Time Reversal and Tomographic Representation for Signal Processing in Living Systems

The tomographic representation for signal processing opens new opportunities for studies of living system signals. Some signals can be described by functions of time f(t), which are approximately connected with each other by reversing of time. In this case, there is a possibility to observe transformation of tomograms for such functions. We obtain the correspondence of tomograms for functions f(t) and f(?t) in the vicinity of the frequency scale and illustrate by the examples of electric impedance of rat femoral artery pulsing in two different modes. We show that the use of a reference signal for signal processing of living systems provides new opportunities for employing both – their standard Fourier transforms and tomograms – to obtain new additional and useful information.

     

Mechanisms of the destruction of micron conductors by an electromagnetic pulse with a subnanosecond front

The results of the experiments on the destruction of micron-diameter conductors by an electromagnetic pulse, which is generated in an inhomogeneous coaxial line by a high-voltage power source and has a subnanosecond front, are reported. The role of electrodynamic processes in the surface layer of microconductors and in environment in the formation of the spatial structure of the plasma channel and in the transformation of the energy of the source to the energy of radiation has been revealed. The spectral characteristics of the radiation of the plasma channel have been analyzed. It has been shown that the radiation spectrum at the time of the formation of the plasma corona is continuous. The most intense spectral lines of copper (510.554, 515.324, 521.82 nm) appear at ∼3 ns after the formation of the plasma corona. The temperature has been estimated from the ratio of the intensities of the spectral lines as T _e ∼ 0.7 eV.     

Effect of the solar wind on the formation of a photoinduced dusty plasma layer near the surface of the Moon

A dusty plasma layer formed near the illuminated part of the surface of the Moon under the action of ultraviolet radiation, as well as fast and slow solar wind, has been numerically simulated. The numerical calculations including the photoemission properties of lunar regolith samples delivered to the Earth have been compared to estimates within known theoretical models. It has been shown that the flux of solar wind particles plays an important role in the formation of the surface photoelectron layer. The conditions of the charging and stable levitation of dust particles in the surface plasma layer of the Moon have been analyzed.     

Zur Frage nach der Aktivität der tertiären Amine in der Reaktion der Polyurethanbildung

Ohne Zusammenfassung     

Sigma model for Ernst equation: Lax representation,Bäcklund transformation and divergence-free currents

A sigma model associated with the Ernst equation is derived. This sigma model is described by the Belinsky-Zakharov-type completely integrable equation and is formally equivalent to the usual sigma model in curved two-dimensional space. The corresponding Lax representation, BÄcklund transformation, and divergence-free currents are obtained.     

Poisson's ratio of foamed plastics

Six-sided and 14-sided cell models are used as a basis for calculating the Poisson ratio of foamed plastics as a function of the properties of the polymer base and the parameters of the cellular structure. The extremal nature of the dependence of the Poisson ratio on the apparent density of foamed plastics is established and explained.Vladimir Scientific-Research Institute of Synthetic Resins. Translated from Mekhanika Polimerov, No. 1, pp. 45–49, January–February, 1973.     

Influence of geographic populations on the elemental composition of pine phytomass and soil

In the long-term (30 years) field provenance experiment (Novosibirsk, Russia) with Scotch pine Pinus sylvestris L. from different geographical populations, X-ray fluorescence analysis with synchrotron radiation (XRFSRA) was used to estimate the concentration of 16 chemical elements in different components of the phytomass collected from living trees and the soil under them. The statistically significant influence of the “geographical population” factor on the elemental composition of different components of phytomass and soil was shown. A relationship between chemical properties and morphometric traits was found.