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排序方式: 共有67条查询结果,搜索用时 15 毫秒
31.
32.
E. S. Nesterov Z. K. Abuzyarov G. A. Grigor’eva I. N. Davidan V. I. Dymov T. A. Pasechnik 《Russian Meteorology and Hydrology》2011,36(10):669-676
An estimate of the computation accuracy of wind waves is obtained on the basis of three mathematical models used for the diagnosis and forecast of wind waves at the Hydrometcenter of Russia, US National Weather Service, and European Centre for Medium-Range Weather Forecasts. The accuracy estimation was carried out for the whole year 2006 by means of the comparison of model computations based on different wind fields with hourly instrumental observations of waves at 16 buoys in the North Atlantic. The computation accuracy was estimated on the basis of six statistical characteristics. Besides, the estimates for various wave height ranges for months and seasons of the year are made for all buoys and grouped into three geographical areas: the coasts of the United States, Canada, and Great Britain. The essential differences are revealed in the accuracy of model-based computation of waves in the areas of the ocean with different wind wave regimes, in different seasons of the year, and within various wave height ranges. The obtained results indicate the necessity to improve the present-day methods of diagnosis and forecast of wind waves. 相似文献
33.
Studied are the formation processes of dangerous wind waves in the water area of the North Atlantic during three cold periods
(October–March) from 2007 to 2010. Obtained are the estimates of variability of cyclone trajectories, wind fields, and wave
height in the North Atlantic at the intensification of zonal or meridional atmospheric circulation. 相似文献
34.
35.
V.A. Kashirtsev I.I. Nesterov V.N. Melenevskii E.A. Fursenko M.O. Kazakov A.V. Lavrenov 《Russian Geology and Geophysics》2013,54(8):958-965
Chromato-mass-spectrometric studies made it possible to identify a wide spectrum of hydrocarbon biomarkers in crude oils from Cenomanian pools of northern West Siberia (Russkoe, Pangodinskoe, Van-Eganskoe, Severo-Komsomol’skoe). The distribution pattern of the main hydrocarbon components (n-alkanes, acyclic isoprenanes, steranes, terpanes) shows that most of the oils underwent intense microbial oxidation. We have established high concentrations of 25-norhopanes typical of high-degree degradation; demethylated hopanes are also revealed in “alkane” crude oils. Among low-molecular chemofossils, bi- and tricyclic mono and sesquiterpanes have been recognized, whose precursors are usually biomolecules synthesized by plants. Unsaturated precursors of mono and sesquiterpanes might have been the starting material for thermocatalytical synthesis of framework adamantanoid structures, whose high concentrations have been found in alkane-free crude oils. 相似文献
36.
Aboozar Garavand Yuri Pavlovich Stefanov Yuri Leonidovich Rebetsky Rustam Alfredovich Bakeev Artem Veniaminovich Myasnikov 《国际地质力学数值与分析法杂志》2020,44(6):823-850
In many wellbore stability analyses, the ability to forecast both the occurrence and extent of plastic deformation and failure hinges upon a fundamental understanding of deformation mode and failure mechanism in the reservoir rock. This study focuses on analyzing plastic zones, localized deformations, and failures around a borehole drilled overbalanced or underbalanced through a highly porous rock formation. Based on several laboratory experiments, porous rocks are prone to deform under both shear-induced dilation and shear-enhanced compaction mechanisms depending on the stress state. The shapes of the deformation and failure patterns around the borehole are shown, depending on the initial stress state and the local stress paths. The inquiry of the local stress paths in the near-wellbore zone facilitates the understanding of the reasons for different types of failure mechanisms, including the mixed-mode and the plastic deformation structures. The modification of the 2D plane strain condition by imitating third stress in the numerical scheme helps us bring the stress paths closer to the real state of loading conditions. Our modeling reveals that the transition from isotropic to anisotropic stress state is accompanied by an increase in the deviatoric part of effective shear tensor that leads to the development of inelastic deformation, degradation, and subsequent rock failure. Particular interest is devoted to the modeling of strain localization especially in compaction mode around a wellbore and computing the amount of stress concentration at the tips of dog-eared breakouts. Stress concentration can result in a change in irreversible deformation mode from dilatancy to compaction, elucidating the formation of the shear-enhanced compaction phenomenon at the failure tips in the direction of the minimum horizontal stress. 相似文献
37.
E. S. Nesterov 《Russian Meteorology and Hydrology》2010,35(10):680-686
The formation conditions of 21 explosive cyclone in the northeastern part of the Atlantic Ocean in 1986–1999 are analyzed.
The typical values are determined of some characteristics of the atmosphere and ocean accompanying the explosive cyclogenesis:
North Atlantic Oscillation and East Atlantic Oscillation indices, air and water temperature, sensible and latent heat fluxes. 相似文献
38.
Analyzed are the reasons of extreme waves with the height of more than 14 m formed in the North Atlantic in 2002–2011 and the evolution of atmospheric processes causing the extreme waves. It is revealed that the extreme waves in the North Atlantic during that period were mainly (in 81% of cases) formed under the influence of “explosive” cyclones. The height of waves in these cyclones can reach 20 m and more. 相似文献
39.
Naumenko M. A. Guzivaty V. V. Nesterov N. A. Sybetto D. A. 《Doklady Earth Sciences》2019,486(1):585-587
Doklady Earth Sciences - A digital bathymetric model with a 10 × 10 m spatial resolution was created on the basis of the depth sounding on the southwestern slope of Valaam Island with the use... 相似文献
40.
The 325-MHz observations of the quasar OH 471 (z=3.4) in 1985–1996 revealed variability of its radio emission. Over this period, its radio flux density increased by a factor of 1.6. A steep-spectrum radio source was identified $2_.^\prime 5$ north of the quasar. Its radio flux density is 1.46 mJy at 5 GHz and 14.5 mJy at 350 MHz. 相似文献