Tunka-Rex is an antenna array for the detection of radio emissions from extensive air showers generated by ultra–high energy cosmic rays. This emission has a broadband spectrum, which corresponds to ...pulses with durations of tens of nanoseconds and is measured in the band of 30 to 80 MHz. Matched filtering and artificial neural networks are used to improve signal processing at the Tunka-Rex facility. Matched filtering allows more accurate determination the signal peak time, but the best performance can only be achieved with white noise. Convolutional neural networks with autoencoder architecture are used to improve recognition of noise features in traces. These are implemented in Tunka-Rex signal processing and their performance is compared to that of standard means.
Tunka-Rex is an antenna array located in the Tunka Valley that measures the radio emissions of cosmic ray air showers with energies of up to 100 PeV. In this work, a precise technique for ...reconstructing a shower maximum from Tunka-Rex data is presented. A model is developed for calculating detector efficiency that considers different parameters: primary particle energy and mass ranges, shower geometry, and detector configuration. The systematic error introduced by the atmosphere in reconstructing a shower’s maximum depth is estimated, and the distribution of the mean shower maximum versus energy is determined.
The new Tunka-133 EAS Cherenkov array: Status of 2009 Antokhonov, B.V.; Beregnev, S.F.; Budnev, N.M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2011, Letnik:
628, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The deployment of the new Extensive air shower Cherenkov installation Tunka-133 with about 1
km
2 geometric acceptance area was completed in October 2009. The array will permit a detailed long-term ...study of the cosmic ray energy spectrum and mass composition in the energy range 10
15–10
18
eV with a unique and more elaborate method. The array construction and data acquisition system, preliminary results and plans for future development are presented.
The Tunka-HISCORE wide-angle Cherenkov array, one part of the planned TAIGA integrated gamma observatory intended for investigations in the field of high-energy (>30 TeV) gamma-ray astronomy and ...cosmic-ray physics, is deployed in the Tunka Valley (Buryat Republic). The first results from operating a prototype array composed of nine stations spread over an area of ∼0.1 square kilometers during the winter of 2013–2014 are presented. Data processing techniques are described, along with data on the accuracy of reconstructing the position of a shower’s axis, energy, and angle of arrival. The differential spectrum of all cosmic-ray particles in a shower in the energy range of 2 × 10
14
to 2 × 10
16
eV is presented and compared to the available data.
Acetaminophen (AAP) is one of the most common and widely used antipyretic drugs, but its overdose is the leading cause of fulminant hepatic insufficiency in the world. Mechanisms of liver damage at ...the use of toxic doses of AAP are caused by the transformation of the isoform of cytochrome P450 (CYP2E1, CYP2A6) into a reactive metabolite, N-acetyl-parabenzoquinonimine (NAPQI), which plays a major role in hepatotoxicity. Another mechanism of hepatotoxicity includes the formation of peroxynitrite – a toxic free radical produced in the mitochondria, which causes oxidative damage. In addition to liver damage in case of acetaminophen poisoning, nephrotoxic effect can occur. Potential mechanisms of nephrotoxicity in overdose of AAP are presented, caused by cytochrome P450, as well as prostaglandin synthetase and enzyme N-deacetylase are described. In the clinical case described by us, the development of fulminant hepatic insufficiency against the background of acetaminophen administration led to the development of a coma along with the kidney damage, however, a stable positive dynamics, was achieved during treatment. In the catamnesis 2.5 years later, there were no signs of fibrosis or cirrhosis of the liver.
The Tunka-Grande experiment: Status and prospects Monkhoev, R. D.; Budnev, N. M.; Voronin, D. M. ...
Bulletin of the Russian Academy of Sciences. Physics,
04/2017, Letnik:
81, Številka:
4
Journal Article
Recenzirano
The Tunka-Grande scintillation array is described. The first results from its operation are presented. The prospects for studying primary cosmic rays in the energy range of 10
16
to 10
18
eV during ...simultaneous registration of the Cherenkov and charged particle components along with radio emissions from extensive air showers are discussed.
The article presents the relevance and advantages of the new gamma observatory TAIGA (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy), which is being constructed in the Tunka ...Valley 50 km from Lake Baikal. Various detectors of the six TAIGA gamma observatory arrays register the Cherenkov and radio radiation, as well as the electron and muon components of EAS. The primary objective of the TAIGA gamma observatory is to study the high-energy part of the gamma-ray spectrum, in particular, in order to search for Galactic PeVatrons. The energy, direction, and position of the EAS axis are reconstructed in the observatory based on the data of the wide-angle Cherenkov detectors of the TAIGA-HiSCORE experiment. Taking into account this information, the gamma quanta are distinguished from the hadron background using the data obtained by the muon detectors and telescopes that register the EAS image in the Cherenkov light. In this hybrid mode of operation, the atmospheric Cherenkov telescopes can operate in the mono-mode, and the distance between them can be increased to 800–1000 m, which makes it possible to construct an array with an area of 5 km
2
and more at relatively low cost and in a short time. By 2019, the first stage of the gamma observatory with an area of 1 km
2
will be constructed; its expected integral sensitivity for detecting the gamma radiation with an energy of 100 TeV at observation of the source for 300 hours will be approximately
10
–13
TeV cm
–2
s
–1
.
The processes of horizontal and vertical water exchange play the most important role in the ecosys tem of Lake Baikal providing the transport of organic and inorganic matter including oxygen in the ...entire volume of water up to the limiting depths. The investigation of the main processes of water transport in Lake Baikal based on the traditional methods of episodic profiling from research ships does not supply sufficient information about many inhomogeneous and nonsta tionary processes. The difficulties are also related to the insufficient sensitivity of the existing instruments for measuring the vertical motion of water whose velocity usually does not exceed a few fractions of a millimeter per second.
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