№ 131(7), September, 2017
Public date: 29.09.2017
Archive of journal: Articles count 124, 307 kb
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OBTAINING OF FREQUENCY CHARACTERISTICS FOR INDUCTION MOTORS USING THE RESULTS OF THE EXPERIMENT
DescriptionThe article is devoted to the solution of the urgent task, which is to increase the reliability of the power supply systems of enterprises for processing agricultural products. The material of the article has a research character, which consists in the fact that the obtained expressions for the frequency characteristics of high-voltage induction motors allow us to investigate the symmetric modes of their operation by means of a more efficient and simple apparatus. A number of provisions of the article have a scientific novelty, which consists in obtaining frequency characteristics for induction motors as a result of the experiment. A convenient procedure for obtaining the frequency response of an induction motor based on the results of an experiment using the mathematical model of an induction motor in the coordinates of the generalized vector and the Fourier transform has been developed. As an example, oscillograms of the stator current of an induction motor of the A-12-52-4 type are given for the initial stage of the start-up. For the stator current of this induction motor, a transition is made from the phase coordinate system to the coordinates of the generalized vector. The dependences of the stator current on the D and Q axes on time are constructed. The real and imaginary parts of the frequency characteristic of the engine are calculated for sliding s = 1, the calculations are illustrated by the corresponding graphical characteristics. The results of the study are proposed to be used for the calculation of transients in power supply systems for enterprises engaged in the processing of agricultural products
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Description
The article formulates and solves the task of discrete control in the thermophilic stage of the composting process. It is shown that considering the relay control entity to maintain specified process conditions requires the organization of the sliding mode. We have solved the problem of minimizing the temperature deviation of the substrate from the set values and the deviation of the oxygen concentration in the gas phase of the bioreactor from the specified values. The article shows the algorithm to compute the discrete control of the composting process in the thermophilic stage. This work was prepared in the framework of the scientific project 16-48-230441 a(R) "Mathematical modeling of the processes occurring in the automated installation for year-round production of organic fertilizers in the conditions of the Krasnodar region", financed by RFBR and the administration of the Krasnodar region
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Description
The article presents the results of studies of changes in the atomic radii of isotopes of the elements of the periodic table. With using the mass-radial model of calculations, the values of atomic radii for isotopes of chemical elements were obtained. It is shown that the atomic radius of different isotopes of one element is different and depends on the mass and radius of the nucleus. To study the changes in ∆Rav values in the groups and periods of the Periodic Table of Chemical Elements, the ∆Rav dependences on the period number and group number are constructed. It is found that the values depending on the number ∆Rav period / group for the d-elements lie in the low ∆Rav values for selements - in high ∆Rav values, and p-elements - in average values ∆Rav. It is shown that when the atomic nucleus is increased by 1 neutron, the atomic radius increases from 0.01 to 4.76 pm, which is due to the physical effect inside the atom
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PRINCIPLE OF BINARISM IN DEVELOPING PHILOSOPHICAL CONCEPTIONS AND SCIENTIFIC THEORIES
DescriptionThe aim of the article is to demonstrate binarism as a method of theoretical perception. First of all, the authors define the initial concept of binarism as a principle of differentiating binary oppositions which came from philology into other sciences. Then, they stipulate the application conditions of binarism as a methodological principle, namely, both members of the opposition are stipulated, however, reasoning should not contain such logical mistakes as ‘defining through negation’ and ‘range of evidence’. Subsequently, logic of description is connected with stipulation of the ‘life’ concept, first, philosophically, then, using propositions of some natural sciences, namely, biological and, further on, physical and astrophysical definitions. Every time the authors use binary principle in describing these propositions. So, every time it becomes evident that if death can be defined as absence of life, the concept of life requires another approach, based on positive statements, which is also hard to do as it leads the researchers to the limit ‘nothing’ – ‘everything’; ‘not being’ – ‘being’. The results of the article have double nature. As the aim of the investigation was to demonstrate application features of the definite methodological principle, representation of the material may be considered as the aim achievement. In addition, in the concluding part the authors draw a line, formulating theoretical propositions, which concern both natural science and philosophical argumentation
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Description
One of the main components of quality of training of modern qualified personnel is the high level of teaching in universities. The article analyzes the problems of teaching information technology, preventing the formation of the high level of information competence in graduates of agricultural universities. This study examines the causes of problematic situations in teaching the subject: a low level of training of students on informatics and weak motivation of first-year students to study it; organizational and substantive errors of school and university education; low motivation of teachers to improve their professional level, to the publication of educational literature and creation of electronic materials; under-funding of personnel and hardware and software support of educational process; increasing the training of classroom teachers and number of subjects. The author proposes some approaches of a general nature to the solution of the problems under consideration: redistribution of the training course on the stages; main requirements of the school and University curriculum; raising the prestige of obtaining agricultural education and the introduction of entrance examinations for applicants; the introduction into the learning process of modern hardware and software technologies and new forms of education; reforming the system of professional development of teachers; the decline in classroom teachers; improving the system of material incentives for teachers to update the educational literature and the preparation of electronic materials; modernization of system of preparation of manuscripts for publication in the printing house; increase of salaries and introduction of allowances to teachers; improving the system of performance evaluation of teachers. Implementation of the proposed package of measures will lead, in the author's opinion, to increase the prestige of the teaching profession in society and the quality of teaching, thereby improve the degree of training of graduates of agricultural universities
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SOFTWARE IMPLEMENTATION OF THE V.V.LEONTIEF MODEL IN C#
DescriptionThe article considers a solution for an economy prognosis formation task in different industries and service sector. In addition, it contains a review of mechanism of an intersectoral balance and theoretical components of V.V. Leontief linear economic model of intersectoral balance. Premises of mathematiceconomical apparatus usage and practical usage in economy planning of many world countries and also results of this apparatus working making that countries’ economic condition “almost balanced” are studied. Inferences of “Input–Output” method significance in economy planning for company groups and country in general are made in this article too. Solution of program product for calculations and analysis development necessity is substantiated. In this program, output of reports is envisaged. Practical example of intersectoral balance task with the developed program is given in article and accuracy of calculations is approved. Program product structure and development tools are described. The program can be used as a tutorial for students studying on economical directions for economic indicators calculation experience gaining
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DESING MULTI-DETAILS GARMENTS USING TRADITIONAL MIDDLE EAST ORNAMENTS
DescriptionThe article presents the development of multi-detail women’s dress with rectilinear articulation that are located according to the principle of traditional middle East ornaments. As the source we have selected geometric ornaments called girih
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10.00.00 Philological sciences
DescriptionNowadays a foreign language study becomes more required; consequently, it is important to use various technologies for an effective result after finishing the studies. The project technique is a modern one and it has a number of principles, such as the activity principle, visual principle, communicative principle, availability and realization principles, the principle of regional specification and minimization. Their correct use facilitates the development of a foreign communicative competence of non-linguistic students
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PSEUDOEXFOLIATION SYNDROME AS A RISK FACTOR FOR CENTRAL RETINAL VEIN OCCLUSION
DescriptionThe retrospective study of patients with retinal vein occlusion and frequency of pseudoexfoliation syndrome is made in this study. Retinal vein occlusion is the second most common type of retinal vascular disorder, after diabetic retinal disease, and may develop with a consequent reduction in visual acuity. Pseudoexfoliation syndrome is an age-related disease characterized by the production and accumulation of a fibrillar extracellular material in several ocular tissues We have analyzed data of 73 patients with retinal vein occlusion. It was detected that risk of central vein occlusion is higher in patients with pseudoexfoliation syndrome (23,3% of patients were diagnosed as having pseudoexfoliation syndrome). In the branch retinal vein occlusion group only 9,3% of patients had pseudoexfoliation syndrome. In control group only 8,6% of patients had this syndrome. Control group was made of 80 patients similar in age without any retinal and cardiovascular abnormalities, patients with episodes of ocular hypertension, glaucoma, and those who had undergone cataract surgery were excluded from the study. Pseudoexfoliation syndrome may be considered as an independent risk factor for development of central retinal vein occlusion
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Description
In the article, we show the need of improvement of quality of the public and municipal services and level of satisfaction of the population. It is proved that development of electronic public and municipal services is an important component of increase in effectiveness of control, development of economy and the social sphere and formation of digital economy. Development of the social sphere, the system of public administration, interaction of citizens and the state is possible only using information and communication technologies. It is probed: development of technologies of electronic interaction of citizens, organizations, public authorities and local government; application in public authorities of Russia of the new technologies providing improvement of quality of public administration; enhancement of mechanisms of electronic democracy. There is a need of lowering of duplicating of expenditures on development of electronic public services and portals. Formation of information space taking into account needs of citizens and society for obtaining qualitative and authentic data, use of infrastructure of the electronic government will change idea of rendering the public and municipal services for citizens and will give the following opportunities: one access point to federal and regional services; convenient search and addressing directories; a private office with complete history of operations, addresses and correspondences; legally significant notification messages from the state; interactive informers on penalties and debts; the modern interface with a complete support of mobile use; the help and support for consultation in extraordinary situations; independent control of services and content