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Elansky N. F. Shilkin A. V. Ponomarev N. A. Zakharova P. V. Kachko M. D. Poliakov T. I. 《Izvestiya Atmospheric and Oceanic Physics》2022,58(1):80-94
Izvestiya, Atmospheric and Oceanic Physics - The location of Moscow on a plain within higher latitudes when compared to other megacities creates conditions for the chemical transformation of... 相似文献
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Principles of the transportation mechanism for a large number of interacting discrete solid particles were developed thanks to the progress in physics and mechanics of granular media. Velocity fluctuations and nonelastic collisions of fragments or their aggregates lead to the liquefaction of the clastic mass-flow, providing its travel over a long distance and simultaneously producing its sorting and stratification. Results of laboratory and field investigations carried out during the last 15 years with the use of high-precision equipment showed that this transportation mechanism is typical of slumps, debris flows, grain flows, high-density turbidity currents, and bottom avalanche transport. The universality of this mechanism made it possible to simplify the classification of subaqueous gravitational processes, propose an idealized scheme of bottom erosion processes, and interpret the Bouma cycle sequence. 相似文献
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Below the melt lens of fast spreading ridges, a low seismic velocity zone has been identified. From the study of ophiolite gabbros, in particular in Oman, this domain has been interpreted as a large magma chamber filled by a melt-poor mush where granular flow controlled by pressure solution-crystallization predominates over plastic flow. Melt migration through the mush is difficult to study in the field because the large magmatic flow taking place in this magma chamber has erased nearly all traces of migration paths. It is, however, still possible to identify sills and former dikes, now largely transposed into the layering. Physical traces for porous flow are rare, but petrological and geochemical evidence suggests that it also contributed to melt migration. Finally, in the lower gabbro horizons large magmatic folds and brecciated zones may bear evidence for magmatic intrusions. The combination of diking, porous flow and large-scale intrusions to carry melt through the magma chamber may be explained by the granular behaviour of the medium. It is suggested that the melt film present between grains and clots of grains reduces the large cohesive forces which characterize a solid, plastic, medium. Melt migration through the mush may thus depend on the size of cohesive clots, evolving through time and space, from porous flow to diking and melt intrusions for increasing larger clots. This process is illustrated by a physical experiment on pressurized air circulation through a granular medium. 相似文献
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S. V. Poliakov B. I. Reznikov A. V. Shchennikov E. A. Kopytenko B. V. Samsonov 《Seismic Instruments》2017,53(1):1-18
This paper reports the long-term teamwork results obtained by an expert group from the Radiophysical Research Institute (NIRFI) and VEGA Geophysics Ltd. (VEGA, St. Petersburg) in the course of designing modern induction-coil magnetic field sensors. A comparative analysis of the world’s most famous sensor models is carried out, and basic design and testing methods and features are considered. The range of low-noise induction-coil magnetometers (IMS-007, IMS-008, and IMS-009) designed by the authors for scientific and geophysical ground-based explorations is described. Research results are obtained from using the sensors for geothermal water exploration by broadband magnetotelluric sounding, investigation of the deep structure of the lithosphere by controlled source electromagnetic sounding, and monitoring of the Earth’s natural electromagnetic field. 相似文献
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Diapirism and topography 总被引：1，自引：0，他引：1
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