排序方式： 共有39条查询结果，搜索用时 15 毫秒
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Grigory I. Dolgikh Mstislav N. Dubrov Stanislav G. Dolgikh Sergei N. Kovalev Vladimir V. Ovcharenko Egor A. Savvin Vladimir A. Chupin Vyacheslav A. Shvets Sergei V. Yakovenko 《Acta Geophysica》2006,54(2):187-197
The paper considers possibilities of applying laser strainmeters for the study of earthquake physics. One of laser strainmeters
is described. A high efficiency of using the laser strainmeters for the study of earthquakes and their precursors is shown.
In records of the spaced laser strainmeters, anomalous deformations propagating from the east to the west with the speed comparable
with that of migration of earthquakes were found. 相似文献
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Solar faculae are among the most common manifestations of solar activity and can play an important role in the energy transfer from the lower solar atmosphere into the corona. However, the mechanisms by which energy is transferred remain insufficiently studied. Our work is based on observational data obtained with the AST telescope of the Sayan solar observatory. Simultaneous observations were performed in the Hα 6563 Å and FeI 6569 Å, BaII 4554 Å and FeI 4551.6 Å, and CaII 8542 Å and FeI 8538 Å pairs of spectral lines. The studies indicated that the spectral composition of the line-of-sight (LOS) velocity oscillations in faculae is inhomogeneous and is affected by the chromospheric network’s structural elements. The possible presence of short and low magnetic loops in the facula region makes it difficult to determine the unambiguous phase relations between chromospheric and photospheric oscillations. The LOS velocity oscillation signals registered at the chromospheric level both lead and lag behind the signals registered at the photospheric level. At the same time, signs of propagating waves are evidently registered in the chromosphere of individual faculae. 相似文献
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G. I. Dolgikh S. S. Budrin S. G. Dolgikh A. A. Plotnikov V. A. Chupin V. A. Shvets S. V. Yakovenko 《Russian Meteorology and Hydrology》2016,41(8):559-563
The results of the experiments on the registration of hydrosphere pressure variations are analyzed. The experiments were conducted in 2011, 2012, and 2014 using the laser meter ofhydrosphere pressure variations and the laser hydrophone in some bays of the Posyet Gulf in the Sea of Japan. Basic attention is given to the wind waves and fundamental modes of free oscillations in the bays. 相似文献
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G. I. Dolgikh S. G. Dolgikh V. A. Chupin Yu-Hung Hsiao 《Doklady Earth Sciences》2016,471(2):1257-1260
This paper is focused on analysis of comprehensive experimental research data on the infragravitational range of periods (from 20 s to 10–12 min) obtained by synchronous measurements of fluctuations in deformations of the Earth’s crust and atmospheric and hydrospheric pressure variations. It is established that the identified variations in the period range of 1–4 min are rarely observed in records of a laser nanobarograph and laser instrument for measuring hydrospheric pressure variations (laser hydrophone), while they are frequently observed in records of laser strainmeters at a variation period of 3–4 min. Oscillation excitation in the period ranges of 7–13 min, especially in the period ranges of 8–12 min, is largely related to atmospheric processes in the corresponding periods. 相似文献
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Reducing vertical acceleration in ballast layers of railways to mitigate geometrical disorders in high‐speed lines 
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下载免费PDF全文 According to field feedbacks from high‐speed lines (HSL), the increase of train operating speeds is responsible for unusual fast evolving geometrical disorders in ballasted tracks. This paper deals with the search of solutions applicable at the design stage to mitigate these disorders. The starting point of the present work relies on the assumption, comforted by the literature, of a strong correlation between disorders and vertical accelerations in the ballast layer induced by the train passages. This led us focus herein on the calculation and the analysis of accelerations in the railway structure. The vertical accelerations (γz) are computed using the in‐house developed numerical program ViscoRail and on the basis of a reference HSL. These are shown to increase strongly with the train speed attesting to the link between the train speed and the geometrical disorders in ballast. Then, other simulations are run varying some structural parameters to evaluate their impact on the acceleration field γz. In that way, we show that decreasing the stiffness of the mechanical connection between the rails and the ballast, increasing the moment of inertia of the rails or the Young modulus of the sub‐ballast layer, leads to a decrease of γz and could provide solutions for the design of future HSL. The solution consisting in the incorporation of an asphalt sub‐ballast layer, as already experimented on sites, is finally examined in more details. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
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Dolgikh G. I. Plotnikov A. A. Dolgikh S. G. Chupin V. A. Yakovenko S. V. 《Doklady Earth Sciences》2010,430(1):104-107
On the basis of experimental data on hydrospheric pressure variations, obtained with the use of a laser hydrophone and laser
gauge of hydrospheric pressure variations, while hydroacoustic radiators were running, generating hydroacoustic waves at frequencies
of about 32, 245, and 421 Hz in water, it was established that there is no modulating action of wind sea waves on the propagating
hydroacoustic signals along the “radiator-receiver” trace, within the limits of experimental error and the processing methods
used. 相似文献
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Grigory I. Dolgikh Stanislav G. Dolgikh Sergei N. Kovalev Vladimir V. Ovcharenko Vladimir A. Chupin Vyacheslav A. Shvets Sergei V. Yakovenko 《Acta Geophysica》2007,55(4):607-618
The experimental data in the microseismic frequency range obtained using the seismo-acoustic-hydrophysical measurement complex
are analyzed. The emphasis is put on estimating the ratio between the energy of surface sea wind waves in the area of the
Japan Sea where the complex was located and the Earth’s crust microdeformations in this frequency range. The experimental
evaluate obtained allow us to estimate the energy re-distribution at the hydrosphere-lithosphere boundary. 相似文献