Electron structure of beryllium oxide
Electron structure of beryllium oxide
I.V. Kityk, V.N. Kolobanov, V.V. Mikhailin
A quantitative scheme of the energy band structure is constructed by the pseudopotential method, with correction with respect to the experimental reflection spectrum of a chip of BeO single crystal in the fundamental region of the spectrum. The results are compared with known theoretical and experimental data.
Show AbstractDetermining the spectral parameters of marine waves
Determining the spectral parameters of marine waves
A.L. Kuz'minskii, V.I. Shmal'gauzen
A development of the well-known method of laser probing of the marine surface is proposed. The method developed for analyzing the map of flashing points allows the Phillips spectral parameters to be derived from six independent measurements.
Show AbstractDegree of intensity of atmospheric eddies
Degree of intensity of atmospheric eddies
A.A. Solov'ev
The problem of the relation between the pressure and wind-velocity fields in atmospheric eddies is solved. On the basis of comparison of the data of full-scale and laboratory experiments, it is proposed that a parameter relating the pressure minimum and the maximum of the surface-wind velocity be used to estimate the intensity of the eddies.
Show AbstractSpectrum of small-scale magnetic structures in the Sun
Spectrum of small-scale magnetic structures in the Sun
N.N. Kantor
Data on the mean parameters and the number of local magnetic structures (LMS) at the Sun, such as active regions, ephemeral regions, magnetic points, and magnetic elements, do not contradict the concept that the whole set of LMS is described, in a rough approximation, by a single power-law spectrum.
Show AbstractQuantum interferometer in regenerated conditions at a gravitational antenna
Quantum interferometer in regenerated conditions at a gravitational antenna
A.V. Gusev
The limiting sensitivity of a solid-state gravitational antenna with a recording element based on a radiofrequency squid is theoretically investigated, choosing a working point between adjacent plateaus. Formulas are obtained for estimating the minimum observable force determined by the thermal noise of the contact, the thermal noise of the contour, and the nonthermodynamic fluctuations of the preamplifier, with amplitude demodulation of the squid output signal. The optimal magnetomechanical coupling.coefficient is determined as a function of the parameter $g$.
Show AbstractTheory of autodyne spin generator
Theory of autodyne spin generator
Yu.S. Konstantinov
The theory of an autodyne spin generator (ASG), which is a spin generator on the side. band with modulation of the HF field, is given. In its construction, the ASG consists of a nonisochronous audyne sensor of NMR signals with a working sample in the coil of an oscillatory loop. It is shown that excitation of spin generation becomes possible as a result of mixed amplitude-frequency modulation of the autodyne oscillations, ensuring satisfaction of the condition of phase balance at near-Larmor frequencies.
Show AbstractBeam-plasma interaction in conditions of the Cherenkov collective effect
Beam-plasma interaction in conditions of the Cherenkov collective effect
A.F. Aleksandrov, M.V. Kuzelev, A.N. Khalilo
An analytical solution is given for the problem of the interaction of "thin" completely magnetized plasma and an electron beam in conditions of the collective Cherenkov effect. The saturation mechanism of the beam-plasma instability in the given conditions is elucidated.
Show AbstractMode synchronization in a continuous dye laser with a nonsteady resonator
Mode synchronization in a continuous dye laser with a nonsteady resonator
A.S. Abubakirov, N.V. Kravtsov, V.P. Protasov, V.A. Sidorov
The results of investigating a continuous jet laser based on Rhodamine 6G with a nonsteady resonator are presented. The possibility, in principle, of realizing conditions of kinematic mode stabilization is demonstrated. The basic laws determining the features of supershortpulse generation in this laser in comparison with lasers of other types are established.
Show AbstractMagnetic and M$\stackrel{..}{o}$ssbauer investigations of new antiferromagnetic compounds of $RFeGe_2O_7(R=La-Gd)$
Magnetic and M$\stackrel{..}{o}$ssbauer investigations of new antiferromagnetic compounds of $RFeGe_2O_7(R=La-Gd)$
B.V. Mill, Z.A. Kazei, S.I. Reiman, S.A. Ramazyan, F.D. Khamdamov, L.Yu. Bykova
Compounds $RFeGe_2O_7$ containing two kinds of magnetic ions - $Fe^{3+}$ and $R^{3+}$ (R = La-Gd) - are synthesized for the first time. The M$\stackrel{..}{o}$ssbauer spectra of $^{57}Fe^{3+}$ are measured, together with its magnetic and elastic properties; antiferromagnetic ordering at temperatures 5-9 K is observed. The ordering temperatures, paramagnetic temperatures, and superfine fields at $^{57}Fe^{3+}$ nuclei are determined. It is concluded that the $R^{3+}—Fe^{3+}$ interaction in these compounds is comparable with the $Fe^{3+}—Fe^{3+}$ interaction, and makes a significant contribution to the magnetic and elastic properties.
Show AbstractInfluence of $\gamma$ radiation on the specific heat and spontaneous polarization of diglycerine-nitrate crystals
Influence of $\gamma$ radiation on the specific heat and spontaneous polarization of diglycerine-nitrate crystals
B.A. Strukov, Z.V. Savilova, S.A. Taraskin
The thermal and dielectric properties of $\gamma$-irradiated diglycerine-nitrate crystals are investigated at radiation doses of 1-30 MR. The data obtained are discussed in the context of the most probable type of radiation defects.
Show Abstract