New sets of wavelet-forming functions     

V. G. Alekseev  V. A. Sukhodoev 《Izvestiya Atmospheric and Oceanic Physics》2007,43(5):569-573

One of the most efficient tools of studying meteorological and climatic time series is wavelet analysis, which allows local properties of a nonstationary time series to be examined. New sets of continuous and discrete wavelet-forming functions are proposed. All proposed wavelets are finite (have a bounded carrier), even, and well localized in the spectral space.  相似文献   

First data on age of radiolarian assemblages from sedimentary dikes in suevites of the Kara impact structure     

V. S. Vishnevskaya  A. S. Alekseev 《Doklady Earth Sciences》2008,423(2):1366-1371

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Sc-bearing coals from Yakhlinsk deposit, Western Siberia     

V. V. Seredin  S. I. Arbuzov  V. P. Alekseev 《Doklady Earth Sciences》2006,409(2):967-972

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On two types of metalliferous carbonaceous rocks     

I. N. Tomson  O. P. Polyakova  V. Yu. Alekseev  V. A. Baskina 《Geology of Ore Deposits》2006,48(1):74-76

Two types of metalliferous carbonaceous rocks that differ in associated metals are considered. One of them is characterized by gold occurring in finely dispersed arsenopyrite and arsenic-bearing pyrite, and the other, by finely impregnated native metals in carbonaceous matter. Rocks of the first type also contain elements of the platinum group, while those of the second type bear rhenium, silver, iron, molybdenum, and other metals. Graphitic mineralization is usually localized in the shear zone associated with alkaline basalts.  相似文献   

Photospheric Spots and Flare on the Active Dwarf Star FR Cnc     

A. V. Kozhevnikova  V. P. Kozhevnikov  I. Yu. Alekseev 《Astrophysics》2018,61(1):30-40

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Geodynamic Evolution Model of the Major Structures of Amerasian Basin     

L. I. Lobkovsky  I. A. Garagash  D. A. Alekseev 《Doklady Earth Sciences》2018,480(2):753-757

We have analyzed the geodynamic evolution of the lithosphere and upper mantle of the Amerasian basin based on the stress-strain state simulation. It is shown that the asthenospheric spreading in the return upflow region of the mantle convection, results in formation of two local uplifts, which can be interpreted as Lomonosov Ridge and Mendeleev/Alfa Ridge. The further long-term action of the mantle convection leads to formation of Makarov and Podvodnikov Basins.  相似文献   

Theoretical and computational aspects of seismic tomography     

A. S. Alekseev  M. M. Lavrentiev  V. G. Romanov  M. E. Romanov 《Surveys in Geophysics》1990,11(4):395-409

This paper reviews aspects related to applications of seismic wave kinematics for the reconstruction of internal characteristics of an elastic medium. It presents the results of studying the inverse kinematic seismic problem and its linear analogue — problems of integral geometry, obtained in recent decades with an emphasis on the work done by Soviet scientists. Computational techniques of solving these problems are discussed. This review should be of interest to geophysicists studying the oceans, atmosphere and ionosphere as well as those studying the solid part of the Earth.  相似文献   

The flux deficits in star spots     

I. Yu. Alekseev  R. E. Gershberg  M. M. Katsova  M. A. Livshits 《Astronomy Reports》2001,45(6):482-496

The bolometric flux deficits of the photospheres of spotted stars are derived for the first time in the framework of zonal spottedness models for red dwarfs computed at the Crimean Astrophysical Observatory. The resulting flux deficits are compared to the estimated radiative losses from the chromospheres and coronas measured during quasi-simultaneous observations. A linear correlation is found between the logarithms of these quantities, with the Sun fitting these relations. Radiative losses from the outer stellar atmospheres in quiescence and during individual sporadic flares are significantly lower than the bolometric deficits of the spotted photospheres of active stars. This suggests that the flux deficit due to spots leads to global reconstruction of the atmospheres of red dwarfs, analogous to the local atmospheric reconstruction that occurs during solar and stellar flares. This process may be realized via the superposition of a large number of weak impulsive flares and other dynamic events, which develop on these stars and heat their coronas (i.e., in this view, microflaring is favored as the principal coronal heating mechanism for these stars). A brief analysis of the long-term variations in the chromospheric and photospheric radiation of F-K stars from the HK project and of the Sun suggests that such dynamical reconstruction of the outer atmosphere by energy associated with the flux deficit of the spotted photosphere occurs at times of increased surface activity in all F-M stars.  相似文献   

Seismic studies of low-velocity layers and horizontal inhomogeneities within the crust and upper mantle on the territory of the U.S.S.R.     

A.S. Alekseev  A.V. Belonosova  I.A. Burmakov  G.V. Krasnopevtseva  N.N. Matveeva  G.L. Nersessov  N.I. Pavlenkova  V.G. Romanov  V.Z. Ryaboy 《Tectonophysics》1973,20(1-4):47-56

Recent seismological studies of low-velocity layers in the U.S.S.R. have led to the development of new methods of investigation. The most important results obtained are presented in this paper. Several new techniques of record treatment and advanced computer programs make it possible to solve two-dimensional problems of seismic wave propagation in complex media and to outline zones of velocity inversion in the crust and mantle of many regions in the U.S.S.R.Zones of this type seem to occur only locally and are typical of some particular geostructures. Lateral inhomogeneities are also found to be closely related to geological features. Their depths sometimes can reach 300–400 km.  相似文献   

Role of sea ice in the formation of annual carbon dioxide cycle in the Arctic     

G. V. Alekseev  A. P. Nagurny 《Doklady Earth Sciences》2007,417(2):1398-1401

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