Diagnostics of plasma in а low-pressure surfatron from radial SHF field distribution
Diagnostics of plasma in а low-pressure surfatron from radial SHF field distribution
S.Е. Bobkov, Р.S. Bulkin, G.S. Solntsev, and L.I. Tsvetkova
The possibility of determining electron concentration n from the radial distribution of the amplitudes of the field components $Е_{r}(r), E_{z}(r), H_\phi(r)$ of а surface electromagnetic wave in а surfatron is examined. U se is made of а plasma waveguide model taking into account tube walls. Of three types of electromagnetic probes, the one recording $Е_{r}(r)$ gives the best results. Nonlinear effects caused bу the influence of probes on the discharge are observed at small probe-tube distances.
Show AbstractMutual influence of diffraction-coupled lasers in а Talbot resonator
Mutual influence of diffraction-coupled lasers in а Talbot resonator
V.Р. Kandidov and I.V. Pashkova
The amplitude and phase relationships between the fields which form а diffraction coupling are studied as functions of the filling factor of the waveguide array. It is shown that а periodic field is formed in а Talbot resonator as а result of interference of the fields of individual waveguides which sets in at certain amplitude and phase relationships in the plane of their apertures.
Show AbstractThe influence of cuЬic anisotropy on the domain structure of ferromagnetic films
The influence of cuЬic anisotropy on the domain structure of ferromagnetic films
L.I. A.ntonov, Е.А. Mukhina, and Е.V. Lukasheva
The problem of the periodic structure of magnetization of а ferromagnetic singlecrystal film with cuЬic anisotropy has been numerically solved. The computation results are illustrated bу the magnetization distributions of two films with parameters chosen to demonstrate the special features of the film domain structures.
Show AbstractX-Ray and Mossbauer studies of the Mn2.75Fe0.25Al alloy isostructural to β-Мn
X-Ray and Mossbauer studies of the Mn2.75Fe0.25Al alloy isostructural to β-Мn
А.S. Vinogradova, V.S. Zasimov, А.S. Ilyushin, I.А. Nikanorova, and I.S. Nikanorov
А combined X-ray and Mossbauer study revealed local dist1·ibutions of iron and aluminum atoms in $\beta —Mn_{2,75}Fe_{0,25}Al$ after various types of thermal treatment
Show AbstractThe magnetic properties of $SmFe_{11-x}Co_{x}Ti$ single crystals
The magnetic properties of $SmFe_{11-x}Co_{x}Ti$ single crystals
S.А. Nikitin, I.S. Tereshina, Т.I. Ivanova, and Yu.F. Popov
The effect of substituting atoms of Со for Fe on the magnetic properties of $SmFe_{11-x}Co_{x}Ti (x=0, 1, 2, ..., 6)$ single crystals in pulsed magnetic fields up to 120 kOe at temperatures of 4.2 to 300 К was studied. The concentration dependences of the magnetic anisotropy constants $К_1$ and $К_2$ and anisotropy fields $H_a$ were de_termined. Magnetic phase transitions induced Ьу an applied field were observed.
Show AbstractObservations of the Earth's deformation spectrum bу means of а laser interferometer-deformograph
Observations of the Earth's deformation spectrum bу means of а laser interferometer-deformograph
V.К. Milyukov and V.К. Kravchuk
Long-term observations of lithospheric deformations were car1·ied out in the frequency range of $5\cdot 10^{-6}$ to 103 Hz in the Northern Caucasus at the Baksan Geophysical Observatory (Shternberg Institute of Astronomy). Observations were made Ьу means of an underground laser interferometer-deformograph with а baseline of 75 m. The obtained estimate of the spectral density of deformations determines the background level of seismic noise over а wide frequency range.
Show AbstractThe secular drift of the Earth's center of mass caused Ьу movements of lithospheric plates
The secular drift of the Earth's center of mass caused Ьу movements of lithospheric plates
Yu.V. Barkin
The paper is concerned with the study of а subtle geodynamic phenomenonthe secular movement of the Earth's center of mass caused Ьу movements of lithospheric plates. Based on the plate model adopted, it is shown that in this epoch the Earth's center of mass is being displaced relative to the mantle in the direction of а point with the geographic coordinates ip = 42.3° N .L. and $\lambda=131,2°$ E.L. (toward the Sea of Japan) at а rate vc· = 4.45 cm/century. The phenomenon is primarily due to the underthrust effect of oceanic plates.
Show AbstractOn the problem of calculating dielectric waveguides
On the problem of calculating dielectric waveguides
А.N. Bogolyubov and А.V. Krasil'nikova
We propose а modification of an algorithm for а self-regulating net that enaЬles one to calculate efficiently the spectral characteristics of dieiectric waveguides with complex filling, and also а new method of calculating the cutoff frequencies for these waveguides.
Show AbstractCalculation of oscillations of nonuniform plates under local influences
Calculation of oscillations of nonuniform plates under local influences
G.N. Medvedev, В.I. Morgunov
Steady-state oscillatory modes of nonuniform plate~ are considered in the presence of external perturbations. The perturbations are periodic in time and localized in а small circular region. The averaging procedure is used to asymptotically determine the displacement vector.
Show AbstractThe effect of absorption on radio wave reflection bу the ionosphere for slant proЬing
The effect of absorption on radio wave reflection bу the ionosphere for slant proЬing
V.D. Gusev, Е.G. Mikhailova, and L.I. Prikhod'ko
The rigorous solution to the problem of radio wave propagation in а nonuniform ionospheric layer with а linear profile of permittivity and absorption is considered. The exact solution is oЬtained for the complex reflectivity of the layer. It is shown that, even for а low absorption, the attenuation of radio waves in the layer can Ье quite strong, while reflection is virtually absent.
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