1,807 research outputs found
Search for low-energy Borexino's signals correlated with gamma-ray bursts, solar flares and gravitational wave events.
No full textA.V. Derbin for the Borexino collaboration The results of a low-energy neutrino search using the Borexino detector in coincidence with gamma-ray bursts (GRB), solar flares (SF) and gravitational wave (GW) events are presented. The correlated events with energies greater than 0.25 (1.0) MeV were looked for within a various time windows centered around the GRB, SF or GW detection time. As a result, we have obtained the best current upper limits on all flavor neutrino fluences associated with these astrophysical sources for neutrino energy below 5-7 MeV
Measurement of - beta-spectra with Si(Li) detectors for the purpose of determining the spectra of electron antineutrinos.
No full textS.V. Bakhlanov, A.V. Derbin, I.S. Drachnev, V.N. Muratova, N.V. Pilipenko, D.A. Semenov, E.V. Unzhakov
St. Petersburg Nuclear Physics Institute National Research Center “Kurchatov Institute”, Gatchina, Russia
The specifications of a newly developed beta-spectrometer, based on full absorption Si(Li) detector and thin transmission detector, are shown. The spectrometer allows to separate effectively beta-radiation and accompanying X-rays and gamma radiation using registration of coincident events from both detectors. The spectrometer can be used for precision measurements of various beta-spectra, namely for the beta-spectrum shape study of 144Pr
^{144}\rm{Pr}
, which is considered to be an advantageous anti-neutrino source for sterile neutrino searches. The preliminary results for beta spectra from 144Ce−144Pr
^{144}\rm{Ce}-^{144}\rm{Pr}
decays and reconstructed antineutrino spectra are presented
Search for resonant absorption of solar axions by nuclei
No full textA.V. Derbin, I.S. Drachnev, Yu.M. Gavrilyuk, A.M. Gangapshev, V.V. Kazalov,V.V.Kuzminov,V.N. Muratova, S.I. Panasenko, S.S. Ratkevich, D.A. Tekueva, E.V.Unzhakov, S.P. Yakimenko
A search for resonant absorption of the solar axions with a wide continuous spectra by nuclei is continued with the krypton proportional counter at the Baksan Neutrino Observatory. Such an absorption should lead to the excitation of low-lying nuclear energy level of . The results obtained after 613 days of measurements allow to constraint on the axion–photon coupling and axion mass for Primakoff solar axions. This bound corresponds to the upper limit on KSVZ axion mass eV. For solar axions produced by Compton and bremsstrahlung like processes the limit on axion-electron coupling and KSVZ axion mass are ~eV and eV, correspondingly (all at 95\% C.L.)
Search for resonant absorption of solar axions by nuclei
No full textA.V. Derbin, I.S. Drachnev, Yu.M. Gavrilyuk, A.M. Gangapshev, V.V. Kazalov,V.V.Kuzminov,V.N. Muratova, S.I. Panasenko, S.S. Ratkevich, D.A. Tekueva, E.V.Unzhakov, S.P. Yakimenko
A search for resonant absorption of the solar axions with a wide continuous spectra by nuclei is continued with the krypton proportional counter at the Baksan Neutrino Observatory. Such an absorption should lead to the excitation of low-lying nuclear energy level of . The results obtained after 613 days of measurements allow to constraint on the axion–photon coupling and axion mass for Primakoff solar axions. This bound corresponds to the upper limit on KSVZ axion mass eV. For solar axions produced by Compton and bremsstrahlung like processes the limit on axion-electron coupling and KSVZ axion mass are ~eV and eV, correspondingly (all at 95\% C.L.)
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
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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