South Federal University
Author list of organization
List of articles written by the authors of the organization
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Description
In this article, on the basis of phenomenological consideration of kinetic processes in semiconductors volume, we have conducted an analysis, in order to estimate the drift and diffusion components of the output current for hot carriers in the total output of the conductivity structure of the chip. The result revealed amplitude and frequency characteristics of this component of the conductivity, illustrating a greater amount of its modulus and phase inversion near the field-strength values of Ghan effect. This can be used for designing oscillators of millimeter range of wavelengths. It is shown that the nonlinear diffusion component along with the drift is important for the output conductance of the test specimen
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Description
Based on the analysis of modern scientific approaches to the construction of complex information-measuring systems, we have formulated a circuit solutions model of a distributed system of control of parameters of soil, the implementation of which will allow to build systems in small businesses
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Description
The influence of auto-displacement in a resonancetunnel diode (RTD) on the dynamic range of amplifiers on these diodes is considered in the article. The amplification at resonance frequency is considered and the influence of higher harmonics is not taken into account, since they do not create a significant voltage drop at the nonlinear resistance of the diode. It is assumed that the gain will be sufficiently large, and then the nature of the dependence of the gain factors on the degree of regeneration will be the same for amplifiers "per pass" and "reflection". This allows us to consider the problem for both types of amplifiers on the RTD. The types of amplitude characteristics , which are possible for the RTD amplifier, are considered. The dependences of the parameter determining the dynamic range of the amplifier on the position of the operating point for several values of the product of the resistance on the direct current of the supply circuit are calculated for the value of the modulus of the maximum negative conductivity of the tunnel gap RG max. For each value of RG max for given parameters, you can determine the position of the operating point, which provides the specified amplifier mode. Dependences of the value of the dynamic range are constructed with allowance for auto-displacement and in the absence of auto-displacement for two values of the degree of regeneration. Taking into account autosplacement, two possible types of amplitude characteristics and boundaries of their existence were revealed. For these two types of amplitude characteristics, expressions were obtained that determine the dynamic range of the amplifier
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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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SOLUTION OF THE OPTIMIZATION PROBLEM FOR ELASTIC-DAMPING MECHANISM PARAMETERS IN PLOWING MODE
DescriptionThe article is devoted to finding of the optimum parameters for elastically damping mechanism (EDM) which is located in transmission of machine-tractor unit (MTU). The investigated MTU is based on the tractor of 1.4 class in plowing mode. EDM is designed for MTU in order to make its’ start smoothly, to reduce the dynamic load in transmission, to protect engine from the external load vibration. The “transmittance level” (index T) is used as evaluation of the protective mechanism quality. The study was carried out by means of the experiment planning method, viz. the central composition plan of second order with five factors. A regression model for response function (“transmittance level”) is given. This model takes into account the chosen EDM characteristics. The statistical analysis methods (Student’s t-test, Fisher’s test) were used to study the regression model. The dependence of response function on each factor apart, their cross impact on the process are described. The system of partial differential equations is obtained to find the optimal values of parameters and response function. The optimal value of a “transmittance level” can be obtained by varying different EDM parameter values. Optimal values of parameters and as result - response function - allow improving of MTU functioning in plowing mode
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Description
The results of laboratory experiments on the effect of different concentrations of SkQ3 (10- (6'- methylplastoquinonyl) decyltriphenylphosphonium) on the rate of growth of spring barley seedlings of varieties Sokol and winter wheat varieties Kalym in normal and under inadequate moisture conditions, as well as data from field experiments on the effect of pre-sowing processing SkQ3 on the morphometric indices of spring barley varieties Shhedry, hard winter wheat of the Lazurite variety and soft winter wheat of the Lydia variety are presented. As a result of laboratory experiments, an increase in the growth rate of 14-day-old seedlings grown in solutions of polyethylene glycol was shown when treating the seeds with 2.5 nM and 25 nM with SkQ3 solutions. In the field experiments on the pre-sowing treatment of SkQ3 seeds, an increase in the morphometric indices of spring barley varieties of generic Lydia soft winter wheat and hard Lazurite winter wheat has been established, as well as an increase in the yield of winter wheat of both varieties as compared to the control
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TEMPORAL HARMONIZATION IN PLANNING ACTIONS OF GROUPS OF OBJECTS IN REAL OPERATING TIME
DescriptionThe article considers problems of constructing a temporal processor in the planning and management of a multitude of objects using various temporal theories of representing temporal factors of perception of the external environment based on the phenomenon of human memory
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Description
One of the key areas of interdisciplinary research is to ensure public safety. In order to solve a number of problems within this area we can effectively use information technology and, in particular, an automated pattern recognition technology and identification of objects on digital images. There are addition problems in objects identifying process besides eliminating the influence of ambient light, angle, items of clothing and headgear. To ensure the applicability of the recognition approach to public security issues it must meet requirements of the high processing speed, the replenishment capabilities onthe-fly list of known images, and the low computational complexity of algorithms. The article deals with the main approaches to the recognition and identification of objects on digital images based on statistical approaches, as well as neural network models. We have allocate their basic features and principles, provided a brief description of each method. Consideration has been made in terms of the application for the problems of public safety, in which there is importance of the speed of the identification of the object, the ability of quickly learning for the system to accept new images and simultaneously process a plurality of input images. The analysis of the existing approaches has shown that none of them satisfy at least one or several needs, which are defined by domain problems of public safety
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CONTROL OF TECHNOLOGICAL PROCESSES BASED ON SCADA
DescriptionSCADA is modern information technologies. The monitoring and control of various technological processes in industry and in agriculture are possible thanks to these technologies. The training complex is created to study features of SCADA systems. The domestic SCADA Trace Mode The domestic SCADA Trace Mode is used in this complex. Students study the abilities of this system on the example of the heating process. Trace Mode controls humidity and regulates temperature in a closed space. Its advantage consists in creation of automatical workstation. There are a device for accurate temperature measurement; Video, which repeats the work of the heater on the screen of the workstation. There is also a trend with graphs of humidity, of temperature; there is an alarm report with information on the magnitude and timing of the process failure. Among them, there is a device for accurate temperature measurement; video, which repeats the work of the heater. There is the picture with graphs of humidity, of temperature and of the target on a temperature also, there is a report of the alarms about information on the magnitude and timing of the failure the process. A distinctive feature of the developed this complex is to provide students opportunities for acquiring skills of design and operation training of the automated control system of technological process of heating with the holding of tests in real time. After studying one SCADA system, students are easily transferred to work in another system, for example, Master SCADA, domestic producer InSAT
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OBJECTIVES AND METHODOLOGY OF CROSS-CUTTING DESIGN OF TECHNICAL SYSTEMS
DescriptionThe debate continues about reform of higher education In the country. We offer our point of view regarding the preparation of bachelors and masters on the direction of "Control of the technical systems". Department of automatic control systems leverages variable disciplines of specialization and optional subjects, forms a curriculum based on the needs of the business environment of the region or commissioned by a separate large enterprise. Students participate in the modules of project activities, form new and effective engineering solutions, to get skills of their practical implementation with regard to effectiveness, relevance and prospects of their further development. The production practice is very important in the preparation of bachelors and masters. To this end, the agreement on cooperation in the field of improvement of quality of preparation of students of SFedU concluded with the company RealLab (www.rlda.ru). It has allowed undergraduates to pass a work practice at the enterprise, custom-making thematic tasks of the enterprise on a contractual basis. Graduates of magistracy successfully find a job at the enterprise, providing thus strengthening of personnel structure. In this study, we propose a technique of teaching of bachelors and masters in "Control of technical systems". The main thesis is to use the technique of through projecting throughout the entire learning process. The trajectory of training is built for the student based on a module of project activity, training and production practices. The student studies the object, develops the control algorithm, programs it, chooses a set of technical means throughout the entire period of training with an exit to the protection of the final qualifying work