Study of natural convection development in narrow vertical channels

The process of heat transfer due to natural convection in narrow vertical water-filled pipes is considered. Experimental and simulation data are given. The mechanism of natural convection development is analysed. © Published under licence by IOP Publishing Ltd

Modeling of Condensation Reaction of Aniline to Diphenylamine by PM7 Method

Modeling of the condensation reaction to diphenylamine was carried out by PM7 method with acid catalysts: tetrafluoroborate, oxytrifluoroborate and anilinium oxytetratrifluoroborate. The calculated data prove that the formation of a few protonated forms of aniline is possible during the reaction of aniline with acids. Only positively charged p- and o-[sigma]-complexes are capable of further interaction with aniline. The stage of intramolecular proton transfer from the primary to the secondary amino groups of intermediates of aniline reaction with proton aniline ?-complex determines the condensation rate of aniline to diphenylamine with acid catalysts. A catalyst anion can form ionic and ion-dipole complexes with reaction mixture components and can influence the distribution of electron density in reactants and their reactivity with its field

Influence of intestinal coccidiosis on weight gain of young cattle

The purpose of the research is to study the effect of coccidiosis infection (cryptosporidiosis, eimeriosis) on the average daily gains in live weight of young cattle.Materials and methods. The studies were carried out on animals spontaneously infected with Eimeria spp. And Cryptosporidium spp. According to the principle of analogues, 4 groups of animals were formed, 10 heads each. In the first experiment, the average daily weight gain of 1-20-day-old animals infected with Cryptosporidium (1st experimental group) and clinically healthy calves (1st control group) was compared. For the second experiment, calves at the age of 2-4 months, infected with Eimeria spp. (2nd), were selected, young animals free from infection were selected in the second control group.Results and discussion. In calves infected with Cryptosporidium spp., the average daily gains ranged from 0.597±0.017 to 0.675±0.018 kg. The decrease in growth per day relative to the animals of the control group was, on average, 0.346 kg. The maximum loss of weight gain, 11.0±0.88 kg, was recorded in November. A similar dynamic of the decrease in average daily weight gain was established in animals at eimeriosis. During the research period, the shortfall in live weight of calves infected with Eimeria spp. was 21.5±2.6 kg, which is 12.3 kg less relative to the mass of calves infected with Cryptosporidium spp. Sharp fluctuations in the reduction of average daily weight gain in this group were not recorded: on average, 0.248±0.113 kg relative to the control group. Thus, the reason for the lack of live weight gain (up to 40 %) in calves in the farm of the Uvinsky district of the Udmurt Republic is intestinal coccidiosis. The minimum indicator of the average daily gain in live weight (0.597±0.017 kg) falls on the group of calves infected with cryptosporidiosis, which is almost 2 times less relative to the gain of animals from the control group

Ecological and Economic Advantages of Remote Heat Supply from Reactor Plant of Advanced Safety BN-1200

The heat supply based on the combined heat and power production is the basis of rational use of energy resources. This will increase the efficiency of existing nuclear power plants (NPP) and give a significant cut in the nitrogen oxide and greenhousegases emissions from burning fossil fuels. The data of the remote heat transport are summarized. The technical, economic, and ecological preconditions determining the long-distance transportation of heat possibility are given. The estimation of the efficiency of long-distance transport of heat from NPP is made. A variant of a scheme of Ekaterinburg heat supply from Beloyarsk NPP is given. Keywords: nuclear power plant, efficiency, the heat supply based on the combined heat and power production, waste heat, heat pump, radiation safet

Consulting in the field of information technologies

This article describes the possibilities of IT consulting and its role in modern society. The causes of low efficiency of the use of information technology in the enterprise. The article also describes the steps IT consulting, what benefits the company receives from the use of IT consultingВ данной статье описываются возможности ИТ - консалтинга, его роль в современном обществе. Рассматриваются причины невысокой эффективности применения информационных технологий на предприятии. Также в статье описываются этапы ИТ - консалтинга, какие преимущества получает предприятие вследствие применения ИТ - консалтинг

Evolution of microstructure and mechanical properties of Tibased metal-matrix composites during high-pressure torsion

The microstructure and microhardness evolution of a Ti/TiB and Ti15(wt.%) Mo/TiB metal-matrix composites (MMC) during high-pressure torsion (HPT) at 400 °C was studie

MODEL FOR ASSESSING DIGITAL LEADERSHIP OF ORGANIZATION

A mathematical model of the level of development of digital leadership in leading scientific and technological sectors has been proposed. The assessment is proposed to be carried out in five main areas, each of which includes both quantitative (for example, the share of modern (digital) training areas in the total number) and qualitative criteria (for example, the speed and effectiveness of interaction between the organization’s departments).Using the lower level of the hierarchy, the criteria of one direction are compared in pairs by the strength of their influence on the key direction as a whole. As a result, a matrix of pairwise comparisons is created. The level of development of digital leadership is characterized by an aggregated indicator calculated on the basis of the normalized matrix vector. The assessment methodology can be used both by organizations in the scientific and technical sectors (universities, institutes, research centers, etc.), and by government bodies responsible for the implementation of activities related to digitalization

Scanning Electron Microscopy Study of Drilling Cuttings in Tomsk Oblast Sites

The research is focused on determining mineralogical composition of drilling cuttings by scanning electron microscope as well as imaging the sample surface of high resolution that allows studying the structural characteristics of the site. In addition, a number of other techniques permit obtaining information on chemical composition of sample in near-surface layers. The study in drilling cuttings by means of scanning microscopy has revealed the presence of titanium, iron, zirconium oxides, iron sulphide, barium sulphate. The former is a mineral that concentrates rare-earth elements, presumably monocyte, as well as uranium silicate, etc. The results obtained confirm the data of previous X-ray structural analysis, i.e. the study samples consist of alumosilicate matrix. Apart from silicon and aluminium oxides, the matrix includes such elements as Na, K, Mg. Such a composition corresponds to rock-forming minerals: quartz, albite, microcline, clinochlore, muscovite, anorthoclase

Verification of mathematical models of flow around a spherical element by the PIV-method

При создании высокотемпературных газоохлаждаемых ядерных реакторов альтернативой засыпке из шаровых тепловыделяющих элементов является подвес шаровых элементов в каналах с специально организованным потоком газа. При этом отсутствуют термомеханические напряжения тепловыделяющих элементов, и значительно интенсифицируется теплообмен. Целью данного исследования является экспериментальная верификация математической модели обтекания шарового тепловыделяющего элемента с помощью метода цифровой трассерной визуализации (PIV-метод). Экспериментально получено поле скорости при обтекании шарового элемента, которое позволило установить достоверность разработанной ранее математической модели.When a high-temperature gas-cooled nuclear reactors are creating, alternative of spherical fuel elements backfilling is a suspension of spherical elements in channels with specially organized gas flow. Then there are no thermomechanical stresses of the fuel elements, and the heat exchange intensifies greatly. The purpose of this study is experimental verification of mathematical models of flow around a spherical fuel element by the method of particle image velocimetry (PIV-method). The velocity field obtained experimentally in the flow around of spherical element, which allowed to establish the accuracy of the previously developed mathematical model

Transformation of the Personnel Policy of Russian Universities Participating in Project 5-100: The Case of National Research Nuclear University Mephi

The article examines the development of personnel policy and human resource management (HRM) in Russian universities under the influence of the Project 5-100. Globalization has intensified the processes of universities corporatization and the spread of effective management practices. National academic excellence programs have contributed to strengthening the performance-based governance in universities all over the world. These factors had deeply influenced the transformation of HRM practices at universities. Russian studies in this field are shown as fragmented, focusing on narrow aspects, and not forming a holistic picture of the HRM system transformation in Russian universities. This work aims to describe a holistic case of personnel policy and HRM system development in one of the leading Russian universities – the National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute).The research applied the method of semi-formalized interviews and covered 25 employees of MEPhI. Four interview guides were developed for different categories of employees (top management, middle management, academics, teachers), including more than 25 questions, focusing on employees’ perception of different components of the HRM system at the university. The study showed that the HRM system at MEPhI was significantly transformed under the influence of the Project 5-100: the personnel policy was formalized in high-level strategic documents; the processes of recruitment and selection of foreign employees have been rebuilt; the considerable increase in the number of foreign employees was reached; global partners began to play an important role; a comfortable environment for the implementation of initiatives was created and opportunities for professional development were provided. A significant part of these changes is connected, directly or indirectly, with the university’s participation in the Project 5-100. In general, this points to its positive impact on personnel policy and the HRM system at the university. The results obtained can be used as a basis for formulating recommendations for improving the personnel policy and HRM system in Russian universities as an important component of the management system as a whole