172 research outputs found
Prognostic criteria of heart rate variability at the daily monitoring
The data of comparative researches of parameters of heart rate variability on the basis of daily ECG registration with regard circadian oscillations of heart rate. Shown significant reduction in both temporary and spectral indices of daily variability of a heart rhythm in adolescents with scoliosis without significant imbalance parasympathetic and sympathetic departments of ANS. These changes indicate violations of interaction between different parts of ANS in providing functionality driving rhythm and demonstrated reduction of adaptational possibilities of the organism, which leads to a heightened risk of violations of the regulation of the heart rate in this group of adolescentsΠΡΠΈΠ²Π΅Π΄Π΅Π½Ρ Π΄Π°Π½Π½ΡΠ΅ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»Π΅ΠΉ Π²Π°ΡΠΈΠ°Π±Π΅Π»ΡΠ½ΠΎΡΡΠΈ ΡΠ΅ΡΠ΄Π΅ΡΠ½ΠΎΠ³ΠΎ ΡΠΈΡΠΌΠ° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΡΡΠΎΡΠ½ΠΎΠΉ ΡΠ΅Π³ΠΈΡΡΡΠ°ΡΠΈΠΈ ΠΠΠ Ρ ΡΡΠ΅ΡΠΎΠΌ ΡΠΈΡΠΊΠ°Π΄Π½ΡΡ
ΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΠΉ ΡΠΈΡΠΌΠ° ΡΠ΅ΡΠ΄ΡΠ°. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΠΎΠ΅ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ ΠΊΠ°ΠΊ Π²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
, ΡΠ°ΠΊ ΠΈ ΡΠΏΠ΅ΠΊΡΡΠ°Π»ΡΠ½ΡΡ
ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»Π΅ΠΉ ΡΡΡΠΎΡΠ½ΠΎΠΉ Π²Π°ΡΠΈΠ°Π±Π΅Π»ΡΠ½ΠΎΡΡΠΈ ΡΠ΅ΡΠ΄Π΅ΡΠ½ΠΎΠ³ΠΎ ΡΠΈΡΠΌΠ° Ρ ΠΏΠΎΠ΄ΡΠΎΡΡΠΊΠΎΠ² ΡΠΎ ΡΠΊΠΎΠ»ΠΈΠΎΠ·ΠΎΠΌ Π±Π΅Π· Π²ΡΡΠ°ΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ Π΄ΠΈΡΠ±Π°Π»Π°Π½ΡΠ° ΠΏΠ°ΡΠ°ΡΠΈΠΌΠΏΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈ ΡΠΈΠΌΠΏΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΎΡΠ΄Π΅Π»ΠΎΠ² ΠΠΠ‘. ΠΠ°Π½Π½ΡΠ΅ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΠΊΠ°Π·ΡΠ²Π°ΡΡ Π½Π° Π½Π°ΡΡΡΠ΅Π½ΠΈΡ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΌΠ΅ΠΆΠ΄Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠΌΠΈ Π·Π²Π΅Π½ΡΡΠΌΠΈ ΠΠΠ‘ Π² ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΠΈ ΡΡΠ½ΠΊΡΠΈΠΈ Π²ΠΎΠΆΠ΄Π΅Π½ΠΈΡ ΡΠΈΡΠΌΠ° ΠΈ ΡΠ²ΠΈΠ΄Π΅ΡΠ΅Π»ΡΡΡΠ²ΡΡΡ ΠΎ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠΈ Π°Π΄Π°ΠΏΡΠ°ΡΠΈΠΎΠ½Π½ΡΡ
Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠ΅ΠΉ ΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠ°, ΡΡΠΎ Π²Π΅Π΄Π΅Ρ ΠΊ ΠΏΠΎΠ²ΡΡΠ΅Π½Π½ΠΎΠΌΡ ΡΠΈΡΠΊΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ Π½Π°ΡΡΡΠ΅Π½ΠΈΠΉ ΡΠ΅Π³ΡΠ»ΡΡΠΈΠΈ ΡΠ΅ΡΠ΄Π΅ΡΠ½ΠΎΠ³ΠΎ ΡΠΈΡΠΌΠ° Π² Π΄Π°Π½Π½ΠΎΠΉ Π³ΡΡΠΏΠΏΠ΅ ΠΏΠΎΠ΄ΡΠΎΡΡΠΊΠΎ
Stationary waves in a superfluid exciton gas in quantum Hall bilayers
Stationary waves in a superfluid magnetoexciton gas in nu = 1 quantum Hall
bilayers are considered. The waves are induced by counter-propagating
electrical currents that flow in a system with a point obstacle. It is shown
that stationary waves can emerge only in imbalanced bilayers in a certain
diapason of currents. It is found that the stationary wave pattern is modified
qualitatively under a variation of the ratio of the interlayer distance to the
magnetic length d/l. The advantages of use graphene-dielectric-graphene
sandwiches for the observation of stationary waves are discussed. We determine
the range of parameters (the dielectric constant of the layer that separates
two graphene layers and the ratio d/l) for which the state with superfluid
magnetoexcitons can be realized in such sandwiches. Typical stationary wave
patterns are presented as density plotsComment: 17 pages, 8 figure
Crystal Undulator As A Novel Compact Source Of Radiation
A crystalline undulator (CU) with periodically deformed crystallographic
planes is capable of deflecting charged particles with the same strength as an
equivalent magnetic field of 1000 T and could provide quite a short period L in
the sub-millimeter range. We present an idea for creation of a CU and report
its first realization. One face of a silicon crystal was given periodic
micro-scratches (grooves), with a period of 1 mm, by means of a diamond blade.
The X-ray tests of the crystal deformation have shown that a sinusoidal-like
shape of crystalline planes goes through the bulk of the crystal. This opens up
the possibility for experiments with high-energy particles channeled in CU, a
novel compact source of radiation. The first experiment on photon emission in
CU has been started at LNF with 800 MeV positrons aiming to produce 50 keV
undulator photons.Comment: Presented at PAC 2003 (Portland, May 12-16
Nuclear Track Emulsion in Search for the Hoyleβs State in Dissociation of Relativistic 12C Nuclei
Study of production of ensembles of alpha-particle triples associated with the Hoyle state (the second excited state 0+ 2 of the 12 C nucleus) in peripheral dissociation of relativistic 12C nuclei is started. Stacks of pellicles of nuclear track emulsion exposed to 12C of energy from hundreds MeV to few GeV per nucleon serve as the material of the study. The Hoyle state decays are reconstructed via measurements of emission angles of Ξ±-particles with accuracy that allows one to identify the unstable 8Be nucleus. A role in the Hoyle state of alpha-particle bonds corresponding to 8Be is determined
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