reservoirs, and with a laboratory model.
Show AbstractCovariant quark bag and vector anomaly
Covariant quark bag and vector anomaly
K.A. Sveshnikov, I.O. Cherednikov
An explicit covariant formalism for hybrid chiral quark bag models in 1 + 1 dimensions has been formulated. Within the suggested approach, the effect of fermionic charge flow through the interphase boundary is a direct corollary to field equations and boundary conditions.
Show AbstractAdaptive regularizing algorithms for solving ill-posed problems
Adaptive regularizing algorithms for solving ill-posed problems
A.S. Leonov$^1$, A.G. Yagola$^2$
A new class of stable methods for solving linear ill-posed problems is suggested. The methods take into account information about sourcewise representability of the sought normal pseudosolution. They are optimal in the order of accuracy and have such a special additional feature as adaptivity.
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