№ 130(6), June, 2017
Public date: 30.06.2017
Archive of journal: Articles count 87, 224 kb
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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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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
It is known, that the voltage deviation from the nominal value leads to a change in the technical characteristics of the equipment and may cause a violation of their working ability, including leading to an emergency. The article deals with the known structural diagram of single-phase voltage stabilizers of AC power, the peculiarities of their work and their disadvantages. To improve the performance characteristics of single-phase AC voltage stabilizers, we have proposed a functional scheme of the stabilizers performed on transformers, autotransformers and optosymistors. The article considers features of the proposed circuit voltage stabilizers. To stabilize three-phase voltage we have proposed using a three-phase stabilizer. In this case, to improve the reliability of the reserve there may be a single-phase stabilizer, which automatically connects to the appropriate phase at malfunction of one of the working electronic voltage stabilizers. To stabilize three-phase voltage, a stabilizer can be made based on the three-phase transformer. In comparison with the use of a single-phase stabilizer in a three-phase system, the voltage stabilizer will have improved weight and overall dimensions. To significantly improve the technical characteristics of voltage stabilizers, working in the autonomous power supply systems, it is possible only through the use of modern mathematical apparatus, allowing to simulate the physical processes in power circuits of stabilizers in nominal and emergency modes of operation
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FAIR VALUE OF PROPERTY, PLANT AND EQUIPMENT OF THE ORGANIZATION ACCORDING TO IFRS
DescriptionFor national financial accounting, fair value is really a problem. The reasons for that are various. First, there is an opinion that assessment procedure is not accounting "case", we have appraisers for that. The entities do not hurry to estimate fair value independently not to violate the law on assessment. They do not do it for the reason that transition from estimates on original cost to estimates is at fair value quite reasonable and we accept from the point of view of improvement of quality characteristics of the reporting, and here the return transition is rather complicated, even, one may say, is impracticable. Often, estimates at fair value are considered as the instrument of a fraud, a manipulation financial results and the financial reporting in general. Besides, use of estimates at fair value increases expenses on creation of the financial reporting that not every entity is able to afford in the conditions of national business. Use of fair value can significantly influence indicators of activities of the entities, and not always positively. In addition, certainly, assessment at fair value is a professional judgment for which in most cases nobody wants to bear responsibility. Nevertheless, as we are headed for IFRS, we shall promote overcoming difficulties of use of fair value for the purpose of creation of IFRS reporting. There is a popular belief that the IFRS reporting are constructed on fair value. To some extent, this is true, but fair value is a multidimensional concept. For example, historical cost value of the asset purchased for money for date of transaction can be "fair" cost. The "fair" cost of the current receivables corresponding to recognition criteria an asset is the amount of its settlement. The "fair" cost of the obtained bank loan is the current (amortized) liability size for date of the financial reporting. However, this view of fair value is represented narrow-minded and can be sufficient unless for general idea about IFRS - the reporting, but cannot be used in the professional environment
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Description
The article provides an overview of Express-methods of quality evaluation and identification of lipidcontaining plant raw materials (oil seeds) and its processed products (oil cakes, oilseed meals, vegetable oils, lecithins) using pulse method of nuclear magnetic resonance. Development of express methods of quality evaluation and identification of lipid-containing plant raw materials and products of its processing is a priority, as these methods are environmentally safe and also allow us to regulate technological conditions of refining processes, are characterized by low error of determination, i.e., high precision, and, in some cases, it is only possible to use because of its non-destructive effects on the analyzed sample. Currently, we can distinguish the following main directions of quality evaluation and identification of lipid-containing plant raw materials and products of its processing on the basis of the pulse method of nuclear magnetic resonance: assessment of quality and identification of oilseeds (sunflower, canola, flax, soybeans); evaluation of quality of products of processing of oil raw materials (cake and meal); the quality evaluation and identification of vegetable oils; assessment of the quality of the lecithins obtained from vegetable oils. The methods of quality evaluation and identification of lipid-containing plant raw materials and its products are patented and have several advantages: short time (5 minutes) spent on the implementation of the single analysis; eliminates the use of toxic chemicals; does not require special training of laboratory personnel; non-destructive character, which is especially important for oilseeds from the point of view of breeding work. On the basis of the conducted survey we can conclude that the pulse method of nuclear magnetic resonance has found wide application for assessment of quality and identification of lipidcontaining plant raw materials and products of its processing, through rapid capabilities, high accuracy and ease of analysis
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COENOPOPULATION STATE OF SOME FABACEAE SPECIES UNDER CONDITIONS OF THE MIDDLE LENA RIVER VALLEY
DescriptionThe study concerns the results of the study of coenopopulations of the following Fabaceae species: Medicago falcata, Oxytropis candicans, and Onobrychis arenaria under conditions of the Middle Lena River. The study was conducted in Yakutsk vicinities, 13 km north-east of the city. It is stated that all the studied coenopopulations are normal. Rather small values of substitution and recovery indices evidence certain problems in self-maintaining processes. The age structure analysis using two age indices, “delta” and “omega”, allows to classify the coenopopulations of Medicago falcata, Oxytropis candicans and Onobrychis arenaria in phytocoenoses of the Lena River valley as normal young populations. They were prevailed by juvenile, immature, virginile, and young reproductive plants
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06.00.00 Agricultural sciences
DescriptionThe contents of lead in soils are primarily determined by regional factors: the composition of parent rocks, relief, climate, vegetation. In recent years, these factors have increased the anthropogenic source of element. In order to assess its impact, requires knowledge of the natural, i.e., background lead levels, the so-called reference points, which can later be used to monitor changes occurring in the soil. Under background refers to the content of the element in soils at a great distance from the areas of receipt of contamination. Background content of lead in each type of soil depends mainly on composition of parent rocks. The correlation coefficient between the content of lead in parent rocks and soils, with the background contents is equal to 0,86±0,17 at p=0,95. For each soil type there are low variations in lead content due to the composition of parent rocks. Lead concentrations in the soils increased at the expense of its receipt from the atmosphere, irrigation water, drainage during mining, as a result of agricultural use, lead containing chemicals. Comparing the obtained results with existing currently permissible concentrations (APC, MPC) it is necessary to note that the lead content in leached chernozem soil after three rotations of the rotation may not cause any pathological changes or anomalies in the course of biological processes and lead to accumulation in the agricultural plants, and therefore may interfere with biological optimum
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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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Description
The article gives a detailed analysis of foreign and mutual trade of the Eurasian economic Union as the main indicator of development integration. It is dealt with the amount and structure of foreign and mutual trade of the participating countries. Attempts are made to formulate and predict the main trends of development trade relations. Conclusions are drawn that Russia prejudges integration cooperation, because it is the leader in most economic indicators within the integration group
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PERFECTION OF METHODS OF GAS PURIFICATION ON THE BASIS OF SGV-7 GAS SEPARATORS OF VERTICAL TYPE
DescriptionThis article is devoted to the review of existing separation equipment. The principle of operation and advantages of a modern design of a centrifugal-vortex separator is described. The technique of repairing and modernization of obsolete separation equipment is described