Recurrence quantification analysis of electrostatic fluctuations in fusion plasmas

We have investigated plasma turbulence at the edge of a tokamak plasma using data from electrostatic potential fluctuations measured in the Brazilian tokamak TCABR. Recurrence quantification analysis has been used to provide diagnostics of the deterministic content of the series. We have focused our analysis on the radial dependence of potential fluctuations and their characterization by recurrence-based diagnostics. Our main result is that the deterministic content of the experimental signals is most pronounced at the external part of the plasma column just before the plasma radius. Since the chaoticity of the signals follows the same trend, we have concluded that the electrostatic plasma turbulence at the tokamak plasma edge can be partially explained by means of a deterministic nonlinear system.     

Nonlinear Wave and Cavitation Processes and Their Effect on the Mechanical Properties of Viscous Solutions

Doklady Physics - This paper presents the experimental results of studying the effect of nonlinear wave and cavitation processes occurring in the working elements of a flow in hydrodynamic vortex-...     

Study of the High-Resolution Fourier Spectrum of the ν9 and ν2 + ν7 + ν8 Bands of the С2D4 Molecule

Russian Physics Journal - Fourier spectra of the C2D4 molecule in the region 2250–3040 cm–1, in which the fundamental ν9 band and the combinational ν2 + ν7 + ν8 band...     

Sound Pressure Interference and Phase Velocities in Shallow Water: Calculation and Experiment

Acoustical Physics - A study was carried out on the interference structure of sound pressure amplitudes, longitudinal projections of phase gradients, and calculated phase velocities in a...     

Resonance Assisted Chalcogen Bonding as a New Synthon in the Design of Dyes

Intramolecular chalcogen bonding in arylhydrazones of sulfamethizole is strengthened by conjugation in the π-system of a noncovalent five-membered ring. The S⋅⋅⋅O distance in the sulfamethizole moiety of these compounds ranges from 2.698(3) to 2.806(15) Å, which indicates its strong dependence on the attached arylhydrazone fragments. Information on the nature of the intramolecular chalcogen bond was afforded by DFT calculations.     

Use of Alternating-Current Plasma Torch for Processing Potentially Hazardous Substances

The decomposition of tetrachloromethane and tetrafluoromethane by air plasma in the presence of methane has been studied using an ac plasma torch of up to 500 kW power with rail electrodes. Methane reacts with air in the partial oxidation mode to form hydrogen, which reacts with a halogen to produce the hydrogen halide.     

Synthesis of N,N′-di(1-adamantyl)bispidin-9-ones

Russian Chemical Bulletin - The condensation product of adamantan-1-amine with formaldehyde, 1,3,5-tri(1-adamantyl)-1,3,5-triazacyclohexane, was treated with three different types of ketones:...     

Hydrogen diffusion in titanium at room temperature

The diffusion of hydrogen in technically pure VT1-00 titanium is studied at room temperature under conditions of hydrogen penetration from a glow discharge plasma. Hydrogen penetration occurs under conditions of hydride phase growth. The diffusion coefficients of hydrogen in titanium at room temperature are estimated.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 43–47, March, 1982.     

Acousto-optic stabilization of the intensity of a laser beam

A system for stabilization of the intensity of a laser beam based on an acousto-optic modulator is theoretically and experimentally studied. An equation that describes dynamic processes in the system and various working regimes is derived. It is demonstrated that the stabilization coefficient depends on the transfer coefficient of the feedback circuit and the position of the working point on the amplitude characteristic of the acoustooptic interaction. An experimental prototype of the stabilization system is based on a paratellurite acousto-optic cell. The system stabilizes the intensity with a coefficient of 78 in a frequency band of 15–180 Hz.