Pub Date : 2024-07-12DOI: 10.1134/s0038094624700278
V. V. Emel’yanenko
Abstract—
Numerical modeling of the interaction of giant planets and the planetesimal disk was carried out for the Nice model, in which the initial orbits of the planets are in resonant configurations. In addition to the standard Nice model, planetesimals in the planetary region were considered and the self-gravity of the planetesimal disk was taken into account. The dynamic evolution of planetary systems has been studied over time intervals on the order of the lifetime of the Solar System. Options have been found in which planetary systems are preserved over billions of years, the final orbits of the planets are close to modern orbits and distant trans-Neptunian objects exist.
{"title":"Study of Migration of Giant Planets and Formation of Populations of Distant Trans-Neptunian Objects in the Nice Model","authors":"V. V. Emel’yanenko","doi":"10.1134/s0038094624700278","DOIUrl":"https://doi.org/10.1134/s0038094624700278","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>Numerical modeling of the interaction of giant planets and the planetesimal disk was carried out for the Nice model, in which the initial orbits of the planets are in resonant configurations. In addition to the standard Nice model, planetesimals in the planetary region were considered and the self-gravity of the planetesimal disk was taken into account. The dynamic evolution of planetary systems has been studied over time intervals on the order of the lifetime of the Solar System. Options have been found in which planetary systems are preserved over billions of years, the final orbits of the planets are close to modern orbits and distant trans-Neptunian objects exist.</p>","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-12DOI: 10.1134/s0038094624700345
E. A. Grishakina, Zh. F. Rodionova, E. A. Feoktistova, E. N. Slyuta, V. V. Shevchenko
Abstract—
The results of creating a map of the circumpolar regions of the Moon are described. The maps are limited to latitudes +/–55° to show the location of the Luna-25 landing. The article also provides a brief overview of space missions to the Moon.
{"title":"Map of the Circumpolar Regions of the Moon from Latitudes +/–55°","authors":"E. A. Grishakina, Zh. F. Rodionova, E. A. Feoktistova, E. N. Slyuta, V. V. Shevchenko","doi":"10.1134/s0038094624700345","DOIUrl":"https://doi.org/10.1134/s0038094624700345","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>The results of creating a map of the circumpolar regions of the Moon are described. The maps are limited to latitudes +/–55° to show the location of the <i>Luna-25</i> landing. The article also provides a brief overview of space missions to the Moon.</p>","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-12DOI: 10.1134/s0038094624700242
T. V. Bordovitsyna, N. S. Bakhtigaraev, P. A. Levkina, N. A. Popandopulo, K. V. Saleiko, I. V. Tomilova, O. S. Novikova
Abstract—
A technique for joint use of positional and photometric measurements to determine the dynamic parameters of space debris (SD) objects is given. We present the results of its application to the assessment of the dynamic parameters of the motion of a group of objects in the geostationary area (GSA) based on observations made on the Zeiss-2000 telescope at the Terskol Observatory Center for Collective Use of the Institute of Astronomy of the Russian Academy of Sciences. We pay great attention to the problem of rejecting measurements, taking into account the specifics of presenting observations of SD objects. The determined parameters include the state vector of the object (coordinates and speed) at a given epoch, the value of the average object windage, the change in the area of its midsection and an approximate mass assessment.
{"title":"Determination of Dynamic Parameters of a Group of Space Debris Objects in Geostationary Area According to Positional and Photometric Measurements","authors":"T. V. Bordovitsyna, N. S. Bakhtigaraev, P. A. Levkina, N. A. Popandopulo, K. V. Saleiko, I. V. Tomilova, O. S. Novikova","doi":"10.1134/s0038094624700242","DOIUrl":"https://doi.org/10.1134/s0038094624700242","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>A technique for joint use of positional and photometric measurements to determine the dynamic parameters of space debris (SD) objects is given. We present the results of its application to the assessment of the dynamic parameters of the motion of a group of objects in the geostationary area (GSA) based on observations made on the Zeiss-2000 telescope at the Terskol Observatory Center for Collective Use of the Institute of Astronomy of the Russian Academy of Sciences. We pay great attention to the problem of rejecting measurements, taking into account the specifics of presenting observations of SD objects. The determined parameters include the state vector of the object (coordinates and speed) at a given epoch, the value of the average object windage, the change in the area of its midsection and an approximate mass assessment.</p>","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-12DOI: 10.1134/s0038094624700308
A. B. Manukin, N. F. Sayakina, N. A. Chernogorova, A. K. Ton’shev, I. I. Kalinnikov
Abstract
A three-axis seismic accelerometer was developed and created, containing three uniaxial mutually perpendicular sensors, the sensitivity axis of each sensor is located at an angle of 54.736° to the local gravitational vertical. For the first time, additional magnetic rigidity has been introduced into each device, allowing the device to be finely tuned to the conditions of a particular planet. However, the accumulated experience in conducting ground-based tests has shown the need to improve the uniaxial seismic accelerometer, which can significantly improve the characteristics of the device. First, we use a single material—beryllium bronze BrB-2—for the manufacture of massive test mass suspension elements with a thickness of 1.5 mm and an elastic element made of a thin strip 10–20 microns thick, which reduces the likelihood of instability. Secondly, we reduce the gap in the capacitors of capacitive converters from 0.25 to 0.1–0.15 mm to significantly increase the conversion slope of the capacitive sensor. Thirdly, we change the technology of setting up the device, for which we combine all the elements of the sensitive part of a uniaxial seismogravimeter using special vertical inserts. This allows us to place the device as a whole in a system for its configuration, eliminating the possibility of failure of individual elements, thereby increasing the reliability of the device.
{"title":"Improvement of a Uniaxial Seismic Accelerometer, an Integral Part of the Three-Axis Seismic Accelerometer SEM (ExoMars Seismometer)","authors":"A. B. Manukin, N. F. Sayakina, N. A. Chernogorova, A. K. Ton’shev, I. I. Kalinnikov","doi":"10.1134/s0038094624700308","DOIUrl":"https://doi.org/10.1134/s0038094624700308","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A three-axis seismic accelerometer was developed and created, containing three uniaxial mutually perpendicular sensors, the sensitivity axis of each sensor is located at an angle of 54.736° to the local gravitational vertical. For the first time, additional magnetic rigidity has been introduced into each device, allowing the device to be finely tuned to the conditions of a particular planet. However, the accumulated experience in conducting ground-based tests has shown the need to improve the uniaxial seismic accelerometer, which can significantly improve the characteristics of the device. First, we use a single material—beryllium bronze BrB-2—for the manufacture of massive test mass suspension elements with a thickness of 1.5 mm and an elastic element made of a thin strip 10–20 microns thick, which reduces the likelihood of instability. Secondly, we reduce the gap in the capacitors of capacitive converters from 0.25 to 0.1–0.15 mm to significantly increase the conversion slope of the capacitive sensor. Thirdly, we change the technology of setting up the device, for which we combine all the elements of the sensitive part of a uniaxial seismogravimeter using special vertical inserts. This allows us to place the device as a whole in a system for its configuration, eliminating the possibility of failure of individual elements, thereby increasing the reliability of the device.</p>","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-12DOI: 10.1134/s003809462470028x
A. O. Novichonok, A. A. Shmal’ts, S. V. Nazarov, A. S. Pozanenko, E. V. Novichonok, M. A. Tereshina, V. A. Voropaev
Abstract
7P/Pons–Winnecke is a near-Earth short-period comet of a moderate activity level. In this paper, we present the analysis of observations performed during a favorable apparition of the comet in 2021, indicating its status as a transitional ageing comet. The sublimation starts when the comet is close to the Sun, at a distance of RON = 1.76 ± 0.1 AU, and continues for ~13 months, which is apparently caused by residual reserves of water ice. The dust production rate of the comet is not high even at perihelion (<150 kg/s), and the 1.4-percent active portion of the nucleus area is sufficient to provide this mass loss. The photometric age of the comet is PAGE = 54.4 comet years; being combined with a light curve amplitude of ASEC(1;1) = 5.5m, this age corresponds to the state of a transitional middle-aged comet.
{"title":"The Evolutionary State of Near-Earth Comet 7P/Pons–Winnecke","authors":"A. O. Novichonok, A. A. Shmal’ts, S. V. Nazarov, A. S. Pozanenko, E. V. Novichonok, M. A. Tereshina, V. A. Voropaev","doi":"10.1134/s003809462470028x","DOIUrl":"https://doi.org/10.1134/s003809462470028x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>7P/Pons–Winnecke is a near-Earth short-period comet of a moderate activity level. In this paper, we present the analysis of observations performed during a favorable apparition of the comet in 2021, indicating its status as a transitional ageing comet. The sublimation starts when the comet is close to the Sun, at a distance of <i>R</i><sub>ON</sub> = 1.76 ± 0.1 AU, and continues for ~13 months, which is apparently caused by residual reserves of water ice. The dust production rate of the comet is not high even at perihelion (<150 kg/s), and the 1.4-percent active portion of the nucleus area is sufficient to provide this mass loss. The photometric age of the comet is <i>P</i><sub>AGE</sub> = 54.4 comet years; being combined with a light curve amplitude of <i>A</i><sub>SEC</sub>(1;1) = 5.5<sup><i>m</i></sup>, this age corresponds to the state of a transitional middle-aged comet.</p>","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-12DOI: 10.1134/s0038094624700291
J. Semkova, V. Bengin, R. Koleva, K. Krastev, Y. Matveychuk, B. Tomov, N. Bankov, S. Malchev, Ts. Dachev, V. Shurshakov, S. Drobyshev, I. Mitrofanov, D. Golovin, A. Kozyrev, M. Litvak, M. Mokrousov
Abstract—
The article provides a brief description of the Liulin-MO dosimeter, which is part of the FREND (Fine Resolution Epithermal Neutron Detector) device installed on the TGO (Trace Gas Orbiter) spacecraft of the ExoMars-2016 mission. Since April 2018, TGO has been operating in orbit around Mars. Data are presented on the radiation environment in the orbit of Mars during the decline phase of the 24th cycle of solar activity and the growth phase of the 25th cycle. During the period under review, a maximum flux and dose rate due to galactic cosmic rays (GCR) were observed. Between July 2021 and March 2023, the Liulin-MO dosimeter recorded eight increases in particle fluxes and dose rates from solar proton events (SPEs). Data are presented on the radiation environment during the SPE in Mars orbit in July 2021–March 2022, when Mars was on the opposite side of the Sun from Earth. A comparison is made of particle fluxes measured in orbits around the Earth and Mars.
{"title":"New Results of Radiation Study on Board TGO ExoMars in 2018–2023","authors":"J. Semkova, V. Bengin, R. Koleva, K. Krastev, Y. Matveychuk, B. Tomov, N. Bankov, S. Malchev, Ts. Dachev, V. Shurshakov, S. Drobyshev, I. Mitrofanov, D. Golovin, A. Kozyrev, M. Litvak, M. Mokrousov","doi":"10.1134/s0038094624700291","DOIUrl":"https://doi.org/10.1134/s0038094624700291","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>The article provides a brief description of the Liulin-MO dosimeter, which is part of the FREND (Fine Resolution Epithermal Neutron Detector) device installed on the <i>TGO</i> (<i>Trace Gas Orbiter</i>) spacecraft of the <i>ExoMars-2016</i> mission. Since April 2018, <i>TGO</i> has been operating in orbit around Mars. Data are presented on the radiation environment in the orbit of Mars during the decline phase of the 24th cycle of solar activity and the growth phase of the 25th cycle. During the period under review, a maximum flux and dose rate due to galactic cosmic rays (GCR) were observed. Between July 2021 and March 2023, the Liulin-MO dosimeter recorded eight increases in particle fluxes and dose rates from solar proton events (SPEs). Data are presented on the radiation environment during the SPE in Mars orbit in July 2021–March 2022, when Mars was on the opposite side of the Sun from Earth. A comparison is made of particle fluxes measured in orbits around the Earth and Mars.</p>","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-20DOI: 10.1134/S0038094624700163
V. Zubko, N. Eismont, R. Nazirov, K. Fedyaev, A. A. Belyaev
{"title":"Analysis of Spacecraft Flight Trajectories to Venus with a Flyby of Asteroids","authors":"V. Zubko, N. Eismont, R. Nazirov, K. Fedyaev, A. A. Belyaev","doi":"10.1134/S0038094624700163","DOIUrl":"https://doi.org/10.1134/S0038094624700163","url":null,"abstract":"","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141119690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-20DOI: 10.1134/S0038094624700151
T. Galushina, O. Letner, O. Syusina
{"title":"Studying the Dynamics of Multiplets of Orbital Resonances of Asteroids with Small Perihelion Distances","authors":"T. Galushina, O. Letner, O. Syusina","doi":"10.1134/S0038094624700151","DOIUrl":"https://doi.org/10.1134/S0038094624700151","url":null,"abstract":"","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141121914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-20DOI: 10.1134/s0038094624700175
A. E. Mukhamedzhanova
{"title":"Valley Relief of the Northeastern Part of Terra Cimmeria on Mars","authors":"A. E. Mukhamedzhanova","doi":"10.1134/s0038094624700175","DOIUrl":"https://doi.org/10.1134/s0038094624700175","url":null,"abstract":"","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141120101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-20DOI: 10.1134/s0038094623600257
Yahya Barzegar, Mahnoosh Biglari, Ali Ghanbari
Abstract
The rock walls of Valles Marineris (VM) valleys on Mars reveal significant gravitational failures, resulting in a sequence of massive landslides spanning several hundred cubic kilometers in volume. For further Mars exploration missions, it is critical to understand which characteristics impact the stability of these rock walls. In this work, ArcGIS is used to identify 30 steep slopes. Utilizing the finite element method, we calculate the proposed seven possibly landslide-prone slopes based on geometry in VM. Using Strength Reduction Method (SRM) in Midas GTS NX, the impacts of variations in cohesion, internal friction angle, unit weight, and elastic modulus of soil and rock on the slope safety factor against landslides are evaluated. The Strength Reduction Method (SRM) is a widely used approach in geotechnical engineering to assess slope stability. It involves systematically reducing the strength parameters of the soil and rock materials within the slope until failure occurs. By iteratively reducing the strength parameters, the SRM calculates the factor of safety against landslides. Internal friction angle is the most critical factor in determining the stability of a slope under low gravity circumstances since it has the widest range of possible alterations. Furthermore, the material’s cohesion and unit weight significantly impact the safety factor, although elastic modulus barely affects slope stability. A modulus of elasticity of more than 35 GPa will not enhance the factor of safety. There is no significant difference in soil suction between Earth and Martian gravities near the surface water table. However, as the groundwater depth increases, soil suction under Martian gravity becomes notably lower than that on Earth. Additionally, consistent with prior investigations, the Vadose zone on Mars is positioned at higher elevations relative to Earth, indicating the presence of a higher capillary fringe. Furthermore, the factor of safety for slope stability consistently outperforms Earth for equivalent slope configurations under unsaturated conditions, with approximately 2.5 times higher factor of safety for higher suctions and approximately 1.5 times higher factor of safety for lower suctions compared to Earth.
{"title":"Numerical Investigation of Slope Stability in Valles Marineris, Mars","authors":"Yahya Barzegar, Mahnoosh Biglari, Ali Ghanbari","doi":"10.1134/s0038094623600257","DOIUrl":"https://doi.org/10.1134/s0038094623600257","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The rock walls of Valles Marineris (VM) valleys on Mars reveal significant gravitational failures, resulting in a sequence of massive landslides spanning several hundred cubic kilometers in volume. For further Mars exploration missions, it is critical to understand which characteristics impact the stability of these rock walls. In this work, ArcGIS is used to identify 30 steep slopes. Utilizing the finite element method, we calculate the proposed seven possibly landslide-prone slopes based on geometry in VM. Using Strength Reduction Method (SRM) in Midas GTS NX, the impacts of variations in cohesion, internal friction angle, unit weight, and elastic modulus of soil and rock on the slope safety factor against landslides are evaluated. The Strength Reduction Method (SRM) is a widely used approach in geotechnical engineering to assess slope stability. It involves systematically reducing the strength parameters of the soil and rock materials within the slope until failure occurs. By iteratively reducing the strength parameters, the SRM calculates the factor of safety against landslides. Internal friction angle is the most critical factor in determining the stability of a slope under low gravity circumstances since it has the widest range of possible alterations. Furthermore, the material’s cohesion and unit weight significantly impact the safety factor, although elastic modulus barely affects slope stability. A modulus of elasticity of more than 35 GPa will not enhance the factor of safety. There is no significant difference in soil suction between Earth and Martian gravities near the surface water table. However, as the groundwater depth increases, soil suction under Martian gravity becomes notably lower than that on Earth. Additionally, consistent with prior investigations, the Vadose zone on Mars is positioned at higher elevations relative to Earth, indicating the presence of a higher capillary fringe. Furthermore, the factor of safety for slope stability consistently outperforms Earth for equivalent slope configurations under unsaturated conditions, with approximately 2.5 times higher factor of safety for higher suctions and approximately 1.5 times higher factor of safety for lower suctions compared to Earth.</p>","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141150769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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