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E. I. Marchenko N. N. Eremin A. Yu. Bychkov A. E. Grechanovskii 《Moscow University Geology Bulletin》2017,72(5):299-304
Semi-empirical and quantum chemical studies of Al atom energy in CaSiO3 and MgSiO3 with the perovskite-type structure at pressures and temperatures of the Earth’s mantle are reported. The phase diagram for CaSiO3 is reproduced and refined. Probable mechanisms of Al incorporation in the structures studied are considered. According to the results of the calculations, Al is preferably incorporated into MgSiO3, rather than into CaSiO3. Evaluation of the isomorphic capacity of perovskite phases in relation to Al shows that the Al content in MgSiO3 may reach 2.4 mol % at 120 GPa and 2400 K. CaSiO3 cannot be a source of Al atoms in the Earth’s mantle. 相似文献
3.
Thermodynamic effects accompanying freezing of two water layers separated by a sea ice sheet 总被引:1,自引:0,他引:1
Laboratory modeling results of freezing a system of fresh and seawater layers separated by a sea ice sheet are presented and analyzed. They are supplemented by calculations using a thermodynamic model [1] modified for the laboratory conditions. 相似文献
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O. S. Shalygina V. V. Korokhin L. V. Starukhina E. V. Shalygin G. P. Marchenko Yu. I. Velikodsky O. M. Starodubtseva L. A. Akimov 《Solar System Research》2008,42(1):8-17
We present new results obtained from the analysis of the seasonal variations in the asymmetry of polarization of light reflected by Jupiter. From the 23-year set of observations, the anticorrelation between the asymmetries of polarization and insolation has been revealed. The mechanism explaining the observed seasonal variations of polarization has been proposed. The core of this mechanism is the effect of temperature changes in the planetary stratosphere on the processes of the stratospheric aerosol haze formation. Additional irregular factors that may influence the observed polarization asymmetry are considered. 相似文献
6.
N. A. Diansky A. V. Marchenko I. I. Panasenkova V. V. Fomin 《Russian Meteorology and Hydrology》2018,43(5):313-322
The iceberg drift model is developed and used for simulating the iceberg drift trajectory in the Barents Sea. The model is forced by hydrometeorological characteristics obtained from ship observations. Original techniques for retrieving the sea-level slope gradient and surface velocity of currents are proposed, implemented, and validated using independent data. Thus, additional data were calculated from field data in order to use the iceberg drift model with the full set of external forces. This allowed improving the iceberg trajectory simulation and assessing the contribution of all forces that affect the iceberg drift. The iceberg drift calculations demonstrate that the drift characteristics are extremely sensitive to all external effects and the model parameters; therefore, the quality of input hydrometeorological data essentially affects the simulation of real iceberg trajectories. 相似文献
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Aleksey Marchenko Nicolai Vasiliev Artem Nesterov Yuri Kondrashov Nikolay Belyaev 《寒旱区科学》2017,9(3):192-196
Measurements of the thermal deformations of frozen soil samples were performed in the cold laboratory in temperature range from 0°C to-12°C.Fiber Bragg Gratings strain and temperature sensors were used to measure the deformation and temperature inside the samples.A number of tests with the samples prepared from Kaolin and Cambrian clay saturated with fresh water,and prepared from fine and silt sand saturated with fresh or saline water,are performed.Thermal deformations of the samples are analyzed depending on the cyclic changes of their temperature. 相似文献
8.
Jin Huijun Jin Xiaoying He Ruixia Luo Dongliang Chang Xiaoli Wang Shaoling Marchenko Sergey S Yang Sizhong Yi Chaolu Li Shijie Harris Stuart A 《中国科学:地球科学(英文版)》2019,62(8):1207-1223
The formation and evolution of permafrost in China during the last 20 ka were reconstructed on the basis of large amount of paleo-permafrost remains and paleo-periglacial evidence, as well as paleo-glacial landforms, paleo-flora and paleofauna records. The results indicate that, during the local Last Glacial Maximum(LLGM) or local Last Permafrost Maximum(LLPMax), the extent of permafrost of China reached 5.3×106-5.4×106 km2, or thrice that of today, but permafrost shrank to only0.80×106-0.85×106 km2, or 50% that of present, during the local Holocene Megathermal Period(LHMP), or the local Last Permafrost Minimum(LLPMin). On the basis of the dating of periglacial remains and their distributive features, the extent of permafrost in China was delineated for the two periods of LLGM(LLPMax) and LHMP(LLPMin), and the evolution of permafrost in China was divided into seven periods as follows:(1) LLGM in Late Pleistocene(ca. 20000 to 13000-10800 a BP)with extensive evidence for the presence of intensive ice-wedge expansion for outlining its LLPMax extent;(2) A period of dramatically changing climate during the early Holocene(10800 to 8500-7000 a BP) when permafrost remained relatively stable but with a general trend of shrinking areal extent;(3) The LHMP in the Mid-Holocene(8500-7000 to 4000-3000 a BP)when permafrost degraded intensively and extensively, and shrank to the LLPMin;(4) Neoglaciation during the late Holocene(4000-3000 to 1000 a BP, when permafrost again expanded;(5) Medieval Warming Period(MWP) in the late Holocene(1000-500 a BP) when permafrost was in a relative decline;(6) Little Ice Age(LIA) in the late Holocene(500-100 a BP), when permafrost relatively expanded, and;(7) Recent warming(during the 20 th century), when permafrost continuously degraded and still is degrading. The paleo-climate, geography and paleopermafrost extents and other features were reconstructed for each of these seven periods. 相似文献
9.
Optical light curves of three blazars are analyzed by Hurst’s method of normalized range. It is shown that Hurst’s empirical
relationship is satisfied for these curves, in accordance with which the Hurst parameters are found for each curve. Assuming
that blazar light curves have self-affinity, they determine the fractal dimensionality of the curves to be D ≈ 1.1.
Translated from Astrofizika, Vol. 40, No. 3, pp. 341–348, August, 1997. 相似文献
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