Физика список научных статей

Single-phase barium hexaferrite powders with crystallite sizes in a single-domain region and with the general composition BaFe12−xMnxO19, where x = 0, 2, 4, 6, were synthesized applying a citric sol-gel auto-combustion technique with final annealing temperatures of 900 – 1200 ºC. The crystal...

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The technique of AFM bending test of a suspended nanoobject has been improved. An analytical method has been created for calculating Young’s and shear moduli of object’s material based on data of such tests. In Timoshenko approximation, we consider problems of bending a beam one or both ends of...

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The Schrödinger operators with constant magnetic field in a bent chain and Y-type chain of coupled balls are considered. Coupling exists due to point-like openings at the touching points of neighbor spheres. The mathematical background of the model is the theory of self-adjoint extensions of...

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We studied photon antibunching in the pump and the harmonic modes of the sixth harmonic generation process. The generalized interaction Hamiltonian is solved for several particular cases in the Heisenberg picture, and the possibility of observing photon antibunching is investigated using the...

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Magnetic skyrmions are considered promising candidates for coding bits of information in racetrack memory devices. Information recording in such devices is assumed to occur by creating skyrmions. This work is devoted to finding solutions to make this process as energy-efficient as possible. One of...

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Carbon films were obtained by magnetron sputtering of graphite in an argon atmosphere on various metal substrates. As a result, a “metal-semiconductor” junction is formed due to the fact that the temperature dependence of the film resistance is of a semiconductor nature. The current-voltage...

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We propose a mathematical model to fit the temperature-dependent thermal conductivity of M1−xRxF2+x heterovalent solid solutions where M stands for alkaline-earth metals and R for rare-earth metals. These solid solutions experience composition-driven transition from the crystal-like to glass-like...

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The Z-matrix of a simple graph Γ is a square symmetric matrix, whose rows and columns correspond to the vertices of the graph and the ijth entry is equal to the sum of the degrees of ith and jth vertex, if the corresponding vertices are adjacent in Γ, and zero otherwise. The Zagreb eigenvalues of Γ ...

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Three series of films were obtained by magnetron sputtering of the composite C-Ni target with different ratios C/Ni (vol.%) = 60/40; 40/60; 30/70. The effect of the substrate temperature on the structure and the size of film-forming nickel nanocrystallites with a carbon shell was studied with using ...

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The processes in a system of nanoparticles of a concentrated colloidal solution of magnetite induced by laser light with a wavelength of 650 μm have been studied. It was found that radiation focused on a drying drop of this substance, under certain conditions, leads to the formation of large...

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We consider the problem of energy cost needed for acceleration (deceleration) of the evolution of a quantum system using the Masuda–Nakamura’s fast forward protocol. In particular, we focus on dynamics by considering models for a quantum box with a moving wall and harmonic oscillator with...

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The temperature dependences of the electrical resistivity of topological insulator Bi2Se3 thin films with thicknesses of 20 and 40 nm were measured in the temperature range from 4.2 to 80 K. Their resistivity was shown to depend on thickness. A method was proposed for “separation” of the bulk and...

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Using density functional theory, evolution of geometrical and electrical properties like wall width, binding energy, strain energy, band structure, density of states etc. of several zigzag HgSe nanotubes with diameters in the range of 11.59 to 21.74 A are systematically investigated. It is noted...

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In this work, a set of crystalline LiYF4:Nd3+ nanoparticles with an average size of about 35 nm, were successfully synthesized via laser ablation method in liquid (combination of ethanol and water). The samples have trigonal structure corresponding to LiYF4 host. The spectral and kinetic...

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Впервые установлен неизвестный ранее единый разнотемпературно обусловленный угловой начальный электромагнитный потенциал, обмотки эллипсовидного статора орбитального котла ядра Солнца с вращающимися магнитными полями и электромагнитными излучениями нечетным числом порядкового номера I группы I...

В статье приведены расчетная схема и математическая модель судового валопровода. Приведены результаты имитационного моделирования в виде графиков зависимости углов поворота торцевых сечений от времени разгона вала. Показано, что в начальный момент времени возникают колебательные явления в сечениях...

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Коэффициенты нелинейной функции демпфирования механической системы с одной поступательной степенью свободы определяются по экспериментально полученной осциллограмме свободных колебаний. Функция моделируется тремя видами трения: сухим, линейно-вязким и нелинейно-вязким. Определяются численные...

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В статье дается обзор известных эффектов, оказывающих влияние на передачу информации по оптоволокну и возникающих в результате грозовых разрядов: электрооптический эффект Керра, эффект Фарадея, влияние ионизирующих излучений. Указывается на то, что имеются предварительные эмпирические данные,...

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Работа посвящена построению асимптотически оптимальных уравнений гиперболического погранслоя в тонких оболочках вращения в окрестности фронта волны расширения при ударных торцевых воздействиях тангенциального типа. Соотношения выводятся методом асимптотического интегрирования точных трехмерных...

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В работе построена математическая модель колебаний микрополярных цилиндрических оболочек сетчатой структуры под действием вибрационных и температурных воздействий. Материал оболочки упругий, ортотропный, однородный, моделируемый псевдоконтинуумом Коссера, со стесненным вращением частиц. Принят...

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