109 research outputs found
Meteoric phenomena in the earth's atmosphere. Investigations of meteors, no. 2
Meteoritic radiance and ionization observations in earth atmospher
Lidar investigations of M-zone
The creation of pulse dye lasers tuned to resonant line of meteor produced admixtures of atmospheric constituents has made it possible to begin lidar investigations of the vertical distribution of mesospheric sodium concentration and its dynamics in the upper atmosphere. The observed morning increase of sodium concentration in the vertical column is probably caused by diurnal variations of sporadic meteors. The study of the dynamics of the sodium column concentration in the period of meteor streams activity confirms the suggestion of cosmic origin of these atoms. The short lived increase of sodium concentration brought about by a meteor stream, however, exceeds by one order the level of the sporadic background
Characteristics of air showers created by extremely high energy gamma-rays
The technique of adjoint cascade equations has been applied to calculate the
properties of extremely high energy gamma-rays in the energy range 10^18--10^22
eV with taking into account the LPM effect and interactions of gamma-rays with
the geomagnetic field. Such characteristics are analysed as the electron and
muon contents at the observation level, the electron cascade curves, the
lateral distribution functions of photoproduced muons.Comment: 36 pages, 19 figures, submitted to J.Phys.G: Nucl.Part.Phy
Design and construction of new central and forward muon counters for CDF II
New scintillation counters have been designed and constructed for the CDF
upgrade in order to complete the muon coverage of the central CDF detector, and
to extend this coverage to larger pseudorapidity. A novel light collection
technique using wavelength shifting fibers, together with high quality
polystyrene-based scintillator resulted in compact counters with good and
stable light collection efficiency over lengths extending up to 320 cm. Their
design and construction is described and results of their initial performance
are reported.Comment: 20 pages, 15 figure
A study on the sharp knee and fine structures of cosmic ray spectra
The paper investigates the overall and detailed features of cosmic ray (CR)
spectra in the knee region using the scenario of nuclei-photon interactions
around the acceleration sources. Young supernova remnants can be the physical
realities of such kind of CR acceleration sites. The results show that the
model can well explain the following problems simultaneously with one set of
source parameters: the knee of CR spectra and the sharpness of the knee, the
detailed irregular structures of CR spectra, the so-called "component B" of
Galactic CRs, and the electron/positron excesses reported by recent
observations. The coherent explanation serves as evidence that at least a
portion of CRs might be accelerated at the sources similar to young supernova
remnants, and one set of source parameters indicates that this portion mainly
comes from standard sources or from a single source.Comment: 13 pages, 4 figures, accepted for publication in SCIENCE CHINA
Physics, Mechanics & Astronomy
Testing of the VENUS 4.12, DPMJET 2.55, QGSJET II-03 and SIBYLL 2.3 hadronic interaction models via help of the atmospheric vertical muon spectra
Uncertainties of the model energy spectra of the most energetic secondary ΟΒ± -mesons (and KΒ± -mesons) are discussed. Computer simulations of the partial energy spectra of the atmospheric vertical muons induced by primary cosmic particles with various fixed energies in interval 102 β107 GeV in terms of the VENUS 4.12, DPMJET 2.55, QGSJET II-03 and SIBYLL 2.3 models had been carried out with help of CORSIKA package. These partial spectra should be convoluted with the contemporary spectra of the primary cosmic particles. Results of simulations are compared with the contemporary atmospheric vertical muon flux data. Comparison shows that all models underestimate production of secondary ΟΒ± -mesons (and KΒ± -mesons) by factor of βΌ 2 at the most high energies. This underestimation induces more rapid development of extensive air showers in the atmosphere and results in uncertainties in estimates of energy and composition of the primary cosmic particles
Measuring extensive air showers with Cherenkov light detectors of the Yakutsk array: The energy spectrum of cosmic rays
The energy spectrum of cosmic rays in the range 10^15 eV to 6*10^19 eV has
been studied using the air Cherenkov light detectors of the Yakutsk array. The
total flux of photons produced by relativistic electrons (including positrons
as well, hereafter) of extensive air showers in the atmosphere is used as the
energy estimator of the primary particle initiating a shower. The resultant
differential flux of cosmic rays exhibits, in accordance with previous
measurements, a knee and ankle features at energies 3*10^15 and ~10^19 eV,
respectively. A comparison of observational data with simulations is made in
the knee and ankle regions in order to choose the models of galactic and
extragalactic components of cosmic rays which describe better the energy
spectrum measured.Comment: 27 pages, 22 figures, accepted for publication in New Journal of
Physics (Focus Issue
Tunka Advanced Instrument for cosmic rays and Gamma Astronomy
The paper is a script of a lecture given at the ISAPP-Baikal summer school in
2018. The lecture gives an overview of the Tunka Advanced Instrument for cosmic
rays and Gamma Astronomy (TAIGA) facility including historical introduction,
description of existing and future setups, and outreach and open data
activities.Comment: Lectures given at the ISAPP-Baikal Summer School 2018: Exploring the
Universe through multiple messengers, 12-21 July 2018, Bol'shie Koty, Russi
Π‘ΡΠ²ΠΎΠ»ΠΎΠ²ΠΎΠΉ ΡΠ½ΡΠ΅ΡΠ°Π»ΠΈΡ ΠΠΈΠΊΠ΅ΡΡΡΠ°ΡΡΠ°, ΠΎΡΡΡΡΠΉ ΠΏΠΎΠΏΠ΅ΡΠ΅ΡΠ½ΡΠΉ ΠΌΠΈΠ΅Π»ΠΈΡ ΠΈ ΠΎΡΡΡΠ°Ρ ΠΌΠΎΡΠΎΡΠ½Π°Ρ Π°ΠΊΡΠΎΠ½Π°Π»ΡΠ½Π°Ρ Π½Π΅ΠΉΡΠΎΠΏΠ°ΡΠΈΡ: ΡΠ»ΠΎΠΆΠ½ΠΎΡΡΠΈ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ ΠΈ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΠΏΠ΅ΡΠ΅ΠΊΡΠ΅ΡΡΠ½ΡΠΌΠΈ ΡΠΈΠ½Π΄ΡΠΎΠΌΠ°ΠΌΠΈ. ΠΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠ΅
We report a 40-year-old woman presented with consciousness disturbance, ataxia, asymmetrical limb weakness, hyperreflexia. Due to magnetic resonance imaging findings, the patient was diagnosed with Bickerstaffβs brainstem encephalitis overlapped with acute transverse myelitis. Later she developed distal muscles atrophy and the electroneuromyographic study revealed axonal motor neuropathy, therefore acute motor axonal neuropathy was diagnosed. The patient underwent one course of intravenous immunoglobulin therapy with the regression of symptoms and magnetic resonance imaging changes. Nine months after symptoms onset, the patient has completely recovered. This overlapping case of Bickerstaffβs brainstem encephalitis, acute transverse myelitis and acute motor axonal neuropathy provides further support that these conditions are part of the same spectrum.Β ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ΠΎ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠ΅ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΊΠΈ 40 Π»Π΅Ρ Ρ Π½Π°ΡΡΡΠ΅Π½ΠΈΠ΅ΠΌ ΡΠΎΠ·Π½Π°Π½ΠΈΡ, Π°ΡΠ°ΠΊΡΠΈΠ΅ΠΉ, Π°ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΡΠ½ΡΠΌ Π½ΠΈΠΆΠ½ΠΈΠΌ ΠΏΠ°ΡΠ°ΠΏΠ°- ΡΠ΅Π·ΠΎΠΌ, Π³ΠΈΠΏΠ΅ΡΡΠ΅ΡΠ»Π΅ΠΊΡΠΈΠ΅ΠΉ. Π ΡΠ²ΡΠ·ΠΈ Ρ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΠΏΠΎ Π΄Π°Π½Π½ΡΠΌ ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎ-ΡΠ΅Π·ΠΎΠ½Π°Π½ΡΠ½ΠΎΠΉ ΡΠΎΠΌΠΎΠ³ΡΠ°ΡΠΈΠΈ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ Π³ΠΎΠ»ΠΎΠ²Π½ΠΎΠ³ΠΎ ΠΈ ΡΠΏΠΈΠ½Π½ΠΎΠ³ΠΎ ΠΌΠΎΠ·Π³Π° Π±ΡΠ» ΠΏΠΎΡΡΠ°Π²Π»Π΅Π½ Π΄ΠΈΠ°Π³Π½ΠΎΠ· ΡΡΠ²ΠΎΠ»ΠΎΠ²ΠΎΠ³ΠΎ ΡΠ½ΡΠ΅ΡΠ°Π»ΠΈΡΠ° ΠΠΈΠΊΠ΅ΡΡΡΠ°ΡΡΠ° ΠΈ ΠΎΡΡΡΠΎΠ³ΠΎ ΠΏΠΎΠΏΠ΅ΡΠ΅ΡΠ½ΠΎΠ³ΠΎ ΠΌΠΈΠ΅Π»ΠΈΡΠ°. ΠΠΎΠ·Π΄Π½Π΅Π΅ Π²Π²ΠΈΠ΄Ρ ΡΠ°Π·Π²ΠΈΠ²ΡΠ΅ΠΉΡΡ Π°ΡΡΠΎΡΠΈΠΈ Π΄ΠΈΡΡΠ°Π»ΡΠ½ΡΡ
ΠΌΡΡΡ Π²Π΅ΡΡ
Π½ΠΈΡ
ΠΈ Π½ΠΈΠΆΠ½ΠΈΡ
ΠΊΠΎΠ½Π΅ΡΠ½ΠΎΡΡΠ΅ΠΉ Π±ΡΠ»ΠΎ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π΅ΠΉΡΠΎΠΌΠΈΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅, Π²ΡΡΠ²ΠΈΠ²ΡΠ΅Π΅ ΠΈΠ·ΠΎΠ»ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ΅ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ ΠΌΠΎΡΠΎΡΠ½ΡΡ
Π²ΠΎΠ»ΠΎΠΊΠΎΠ½ ΠΈ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠ΄ΠΈΠ²ΡΠ΅Π΅ ΠΏΡΠΈΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠ΅ ΠΎΡΡΡΠΎΠΉ ΠΌΠΎΡΠΎΡΠ½ΠΎΠΉ Π°ΠΊΡΠΎΠ½Π°Π»ΡΠ½ΠΎΠΉ Π½Π΅ΠΉΡΠΎΠΏΠ°ΡΠΈΠΈ. ΠΠ΄Π½ΠΎΠΊΡΠ°ΡΠ½ΡΠΉ ΠΊΡΡΡ Π²Π½ΡΡΡΠΈΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΠΈΠΌΠΌΡΠ½ΠΎΠ³Π»ΠΎΠ±ΡΠ»ΠΈΠ½Π° Π΄Π°Π» ΠΏΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΡΠΉ ΡΡΡΠ΅ΠΊΡ c ΡΠ΅Π³ΡΠ΅ΡΡΠΎΠΌ ΡΠΈΠΌΠΏΡΠΎΠΌΠΎΠ² ΠΈ ΠΎΡΠ°Π³ΠΎΠ²ΡΡ
ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ ΠΏΡΠΈ ΠΏΠΎΠ²ΡΠΎΡΠ½ΠΎΠΌ ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎ-ΡΠ΅Π·ΠΎΠ½Π°Π½ΡΠ½ΠΎΠΌ ΠΈΡcΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ. Π§Π΅ΡΠ΅Π· 9 ΠΌΠ΅Ρ ΠΎΡ Π΄Π΅Π±ΡΡΠ° Π±ΠΎΠ»Π΅Π·Π½ΠΈ ΠΎΡΠΌΠ΅ΡΠ΅Π½ΠΎ ΠΏΠΎΠ»Π½ΠΎΠ΅ Π²ΠΎΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΠ΅ Π½Π΅Π²ΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π΄Π΅ΡΠΈΡΠΈΡΠ°. Π’Π°ΠΊΠΈΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ, Π±ΡΠ» ΠΏΠΎΡΡΠ°Π²Π»Π΅Π½ Π΄ΠΈΠ°Π³Π½ΠΎΠ· ΠΏΠ΅ΡΠ΅ΠΊΡΠ΅ΡΡΠ½ΠΎΠ³ΠΎ ΡΠΈΠ½Π΄ΡΠΎΠΌΠ° ΡΡΠ²ΠΎΠ»ΠΎΠ²ΠΎΠ³ΠΎ ΡΠ½ΡΠ΅ΡΠ°Π»ΠΈΡΠ° ΠΠΈΠΊΠ΅ΡΡΡΠ°ΡΡΠ°, ΠΎΡΡΡΠΎΠ³ΠΎ ΠΏΠΎΠΏΠ΅ΡΠ΅ΡΠ½ΠΎΠ³ΠΎ ΠΌΠΈΠ΅Π»ΠΈΡΠ° ΠΈ ΠΎΡΡΡΠΎΠΉ ΠΌΠΎΡΠΎΡΠ½ΠΎΠΉ Π°ΠΊΡΠΎΠ½Π°Π»ΡΠ½ΠΎΠΉ Π½Π΅ΠΉΡΠΎΠΏΠ°ΡΠΈΠΈ. ΠΠΏΠΈΡΠ°Π½Π½ΡΠΉ ΡΠ»ΡΡΠ°ΠΉ ΠΌΠΎΠΆΠ΅Ρ ΡΠ»ΡΠΆΠΈΡΡ Π΄ΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΌ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π΅Π½ΠΈΠ΅ΠΌ ΠΏΠ°ΡΠΎΠ³Π΅Π½Π΅ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΡ
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