№ 131(7), September, 2017
Public date: 29.09.2017
Archive of journal: Articles count 124, 307 kb
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OPPORTUNITIES OF REGIONAL AGRICULTURE IN IMPORT SUBSTITUTION
DescriptionThe problems of import substitution, resource features of the agrarian economy, through which you can generate significant competitive advantage, are discussed. It is noted that low abroad interest rates on loans create obvious unequal starting opportunities throughout the domestic business. As a result the cost of imported food in value chain terms reached in our country an enormous rate of $45 billion and that government realized the need of strengthening of food security, transferring of production of traditional kinds of products which form the basis of consumption of the population in our country, to the domestic market. It is noted that we need temporary moderate state protectionism and protection of the domestic market with the aim of modernizing the economy, attracting investors in the important field of production with high risks. The main problems and solutions that will help to further successful implementation of this strategy in the sectors of our economy are highlighted. It is noted that our region has the most effecting rural industrial structure, the best country’s climate, enlarged crop rotation, cheap labor resources, extensive experience in agribusiness. It is proposed to perform a set of measures to reduce systemic risks in agribusiness
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COMBINATORIAL DIAGNOSIS MODEL OF A POWER OBJECT
DescriptionThe present level of development of power systems, the need to increase their resources and increased competition have caused especially true problem of increasing the efficiency of their operation. The work is devoted to the justification of the selection and development of a technique of construction of the diagnostic model to search for failures in power objects
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EXPERIENCE OF SCREW ROTORS DEVELOPMENT AND DEPLOYMENT
DescriptionThe article offers a method of details finishing and cleanup processing based on the details and working environment granules mass hashing in combination with the target transporting movement from loading to unloading. Such combination is provided by means of technological process in which the movements are carried out at the expense of the working body executed in the form of a complex screw rotor with the multidirectional screw surfaces formed by flat elements. Four screw rotors designs and methods of their assembly as well as the recommendation on the use of screw rotors are shown: "The movement of the processed details and particles of a working environment is the most complex and infinitely various among the I class screw rotors and the most elementary and uniform among the IV class screw rotors". The practice and experimental control of the details finishing technological process introduction efficiency in screw rotors have shown that for the considered case productivity of, for example, agnail removal increases tens of times. It is reached not only at the expense of the possibility of continuous processing provision in screw rotors, but also due to significant increase in amplitudes of low-frequency fluctuations which are reported to loading masses by the screw rotors machines located at different angles to each other and to screw rotor rotation axis
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Description
It is estimated that (85-95%) of the electric motor failures occur due to damage to the stator winding. In this case, more than 90% of damage are because of interturn short circuits. Short circuits in stator windings of stand-alone asynchronous generator change the base magnetic flux incidentally, so the probability of its long work with such kind of damage is great. A latent failure, existing as a loop closure, significantly reduces the reliability of the generator as a backup power source. Now sensitive protections of asynchronous generators do not exist, since it is believed that in the case of short circuits (short circuit), the generator loses its excitation, and protection is not required for it. Identification of information signs of short-circuit currents in the stator winding of an asynchronous generator makes it possible to develop relay protection. The main principle of detection of stokes closures in the stator winding of an asynchronous electric motor is the measurement of the emerging asymmetry of the stator currents. It has been established that in the case of short-circuit faults, the asymmetry of the currents and voltages is not large and comparable to the asymmetry in the AAG load circuit. This does not allow performing a protection that reacts to this asymmetry. You can also say about changing the harmonic spectrum of currents and voltages. To build protection, it is necessary to use highly sensitive circuits for detecting the asymmetry of a three-phase system of currents and voltages, as well as distortion of the shape of currents and voltages, for example, by harmonic analysis. Do not exclude the possibility of using other protection devices, such as reacting the vibration of the case of an induction generator in the event of damage to the stator winding
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FEATURES OF MODELING OF TECHNOLOGICAL OPERATIONS OF AGRICULTURAL RAW MATERIALS PROCESSING
DescriptionThe ways of improving the work of food enterprises during processing of agricultural raw materials on the basis of a system analysis of the durations of technological operations are considered. The basic mathematical models of technological processes have been analyzed and the possibility of using unified technological operations to predict the time of completion of work has been shown for processing various pairs of raw materials. It is established that the construction of mathematical models of technological processes of processing of agricultural raw materials should be based on using the potential of transfer of the target component between isopotential surfaces. This allows not only to unify the created models of technological processes, but also to significantly increase their extrapolating ability to estimate the durations of technological operations
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APPROBATION OF THE SUBSTANTIATION METHODS OF THE INTERNATIONAL TIMBER TRANSPORTATION PROCESS
DescriptionModern small logging enterprises exporting timber primarily by lorry transport do not have resources for implementing research that contributes to reducing the cost of this type of transport. Besides, there is no universal and accessible planning methodology and operative decision-making in the organization of timber export by lorry transport. Because of this, the author of the article has proposed a methodology for improving international timber transportation by timber trucks. This methodology contains logging modeling simulation, as well as analysis and contain of different options of logging. Within the framework of this methodology, a unique model based on the discrete event simulation has been developed. This model simulates a full cycle of timber transportation from the terminal to several foreign consumers. The working capacity of the model was verified by simulating several export scenarios based on data obtained during field study at one of the logging enterprises, the annual logging volume of which is 400 thousand cubic meters. The analysis and comparison of the modeling results have confirmed the possibility of using this methodology in planning and organizing international timber transportation for small logging enterprises
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OPTIMIZATION OF THE PARAMETERS OF WORKING PARTS FOR THE PREPARATION OF TOBACCO LEAVES TO DRYING
DescriptionIn the article there are results of theoretical and experimental researches on creating a working part for leafsplitting and orientation of tobacco leaves when preparing for their drying
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06.00.00 Agricultural sciences
DescriptionIntensification of agriculture during the twentieth century was accompanied by an increase in international trade, resulting in the resettlement of many species across continents. As a result of these processes, many adventives species have become economically significant and dangerous plants in agro and urban biosensors. One such plant is Ambrosia artemisiifolia L., imported from North America to Russia. The use of chemical means of suppression of A. artemisiifolia L. often does not give positive results in agrocenoses, because of its biomorphological features. In urban areas, within the boundaries of sanitary zones, the use of chemicals is prohibited. Therefore, the most promising direction in the suppression of ragweed ambrosia is the ecologies method. The article discusses the possibility of using an ambrosia leaf beetle in the feeding of ragweed in the territory of Russia
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Description
To reduce the development of additional settlement strip foundations of the existing building on the effect of pressure transmitted to a ground base located near the new slab foundation is considered the work of the geotechnical barrier in various ground conditions. In the first variant of soil, conditions (variant 1) made geotechnical barrier structure in a homogeneous thickness of the weak clay soil. In the second variant of soil conditions (variant 2), a separating barrier is performed in a two-layer base. The upper base layer (carrying) is shown a weak water-saturated clay soil, and the second (underlying) - low compressible soil (sandy loam plastic). According to the results of the calculations and modeling found that, the greatest positive effect on the separating barrier structure (geotechnical barrier) is achieved in the case when the base is a two-layer. The lower part of the geotechnical barrier must be recessed into the soil of low compressibility. Additional settlement strip foundation of the existing building in a uniform basis (variant 1) in the absence of geotechnical barrier is approximately 8 cm. In the case of a two-layer base (variant 2), the additional settlement strip foundation building is reduced by 80-85% (6.6 cm) and will make about 1.4 cm
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TOOLS FOR OPTIMIZING PRODUCTION MANAGEMENT TAKING INTO ACCOUNT PRICING MODELS
DescriptionThe state of any economic system depends on the values of its parameters, both in the current period and at previous times. Therefore, in the process of optimization of production management, it is necessary to take into account this feature of the development of the systems under consideration. The most important task of economic research is the establishment of an equilibrium price. The most suitable hysteresis converters for solving this problem, the formal description of which is based on their operator interpretation. However, at present, when analyzing the functions of supply and demand, a cobweb-like model and its analogues are used, as a rule. This article discusses the unresolved problem of optimizing production under conditions of hysteresis pricing and competition. Taking into account that their mathematical modeling is the main method of analyzing economic systems with hysteresis properties, different pricing models (discrete and continuous) are considered in the article, as well as economic and mathematical tools for optimizing production activity under hysteresis pricing conditions. The developed models can be used to increase the adequacy of the formal mathematical description of the corresponding systems, which is the basis for more accurate forecasts of their development. In the conditions of hysteresis pricing, production optimization algorithms will allow to create optimal (in terms of achieving maximum profit) price and production strategies for the development of economic systems