05.00.00 Technical science
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METHODIC OF KNOWLEDGE ASSESSMENT WITHIN THE FRAMEWORK OF THE AUTOMATED TESTING SYSTEM
DescriptionIn this article, we consider approaches to the transfer of knowledge to students and an objective semiautomatic assessment of knowledge. The characteristic features of the application and the possibility of using cognitive training methodologies and complex systems for testing skills and the theoretical base of trainees are analyzed. The problems of development of this direction and possible ways of their solution are described. The basic concepts are introduced and the existing methods of calculating the average score for checking the student's knowledge are considered, and a new approach to solving this problem is proposed. Based on the conducted researches it is offered to use the complex system of testing of end users, which includes testing, monitoring, collecting, analyzing and displaying the results of students/groups/ course. The main requirements for the creation of such a complex and the rules to be followed are formulated for a more objective assessment of knowledge. A model of an integrated modular system for objective semi-automatic testing of knowledge through testing is described
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DEFINITION OF PROBLEMS OF ASС OF A PRIMARY WINEMAKING PLANT
DescriptionAutomation of productions is a necessary condition of reduction of losses for processing enterprises. Any automated system contains subsystems, each of which solves specific objectives, being at the same time accessory of all system. Therefore, when starting designing a system of acceptance and processing of raw materials, it is necessary to define the importance of result of the solution of each task for increase in efficiency of a production cycle. In the article we present results of expert polls of experts – wine makers for definition of problems of automation of processes in the plants of primary winemaking
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Description
This article describes the experience in the development and implementation of the method of qualimetric evaluation of contractors based on the application of the methodology of multicriteria rating. The introduction of the qualimetric assessment into the practice of management activities allows reducing the risks of selecting unreliable contractors, to increase the efficiency of construction and investment companies, and their competitiveness in the construction services market
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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 an algorithm to compute the discrete control of the composting process in the thermophilic stage. This article 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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INNOVATIONS IN THE TECHNOLOGY OF DRY BREAKFAST PRODUCTS MANUFACTURING
DescriptionThe intense rhythm of people's lives in many countries has led to the need to develop and produce «fast food» products. They include dry breakfasts of a porous macrostructure in the form of rods, bars, and flakes, made from cereals, legumes, potatoes and dried fruits. Over the past 10 years, ready-to-eat foods that do not require heat treatment have become popular, the range of breakfast cereals has significantly increased, air grains, pads with filling, asterisks and rings have appeared. The global trend of consumption of slowly digestible carbohydrates predominates. Corn flakes and blown grain began to be used as supplements to soup instead of toast, served for tea and coffee. However, the problem of making and marketing specialized dry breakfasts has not yet been fully solved. The aim of the research is to expand the range of specialized dry breakfasts for people with high physical and mental loads. The tasks of modernizing technology and equipment for the production of dry breakfasts were solved. The methods of preparation for extrusion of easily oxidized in the air raw nuts were developed. Formulations of dry breakfasts for people with high physical and mental loads were developed. The objects of the research are analysis of existing technological schemes, grain, fruit and nut raw materials. We used classical methods of research to determine the composition of proteins, lipids and carbohydrates, as well as modern instrumental methods for assessing the qualitative composition of raw materials, semi-finished products and finished products. The research results include the modernization of technology and equipment for the production of breakfast cereals. Formulations of ready-made breakfast cereals with the addition of cereals, dry fruits and nuts have been developed, in order to improve the quality characteristics and nutritional value of the extrudates. The proposed technology and developed recipes are promising for introduction into production
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THEORETICAL STUDIES OF THE HEATING SYSTEM OF A CATTLE-BREEDING COMPLEX
DescriptionThe article describes the modeling process of the heating system operation of a livestock-breeding complex. It presents graphs reflecting the influence of technological parameters of heat supply system of cattle-breeding complex with a catalytic combustion device on the parameters of energy efficiency of the system and the parameters characterizing the stability of the temperature conditions in the livestock sector
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MODERN DEVELOPMENTS IN THE FIELD OF SUPERTHIN CRUSHING OF FOOD FIBRES
DescriptionIn this work, we have analyzed the multiple literary sources and summarized the material regarding beet dietary fibers. Their composition, physicochemical, physicomechanical and hygrothermal properties were studied. The study of the particle-size distribution showed that the content of the insoluble fraction exceeded the content of the soluble fractions in all the samples. The use of the secondary products of processing of the plant raw material is also critical; they allow improving the preventive properties of products and enriching them with dietary fibers, protein, and mineral elements. The properties and quality of the raw material are, to the large extent, determined by and depend upon its granulometric composition, that is, upon the size of particles that compose this object. The authors determined the granulometric composition of the studied nutritional supplements. It was found out that the use of the combination of the impacts together with the abrading impact led to the intensification of the process, a decrease in the milling time and the uniformity of the obtained granulometric composition. The choice of the vertical mill as milling equipment in combination with the metal balls added to it to increase the efficiency of milling and uniformity of the granulometric composition of beetroot fibers was proved experimentally
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VOLTAGE REGULATION OF SOLAR POWER PLANTS AUTONOMOUS INVERTERS
DescriptionIn agricultural production, the direction of introduction of renewable energy for power consumers remote from the external electrical network is relevant. Here, prospects are revealed in front of the solar PV stations. One of the main functional units of solar power is inverters that convert the DC voltage of the solar panels into alternating current. The article describes the advantages and disadvantages of the main methods of voltage regulation of the autonomous inverters of solar photovoltaic power plants. We have proposed new structural designs of autonomous voltage inverters, described their advantages, features of design and operation for voltage stabilization. We suggest stand-alone inverters designed using high frequency link, which will significantly improve mass and dimensions parameters of the converter. Due to the use of single-phase transformer with a rotating magnetic field in stand-alone inverters, we improve the efficiency of the converter and the reliability of the work. Patents of the Russian Federation confirmed the novelty of technical solutions of the considered schemes of autonomous voltage inverters. Structural schematics of the voltage regulators considered in the article, as well as features of their work, will allow to increase efficiency of preliminary works on development of autonomous voltage inverters with improved operational and technical characteristics for solar photovoltaic power plants
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Description
At the nodes of the various machines, we use plain bimetal bearings: a steel base - antifriction cladding layer. Bimetal bearings have increased performance. One of the ways of making such bearings is the way of centrifugal bimetallization with heating of the independent electric arc. An important requirement of this technology is a uniform heating of the workpiece along the entire length until the formation of a continuous layer of the molten cladding material. The process of bimetallization require temperature control, since within the movement of the electric arc, low heat or high heat are possible due to heat dissipation from the ends of the workpiece in the installation and from the outer surface of the workpiece to the environment. A viable option the temperature control of the heat process of bimetallization for industrial conditions is to control the temperature of the outer surface of the steel base. It is necessary to solve the heat problem of the relationship between the temperature on the surface of the workpiece with the temperature on the boundary layers. For this purpose the numerical solution of the mathematical model of the thermal process, which includes the heat transmitting equation of Fourier and heat transfer at the ends of the sleeve according to Newton's law. The equivalent coefficients of heat transfer are obtained based on calculated and experimental thermograms. This is a time-consuming work. To minimize the time of fixing the boundary value problem of the thermal process of bimetallization, in this work we present the preliminary modeling based on the analytical solution of the thermal task of bi-metallization
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Description
With the aim of improving the productivity and performance of the sunflower seed separation process in the air-sieve seed-cleaning machine called MVU-1500 its multivariate analysis was carried out. The main indicators of the seed heap separation process were determined according to the feeding of the seed heap onto the sieve of the lattice. The indicators are as follows: completeness of the j-th components screening, the j-th components content in the sieve path, the completeness of their discharge and their content in the discharge from the sieve tier. Having adopted the hypothesis of a possible increase in the efficiency of the separation process in the air-sieve grain cleaning machine, we analyzed the delivery patterns of seed heap components into the pneumatic channel with the aim of optimizing the process. For a more complete assessment of the process indicators under consideration, basic patterns of movement of various components in the sieve-tier lattice were estimated. It was taken into account that in modern designs of air-sieve grain cleaning machines seeds are fed into the pneumatic channel from the sieves. When the width of the lattice is equal to one, the density of the j-th component of the seed heap is constant along the length of each sieve in the stack of sieves and the separation coefficient is constant along the length of the sieve, the expression received estimates the average speed of movement in the first sieve-tier lattice in the steady process of separation. There was evaluated the statistical significance of differences of the j-th component average speed movement on the second sieve- lattice by Student's t-criterion, which showed that they belong to the same sample of random variables and do not have statistically significant differences. Therefore, we can obtain the following velocity values of the heap of sunflower seed movement in the sieve-tier lattice: fragments of stems velocity is 0.0518 m/s; milled seeds velocity is 0.0381 m/s; velocity of sunflower seeds less than 3.2 and 3.2-3.6 mm thick is 0.0835 m/s, velocity of sunflower seeds of 3.6-4.0 mm thick is 0.0453 m/s, that of more than 4.0 mm thick is 0.0410 m/s