Rationing and vibration monitoring of knife refiners

The subject of the research is rationing and monitoring of the vibration of knife refiners. GOST 26493-85, specifying the permissible values of the vibration amplitude of the mills, is outdated. This standard does not take into account new designs of knife refiners and the requirements of national and international standards. It is proposed to establish two criteria for assessing the vibration state of the refiners. The first criterion normalizes the amplitude of vibration in octave strips of frequencies, while the second criterion specifies the vibration trend on the general level. It is proposed to use the vibration velocity as the measured parameter. The necessity of separating the refiners into two groups was revealed: with a disc or cone diameter up to 1000 mm and with a diameter over 1000 mm. The boundaries of zones and vibration trends are determined: good; satisfactorily; need improvement and unacceptable. After that, a decision is made to limit the functioning of these machines (prevention and stop). The introduction of standards and vibration monitoring will accelerate the transition to repairs of machines on the technical condition. Methods of rationing and monitoring can be used in other industries, for example, in the mining and metallurgical industries. © Published under licence by IOP Publishing Ltd

Microscopic examination of hot spots giving rise to nonlinearity in superconducting resonators

We investigate the microscopic origins of nonlinear rf response in superconducting electromagnetic resonators. Strong nonlinearity appearing in the transmission spectra at high input powers manifests itself through the emergence of jumplike features near the resonant frequency that evolve toward lower quality factor with higher insertion loss as the rf input power is increased. We directly relate these characteristics to the dynamics of localized normal regions (hot spots) caused by microscopic features in the superconducting material making up the resonator. A clear observation of hot-spot formation inside a Nb thin film self-resonant structure is presented by employing the microwave laser scanning microscope, and a direct link between microscopic and macroscopic manifestations of nonlinearity is established.Comment: 5 pages, 4 figure

Observation of Stochastic Resonance in Percolative Josephson Media

Measurements of the electrical response of granular Sn-Ge thin films below the superconducting transition temperature are reported. The addition of an external noise to the magnetic field applied to the sample is found to increase the sample voltage response to a small externally applied ac signal. The gain coefficient for this signal and the signal-to-noise ratio display clear maxima at particular noise levels. We interpret these observations as a stochastic resonance in the percolative Josephson media which occurs close to the percolation threshold.Comment: 4 pages, 5 figure

Analysis of regression relationship between the number of organisations of the Russian Regional innovation infrastructure and the university Infrastructure and the gross regional product

We took databases of the National Information and Analytical Center for monitoring innovation infrastructure of scientific and technological activities and regional innovation systems and the Web portal of innovation and business information support “Innovations and entrepreneurship”, Webometrics database according to rankings of all Russian universities, as well as the database of the Russian Federal State Statistics Service on the gross regional product for all regions of Russia as an empirical basis in order to determine the regression relationship between the number of organisations of the regional innovation and university infrastructure and the gross regional produc

Совершенствование транспортного обслуживания в городе Брянске

The object of the study of the article is the passenger transport network of the city of Bryansk. The task of improving transport services for the population is solved in the context of modernising vehicle fleet, transport infrastructure and in-depth implementation of digital technologies. The analytical method allowed to assess the state of the transport system of the city of Bryansk. The assessment touched upon several interrelated areas that provide a high quality of transport services. The data were obtained by studying open Internet resources, including the website of the administration of the city of Bryansk, and through field observations.Work on updating the fleet of route vehicles is carried out within the framework of the «Concept for development of public transport in the city of Bryansk for the period 2015–2025», which over the past four years has led to a significant renewal of the bus fleet of medium and large capacity and to the decrease in the share of buses of small capacity. The road network has also been significantly upgraded.The routes of urban passenger transport have been analysed from the point of view of the degree of duplication. Guidelines for improving the routes of the transport network are proposed.Объектом исследования статьи является пассажирская транспортная сеть города Брянска. Совершенствование транспортного обслуживания населения решается в разрезе модернизации средств транспорта, транспортной инфраструктуры и углубленного внедрения цифровых технологий. На основе аналитического метода проведена оценка состояния транспортного комплекса города Брянска, включающая в себя несколько взаимосвязанных направлений, обеспечивающих высокое качество транспортного обслуживания. Данные получены путём исследования открытых интернет-ресурсов, в том числе интернет-сайта администрации г. Брянска, натурных наблюдений.Работы по обновлению парка маршрутных транспортных средств производятся в рамках «Концепции развития транспорта общего пользования города Брянска на период 2015–2025 годы», что привело за последние четыре года к существенному обновлению автобусного парка средней и большой вместимости и снижению доли автобусов малой вместимости. Также существенно модернизирована дорожная сеть.Проанализированы с точки зрения степени дублирования маршруты городского пассажирского транспорта. Предложены направления совершенствования маршрутов транспортной сети

Electrical breakdown of a dielectric for the formation of a superconducting nanocontact

Electrical breakdown of the dielectric nanolayer between film electrodes of niobium and an alloy of 50% indium and 50% tin forms a bridge of this alloy between the electrodes. The bridge resistance depends on the breakdown current. The length of the bridge is equal to the thickness of the dielectric (30 nm), and its diameter is 25 nm. The calculated coherence length of the alloy at 0 K is close to the length of the bridge. The calculated critical current of a bridge with a resistance of 1 {\Omega} at a temperature of 0 K is 2 mA. It is concluded that such a bridge should have the properties of a Josephson contact at a temperature lower than the critical temperature of the alloy (6.5 K).Comment: 11 pages, 7 figure