Spatial structures of phosphorus-containing heterocycles - 12. Bond polarities and conformations of the 2-dialkylamino-2-oxo-1,3,2-dioxaphosphorinanes

1. A determination has been made of the dipole moments of the phosphoryl group in the axial and equatorial chair conformations of 2-dialkylamino-2-oxo-1,3,2 -dioxaphosphorinane. 2. The phosphoryl bond has predominantly axial orientation in 2-dialkylamino-2-oxo-1,3,2-dioxaphosphorinanes. 3. A determination has been made of the preferred conformations of axial and equatorial NMe2 groups. © 1977 Plenum Publishing Corporation

Second Order Stochastic Partial Integro Differential Equations with Delay and Impulses

© Published under licence by IOP Publishing Ltd. The aerosol movement at an open end of a pipe at the resonant frequency was experimentally studied. The aerosol flow in an external wave field was visualized. The numerical value of the Rayleigh correction for an open end of an experimental plant was obtained. A good agreement between the numerical and experimental values was demonstrated

Acoustic waves in bubbly liquids for two kinds of gas bubbles with phase transitions

© Published under licence by IOP Publishing Ltd. The propagation of acoustic waves in a mixture of liquid with vapor-gas bubbles is studied. The dispersed phase consists of two fractions of the bubbles differing on gas structure and radii (a two-fractional mixture). The phase transitions take place at each of the fractions. The volume content of the bubbles is the low (about 1%). The dispersion relation, unified for plane, cylindrical and spherical waves is obtained. It is shown that a presence of the second fraction in the structure of a disperse phase of the bubbles changes significantly a dispersion and a dissipation of acoustic waves

Reflection and Transmission of Sound Waves through the Layer of Two-fractional Bubbly Liquid

© 2018 Institute of Physics Publishing. All rights reserved. The mathematical model that determines reflection and transmission of sound waves through a medium containing two-fractional bubbly liquid is presented. For the model of media with three layer the wave reflection and transmission coefficients are calculated. The influence of the volume content of bubbles on the investigated coefficients is shown

Dynamics of Waves in Multifractional Bubble Liquids

© 2017, Springer Science+Business Media, LLC, part of Springer Nature. A study has been made of pulsed waves in mixtures of a liquid and a dispersed phase consisting of vapor–gas and gas bubbles that differ in radii and thermophysical properties. A system of differential equations has been proposed for description of the motion of such a mixture and a dispersion relation has been derived for it. A comparison has been made of the dynamics of acoustic waves in mixtures of water with vapor–air bubbles, bubbles of carbon dioxide with steam, and helium bubbles, and also in monodisperse mixtures of water with bubbles of one gas. In the investigations, the qualitative composition of the dispersed phase varied due to the buildup in the volume content of the bubbles of one fraction and the relevant decrease in the content of the bubbles of the other fraction, with the total volume content of the bubbles being constant

Dynamics of pulse waves in bubble liquids: Comparison between theory and experiment

The fundamentals of mechanics and thermal physics of bubble liquids and the most essential results on studying the wave processes in such media are presented. The sample is placed in a vessel with water between an acoustic signal source (the piezoelectric converter) and a hydrophone. On the basis of the analysis of the parameters of sound waves transmitted through a sample, the data on its properties are found. Although the second condition is not completely fulfilled, the theoretical curve of the dependence of the pressure at the hydrophone on the reduced time agrees well with the experiment. Thus, the theory under consideration can be used confidently for calculation of the distortion of the acoustic signal in the diagnostics of multilayer samples with bubble inclusions

Reflection of acoustic waves from the boundary of contaminated fog

© 2018 Institute of Physics Publishing. All rights reserved. The problem of oblique incidence of an acoustic wave from pure air to the boundary of a vapor-gas mixture with droplets of liquid and solid particles is considered. Dependencies of the reflection coefficient of an acoustic wave on the volume content of inclusions and the angle of incidence of a wave are given. The influence of phase transitions is studied

Dynamics of pulse waves in bubble liquids: Comparison between theory and experiment

The fundamentals of mechanics and thermal physics of bubble liquids and the most essential results on studying the wave processes in such media are presented. The sample is placed in a vessel with water between an acoustic signal source (the piezoelectric converter) and a hydrophone. On the basis of the analysis of the parameters of sound waves transmitted through a sample, the data on its properties are found. Although the second condition is not completely fulfilled, the theoretical curve of the dependence of the pressure at the hydrophone on the reduced time agrees well with the experiment. Thus, the theory under consideration can be used confidently for calculation of the distortion of the acoustic signal in the diagnostics of multilayer samples with bubble inclusions

Weak waves in multifractional liquids with bubbles

The propagation of weak waves in multifractional mixtures of liquid with vapor-gas and gas bubbles of different sizes and different compositions with phase transitions is studied. The dispersed phase consists of N+M fractions having various gases in bubbles and different in the bubbles radii. Phase transitions accounted for N fractions. The total bubble volume concentration is small (less than 1%). The dispersion relation is derived and dispersion curves is built. Influence of the mass concentration is shown. It is shown that dispersion and dissipation of acoustic waves depends significantly on presence of different bubbles in fractions of the dispersed phase