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We considered the problem dealing with the far field of internal gravity waves generated by the source oscillating in the
vertical. It is shown that, at a fixed observation point, we first record the arrival of the main wave front of a separate
mode followed by the arrival of two fronts of an additional field of this wave mode, which is caused by the oscillations of
the source, the asymptotics near the additional wave front being expressed via Airy function. 相似文献
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Atkin E. V. Bulatov V.L. Vasiliev O. A. Voronin A. G. Gorbunov N. V. Grebenyuk V. M. Dorokhov V. A. Karmanov D. E. Kovalev I.M. Kudryashov I. A. Kurganov A.A. Merkin M. M. Panov A.D. Podorozhny D. M. Polkov D. A. Porokhovoi S. Yu. Sveshnikova L. G. Tkachev L.G. Tkachenko A. V. Turundaevskiy A. N. Filippov S. B. Shumikhin V. V. 《Astronomy Reports》2019,63(1):66-78
Astronomy Reports - Some results of studies of cosmic rays obtained during the NUCLEON space experiment in 2015–2017 are presented. This experiment was intended for direct measurements of the... 相似文献
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E. A. Mareev V. N. Stasenko A. A. Bulatov S. O. Dement’eva A. A. Evtushenko N. V. Il’in F. A. Kuterin N. N. Slyunyaev M. V. Shatalina 《Izvestiya Atmospheric and Oceanic Physics》2016,52(2):154-164
This review contains the most significant results of Russian studies in the field of atmospheric electricity in 2011–2014. It is part of the Russian National Report on Meteorology and Atmospheric Sciences to the International Association of Meteorology and Atmospheric Sciences (IAMAS). The report was presented and approved at the XXVI General Assembly of the International Union of Geodesy and Geophysics (IUGG).1 The review is followed by a list of the main published works on the studies of atmospheric electricity of Russian scientists in 2011–2014. 相似文献
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Geobarometry for Peridotites: Experiments in Simple and Natural Systems from 6 to 10 GPa 总被引：3，自引：0，他引：3
Experiments with peridotite minerals in simple (MgO–Al2O3–SiO2,CaO–MgO–SiO2 and CaO–MgO–Al2O3–SiO2)and natural systems were conducted at 1300–1500°Cand 6–10 GPa using a multi-anvil apparatus. The experimentsin simple systems demonstrated consistency with previous lowerpressure experiments in belt and piston–cylinder set-ups.The analysis of spatial variations in pyroxene compositionswithin experimental samples was used to demonstrate that pressureand temperature variations within the samples were less than0·4 GPa and 50°C. Olivine capsules were used in natural-systemexperiments with two mineral mixtures: SC1 (olivine + high-Alorthopyroxene + high-Al clinopyroxene + spinel) and J4 (olivine+ low-Al orthopyroxene + low-Al clinopyroxene + garnet). Theexperiments produced olivine + orthopyroxene + garnet ±clinopyroxene assemblages, occasionally with magnesite and carbonate-richmelt. Equilibrium compositions were derived by the analysisof grain rims and evaluation of mineral zoning. They were comparedwith our previous experiments with the same starting mixturesat 2·8–6·0 GPa and the results from simplesystems. The compositions of minerals from experiments withnatural mixtures show smooth pressure and temperature dependencesup to a pressure of 8 GPa. The experiments at 9 and 10 GPa producedandradite-rich garnets and pyroxene compositions deviating fromthe trends defined by the lower pressure experiments (e.g. higherAl in orthopyroxene and Ca in clinopyroxene). This discrepancyis attributed to a higher degree of oxidation in the high-pressureexperiments and an orthopyroxene–high-P clinopyroxenephase transition at 9 GPa. Based on new and previous resultsin simple and natural systems, a new version of the Al-in-orthopyroxenebarometer is presented. The new barometer adequately reproducesexperimental pressures up to 8 GPa. KEY WORDS: garnet; mineral equilibrium; multi-anvil apparatus; orthopyroxene; geobarometry 相似文献
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Izvestiya, Atmospheric and Oceanic Physics - This paper considers the problem of generating internal gravity waves that arise when a stratified flow with a shear flow runs into a single underwater... 相似文献
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Izvestiya, Atmospheric and Oceanic Physics - The problem of the far field of internal gravity waves (IGWs) from the instantaneous radially symmetric isopycnal elevation is solved. The constant... 相似文献
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Doklady Earth Sciences - 相似文献
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Asymptotic representations of solutions describing the far fields of internal gravity waves in a stratified medium of varying depth are constructed. The effect of space-frequency cutoff of the wave field for a real oceanic shelf is revealed. Depending on frequency characteristics of the wave field and bottom topography, far fields of internal waves either are located in a certain confined space domain (trapped waves) or propagate in the absence of turning points over sufficiently large distances when compared with the sea depth (progressive waves). The space domain where the progressive waves penetrate is fully determined by the presence of turning points whose locations depend on the medium stratification and inhomogeneities of bottom topography. 相似文献
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Izvestiya, Atmospheric and Oceanic Physics - The problem of constructing solutions that describe internal gravity waves in a stratified medium with finite depth and multidirectional shear flows has... 相似文献