Pub Date : 2022-12-29DOI: 10.18303/2619-1563-2022-2-44
D. A. Bukhtiyarov, V. Glinskikh
The background for creating an electromagnetic soil sounding apparatus with receiving and transmitting antennas separated by a distance of up to 100 meters is considered in this paper. The temperature and frequency dependences of the complex dielectric permittivity of multilayer clay soil are studied in conjunction with the results of numerical simulation of ultra-wideband log-periodic antennas immersed in the soil to a depth of 1.5 m. The choice of a high-voltage generator and pulse receiver is studied, and a structure of apparatus prototype is given. Based on the results of oscillograms’ and signal spectra measurements with 30 m antennas separation, and with reference to the soil temperature, estimates of the possible limits of change in the electrophysical parameters of the clay soil at a geophysical site are provided. Conclusions are drawn about ways to improve the apparatus in order to create a new technology for transient electromagnetic monitoring of permafrost.
{"title":"Preliminary results of clay soils state monitoring using transient electromagnetic sounding apparatus","authors":"D. A. Bukhtiyarov, V. Glinskikh","doi":"10.18303/2619-1563-2022-2-44","DOIUrl":"https://doi.org/10.18303/2619-1563-2022-2-44","url":null,"abstract":"The background for creating an electromagnetic soil sounding apparatus with receiving and transmitting antennas separated by a distance of up to 100 meters is considered in this paper. The temperature and frequency dependences of the complex dielectric permittivity of multilayer clay soil are studied in conjunction with the results of numerical simulation of ultra-wideband log-periodic antennas immersed in the soil to a depth of 1.5 m. The choice of a high-voltage generator and pulse receiver is studied, and a structure of apparatus prototype is given. Based on the results of oscillograms’ and signal spectra measurements with 30 m antennas separation, and with reference to the soil temperature, estimates of the possible limits of change in the electrophysical parameters of the clay soil at a geophysical site are provided. Conclusions are drawn about ways to improve the apparatus in order to create a new technology for transient electromagnetic monitoring of permafrost.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125808251","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}
Pub Date : 2022-12-29DOI: 10.18303/2619-1563-2022-2-65
A. Rzabekova, S. Abramenkov, A. Jakovlev, I. Koulakov
Time-frequency analysis of 40-hour seismic records of the temporary seismological network, performed using a systematic visual inspection of seismograms, spectrograms, and signal spectra in small time windows (from 30 s to 10 min), made it possible to identify several manifestations of volcanic seismicity in the Mutnovsky fumarole field area, as well as some non-volcanic signals. The former includes signals interpreted as a volcano-tectonic earthquake (only a single event was found), multiple swarms of hybrid and long-period earthquakes, as well as a stable (constant for 40 hours) microseismic signal likely related to the gas-hydrothermal activity of fumarole fields in the northeastern crater of the volcano. For specific stations of the network, the differences between simultaneously recorded signals were considered, an assessment was made of the influence of natural factors characteristic of the study area: hydrogeological and meteorological.
{"title":"Microseismicity spectral features analysis of the Mutnovsky volcano fumarole fields area","authors":"A. Rzabekova, S. Abramenkov, A. Jakovlev, I. Koulakov","doi":"10.18303/2619-1563-2022-2-65","DOIUrl":"https://doi.org/10.18303/2619-1563-2022-2-65","url":null,"abstract":"Time-frequency analysis of 40-hour seismic records of the temporary seismological network, performed using a systematic visual inspection of seismograms, spectrograms, and signal spectra in small time windows (from 30 s to 10 min), made it possible to identify several manifestations of volcanic seismicity in the Mutnovsky fumarole field area, as well as some non-volcanic signals. The former includes signals interpreted as a volcano-tectonic earthquake (only a single event was found), multiple swarms of hybrid and long-period earthquakes, as well as a stable (constant for 40 hours) microseismic signal likely related to the gas-hydrothermal activity of fumarole fields in the northeastern crater of the volcano. For specific stations of the network, the differences between simultaneously recorded signals were considered, an assessment was made of the influence of natural factors characteristic of the study area: hydrogeological and meteorological.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"100 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120813348","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}
Pub Date : 2022-12-29DOI: 10.18303/2619-1563-2022-2-118
Ya.K. Leopold, N. Kozhevnikov, E. Antonov
TEM survey under objects that containing superparamagnetic particles, the effects of magnetic viscosity can have a significant impact on the received signal. At present, such effects of magnetic viscosity are considered a nuisance, while some researchers point out that they contain useful information.The article presents a mathematical modeling of impulse response of viscous remanent magnetization. Using the lognormal particle distribution model, various impulse responses of the magnetization were modeled. The results of attempts to restore the distribution parameters and of model impulse responses are presented. An estimate of the effectiveness of the inversion of synthetic impulse responses is given.
{"title":"Mathematical modeling of impulse response of viscous remanent magnetization","authors":"Ya.K. Leopold, N. Kozhevnikov, E. Antonov","doi":"10.18303/2619-1563-2022-2-118","DOIUrl":"https://doi.org/10.18303/2619-1563-2022-2-118","url":null,"abstract":"TEM survey under objects that containing superparamagnetic particles, the effects of magnetic viscosity can have a significant impact on the received signal. At present, such effects of magnetic viscosity are considered a nuisance, while some researchers point out that they contain useful information.The article presents a mathematical modeling of impulse response of viscous remanent magnetization. Using the lognormal particle distribution model, various impulse responses of the magnetization were modeled. The results of attempts to restore the distribution parameters and of model impulse responses are presented. An estimate of the effectiveness of the inversion of synthetic impulse responses is given.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126546689","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}
Pub Date : 2022-12-29DOI: 10.18303/2619-1563-2022-2-15
M. Nikitenko
The paper presents a new data inversion technique for the transient electromagnetic method (TEM) by converting the measured signals into the frequency domain. The inversion involves a search for such earth model parameters that there is a consistency between the synthetic and field data. We use an optimization method, where through numerical simulation at each iteration the synthetic data are determined in accordance with the changing model parameters. Numerical simulation of TEM signals is a computationally expensive procedure, since the time-domain signal is usually calculated via the inverse Fourier transform of the frequency signal. Consequently, compared to the frequency signal, the time needed to calculate the time signal increases hundreds of times. It is proposed to transform the measured signals into the frequency domain and perform inversion therein, which significantly reduces the time expenditures. Transition into the frequency domain by the Fourier transform includes the extraction of the primary field from the signal, calculated by means of a special algorithm. This fact makes it possible to employ for the transformation a relatively small time interval actually used in TEM instead of an infinite one.
{"title":"Tem signal transformations to frequency domain for fast data inversion","authors":"M. Nikitenko","doi":"10.18303/2619-1563-2022-2-15","DOIUrl":"https://doi.org/10.18303/2619-1563-2022-2-15","url":null,"abstract":"The paper presents a new data inversion technique for the transient electromagnetic method (TEM) by converting the measured signals into the frequency domain. The inversion involves a search for such earth model parameters that there is a consistency between the synthetic and field data. We use an optimization method, where through numerical simulation at each iteration the synthetic data are determined in accordance with the changing model parameters. Numerical simulation of TEM signals is a computationally expensive procedure, since the time-domain signal is usually calculated via the inverse Fourier transform of the frequency signal. Consequently, compared to the frequency signal, the time needed to calculate the time signal increases hundreds of times. It is proposed to transform the measured signals into the frequency domain and perform inversion therein, which significantly reduces the time expenditures. Transition into the frequency domain by the Fourier transform includes the extraction of the primary field from the signal, calculated by means of a special algorithm. This fact makes it possible to employ for the transformation a relatively small time interval actually used in TEM instead of an infinite one.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134608420","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}
Pub Date : 2022-12-29DOI: 10.18303/2619-1563-2022-2-107
T. A. Petrochenko, A. Y. Zadoev, A. A. Duchkov, G. M. Mitrofanov
In this paper, we consider an example of obtaining data similar to seismic surveys in the process of conducting physical modeling. It is shown that the features of the data are close to those observed in a real experiment. This is proof of the possibility of testing the processing methods used in the practice of seismic exploration on the data of laboratory modeling of seismic surveys. In particular, the application of a certain set of processing procedures for the considered data related to the simulated environmental object showed that the resulting time sections contain all the inherent structural features of the model.
{"title":"Testing processing algorithms for seismic data from laboratory modeling","authors":"T. A. Petrochenko, A. Y. Zadoev, A. A. Duchkov, G. M. Mitrofanov","doi":"10.18303/2619-1563-2022-2-107","DOIUrl":"https://doi.org/10.18303/2619-1563-2022-2-107","url":null,"abstract":"In this paper, we consider an example of obtaining data similar to seismic surveys in the process of conducting physical modeling. It is shown that the features of the data are close to those observed in a real experiment. This is proof of the possibility of testing the processing methods used in the practice of seismic exploration on the data of laboratory modeling of seismic surveys. In particular, the application of a certain set of processing procedures for the considered data related to the simulated environmental object showed that the resulting time sections contain all the inherent structural features of the model.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130042300","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}
Pub Date : 2022-12-29DOI: 10.18303/2619-1563-2022-2-30
A. Glinskikh, O. Nechaev
Among a large number of geophysical well logging methods, the spontaneous potential (SP) logging is a most demanded one for studying geological sections, and is widely used in all drilled wells. This paper presents a brief review of the main studies on the enhancement of a theoretical model for the SP phenomenon, and on the creation of algorithms for numerical modeling of SP logging data. First of all, we discuss the studies that were conducted shortly after the discovery of the phenomenon and became fundamental in the field of SP method theory. Most of the first works were aimed at identifying the key factors that influence the shape and amplitude of SP signals. The research vector of these works contributed to the creation of interpretation charts, which are widely used even today. This review also analyses the main results of the more recent theoretical works aimed at developing a quantitative SP logging model that takes into account the petrophysical properties of the geological environment, and works related to numerical approaches for the modeling of well logging data. In addition, to demonstrate the effectiveness of modern computational methods, the paper presents an original algorithm based on the finite element method and utilizing a correct physical and mathematical model of the SP phenomenon. The proposed approach makes it possible to calculate SP signals in the intervals of clayed reservoirs, with consideration to their porosity, water saturation, as well as the type and content of clay minerals. Comparison of the SP modeling results and field logging data obtained from wells in Western Siberian fields shows a high quality of our theoretical model. The presented review of key works devoted to the theoretical description of the SP method, as well as modern numerical approaches for analysing SP logging curves in complex geological conditions, demonstrates the potential of the SP method for new areas of practical application.
{"title":"Development of physical and mathematical models of spontaneous polarization potentials for oil and gas well logging","authors":"A. Glinskikh, O. Nechaev","doi":"10.18303/2619-1563-2022-2-30","DOIUrl":"https://doi.org/10.18303/2619-1563-2022-2-30","url":null,"abstract":"Among a large number of geophysical well logging methods, the spontaneous potential (SP) logging is a most demanded one for studying geological sections, and is widely used in all drilled wells. This paper presents a brief review of the main studies on the enhancement of a theoretical model for the SP phenomenon, and on the creation of algorithms for numerical modeling of SP logging data. First of all, we discuss the studies that were conducted shortly after the discovery of the phenomenon and became fundamental in the field of SP method theory. Most of the first works were aimed at identifying the key factors that influence the shape and amplitude of SP signals. The research vector of these works contributed to the creation of interpretation charts, which are widely used even today. This review also analyses the main results of the more recent theoretical works aimed at developing a quantitative SP logging model that takes into account the petrophysical properties of the geological environment, and works related to numerical approaches for the modeling of well logging data. In addition, to demonstrate the effectiveness of modern computational methods, the paper presents an original algorithm based on the finite element method and utilizing a correct physical and mathematical model of the SP phenomenon. The proposed approach makes it possible to calculate SP signals in the intervals of clayed reservoirs, with consideration to their porosity, water saturation, as well as the type and content of clay minerals. Comparison of the SP modeling results and field logging data obtained from wells in Western Siberian fields shows a high quality of our theoretical model. The presented review of key works devoted to the theoretical description of the SP method, as well as modern numerical approaches for analysing SP logging curves in complex geological conditions, demonstrates the potential of the SP method for new areas of practical application.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128937292","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}
Pub Date : 2022-12-29DOI: 10.18303/2619-1563-2022-2-4
A. Tataurova, Y. Stefanov
Within the framework of the elastoplastic model, the development of irreversible deformation during horizontal compression of a sedimentary layer lying on a rigid foundation is considered. The influence of strength parameters of the medium and friction in the base on the configuration of plasticity zones and localization of deformation has been studied. Analytical estimates are made of the depths at which irreversible deformation develops, as well as their changes as a result of an increase in horizontal stresses. With the help of numerical simulation, the features of the origin and development of localized shear bands are shown. Schemes are constructed illustrating the nature of the development of localization bands depending on the properties of the medium.
{"title":"Development of irreversible deformation and localized shear bands under horizontal compression of the sedimentary layer","authors":"A. Tataurova, Y. Stefanov","doi":"10.18303/2619-1563-2022-2-4","DOIUrl":"https://doi.org/10.18303/2619-1563-2022-2-4","url":null,"abstract":"Within the framework of the elastoplastic model, the development of irreversible deformation during horizontal compression of a sedimentary layer lying on a rigid foundation is considered. The influence of strength parameters of the medium and friction in the base on the configuration of plasticity zones and localization of deformation has been studied. Analytical estimates are made of the depths at which irreversible deformation develops, as well as their changes as a result of an increase in horizontal stresses. With the help of numerical simulation, the features of the origin and development of localized shear bands are shown. Schemes are constructed illustrating the nature of the development of localization bands depending on the properties of the medium.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127755298","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}
Pub Date : 2022-12-14DOI: 10.18303/2619-1563-2022-1-49
M. Denisov, A. A. Zykov
An algorithm for separating a vibroseis signal from its harmonics implies preliminary prediction of harmonics with their subsequent adaptive subtraction from the correlogram. To obtain the adaptation filter estimates, a statistical criterion is used that minimizes the energy of the subtraction result. The amplitudes of the signals in a seismic trace decay due to geometrical spreading, which leads to statistical inhomogeneity in the objective formed. Therefore, an increase in the statistical reliability of estimation should be associated with an increase in signal amplitudes at large recording times. On the other hand, the source records always contain additive noise, and the signal-to-noise ratio decreases at longer times. In order to provide a compromise between the growth of signal amplitudes and maintaining a satisfactory signal-to-noise ratio in the operator adjusting gate, self-tuning weighting functions are included into the objective. A method for modifying the objective is proposed, which enables increased performance of the algorithm.
{"title":"Improvement of the algorithm for adaptive separation of the vibroseis signal from its harmonics in case of strong additive noise","authors":"M. Denisov, A. A. Zykov","doi":"10.18303/2619-1563-2022-1-49","DOIUrl":"https://doi.org/10.18303/2619-1563-2022-1-49","url":null,"abstract":"An algorithm for separating a vibroseis signal from its harmonics implies preliminary prediction of harmonics with their subsequent adaptive subtraction from the correlogram. To obtain the adaptation filter estimates, a statistical criterion is used that minimizes the energy of the subtraction result. The amplitudes of the signals in a seismic trace decay due to geometrical spreading, which leads to statistical inhomogeneity in the objective formed. Therefore, an increase in the statistical reliability of estimation should be associated with an increase in signal amplitudes at large recording times. On the other hand, the source records always contain additive noise, and the signal-to-noise ratio decreases at longer times. In order to provide a compromise between the growth of signal amplitudes and maintaining a satisfactory signal-to-noise ratio in the operator adjusting gate, self-tuning weighting functions are included into the objective. A method for modifying the objective is proposed, which enables increased performance of the algorithm.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133999253","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}
Pub Date : 2022-12-14DOI: 10.18303/2619-1563-2022-1-30
M. Denisov, A. A. Zykov
Properties of the ground force signal complicated by harmonics are studied. It is shown that the adaptation filters, that enable matching the amplitude- and phase- frequency characteristics of harmonics in the corresponding frequency range, have a simple form. The problem of focusing a signal containing harmonics using correlation and deconvolution is discussed. An example of using harmonics to expand the signal spectrum is given.
{"title":"Study of properties of real vibroseis signals contaminated by harmonic noise","authors":"M. Denisov, A. A. Zykov","doi":"10.18303/2619-1563-2022-1-30","DOIUrl":"https://doi.org/10.18303/2619-1563-2022-1-30","url":null,"abstract":"Properties of the ground force signal complicated by harmonics are studied. It is shown that the adaptation filters, that enable matching the amplitude- and phase- frequency characteristics of harmonics in the corresponding frequency range, have a simple form. The problem of focusing a signal containing harmonics using correlation and deconvolution is discussed. An example of using harmonics to expand the signal spectrum is given.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133485081","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}
Pub Date : 2022-12-14DOI: 10.18303/2619-1563-2022-1-134
N. Belovezhets, Y. Berezhnev, A. Jakovlev, S. Abramenkov, I. Abkadyrov
In the records of autonomous seismological observations occurrence of quartz watch clock drift often leads to incorrect time records. This paper presents a method for detecting such errors in a seismic station network based on the analysis of ambient seismic noise cross-correlation functions using Monte-Carlo Markov chain (MCMC) approach without using a reference signal. The proposed method was tested on the seismic data of a temporary seismic network installed on Paramushir Island in 2021-2022 for which time shifts were successfully estimated and corrections to the cross-correlation functions were made.
{"title":"Detection of clock errors in seismic records and estimation of time shifts for a seismic network","authors":"N. Belovezhets, Y. Berezhnev, A. Jakovlev, S. Abramenkov, I. Abkadyrov","doi":"10.18303/2619-1563-2022-1-134","DOIUrl":"https://doi.org/10.18303/2619-1563-2022-1-134","url":null,"abstract":"In the records of autonomous seismological observations occurrence of quartz watch clock drift often leads to incorrect time records. This paper presents a method for detecting such errors in a seismic station network based on the analysis of ambient seismic noise cross-correlation functions using Monte-Carlo Markov chain (MCMC) approach without using a reference signal. The proposed method was tested on the seismic data of a temporary seismic network installed on Paramushir Island in 2021-2022 for which time shifts were successfully estimated and corrections to the cross-correlation functions were made.","PeriodicalId":190530,"journal":{"name":"Russian Journal of Geophysical Technologies","volume":"147 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125869741","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}
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