Measurement of the η\eta -η′\eta' mixing angle in π−\pi^{-} and K−K^{-} beams with GAMS-4π4\pi Setup

The results of mixing angle measurement for $\eta'$, $\eta$ mesons generated in charge exchange reactions with $\pi^{-}$ and $K^{-}$ beams are preseneted. When the $\eta'$, $\eta$ mesons are described in nonstrange(NS)--strange(S) quark basis the $\pi^{-}$ and $K^{-}$ beams allow to study $|\eta_{q}>$ and $|\eta_{s}>$ parts of the meson wave function. The cross section ratio at $t'=0$ (GeV/c)$^{2}$ in the $\pi^{-}$ beam is $R_{\pi}(\eta'/\eta)= 0.56 \pm 0.04$, results in mixing angle $\phi_{P} = (36.8 \pm 1.)^{o}$. For $K^{-}$ beam the ratio is $R_{K}(\eta'/\eta)= 1.30 \pm 0.16$. It was found that gluonium content in $\eta'$ is $\sin^{2}\psi_{G}= 0.15 \pm 0.06$. The experiment was carried out with GAMS-4$\pi$ Setup.Comment: 6 pages, 4 figures, 1 table, to be submitted in European physical journal C. Minor changes, the Bibliography extende

Development of university sports in Russia: Management and economics

The article is devoted to topical issues of the development of student sports in Russia, bearing in mind the issues of management of student sports and their financing. The experience of the development of student sports clubs of universities is summarized and possible prospects for the development of the economy of student sports are presented

Molecular gyroscopes and biological effects of weak ELF magnetic fields

Extremely-low-frequency magnetic fields are known to affect biological systems. In many cases, biological effects display `windows' in biologically effective parameters of the magnetic fields: most dramatic is the fact that relatively intense magnetic fields sometimes do not cause appreciable effect, while smaller fields of the order of 10--100 $\mu$T do. Linear resonant physical processes do not explain frequency windows in this case. Amplitude window phenomena suggest a nonlinear physical mechanism. Such a nonlinear mechanism has been proposed recently to explain those `windows'. It considers quantum-interference effects on protein-bound substrate ions. Magnetic fields cause an interference of ion quantum states and change the probability of ion-protein dissociation. This ion-interference mechanism predicts specific magnetic-field frequency and amplitude windows within which biological effects occur. It agrees with a lot of experiments. However, according to the mechanism, the lifetime $\Gamma^{-1}$ of ion quantum states within a protein cavity should be of unrealistic value, more than 0.01 s for frequency band 10--100 Hz. In this paper, a biophysical mechanism has been proposed that (i) retains the attractive features of the ion interference mechanism and (ii) uses the principles of gyroscopic motion and removes the necessity to postulate large lifetimes. The mechanism considers dynamics of the density matrix of the molecular groups, which are attached to the walls of protein cavities by two covalent bonds, i.e., molecular gyroscopes. Numerical computations have shown almost free rotations of the molecular gyros. The relaxation time due to van der Waals forces was about 0.01 s for the cavity size of 28 angstr\"{o}ms.Comment: 10 pages, 7 figure

ПРЕДПРИНИМАТЕЛЬСТВО В ИНДУСТРИИ СПОРТА: НАПРАВЛЕНИЯ, ИННОВАЦИИ И ФОРМЫ ПОДДЕРЖКИ

Within the framework of this article, the authors analyze the following areas of entrepreneurial activity in sports industry: sports and health services, including fitness clubs, sports clubs, schools and academies; managing the competitions (leagues); corporate sports; media resources; bookmakers, e-sports. As part of the work, positive examples of entrepreneurship in sports industry were noted, as well as the role, interests and tasks of the state. The directions of innovative development within each of the identified blocks are considered separately. The authors also systematized support measures for development entrepreneurship (small and medium enterprises – SME) and identified its features for the sports industry. Following directions for further research are proposed: analysis of individual markets for entrepreneurship in the sports industry; development and testing of methods for assessing the effectiveness of support measures for SME in sports industry; development of professional training of entrepreneurs for the sports industry.В рамках настоящей статьи авторы проанализировали следующие направления предпринимательской деятельности в индустрии спорта: спортивно-оздоровительные услуги, в том числе фитнес-клубы, спортивные клубы, школы и академии; организация соревнований (лиг); корпоративный спорт; медиаресурсы; букмекерские конторы, киберспорт. В рамках работы отмечены положительные примеры предпринимательства в индустрии спорта, а также роль, интересы и задачи государства. Отдельно рассмотрены направления инновационного развития в рамках каждого из выделенных блоков. Также авторы систематизировали меры поддержки предпринимательства и выявили его особенности для индустрии спорта. В качестве направлений дальнейших исследований в данной сфере предложены: анализ отдельных рынков предпринимательства в индустрии спорта; разработка и апробация методик оценки эффективности мер поддержки предпринимательства в индустрии спорта; развитие профессиональной подготовки предпринимателей для индустрии спорта

Changes in the agrochemical parameters of sod-podzolic soils under the influence of chromium pollution and recultivation measures

In the conditions of the Udmurt Republic, field experiments (2017-2021) were carried out on the remediation of  agro-podzolic loamy soil (albeluvisoils) with a high level of chromium contamination (application of 500 mg a.i./kg of soil). Both chemical and physicochemical mechanisms have been used to reduce the degree of mobility of this heavy metal in soil. Ameliorants and fertilizers (limestone and phosphate rock, superphosphate, potassium humate, peat, zeolite) in various doses were studied as ameliorative additives. Various doses of ameliorants and fertilizers were studied as ameliorative additives: limestone and phospharite meal, superphosphate, potassium humate, peat and zeolite. As a result of the research, it was found that all ameliorative additives not only caused a sharp decrease in the mobility of chromium by 40-65 %, but also had a positive effect on the agrochemical parameters of the contaminated soil. The nature and parameters of this influence were determined by their chemical composition, the rate of application, and the period that passed after the application. Limestone flour statistically significantly reduced soil acidity in contaminated soil (by 1.21-3.03 pHKCl units) and increased the total of absorbed bases by 1.7-6.5 times. Phospharite meal (by 2.1-9.1 times) and superphosphate (by 13-43 %) increased the mobile phosphorus content in the soil; peat increased the organic matter content (by 0.28-1.47 abs.%); zeolite increased the total exchangeable bases by 1.4-9.8 mmol/100g or by 12-239 %. The positive effect of these ameliorative additives, especially their increased doses, was traced during all five years of observation, what allows them to be recommended as promising ameliorants for restoring the fertility of soddy-podzolic soils contaminated with chromium

ENTREPRENEURSHIP IN SPORTS INDUSTRY: DIRECTIONS, INNOVATIONS AND SUPPORT

Within the framework of this article, the authors analyze the following areas of entrepreneurial activity in sports industry: sports and health services, including fitness clubs, sports clubs, schools and academies; managing the competitions (leagues); corporate sports; media resources; bookmakers, e-sports. As part of the work, positive examples of entrepreneurship in sports industry were noted, as well as the role, interests and tasks of the state. The directions of innovative development within each of the identified blocks are considered separately. The authors also systematized support measures for development entrepreneurship (small and medium enterprises – SME) and identified its features for the sports industry. Following directions for further research are proposed: analysis of individual markets for entrepreneurship in the sports industry; development and testing of methods for assessing the effectiveness of support measures for SME in sports industry; development of professional training of entrepreneurs for the sports industry

Active Control of Polariton-Enabled Long-Range Energy Transfer

Optical control is achieved on the excited state energy transfer between spatially separated donor and acceptor molecules, both coupled to the same optical mode of a cavity. The energy transfer occurs through the formed hybrid polaritons and can be switched on and off by means of ultraviolet and visible light. The control mechanism relies on a photochromic component used as donor, whose absorption and emission properties can be varied reversibly through light irradiation, whereas in-cavity hybridization with acceptors through polariton states enables a 6-fold enhancement of acceptor/donor contribution to the emission intensity with respect to a reference multilayer. These results pave the way for synthesizing effective gating systems for the transport of energy by light, relevant for light-harvesting and light-emitting devices, and for photovoltaic cells.Comment: 52 pages, 40 Figures, 202