Journal of Electrical and power engineering最新文献

{"title":"Development of a model of current relay protection in the MATLAB/SIMULINK.","authors":"Hadai A.V.","doi":"10.31474/2074-2630-2022-1-29-38","DOIUrl":"https://doi.org/10.31474/2074-2630-2022-1-29-38","url":null,"abstract":"Based on MATLAB / SIMULINK, a model of a radial network with one-way power supply and three radial lines with a complex load at the end of each line is built. The model allows you to study the relationship of processes in the network in the case of normal operation, and in the case of possible damage at different distances from the power supply. The proposed model of the current protection device consists of a three-phase current meter, a switching element and a display. In the dialog box of the device, the primary current of the transformer current, the mains voltage frequency, the multiplicity of the protection tripping current and the tripping time multiplier are set, and the type of the standard curve of the protection tripping time characteristic is selected. A protection device with inverse time delay characteristics measures the RMS value of three-phase AC. The switch-off signal is given from the output of the relay protection device, depending on the time delay. The display shows the operating time of the device, primary and secondary currents and setpoint multiplicity. The performance of the device was evaluated by a three-phase short circuit. As a result of research it is established that the offered model of the relay protection device confirms correct behavior of the relay of the maximum current in various operating modes of a network. The behavior of the protection device indicates that the proposed model can be used in further work to develop algorithms for current protection of lines. To improve the model of the device, it is necessary to investigate the influence of simulation parameters, such as data on power sources, power lines, load and type of damage on the parameters of the protection device. The scientific novelty is the the developed models of the electric network and the device of the maximum current protection with all inverse characteristics of endurance of time provided by the ANSI / IEEE and IEC standards. The practical significance of the work is the possibility of using the model to test the selectivity and sensitivity of protection in the event of changes in network parameters in a wide range and in the case of research in the development and improvement of relay protection devices and training.","PeriodicalId":174144,"journal":{"name":"Journal of Electrical and power engineering","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125016568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geometrization of solar panel structures and its impact on the productivity of electricity production.","authors":"S. N.","doi":"10.31474/2074-2630-2022-1-6-10","DOIUrl":"https://doi.org/10.31474/2074-2630-2022-1-6-10","url":null,"abstract":". The current direction in the development of renewable energy today is the efficient use of the potential of solar energy. The construction of energy-efficient low-power autonomous solar power supply systems is a priority task, the solution of which will lead to energy independence of the consumer from the electricity market. Decentralization of energy supply is currently a global trend. Renewable energy is a solution to many problems of energy systems in an energy crisis. It is on renewable energy sources and autonomous power plants built on their basis that the future is. But their construction must meet a number of requirements, such as energy efficiency, performance, reliability, mobility and modularity. . The constructive issues of building photovoltaic plants are important and require an individual approach in each case, taking into account a variety of impact indicators. Therefore, it is very important to identify the optimal geometric design of an autonomous photogeneration system, which is the most energy efficient and productive in terms of generating electrical energy. The generation of electrical energy by solar power plants and, accordingly, the energy efficiency and performance of solar panels depends on many factors, but climatic and technical ones have the greatest influence. Since it is impossible to influence the change in climatic conditions, it is accordingly necessary to adapt to them in order to reduce their impact. Thus, one of the solutions is the location of solar panels at an optimal angle to directional solar radiation. From a technical point of view, the issue of adapting solar panels to climatic factors has been studied for a long time and has certain solutions. But constructive issues that also ensure the mobility and modularity of an autonomous solar installation, taking into account such parameters as the occupied area, the location of the components of the energy storage system, the conversion system and the control system, require further development. One of the solutions to these issues is the geometrization of the design of a solar power plant, making it in the form of a geometric figure with the location of all the necessary devices and systems in the middle of it. The paper considers solar power plants structurally made in the form of a cube and in the form of a cone. The theoretical review of the construction of solar power plants in the form of geometric structures allows us to conclude that each given design has such general advantages as a reduction in the area of placement, structural stability and modularity. But all the considered designs need further development in order to increase their efficiency and, accordingly, energy performance.","PeriodicalId":174144,"journal":{"name":"Journal of Electrical and power engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131349653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of available methods of protection of the power grid with alternative sources from pre-emergency and emergency situations.","authors":"O. D., K. O.","doi":"10.31474/2074-2630-2022-1-57-62","DOIUrl":"https://doi.org/10.31474/2074-2630-2022-1-57-62","url":null,"abstract":"When performing work [1], the system that controls the photovoltaic station and measures the parameters in it was considered. In particular, an interesting part is the shutdown of certain loads (asynchronous electric motors) at different values of the output power of the station. Factors in reducing this parameter can be caused not only by changes in external factors, such as changes in the level of solar insolation or changes in temperature or angle of the panels, but also electrical processes occurring in the network between leaving the photovoltaic plant and final consumption. In this experiment, these are asynchronous motors in the drive with frequency control. To ensure certain modes of photovoltaic, power plants and substations, they include devices and systems of control, monitoring and signaling, which is a separate part of the automated information management system. Control systems and devices have their advantages, for example, they are possible: - deploy and synchronize with the grid, as well as include parallel operation with power plant distribution generators; - turn on and off the elements of electrical systems; - to achieve switching in the electrical installation, regulating the operation of switches and disconnectors; - switch modes of operation in the electrical installation [2]. Therefore, the general system of diagnostics and monitoring of electrical networks to avoid accidents and pre-accidents is based on one topology, it includes three mandatory layers: - power management (top layer, which contains software, power quality control, etc.); - field level, where values measured from devices at the lower level are collected and converted from a non-electrical component (eg temperature values) to electrical for further transmission to the upper level; - level of sensors, here there is a direct measurement of the necessary values for their further processing at a higher level [3]. Power system management is reduced [4] to continuous control of parameters, which determines the modes of operation and sets the control effect on individual network elements through the use of special methods and technical electrical equipment. Forecasting of processes in the objects of control and monitoring, which makes early detection of potential damage to the elements, also allows you to generate warning messages about the possibility of an accident [3]. And this, in turn, will allow in case of violations to have enough time to conduct a detailed diagnosis and perform preventive measures that do not affect the object itself [4]. During such actions there is no emergency situation, and the localization of potential disturbances does not lead to sudden disturbances of the power grid [5].","PeriodicalId":174144,"journal":{"name":"Journal of Electrical and power engineering","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131386896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research of the impact of the introduction of neural networks in the energy sector of Ukraine.","authors":"S. S., K. O.","doi":"10.31474/2074-2630-2022-1-39-43","DOIUrl":"https://doi.org/10.31474/2074-2630-2022-1-39-43","url":null,"abstract":"A power plant converts energy from a non-electric form to an electric one. Depending on the energy conversion, power plants are classified as minerals, nuclear, solar, geothermal, hydroelectric, and so on. The main goal is to perform this transformation as best as possible. Criteria of safety, efficiency, reliability and affordability are taken into account as benchmarks. The station consists of several units that generate and work together to meet electricity needs. For a fossil fuel power plant, each unit consists of three main components: a boiler, a turbine and a generator. The complexity of the operation is due to the variability of the load and high efficiency required in a wide range of operations. The main difficulties for the management task then arise due to the strong link between process variables and process nonlinearity. The purpose of this article is to analyze and develop a proposal for the introduction of artificial intelligence in the power industry of Ukraine. To achieve this goal, we will offer the following tasks: - analyze existing systems for the use of artificial intelligence in industry; - develop proposals for the introduction of artificial intelligence in the electricity system of Ukraine. In this study, methods of statistical, factorial, historical, comparative, logical, economic-mathematical and systems analysis, the method of expert assessments were used, which allowed to formulate proposals for the introduction of artificial intelligence in the power industry. Artificial neural networks are the first step towards a fundamentally new system of information analysis. They are mathematical and computer models that simulate the work of biological neurons, ie a system of interacting processes, built on the principle of connecting nerve cells of the human brain. It should be noted that they differ from conventional machine algorithms in the ability to learn, memorize and reproduce images, determine patterns, memorize and analyze information and obtain results. Output signals that arrive at the next processor and continue to be converted. Thus, artificial neurons form networks and layers in which connections are created, restored, maintained and destroyed by special signals. With regard to artificial intelligence, there is no generally accepted definition of artificial intelligence, therefore, by artificial intelligence we mean a machine system capable of learning using objective knowledge and experience, to solve creative problems like the human brain and inventive tasks, not going through options, build strategies and apply abstract concepts. Digitalization and artificial intelligence are penetrating most sectors of the economy, including the electricity sector. The digitalization of energy requires the development and widespread use of end-to-end technologies, including industrial Internet, components of robotics, wireless communications, artificial intelligence and others. Thus, artificial intelligence technologies have","PeriodicalId":174144,"journal":{"name":"Journal of Electrical and power engineering","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124129370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical model for calculation of thermal conditions of oil transformers.","authors":"P. A. M., P. N. I., Y. S. M., P. K. A.","doi":"10.31474/2074-2630-2022-1-74-80","DOIUrl":"https://doi.org/10.31474/2074-2630-2022-1-74-80","url":null,"abstract":"When operating electrical equipment and designing, there is always a need to solve the heating problem and cool it, namely the most vulnerable structural element - winding insulation. Issues related to the calculation of thermal conditions are the least developed area of the industry to create modern electrical equipment. The methods they are solved have an error of more than 10%, which is unacceptable. Therefore, the development of methods for mathematical modeling of the thermal regime of oil transformers using Simulink is relevant. The authors carried out a comparative analysis of existing methods for calculating the thermal regime of oil transformers. Based on our study, we propose classifying these methods into four groups. It has been proved that these models are challenging to analyze and have an error of more than 10%. We offer a model of thermal processes in oil transformers. The scientific novelty of the model is that for the first time, the object-oriented software module of the Simulink environment of MATLAB was used to describe the thermal modes of operation of oil-filled transformers. The simulation process was visualized using an oscilloscope (Scope) and a plotting unit (XY Graph). The upper input port is used for argument values, and the lower input port is used for function values. The main results of the study: - the existing methods for calculating the thermal regime of oil transformers were analyzed - the system of Lawrence equations was solved by the methods of mathematical modeling. - based on the study of the behavior of a dynamic non-autonomous system using Simulink methods, a convention model applicable to the description of the thermal mode of operation of oil transformers and other modern electrical equipment was developed. The proposed model for calculating the thermal operating conditions of oil-filled transformers are characterized by functionality and the possibility of using the results and the model itself in the design of modern electrical equipment.","PeriodicalId":174144,"journal":{"name":"Journal of Electrical and power engineering","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129179366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"USE OF SOFTWARE FOR IMPROVING THE EFFICIENCY OF MODELING ENERGY NETWORKS","authors":"S. S., Danylchenko D.O., Kuznetsov D.S.","doi":"10.31474/2074-2630-2022-1-17-28","DOIUrl":"https://doi.org/10.31474/2074-2630-2022-1-17-28","url":null,"abstract":"The article is devoted to the topical issue of power grid modeling. The article discusses positive and negative features of simulation programs. Particular attention is paid to the principles of the programs. Such programs as PSS®SINCAL from Siemens; ETAP from Operation Technology and PowerFactory from DIgSILENT GmbH are considered in the article. The PSS®SINCAL software specializes in designing networks from low to ultra-high voltage classes, in symmetrical and non-symmetrical modes of operation, takes into account the installation possibilities of compensating devices and gives recommendations for their installation locations. Basic models enabling mode calculations and shortcircuit calculations as well as simulation of electromagnetic transients are used as the basis of the PSS®SINCAL software. The basic modules include steady state calculations, calculations of short circuit currents, harmonics, system stability and electromagnetic transients. Particular attention is paid to the optimization and planning module, namely reactive power optimization. The module of reactive power optimization in PSS®SINCAL offers methods of optimizing existing equipment by finding the best switching points for reactive power compensation. ETAP software specializes in electrical network and power transmission design. ETAP Grid™ connects network design with detailed substation models, SCADA systems, and real-time transmission network management. This paper covers only 2 modules of ETAP software, namely transmission and distribution modules. PowerFactory captures the full range of functionality from standard features to highly sophisticated and advanced applications, including wind power, distributed generation, real-time modeling, and performance monitoring for testing of surveillance systems. This article reviews only 2 modules of the PowerFactory software, namely the electrical power transmission and distribution modules. The paper reviews the programs and concludes that Siemens' PSS®SINCAL software would be the most successful solution for modeling electric grids and accounting for the effects of compensating devices on voltage levels in electric grids.","PeriodicalId":174144,"journal":{"name":"Journal of Electrical and power engineering","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124112584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The use of computer modeling of the electrical network in the implementation of measures to compensate for reactive power.","authors":"N. E.","doi":"10.31474/2074-2630-2022-1-44-50","DOIUrl":"https://doi.org/10.31474/2074-2630-2022-1-44-50","url":null,"abstract":"The article identified the place of electricity in the world market economy, noted the growing problem of lack of energy resources. The principles of reliable and uninterrupted power supply to consumers during a certain period of time are determined, the role of external factors on the quality of electricity supply is indicated. The paper notes that the main consumers of electricity are industrial facilities, whose technological processes are characterized by the presence of nonlinear loads, which leads to the emergence of transients that significantly affect the parameters of power supply systems, causing fluctuations in system parameters. In the presence of nonlinear consumers, their operation is able to produce reactive power in the network, which causes the circulation of power between the energy source and its consumers and leads to numerous negative phenomena - increased losses in conductive elements, the need for high power equipment, increasing cable and wire the emergence of harmonic fluctuations, increasing economic losses during operation. The paper reviews a wide range of literature sources devoted to the introduction of means and methods of reactive power compensation, determines the relevance of such studies. It has been proven that the variety of application conditions and the wide range of reactive power compensation devices require the use of modern computer software to study the operation of power systems. A model of the energy system was drawn up, which has the maximum approximation to the real scheme and contains loads of active-inductive nature. Based on the simulation results, graphical dependences were obtained, illustrating the nature of the change in maximum voltage and reactive energy production without and when applying reactive power compensation measures.","PeriodicalId":174144,"journal":{"name":"Journal of Electrical and power engineering","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130030682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of parameters of electrical networks by the method of simulation modeling in CAD.","authors":"S. D., D. L.","doi":"10.31474/2074-2630-2022-1-63-68","DOIUrl":"https://doi.org/10.31474/2074-2630-2022-1-63-68","url":null,"abstract":"The aim of the work is to increase the efficiency of design processes, provide computer support in operational decision-making in situations requiring rapid collection and synthesis of large amounts of data of different nature, conducting cumbersome computational estimates, including simulation computer modeling. The operation of the network is influenced by both determined, assumed factors and random factors due to changing weather conditions, failures of network equipment, various qualifications of specialists. A well-developed scientific arsenal of mathematical statistics can be used to study regularities, build mathematical models and make forecasts for different investment options. The method of processing experimental data in Excel spreadsheet for periods of trouble-free operation and repair of electrical networks, the method of transition from interval estimates of performance to smooth functions of the electrical network required for computer simulation of labor costs in a continuous time. The concrete example is considered and parameters of work of a city electric network are calculated. Analysis of the results of the calculations showed that the series of obtained probabilities are close to geometric progressions. The method of least squares for each variant of calculations selected such a geometric progression that the differences between the empirical and theoretical curves were minimal. Generalizations of results of calculations are made and requirements to the expert system automating collection of regional data and carrying out computer support of acceptance of administrative decisions are formulated.","PeriodicalId":174144,"journal":{"name":"Journal of Electrical and power engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133617368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fridges’ energy consumption management on the base of industrial internet of things technology","authors":"K. N., V. V.","doi":"10.31474/2074-2630-2022-1-51-56","DOIUrl":"https://doi.org/10.31474/2074-2630-2022-1-51-56","url":null,"abstract":"The solution of the actual scientific problem is offered: development of methods and models of reduction of the cost of the consumed electric power on the basis of introduction of system of technical monitoring through introduction of IIOT technology (Industrial Internet of Things). One of the ways of the management of energy consumption modes efficiency increasing is based on the construction of control models of refrigeration units, the initial parameters of which are: internal temperatures; outdoor temperatures; correction of operating modes due to the opening of doorways; the level of filling the refrigeration unit; temperature of freezers. The criterion and relevant model of reducing the costs for consumed electricity was developed. It takes into account a number of restrictions imposed by the technological process and the requirements for the quality of storage of products. Reducing of the costs can be achieved in accordance with the rates differentiated by zones of the day that require the transfer of energy consumption to the night and half-peak zones of the tariff, minimizing consumption in peak and halfpeak hours. Realization of this is possible due to change of temperature modes of fridges - more cooling in hours of low payments and endurance on the minimum temperatures in hours of the maximum payments for electric energy. Based on the proposed models and methods, algorithms for assessing energy efficiency and obtaining a short-term forecast of energy consumption for planning the volume of electricity procurement have been developed. The software developed by us allows to control energy consumption and temperature modes of refrigeration units. Full control is provided: indoor, outdoor and freezer temperatures; facts of opening doors and their duration; the level of filling of the refrigeration unit. Development of methods and models of reduction of the cost of the consumed electric power on the base of introduction of systems of technical monitoring is offered. Based on the proposed model and modern IIOT (Industrial Internet of Things) technology, computer programs have been created that use modern libraries for input, processing and presentation of information, allowing them to be integrated into modern production management systems.","PeriodicalId":174144,"journal":{"name":"Journal of Electrical and power engineering","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134396516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of power consumption of the electrotechnical complex of the water supply system.","authors":"Davydenko L.V.","doi":"10.31474/2074-2630-2022-1-11-16","DOIUrl":"https://doi.org/10.31474/2074-2630-2022-1-11-16","url":null,"abstract":"The article is devoted to solving the issue of energy consumption planning of complex energy technological complexes. The expediency of application of self-organization methods of models of complex systems for modeling of power consumption based on the principles of inductive modeling was substantiated. Power consumption modeling was performed using neural networks based on iterative algorithms of the group method of data handling. The use of GMDH neural networks provided automatic structural-parametric identification of the model. The search for the optimal structure of the model was performed in three classes of support functions of neural networks. As a result of the algorithm of synthesis of models, the set of models-candidates having optimum structure in its class was formed. The obtained models have high modeling quality and low forecast error. Complicating the structure of the neural network does not significantly improve the quality of modeling results. The selection of the best structure of the model was made from the standpoint of multicriteria selection using a morphometric approach. Previously, all the criteria were reduced to one type according to the function of the goal and the procedure of their normalization was performed. The best structure of the model was chosen taking into account the area of the figure formed by the normalized values of the selection criteria. The polynomial GMDH neural network of the first order was chosen as the power consumption model. Deviations of actual and model values of power consumption do not exceed 1%. The usage of GMDH neural networks as an algorithm for model synthesis, supplemented by multi-criteria selection of the best model structure, allowed making an unambiguous choice of the structure of the power consumption model, suitable for determining the energy baseline.","PeriodicalId":174144,"journal":{"name":"Journal of Electrical and power engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134050223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}