London's limit for the lattice superconductor

A stability problem for the current state of the strong coupling superconductor has been considered within the lattice Ginzburg-Landau model. The critical current problem for a thin superconductor film is solved within the London limit taking into account the crystal lattice symmetry. The current dependence on the order parameter modulus is computed for the superconductor film for various coupling parameter magnitudes. The field penetration problem is shown to be described in this case by the one-dimensional sine-Gordon equation. The field distribution around the vortex is described at the same time by the two-dimensional elliptic sine-Gordon equation.Comment: 7 pages, 3 figures, Revtex4, mostly technical correction; extended abstrac

Automation of monitoring in gas producing company

Specific character of monitoring in gas producing company has been considered. Corporate geoinformation system «Magistral-Vostok» for controlling gas producing enterprises was suggested, the experience of this system introduction in «Vostokgasprom» was describe

Optical absorption and activated transport in polaronic systems

We present exact results for the optical response in the one-dimensional Holstein model. In particular, by means of a refined kernel polynomial method, we calculate the ac and dc electrical conductivities at finite temperatures for a wide parameter range of electron phonon interaction. We analyze the deviations from the results of standard small polaron theory in the intermediate coupling regime and discuss non-adiabaticity effects in detail.Comment: 7 pages, 8 figure

Electron Localization in the Insulating State

The insulating state of matter is characterized by the excitation spectrum, but also by qualitative features of the electronic ground state. The insulating ground wavefunction in fact: (i) sustains macroscopic polarization, and (ii) is localized. We give a sharp definition of the latter concept, and we show how the two basic features stem from essentially the same formalism. Our approach to localization is exemplified by means of a two--band Hubbard model in one dimension. In the noninteracting limit the wavefunction localization is measured by the spread of the Wannier orbitals.Comment: 5 pages including 3 figures, submitted to PR

Charge transfer and coherence dynamics of tunnelling system coupled to a harmonic oscillator

We study the transition probability and coherence of a two-site system, interacting with an oscillator. Both properties depend on the initial preparation. The oscillator is prepared in a thermal state and, even though it cannot be considered as an extended bath, it produces decoherence because of the large number of states involved in the dynamics. In the case in which the oscillator is intially displaced a coherent dynamics of change entangled with oscillator modes takes place. Coherency is however degraded as far as the oscillator mass increases producing a increasingly large recoherence time. Calculations are carried on by exact diagonalization and compared with two semiclassical approximations. The role of the quantum effects are highlighted in the long-time dynamics, where semiclassical approaches give rise to a dissipative behaviour. Moreover, we find that the oscillator dynamics has to be taken into account, even in a semiclassical approximation, in order to reproduce a thermally activated enhancement of the transition probability

Comment on `Dynamical properties of small polarons'

We show that the conclusion on the breakdown of the standard small polaron theory made recently by E.V. deMello and J. Ranninger (Phys. Rev. B 55, 14872 (1997)) is a result of an incorrect interpretation of the electronic and vibronic energy levels of the two-site Holstein model. The small polaron theory, when properly applied, agrees well with the numerical results of these authors. Also we show that their attempt to connect the properties of the calculated correlation functions with the features of the intersite electron hopping is unsuccessful.Comment: To appear in Phys. Rev.

Cognitive Attitudes and Biases of Victim Mentality

Received December 22, 2020. Accepted December 16, 2021. Published online December 30, 2021.The research analyses cognitive attitudes and biases in people with victim mentality. The hypothesis that the study aims to test is that there is a correlation between the level of victimhood and the cognitive attitudes and biases that determine victim behaviour. Methodologically, the study relies on a range of tools, including the questionnaire “Predisposition to Victim Behaviour”, the Victim Mentality Questionnaire, the Dysfunctional Attitudes Scale and the adjusted REBT-test (rational emotive behaviour therapy). The study was conducted in 2018 in Russia and covered a sample of 106 people: 45 male and 61 female respondents aged 20–29. The hypothesis was confirmed and correlations were found between the type of victim behaviour, victim mentality, dysfunctional attitudes and irrational beliefs. Irrational beliefs are thus considered as victimogenic determinants correlating with the level of victimhood and forms of victim behaviour. These findings can be used to develop preventive and therapeutic strategies to help patients suffering from victim mentality and related problems

Modifying the surface electronic properties of YBa2Cu3O7-delta with cryogenic scanning probe microscopy

We report the results of a cryogenic study of the modification of YBa2Cu3O7-delta surface electronic properties with the probe of a scanning tunneling microscope (STM). A negative voltage applied to the sample during STM tunneling is found to modify locally the conductance of the native degraded surface layer. When the degraded layer is removed by etching, the effect disappears. An additional surface effect is identified using Scanning Kelvin Probe Microscopy in combination with STM. We observe reversible surface charging for both etched and unetched samples, indicating the presence of a defect layer even on a surface never exposed to air.Comment: 6 pages, 4 figures. To appear in Superconductor Science and Technolog

Spin-orbit Hanle effect in high-mobility quantum wells

We study the depolarization of optically oriented electrons in quantum wells subjected to an in-plane magnetic field and show that the Hanle curve drastically depends on the carrier mobility. In low-mobility structures, the Hanle curve is described by a Lorentzian with the width determined by the effective g-factor and the spin lifetime. In contrast, the magnetic field dependence of spin polarization in high-mobility quantum wells is nonmonotonic: The spin polarization rises with the magnetic field induction at small fields, reaches maximum and then decreases. We show that the position of the Hanle curve maximum can be used to directly measure the spin-orbit Rashba/Dresselhaus magnetic field.Comment: 4 pages, 3 figure

The role of persistence in students’ self-realization

The paper analyzes the results of an empirical research obtained with the help of a sample of students. The research of persistence was carried out within the framework of the dispositional concept of personality traits and individuality by A. I. Krupnov. The techniques developed by A. I. Krupnov as well as the author’s test of persistence were used in the study. After allocating the levels of persistence, the features of self-realization were analyzed in each group of the respondents. The specificity of self-realization was revealed in the context of the author’s polysystemic concept, the author’s multidimensional questionnaire on personality’s self-realization (MQPSR) was used as a diagnostic tool. The empirical study revealed statistically significant differences in the specifics of self-realization of the students with different levels of persistence manifestation. The respondents with a high level of persistence realize themselves more successfully in different spheres of life due to the obvious active behaviour, optimistic attitude, high motivation, creative methods and techniques of self-expression, internal self-regulation and constructive behavior. The students with low persistence lack successful self-realization because of passivity, pessimism, external locus of self-control, a high level of barriers and standard simple schemes of self-expression