排序方式： 共有33条查询结果，搜索用时 15 毫秒
11.
M. B. Barannik V. V. Kolobov V. N. Selivanov D. V. Kuklin A. A. Zhamaletdinov A. N. Shevtsov 《Seismic Instruments》2013,49(3):275-284
The structure and a possible practical application of the portable generator with extremely and super low frequency (ELF-SLF) range (0.1–200 Hz) and power of 2 kW are described. The generator is designed for deep sounding of the Earth’s crust for the purposes of mineral exploration and electromagnetic monitoring of source zones of earthquakes in seismically active regions. Computational and theoretical works, as well as numerical simulation for optimizing the generator’s parameters and element base, are carried out. The main constructive elements of the generator, namely, the power factor corrector, the driver control circuit for power transistors, the inverter of the high-frequency decoupling converter, the multichannel pulse power converter, the output inverter, and etc., are consistently described. The generator’s weight does not exceed 10 kg, and, therefore, the generator may be easily delivered to a testing site using any kind of transport, including planes. The generator is powered by the single-phase network with a voltage of 220 V. The full-scale testing of the generator is performed at the territory of the Yamalo-Nenets autonomous okrug via the connection to the high-voltage transmission line Urengoi-Pangody with a length of 114 km. The maximum current in the line is 12 A. The maximum distance of reliable signal recording is 110 km. 相似文献
12.
A diffusion approach was used to develop a statistical model of seismicity and to analyze Kamchatka earthquakes in order to
detect features in the changes that are typical of random walk processes. We proposed a hypothesis of relationships among
events and used an energy criterion to decompose the earth-quake catalog into a set of sequences, with each being a Brownian
process with definite spatial, temporal, and energy scales. We constructed statistical distributions for these sequences over
the number of their terms and total energies, as well as distributions of the sequences over distance, time, and flight times
between events. We discuss non-local properties and memory effects in the random walk under different conditions. 相似文献
13.
P. P. Firstov R. R. Akbashev R. Holzworth N. V. Cherneva B. M. Shevtsov 《Izvestiya Atmospheric and Oceanic Physics》2017,53(1):24-31
The development of a volcanic plume from the Shiveluch volcano explosion on November 16, 2014, is analyzed using a complex of geophysical methods. The start of the explosion was detected by seismic data. The World Wild Lightning Location Network (WWLLN) allowed the localization of volcanic lightning discharges that occurred during the first stage of the eruption plume. Satellite IR monitoring data made the plume structure obvious. An electrostatic fluxmeter mounted 113 km apart from the volcano recorded the first disturbances of the atmospheric electrical potential gradient (PG) at a distance of 90 km from the eruption cloud front. Two distinct PG anomalies, of 50 and 32 min in length and of more than 100 V/m in amplitude, recorded in 2 h, indicate two separate eruption formations formed by this time. The propagation velocities of two parts of the plume close to the wind speeds at altitudes of temperature inversions (9–10 and 12 km), according to balloon sensing, point out to the plume layering and propagation at two altitudes. 相似文献
14.
Zhamaletdinov A. A. Velikhov E. P. Shevtsov A. N. Skorokhodov A. A. Kolobov V. V. Ivonin V. V. Kolesnikov V. E. 《Doklady Earth Sciences》2019,486(1):575-579
Doklady Earth Sciences - This paper describes the Murman-2018 experiment on remote electromagnetic sounding in combination with frequency and audio magnetotelluric soundings. The experimental... 相似文献
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16.
A. V. Kuptsov Yu. V. Marapulets M. A. Mishchenko O. P. Rulenko B. M. Shevtsov A. O. Shcherbina 《Journal of Volcanology and Seismology》2007,1(5):349-353
A field instrument package was installed for synchronous measurements of acoustic emission in rocks at frequencies of 0.1–10000 Hz and the vertical gradient of electric potential in near-ground atmosphere. These investigations for the first time revealed a relationship between emission disturbances in the kilohertz frequency range due to deformation of near-surface rocks and the electric field. The relationship may be observed both during seismically quiet periods and at the final phase of earthquake precursory periods. 相似文献
17.
B. M. Shevtsov V. V. Bychkov V. N. Marichev A. S. Perezhogin A. V. Shumeiko 《Geomagnetism and Aeronomy》2009,49(8):1302-1304
The dynamics of aerosol layers in comparison with geomagnetic and ionospheric data has been studied based on the nighttime
single-frequency lidar sounding of the atmosphere over Kamchatka at altitudes of 10 to 90 km. The relation of the aerosol
density to solar, magnetic, and ionospheric activity has been studied, and the stratospheric aerosol formation mechanisms
have been considered. It has been indicated that variations in the aerosol density correlate with radiowave absorption, perturbations
of the ionospheric parameters, and geomagnetic characteristics. The spatial and time scales of aerosol layers have been estimated.
The role of stratospheric aerosol as an indicator of geophysical processes is discussed. 相似文献
18.
Permyakov M. S. Potalova E. Yu. Droga A. N. Shevtsov B. M. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(9):1194-1201
Izvestiya, Atmospheric and Oceanic Physics - We report the results of the use of the World Wide Lightning Location Network data to analyze the core structure of super typhoons that occurred in the... 相似文献
19.
The distribution of the three mass commercial cephalopod species (the Japanese common squid Todarodes pacificus, the neon flying squid Ommastrephes bartramii, and the boreal clubhook squid Onychoteuthis borealijaponica) on the Pacific side of the South Kuril Islands is analyzed in relation to oceanological conditions using the data of scientific catches of squids and oceanographic observations obtained by Japanese and Russians research vessels in August–September of 1994–1999. With respect to the extension of the waters of subtropical origin, three types of oceanological conditions are distinguished: the “conventionally cold” (1996, 1997), “conventionally warm” (1998, 1999) and “conventionally normal” (1994, 1995) conditions. It is shown that conventionally cold years are more favorable for the fishery of the Japanese common squid and the boreal clubhook squid and conventionally normal years are favorable for the fishery of all three squid species, while conventionally cold years are only favorable for the fishery of the neon flying squid. Particular features of the distribution and biology of each of the squid species considered are discussed. 相似文献
20.
On the basis of the diffusion approach, statistical analysis of seismicity is carried out in order to reveal the peculiarities characteristic of random walk processes. In accordance with the hypothesis on connectivity of earthquakes and energetic criterion, the expansion of the seismic process into a set of sequences is made; each sequence is a Brownian process with specific spatial, temporal, and energetic scales. The statistical distributions of sequences by the number of links, total energies, distances, time, and flight velocities between events are built. 相似文献