Pub Date : 1900-01-01DOI: 10.36652/1813-1336-2022-18-2-61-65
V. Kukareko, A. Kushnerov
The mechanism of wear of 40Kh13 steel modified with nitrogen ions, subjected to preliminary heat treatment in various modes, has been investigated. It is shown that the phase composition of the nitrided layer includes chromium nitride CrN and a matrix phase α-Fe. It was found that in the process of friction of the nitrogen-modified steel 40Kh13, accelerated wear of the nitrided layer is recorded with a decrease in its thickness to a certain critical value. It is shown that with an increase in substrate hardness, the critical thickness of the nitrided layer decreases from 11...12 μm to 9...10 μm.
{"title":"Influence of pre-heat treatment on wear resistance of 40Kh13 steel modified with nitrogen ions","authors":"V. Kukareko, A. Kushnerov","doi":"10.36652/1813-1336-2022-18-2-61-65","DOIUrl":"https://doi.org/10.36652/1813-1336-2022-18-2-61-65","url":null,"abstract":"The mechanism of wear of 40Kh13 steel modified with nitrogen ions, subjected to preliminary heat treatment in various modes, has been investigated. It is shown that the phase composition of the nitrided layer includes chromium nitride CrN and a matrix phase α-Fe. It was found that in the process of friction of the nitrogen-modified steel 40Kh13, accelerated wear of the nitrided layer is recorded with a decrease in its thickness to a certain critical value. It is shown that with an increase in substrate hardness, the critical thickness of the nitrided layer decreases from 11...12 μm to 9...10 μm.","PeriodicalId":178558,"journal":{"name":"Strengthening Technologies and Coatings","volume":"325 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132705829","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 : 1900-01-01DOI: 10.36652/1813-1336-2021-17-12-557-564
N. Ulakhanov, U. Mishigdorzhiyn, A. Tikhonov, A. Shustov, A. Pyatykh
The effect of diffusion high-temperature boroaluminizing (HBA) on the mechanical properties and quality parameters of the surface layer of stamp steels 5KhNM and 3Kh2V8F is shown. An analysis of the microstructure and composition of diffusion composite layers obtained as a result of thermal-chemical treatment (TCT) is presented and the distribution of microhardness in these layers is studied depending on the formed borides and carbides. The influence of processing temperature modes of on the parameters of roughness was experimentally established and the wear resistance characteristics of the processed surfaces of the investigated materials were determined.
{"title":"Surface modification of die steels with B—Al-layers by thermal-chemical treatment","authors":"N. Ulakhanov, U. Mishigdorzhiyn, A. Tikhonov, A. Shustov, A. Pyatykh","doi":"10.36652/1813-1336-2021-17-12-557-564","DOIUrl":"https://doi.org/10.36652/1813-1336-2021-17-12-557-564","url":null,"abstract":"The effect of diffusion high-temperature boroaluminizing (HBA) on the mechanical properties and quality parameters of the surface layer of stamp steels 5KhNM and 3Kh2V8F is shown. An analysis of the microstructure and composition of diffusion composite layers obtained as a result of thermal-chemical treatment (TCT) is presented and the distribution of microhardness in these layers is studied depending on the formed borides and carbides. The influence of processing temperature modes of on the parameters of roughness was experimentally established and the wear resistance characteristics of the processed surfaces of the investigated materials were determined.","PeriodicalId":178558,"journal":{"name":"Strengthening Technologies and Coatings","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132129898","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 : 1900-01-01DOI: 10.36652/1813-1336-2020-16-12-531-538
Y. Mashkov, K. Poleshchenko, E. Eremin, A. Teploukhov, S. N. Nesov, N. Semenyuk, G. Seropyan, E. Shubenkova
The results of researches devoted to solving the problem of obtaining of layered-reinforced nanocomposite based on polytetrafluoroethylene are presented. To ensure the required adhesive strength between the polymer base and the metal coating based on molybdenum, the surface layer of the base is reinforced with dispersed particles of zirconium dioxide. It is found that when reinforced with zirconium dioxide, the structure of polytetrafluoroethylene becomes more dense, and the ratio of atomic concentrations of fluorine and carbon in its composition decreases, which indicates decrease in the number of saturated fluorocarbon bonds in the polymer and leads to higher chemical activity of polytetrafluoroethylene. The obtained data on change in the chemical state of the layered-reinforced composite components indicate high degree of interaction between the polymer matrix elements, reinforcing components and coating elements in the area of the intermediate mesolayer.
{"title":"Preparation of layer-reinforced nanocomposite based on polytetrafl uoroethylene by laser ablation and ion-plasma modifi cation","authors":"Y. Mashkov, K. Poleshchenko, E. Eremin, A. Teploukhov, S. N. Nesov, N. Semenyuk, G. Seropyan, E. Shubenkova","doi":"10.36652/1813-1336-2020-16-12-531-538","DOIUrl":"https://doi.org/10.36652/1813-1336-2020-16-12-531-538","url":null,"abstract":"The results of researches devoted to solving the problem of obtaining of layered-reinforced nanocomposite\u0000based on polytetrafluoroethylene are presented. To ensure the required adhesive strength between the polymer base\u0000and the metal coating based on molybdenum, the surface layer of the base is reinforced with dispersed particles of\u0000zirconium dioxide. It is found that when reinforced with zirconium dioxide, the structure of polytetrafluoroethylene\u0000becomes more dense, and the ratio of atomic concentrations of fluorine and carbon in its composition decreases,\u0000which indicates decrease in the number of saturated fluorocarbon bonds in the polymer and leads to higher chemical activity of polytetrafluoroethylene. The obtained data on change in the chemical state of the layered-reinforced\u0000composite components indicate high degree of interaction between the polymer matrix elements, reinforcing components and coating elements in the area of the intermediate mesolayer.","PeriodicalId":178558,"journal":{"name":"Strengthening Technologies and Coatings","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132151628","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 : 1900-01-01DOI: 10.36652/1813-1336-2022-18-1-6-13
S. Zaides, Ho Minh Quan
It is described the effect of the frequency of circular oscillations of a sectorial working tool on the stressstrain state of cylindrical parts. As a result of computer modeling, it was revealed that under the same loading conditions, the action of a working tool with different frequencies of circular oscillations creates different values of temporary and residual stresses. In the case of movement in one direction of the tool and the workpiece, the minimum value of stresses is formed, and with their oncoming movement, the value of the maximum stresses increases by 15...40 %. The resulting value of the residual stresses generally increases. With an increase in the frequency of circular oscillation of the working tool, the intensity of residual stresses increases by 1.2...2 times. The intensity of deformation changes in direct proportion to the value of the frequency of the circular oscillation and the depth of plastic deformation reaches 2.1...2.8 mm.
{"title":"Determination of the stress-deformed state of cylindrical parts at circular oscillation of a sectorial working tool","authors":"S. Zaides, Ho Minh Quan","doi":"10.36652/1813-1336-2022-18-1-6-13","DOIUrl":"https://doi.org/10.36652/1813-1336-2022-18-1-6-13","url":null,"abstract":"It is described the effect of the frequency of circular oscillations of a sectorial working tool on the stressstrain state of cylindrical parts. As a result of computer modeling, it was revealed that under the same loading conditions, the action of a working tool with different frequencies of circular oscillations creates different values of temporary and residual stresses. In the case of movement in one direction of the tool and the workpiece, the minimum value of stresses is formed, and with their oncoming movement, the value of the maximum stresses increases by 15...40 %. The resulting value of the residual stresses generally increases. With an increase in the frequency of circular oscillation of the working tool, the intensity of residual stresses increases by 1.2...2 times. The intensity of deformation changes in direct proportion to the value of the frequency of the circular oscillation and the depth of plastic deformation reaches 2.1...2.8 mm.","PeriodicalId":178558,"journal":{"name":"Strengthening Technologies and Coatings","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133118339","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 : 1900-01-01DOI: 10.36652/1813-1336-2021-17-9-401-405
V. Butenko, Philip Pastukhov
The forming of parameters of quality of parts flat surfaces during their rolling by strengthening roller is studied and it is shown that for each value of rolling force there are extremely achievable indicators of quality of the surface layer. It has been established that the spread of quality indicators values on the strengthened surface of the part is stabilized and becomes minimal after three passes of the roller. The functional dependence of the roughness parameter value of the part flat surface on it’s previous value and rolling mode is obtained, which allows solving a number of technological problem.
{"title":"Formation of quality indicators for flat surfaces of machine parts when running them with a reinforcing roller","authors":"V. Butenko, Philip Pastukhov","doi":"10.36652/1813-1336-2021-17-9-401-405","DOIUrl":"https://doi.org/10.36652/1813-1336-2021-17-9-401-405","url":null,"abstract":"The forming of parameters of quality of parts flat surfaces during their rolling by strengthening roller is studied and it is shown that for each value of rolling force there are extremely achievable indicators of quality of the surface layer. It has been established that the spread of quality indicators values on the strengthened surface of the part is stabilized and becomes minimal after three passes of the roller. The functional dependence of the roughness parameter value of the part flat surface on it’s previous value and rolling mode is obtained, which allows solving a number of technological problem.","PeriodicalId":178558,"journal":{"name":"Strengthening Technologies and Coatings","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114692639","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 : 1900-01-01DOI: 10.36652/1813-1336-2023-19-3-105-110
The dependence of the deviation from roundness (Δcr) of cylindrical parts on the main technological parameters of the pendulum RPM has been experimentally determined. It has been established that the pendulum SPD helps to reduce the deviation from roundness, and, consequently, to increase the accuracy of the diametrical dimensions of parts by 3—4 grades, while the minimum value of 6.2...6.4 μm is achieved under conditions of low deformation rate. In addition, using the statistica 10.1 software package, the measurement results were processed to determine the optimal modes that provide the smallest value.
{"title":"Deviation from roundness of cylindrical parts under pendulum surface plastic deformation","authors":"","doi":"10.36652/1813-1336-2023-19-3-105-110","DOIUrl":"https://doi.org/10.36652/1813-1336-2023-19-3-105-110","url":null,"abstract":"The dependence of the deviation from roundness (Δcr) of cylindrical parts on the main technological parameters of the pendulum RPM has been experimentally determined. It has been established that the pendulum SPD helps to reduce the deviation from roundness, and, consequently, to increase the accuracy of the diametrical dimensions of parts by 3—4 grades, while the minimum value of 6.2...6.4 μm is achieved under conditions of low deformation rate. In addition, using the statistica 10.1 software package, the measurement results were processed to determine the optimal modes that provide the smallest value.","PeriodicalId":178558,"journal":{"name":"Strengthening Technologies and Coatings","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131966851","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 : 1900-01-01DOI: 10.36652/1813-1336-2023-19-8-370-377
M. Migranov, A. Gusev, A. Migranov, D. S. Repin, N. V. Kolosova
The paper presents the results of experimental studies of tribological properties of innovative composite nanostructured wear-resistant coatings during high-speed turning of heat-resistant and heat-resistant steels and alloys, as well as temperature and force conditions, contact processes in the cutting zone based on the use of equipment and equipment for control and registration of electrophysical parameters that accompany the process of blade cutting (thermal EMF and electrical conductivity of the "tool-workepiece" contact, temperature and cutting force components, and cutting tool wear resistance).
{"title":"Efficiency of nanostructured wear-resistant coatings in high-speed turning of titanium alloys","authors":"M. Migranov, A. Gusev, A. Migranov, D. S. Repin, N. V. Kolosova","doi":"10.36652/1813-1336-2023-19-8-370-377","DOIUrl":"https://doi.org/10.36652/1813-1336-2023-19-8-370-377","url":null,"abstract":"The paper presents the results of experimental studies of tribological properties of innovative composite nanostructured wear-resistant coatings during high-speed turning of heat-resistant and heat-resistant steels and alloys, as well as temperature and force conditions, contact processes in the cutting zone based on the use of equipment and equipment for control and registration of electrophysical parameters that accompany the process of blade cutting (thermal EMF and electrical conductivity of the \"tool-workepiece\" contact, temperature and cutting force components, and cutting tool wear resistance).","PeriodicalId":178558,"journal":{"name":"Strengthening Technologies and Coatings","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128532016","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 : 1900-01-01DOI: 10.36652/1813-1336-2022-18-7-294-301
A. Lomakin, S. Bychkov, A. A. Kopylov
This article provides a comparative analysis of the output characteristics of a foreign proportional gas valve and a Russian prototype. The principle of operation of such a valve is considered. The plan of the experiment to study the effect of the anti-friction coating of molybdenum disulfide (MoS2) on the surface of the armature of an electromagnetic proportional gas valve made of alloy 16X-VI on the output characteristics of the valve is described in detail. The structural features and properties of the used MoS2 coating are described.
{"title":"Use of antifriction coating for improving of efficiency of miniature electromagnetic proportional valves. Part 1. Problem statement","authors":"A. Lomakin, S. Bychkov, A. A. Kopylov","doi":"10.36652/1813-1336-2022-18-7-294-301","DOIUrl":"https://doi.org/10.36652/1813-1336-2022-18-7-294-301","url":null,"abstract":"This article provides a comparative analysis of the output characteristics of a foreign proportional gas valve and a Russian prototype. The principle of operation of such a valve is considered. The plan of the experiment to study the effect of the anti-friction coating of molybdenum disulfide (MoS2) on the surface of the armature of an electromagnetic proportional gas valve made of alloy 16X-VI on the output characteristics of the valve is described in detail. The structural features and properties of the used MoS2 coating are described.","PeriodicalId":178558,"journal":{"name":"Strengthening Technologies and Coatings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128569217","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 : 1900-01-01DOI: 10.36652/1813-1336-2021-17-6-243-250
A. M. Dmitriev, N. Korobova
The distribution of microhardness in cylindrical samples formed from industrial iron-based powders and not subjected to sintering is experimentally studied. This distribution is described by a simple mathematical model. It is shown that the measured hardness has a significant correlation with the strength. Microhardness is correlated with the local strength. Because, during the subsequent sintering and heat treatment of the powder sample, phase transformations occur within the individual grains, the microhardness distribution that occurs before the sample is sintered will remain after sintering. The technology of microhardness equalization in the sample at the stage of its forming, before sintering, is described.
{"title":"Improving the uniformity of strength distribution in cylindrical specimens formed from iron based powders","authors":"A. M. Dmitriev, N. Korobova","doi":"10.36652/1813-1336-2021-17-6-243-250","DOIUrl":"https://doi.org/10.36652/1813-1336-2021-17-6-243-250","url":null,"abstract":"The distribution of microhardness in cylindrical samples formed from industrial iron-based powders and not subjected to sintering is experimentally studied. This distribution is described by a simple mathematical model. It is shown that the measured hardness has a significant correlation with the strength. Microhardness is correlated with the local strength. Because, during the subsequent sintering and heat treatment of the powder sample, phase transformations occur within the individual grains, the microhardness distribution that occurs before the sample is sintered will remain after sintering. The technology of microhardness equalization in the sample at the stage of its forming, before sintering, is described.","PeriodicalId":178558,"journal":{"name":"Strengthening Technologies and Coatings","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133550095","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 : 1900-01-01DOI: 10.36652/1813-1336-2022-18-10-470-476
D. Fominsky, M. Demin, M. Gritskevich, V. Kasyanenko, V.Yu. Fominsky
Reactive pulsed laser deposition was used to create solid lubricating coatings differing in the dimensions of MoSx and a-C(S,H) nanophases in the bulk of the coatings. For coating preparation, two deposition modes were used, including the co-deposition of Mo and C atomic fluxes in hydrogen sulfide and the successive deposition of Mo and C layers up to 12 nm thick in hydrogen sulfide. The two-phase composition of the coating formed by the co-deposition of Упрочняющие технологии и покрытия. 2022. Том 18, № 10 471 Strengthening technologies and coatings. 2022. Vol. 18, no. 10 УПРОЧНЯЮЩИЕ НАНОТЕХНОЛОГИИ atomic flows was recorded only by the method of micro-Raman spectroscopy. No fundamental difference in the tribological properties of these coatings was found during tests in humid and dry air, although some important differences in tribochemical processes on the surface of the coatings were revealed. The use of the technique of alternating deposition of thin layers of controlled thickness and composition opens more opportunities for controlling the nanostructure and phase composition of this type coatings than with the co-deposition of atomic flows. However, the successful implementation of the layer-by-layer deposition technique largely depends on the degree of adhesion between the nanolayers.
反应脉冲激光沉积技术用于制备固体润滑涂层，在大部分涂层中存在不同尺寸的MoSx和a-C(S,H)纳米相。为了制备涂层，采用了两种沉积模式，包括Mo和C原子通量在硫化氢中共沉积和Mo和C原子通量在硫化氢中连续沉积至12 nm厚的层。的两相组成的共沉积形成的涂层Упрочняющиетехнологииипокрытия。2022. Том 18，№10 471强化技术和涂层。2022. 第18卷，没有。10 УПРОЧНЯЮЩИЕ НАНОТЕХНОЛОГИИ原子流动仅用微拉曼光谱法记录。在潮湿和干燥空气中进行的测试中，这些涂层的摩擦学性能没有发现根本的差异，尽管涂层表面的摩擦学过程存在一些重要的差异。与原子流共沉积相比，控制厚度和成分的薄层交替沉积技术为控制这种类型涂层的纳米结构和相组成提供了更多的机会。然而，层接层沉积技术的成功实施在很大程度上取决于纳米层之间的粘附程度。
{"title":"Comparative study of tribological properties of nanocomposite and nanolayer coatings containing low-friction MoSx and solid a-C(S,H) components","authors":"D. Fominsky, M. Demin, M. Gritskevich, V. Kasyanenko, V.Yu. Fominsky","doi":"10.36652/1813-1336-2022-18-10-470-476","DOIUrl":"https://doi.org/10.36652/1813-1336-2022-18-10-470-476","url":null,"abstract":"Reactive pulsed laser deposition was used to create solid lubricating coatings differing in the dimensions of MoSx and a-C(S,H) nanophases in the bulk of the coatings. For coating preparation, two deposition modes were used, including the co-deposition of Mo and C atomic fluxes in hydrogen sulfide and the successive deposition of Mo and C layers up to 12 nm thick in hydrogen sulfide. The two-phase composition of the coating formed by the co-deposition of Упрочняющие технологии и покрытия. 2022. Том 18, № 10 471 Strengthening technologies and coatings. 2022. Vol. 18, no. 10 УПРОЧНЯЮЩИЕ НАНОТЕХНОЛОГИИ atomic flows was recorded only by the method of micro-Raman spectroscopy. No fundamental difference in the tribological properties of these coatings was found during tests in humid and dry air, although some important differences in tribochemical processes on the surface of the coatings were revealed. The use of the technique of alternating deposition of thin layers of controlled thickness and composition opens more opportunities for controlling the nanostructure and phase composition of this type coatings than with the co-deposition of atomic flows. However, the successful implementation of the layer-by-layer deposition technique largely depends on the degree of adhesion between the nanolayers.","PeriodicalId":178558,"journal":{"name":"Strengthening Technologies and Coatings","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126050032","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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