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1.
The high diversity of grain-size parameters of marine and oceanic sediments is determined by hydrodynamical and gravitational processes. Grain-size spectra of the sediments in the World Ocean are represented by two main types. Filtering organisms that passively inherit the proportions of clayey fractions in suspended matter only accelerate the deposition of fine particles, not influencing their distribution at the bottom. 相似文献
2.
A. P. Geptner Yu. I. Pikovskii L. T. Protasevich T. A. Alekseeva M. E. Ramenskaya 《Lithology and Mineral Resources》2003,38(6):509-521
Relationships of mineralized microbiota with the content of polycyclic aromatic hydrocarbons in hydrothermal systems are considered. It has been established that the mineralized microbiota can serve as an indicator of hydrothermal hydrocarbon flows in present-day and ancient deposits. 相似文献
3.
M. D. Kravchishina V. P. Shevchenko A. S. Filippov A. N. Novigatskii O. M. Dara T. N. Alekseeva V. A. Bobrov 《Oceanology》2010,50(3):365-385
The grain-size and mineral composition of the suspended particulate matter (SPM) of the Severnaya Dvina River mouth is studied,
as well as the content of several lithogenic elements in the SPM during the spring flood in May 2004. The data published on
the composition of the riverine SPM in the White Sea basin are very poor. The spring flood period when more than half of the
annual runoff is supplied from the river to the sea in a short time is understood more poorly. The report considers the comparison
results for the grain-size compositions of the SPM and the bottom sediments. The data of laser and hydraulic techniques of
the grain-size analysis are compared. The short-period variations of the SPM concentration and composition representing two
diurnal peaks of the tide level are studied. It is found that the SPM is mainly transferred during the spring flood as mineral
aggregates up to 40 μm diameter. The sandysilty fraction of the riverine SPM settles in the delta branches and channels, and
the bulk of the fine pelitic matter is supplied to the sea. The mineral and chemical composition of the Severnaya Dvina River
SPM is determined by the supply of substances from the drainage basin. This substance is subjected to intense mechanic separation
during the transfer to the sea. The key regularities of the formation of the mineral composition of the SPM during the flood
time are revealed. The effect of the grain-size composition of the SPM on the distribution of the minerals and elements studied
in the dynamic system of the river mouth are characterized. 相似文献
4.
E. V. Ruban G. A. Alekseeva A. A. Arkharov E. I. Hagen-Thorn V. D. Galkin I. N. Nikanorova V. V. Novikov V. P. Pakhomov T. Yu. Puzakova 《Astronomy Letters》2006,32(9):604-607
We present the results of our visual and near-infrared spectrophotometric observations for 77 variable stars obtained during 1971–1991 in Chile, Armenia, and Bolivia. The quasi-monochromatic, extraatmospheric fluxes from the stars are given in absolute energy units (W m?2 m?1) at all wavelengths of the spectral range at 2.5-nm intervals. 相似文献
5.
A physical-statistical approach to the severe squall forecasting is considered. It is based on the output data of the regional hydrodynamic model of Hydrometeorological Center of Russia. By using the multi-dimensional discriminant analysis of a chosen set of predictors, a number of relationships are developed for the severe squall prediction; estimates of forecasting efficiency are presented for these relationships on the developmental sample. Physical interpretation of the obtained relationships is given. 相似文献
6.
B. E. Peskov A. A. Alekseeva A. E. Nikiforova 《Russian Meteorology and Hydrology》2008,33(10):644-650
The physical-synoptic principles of the automated method of summer precipitation forecasting introduced into operational prognostic practice in 2006 by the decree of the Central Methodical Commission of the Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet) are presented. Beside that, improved modifications of this method, which are automatically updated, are shown. Validation of those updates based on observational data collected in 2004 has shown improvement of all major criteria of forecasts efficiency. The performed improvement is based on the more detailed quantitative realization of mechanism of various showers formation (including heavy rainfalls). 相似文献
7.
Alekseeva T. A. Raev M. D. Tikhonov V. V. Sokolova J. V. Sharkov E. A. Frolov S. V. Serovetnikov S. S. 《Izvestiya Atmospheric and Oceanic Physics》2021,57(9):1076-1080
Izvestiya, Atmospheric and Oceanic Physics - The Arctic Sea ice area, calculated by the VASIA2 algorithm using the SSMIS data during the most intensive melting of the ice cover in 2019, is compared... 相似文献
8.
Gordeev V. V. Dara O. M. Alekseeva T. N. Kochenkova A. I. Boev A. G. Lokhov A. S. Belorukov S. K. 《Oceanology》2020,60(3):384-392
Oceanology - The paper presents the first results of a study of seasonal variations in the grain size distribution and mineral compositions of suspended particulate matter (SPM) of the Northern... 相似文献
9.
I. S. Kim I. V. Alekseeva I. V. Mironova A. R. Osokin V. V. Popov E. Z. Suyunova 《Geomagnetism and Aeronomy》2016,56(8):993-997
According to measurements of the magnetic fields in quiescent prominences carried out by different teams in 1964–1989, the maximum values of the field correspond to the minimum values of the Wolf numbers averaged through the corresponding periods of observations. It has been shown that the synoptic noneclipse 2D linear polarimetry of quiescent Hα-prominences can be actually implemented; this method is based on the use of a coronagraph with a primary-optics diameter equal to or larger than 100 mm, a narrow-band filter with FWHM ≤ 0.4 nm, a standard linear polariod, and a high-precision linear polarimetric technique. 相似文献
10.
S. V. Alekseev L. P. Alekseeva S. L. Shvartsev N. S. Trifonov E. S. Sidkina 《Geochemistry International》2017,55(5):442-456
One of the probable mechanisms that controls the composition of highly mineralized chloride groundwaters is studied using physicochemical numerical simulations of equilibria in water–rock systems. Concentrated brines in the Olenek cryoartesian basin in the northeastern Siberian Platform are determined to be undersaturated with respect of major rock-forming minerals, which suggests that the metamorphosed sedimentary brines should have been diluted by meteoric waters during a certain evolutionary episode of the permafrost zone of the basin in the Late Pleistocene and Holocene. 相似文献