1,956 research outputs found
Numerical SPIS-Dust Modelling of Plasma – Lunar Lander Interactions
No full textInternational audienceThis paper presents first results of SPIS-DUST modelling of the interaction between the lunar plasma environment , regolith and a lander. The model takes into account the geometry of the Luna-Glob lander, the electric properties of materials used on the lander surface, as well as Luna-Glob landing place. Initial conditions were chosen based on the current theoretical models of formation of dusty plasma exosphere and levitating charged dust particles
Numerical SPIS-Dust Modelling of Plasma – Lunar Lander Interactions
No full textInternational audienceThis paper presents first results of SPIS-DUST modelling of the interaction between the lunar plasma environment , regolith and a lander. The model takes into account the geometry of the Luna-Glob lander, the electric properties of materials used on the lander surface, as well as Luna-Glob landing place. Initial conditions were chosen based on the current theoretical models of formation of dusty plasma exosphere and levitating charged dust particles
Journal of a second expedition into the interior of Africa, from the bight of Benin to Soccatoo.
No full text"A list, or summary account, of the late Captain Clapperton's Arabic papers, translated by Mr. A.V. Salemé" : p. [389]-395.; "A list, or summary account of the late Captain Clapperton's Arabic papers, translated by Mr. A.v. Salemé": pages 389-395
The Life and Vegetating
No full textFor several years, A.V. Suvorov has been doing mailing lists for like-minded colleagues and friends. Each of the letters is a scientific and journalistic text on philosophical, psychological, pedagogical, and life topics. A.V. Suvorov signed his letters "Hedgehog" - that's how he called himself, meaning not only prickly, but also the desire to isolate himself for a while, shrink, withdraw into himself from the world, so that he could then turn to him with something important. We bring to your attention his latest essay, or rather, the last revision of the text that he wrote almost a quarter of a century ago. The author reflects on how to overcome universal, collective and individual, personal nonsense as a way of existence. In his opinion, didactics is intended to provide a means of understanding existence.</p
Teaching foreign students argumentation on the example of A.V. Vampilov’s “The elder son”
No full textThe article concerns ways of teaching argumentation to foreign students learning Russian as a foreign language. The author characterizes extracts of A.V. Vampilov's “The Elder Son” where different verbal persuasive means showing menthality, specifiс way of thinking and world perception of the Russians are presented
Large-eddy simulation of turbulent channel flow using the explicit algebraic subgrid-scale model
No full textLarge-eddy simulation (LES) of turbulent channel flow are performed with a new subgrid-scale (SGS) stress model. The simulations show that with this model we can well predict turbulent wall flows at coarse resolutions and moderately high Reynolds numbers. The commonly used dynamic Smagorinsky model fails at coarser resolutions
Explicit algebraic and differential Reynolds stress model application to homogeneously sheared and compressed turbulence
No full textAn explicit algebraic and differential Reynolds stress models (EARSM and DRSM) are used to investigate the influence of homogeneous shear and compression on the behaviour of turbulence in the limit of rapid distortion theory (RDT). EARSM is shown to give realizable results and to preserve RDT regime, unlike the eddy-viscosity model (EVM). The DRSM version of our model is in reasonable agreement with RDT theory
Generalissimo A.V. Suvorov: General’s Persona in Memory Politics of Early 20th Century Russian Empire
No full textThis article addresses the utilization of heroic imagery from the past within the memory politics of the early 20th century Russian Empire. The author provides a detailed analysis of the commemoration of A.V. Suvorov’s feats during the reign of Nicholas II. It is demonstrated that the centenary of Suvorov’s death catalyzed a resurgence of interest in this heroic figure. Based on archival documents and periodical press, the study shows that efforts to immortalize the general continued after the centennial anniversary. The research establishes that Victorian themes occupied a central position in the symbolic politics of autocratic power throughout this period. The author concludes that the state actively employed the heroic image of A.V. Suvorov to legitimize the existing order and unify the empire’s populace. It is emphasized that, in the early 20th century, key instruments for shaping the memory landscape included the construction of a pantheon of national heroes, the establishment of museums, the organization of celebratory ceremonies, and the execution of educational initiatives, alongside monumental commemoration. The author asserts that narratives from military history were instrumental in creating cultural infrastructure both within and beyond the state’s borders. This article is of particular interest to researchers exploring issues related to historical memory and memory politics in the early 20th century
Numerical modelling of the Luna-Glob lander electric charging on the lunar surface with SPIS-DUST
No full textInternational audienceOne of the complicating factors of the future robotic and human lunar landing missions is the influence of the dust. The upper insulating regolith layer is electrically charged by the solar ultraviolet radiation and the flow of solar wind particles. Resulted electric charge and thus surface potential depend on the lunar local time, latitude and the electrical properties of the regolith.Understanding of mechanisms of the dust electric charging, dust levitation and electric charging of a lander on the lunar surface is essential for interpretation of measurements of the instruments of the Luna-Glob lander payload, e.g. the Dust Impact sensor and the Langmuir Probe.One of the tools, which allows simulating the electric charging of the regolith and lander and also the transport and deposition of the dust particles on the lander surface, is the recently developed Spacecraft Plasma Interaction Software toolkit, called the SPIS-DUST.This paper describes the SPIS-DUST numerical simulation of the interaction between the solar wind plasma, ultraviolet radiation, regolith and a lander and presents as result qualitative and quantitative data of charging the surfaces, plasma sheath and its influence on spacecraft sensors, dust dynamics. The model takes into account the geometry of the Luna-Glob lander, the electric properties of materials used on the lander surface, as well as Luna-Glob landing place. Initial conditions are chosen using current theoretical models of formation of dusty plasma exosphere and levitating charged dust particles.Simulation for the three cases (local lunar noon, evening and sunset) showed us the surrounding plasma sheath around the spacecraft which gives a significant potential bias in the spacecraft vicinity. This bias influences on the spacecraft sensors but with SPIS software we can estimate the potential of uninfluenced plasma with the data from the plasma sensors (Langmuir probes). SPIS-DUST modification allows us to get the dust dynamics properties. For our three cases we've obtained the dust densities around the spacecraft and near the surface of the Moon. As another practical result of this work we can count a suggestion of improving of dusty plasma instrument for the next mission: it must be valuable to relocate the plasma sensors to a distant boom at some distance from the spacecraft
Lutein and zeaxanthin complex: ophthalmologists’ choice
No full text
A.V. Korneeva
LLC “Three-Z-Moscow”, Moscow, Russian Federation
This article summarizes the data on carotenoids and their role in retinal antioxidant protection. The relevance of lutein and zeaxanthin complexes and criteria for their choice are discussed. Data on the relationship between low carotenoid levels in the fovea and age-related macular degeneration (AMD) are available. There are several lutein and zeaxanthin complexes which formulations were developed according to the AREDS2. Clinical trials demonstrate that lutein and zeaxanthin complexes improve both retinal functional activity and morphological parameters and are effective to prevent AMD development and progression. They are recommended for unbalanced diet, gastrointestinal disorders, psychoemotional stresses (e.g., drivers or professional athletes), intensive ultraviolet (e.g., welders, lighters or mountain tourists), myopia, accommodation cramp, inflammatory and degenerative ocular disorders. Optimal dosing is 1 tablet per day for at least 3 months twice a year.
Key words: lutein, zeaxanthin, carotenoids, antioxidants, age-related macular degeneration.
For citation: Korneeva A.V. Lutein and zeaxanthin complex: ophthalmologists’ choice. Russian Journal of Clinical Ophthalmology. 2019;19(1):54–58.
About the author:
Alina V. Korneeva — MD, PhD, ophthalmologist.
“Three-Z-Moscow”. 3, Boris Galushkin Str., Moscow, 129301, Russian Federation.
Contact information: Alina V. Korneeva, e-mail: [email protected]. Financial Disclosure: author has no a financial or property interest in any material or method mentioned. There is no conflict of interests. Received 17.10.2018.<br
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