90 research outputs found
Investigation the role of religious organizations in system of general education: forms of state- confessional interaction
The purpose of the this was aimed at conducting a system analysis of the forms of interaction between religious organizations and modern states implementing the secular model regarding the regulation of religion component in the field of general educatio
Functional self-limitation of state authority
Based on the analytical and synthesis study of a wide range of published documentary sources, the article presents the authors’ approach to the issue of self-restriction of state power. It is concluded that, in the considered context of the Russian Federation, the problem of the constant and continuous improvement of the system of separation of state power often seems to manifest itself satisfactoril
Effects of Disorder and Interactions in the Quantum Hall Ferromagnet
This work treats the effects of disorder and interactions in a quantum Hall
ferromagnet, which is realized in a two-dimensional electron gas (2DEG) in a
perpendicular magnetic field at Landau level filling factor equal one. We study
the problem by projecting the original fermionic Hamiltonian into magnon
states, which behave as bosons in the vicinity of the ferromagnetic ground
state. The approach permits the reformulation of a strongly interacting model
into a non-interacting one. The latter is a non-perturbative scheme that
consists in treating the two-particle neutral excitations of the electron
system as a bosonic single-particle. Indeed, the employment of bosonization
facilitates the inclusion of disorder in the study of the system. It has been
shown previously that disorder may drive a quantum phase transition in the Hall
ferromagnet. However, such studies have been either carried out in the
framework of nonlinear sigma model, as an effective low-energy theory, or
included the long-range Coulomb interaction in a quantum description only up to
the Hartree-Fock level. Here, we establish the occurrence of a disorder-driven
quantum phase transition from a ferromagnetic 2DEG to a spin glass phase by
taking into account interactions between electrons up to the random phase
approximation level in a fully quantum description.Comment: 18 pages, 7 figure
Chiral superconductivity from repulsive interactions in doped graphene
Author Manuscript 17 Sep 2011Chiral superconductivity, which breaks time-reversal symmetry, can exhibit a wealth of fascinating properties that are highly sought after for nanoscience applications. We identify doped graphene monolayer as a system where chiral superconductivity can be realized. In this material, a unique situation arises at a doping where the Fermi surface is nested and the density of states is singular. In this regime, d-wave superconductivity can emerge from repulsive electron–electron interactions. Using a renormalization group method, we argue that superconductivity dominates over all competing orders for generic weak repulsive interactions. Superconductivity develops simultaneously in two degenerate d-wave pairing channels. We argue that the resulting superconducting state is of chiral type, with the phase of the superconducting order parameter winding by 4π around the Fermi surface. Realization of this state in doped graphene will prove that superconductivity can emerge from electron–electron repulsion, and will open the door to applications of chiral superconductivity
Возможности лучевых методов в ранней пренатальной диагностике диастематомиелии (клинический случай)
The presented clinical case demonstrates capabilities of ultrasonography and MR imaging in diagnostics of combined developmental defect of spine (disorganization, wedge-shaped vertebra, scoliosis) and spinal cord (diastematomyelia) in fetus of 21th week of development confirmed by pathomorphological study.Представленный клинический случай демонстрирует возможности УЗИ и МРТ в диагностике сочетанного порока развития позвоночника (дезорганизация, клиновидные позвонки, сколиоз) и спинного мозга (диастематомиелия) у плода на 21-й нед развития, подтвержденные при патоморфологическом исследовании
“Fullerenes and Nanostructures in Condensed Matter”, X International Scientific Conference
The work is concerned with ascertainment of the regularities for thermostimulated formation of the phase composition and structure of CoSb3-scutterudite-based films deposited by the vacuum condensation method
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