High-order synchronization of stick–slip process: experiments on spring–slider system

In the last years it has been shown that the synchronization and triggering of dynamic events by weak external forcing is ubiquitous and is observed in biological systems, lasers, electronic networks, etc. In the present paper, new experimental data on the phase synchronization in frictional system induced by a weak electromagnetic or mechanical periodic forcing are analyzed. For quantitative analysis of stick–slip time series, modern tools of nonlinear dynamics were used. Stick–slip events were identified by recording acoustic emissions, which accompany slip displacements. The spring–slider system in stick–slip regime is considered as a proxy of active tectonic fault, generating earthquakes. The effect of high-order synchronization of stick–slip events by weak electromagnetic or mechanical periodic forcing, as well as the phenomenon of phase time delay of the synchronized slip events behind the forcing phase, was discovered. These findings can help to find new regularities in seismic time series.     

Effect of electron irradiation of ZnGeP2 single crystals on terahertz losses in a wide temperature range

Physics of the Solid State - The reflection and transmission spectra of ZnGeP2 single crystals irradiated with 4-MeV electrons have been measured in the frequency range of 5-5000 cm−1 at...     

The effect of target texture and topography on the spatial distribution of material sputtered from tungsten

The spatial distributions of sputtered particles have been investigated both experimentally and by computer simulation using the TRIM.SP code for 30 keV argon-ion bombardment of tungsten in a wide range of primary-ion incidence angles (0°–80°). Two sets of the targets were used. One of them was prepared from fine-grained polycrystalline ingot, another one from rolled sheet W. It was found that the experimental results for these targets were different. For rolled tungsten a typical Wehner-spot picture, although smeared, is observed. For fine-grained tungsten the sputtered particle spatial distributions are practically cupola-shaped. Some differences between the experimental results and computer-simulation data can be attributed to the effect of surface topography either initial or developed during the ion bombardment.     

Radiation of relativistic dipoles. I

In the proposed series of articles, a systematic exposition will be given of the classical theory of radiation of relativistic point dipoles. Specific examples of radiation having practical significance will also be considered. V. V. Kuibyshev Tomsk State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 60–64, February, 1993.     

Use of 1-Halo Derivatives of the 2,2,6,6-Tetramethylpiperidine Series as Oxidants and Halogenating Agents

1-Halo derivatives of the 2,2,6,6-tetramethylpiperidine series oxidize sterically hindered phenols to form dimers and p-quinones.     

Structural deformation and fracture levels of polycrystals under different kinds of loading

Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 69–88, February, 1990.