A collinear acoustooptical filter with the Ganssian light and sound beams
A collinear acoustooptical filter with the Ganssian light and sound beams
V.N. Parygin, I.N. Zhmakin, O.I. Medvedkov
The performance of a collinear acoustooptical filter is theoretically analyzed with consideration for diffraction-induced divergence between the light and the acoustic beams. The effect of beam divergence on the transmission band and on the number of optical image elements that can be studied with the aid of the filter is described. The parameters needed for an optimal performance of the filter are determined.
Show AbstractA nonlinear Langmuir wave: kinetic theory and asymptotics
A nonlinear Langmuir wave: kinetic theory and asymptotics
A.N. Gaponenko, L.S. Kuz'menkov, 0.0. Trubachev
The behavior of the nonlinear frequency shift and the amplitudes of the second and third harmonics have been studied numerically in the cubic approximation with respect to the wave field for the relativistic Maxwell plasma. The range of applicability of low-temperature asymptotics is indicated for quantities under study. It is found that for waves with a phase velocity close to the velocity of light a good approximation is given by cold hydrodynamics.
Show AbstractTransformation of longitudinal wave video pulses into shear waves in passing through the liquid-solid interface
Transformation of longitudinal wave video pulses into shear waves in passing through the liquid-solid interface
A.A. Karabutov, M.P. Matrosov, N.B. Podymova
An experimental study of the transformation of a video pulse of longitudinal waves with a planar phase front into shear waves at the liquid-solid interface is reported. Longitudinal wave pulses from standard laser sound sources had mono- and bipolar shapes in the spectral range of 1 to 70 MHz. Shear wave pulses with a planar phase front and linear polarization were detected in the spectral range of 1 to 15 MHz.
Show AbstractOn the evaluation of the perturbing body mass and its depth of occurrence by the vertical gravity gradient
On the evaluation of the perturbing body mass and its depth of occurrence by the vertical gravity gradient
Tran Van Nhac
A method is proposed for the evaluation of the localization depth and the magnitude of a mass from the values of anomalies and the vertical gravity gradient. A function which depends on the distance to the perturbing mass is introduced, and the mass and its depth of occurrence are evaluated.
Show AbstractRelativistic satellite problem with regard for galactic rotation
Relativistic satellite problem with regard for galactic rotation
A.A. Vlasov
It is shown that the equations of satellite motion in the solar system with consideration for its galactic rotation make it possible, in the reference frame of local geocentric observer, to reveal the effects induced by the galactic rotation.
Show AbstractOptimal light to the libration point $L_3$ of the Earth-Moon system in the context of restricted elliptical three-body problem
Optimal light to the libration point $L_3$ of the Earth-Moon system in the context of restricted elliptical three-body problem
I.Zh. Zuiko, L.G. Luk'yanov, I.A. Subaev
An optimal two-pulse flight to the $L_3$ libration point of the Earth-Moon system is studied in the context of planar restricted elliptical three-body problem with the use of asymptotic trajectories. The minimum energy requirements for this transfer and the value of the parameter $v$ (true anomaly of the Moon) characterizing the asymptotic trajectory are determined.
Show AbstractTransformation of the $Gd_xCe_{1-x}MnSi$ magnetic phase diagram induced by hydrostatic pressure
Transformation of the $Gd_xCe_{1-x}MnSi$ magnetic phase diagram induced by hydrostatic pressure
S.A. Nikitin, Yu.I. Spichkin, A.M. Tuhin
Experimental data have been used to build and analyze magnetic phase diagrams of $Gd_xCe_{1-x}MnSi$. Pressures of about 8-10 kbar have been found to induce antiferromagnetic ordering within the Mn sublattice for all the compounds studied. The results obtained are discussed on the assumption that the exchange interaction inside the ferromagnetically ordered layers prevails over the interlayer exchange interaction.
Show AbstractThe magnetic properties and structure of $SmFe_{11-x}Co_xTi$ compounds
The magnetic properties and structure of $SmFe_{11-x}Co_xTi$ compounds
0.A. Zolotukhin, V.V. Zubenko, T.L Ivsnova, S.A. Nikitin, V.V. Sergeev, I.V. Telegina, I.S. Tereshina
The crystal structure, phase composition, and magnetic properties of $SmFe_{11-x}Co_xTi$ compounds (x = 0, 1, 2, 3, 5) were studied. The temperature dependence of magnutization, the Curie temperature $Т_с$ and the saturation magnetization were determined for single crystals prepared from ingots of $SmFe_{11-x}Co_xTi$ alloys. Uniaxial magnetic anisotropy constants were estimated by the torque method. It was found that $SmFe_{11-x}Co_xTi$ compounds have high magnetic energy, saturation magnetization and magnetic anisotropy. It was also found that the Curie temperature grows drastically as cobalt is substituted for iron and reaches the level of $Т_с = 960$ К for $SmFe_6Co_5Ti$, which provides increased thermal stability of these alloys.
Show AbstractCertain aspects of decomposition of polyatomic organic molecules stimulated by charge exchange with ions
Certain aspects of decomposition of polyatomic organic molecules stimulated by charge exchange with ions
M.B. Guseva, P.V. Shibaev, B.M. Kostishko, Ye.A. Osherovich, M.E. Timofeeva
A new model of decomposition of polyatomic molecules upon interaction with inert gas ions is proposed. The criterion of molecular bond breakage is the amount by which the bonding energy changes as a result of charge exchange between the ion and the molecule.
Show AbstractStrongly nonlinear stationary waves in the ultrarelativistic and the Fermi plasma
Strongly nonlinear stationary waves in the ultrarelativistic and the Fermi plasma
I.M. Aleshin, L.S. Kuz'menkov
Waves of arbitrary amplitude in the Fermi and the ultrarelativistic plasma are considered. In contrast to the linear theory, the properties of waves of finite amplitude in these media possess some substantial distinctions.
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