Effect of magnetic field on the velocity autocorrelation and the caging of particles in two-dimensional Yukawa liquids

We investigate the effect of an external magnetic field on the velocity autocorrelation function and the "caging" of the particles in a two-dimensional strongly coupled Yukawa liquid, via numerical simulations. The influence of the coupling strength on the position of the dominant peak in the frequency spectrum of the velocity autocorrelation function confirms the onset of a joint effect of the magnetic field and strong correlations at high coupling. Our molecular dynamics simulations quantify the decorrelation of the particles' surroundings - the magnetic field is found to increase significantly the caging time, which reaches values well beyond the timescale of plasma oscillations. The observation of the increased caging time is in accordance with findings that the magnetic field decreases diffusion in similar systems

Influence of the ion core on relaxation processes in dense plasmas

The effect of an ionic core on the temperature relaxation in dense hot plasma of beryllium is studied using the pseudpotential model by Gericke et al [Phys. Rev. E 2010, 81, 065401(R)]. Employing the screened version of the ion pseudpotential [by Ramazanov et al, Phys. Plasmas 2021, 28 (9), 092702], we computed the quantum transport cross-section for the electron-ion collisions in dense beryllium plamsas, where screening is taking into account using the density response function in the long wavelength regime. The results for the transport cross-section are used to compute a generalised Coulomb logarithm and electron-ion collision frequency. Utilizing the latter, we show the effect of the ionic core on the temperature relaxation. To understand the role of the ionic core, we compare the results with the data computed considering ions as point-like charges

Осмотический демиелинизирующий синдром

ABSTRACT. This article discusses the clinical cases of rare and difficult to diagnose brain damage — osmotic demyelinating syndrome (ODS). ODS is a lifethreatening condition, manifested by acute demyelination of the headbrain on the background of water-electrolyte disturbances,usually associated with fast management of hyponatremia. Within the framework of ODS, central pontine myelinolysis (CPM) and extra-pontine myelinolysis (EPM) are observed, which are accompanied by acute demyelination in the pons and white matter of the cerebral hemispheres, respectively. In 60%, CPM combine with EPM. The main reason for the development of ODS is a violation of water-electrolyte metabolism associated with alcohol abuse, chronic hepatic and/or renal failure, diabetes mellitus, Sheehan syndrome, polydipsia, condition after the removal of pituitary adenoma, bulimia, immunodeficiency syndrome. Today, the diagnosis of ODS is based on magnetic resonance imaging of the brain. The article indicates the main causes of the disease, clinical features, methods of diagnosis and treatment, as well as the outcomes of the disease.РЕЗЮМЕ. Данная статья посвящена обсуждению клинических случаев редкого и трудно диагностируемого поражения головного мозга — осмотического демиелинизирующего синдрома (ОДС). ОДС — жизнеугрожающее состояние, проявляющееся остро возникающей демиелинизацией головного мозга на фоне водно-электролитных нарушений, как правило, связанных с быстрой коррекцией гипонатриемии. В рамках ОДС выделяют центральный понтинный миелинолиз (ЦПМ) и экстрапонтинный миелинолиз (ЭПМ), которые сопровождаются острой демиелинизацией в области моста и белого вещества больших полушарий головного мозга соответственно. В 60% ОДС сочетает в себе ЦПМ и ЭПМ. Основная причина развития ОДС — нарушения водно-электролитного обмена, возникающие на фоне злоупотребления алкоголем, хронической печеночной и/или почечной недостаточности, сахарного диабета, синдрома Шихана, полидипсии, состояния после удаления аденомы гипофиза, булимии, синдрома иммунодефицита. В настоящее время диагнос- тика ОДС основана на данных магнитно-резонансной томографии головного мозга. В статье ука- заны основные причины заболевания, клинические особенности, методы диагностики и лечения, а также исходы заболевания

Dynamical correlations and collective excitations of Yukawa liquids

In dusty (complex) plasmas, containing mesoscopic charged grains, the grain-grain interaction in many cases can be well described through a Yukawa potential. In this Review we summarize the basics of the computational and theoretical approaches capable of describing many-particle Yukawa systems in the liquid and solid phases and discuss the properties of the dynamical density and current correlation spectra of three- and two-dimensional strongly coupled Yukawa systems, generated by molecular dynamics simulations. We show details of the $\omega(k)$ dispersion relations for the collective excitations in these systems, as obtained theoretically following the quasilocalized charge approximation, as well as from the fluctuation spectra created by simulations. The theoretical and simulation results are also compared with those obtained in complex plasma experiments.Comment: 54 pages, 31 figure

ИНФАРКТ ГОЛОВНОГО МОЗГА КАК ПЕРВОЕ ПРОЯВЛЕНИЕ ЭРИТРЕМИИ

The article reports a clinical case of the stroke on the background of newly diagnosed polycythemia vera. Possible mechanisms of the stroke in the course of erythremia as well ascurrent methods oftreatment for the disease are described.В статье представлен клинический случай развития инсульта на фоне впервые выявленной истинной полицитемии. Рассмотрены возможные механизмы развития инсульта при эритремии. Представлены современные методы лечения данной патологии