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61.
62.
S. V. Veretenenko V. A. Dergachev P. B. Dmitriev 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(7):1010-1013
The long-period variations in the climatic position of the Arctic front in the North Atlantic have been investigated. It is found that oscillations of the Arctic front latitude near Greenland occur with main periods of ~80, ~44, and ~22 years; this finding indicates possible relationship of these oscillations with the solar activity and variations in galactic cosmic rays. It is shown that the secular oscillations of the Arctic front latitude can be responsible for the amplitude modulation of the 11-year harmonic in sea-level pressure variations in the North Atlantic. 相似文献
63.
M.I. KobetsK.G. Dergachev E.N. Khatsko S.L. GnatchenkoL.N. Bezmaternykh V.L. Temerov 《Physica B: Condensed Matter》2011,406(18):3430-3435
The AFMR spectra of the NdFe3(BO3)4 crystal are measured in a wide range of frequencies and temperatures. It is found that by the type of its magnetic anisotropy the compound is an “easy-plane” antiferromagnet with a weak anisotropy in the basal plane. The effective magnetic parameters are determined: anisotropy fields Ha1=1.14 kOe and Ha2=60 kOe and magnetic excitation gaps Δν1=101.9 GHz and Δν2=23.8 GHz. It is shown that commensurate-incommensurate phase transition causes a shift in resonance field and a considerable change in absorption line width.At temperatures below 4.2 K nonlinear regimes of AFMR excitation at low microwave power levels are observed. 相似文献
64.
Cosmogenic isotopes, including 14C, 10Be, and 7Be, are produced in the Earth’s atmosphere under the effect of cosmic rays. The rate of their production is determined by several factors, such as the intensity of primary galactic cosmic rays, the level of solar activity, and the strength of the Earth’s magnetic field. Changes in the isotope concentrations and distributions receive contributions from mixing processes proceeding in the surrounding medium: the atmosphere, biosphere, and oceans. The isotopes 14C and 10Be are the most important for studying solar activity and climate. Investigation of isotope concentrations reveal that there are both long-term trends and cyclic components. As for 14C, the long-term component caused by the change in the magnetic dipole moment of the Earth with a characteristic time of about 104 years is the most commonly known. It is well known that the concentrations of cosmogenic isotopes change cyclically with time. The ~2400-year cycle (Hallstatt cycle) and the ~210-year cycle (de Vries cycle) are the most famous. In the present article, we discuss the possible origin of the ~2400-year cycle. 相似文献
65.
Adrià Canós Valero Dmitrii Borovkov Aleksandr Kalganov Alexandra Dudnikova Mikhail Sidorenko Pavel Dergachev Egor Gurvitz Lei Gao Vjaceslavs Bobrovs Andrey Miroshnichenko Alexander S. Shalin 《Laser \u0026amp; Photonics Reviews》2024,18(4):2200740
Multipoles are paramount for describing electromagnetic fields in many areas of nanoscale optics, playing an essential role in the design of devices in plasmonics and all-dielectric nanophotonics. Challenging the traditional division into electric and magnetic moments, toroidal moments are proposed as a physically distinct family of multipoles with significant contributions to the properties of matter. However, the apparent impossibility of separately measuring their response sheds doubt on their true physical significance. Here, the possibility of selectively exciting toroidal moments is confirmed without any other multipole. A set of general conditions is developed that any current distribution must fulfill to be entirely described by toroidal moments and prove the results in an analytically solvable case. The new theory allows to design and verify experimentally an artificial structure supporting a pure broadband toroidal dipole response in the complete absence of the electric dipole and other “ordinary” multipole contributions. In addition, a structure capable of supporting a novel type of non-radiating source is proposed- a “toroidal anapole,” originating from the destructive interference of the toroidal dipole with the unconventional electromagnetic sources known as mean square radii. The results in this work provide conclusive evidence on the independent excitation of toroidal moments in electrodynamics. 相似文献