367 research outputs found
Distributed automatic control of technological processes in conditions of weightlessness
Some problems associated with the automatic control of liquid metal and plasma systems under conditions of weightlessness are examined, with particular reference to the problem of stability of liquid equilibrium configurations. The theoretical fundamentals of automatic control of processes in electrically conducting continuous media are outlined, and means of using electromagnetic fields for simulating technological processes in a space environment are discussed
Distribution of the Ideology of Terrorism in the Youth Environment: Modern Realities and Directions of Counteraction
This article analyzes the current practice of spreading terrorism in Russia and abroad. The causes and factors influencing the spread of the ideology of terrorism among youth are identified. It is proved that one of the main factors that influenced the spread of international terrorism was the “color revolutions” whose main actor was precisely the youth. The current trends in the development of terrorist activity and the involvement of young people in this activity are analyzed. On the basis of the analysis carried out, directions for counteracting and preventing the development of a terrorist ideology in the youth community have been proposed
Habitation layers and pedogenic processes in forest-steppe riverine valleys west of the don: the case of iIyinka
A mesolithic site with an intrusive early medieval burial at Ilyinka in the Don basin is described. On the basis of soil analysis, environment and climate are reconstructed with reference to chronology and cultural attributio
Problematic of Political Parties Conflict in the Conditions of Competitive Political Market: To the Question of Political Marketing
In this article, the authorы explores political parties in the framework of the conflictological paradigm. The researcher notes its close relationship with the paradigm of symbolic interactionism. To understand the nature of the conflict between political parties interacting in a political process, the author operationalizes key concepts and categories: competition, market and market failures, political market, competitive political process, political process, democratic process and components of the political process. As a result of the study, the authors comes to the conclusion that the conflict within the framework of political competition of parties and their interaction (transactions) has its own measure of utility. At the same time, competition and the existence of conflicts between political parties is a competitive, but largely democratic process
Long-term Dynamics of the Electron-nuclear Spin System of a Semiconductor Quantum Dot
A quasi-classical theoretical description of polarization and relaxation of
nuclear spins in a quantum dot with one resident electron is developed for
arbitrary mechanisms of electron spin polarization. The dependence of the
electron-nuclear spin dynamics on the correlation time of electron
spin precession, with frequency , in the nuclear hyperfine field is
analyzed. It is demonstrated that the highest nuclear polarization is achieved
for a correlation time close to the period of electron spin precession in the
nuclear field. For these and larger correlation times, the indirect hyperfine
field, which acts on nuclear spins, also reaches a maximum. This maximum is of
the order of the dipole-dipole magnetic field that nuclei create on each other.
This value is non-zero even if the average electron polarization vanishes. It
is shown that the transition from short correlation time to
does not affect the general structure of the equation for nuclear spin
temperature and nuclear polarization in the Knight field, but changes the
values of parameters, which now become functions of . For
correlation times larger than the precession time of nuclei in the electron
hyperfine field, it is found that three thermodynamic potentials (,
, ) characterize the polarized electron-nuclear spin
system. The values of these potentials are calculated assuming a sharp
transition from short to long correlation times, and the relaxation mechanisms
of these potentials are discussed. The relaxation of the nuclear spin potential
is simulated numerically showing that high nuclear polarization decreases
relaxation rate.Comment: RevTeX 4, 12 pages, 9 figure
Conformal Einstein equations and Cartan conformal connection
Necessary and sufficient conditions for a space-time to be conformal to an
Einstein space-time are interpreted in terms of curvature restrictions for the
corresponding Cartan conformal connection
Good Pharmacovigilance Practice in the United States and the European Union
The article presents the results of a comparative analysis of Goodpharmacovigilance practices (GVP), developed by experts of the regulatory bodiesof the European Union (EU) and the United States. It is shown that the EU GVP cover almost all possible aspects of pharmacovigilance. It is noted that the disadvantages of EU GVP are difficulties in the correct understanding and interpretation of certain definitions and processes, as well as the complexity of the implementation in practice of a number of provisions, mainly related to the organization of the quality management system, including audit and inspection. As the basis for development of the Russian Rules GVP is recommended to use the GVP E
S^1 \times S^2 as a bag membrane and its Einstein-Weyl geometry
In the hybrid skyrmion in which an Anti-de Sitter bag is imbedded into the
skyrmion configuration a S^{1}\times S^{2} membrane is lying on the
compactified spatial infinity of the bag [H. Rosu, Nuovo Cimento B 108, 313
(1993)]. The connection between the quark degrees of freedom and the mesonic
ones is made through the membrane, in a way that should still be clarified from
the standpoint of general relativity and topology. The S^1 \times S^2 membrane
as a 3-dimensional manifold is at the same time a Weyl-Einstein space. We make
here an excursion through the mathematical body of knowledge in the
differential geometry and topology of these spaces which is expected to be
useful for hadronic membranesComment: 9pp in latex, minor correction
Manipulation of the Spin Memory of Electrons in n-GaAs
We report on the optical manipulation of the electron spin relaxation time in
a GaAs based heterostructure. Experimental and theoretical study shows that the
average electron spin relaxes through hyperfine interaction with the lattice
nuclei, and that the rate can be controlled by the electron-electron
interactions. This time has been changed from 300 ns down to 5 ns by variation
of the laser frequency. This modification originates in the optically induced
depletion of n-GaAs layer
BFV-complex and higher homotopy structures
We present a connection between the BFV-complex (abbreviation for
Batalin-Fradkin-Vilkovisky complex) and the so-called strong homotopy Lie
algebroid associated to a coisotropic submanifold of a Poisson manifold. We
prove that the latter structure can be derived from the BFV-complex by means of
homotopy transfer along contractions. Consequently the BFV-complex and the
strong homotopy Lie algebroid structure are quasi-isomorphic and
control the same formal deformation problem.
However there is a gap between the non-formal information encoded in the
BFV-complex and in the strong homotopy Lie algebroid respectively. We prove
that there is a one-to-one correspondence between coisotropic submanifolds
given by graphs of sections and equivalence classes of normalized Maurer-Cartan
elemens of the BFV-complex. This does not hold if one uses the strong homotopy
Lie algebroid instead.Comment: 50 pages, 6 figures; version 4 is heavily revised and extende
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