scholarly journals Conformational model of the dipole moment operator of a crystallizing polymer macromolecule in an inhomogeneous temperature field

2021 ◽  
pp. 22-23
Author(s):  
N. N. Matveev ◽  
V. I. Lisitsyn ◽  
V. V. Saushkin ◽  
N. S. Kamalova
Keyword(s):  
Temperature Field ◽  
Dipole Moment ◽  
Dipole Moment Operator ◽  
Polymer Macromolecule ◽  
Moment Operator ◽  
Conformational Model ◽  
Inhomogeneous Temperature ◽  
Inhomogeneous Temperature Field

scholarly journals Influence of conformations of flexible-chain polymers on changes in polarization in an inhomogeneous temperature field

2021 ◽  
pp. 44-45
Author(s):  
N. N. Matveev ◽  
V. I. Lisitsyn ◽  
V. V. Saushkin ◽  
N. S. Kamalova
Keyword(s):  
Temperature Field ◽  
Dipole Moment ◽  
Polyethylene Oxide ◽  
Structure And Properties ◽  
Flexible Chain ◽  
Modeling Methods ◽  
Inhomogeneous Temperature ◽  
Inhomogeneous Temperature Field ◽  
The Relationship ◽  
Modern Technologies

Due to the widespread use of polyethylene oxide (PEO) in modern technologies, studies of the relationship between its supramolecular structure and properties by means of modeling methods have recently intensified, but usually the conformational features of the structure of polymers are not taken into account in modeling. Using the example of PEO, the article substantiates a method for calculating the influence of the conformations of a polymer molecule on the temperature dependence of the averaged square of the dipole moment of its molecules.

Broadband EM radiation amplification by means of a monochromatically driven two-level system

2017 ◽  
Vol 31 (04) ◽  
pp. 1750027 ◽  
Author(s):  
Andrey V. Soldatov
Keyword(s):  
Dipole Moment ◽  
Quantum System ◽  
High Frequency ◽  
Laser Field ◽  
Diagonal Matrix ◽  
Matrix Elements ◽  
Level System ◽  
Dipole Moment Operator ◽  
Moment Operator ◽  
Radiation Amplification

It is shown that a two-level quantum system possessing dipole moment operator with permanent non-equal diagonal matrix elements and driven by external semiclassical monochromatic high-frequency electromagnetic (EM) (laser) field can amplify EM radiation waves of much lower frequency.

scholarly journals STABILITY OF A VISCOUS INCOMPRESSIBLE CONDUCTING LIQUID LAYER OF A CYLINDRICAL SHAPE IN AN INHOMOGENEOUS TEMPERATURE FIELD AND A MAGNETIC FIELD OF A VACUUM ARC CURRENT THROUGH IT

2021 ◽  
pp. 91-97
Author(s):  
O.L. Andrieieva ◽  
B.V. Borts ◽  
А.F. Vanzha ◽  
I.М. Korotkova ◽  
V.I. Tkachenko
Keyword(s):  
Magnetic Field ◽  
Temperature Field ◽  
External Magnetic Field ◽  
Fluid Layer ◽  
Vacuum Arc ◽  
Cylindrical Shape ◽  
Conducting Liquid ◽  
Inhomogeneous Temperature ◽  
Inhomogeneous Temperature Field ◽  
Arc Current

Convective mass transfer in a cylindrical viscous incompressible conductive fluid layer in an inhomogeneous temperature field and in the external magnetic field of the vacuum arc current through it is theoretically investigated in this work. For a horizontal layer of a viscous, incompressible, conducting liquid of a cylindrical shape, located in a temperature field inhomogeneous in height and in an external magnetic field of a vacuum arc current flowing through it, the original equations are written. These equations consist of linearized equations for small velocity perturbations, small deviations from the equilibrium values of temperature, pressure, and magnetic field strength. The considered boundary value problem is solved for the case of free boundaries. Comparison of the experimental data with theoretical calculations made it possible to determine the rotation velocity of the steel melt during vacuum arc melting.

scholarly journals Mean square of the dipole moment of a macromolecule as a function of the ordering of its monomeric units

2021 ◽  
pp. 30-33
Author(s):  
N. N. Matveev ◽  
V. I. Lisitsyn ◽  
V. V. Saushkin ◽  
N. S. Kamalova
Keyword(s):  
Temperature Field ◽  
Dipole Moment ◽  
Mean Square ◽  
Flexible Chain ◽  
External Influences ◽  
Conformational Model ◽  
The Mean

The most important information for the practical use of flexible-chain polymers is the change in structure in the presence of external influences. A conformational model for calculating the mean square of the dipole moment of a macromolecule is constructed in this work, provided that there is no correlation between the conformations of monomer units in a heterogeneous temperature field.

scholarly journals Development of unsteady boundary layers on the generatrices of a vertical silicon rod heated by electric current in the mode of conjugate radiation-convective heat transfer

2021 ◽  
Vol 2119 (1) ◽  
pp. 012163
Author(s):  
A. V. Mitina ◽  
V. S. Berdnikov ◽  
K. A. Mitin
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Convective Heat Transfer ◽  
Electric Current ◽  
Convective Heat ◽  
Longitudinal Direction ◽  
Longitudinal Distribution ◽  
Grashof Number ◽  
Inhomogeneous Temperature ◽  
Inhomogeneous Temperature Field

Abstract The nonstationary conjugate radiation-convective heat transfer of a single silicon rod heated by an electric current with the surrounding gas medium is studied numerically in the axisymmetric formulation by the finite element method. The calculations were carried out at the Prandtl number Pr = 0.68, and the range of the Grashof number, determined by the temperature difference and the radius of the rod 9 703 ≤ Gr ≤ 261 977. It is shown that after a short incubation period, a circulation flow is formed. As a result, a significantly inhomogeneous temperature field in the longitudinal direction is formed in a silicon rod heated by an electric current. As the Grashof number increases, the inhomogeneity of the longitudinal distribution of the temperature field increases.

Assessment of the Fluctuations in the Microstructural Parameters of Cellulose in Wood in an Inhomogeneous Temperature Field

2018 ◽  
Vol 45 (6) ◽  
pp. 275-278
Author(s):  
N.N. Matveev ◽  
N.S. Kamalova ◽  
N.Yu. Evsikova ◽  
A.S. Chernykh
Keyword(s):  
Temperature Field ◽  
Crystallite Size ◽  
Wood Specimen ◽  
Average Crystallite Size ◽  
Potential Difference ◽  
Microstructural Parameters ◽  
Inhomogeneous Temperature ◽  
Inhomogeneous Temperature Field ◽  
Homogeneous Temperature

The possibility of assessing the average crystallite size of cellulose in wood by formalised modelling from the magnitude of the potential difference arising in the wood specimen owing to polarisation in a non-homogeneous temperature field is considered.

Microwave Transient Phenomena of Symmetric Top Molecules. An Extended Bloch Type Description

1978 ◽  
Vol 33 (12) ◽  
pp. 1493-1497 ◽  
Author(s):  
H. Mäder ◽  
H. Bomsdorf
Keyword(s):  
Dipole Moment ◽  
Electric Dipole ◽  
Population Difference ◽  
Level System ◽  
Transient Phenomena ◽  
Dipole Moment Operator ◽  
Emission Signal ◽  
Moment Operator ◽  
Macroscopic Polarization ◽  
Symmetric Top Molecules

Abstract The Bloch equations for the macroscopic polarization components Pr and Pi and the population difference ⊿N of a two-level system are derived with inclusion of diagonal elements of the electric dipole moment operator. The influence of such elements on the solutions is discussed. The effect of Stark-switching technique on the observed transient emission signal is considered.

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