930 research outputs found
Estimating the contribution from different ionospheric regions to the TEC response to the solar flares using data from the international GPS network
This paper proposes a new method for estimating the contribution from
different ionospheric regions to the response of total electron content
variations to the solar flare which uses the effect of partial shadowing of the
atmosphere by the terrestrial globe. The study uses GPS stations located near
the boundary of the shadow on the ground in the nightside hemisphere. The beams
between the satellite-borne transmitter and the receiver on the ground for
these stations pass partially through the atmosphere lying in the region of
total shadow and partially through the illuminated atmosphere. The analysis of
the ionospheric effect of a powerful solar flare of class X5.7/3B that was
recorded on July 14,
2000 (10:24 UT, N22W07) in quiet geomagnetic conditions (Dst=-10 nT) has
shown that about 20% of the TEC increase correspond to the ionospheric region
lying below 100 km, about 5% refer to the ionospheric E-region (100-140 km),
about 30% correspond to the F1-region (140-200 km), and about 30% to regions
lying above 300 km.Comment: LaTeX, 6 pages, 4 figures, 1 tabl
Conductivity, weak ferromagnetism and charge instability in single crystal
The temperature dependence of resistivity, magnetization and electron-spin
resonance of the single crystal were measured in temperature
range of . Magnetization hysteresis in applied magnetic field
up to 0.7 T at , irreversible temperature behavior of
magnetization and resistivity were found . The obtained data were explained in
terms of degenerate tight binding model using random phase approximation. The
contribution of holes in and bands of manganese ions to the
conductivity, optical absorbtion spectra and charge instability in were studied. Charge susceptibility maxima resulted from the competition of
the on-site Coulomb interaction between the holes in different orbitals and
small hybridization of sub-bands were calculated at .Comment: 6 pages, 12 figure
Electron Bloch Oscillations and Electromagnetic Transparency of Semiconductor Superlattices in Multi-Frequency Electric Fields
We examine phenomenon of electromagnetic transparency in semiconductor
superlattices (having various miniband dispersion laws) in the presence of
multi-frequency periodic and non-periodic electric fields. Effects of induced
transparency and spontaneous generation of static fields are discussed. We paid
a special attention on a self-induced electromagnetic transparency and its
correlation to dynamic electron localization. Processes and mechanisms of the
transparency formation, collapse, and stabilization in the presence of external
fields are studied. In particular, we present the numerical results of the time
evolution of the superlattice current in an external biharmonic field showing
main channels of transparency collapse and its partial stabilization in the
case of low electron density superlattices
Relativistic dynamical polarizability of hydrogen-like atoms
Using the operator representation of the Dirac Coulomb Green function the analytical method in perturbation theory is employed in obtaining solutions of the Dirac equation for a hydrogen-like atom in a time-dependent electric field. The relativistic dynamical polarizability of hydrogen-like atoms is calculated and analysed
The analysis of magnetic field measurements of T Tau
It is shown that the existence of hot accretion spots at the surface of T Tau
practically has no effect on the accuracy of estimation of its magnetic field
strength at photospheric level.
We also found that one can interpret results of T Tau's photospheric magnetic
field strength measurements carried out via different methods in the frame of
the following alternative: 1) if T Tau's inclination angle
then magnetic field of the star may be dipolar with the angle between
rotational and magnetic axes is near 2) if it will be found (e.g.
from interferometric observations) that then magnetic field of T
Tau is essentially non-dipolar or/and non-stationary.Comment: 4 figure
Development of health care financial provision system : experience in the Russian Federation and in other countries
Health care is a branch of governmental activity, with the main aim to organize and provide accessible medical service and public health care.
A study of economic literature on reforms of health care financial provision in the Russian Federation includes academic papers, analytical reviews, results of health care financial provision experience in the Russian Federation and in other countries.
A conclusion about the inconsistent approaches to institutional foundations of health care facilities, financial provision, peculiarities of formation of sources, composition and mechanism of health care facilities, and justification of ways for further development of health care financial provision in presented.
The diversity of emerging issues concerning Russian health care financial provision, debatableness of their practical solutions, necessity of systematization of successful experiences in many countries requires a more detailed analysis and understanding, which defines the relevance of the topic of the given study.peer-reviewe
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