Ukrainian Metrological Journal最新文献_第9页

Analysis of the temperature component of the combined standard uncertainty of the refractive index according to the test data of the control system for meteorological parameters developed for the Lyptsi geodetic polygon 根据Lyptsi大地多边形气象参数控制系统的测试数据，分析了折射率组合标准不确定度的温度分量

IF 0.1

Ukrainian Metrological Journal Pub Date : 2021-12-30 DOI: 10.24027/2306-7039.4.2021.250411

P. Neyezhmakov, A. Prokopov, Tatiana Panasenko, A. Shloma

{"title":"Analysis of the temperature component of the combined standard uncertainty of the refractive index according to the test data of the control system for meteorological parameters developed for the Lyptsi geodetic polygon","authors":"P. Neyezhmakov, A. Prokopov, Tatiana Panasenko, A. Shloma","doi":"10.24027/2306-7039.4.2021.250411","DOIUrl":"https://doi.org/10.24027/2306-7039.4.2021.250411","url":null,"abstract":"The National Scientific Centre “Institute of Metrology” is actively involved in the implementation of a number of international projects under the EMPIR programme. One of such joint projects is the EMPIR 18SIB01 GeoMetre research project “Large-scale dimensional measurements for geodesy”. The overall goal of the project is to ensure traceability of length measurements – from the measurement standard of the unit of length to long distances typical for geodetic measurements. As a result of the project, it is necessary to provide length measurements of at least 5 km with an expanded uncertainty of no more than 1 mm. \u0000The main task of the NSC “Institute of Metrology” within this project is the development, research and practical implementation of methods and means of accounting for the influence of the earth’s atmosphere on the results of measurements of long distances in geodesy, carried out using electromagnetic waves in the optical range. \u0000When performing the section Task 1.4 of the project, new methods of highly accurate determination of the mean integral refractive index of air, used as a correction taking into account the influence of the atmosphere on the measurement results, are justified. Requirements for the accuracy of measurements of meteorological parameters at discrete points of the baseline are formulated, which are necessary to determine the mean integral refractive index. That is, the requirements for the metrological characteristics of temperature, pressure and humidity sensors are determined. \u0000The article discusses the results of the development, manufacture and testing of the sensors for temperature measurement. It is shown that the created sensors meet the requirements of the GeoMetre project.","PeriodicalId":40775,"journal":{"name":"Ukrainian Metrological Journal","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48570289","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}

引用次数: 0

Informational uncertainty of measuring instruments 测量仪器的信息不确定度

IF 0.1

Ukrainian Metrological Journal Pub Date : 2021-12-30 DOI: 10.24027/2306-7039.4.2021.250399

Gennadii Manko, Elena Titova

{"title":"Informational uncertainty of measuring instruments","authors":"Gennadii Manko, Elena Titova","doi":"10.24027/2306-7039.4.2021.250399","DOIUrl":"https://doi.org/10.24027/2306-7039.4.2021.250399","url":null,"abstract":"Recently, there has been a revival of interest in the use of the information approach in the theory of measurements. Unlike the traditional approach, information theory does not evaluate error or uncertainty, but entropy and the amount of information. This article analyzes a number of recent publications that develop ideas for the information approach. The limitations and disadvantages of both the entropy approach and the concept of uncertainty are indicated. As a compromise solution, it is proposed to use a criterion based on the Bongard’s uncertainty and useful information. The concept of information uncertainty is proposed, which is estimated by the amount of negative useful information, that is, misinformation introduced by the measuring instrument. Some methods for calculating information uncertainty are described. \u0000The problems of using the uncertainty approach are noted. This approach does not imply the use of such a generalized characteristic of measuring instruments as an accuracy class. The article proposes an analogue of the accuracy class in the form of relative informational uncertainty, expressed as a percentage. This will make it possible to evaluate the quality of the measuring instrument by a single parameter, the calculation of which requires a minimum of computational operations.","PeriodicalId":40775,"journal":{"name":"Ukrainian Metrological Journal","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68826998","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}

引用次数: 0

Investigation of photobiological safety of blue light of LED image projector of household use 家用LED图像投影仪蓝光的光生物安全性研究

IF 0.1

Ukrainian Metrological Journal Pub Date : 2021-10-05 DOI: 10.24027/2306-7039.3.2021.241285

Oleksandr Pitiakov, P. Neyezhmakov, S. Shpak, Svitlana Kyslytsia, G. Kozhushko

{"title":"Investigation of photobiological safety of blue light of LED image projector of household use","authors":"Oleksandr Pitiakov, P. Neyezhmakov, S. Shpak, Svitlana Kyslytsia, G. Kozhushko","doi":"10.24027/2306-7039.3.2021.241285","DOIUrl":"https://doi.org/10.24027/2306-7039.3.2021.241285","url":null,"abstract":"Abstract \u0000Light emitted in the wavelength range of 400–500 nm causes a very significant photochemical effect on the retina. At certain doses of blue light energy can cause damage to the retina, so the study of the safety of blue light projectors used in domestic conditions is an urgent task. The aim of this work is to study the photobiological safety of light image projectors with light emitting diodes. The paper analyzes the requirements for photobiological safety of tube systems and methods for assessing the danger of blue light of projectors that use LED light sources. The information is provided on the equipment for measurement of spectroradiometric and photometric parameters of beams of projectors, as well as features of radiance and irradiance measurement of lamp systems in which lens optics is used. \u0000The results of research of photobiological danger levels of blue light of image projectors intended for use in household conditions are presented. It is shown that at a distance of 1 m from the projector (the distance for which the level of photobiological safety of blue light is normalized), the investigated type of projector belongs to the risk group RG1 (insignificant risk). When the distance is reduced to 0.5 m and 0.2 m, the risk of blue light increases to the RG2 group (medium risk). \u0000The features of the requirements for photobiological safety of blue light of image projectors used in everyday life, educational institutions and in other conditions are analyzed. In particular, the risk group at a distance of 1 m from the collimator lens should not exceed RG1, and it is recommended to put an additional label on the projector indicating the risk group RG1 and mark this information in the user manual. \u0000Conclusions are made on the compliance of the studied low-power image projectors with the safety conditions of blue light, established by the international standard IEC 62471-5 (Photobiological Safety of Lamps and Lamp Systems – Part 5 Image Projectors).","PeriodicalId":40775,"journal":{"name":"Ukrainian Metrological Journal","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46355118","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}

引用次数: 0

Development, research and optimization of weight measuring system 称重系统的开发、研究与优化

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Ukrainian Metrological Journal Pub Date : 2021-10-05 DOI: 10.24027/2306-7039.3.2021.241640

N. Koshevoy, G. Cherepashchuk, Yevhen Kalashnikov, O. Zabolotnyi, Vitalii P. Siroklyn

{"title":"Development, research and optimization of weight measuring system","authors":"N. Koshevoy, G. Cherepashchuk, Yevhen Kalashnikov, O. Zabolotnyi, Vitalii P. Siroklyn","doi":"10.24027/2306-7039.3.2021.241640","DOIUrl":"https://doi.org/10.24027/2306-7039.3.2021.241640","url":null,"abstract":"The main task of the research is to improve technical and economic indicators of weight measuring system and to increase the efficiency of its research on the basis of cost-optimal planning of experiments. \u0000A system with a measuring tray has been developed, and it is different from existing systems with a possibility to control inclination angle of a tray, moisture content and temperature of a bulk substance, what provides better accuracy of mass measurement. \u0000The researches of weight measuring system were performed using the following methods of cost-optimal experiment planning: taboo search, particle swarm method, exhaustive search, Gray code based method. It gave possibility to reduce cost of implementing the experiment. \u0000To perform the research of weight measuring system, a plan of a full-factor experiment was selected, which was optimized for the cost of its implementation by using a method based on the Gray code. \u0000In the result of research, mathematical models in coded and natural values of factors were obtained. They characterize the dependence of the measurement acceptable error on such indicators as the angle of the measuring tray, the humidity of the bulk material, the coefficient of friction of the bulk material in motion. Using a mathematical model, rational values of the design parameters of the weight measuring system were obtained, which provide high accuracy (measurement acceptable error does not exceed 0.20%): the angle of the weight measuring tray α = 41.9°; humidity of loose material W = 14%; the coefficient of friction of the bulk material in motion fd = 0.70. \u0000The developed weight measuring system can be widely used for dosing of bulk materials in various technological productions.","PeriodicalId":40775,"journal":{"name":"Ukrainian Metrological Journal","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68826982","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}

引用次数: 1

Comparative research of quality indicators of measuring instruments: practical aspects 测量仪器质量指标的比较研究:实用方面

IF 0.1

Ukrainian Metrological Journal Pub Date : 2021-10-05 DOI: 10.24027/2306-7039.3.2021.241620

O. Velychko, T. Gordiyenko

{"title":"Comparative research of quality indicators of measuring instruments: practical aspects","authors":"O. Velychko, T. Gordiyenko","doi":"10.24027/2306-7039.3.2021.241620","DOIUrl":"https://doi.org/10.24027/2306-7039.3.2021.241620","url":null,"abstract":"The main purpose of modern measuring instrument MI is to perform accurate and reliable measurements in order to obtain complete and reliable measurement information. The MI must be of proper quality, which must be reliably assessed. For technical means, traditional quality indicators have been established, some of which are common to MI. The metrological characteristic is unique to a MI and can be considered one of the most important of MI indicators. \u0000The quality of MI is characterized by a certain system of quality indicators. Depending on MI group, the system of quality indicators can differ. The target indicators are specific for each type of product. These indicators require additional analysis. The main metrological characteristics should be referred to the target indicators of MI. For some MI categories, additional indicators can be established, and for others, they are excluded. \u0000The methodology of evaluation of MI quality indicators and algorithm of its realization are offered. The digital multimeters as category of MI have been selected for practical comparative evaluation of MI quality indicators. The ten indicators for this category of MI have been refined. Comparative expert evaluation of quality indicators of 12 multimeters was carried out with the involvement of a group of 34 metrology experts. The weight of each of the 10 selected MI quality indicators was determined. The results of expert evaluation of multimeter are presented.","PeriodicalId":40775,"journal":{"name":"Ukrainian Metrological Journal","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44967337","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}

引用次数: 0

Optimal data processing in the ballistic laser gravimeter under the effect of correlated interference 相关干涉作用下弹道激光重力仪数据的优化处理

IF 0.1

Ukrainian Metrological Journal Pub Date : 2021-10-05 DOI: 10.24027/2306-7039.3.2021.241522

Anatolii Omelchenko, O. Vinnichenko, P. Neyezhmakov, Oleksii Fedorov, V. Bolyuh

{"title":"Optimal data processing in the ballistic laser gravimeter under the effect of correlated interference","authors":"Anatolii Omelchenko, O. Vinnichenko, P. Neyezhmakov, Oleksii Fedorov, V. Bolyuh","doi":"10.24027/2306-7039.3.2021.241522","DOIUrl":"https://doi.org/10.24027/2306-7039.3.2021.241522","url":null,"abstract":"Abstract \u0000In order to develop optimal data processing algorithms in ballistic laser gravimeters under the effect of correlated interference, the method of generalized least squares is applied. In this case, to describe the interference, a mathematical model of the autoregression process is used, for which the inverse correlation matrix has a band type and is expressed through the values of the autoregression coefficients. To convert the “path-time” data from the output of the coincidence circuit of ballistic laser gravimeters to a process uniform in time, their local quadratic interpolation is used. \u0000Algorithms for data processing in a ballistic gravimeter, developed on the basis of a method of weighted least squares using orthogonal Hahn polynomials, are considered. To implement a symmetric measurement method, the symmetric Hahn polynomials, characterized by one parameter, are used. \u0000The method of mathematical modelling is used to study the gain in the accuracy of measuring the gravitational acceleration by the synthesized algorithms in comparison with the algorithm based on the method of least squares. It is shown that auto seismic interference in ballistic laser gravimeters with a symmetric measurement method can be significantly reduced by using a mathematical model of the second-order autoregressive process in the method of generalized least squares. A comparative analysis of the characteristics of the algorithms developed using the method of generalized least squares, the method of weighted least squares and the method of ordinary least squares is carried out.","PeriodicalId":40775,"journal":{"name":"Ukrainian Metrological Journal","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42569209","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}

引用次数: 0

Research of metrological capabilities of digital (DDS- and Trueform-) generators 数字(DDS-和Trueform-)发生器计量性能的研究

IF 0.1

Ukrainian Metrological Journal Pub Date : 2021-10-05 DOI: 10.24027/2306-7039.3.2021.241500

Y. Pavlenko, S. Kirienko, V. Ogar, Olena Vаsileva

{"title":"Research of metrological capabilities of digital (DDS- and Trueform-) generators","authors":"Y. Pavlenko, S. Kirienko, V. Ogar, Olena Vаsileva","doi":"10.24027/2306-7039.3.2021.241500","DOIUrl":"https://doi.org/10.24027/2306-7039.3.2021.241500","url":null,"abstract":"Abstract \u0000One of the fundamental improvements of the measurement standard of frequency deviation of frequency-modulated oscillations was the replacement of analog frequency-modulated generators used in DETU 09-03-95 with digital ones based on the principle of direct digital synthesis (DDS) and its next version of Trueform technology. These generators have wider ranges of frequency deviation and modulation frequencies than analog ones, but nonlinear distortion laws of the frequency modulation are not standardized. \u0000The subject of the article is the development of methods and research of these generators and frequency-modulated signals generated by them for nonlinear distortions, accompanying amplitude modulation, frequency noise. Three methods were used in the study: direct measurement; “combination frequencies” and “frequency shift”. The experiment was performed using several measurement methods, which allowed to estimate very small values of nonlinear distortion. Methods were developed and experimental estimations of concomitant amplitude modulation of DDS-generators (in frequency modulation mode), as well as their frequency noise level, were performed. An experimental evaluation of the capabilities of the analog-digital demodulator of the R&S FSL6 spectrum analyzer with the K7 option was performed, its high linearity was shown, its capabilities with respect to the frequency ranges of carrier oscillations and frequency deviation were evaluated. The research results provide a basis for the method of calibration of DDS-generators and demodulator of spectrum analyzers with the K7 option in those ranges where their parameters are not normalized (at direct current up to 8 MHz and F up to 500 kHz).","PeriodicalId":40775,"journal":{"name":"Ukrainian Metrological Journal","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44825708","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}

引用次数: 0

Metrological support of maintenance by the technical state of communication means 通过通信手段的技术状态为维护提供计量支持

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Ukrainian Metrological Journal Pub Date : 2021-10-05 DOI: 10.24027/2306-7039.3.2021.241573

Yu. Myroshnychenko

{"title":"Metrological support of maintenance by the technical state of communication means","authors":"Yu. Myroshnychenko","doi":"10.24027/2306-7039.3.2021.241573","DOIUrl":"https://doi.org/10.24027/2306-7039.3.2021.241573","url":null,"abstract":"Modern and prospective communication means are among the most knowledge-driven, high-tech types of industrial products, which are subject to enhanced requirements for quality and efficiency of application. The effective functioning of modern communication means is provided by built-in software, including metrological support. In this paper, we consider the specifics of metrological maintenance of large-scale communication facilities (tens and hundreds of thousands of elements) consisting of separate subunits, the serviceability, maintenance, and recovery of which can be performed autonomously. It is proposed to enhance the efficiency of the by-state-maintenance (also called maintenance by the technical state) by accounting for the specifics of metrological support, establishing an optimal sequence of operations, selecting the measuring instruments in accordance with relevant requirements. To do this, one has to use a combined indicator composed of individual parameters of the tests and the probability of their preferred choice. This allows to assess the technical condition of the communication means with a given probability during a minimal time. In addition, one can estimate the time of maintenance, taking into account the metrological reliability and the probability of correct evaluation of the result of checking the parameters by the measuring instruments. The order of implementation of the obtained results is formalized in the form of an algorithm and an example of their realization is presented.","PeriodicalId":40775,"journal":{"name":"Ukrainian Metrological Journal","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43234299","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}

引用次数: 2

Automated system for identification of data distribution laws by analysis of histogram proximity with sample reduction 用样本约简法分析直方图接近性来识别数据分布规律的自动化系统

IF 0.1

Ukrainian Metrological Journal Pub Date : 2021-10-05 DOI: 10.24027/2306-7039.3.2021.241627

Olha Oliynyk, Y. Taranenko

{"title":"Automated system for identification of data distribution laws by analysis of histogram proximity with sample reduction","authors":"Olha Oliynyk, Y. Taranenko","doi":"10.24027/2306-7039.3.2021.241627","DOIUrl":"https://doi.org/10.24027/2306-7039.3.2021.241627","url":null,"abstract":"The error in the identification of the distribution law entails an incorrect assessment of other characteristics (standard deviation, kurtosis, antikurtosis, etc.). The article is devoted to the development of accessible and simple software products for solving problems of identifying distribution laws and determining the optimal size of a data sample. \u0000The paper describes a modified method for identifying the law of data distribution by visual analysis of the proximity of histograms with a reduction in the sample size with software implementation. The method allows choosing the most probable distribution law from a wide base of the set. The essence of the method consists in calculating the entropy coefficient and absolute entropy error for the initial and half data sample, determining the optimal method for processing the histogram using visual analysis of the proximity of histograms, and identifying the data distribution law. The experimental data processing model makes it possible to take into account the statistical properties of real data and can be applied to various arrays, and allows to reduce the sample size required for analysis. \u0000An automated system for identifying the laws of data distribution with a simple and intuitive interface has been developed. The results of the study on real data indicate an increase in the reliability of the identification of the data distribution law.","PeriodicalId":40775,"journal":{"name":"Ukrainian Metrological Journal","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47595206","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}

引用次数: 0

Level gauges. Application features 水平指标。应用程序功能

IF 0.1

Ukrainian Metrological Journal Pub Date : 2021-10-05 DOI: 10.24027/2306-7039.3.2021.241633

Gennadiy Narodnytskyi, Evgeniy Suhomlinov, Svitlana Tiupa, O. Marchenko

{"title":"Level gauges. Application features","authors":"Gennadiy Narodnytskyi, Evgeniy Suhomlinov, Svitlana Tiupa, O. Marchenko","doi":"10.24027/2306-7039.3.2021.241633","DOIUrl":"https://doi.org/10.24027/2306-7039.3.2021.241633","url":null,"abstract":"This paper considers various aspects of application of the most common types of level gauges – magnetostrictive, servo-driven, radar and reflex. Much attention is paid to accuracy of level gauges, expressed in error and uncertainty, including those referred to the legally regulated measuring instruments. Due to the fact that the most of the level gauges are installed on tanks, the requirements for them, given in the standards, and possible ways to improve the accuracy of level gauges installed on tanks have been analyzed. Methods of verification and calibration of level gauges are considered, including both verification on standard units using water, and carried out by the simulation method. \u0000The requirements for the metrological control of level gauges with moving parts are stated. It is shown that for verification of such level gauges, it is necessary to carry out measurements when the water moves both up and down. However, there is no need to take measurements, as in determining the variation, at the same points when the water moves up and when the water moves down. \u0000Some known caution is needed when using the results of the verification of level gauges by the simulation method. Especially big differences in the results of verification on the standard unit with water and the simulation method are observed for magnetostrictive level gauges. \u0000This difference is due to the fact that in these level gauges, the float slides along the pipe with a certain friction, and in the simulation method, the float moves by hand and its movement does not depend on friction.","PeriodicalId":40775,"journal":{"name":"Ukrainian Metrological Journal","volume":null,"pages":null},"PeriodicalIF":0.1,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47542863","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}

引用次数: 0