Almost Periodic and Asymptotically Almost Periodic Solutions of Liénard Equations

The aim of this paper is to study the almost periodic and asymptotically almost periodic solutions on (0,+1) of the Li´enard equation x′′ + f(x)x′ + g(x) = F(t), where F : T ! R (T = R+ or R) is an almost periodic or asymptotically almost periodic function and g : (a, b) ! R is a strictly decreasing function. We study also this problem for the vectorial Li´enard equation. We analyze this problem in the framework of general non-autonomous dynamical systems (cocycles). We apply the general results obtained in our early papers [3, 7] to prove the existence of almost periodic (almost automorphic, recurrent, pseudo recurrent) and asymptotically almost periodic (asymptotically almost automorphic, asymptotically recurrent, asymptotically pseudo recurrent) solutions of Li´enard equations (both scalar and vectorial)

Stator current limiting in variable-frequency electrical drive with scalar control system

The problem of stator current limiting of asynchronous electrical drive under overload is reviewed. Task of research is stated. Mathematical model of simplest scalar control system with current limiter and results of mathematical modeling of electrical drives in stator limiting modes are included.Рассматривается проблема ограничения тока статора асинхронного электропривода при перегрузке. Дается постановка задачи исследования. Приводятся математическая модель простейшей скалярной системы с отсечкой по току и результаты математического моделирования процессов электропривода в режимах ограничения тока статора

Experimental Vaccines for Prevention of Marburg Hemorrhagic Fever and Animal Models for Studying Pathogenesis

Marburg fever is an acute natural-focal disease characterized by severe course, hemorrhagic syndrome, high level of contagiousness and lethality. The causative agent of the disease is the RNA-containing virus belonging to the family of filoviruses (Filoviridae). The main problem faced by doctors and scientists involved in the fight against Marburg fever is the lack of vaccines and preventive drugs against this disease. The development of effective vaccines against filovirus infection is relevant for protecting the population living in natural foci and medical personnel during epidemic outbreaks, as well as for ensuring safe research work in BSL-4 laboratories. In this regard, this review considers biomodels suitable for studying the pathogenesis of filovirus infections, preclinical studies of specific activity and harmlessness of prototype Marburg virus vaccines and variants of these vaccines

Abelian Sandpile Model on the Husimi Lattice of Square Plaquettes

An Abelian sandpile model is considered on the Husimi lattice of square plaquettes. Exact expressions for the distribution of height probabilities in the Self-Organized Critical state are derived. The two-point correlation function for the sites deep inside the Husimi lattice is calculated exactly.Comment: 12 pages, LaTeX, source files and some additional information available at http://thsun1.jinr.dubna.su/~shcher

Base of scientific and biomedical data the object formation of competencies in the discipline of biochemistry of Medical schools

The article describes the algorithm of formation of cultural and professional competences of students in medical University during research work with the use of web services created based on biomedical databasesВ статье описывается алгоритм формирования общекультурных, общепрофессиональных и профессиональных компетенций у обучающихся в медицинском вузе при проведении научно-исследовательской работы (НИР) с применением веб-сервисов, созданных на основе биомедицинских баз данны

Supplementary material for the article: Milenković, M.; Shcherbakov, I. N.; Popov, L. D.; Levchenkov, S. I.; Borodkin, S. A.; Alexandrov, G. G. Synthesis, Characterization and Crystal Structures of Ni(II) and Cu(I) Complexes with the Condensation Product of 2-(Diphenylphosphino)Benzaldehyde and 1-Hydrazinophthalazine. Polyhedron 2017, 121, 278–284. https://doi.org/10.1016/j.poly.2016.10.020

Supplementary material for: [https://doi.org/10.1016/j.poly.2016.10.020]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2368]Related to accepted version: [http://cherry.chem.bg.ac.rs/handle/123456789/3256

Dissecting X-ray-emitting Gas around the Center of our Galaxy

Most supermassive black holes (SMBHs) are accreting at very low levels and are difficult to distinguish from the galaxy centers where they reside. Our own Galaxy's SMBH provides a uniquely instructive exception, and we present a close-up view of its quiescent X-ray emission based on 3 mega-second of Chandra observations. Although the X-ray emission is elongated and aligns well with a surrounding disk of massive stars, we can rule out a concentration of low-mass coronally active stars as the origin of the emission based on the lack of predicted Fe Kalpha emission. The extremely weak H-like Fe Kalpha line further suggests the presence of an outflow from the accretion flow onto the SMBH. These results provide important constraints for models of the prevalent radiatively inefficient accretion state.Comment: 18 pages, 5 PDF figures, pdflatex format; Final version, published in Scienc

Critical Dynamics of Self-Organizing Eulerian Walkers

The model of self-organizing Eulerian walkers is numerically investigated on the square lattice. The critical exponents for the distribution of a number of steps ($\tau_l$) and visited sites ($\tau_s$) characterizing the process of transformation from one recurrent configuration to another are calculated using the finite-size scaling analysis. Two different kinds of dynamical rules are considered. The results of simulations show that both the versions of the model belong to the same class of universality with the critical exponents $\tau_l=\tau_s=1.75\pm 0.1$.Comment: 3 pages, 4 Postscript figures, RevTeX, additional information available at http://thsun1.jinr.dubna.su/~shche

Light-emitting-diode Fourier-transform spectroscopy of HD16O between 11200 and 12400 cm-1

The absorption spectrum of monodeuterated water, HDO has been investigated between 11200 and 12400 cm-1. The spectrum has been recorded using IFS-125M interferometer with spectral resolution of 0.05 cm-1. For measurements White’s-type cell were used. The bright light emitting diode (LED) EDEI-1LS3-R was applied as a source of radiation. Signal to noise ratio was about 104. The spectral line parameters - line positions, intensities and half-widths were obtained by least square fitting. As a result of the spectrum analysis the line list containing more than 1500 lines was created. The spectral line parameters have been compared with the previous measured and calculated data. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only