bluuebunny/crossref_metadata_2025_split huggingface dataset:
The energy efficiency research of combined H-Darier-Savonius rotors for autonomous power supply of objects on land and at sea
Authors: Shishkin N D , Ilyin R A 
Published: November 2020

Abstract
For the first time, the experimental energy efficiency research of combined rotors of vertical-axial wind mill based on improved H-Darier and Savonius rotors, which have blades with flaps, were performed. The experiments have shown that the maximum power factor value of combined rotors reached 0.60, which is almost 1.5–2.0 times higher than that of commercially produced horizontal-axial wind mills. The semi-empirical formula is obtained that allows determining the power factor of the combined rotor with different geometric dimensions of the H-Darier and Savonius rotors that are part of it with different numbers of stages. Energetically, economically and ecologically efficient wind mills with combined rotors with the capacity of 1–10 kW can be used for autonomous power supply of heat supply, water supply of various facilities, for oil production on land and at sea, as well as for driving propellers of small vessels.
Polygeneration plants in the energy complex of oil and gas enterprises: the concept of synthesis and a method for assessing efficiency
Authors: Dolotovsky I V , Larin E A , Semyonov B A 
Published: November 2020

Abstract
The article proposes a concept for the synthesis of polygeneration plants as part of the energy complex of oil and gas enterprises, which expands the possibilities of inter-industrial integration of energy and technological systems in the direction of creating closed utilization cycles. An example of a complete set of equipment for an installation for the combined generation of energy resources, water and carbon black, utilization of wastewater and low-pressure hydrocarbon gases is given. A two-dimensional model of a multi-criteria efficiency index is proposed for the analysis of performance indicators and the efficiency of integration of polygeneration units with energy technology systems of oil and gas enterprises.
Minimization of hydrogen concentration in the superheated mixture at steam turbine working fluid overheating by mixing with high-temperature products of hydrogen in oxygen combustion at nuclear power plant
Authors: Schastlivtsev A I , Borzenko V I , Shmatov D P 
Published: November 2020

Abstract
A new design of hydrogen-oxygen superheater with hybrid cooling of the combustion chamber with feed water and low-temperature steam is proposed for smoothening the cooling process in order to reduce the residual hydrogen content in the process steam. The combustion chamber at this design consists of two parts. In the first part, external cooling with feed water is used for smooth cooling of combustion products to 1900 … 2100 K in the most thermally stressed zone. In the second part, low-temperature steam is used as coolant for external cooling, the temperature of the generated high-temperature steam is reduced down to 1400 … 1500 K. Finally, the obtained high-temperature steam is mixed with the working fluid.
Evaluation of the efficiency of thermal power plants in variable modes taking into account equipment wear
Authors: Garievskii M V 
Published: November 2020

Abstract
A significant share of nuclear generation in total electricity production, an increase in the share of renewable energy sources (wind, solar, etc.), variable electricity consumption schedules and changes in electricity prices in the market necessitate the use of thermal power plants in load control mode. Using the method of calculating equivalent operating hours to account for the reduction of the service life of the main equipment, the efficiency of thermal power plants in variable modes was studied. The equivalent operating hours of the K-300-240 turbine and the prime cost of electricity of the steam turbine power unit were calculated when operating in the nominal and sliding steam pressure mode depending on the level of unloading and the rate of change of output power.
Cylindrical condenser in a liquid cleaning device
Authors: Medvedeva O N , Sautkina T N , Kalyakin A M 
Published: November 2020

Abstract
The article presents the results of theoretical substantiation and experimental confirmation of the effectiveness of non-reactive technologies for cleaning liquids. The method of research includes the main theoretical provisions of the process of coagulation treatment of water taking into account modern trends of its development, modern methods of using this process of water purification, laboratory and production studies on natural waters using the developed device of non-reactive water treatment. Studies of sediment kinetics when settling water after its coagulation showed that the deposition time was reduced – from 30–40 min (without additional treatment) to 8…10 min when treating a coagulant solution in a spiral coil and to 3…5 min when treating in a spiral coil with electrostatic field application.
Method of advanced channel estimation in OFDM systems by regression technique
Authors: Bashkirov A V , Chirkov O N , Romashchenko M A , Glotov V V , Turetsky A V , Glotova T S 
Published: November 2020

Abstract
The article considers the task of increasing the efficiency of estimating the parameters of multipath radio communication channels used in the design of mobile remote access systems with orthogonal frequency division with OFDM multiplexing. In the conditions of an ever-growing number of subscribers, an increase in transmission speed and noise immunity of mobile radio communication systems, the task of increasing the efficiency of channel estimation in multipath signal propagation remains an urgent one. It is also essential that the evaluation function was performed with minimal complexity and with high accuracy of signal recovery. Within the framework of the work, the analysis of existing algorithms, models, and methods for estimating the communication channel parameters of OFDM systems is carried out, the main differences and disadvantages are noted. A technique has been developed for estimating the complex envelope of an OFDM signal in a multipath communication channel based on regression analysis. A mathematical model for estimating a discrete multipath channel by a regression method using pilot symbols is presented. The type of the approximating function is selected, taking into account the requirements for the complexity of implementation and performance indicators. We present an algorithm for estimating the complex envelope of an OFDM signal in a multipath communication channel by the regression method.
Towards the providing of the noises cancellation in the optical systems of the distribution and detection of the optical signals
Authors: Gurov M G , Gurova E G 
Published: November 2020

Abstract
In this paper, the scheme of the transmission system of the optical signal with the active phase compensation is suggested. This system is used for transmission of the frequency standards optical signals, distribution and detection of the laser radiation. The principles and algorithms of such systems are shown. The feedback corrector is presented. This corrector allows realizing the long continuous operation time of the suggested transmission system with active phase compensation.
Evaluation of effectiveness of data processing based on neuroprocessor devices of various models
Authors: Romanchuk VA 
Published: November 2020

Abstract
The paper presents the results of studying the efficiency of information processing based on neuroprocessor devices. We define analytical relationships that characterize information processing in neuroprocessor devices using modern and frequent architectures with sets of functional technical specifications used. The proposed relationships differ in that approaches, and characteristics unique to neuroprocessor devices are offered for evaluation. The obtained relationships can be used for simulating the operation of a neuroprocessor device; analysis of the effectiveness of information processing; optimizing program code to improve performance.
Main electromagnetic jammer sources with impact on the railroad automation systems
Authors: Shamanov V I , Pultyakov A V , Trofimov Yu A 
Published: November 2020

Abstract
The article presents some results of research to improve the stability of rail circuits and automatic cab signaling on the Railways. Signals of automatic locomotive signaling under the influence of stationary harmonic and random impulse noise are considered, the sources of which can be power lines, power devices, radio frequency electromagnetic fields, electrostatic discharges, lightning discharges, traction power supply and rail networks, as well as adjacent rail circuits. Particular attention is paid to the negative effects of reverse traction current and the uneven magnetization of the rails. It is shown that the practical implementation and application of the developed methods to increase the reliability of automatic locomotive signaling systems should suppress powerful interference from reverse traction currents that occur on locomotive receiving coils during heavy train traffic. Also, this should provide suppression of interference from the uneven magnetic field of the rails laid in the path or in the rut and at the ends of the sleepers. This will lead to a decrease in the intensity of failures in the operation of automatic locomotive signaling and to an increase in the level of safety and uninterrupted movement of trains. The results are successfully used on the railways of Russia and abroad.
Digital watermarks with adaptive width of the informative ring in task of control signal hidden transmission at multi–agent robotics system
Authors: Shumskaya O , Iskhakova A 
Published: November 2020

Abstract
In the paper the relevant scientific problem of development of new methods of data transmission in mobile robotic groups is considered. The originality is defined by rapid body height of distribution of group robotics in the solution of a wide range of tasks and at the same time lack of a methodological support for formation of the safe environment of data exchange between agents in such groups. The authors offer original approach and pilot signals transformation method with function of concealment of the fact of data transmission between agents of a diverse system. The technology of digital watermarks embedding into a video stream, which is transferred in interaction of agents, is applied. The results of computing and program experiments which show effectiveness of application of the offered methodical approach regarding counteraction to the attacks, distortions and other impacts on the transmitted data caused by the difficult conditions of an actuation medium are given in work. The results show applicability of the offered approach and the method in the solution of the put-forward scientific problem on creation of effective providing in the field of control of heterogeneous robots and robotic complexes and achievement of necessary reliability level and safety.
State of the art of consumer video surveillance standards in Russia and abroad
Authors: Stupina A A , Tynchenko S V , Kukartsev A V , Lobkov K Yu , Fedorova N V , Danilchenko Y V 
Published: November 2020

Abstract
In recent years, video surveillance technology has been developing. The use of video surveillance has spread from national and social welfare to everyday life, and a number of consumer-grade video surveillance products have been created. However, there is a problem where the domestic market is still in a non-standard stage. Consumer-grade video surveillance system does not have specific standards, which seriously affect the consumer awareness of the consumer-grade video surveillance products. This article presents a video surveillance system and reveals the standards of an existing video surveillance system.
Converting network–unlike data into complex networks: problems and prospective
Authors: Tikhomirov A A , Berestneva O G , Mokina E , Kinash N , Kuklina M , Trufanov A I , Rossodivita A , Kuklina V , Bilichenko I , Bogdanov V 
Published: November 2020

Abstract
Often network science with complex networks as its basic entity has attracted scientific societies with their diverse practical capacities. Some entities (objects, processes, and data) having their built-in web nature might be considered as networks seamlessly. Contrary, network mapping for Network –Unlike Data (NUD), i.e. images and time series, is extremely complicated and manifold, so that explorers face with a tough problem which converting algorithm they should apply. We put in central focus separating data properties in line with their scale diversity – in distance, time, and nature and suggested a three step algorithm (scale-based one) to map NUD into complex networks. The algorithm was applied to networkalize two types of geographic maps of Olkhon district, Baikal Natural Territory, Irkutsk region, Russian Federation. It was underlined that the algorithm models coarse-graining and area-like linking and forms thoroughly output structures of really complex topologies with intrinsic scale-free and small world properties. In addition to simple examples transformation of NUD into multiplex networks is considered as a promising approach to study more complex systems of the real world. Networkalization concerned challenges in extracting the pertinent information from huge data resources conveyed by a network imprint for each file is also discussed.
The generalized correlating function of capillary curves and the relationship of the filtration-capacitive parameters of reservoirs in Western Siberia with the size distribution of pore channels
Authors: Akhmetov R T , Mukhametshin V V , Kuleshova L S , Grezina O A , Malyshev P M 
Published: November 2020

Abstract
It was shown that the Leverett J-function and the Brooks-Corey correlating function approximate the capillary curves with insufficient accuracy and therefore do not allow us to obtain an analytical expression for the density distribution of pore channels by size. The polynomial approximation proposed makes it possible to sharply increase the reliability and accuracy of the capillary curves approximation. We obtained analytical expressions that allow to get a density distribution function of pore channels by size for known values of filtration-capacitive parameters (porosity, permeability, residual water saturation). It should be noted that the correlation between the distribution of the size of the pore channels and the porometric characteristics of the reservoir can be obtained according to the geophysical methods of well research.
Enhancing cryptographic stability of applications based on the principles of dynamic polymorphism
Authors: Avetisyan B R , Pokhomchikova E O , Daudov I M 
Published: November 2020

Abstract
Today, encryption reflects a high level of reliability and confidentiality when working with data, both within local networks and in the global Internet network. At present, data processing has become an integral part of society. It penetrates practically the whole sphere of human activity. There are negative consequences of the development of this area. Very achievements in the field of high-tech technologies are used everywhere and are very new.
Mathematical modeling of the flood control system components presented by low-head earth dams for the Lower Kuban agricultural lands
Authors: Bandurin M A , Vanzha V V , Shishkin A S , Litovka F S , Sidakov A A 
Published: November 2020

Abstract
The article discusses the main parameters of the application of modern methods of mathematical modeling by the finite element method, necessary to assess the technical condition of low-head earth dams and identify their defects that impact the flood control system for protecting the agricultural lands of the Lower Kuban. The problem is in substantiating the necessity to extend the life of the of low-head earth dams of the flood control system in the Lower Kuban that are in unsatisfactory state and require modernization and reconstruction. The long-term operation of the low-head earth dams of the flood control system demands identification of defects and damage that violate the normal operation of the flood control system of the Lower Kuban; many structural elements fail, the soil base subsides, as well as the reinforced concrete lining can be completely destroyed. The most widespread, when assessing the residual life of the flood control system of low-head earth dams, is an integrated accident risk assessment. Based on the surveys, the technical condition of the low-pressure earthen dams of the flood control system of the Kuban River, over a considerable length, is assessed as emergency. Over a long period of operation, significant damage and changes to the main structures of the low-head earth dams of the flood control system have occurred. In many areas, the structural elements of the dams are washed up and weakened, in some areas, the ridge of the dams was found to subside by 30-50 cm, sediment accumulation in the channel in some areas led to a sharp reduction of the open cross section area with a simultaneous increase in erosion processes, etc. As a result of numerical experiments of mathematical modeling by the finite element method, the reliability of the low-head earth dams of the flood control system for various combinations of destructive influences is estimated.
Construction of Liapunov functions for highly nonlinear dynamic systems with feedback
Authors: Annakulova G K 
Published: November 2020

Abstract
The paper provides stability and qualitative research of oscillations of a highly nonlinear dynamic system with feedback. For a system satisfying Liapunov theorem, definite-positive recurrent functions of order 1 with negative derivatives are constructed. Sufficient stability conditions are established for the considered cases of power nonlinearities. Surface diagrams of Liapunov functions and their derivatives are constructed for various values of the feedback parameter. Using the Liapunov criterion, the behavior of the trajectories of dynamic system on the state planes and near the singular points is investigated. Possible limit cycles are determined based on the Poincaré method of contact curves. Integral curves and phase trajectory diagrams are constructed numerically using the Mathcad 13 software package. A transition process from an unstable focus to self-oscillating and relaxation vibration modes is established, as well as the corresponding limit cycles consistent with analytical definition of rings containing the indicated limit cycles.
The cascade equivalent A-H-circuit of the salient-pole electric machine on the base of Laplace’s equation in dimensionless Cartesian coordinates
Authors: Blanc A V 
Published: November 2020

Abstract
For electromagnetic calculations of electric machines, the laminated models and the cascade equivalent circuits are often used. In the laminated model, each layer corresponds to the certain structural zone of the electric machine. Analyzing the solutions of the partial differential equations for each layer, we can conclude that these solutions may be reduced to the equations of the four-terminal circuit. Thereupon, the cascade equivalent circuit of the laminated model will be synthesized. In salient-pole machines, the solutions of partial differential equations are usually formed on the base of the piecewise continuous Sturm- Liouville eigenfunctions. Unfortunately, in this case, the cascade equivalent circuits cannot be synthesized since it needs many piecewise continuous functions in the zone of poles and many smooth functions in the zone of the air gap for ensuring the uniqueness of the solution. However, the author offers the approximate method on the base of the single piecewise continuous Sturm-Liouville eigenfunction in the zone of poles and many smooth functions in the zone of the air gap. This method allows synthesizing the cascade equivalent circuits of the salient-pole electric machines. In this paper, the synthesis of the cascade equivalent A-H-circuit of the synchronous salient-pole electric machine on the base of the Cartesian model is considered. In this model, the exciting field is generated with current sheets that are located on the rotor yoke The active cell corresponding the exciting field is synthesized by means of Laplace’s equation with the single piecewise continuous Sturm-Liouville eigenfunction.
Simulation the dynamics of hub-motors of an automatic guided vehicle in occurrence of planetary gear tooth defects
Authors: Bushuev D A , Karikov E B , Rubanov V G , Alekseevsky S V 
Published: November 2020

Abstract
The article discusses the process of studying the dynamics of hub-motor control systems mounted in an automatic guided vehicle (AGV), in the presence of breakage of the teeth of the ring gear of the planetary mechanism using virtual prototyping technologies. A model of a two-loop pulse modulated control system for the angular velocity of the Green E-Motion hub-motors as part of an AGV with a differential drive implemented in Matlab Simulink, with the integration of the mechanical part of the virtual prototype built in MSC Adams is described. The defect and backlash in the planetary gearbox of the hub-motors were modelled using 3D contact forces. Experimental test setup for the hub-motor virtual prototype validating is presented. As a result of co-simulation, the features of the hub-motors dynamics during the rectilinear movement of AGV in the occurrence of planetary gear tooth defects are revealed.
Mathematical modeling of the influence of defects in structures of an on-farm network of rice systems on their operational reliability
Authors: Bandurin M A , Solodunov A A 
Published: November 2020

Abstract
This article presents the results of mathematical modeling of the effects of defects in the structures of an on-farm network of rice systems over a long period of work on their operational reliability. This year marks the ninety years since the first rice system was built in 1929 in the Kuban. In the Krasnodar Territory, rice systems have been used that have been in continuous operation for more than thirty years. Therefore, it is necessary to scientifically substantiate the costs of maintenance and overhaul, and a numerical experiment was carried out on various defects in the structures of the on-farm network of rice systems. Based on field studies, mathematical modeling was performed for the most common defects by the ground- penetrating radar (GPR) sounding—a transverse crack crossing the drainage structure, as well as the destruction of the sides of the well. All calculations were performed on the SCAD Office calculation complex. In the course of mathematical modeling, it was found that the drainage pipeline with a well has a margin of operational reliability, which decreases over the years of use of the structure. In the formulation of mathematical modeling of a model of a drainage structure with a well without defects and damages, the aim was to establish the adequacy of the solid-state model of the stress-strain state at maximum water pressure with existing field tests under various boundary conditions. According to the data of the technical analysis of operational reliability, the operational reliability of the structures of the on-farm network of rice systems is determined and characterized. Provision of the operational reliability of rice systems is to carry out engineering, technical and land reclamation measures for sustainable and effective water conservation, rational use and development of the water management complex as a whole.