Three-dimensional radiometric model of a periodically perturbed water surface in the millimeter wave range and its experimental verification
Three-dimensional radiometric model of a periodically perturbed water surface in the millimeter wave range and its experimental verification
V.V. Gladun, S.E. Petukhov, Yu.A. Pirogov, D.A. Tishchenko
A three-dimensional model has been developed for self-radiation of a periodically perturbed water surface. The model is based on the perturbation method and allows one to obtain the spectrum of surface waves with the aid of non-contact measurements. The experimental data obtained for the case of two waves on the surface coincide with theoretical results to sufficient accuracy.
Show AbstractField distribution in the focal area of the Talbot cylindrical cavity
Field distribution in the focal area of the Talbot cylindrical cavity
V.P. Kandidov, A.V. Kondrat'ev
The distribution of the field formed by a laser lattice in the focal plane of the Talbot cylindrical cavity has been studied. A formula has been proposed for calculating the Talbot distance in a cylindrical geometry.
Show AbstractDirectivity of dispersive tsunami radiation and specific features of sea floor motion in the focus area
Directivity of dispersive tsunami radiation and specific features of sea floor motion in the focus area
M.A. Nosov, S.V. Mironyuk, N.K. Shelkovnikov
The process of tsunami generation by piston-like and membrane-like sea floor motions in an asymmetric focus area is investigated within the framework of linear potential theory. It was demonstrated that the wave radiation directivity and the total energy transmitted from the moving ocean sea floor depend essentially on the character and temporal law of sea floor motion in the focus.
Show AbstractВариации доз радиации на станции "Мир" при изменениях геофизических условий
Вариации доз радиации на станции "Мир" при изменениях геофизических условий
М.В. Тельцов, В.И. Шумшуров, В.В. Цетлин
На основе многолетних измерений доз радиации внутри орбитальной станции "Мир" исследуются вариации доз, связанные с 11-летним циклом солнечной активности, с сезонными изменениями потоков частиц радиационных поясов Земли на орбитах станции и с солнечными протонными вспышками.
Show AbstractФормализм функций линейного отклика типа "плотность-плотность" в методе многочастичных функционалов плотности
Формализм функций линейного отклика типа "плотность-плотность" в методе многочастичных функционалов плотности
О.С. Еркович
Работа посвящена реализации методов теории возмущений в формализме многочастичных функционалов плотности. Рассмотрено взаимодействие электронного газа вблизи поверхности металла с возмущающим внешним зарядом. Получено выражение для функции отклика электронного газа на внешнее возмущение типа "плотность - плотность". Результаты работы могут быть применены для расчета характеристик систем "металл - адсорбат"
Show AbstractOn bifurcation of the amplitude of forced Alfven oscillations
On bifurcation of the amplitude of forced Alfven oscillations
S.A. Markovskii
Tl1e forced nonlinear Alfven oscillations in a system with a discrete spectrum are considered. In such a system, the discreteness of the spectrum or dissipation may cause stabilization of unstable processes of interaction between the initial Alfven wave and small perturbations. For this case, a correction to the natural frequency of small stationary oscillations has been found. The bifurcation of the oscillation amplitude was shown to occur under changes of the driving force frequency. This effect must be taken into account when describing plasma dynamics in MHD resonators, such as the earth's polar ionosphere and solar coronal loops.
Show AbstractFinslerian kinematic transformations between moving reference frames
Finslerian kinematic transformations between moving reference frames
G.S. Asanov
The Finslerian kinematic approach [1-9] is applied to the case when the kinematic transformations refer to two moving reference frames. The respective explicit form for the transformation coefficients has been found.
Show AbstractTheory of NMR correlation experiments with relayed coherence transfer
Theory of NMR correlation experiments with relayed coherence transfer
V.S. Tumanov
Using the method of projection operators, two-dimensional NMR spectra have been calculated for correlation spectroscopy with relayed coherence transfer. Arbitrary first-order spectra from systems with three groups of equivalent nuclei have been discussed. Some general rules of calculations by the projection operator method are formulated.
Show AbstractNeutrino oscillations in a magnetized neutron star with consideration for the realistic equation of state
Neutrino oscillations in a magnetized neutron star with consideration for the realistic equation of state
A.M. Egorov, G.G. Likhachev, A.I. Studenikin
With consideration for the variation of the neutron star matter density described by the realistic equation of state we have considered in detail the "boundary effect" based upon neutrino oscillations in a magnetic field, i.e., the transition of half the active neutrinos under the influence of a magnetic field to the sterile state when leaving the neutron star. Basing upon the numerical calculations performed we have concluded that neutrino oscillations may become essential in the regions near the surface of the neutrino star and up to the distances of the order of 600 star radii.
Show AbstractCalculation of fundamental frequencies and radiative losses of open dielectric resonators
Calculation of fundamental frequencies and radiative losses of open dielectric resonators
A.A. Usankin
A numerical algorithm for calculating radiative losses and fundamental frequencies of open dielectric resonators having the form of a body of revolution with an arbitrary generatrix has been developed. It is shown that this algorithm can be applied to the study of modes of the whispering gallery type for high values of the azimuth index.
Show Abstract