1,763 research outputs found
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
Preionization and gain studies in fluorine based excimer laser gas discharges
No full textFluorine-based excimer gas lasers are powerful sources of coherent radiation in the UV and VUV part of the electro-magnetic spectrum. Due to their short wavelengths and high output power they are widely employed in high resolution material processing like micromachining and in lithography. In this field pattern sizes several times shorter than the used wavelength can be achieved using an immersion technique. However due to the short duration of the laser pulse (typically of few tens of ns for commercially available fluorine-based excimer lasers), the laser pulse makes only a few round-trips inside the laser resonator cavity. As the result, the optical quality of the laser beam of such an excimer laser is poor, leading to non optimal focusing conditions. The purpose of this work was to investigate different methods and techniques to produce excimer lasers, based on fluorine containing gas mixtures, emitting optical pulse lengths of 100 ns or longer. In order to achieve this goal we have studied different gas discharge excitation techniques in a small scale discharge chamber (0.5 – 4 cm discharge gap, 5 cm electrodes diameter) at gas pressures varying from 2 to 5 bar. We have thoroughly investigated a pre - main pulse gas discharge pumping scheme with X-ray preionization and a single pulse excitation scheme with X-ray preionization. As preionization source we investigated two homemade X-ray sources. We have developed a high voltage open barrier discharge device producing a fast electron beam directly in the gas. It was shown that it was possible to generate soft X-ray radiation (10 – 100 keV) directly in gases by means of this beam. With this and with an earlier developed traditional X-ray source the produced electron densities in different gases and gas mixtures have been measured. During our experiments we discovered that, apart from the well known direct electron generation in the gas, a substantial part of the measured preionization electrons were generated indirectly by the Xrays via the photo-electric effect at the electrode. With the single pulse excitation scheme we succesfully ignited a homogeneous discharge and were able to sustain it as a stable, homogeneous pulsed gas discharge in gas mixtures typically containing 5 % of Ar and 0.1 % of F2 at a total gas pressure of 2 bar and an electrode distance of 1 cm. In this laser gas mixture the typical achieved peak power deposition density was 1 – 2 MW cm-3 with a pulse duration (FWHM) of ~ 100 ns. Under these conditions the observed spontaneous emission intensity was 119 kW cm-3 at the ArF* excimer wavelenth (193 nm). The width of this emission signal was ~ 60 ns (FWHM). With a probe laser (λ = 193 nm) the amplification of the probe signal in the excited laser medium was measured. Under the same conditions a net gain was measured of ~ 34±20 % cm-1 with a FWHM of ~ 60 ns. The combination of such high gain and the reasonably long optical pulse duration makes our gas discharge excitation system a promising device for the development of small scale fluorine-based excimer gas lasers. The short resonator length of several cm will result in a higher number of the intra cavity round-trips and thus to a better beam quality compared to the usual excimer lasers
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
Improving the Computational Model for Approximation of Particle Functions over Diameter of Dust in the Work Area and at the Border of the Sanitary Protection Zone
No full textAbstractThis paper describes the basic ways of solving the problem of experimental data approximation. Disperse composition of crushed gypsum dust was analyzed; the analysis results are presented herein. Approximating function of particulate dust composition function is a piecewise function, defined as a three-tier spline “direct-parabola-hyperbole.” The approximation aims at finding seven function factors and two nodal points. The least square method was used to estimate the unknown parameters of regression models for the sample data. To apply this method to experimental data, a program complex calculation models for the approximation of the integral representation of the mass distribution function of particles in the dust diameter in CAS Maple was presented. It defines a function that describes the distribution of the particulate composition of the dust released from the open warehouse storage of crushed gypsum rock with the smallest error
Environmental and Working Area Dust Emission from the Gypsum Warehouse
No full textAbstractThe work analyses the emissions analysis for gypsum binder production. The major air pollutant is the suspended solids composed of a mixture of particles in air, which can be either solid or liquid and be a complex mixture of organic and inorganic substances. Studies have shown that excessive concentrations of inorganic dust (gypsum dust) generated by the open gypsum warehouse storage and thus the contribution of emission sources into total concentration of inorganic dust (dust plaster) average vary from 66,28% to 87,67%. The highest excessive concentrations of inorganic dust are registered at the border of regulated areas: up to 20% SiO2 (plaster dust) (from 5,9 to 16,0 shares of maximum allowable concentration (MAC))
Author Correction:A 41,500 year-old decorated ivory pendant from Stajnia Cave (Poland)
No full textCorrection to: Scientific Reports https://doi.org/10.1038/s41598-021-01221-6, published online 25 November 2021The original version of this Article contained errors in the author list where Marjolein D. Bosch was omitted from the author list, and Mikołaj Urbanowski was incorrectly listed as an author of the original Article, and has subsequently been removed.The Author contributions section now reads:“S.T. W.N. and A.N. conceived the project; S.T., W.N., A.P., M.B., S.C., M.D., H.F., A.M., M.D. B., D.P., M.P.R., C.M.R., V.S-M., G.M.S., P.S., M.S., K.S., A.V., F.W., H.W., A.W., M.Z., S.B., A.N., J-J. H., performed research; S.T., A.P., W.N., M.B., M.D.B., S.C., M.D., H.F., A.M., D.P., M.P.R., C.M.R., V.S-M., G.M.S., P.S., M.S., K.S., A.V., F.W., H.W., A.W., M.Z., S.B., A.N., J-J. H. analysed all archaeological data; S.T. and A.P. wrote the paper with the collaboration of all the co-authors.”The original Article and its accompanying Supplementary Information file have been corrected
- …
