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Yakov Afanasyev 《地球物理与天体物理流体动力学》2013,107(2):79-95
Results from a new series of experiments on the geophysically important issue of spontaneous emission of internal gravity waves during unsteady interactions of vortical structures are presented. Vortex dipoles are a common element of a quasi-two-dimensional turbulent flow. Vortex dipoles perform translational motion and can collide with other vortices. During collision events the flow is unsteady and unbalanced and a further adjustment process associated with these events can therefore result in the spontaneous emission of gravity waves. Our laboratory experiments demonstrate that gravity waves are emitted when two translating vortex dipoles interact (collide) in a layered fluid, in accord with the current theoretical results. The emission was evident both in a two-layer system and in a fluid with a linear distribution of density with depth. The waves were generated during the period of deceleration of the secondary dipoles which constitute a vortex quadrupole emerging immediately after the collision of the primary dipoles. 相似文献
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Yakovenchuk Victor N. Ivanyuk Gregory Yu. Pakhomovsky Yakov A. Panikorovskii Taras L. Britvin Sergei N. Krivovichev Sergey V. Shilovskikh Vladimir V. Bocharov Vladimir N. 《Mineralogy and Petrology》2018,112(1):111-121
Mineralogy and Petrology - Kampelite, Ba3Mg1.5Sc4(PO4)6(OH)3·4H2O, is a new Ba-Sc phosphate from the Kovdor phoscorite-carbonatite complex (Kola Peninsula, Russia). It is orthorhombic, Pnma,... 相似文献
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正1 Introduction Annually laminated(varve)sedimentary deposits are considered as one of the most important archives,since they offer precise temporal information(years)in combination with high time resolutions.Bottom sediments of the lakes contain detailed geochemical information on 相似文献
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P. B. Price D. M. Lowder A. J. Westphal R. D. Wilkes R. A. Brennen V. G. Afanasyev V. V. Akimov V. G. Rodin G. K. Baryshnikov L. A. Gorshkov N. I. Shvets O. S. Tsigankov 《Astrophysics and Space Science》1992,197(1):121-143
The goals of the TREK experiment, now in place on the MIR Space Station, are to resolve and measure the composition of both odd-Z and even-Z cosmic-ray nuclei up to uranium, to measure the isotopic composition of Fe-group nuclei, and to search for transuranic nucleic and exotic particles such as strangelets. To collect tracks of ultraheavy cosmic rays, exterior panels holding an array of BP-1 phosphate glass 1.2m2 in area and 16 plates thick are now mounted outside the Kvant-2 module on MIR. Heaters and relays regulate the temperature of the glass at 25°±5°C. The detectors will record 103 cosmic-ray tracks withZ50 during 2.5 years. An interior panel consisting of an array 0.09 m2 in area and 32 plates thick and mounted on the inside wall of the Soyuz spacecraft (attached to the Space Station) will collect tracks of about 13000 Fe and 500 Ni nuclei. 相似文献
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Oceanology - Field observations were applied to study the macrophytobenthos of the Abrau Peninsula of the Black Sea and the effect of the two most common and largest species of brown algae of the... 相似文献
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The propagation of a fast magnetoacoustic shock wave the magnetosphere of a solar active region is considered the nonlinear geometrical acoustics approximation. The magnetic field is modeled as a subphotospheric magnetic dipole embedded in the radial field of the quiet corona. The initial parameters of the wave are specified at a spherical surface in the depths of the active region. The wave propagates asymmetrically and is reflected from regions of the strong magnetic field, which results in the radiation of the wave energy predominantly upwards. Substantial gradients in the Alfvén speed facilitate appreciable growth in the wave intensity. Non-linear damping of the wave and divergence of the wave front lead to the opposite effect. Analysis of the joint action of these factors shows that a fast magnetoacoustic perturbation outgoing from an active region can correspond to a shock wave of moderate intensity. This supports the scenario in which the primary source of the coronal wave is an eruptive filament that impulsively expands in the magnetosphere of an active region. 相似文献
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V. V. Grechnev A. N. Afanasyev A. M. Uralov I. M. Chertok M. V. Eselevich V. G. Eselevich G. V. Rudenko Y. Kubo 《Solar physics》2011,273(2):461-477
On 17 January 2010, STEREO-B observed in extreme ultraviolet (EUV) and white light a large-scale dome-shaped expanding coronal
transient with perfectly connected off-limb and on-disk signatures. Veronig et al. (Astrophys. J. Lett.
716, L57, 2010) concluded that the dome was formed by a weak shock wave. We have revealed two EUV components, one of which corresponded
to this transient. All of its properties found from EUV, white light, and a metric type II burst match expectations for a
freely expanding coronal shock wave, including correspondence with the fast-mode speed distribution, while the transient sweeping
over the solar surface had a speed typical of EUV waves. The shock wave was presumably excited by an abrupt filament eruption.
Both a weak shock approximation and a power-law fit match kinematics of the transient near the Sun. Moreover, the power-law
fit matches the expansion of the CME leading edge up to 24 solar radii. The second, quasi-stationary EUV component near the
dimming was presumably associated with a stretched CME structure; no indications of opening magnetic fields have been detected
far from the eruption region. 相似文献
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