№ 133(9), November, 2017
Public date: 30.11.2017
Archive of journal: Articles count 94, 254 kb
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THE METHOD OF CALCULATION OF FILTERS FOR STATIC CONVERTERS OF ELECTRIC POWER
DescriptionOne of the important issues in the design of static converters of electric power, i.e. rectifiers and inverters, is to calculate the parameters of the output and the input filters. Output filters are designed to improve the quality of output voltage of inverters, and input filters are created to reduce ripple of the input voltage of the converter that occur when commuting power semiconductor devices, and smoothing fluctuations of the current consumed from the power supply. The complexity of analytical description of the harmonic composition of the output and the input of the voltage rectifiers and inverters makes it difficult to develop some accurate methods for calculating the parameters of their filters. At the same time, considering the discreteness of the number of possible parameters of real elements of the filter, the practical value of such techniques with a high analysis accuracy of the harmonic components is negligible. In this article, we suggest the technique of the simplified calculation of output and input filters for passive LC filters rectifiers and inverters. At the same time, the practice of mathematical modeling and design of transducers has shown that the calculations of the filter parameters for rectifiers and inverters are not significantly different from each other. Therefore, the analytical expressions for calculation of the filter parameters of rectifier used ripple coefficient, and if necessary the calculation of the filters of the inverter, instead of the pulse number in the formula can be substituted with the value of the harmonic; in addition, we have also taken into account the value of the load power factor
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METHODOLOGY OF MODELING SOCIAL SYSTEMS FOR CONFLICT ANALYSIS AND CONTROL
DescriptionThis article provides results of studying the world achievements in modeling social systems in the aspects of personality, group, and social institute (e.g. the state and army). Through prism of conflict, we review research methodology for modeling social identity, social navigation, geopolitical processes, and command and control systems of the enemy. We discuss four agent-based models of social identity: SCIPR, MetaContrast, PS-I, and SILAS. We examine Spence model for modeling social navigation. Basic principles for modeling relations between the states are considered using ontology approach. The presented model allows systemic analysis of various micro- (intrastate) and macrolevel (external) variables and relations between them. Modeling command and control system of the enemy is implemented as a part of an automated decision support system that tackles the problems of enemy structure identification as well as classification of objects and relations within the structures. The object of study are approaches, methods and models for representation and analysis of group interaction. The subject of study are processes of agent self-identification and interaction, formal and informal organizations, the states and public institutes as well as processes and principles for group formation and mechanisms for behavior control. Research methodology: social network analysis, ontology approach, theory of graphs and hypergraphs, multiagent systems
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MANAGEMENT METHODS TO INCREASE PRODUCTION EFFICIENCY
DescriptionThe article examines the socio-psychological, sociological, and psychological methods of management and also creation of a favorable psychological climate in the team and methods of influence on the staff. The evaluation of the system of management and incentives of staff was performed on the example of Bezopasnost company
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MODELS OF NEURONS WITH MEMORY OF STATE FOR ORGANIZATION OF NEUROEVOLUTIONAL CALCULATIONS
DescriptionThe article discusses the model of a neuron with memory. The proposed model is formed based on the model of the dynamic neuron. The proposed solutions allow to efficiently model dynamic processes and to provide a two-level scheme for evolution of neural networks. The first level of evolution is achieved using traditional neuro-evolution models that allow you to create or to modify basic network settings. The second level allows you to track the history of the development process. The article presents a formal description of the proposed models and algorithms of functioning of the network, is the rationale for the use of the proposed models
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SIMULATION OF A POWER TRANSFORMER WORK WITH A HIGH LEVEL OF HIGHER HARMONICS
DescriptionThe importance of improving the quality of electrical energy was growing along with the development and wide implementation in the production of valve converters and various highperformance processing units, such as arc furnace, welding machines etc. The main causes of potential and existing non-compliances of non-sinusoidal voltages can be joining sources and non-sinusoidal reactive power sources, including resonant filters, to existing electric grids without taking into account their possible impact on the distortion of the sinusoidal voltage. Transformers are affected by the non-sinusoidal shapes of the curves of current and voltage. The effect is characterized by the fact that the harmonics of current and voltage increase transformer temperature, compared to purely sinusoidal current and voltage. The aim of this work is to study the influence of higher harmonics on power loss in power transformers. Experimental study of operation of power transformers was carried out on the developed model of the transformer substation. The experiments were conducted with different capacities of transformers that have variables in the range of 250-1000 kVA. By using programmable voltage source a sinusoidal voltage is formed containing the third, fifth, sixth, seventh, ninth and twelfth harmonics. The level of harmonics is changed in the range of 2-12 %
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TAX POTENTIAL: DISCUSSION APPROACHES TO THE DEFINITION AND METHODS OF ASSESSMENT
DescriptionSubjects of Russia are not uniform on composition, structure and security with financial resources, respectively, on the level of economic development. Therefore, the search of an objective indicator for distribution and redistribution of financial resources has resulted in the idea of use of the value of tax potential of the region, which is used in foreign practice since 80s. It can be widely used both in the intrabudgetary relations, and in regional budgetary and tax systems within the regional analysis of management of development of the territory. This indicator is of great importance for regional authorities as the value of tax potential determines the value of incomes of the regional budget and, therefore, a possibility of implementation by regional bodies of their functions. Based on the analysis of the value of tax potential, its actual use, the scientific and methodological validity of final decisions on management of the region and, in particular, in the sphere of tax policy is increased
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NEW GROWTH REGULATORS AND ANTIDOTES FOR ENVIRONMENT-FRIENDLY PLANT PROTECTION
06.00.00 Agricultural sciences
DescriptionSearching for new promising plant growth regulators and antidotes, we have synthesized a series of Nsubstituted naphthalene-2-sulfonylamides. Synthesized compounds have been studied as potential growth regulators of economically significant crops - winter wheat, sugar beet, sunflower, soybean, and herbicide antidotes for sunflower growing plants. The substances with high growth stimulating and antidote effect were found
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TO THE QUESTION OF MATHEMATICAL MODELS OF MATERIAL FLOW MANAGEMENT
01.00.00 Physical-mathematical sciences
DescriptionThe article concentrates on the matters of current interest in the sphere of product flows. The object of research is the relocation of product flows from the supply sphere, represented by supply and sales organizations or other commercial-intermediary agencies, to the sphere of business enterprise. The ultimate goal of the production and economic system modeling is the preparation for managerial decision-making. The choice of the model depends on the purposes of the modeling, management functions, automation manufacturing step, applied mathematical tools technique. The article considers the main characteristics of the flow, which while retaining their individuality at the same time depend on each other and function logically in the economic space. The advantages and disadvantages of the material inventory and flows management in micrologistic intraproductive systems are being analyzed. External and internal environment, taken as a basis for the real logistical process modeling, determine the type of the principal stock regulation system and the type of the corresponding mathematical model. Methods and models of the stock theory, the primary objective of which is to determine the most important incoming product flow parameters of the system, are still in demand and their primary goal is to adapt the manufacturing company to the consumers’ needs
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ENFORCEMENT OF THE RIGHTS OF THE MINORITY OF ACCUSED ATTENDING THE MATERIALS OF THE CRIMINAL CASE
DescriptionThe article explores the problems, acquaintance with the materials of the criminal case of a minor accused in the aspect of ensuring his rights as a defender and legal representative. With a view to the proper legal regulation of this procedure, it is proposed to establish a procedure for the joint familiarization with the criminal case file of counsel and the legal representative of a minor accused in the norms of the Code of Criminal Procedure, as well as the procedure for compulsory participation of a legal representative of a juvenile accused while acquainting himself with all materials of the criminal case
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REVIEW OF THE CONCEPTS OF DISCOURSE ANALYSIS (THEORETICAL AND PRACTICAL ASPECTS)
10.00.00 Philological sciences
DescriptionThe article provides the review of the main concepts of discourse analysis, proceeding from a theoretical and practical criterion. The approaches to the analysis of discourse are realized in the models, which enable to carry out a productive research of different types of a discourse, and are generalized in a diachronical aspect. Among them, one can find the concepts which go back to "dialogical aesthetics" of M.M. Bakhtin and the views of the French school of discourse analysis. The conclusion about the efficiency of integrative approach is drawn