Time-scale invariance of relaxation processes of density fluctuation in slow neutron scattering in liquid cesium

The realization of idea of time-scale invariance for relaxation processes in liquids has been performed by the memory functions formalism. The best agreement with experimental data for the dynamic structure factor $S(k,\omega)$ of liquid cesium near melting point in the range of wave vectors (0.4 \ang^{-1} \leq k \leq 2.55 \ang^{-1}) is found with the assumption of concurrence of relaxation scales for memory functions of third and fourth orders. Spatial dispersion of the four first points in spectrum of statistical parameter of non-Markovity $\epsilon_{i}(k,\omega)$ at $i=1,2,3,4$ has allowed to reveal the non-Markov nature of collective excitations in liquid cesium, connected with long-range memory effect.Comment: REVTEX +3 ps figure

The spectrum of the non-Markovity parameter for relaxation processes in liquids

A general theory of the spectrum of the non-Markovity parameter is introduced for the detailed analysis of non-Markovian peculiarities of relaxation processes in liquids. The numerical calculations have been carried out for vibrational, dielectrical and structural relaxation. It is shown that the non-Markovian time effects play the main role in the kinetics of the relaxation processes in liquids. © 1993

Investigation of non-Markovian kinetics of microscopic vortices in liquids

The non-Markovian kinetics of microscopic vortices in liquids is studied on the basis of the memory function formalism. Numerical calculations are carried out for liquid argon. The spectrum of vortex excitations, the relaxation times, the relaxation frequencies and the parameters of non-Markovity are obtained. Our theory coincides well with the molecular dynamics data. © 1995

Synthesis, acid‒base properties, and complexing properties of N,N-bis[butoxy(hydroxy)phosphinoylmethyl]glycine

© 2017, Pleiades Publishing, Ltd. N,N-Bis(dibutoxyphosphinoylmethyl)glycine was synthesized by the Kabachnik‒Fields reaction in the three-component system glycine hydrochloride–formaldehyde–dibutyl hydrogen phosphite. Saponification of the product gave N,N-bis[butoxy(hydroxy)phosphinoylmethyl]glycine as the normal potassium salt. pH-Metric titration was used to determine the ionization constants of N,N-bis[butoxy(hydroxy)phosphinoylmethyl] -glycine, аs well as the stability constants of its Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) complexes

Quasihydrodynamic approximation for memory functions in non-Markovian relaxation processes in condensed matter

A quasihydrodynamic approximation is introduced for senior memory functions in the chain of non-Markovian kinetic equations for time correlation functions in many-body systems. This approximation allows to describe complicated high-frequency and short wavelength spectra for a wide range of phenomena: from the molecular scattering and the scattering of slow neutrons in liquids to the description of the decay of magnetic induction signal in crystals

Complexing Properties of Organophosphorus Analogs of Nitrilotriacetic Acid: Aminotris(O-alkyl methylenephosphonic Acids)

© 2018, Pleiades Publishing, Ltd. A series of tribasic aminotris(O-alkyl methylenephosphonic acids), the closest organophosphorus analogs of nitrilotriacetic acid, a widely known complexone, were synthesized. The acid‒base properties of the synthesized acids were studied, and the stability constants of their 1: 1 complexes with two-charged cations of alkaline-earth and transition metals were determined

Physical criterion of the degree of non-Markovity of relaxation processes in liquids

The microscopic parameter characterizing the degree of non-Markovity of irreversible processes is introduced. It is shown that the structure relaxation process in liquids is essentially non-Markovian in a wide range of wave vectors excluding the region near the first maximum of the static structure factor. © 1990

Transformation of non-Markovian kinetic equation for TCF to Markovian type

It is shown that the non-Markovian kinetic equation of relaxation takes on the Markovian form if the non-Markovity parameter (Phys. Lett. A148, 199 (1990)) goes to infinity

The issue of evaporation loss of oil products and possible solutions

© Research India Publications. The paper considers the issue of evaporation loss of oil products during storage, acceptance and delivery at bulk plants, fuel filling stations and oil refineries. The topicality of this issue is determined by the fact that it features both economic and environmental aspect. For example, fuel filling stations of Russia lose as the result of emission of light fractions of oil products up to 6 billion rubles per a year. Oil vapors worsen the ecological situation in large metropolises as most of fuel filling stations are located within the cities. In the real conditions hydrocarbon concentration is determined by the temperature of petroleum filled, degree and rate of reservoir filling as well as by concentration of these hydrocarbons in petroleum. The paper analyzes in details the causes and structure of hydrocarbon losses within oil products supply facilities. Comparative characteristic of the existing methods of tank vapor recovery and assessment of their efficiency are provided. Two new devices for vapor recovery during storage were proposed. It is shown that these devices allow ensuring efficient tank vapor recovery as well as improving efficiency of environmental protection at modern fuel filling complexes and bulk plants. At that gasoline quality is preserved as the result of return of light oil product fractions back to the reservoir

Time-scale invariance of relaxation processes of density fluctuation in slow neutron scattering in liquid cesium

The idea of invariance is considered for an explanation of a specific nature of high-frequency collective excitations in liquid cesium. In particular, the idea of time-scale invariance of relaxation processes in liquids is suggested. This invariance can be easily taken into account by the memory functions formalism