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ИССЛЕДОВАНИЕ ОСЕСИММЕТРИЧНЫХ НЕСТАЦИОНАРНЫХ КОЛЕБАНИЙ ЭЛЕКТРОМАГНИТОУПРУГОЙ ТОЛСТОСТЕННОЙ СФЕРИЧЕСКОЙ ОБОЛОЧКИ С ИСПОЛЬЗОВАНИЕМ ЧИСЛЕННОГО ОБРАЩЕНИЯ ПРЕОБРАЗОВАНИЯ ЛАПЛАСА
С. 67-69.
Malashkin A. V., Тарлаковский Д. В., Вестяк В. А., Терлецкий Р. Ф.
Numerical simulation of the oscillation thick walled shell electromagnetoelasticity
Вестяк В. А., Malashkin A. V., Тарлаковский Д. В., В кн. : Сучасні проблеми механіки і математики : збірник наукових праць Міжнародної наукової конференції (Львів, 21-25 травня 2013 р., Львів). Т. 3.: Львов : Ін-т прикладних проблем механіки і математики ім. Я.С. Підстригача НАН України, 2013. С. 80-82.
Решение задачи о колебаниях толстостенной электромагнитоупругой сферы с помощью численного обращения преобразования Лапласа ...
Added: December 18, 2013
Ruderman M.., Petrukhin N., Astronomy and Astrophysics 2017 Vol. 600 No. A122 P. 1-11
The ability of phase mixing to provide efficient damping of Alfvén waves even in weakly dissipative plasmas made it a popular mechanismforexplainingthesolarcoronalheating.Initiallyitwasstudiedintheequilibriumconfigurationswiththestraightmagnetic fieldlinesandtheAlfvénspeedonlyvaryinginthedirectionperpendiculartothemagneticfield.LatertheanalysisoftheAlfvénwave phase mixing was extended in various directions. In particular it was studied in two-dimensional planar magnetic plasma equilibria. Analytical investigation was carried out under the assumption that the wavelength is much smaller ...
Added: May 10, 2017
Ruderman M. S., Petrukhin N., Pelinovsky E., Solar Physics 2021 Vol. 296 Article 124
In this article we study the plasma motion in the transitional layer of a coronal loop randomly
driven at one of its footpoints in the thin-tube and thin-boundary-layer (TTTB) approximation. We introduce the average of the square of a random function with respect to time. This
average can be considered as the square of the oscillation amplitude ...
Added: August 18, 2021
Ruderman M. S., N. S. Petrukhin, Solar Physics 2023 Vol. 298 Article 125
We study kink and fluting waves in expanding and twisted magnetic flux tubes. We use the
thin-tube and zero-beta plasma approximations. The equilibrium magnetic field is force free
with a constant proportionality coefficient between the electrical current and the magnetic
field. We derive the equation governing the kink and fluting waves in a tube. Using this
equation we study ...
Added: December 3, 2023
Ruderman M. S., Petrukhin N., Monthly Notices of the Royal Astronomical Society 2024 Vol. 528 No. 3 P. 4829-4837
We study kink oscillations of the system of two parallel magnetic tubes in the presence of plasma cooling. We assume that the characteristic cooling time is much larger than the characteristic time of kink oscillations. Using the ratio of two characteristic times as a small parameter, we derive the expression for the adiabatic invariant, which ...
Added: February 14, 2024
М. : Издательство математико-механического факультета МГУ, 2009
В настоящий сборник вошли аннотации докладов участников XVI международной конференции «Ломоносов» по секции «Математика и механика». ...
Added: February 4, 2013
Petrukhin N., Ruderman M. S., Monthly Notices of the Royal Astronomical Society 2021 Vol. 501 P. 3017-3029
We study kink oscillations of a straight magnetic tube with a transitional region at its boundary. The tube is homogeneous in the axial direction. The plasma density monotonically decreases in the transitional region from its value inside the tube to that in the surrounding plasma. The plasma motion is described by the linear magnetohydrodynamic equations ...
Added: January 23, 2021
Ruderman M. S., N. S. Petrukhin, Monthly Notices of the Royal Astronomical Society 2023 Vol. 523 No. 2 P. 2074-2082
We study oscillations of two parallel interacting magnetic tubes in the presence of plasma flow along the tubes. Using the cold plasma and thin tube approximations we derive the system of two equations describing these oscillations. This system of equations is valid for equilibria where the plasma density and flow velocity can vary along the ...
Added: July 26, 2023
I. A. Bakunina, Abramov-Maximov V. E., Smirnova V. V., Journal of Physics: Conference Series 2016 Vol. 675 No. 3 P. 1-6
This work presents the microwave long-term oscillations with periods of a few tens of minutes obtained from Nobeyama radioheliograph (NoRH) at frequency 17 GHz. In two active regions the fluctuations of radio emission of different types of intersunspot sources (ISS) (compact and extended) were compared with the fluctuations in magnetic fields of sunspots. Common periods ...
Added: February 25, 2016
Irina A. Bakunina, Abramov-Maximov V., Nakariakov V. et al., Publications of the Astronomical Society of Japan 2013 Vol. 65 No. SP1 P. S13-1-S13-12
Long-term oscillations of microwave emission generated in sunspot magnetospheres are detected with the Nobeyama Radioheliograph (NoRH) at a frequency of 17 GHz, and the Siberian Solar Radio Telescope (SSRT) at 5.7 GHz. Significant periodicities in the range of 22–170 min are found in the variation of the emission intensity, polarisation and the degree of circular polarisation. Periods of ...
Added: December 30, 2013
Извекова Ю. Н., Popel S., Извеков О. Я., Физика плазмы 2020 Т. 46 № 1 С. 72-77
The possibility of excitation of oscillations in a Schumann resonator in the atmosphere of Mars is discussed. On Earth, the main source of energy in the resonator cavity are thunderstorms at tropical latitudes. On Mars, electric phenomena are possible during dust events such as dust columns and dust storms. The charging of dust grains in a dust column ...
Added: April 3, 2020
Smirnov A. D., Экономический журнал Высшей школы экономики 2012 Т. 16 № 4 С. 444-463
Статья посвящена изучению проблем осцилляций в экономике, а именно изучению случайно изменяющихся спроса и предложения коротких кредитов. Для изучения циклического характера динамики спредов предлагается использовать модель возмущенного осциллятора первого порядка. ...
Added: January 25, 2013
СПб. : Издательство Санкт-Петербургского университета, 2008
В сборнике представлены результаты исследований по механике сплошной среды, в основном задач колебаний и устойчивости упругих конструкций. Характерной чертой исследований является использование разнообразных компьютерных методов: методов вычислительной механики сплошной среды, компьютерной алгебры, визуализации и др. Анализ опирается на сопоставление данных, полученных в различных подходах, причем наиболее часто сопоставляются результаты, полученные асимптотическими методами и по методу ...
Added: February 4, 2013
Ruderman M., Petrukhin N., Astronomy and Astrophysics 2019 Vol. 631 P. A31-1-A31-12
ABSTRACT
The effect of siphon flow on kink oscillations of magnetic flux tubes is studied in the thin tube and thin boundary layer (TTTB) approximation. The presence of a transitional layer results in oscillation damping due to resonance absorption. To calculate the damping rate we use the regular perturbation method with the ratio of transitional layer ...
Added: October 17, 2019
Mikheev A. V., Известия Санкт-Петербургского государственного электротехнического университета ЛЭТИ 2015 № 10 С. 7-9
The question of calculation of local stability of two-layered shells of type (1,k) on an elas-tic bases is considered. The dependence of critical load parameter on of the ratio of the stiff-ness and rigidity of the base layers is obtained. ...
Added: October 25, 2015
S. S. Akbarov, Journal of Algebra and its Applications 2020 Vol. 19 No. 6 P. 1-28
We prove several properties of kernels and cokernels in the category of augmented involutive
stereotype algebras: 1) this category has kernels and cokernels, 2) the cokernel is preserved under the
passage to the group stereotype algebras, and 3) the notion of cokernel allows to prove that the continuous
envelope Env C*(Z · K) of the group algebra of ...
Added: June 8, 2019
Mikheev A. V., Известия Санкт-Петербургского государственного электротехнического университета ЛЭТИ 2013 № 10 С. 3-5
The question of local stability of cylindrical shells of medium length with elastic filling for three methods of fixing the edges: rigid fixing at both ends, rocker bearing - rigid fixing, rocker bearing at both ends is considered. The dependence of critical load parameter on the stiffness parameter for three types of boundary conditions in ...
Added: January 3, 2014
Akbarov S. S., Итоги науки и техники. Современная математика и ее приложения. Тематические обзоры 2017 Т. 129 С. 3-133
Since the first optical instruments have been invented, an idea that the visible image of an object under observation depends on tools of observation became commonly assumed in physics. A way of formalizing this idea in mathematics is the construction that assigns to an arbitrary object A in a category K its envelope Env^Ω_ Φ A in a given class Ω ...
Added: October 21, 2018
Mikheev A. V., В кн. : Тезисы докладов. Секция «Математика и механика» международной конференции студентов, аспирантов и молодых ученых «Ломоносов – 2009». : М. : Издательство математико-механического факультета МГУ, 2009. С. 93-94.
При решении задачи устойчивости ортотропных оболочек на упругом основании под действием безмоментных начальных усилий рассматривается модель, учитывающая предварительные напряжения в основании. Получена зависимость параметра критической нагрузки от относительной жесткости основания. В качестве инструмента исследований используется метод малых вариаций исследуемого напряженно - деформированного состояния в линейной постановке, а также метод локального подхода. Основание локально моделируется упругим ...
Added: February 4, 2013
Lyshov S., Ivanov I., Uvaysov S. U., В кн. : Инновации на основе информационных и коммуникационных технологий: материалы международной научно-технической конференции (2012). : М. : МИЭМ НИУ ВШЭ, 2012. С. 272-274.
В работе описаны экспериментальные исследования в области вибродиагностики с использованием встроенных источников колебаний в диапазоне частот от 50 до 1000 Гц с постоянной амплитудой. ...
Added: December 20, 2012
Akbarov S. S., Journal of Mathematical Sciences 2017 Vol. 227 No. 5 P. 531-668
Since the first optical instruments have been invented, an idea that the visible image of an object under observation depends on tools of observation became commonly assumed in physics. A way of formalizing this idea in mathematics is the construction that assigns to an arbitrary object A in a category K its envelope Env^Ω_ Φ A in a given class Ω ...
Added: October 21, 2018
Akbarov S. S., Итоги науки и техники. Современная математика и ее приложения. Тематические обзоры 2017 Т. 130 С. 3-112
Since the first optical instruments have been invented, an idea that the visible image of an object under observation depends on tools of observation became commonly assumed in physics. A way of formalizing this idea in mathematics is the construction that assigns to an arbitrary object A in a category K its envelope Env^Ω_ Φ A in a given class Ω ...
Added: October 21, 2018
Н. Новгород : Национальный исследовательский университет Высшая школа экономики в Нижнем Новгороде, 2014
Added: November 21, 2014
Zhozhikashvili N., Nurislamova Y., Novikov N. et al., , in : VII International Conference Aspects of Neuroscience, Warsaw, Poland (November 24-26). : Warsz. : Faculty of Biology University of Warsaw, 2017. Ch. 28. P. 78-79.
Successful performance in cognitive tasks relies on the deployment of cognitive control mechanisms including non-specific regulation of motor threshold and modulation of attentional processes specific to the task. Failure of each of the two mechanisms may lead to different kind of responses, post-response adaptations and, importantly, distinctive behavior correlates. In particular, slow correct and erroneous ...
Added: March 2, 2020