Investigation of dynamic processes in the period of formation and development of the blocking anticyclone over European Russia in summer 2010     

P. N. Vargin  A. N. Luk’yanov  A. V. Gan’shin 《Izvestiya Atmospheric and Oceanic Physics》2012,48(5):476-495

The blocking anticyclone (BA) observed in the summer of 2010 over the European part of Russia led to enormous economical damage, substantially increased the mortality of the population, and had serious negative consequences for human health. Dynamic processes in the troposphere, i.e., wave trains, which could contribute to anticyclone formation and sustenance, are investigated. In order to study these wave trains, three-dimensional Plumb vectors have been calculated and analyzed. It is shown that, in June 2010, three wave trains propagated eastward in the troposphere over the Atlantics. The first two wave trains, having reached Europe, continued to propagate in eastern and southeastern directions. Only the third wave train, upon reaching Europe, continued to propagate toward the northeast and, on June 17–19, entered northwestern Russia. The anticyclone, which started to form on June 18 precisely in this region, subsequently developed into a stable BA observed over European Russia up to mid-August. The propagation direction of the wave trains could change due to the formation of a double structure of the zonal flow in the troposphere. The wave trains are revealed in the middle of June in regions with increased cloudiness over the northwestern part of the Atlantic Ocean and over the northwestern and northern parts of the central United States. Eastwardpropagating wave trains, which could contribute to the intensification of the corresponding BAs that brought anomalously high temperatures to European Russia, were also revealed in July and August of 2010 and 1972. The calculated 10-day backward trajectories are analyzed to determine the character of motions of air particles that penetrated into the anticyclone over the region of Moscow during the 2010 summer in the period of its development.  相似文献   

Tachylyte in Cenozoic basaltic lavas from the Czech Republic and Iceland: contrasting compositional trends     

Ulrych  Jaromír  Krmíček  Lukáš  Teschner  Claudia  Řanda  Zdeněk  Skála  Roman  Jonášová  Šárka  Fediuk  Ferry  Adamovič  Jiří  Pokorný  Richard 《Mineralogy and Petrology》2017,111(5):761-775

Mineralogy and Petrology - Tachylytes from rift-related volcanic rocks were recognized as: (i) irregular veinlets in host alkaline lava flows of the Kozákov volcano, Czech Republic, (ii)...  相似文献   

Hydrological and hydrochemical studies in the central and Southern Caspian Sea aboard the R/V Issledovatel’ Kaspiya (September 6–24, 2005)     

V. V. Sapozhnikov  D. N. Katunin  O. N. Luk’yanova  K. V. Batrak  A. Azarenko 《Oceanology》2006,46(3):446-448

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Energy conservation in the restricted elliptical three-body problem     

L. G. Luk’yanov 《Astronomy Reports》2005,49(12):1018-1027

The energy conservation law for the elliptical three-body problem is derived using an invariant relation corresponding to the Jacobi integral in the circular problem. The minimum-energy surfaces are constructed, which transform in the case of zero eccentricity into zero-velocity surfaces. Some astronomical applications of the results are considered. In particular, it is shown that Roche-lobe overflow displays pulsational behavior in the elliptical three-body problem.  相似文献   

Thermodynamics of the vacuum     

L. Diósi  B. Lukács  K. Martinás  G. Paál 《Astrophysics and Space Science》1986,122(2):371-386

The fact that the energy-momentum tensor has nonzero vacuum expectation value in some space-times (the so-called back reaction) indicates a nontrivial thermodynamics of such vacua. A consequent thermodynamic analysis of the problem in Robertson-Walker space-times shows that, in the generic case, the number of the independent extensives is 2, in spite of the fact that the energy density is completely determined by the time-evolution of the geometry since the preparation of the vacuum state. The appearance of a second independent extensive seems to be in direct connection with the extra entropy term in theGeneralized Second Law of Bekenstein and Hawking.  相似文献   

Typomorphic characteristics of the Ural diamonds (from FTIR spectroscopy data)     

E.N. Fedorova  A.M. Logvinova  L.I. Luk’yanova  N.V. Sobolev 《Russian Geology and Geophysics》2013,54(12):1458-1470

Natural diamonds from the Ural alluvial deposits have been studied by FTIR spectroscopy. It is shown that these diamonds are similar in some typomorphic features, such as nitrogen content and aggregation state, to the diamonds of the Coromandel (Brazil) and Verkhnee Molodo (Lena region, Yakutia) placers and to the diamonds from kimberlites of the Arkhangel’sk Region but differ significantly in lower contents of hydrogen and higher contents of platelets. The high contents of hydrogen (5–20 cm–1) determined in some diamonds are due to the specific formation of their internal structure and to the presence of inclusions. The nonuniform distribution of nitrogen A- and B-centers throughout the crystal testifies to the zonal structure of diamonds. The temperature conditions of formation of the Ural diamonds have been estimated.  相似文献   

The spatial distribution of the lignite qualitative parameters and variant estimates of coal reserves: the Czech Part of the Vienna Basin     

Jan Jelínek  František Staněk  Lukáš Vebr  Josef Honěk 《International Journal of Earth Sciences》2014,103(4):1113-1123

The aim of this article is to inform about the spatial distribution of the lignite qualitative parameters and total lignite reserves in the Czech Part of the Vienna Basin—The South Moravian Lignite Coalfield (SMLC). The total reserves were estimated on the basis of several composed variant digital models of individual seams in four partial area of SMLC. Calculations of the reserves resulted from the identified spatial distribution of chemical-technological parameters obtained from the thousands analysis of samples taken from more than 4,000 exploration works. The basic model of the deposit was so-called geological model characterising genetic evolution of the deposit and defines the spatial positions of the coal seams. Subsequently developed variant economical models spatially define the selected areas by the quality of lignite expressed by the limits of ash yield. Based on the created models, it was found that in the past just 3–7 % (depending on the variant model) of the total lignite reserves SMLC had been extracted. The presented geological reserves are currently using the existing mining technologies only partially mineable.  相似文献   

Geochemistry of the Drahotín and Mutěnín intrusions, West Bohemian shear zone, Bohemian massif: contrasting evolution of mantle-derived melts     

Lukáš Ackerman  Martina Krňanská  Wolfgang Siebel  Ladislav Strnad 《Mineralogy and Petrology》2010,99(3-4):185-199

In western Bohemia, the Drahotín (gabbro-diorite) and Mutěnín (gabbronorite-diorite-syenite) intrusions show different origins and patterns of geochemical evolution. Parental magmas of the Drahotín intrusion were derived predominantly from enriched mantle sources, and the melts have undergone a significant degree of assimilation-fractional crystallization (AFC) during their ascent and/or emplacement into the crust. In contrast, the compositional variation of the complex Mutěnín intrusion cannot be explained by simple AFC processes, but more likely reflects the involvement of several parental magmas. The gabbronorite was derived from a depleted mantle source, whereas the diorite/syenite stem from a mixed mantle-crust reservoir. The contrasting evolution of the Drahotín and Mutěnín intrusions may be due to their melt derivation and magma emplacement under different tectonothermal regimes at different times.  相似文献   

Heating of Ions by Small-Scale Electric Field Inhomogeneities in the Auroral Ionosphere During Geomagnetic Disturbances     

D.?V.?ChuguninEmail author  M.?V.?Klimenko  A.?A.?Chernyshov  V.?V.?Klimenko  A.?A.?Il’yasov  R.?Yu.?Luk’yanova 《Geomagnetism and Aeronomy》2018,58(1):50-61

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Assumption Hunting in Groundwater Modeling: Find Assumptions Before They Find You          下载免费PDF全文

Luk J. M. Peeters 《Ground water》2017,55(5):665-669

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