Features of wind waves at the southeastern coast of Sakhalin according to bottom-pressure measurements     

K. I. Kuznetsov  A. A. Kurkin  E. N. Pelinovsky  P. D. Kovalev 《Izvestiya Atmospheric and Oceanic Physics》2014,50(2):213-220

The results of wind-wave measurements with bottom-pressure sensors are discussed. These measurements were performed at the southeastern coast of the Island of Sakhalin in 2006–2009. The problems of converting data obtained with these sensors into water-level displacent in the context of the linear theory are noted. Twenty records with a duration of 2 weeks to 3 months were obtained. These records contain from 150000 to 1200000 waves for three different observation points located at the southeastern coast of Sakhalin in the regions of the village of Vzmor’ye, Lake Izmenchivoye, and the Cape of Ostryi. The estimates obtained for wave-height distributions were approximated by the Weibull distribution. They were compared to the theoretical Rayleigh, Forristall, Weibull, and Glukhovskii distributions. As one would expect, in the region of small wave heights, all distributions prove to be close to one another, and, for large wave heights, the Weibull distribution is preferred.  相似文献   

First data on the chemical composition and morphology of gold in the Tuba Kain deposit (South Urals)     

S. G. Kovalev  V. N. Puchkov  S. I. Vysotskii  V. A. Kotlyarov 《Doklady Earth Sciences》2014,457(2):926-930

  相似文献   

On the acceleration of solar-flare charged particles in a collapsing magnetic trap with an electric potential     

V. A. Kovalev  B. V. Somov 《Astronomy Letters》2002,28(7):488-493

We consider the kinetic problem of charged-particle acceleration in a magnetic trap with converging magnetic mirrors. We show that for a positive electrostatic potential of the trap plasma relative to the mirrors, the efficiency of confinement and acceleration increases for electrons and decreases for ions.  相似文献   

Late Precambrian rifting in the geological history of the western slope of the South Urals     

S. G. Kovalev 《Geotectonics》2008,42(2):137-146

The rift-related geodynamic setting of the Late Precambrian geological evolution on the western slope of the South Urals is reconstructed on the basis of localization of lithotectonic complexes of this age, their formation conditions, and the geochemistry of rocks. The Early Riphean stage comprises accumulation of coarse-clastic rocks intercalating with alkaline volcanic rocks of the Navysh Complex, which is a constituent of the Ai Formation, and emplacement of doleritic and picritic intrusions of the Shuida Complex and melanocratic dolerite and gabbrodolerite of the Yusha Complex. The Middle Riphean stage is characterized by wide-spread coarse-clastic terrigenous rocks of the Mashak Formation that intercalate with volcanic rocks of the bimodal basalt-rhyolite association, the Berdyaush pluton of rapakivi granite, the Kusa-Kopan layered intrusive complex, the Lapyshta Complex of dolerites and picrites, and numerous occurrences of gabbrodolerites. The terrigenous rocks of the Vendian stage include conglomerate, gravelstone, and sandstone of the Asha Group, while igneous rocks comprise alkaline volcanics of the Arsha Complex, alkali gabbroids of the Miseli Complex, and melanocratic syenite of the Avashla Complex. The geological evolution of the region is distinguished by local (failed or aborted) rifting. The occurrence of lithotectonic complexes is controlled by dynamic conditions of rifting. A certain inheritance in the evolution may be traced for the Early and Middle Riphean and partly for the Late Riphean and Vendian.  相似文献   

New data on geology of the Shatak Complex (western slope of the Southern Urals)     

S. G. Kovalev  I. V. Vysotskii 《Lithology and Mineral Resources》2008,43(3):250-259

The comprehensive study of sections of the Shatak Complex has revealed that conglomerates at the base of Middle Riphean rocks are not basal but intraformational rocks. Previously described angular unconformities between shales of the Sukhin Subformation (Yusha Formation, R₁) and conglomerates of the Kuz”elga Subformation (Mashak Formation, R₂) are related to late tectonic movements. Magmatic rocks developed at the base of the Middle Riphean section are represented by sheet intrusions formed in the course of emplacement of a fluid-saturated magmatic melt into partially or completely lithified terrigenous rocks at the graben formation stage during the origination of synkinematic faults that served as magma conduits. It is inferred that distribution of provenances of clastic materials and sedimentation basins in the Burzyanian and Yurmatian should be scrutinized in the study region, because the normal regressive sequence of rocks from the uppermost Yusha Formation to the lowermost Mashak Formation, which was established in the Shatak Ridge, eliminates a clear boundary distinguished between them at present. The idea about an older age of the Mashak conglomerates is substantiated.  相似文献   

Disseminated gold–sulfide mineralization at the Zhaima deposit,eastern Kazakhstan     

K. R. Kovalev  O. N. Kuzmina  B. A. Dyachkov  A. G. Vladimirov  Yu. A. Kalinin  E. A. Naumov  M. V. Kirillov  I. Yu. Annikova 《Geology of Ore Deposits》2016,58(2):116-133

The Zhaima gold–sulfide deposit is located in the northwestern part of the West Kalba gold belt in eastern Kazakhstan. The mineralization is hosted in Lower Carboniferous volcanic and carbonate rocks formed under conditions of marginal-sea and island-arc volcanic activity. The paper considers the mineralogy and geochemistry of primary gold–sulfide ore and Au-bearing weathering crusts. Au-bearing arsenopyrite–pyrite mineralization formed during only one productive stage. Disseminated, stringer–disseminated, and massive rocks are enriched in Ti, Cr, V, Cu, and Ni, which correspond to the mafic profile of basement. The main ores minerals are represented by finely acicular arsenopyrite containing Au (up to few tens of ppm) and cubic and pentagonal dodecahedral pyrite with sporadic submicroscopic inclusions of native gold. The sulfur isotopic composition of sulfides is close to that of the meteoritic standard (δ³⁴S =–0.2 to +0.2). The ⁴⁰Ar/³⁹Ar age of three sericite samples from ore veinlets corresponds to the Early Permian: 279 ± 3.3, 275.6 ± 2.9, and 272.2 ± 2.9 Ma. The mantle source of sulfur, ore geochemistry, and spatial compatibility of mineralization with basic dikes allow us to speak about the existence of deep fluid–magmatic systems apparently conjugate with the Tarim plume.  相似文献   

Crab pulsar: Magnetized cracks in the crust as a key to mechanisms of the matter flow,radio and high-frequency emissions     

Yu. A. Kovalev 《Astrophysics and Space Science》1980,67(2):387-395

It is possible that magnetized cracks may exist for long periods in the crust and that matter from the mantle may flow through them continuously into the magnetosphere. On this basis a consistent model of the Crab pulsar is constructed in which radio emission is generated in the star mantle by the Josephson effect, whereas X-ray and optical emissions are generated in the cracks and in the magnetosphere over the cracks during the flow of electrons and protons from the mantle.  相似文献   

Application of laser strainmenters to the study of earthquake physics     

Grigory I. Dolgikh  Mstislav N. Dubrov  Stanislav G. Dolgikh  Sergei N. Kovalev  Vladimir V. Ovcharenko  Egor A. Savvin  Vladimir A. Chupin  Vyacheslav A. Shvets  Sergei V. Yakovenko 《Acta Geophysica》2006,54(2):187-197

The paper considers possibilities of applying laser strainmeters for the study of earthquake physics. One of laser strainmeters is described. A high efficiency of using the laser strainmeters for the study of earthquakes and their precursors is shown. In records of the spaced laser strainmeters, anomalous deformations propagating from the east to the west with the speed comparable with that of migration of earthquakes were found.  相似文献   

Quasi-simultaneous VLBI and RATAN-600 observations of active galactic nuclei     

A. B. Pushkarev  Yu. Yu. Kovalev  I. E. Molotov  M. B. Nechaeva  Yu. N. Gorshenkov  G. Tuccari  C. Stanghellini  X. Hong  J. Quick  S. Dougherty  X. Liu 《Astronomy Reports》2004,48(11):900-908

VLBI observations of several quasars and BL Lacertae objects were carried out at 1.66 GHz in November–December 1999 using six antennas (Medvezh'i Ozera, Svetloe, Pushchino, Noto, HartRAO, and Shanghai). Maps of six sources (0420+022, 0420-014, 1308+326, 1345+125, 1803+784, and DA 193) obtained with milliarcsecond resolution are presented and discussed, together with their broad-band (1–22 GHz) spectra obtained on the RATAN-600 radio telescope at epochs close to those of the VLBI observations. Comparison of the VLBI maps with maps of these sources obtained on standard VLBI networks and with the RATAN-600 quasisimultaneous total-flux measurements indicates the reliability of the results obtained on this Low Frequency VLBI Network and the good efficiency of this network.  相似文献   

Energy Spectra of Cosmic-Ray Protons and Nuclei Measured in the NUCLEON Experiment Using a New Method     

Atkin  E. V.  Bulatov  V.L.  Vasiliev  O. A.  Voronin  A. G.  Gorbunov  N. V.  Grebenyuk  V. M.  Dorokhov  V. A.  Karmanov  D. E.  Kovalev  I.M.  Kudryashov  I. A.  Kurganov  A.A.  Merkin  M. M.  Panov  A.D.  Podorozhny  D. M.  Polkov  D. A.  Porokhovoi  S. Yu.  Sveshnikova  L. G.  Tkachev  L.G.  Tkachenko  A. V.  Turundaevskiy  A. N.  Filippov  S. B.  Shumikhin  V. V. 《Astronomy Reports》2019,63(1):66-78

Astronomy Reports - Some results of studies of cosmic rays obtained during the NUCLEON space experiment in 2015–2017 are presented. This experiment was intended for direct measurements of the...  相似文献