Choice of a modulating sequence for code separation of channels in the optical memory based on photon echo

The possibility of applying of phase-coded sequences in optical-memory systems based on photon echo is considered. Comparative analysis of the characteristics of the efficiency of using noise-like phase-coded signals as reference and reading excitation pulses is performed. Choice of the optimal code sequence is substantiated.     

Effect of hydroacoustic treatment on the rate of hydrolytic degradation of chitosan in acetic acid solutions

Effect of a hydroacoustic treatment in a rotary-pulsatory apparatus on the rate of hydrolytic degradation of chitosan in acetic acid solutions was studied. The influence exerted on the rate of activated hydrolysis of chitosan by its molecular weight and the process temperature was considered.     

Effect of hydroacoustic treatment on the state of aqueous solutions of sodium alginate

Effect of a hydroacoustic treatment in a rotary-pulsed apparatus on the properties of sodium alginate solutions: dynamic viscosity, intrinsic viscosity, surface tension, and optical density, was studied. The contribution of the mechanical degradation of macromolecules to the observed decrease in the viscosity of alginate solutions was determined. The effect of the ionic strength of the solutions on their stability against hydroacoustic degradation was analyzed.     

Generation of X-rays at bubble cavitation in a fast liquid jet in dielectric channels

The paper presents the results of studying the combined shock-wave radiation-emission processes associated with cavitation phenomena that occur at fast directional motion of a liquid jet into a closed working chamber through narrow dielectric channels. These processes induce high-power tunable X-ray radiation outside the chamber. At a relatively small liquid pressure, cavitation has been shown to generate shock waves in the chamber walls, which excites surface atoms and leads to the emission of X-rays from the outer surface of the chamber. At a high liquid pressure, the liquid jet does not touch the chamber walls and the cavitational shock waves lead to the excitation of the surface atoms of the jet itself accompanied by the generation of optical and X-ray radiation in the jet, which has been also observed in experiments.     

Comparative characterization of thermal isomerization rates of 6‐phenyl‐1,5‐diazabicyclo[3.1.0]hexane at convection and microwave heating

Rate constants of thermal isomerization of 6‐phenyl‐1,5‐diazabicyclo[3.1.0]hexane into 1‐(benzyl)‐4,5‐dihydro‐1H‐pyrazole at convection and microwave heating in toluene and chlorobenzene (solvents) were determined within the temperature range 90°C to 120°С. These data were used for the calculation of activation parameters of isomerization. It is shown that microwave heating increases the rate constants at the same temperature by a factor of 2 to 2.5 as compared with those using convection heating. The reason is that the effective temperature of microwave heating exceeds that of convection heating by 6°C to 9°С in toluene and by 12°C to 20°С in chlorobenzene as solvent.     

Analysis of low-frequency fluctuation of the radiation power of injection lasers

Quantum Radiophysics Division, Lebedev Physics Institute, Academy of Sciences of the USSR. Translated from Preprint No. 106 of the Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow, 1989.     

Flow-injection determination of iodide with a silver electrode

A procedure is developed for the flow-injection determination of iodide using a modified silver electrode; it extends the analytical range of iodide by an order of magnitude as compared to potentiometric determination using an iodide-selective electrode with a polycrystalline membrane. The detection limit is 7 μg/L. The procedure was used to determine iodide in natural mineral waters and model solutions. The throughput was 20–25 samples/h.     

Dynamics of 5-Aminolevulinic Acid-Induced Accumulation of Protoporphyrin IX in Three Cell Lines of Different Origin

Technical Physics - The dynamics of synthesis and accumulation of protoporphyrin IX induced by 5-aminolevulinic acid (5-ALA) was studied using confocal fluorescence microscopy in three established...     

Effect of hydroacoustic treatment on structural organization of chitosan solutions

The effect of hydroacoustic treatment in a rotary-pulsatory apparatus on the rheological, sorption, and film-forming properties of acetic acid solutions of chitosans was studied.