Rеsопапсе iпteractioп of electroп waves апd а damped backward wave iп а periodic waveguide
Rеsопапсе iпteractioп of electroп waves апd а damped backward wave iп а periodic waveguide
V.I. Kaпavets
The features of interaction between the electron stream waves and а backward wave in а periodic lossy waveguide for а critical coupling at frequencies of the transparency band boundary are discussed.
Show AbstractЭкспериментальное изучение влияния полимера полиэтиленоксида на гидродинамическое сопротивление и структуру потока
Экспериментальное изучение влияния полимера полиэтиленоксида на гидродинамическое сопротивление и структуру потока
М.С. Полякова, М.А. Сенашенко
Методом лазерной доплеровской анемометрии исследовались профили скорости с различных сечениях трубок со стенозом для растворов с полимером и без него. Показано, что введение полимера уменьшает градиент скорости как вдоль потока, так и в поперечном сечении трубки. Одновременно методом, использующим гибкую мембрану, измерялся перепад давлений и вычислялся коэффициент сопротивления трубок. Доказано, что уменьшение сопротивления при введении полимера связано с изменением структуры потока.
Show AbstractFinsleria extension of scalar products
Finsleria extension of scalar products
G.S. Asanov
Explicit expressions have been given for the Finslerian invariant scalar products of four-dimensional momenta and radius-vectors.
Show AbstractThe method of projection operators in correlation NMR spectroscopy
The method of projection operators in correlation NMR spectroscopy
V.S. Тumanov
General formulas for frequencies, intensities, and phase factors of two-dimensional first-order spectra in correlation spectroscopy of nuclear magnetic resonance for pulsed proccsses $(\pi/2)_x-t_1-(\pi/2)_x – t_2$ have bееn oЪtained.
Show AbstractOn Schrodinger uncertainty relation
On Schrodinger uncertainty relation
Yu.I. Vorontsov
The special features of states when the Schrodinger uncertainty relation $\Delta^2A\Delta^2B\ge(\hbar^2/4)|\langle C\rangle|^2/(1-r^2)$ $(\hat{C}=[\hat{A},\hat{B}]/i\hbar$ i1i and r is the correlation coefficient between А and В) turns into the equality have been examined. It has been shown that if, indcpendently of state, we can obtain (С) = О bу changing the point of reference, then the state $|\Psi\rangle$, for which the Schrodinger relation is the equality, is an eigenstate of the operator А or В and does not correspond to an analytical solution of the equation $\hat{A}=\hat{p}^2,$ $\hat{B}=\hat{x}$, whcre а: is а c-number. It was demonstrated that for $\hat{A}=\hat{p}^2, and $\hat{B}=\hat{x}$, the state, when the equality $\Delta^2 p^2\Delta^2 x^2=(\hbar^2/4)|\langle \hat{p}\rangle|^2$ holds asymptotically, can bе considered as the limit of the Gaussian state when $\Delta p \to 0$.
Show AbstractAnnihilation of $e^+e^-$ pair iпto hadroпs iп а model chromomagпetic field of the gluon vacuum condensate.
Annihilation of $e^+e^-$ pair iпto hadroпs iп а model chromomagпetic field of the gluon vacuum condensate.
V.Ch. Zhukovsky, А.Е. Grigoruk and I.V. Mamsurov
The process of quark-antiquark pair production Ьу а massive photon in constant chromomagnetic fields that model the gluon condensate field has been considered. Pair production thresholds have been revealed and the pair production rate as а function of the field condensate strength has been calculated. The contribution of the gluon condensate to the cross section of the quark pair production in the case of comparatively weak fields at large energies of the $e^+e^-$ pair has been estimated. The nonanalytical dependence of the cross section on the condensate field, which reveals itself near the quark pair production thresholds, has been demonstrated.
Show AbstractPhotoproductioп of an axion on an electroп iп ап exterпal magпetic field (Comptoп mechaпism)
Photoproductioп of an axion on an electroп iп ап exterпal magпetic field (Comptoп mechaпism)
А.V. Borisov and V.Yu. Grishiпa
The cross section for the reaction $\gamma+e\to e+a$ on polarized relativistic electrons in а constant magnetic field in the framework of а model with а tree-level axion-electron coupling has been calculated. The dependence of the form of the spectrum and of the total cross section on invariant kinematic and dynamic paramcters dctermiпed bу the particlc encrgies and the external field strength has been studied.
Show AbstractWave fuпctioп iп а quaпtum system with memory
Wave fuпctioп iп а quaпtum system with memory
D.А. Slavпov
In the framework of а quantum model with memory а relation between а wave function of а quantum object and the information stored in its memory is established. On this basis two reasons (objective and subjective) for the wave function to collapse are revealed. The conclusions are illustrated bу the analysis of the Einstein-Podolsky-Rosen paradox.
Show AbstractLow-frequency equivalent of а parametric electrodyпamic transducer
Low-frequency equivalent of а parametric electrodyпamic transducer
А.V. Gusev
The feasibility of synthesizing а low-frequency sensitivity equivalent of а parametric electrodynamic transducer is discussed. А linear two-terminal network with constant parameters and appropriate noise generators is such an equivalent. Formulas for calculating thc energy spectra of such sources have been obtai11ed.
Show AbstractQuasi-collinear light diffraction оп ultrasound
Quasi-collinear light diffraction оп ultrasound
V.N. Paryghin аnd А.V. Vershubskii
А system of equations has been derived, which describes the quasi-collinear acoustooptic interaction and relates the Fourier spectra of the amplitudes of transmitted and diffracted light beams for the case of their propagation in an anisotropic medium with walk-off of the acoustic energy. The solution of these equations with the corresponding boundary conditions provides а picture of the efficicncy of quasi-collinear diffraction under tl1e conditions of strong interaction.
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