Pub Date : 2021-06-23DOI: 10.1109/MetroAeroSpace51421.2021.9511746
M. Brzozowski, Mariusz Pakowski, Zbigniew Jakielaszek, M. Michalczewski, Mirosław Myszka
The article reviews selected issues associated with the preparation, organization and execution of field training targeting the practical functional verification of passive sensors installed on-board various land, sea and air platforms. The APART-GAS trials combined the training of two NATO research task groups (RTG) operating within the SET Panel: SET-242 on passive radiolocation on mobile platforms (Passive Coherent Locators on Mobile Platforms) and SET-258 on multiband active and passive radars used in various military scenarios (DMPAR - Deployable Multiband Passive Active Radar Deployment and Assessment in Military Scenarios). The specificity of passive sensors, as well as the wide range of their applications resulted in numerous complications at the stage of developing and executing test scenarios conducted with the use of different aircraft types, including vertical launch rockets, water vessels and land vehicles. The article discusses successively the activities supporting the Warsaw University of Technology implemented by the Air Force Institute of Technology (AFIT). in the field of installing the sensors on individual platform, aircraft flight planning and their coordination in the course of the trials. AFIT performed the issues regarding the recording and imaging radiolocation data from the sensors participating in the trials and coupled within an Unclassified Radar Network (URN).
{"title":"Challenges of preparation and realization of combined field tests of passive and active radar sensors on an example APART-GAS 2019 trials","authors":"M. Brzozowski, Mariusz Pakowski, Zbigniew Jakielaszek, M. Michalczewski, Mirosław Myszka","doi":"10.1109/MetroAeroSpace51421.2021.9511746","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace51421.2021.9511746","url":null,"abstract":"The article reviews selected issues associated with the preparation, organization and execution of field training targeting the practical functional verification of passive sensors installed on-board various land, sea and air platforms. The APART-GAS trials combined the training of two NATO research task groups (RTG) operating within the SET Panel: SET-242 on passive radiolocation on mobile platforms (Passive Coherent Locators on Mobile Platforms) and SET-258 on multiband active and passive radars used in various military scenarios (DMPAR - Deployable Multiband Passive Active Radar Deployment and Assessment in Military Scenarios). The specificity of passive sensors, as well as the wide range of their applications resulted in numerous complications at the stage of developing and executing test scenarios conducted with the use of different aircraft types, including vertical launch rockets, water vessels and land vehicles. The article discusses successively the activities supporting the Warsaw University of Technology implemented by the Air Force Institute of Technology (AFIT). in the field of installing the sensors on individual platform, aircraft flight planning and their coordination in the course of the trials. AFIT performed the issues regarding the recording and imaging radiolocation data from the sensors participating in the trials and coupled within an Unclassified Radar Network (URN).","PeriodicalId":236783,"journal":{"name":"2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"5 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123729326","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 : 2021-06-23DOI: 10.1109/MetroAeroSpace51421.2021.9511712
L. Mariani, Paola Celesti, F. Curianò, L. Cimino, Luigi Di Palo, S. H. Hossein, M. Rossetti, Mascia Bucciarelli, G. Zarcone
With the advent of the new space economy, number of satellites orbiting around the Earth is growing exponentially, this consequently increase the impact risk between operative satellite and space debris. Sapienza Space Systems and Space Surveillance Laboratory has developed several software, strategies, and observation systems setup in order to identify, classify and monitor object in orbit. Using an extensive network of astronomical observatories located in various locations around the world the aggregation of raw data and measurements relating to a big number of optical surveys of the sky vault, S5lab manages to maintain a high degree of Space Situational Awareness regarding space surveillance. This paper will expose an overview of all methodologies, strategies and systems setup used by the research group to determinate attitude of a satellite or a space debris.
{"title":"Overview of optical observation strategies and systems: LEO and GEO measurements acquisition for position and attitude determination","authors":"L. Mariani, Paola Celesti, F. Curianò, L. Cimino, Luigi Di Palo, S. H. Hossein, M. Rossetti, Mascia Bucciarelli, G. Zarcone","doi":"10.1109/MetroAeroSpace51421.2021.9511712","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace51421.2021.9511712","url":null,"abstract":"With the advent of the new space economy, number of satellites orbiting around the Earth is growing exponentially, this consequently increase the impact risk between operative satellite and space debris. Sapienza Space Systems and Space Surveillance Laboratory has developed several software, strategies, and observation systems setup in order to identify, classify and monitor object in orbit. Using an extensive network of astronomical observatories located in various locations around the world the aggregation of raw data and measurements relating to a big number of optical surveys of the sky vault, S5lab manages to maintain a high degree of Space Situational Awareness regarding space surveillance. This paper will expose an overview of all methodologies, strategies and systems setup used by the research group to determinate attitude of a satellite or a space debris.","PeriodicalId":236783,"journal":{"name":"2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129015268","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 : 2021-06-23DOI: 10.1109/MetroAeroSpace51421.2021.9511705
F. Sansone, Francesco Branz, Andrea Vettor, A. Francesconi
Small satellites are increasingly exploited for the realization of low Earth orbit (LEO) constellations for Earth imaging, global connectivity and data relay. Optical crosslinks between satellites can drastically increase the constellation capability to transmit data to ground stations with reduced latency and increased total throughput. One critical aspect of optical crosslink is the acquisition phase, which requires that each satellite scans its field of view looking for the beacon laser transmitted by the partner terminal before starting communication. In this paper, the problem of beacon acquisition for optical crosslinks is analyzed, with focus on the small satellite case. Numerical simulations and a simplified, yet representative laboratory experiment are carried out to evaluate and compare two different scanning techniques quantitatively.
{"title":"Acquisition Analysis for Small-Satellite Optical Crosslinks","authors":"F. Sansone, Francesco Branz, Andrea Vettor, A. Francesconi","doi":"10.1109/MetroAeroSpace51421.2021.9511705","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace51421.2021.9511705","url":null,"abstract":"Small satellites are increasingly exploited for the realization of low Earth orbit (LEO) constellations for Earth imaging, global connectivity and data relay. Optical crosslinks between satellites can drastically increase the constellation capability to transmit data to ground stations with reduced latency and increased total throughput. One critical aspect of optical crosslink is the acquisition phase, which requires that each satellite scans its field of view looking for the beacon laser transmitted by the partner terminal before starting communication. In this paper, the problem of beacon acquisition for optical crosslinks is analyzed, with focus on the small satellite case. Numerical simulations and a simplified, yet representative laboratory experiment are carried out to evaluate and compare two different scanning techniques quantitatively.","PeriodicalId":236783,"journal":{"name":"2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128084981","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 : 2021-06-23DOI: 10.1109/MetroAeroSpace51421.2021.9511709
2021 IEEE International Workshop on Metrology for AeroSpace.
2021年IEEE航空航天计量国际研讨会。
{"title":"2021 IEEE International Workshop on Metrology for AeroSpace","authors":"","doi":"10.1109/MetroAeroSpace51421.2021.9511709","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace51421.2021.9511709","url":null,"abstract":"2021 IEEE International Workshop on Metrology for AeroSpace.","PeriodicalId":236783,"journal":{"name":"2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130546886","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 : 2021-06-23DOI: 10.1109/MetroAeroSpace51421.2021.9511779
R. Marani, D. Palumbo, M. Attolico, G. Bono, U. Galietti, T. D’orazio
In the context of aerospace metrology, reliable inspections of production yields are mandatory for clear safety reasons. If defects are fastly detected and, above all, segmented, further economical benefits may emerge since repairing strategies can be set up. Given this scenario, this paper presents an automatic methodology to process data from lock-in thermography inspections of composite laminates. Thermal analysis works on area scans of the target surfaces and, consequently, leads to complete information of the whole structure in a relatively short time. A deep learning network has been trained to analyze amplitude and phase maps to detect and segment defective inclusions. The reliability of this analysis is typically undermined by actual experimental issues, due to the homogeneity of the input excitation. For this reason, this study proposes a preliminary processing to manage the inhomogeneity of the input excitation, which typically adds a non-negligible bias to the amplitude and phase maps. The improved reliability has been proven through experiments performed on actual samples, coming from aerospace production lines. The outcomes of these experiments have proven a final per-pixel accuracy of 84.38% in the segmentation of buried defects.
{"title":"Improved Deep Learning for Defect Segmentation in Composite Laminates Inspected by Lock-in Thermography","authors":"R. Marani, D. Palumbo, M. Attolico, G. Bono, U. Galietti, T. D’orazio","doi":"10.1109/MetroAeroSpace51421.2021.9511779","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace51421.2021.9511779","url":null,"abstract":"In the context of aerospace metrology, reliable inspections of production yields are mandatory for clear safety reasons. If defects are fastly detected and, above all, segmented, further economical benefits may emerge since repairing strategies can be set up. Given this scenario, this paper presents an automatic methodology to process data from lock-in thermography inspections of composite laminates. Thermal analysis works on area scans of the target surfaces and, consequently, leads to complete information of the whole structure in a relatively short time. A deep learning network has been trained to analyze amplitude and phase maps to detect and segment defective inclusions. The reliability of this analysis is typically undermined by actual experimental issues, due to the homogeneity of the input excitation. For this reason, this study proposes a preliminary processing to manage the inhomogeneity of the input excitation, which typically adds a non-negligible bias to the amplitude and phase maps. The improved reliability has been proven through experiments performed on actual samples, coming from aerospace production lines. The outcomes of these experiments have proven a final per-pixel accuracy of 84.38% in the segmentation of buried defects.","PeriodicalId":236783,"journal":{"name":"2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125540227","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 : 2021-06-23DOI: 10.1109/MetroAeroSpace51421.2021.9511717
G. Caposciutti, G. Bandini, M. Marracci, A. Buffi, B. Tellini
Carbon fiber reinforced polymers (CFRPs) are particularly suitable for aerospace applications due to their specific mechanical properties. During their service life, these materials can suffer damage, sometimes difficult to detect, which may compromise their mechanical performances. The variation of the electrical properties of CFRPs is one of the strategies that can be used to monitor such damage. However, multiple variables contribute to this variation. This paper presents a preliminary analysis of the electrical impedance dependence on temperature and on damages outbreaks. The measurements are performed in controlled environment on a wide range of temperature and frequency. In some cases, the measured data show an impedance change due to the damage presence, which is of similar entity with respect to the variations caused by temperature. This may lead to misleading interpretations of impedance measurements in the absence of additional information. Hence the need of a proper temperature monitoring to possibly use electrical impedance spectroscopy analysis is required to unequivocally determine the health status of CFRPs.
{"title":"Temperature Effects and Damage Detection on CFRP through Electrical Impedance Spectroscopy","authors":"G. Caposciutti, G. Bandini, M. Marracci, A. Buffi, B. Tellini","doi":"10.1109/MetroAeroSpace51421.2021.9511717","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace51421.2021.9511717","url":null,"abstract":"Carbon fiber reinforced polymers (CFRPs) are particularly suitable for aerospace applications due to their specific mechanical properties. During their service life, these materials can suffer damage, sometimes difficult to detect, which may compromise their mechanical performances. The variation of the electrical properties of CFRPs is one of the strategies that can be used to monitor such damage. However, multiple variables contribute to this variation. This paper presents a preliminary analysis of the electrical impedance dependence on temperature and on damages outbreaks. The measurements are performed in controlled environment on a wide range of temperature and frequency. In some cases, the measured data show an impedance change due to the damage presence, which is of similar entity with respect to the variations caused by temperature. This may lead to misleading interpretations of impedance measurements in the absence of additional information. Hence the need of a proper temperature monitoring to possibly use electrical impedance spectroscopy analysis is required to unequivocally determine the health status of CFRPs.","PeriodicalId":236783,"journal":{"name":"2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122877146","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 : 2021-06-23DOI: 10.1109/MetroAeroSpace51421.2021.9511724
Z. Czyz, P. Karpiński, K. Skiba
The aerodynamic properties of propellers strictly depend on their geometry. Pitch is one of the key parameters defining propeller performance. This paper presents the results of a wind-tunnel investigation of the propellers for the unmanned aerial vehicle. In this paper, the performance of a set of 12-inch propellers with different pitch values for different values of air velocity was analyzed. The tests were performed on a specially designed test stand placed in a wind tunnel test chamber. The test stand enabled adjustment of the air velocity as well as the propeller rotational speed. An adequately selected set of sensors allowed to record the defined parameters. Obtained results allowed to evaluate the performance of the considered propellers with different pitch values in forced airflow conditions.
{"title":"Wind tunnel investigation of the propellers for unmanned aerial vehicle","authors":"Z. Czyz, P. Karpiński, K. Skiba","doi":"10.1109/MetroAeroSpace51421.2021.9511724","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace51421.2021.9511724","url":null,"abstract":"The aerodynamic properties of propellers strictly depend on their geometry. Pitch is one of the key parameters defining propeller performance. This paper presents the results of a wind-tunnel investigation of the propellers for the unmanned aerial vehicle. In this paper, the performance of a set of 12-inch propellers with different pitch values for different values of air velocity was analyzed. The tests were performed on a specially designed test stand placed in a wind tunnel test chamber. The test stand enabled adjustment of the air velocity as well as the propeller rotational speed. An adequately selected set of sensors allowed to record the defined parameters. Obtained results allowed to evaluate the performance of the considered propellers with different pitch values in forced airflow conditions.","PeriodicalId":236783,"journal":{"name":"2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129211658","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 : 2021-06-23DOI: 10.1109/MetroAeroSpace51421.2021.9511773
M. Orefice, V. Quaranta, G. Bruno, Giuseppe Martinotti, Carmine Carandente Tartaglia
Satellites are designed and tested to withstand to static and dynamic operative loads during the launch and the ascent phase. The validation of the structural design of the satellite is generally performed by tests and/or analysis. The paper presents the static load test methods with a focus on the sine-burst quasi-static load test. A test procedure will be presented in order to overcome the main issues related to a sine-burst test. Finally test results performed on a 6U Cubesat will be discussed.
{"title":"Quasi-static load space qualification test","authors":"M. Orefice, V. Quaranta, G. Bruno, Giuseppe Martinotti, Carmine Carandente Tartaglia","doi":"10.1109/MetroAeroSpace51421.2021.9511773","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace51421.2021.9511773","url":null,"abstract":"Satellites are designed and tested to withstand to static and dynamic operative loads during the launch and the ascent phase. The validation of the structural design of the satellite is generally performed by tests and/or analysis. The paper presents the static load test methods with a focus on the sine-burst quasi-static load test. A test procedure will be presented in order to overcome the main issues related to a sine-burst test. Finally test results performed on a 6U Cubesat will be discussed.","PeriodicalId":236783,"journal":{"name":"2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128645515","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 : 2021-06-23DOI: 10.1109/MetroAeroSpace51421.2021.9511742
P. Longobardi, G. Laupré, J. Skaloud
Vehicle Dynamic Model based navigation represents a novel approach to autonomous navigation for small UAVs. It significantly improves the navigation solution under GNSS outage condition without adding additional sensors to the platform. This paper proposes an alternative method for determination of the aerodynamic coefficients characterizing the system dynamics needed to enable VDM-based navigation. It relies on the usage of post-processed traditional INS/GNSS navigation solution for the estimation of initial values of the aerodynamic coefficients. The importance of optimal selection of experimental data is highlighted, proposing an evaluation criterion whose benefit is the increase of the statistical significance of the coefficient estimation.
{"title":"Aerodynamic characterization of a Delta-wing UAV based on real flight data processing","authors":"P. Longobardi, G. Laupré, J. Skaloud","doi":"10.1109/MetroAeroSpace51421.2021.9511742","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace51421.2021.9511742","url":null,"abstract":"Vehicle Dynamic Model based navigation represents a novel approach to autonomous navigation for small UAVs. It significantly improves the navigation solution under GNSS outage condition without adding additional sensors to the platform. This paper proposes an alternative method for determination of the aerodynamic coefficients characterizing the system dynamics needed to enable VDM-based navigation. It relies on the usage of post-processed traditional INS/GNSS navigation solution for the estimation of initial values of the aerodynamic coefficients. The importance of optimal selection of experimental data is highlighted, proposing an evaluation criterion whose benefit is the increase of the statistical significance of the coefficient estimation.","PeriodicalId":236783,"journal":{"name":"2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"362 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115561207","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 : 2021-06-23DOI: 10.1109/MetroAeroSpace51421.2021.9511682
A. Olejnik, R. Rogólski, M. Szczesniak
Measurement of vibrations of the entire aircraft or individual components is very important in the design and operation of aircraft. It should be known that the correct performance of such measurements requires specialized measuring devices, appropriate knowledge and experience. This paper presents two basic methods of measuring the vibration of realaircraft structures. The presented measuring apparatus are dedicated to the aviation industry. First, the apparatus for measuring vibrations with the contact method will be presented, and then with the non-contact method. The advantages and disadvantages of both methods will be presented and examples of application will be shown.
{"title":"Contact and non-contact methods of vibration measurement in aircraft structures","authors":"A. Olejnik, R. Rogólski, M. Szczesniak","doi":"10.1109/MetroAeroSpace51421.2021.9511682","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace51421.2021.9511682","url":null,"abstract":"Measurement of vibrations of the entire aircraft or individual components is very important in the design and operation of aircraft. It should be known that the correct performance of such measurements requires specialized measuring devices, appropriate knowledge and experience. This paper presents two basic methods of measuring the vibration of realaircraft structures. The presented measuring apparatus are dedicated to the aviation industry. First, the apparatus for measuring vibrations with the contact method will be presented, and then with the non-contact method. The advantages and disadvantages of both methods will be presented and examples of application will be shown.","PeriodicalId":236783,"journal":{"name":"2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122766343","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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