THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019最新文献

{"title":"Effect of neutron irradiation embrittlement on cyclic hardening behavior of core shroud assembly in pressurized water reactor under beyond-design basis earthquake","authors":"J. S. Kim, Jun-Min Seo, Yun‐Jae Kim, Young In Choi, C. Oh, Yong Beum Kim","doi":"10.1063/1.5140306","DOIUrl":"https://doi.org/10.1063/1.5140306","url":null,"abstract":"This paper presents investigation results on effect of neutron irradiation embrittlement on cyclic hardening behavior of core shroud assembly in pressurized water reactor under beyond-design basis earthquake (BDBE). In order to simulate the cyclic hardening behavior considering the neutron irradiation embrittlement, the previous user subroutines developed for monotonic hardening behavior were updated based on some cyclic hardening test results of irradiation-simulated specimens. Finite element (FE) elastic-plastic seismic analysis was performed by using Chaboche combined hardening models considering cyclic hardening or cyclic softening and a bi-linear kinematic hardening model. As a result, it is found that the bi-linear kinematic hardening model derived the most conservative results, and the Chaboche combined hardening model considering cyclic softening derived the analysis results close to those of the bi-linear kinematic hardening model. In addition, variation of the FE elastic-plastic seismic analysis results vs. neutron irradiation dose was investigated using the bi-linear kinematic hardening model. Finally, it is identified that von-Mises effective stress and plastic strain energy increase and equivalent plastic strain decreases with increasing the neutron irradiation dose.This paper presents investigation results on effect of neutron irradiation embrittlement on cyclic hardening behavior of core shroud assembly in pressurized water reactor under beyond-design basis earthquake (BDBE). In order to simulate the cyclic hardening behavior considering the neutron irradiation embrittlement, the previous user subroutines developed for monotonic hardening behavior were updated based on some cyclic hardening test results of irradiation-simulated specimens. Finite element (FE) elastic-plastic seismic analysis was performed by using Chaboche combined hardening models considering cyclic hardening or cyclic softening and a bi-linear kinematic hardening model. As a result, it is found that the bi-linear kinematic hardening model derived the most conservative results, and the Chaboche combined hardening model considering cyclic softening derived the analysis results close to those of the bi-linear kinematic hardening model. In addition, variation of the FE elastic-plastic seismic analysis...","PeriodicalId":130539,"journal":{"name":"THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129506872","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}

{"title":"A new method for the determination of molecular diffusion coefficient in polymer films by simple UV-VIS spectroscopy","authors":"P. Lova, Heba Meghad, D. Comoretto","doi":"10.1063/1.5140283","DOIUrl":"https://doi.org/10.1063/1.5140283","url":null,"abstract":"The possibility to evaluate molecular diffusion coefficient in polymer films directly in-situ is critical to assess barrier properties of packaging systems. Using the polymer packaging itself as smart sensor could lead to increase shelf-life, minimize wastes, and food poisoning effects. In this work we report on a new method that exploit simple UV-Vis spectroscopy to identify diffusion of small molecules in the vapor phase through both commercial polymer packaging systems and into polymer multilayered structures. The new method allows to determine molecular diffusion coefficient values in full agreement with gravimetric data reported in literature.The possibility to evaluate molecular diffusion coefficient in polymer films directly in-situ is critical to assess barrier properties of packaging systems. Using the polymer packaging itself as smart sensor could lead to increase shelf-life, minimize wastes, and food poisoning effects. In this work we report on a new method that exploit simple UV-Vis spectroscopy to identify diffusion of small molecules in the vapor phase through both commercial polymer packaging systems and into polymer multilayered structures. The new method allows to determine molecular diffusion coefficient values in full agreement with gravimetric data reported in literature.","PeriodicalId":130539,"journal":{"name":"THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132614372","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}

{"title":"In-line characterization of pultruded profiles","authors":"E. Barkanov, P. Akishin, E. Namsone, A. Bondarchuk, N. Pantelelis","doi":"10.1063/1.5140276","DOIUrl":"https://doi.org/10.1063/1.5140276","url":null,"abstract":"For in-line characterization of pultruded profiles, two alternative ANSYS based finite element modelling approaches using the same continuous model with lumped material properties for the cured composite are developed, compared and discussed. The first procedure is developed in ANSYS Mechanical environment and based on the mixed time integration scheme and nodal control volumes method. The second procedure is performed by using ANSYS CFX software with the cure reaction introduced as an additional variable. Validation of the developed algorithms is realized by the analysis of pultrusion process for the rod profile controlled in-line by new cure sensors measuring the temperature and electrical resistivity of the resin on the profile surface.For in-line characterization of pultruded profiles, two alternative ANSYS based finite element modelling approaches using the same continuous model with lumped material properties for the cured composite are developed, compared and discussed. The first procedure is developed in ANSYS Mechanical environment and based on the mixed time integration scheme and nodal control volumes method. The second procedure is performed by using ANSYS CFX software with the cure reaction introduced as an additional variable. Validation of the developed algorithms is realized by the analysis of pultrusion process for the rod profile controlled in-line by new cure sensors measuring the temperature and electrical resistivity of the resin on the profile surface.","PeriodicalId":130539,"journal":{"name":"THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019","volume":"325 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132902974","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}

{"title":"Modelling of the micro-bond test for mechanical analysis of the fibre/matrix interphase in fibre reinforced plastics","authors":"A. Martone, S. Iacono, A. Zamani, M. Lepore, L. Sanguigno, A. Maligno, E. Amendola","doi":"10.1063/1.5140314","DOIUrl":"https://doi.org/10.1063/1.5140314","url":null,"abstract":"The micro-bond test quantifies the interfacial shear strength (IFSS) providing essential information to estimate the failure conditions of fiber-reinforced plastics. The work focuses on achieving a micromechanical understanding of the microbond test, which involves pulling a fiber out of a bead of matrix (i.e. droplet) through a knife-edge, in order to quantify the interfacial fracture properties of fiber-reinforced composites. The micro drop pull-out test is simulated using fracture mechanics concepts under the framework of the finite element (FE) analysis. The FE model takes into account the real elliptical geometry of the droplet as well, as the frictional contact during the detaching due to fracture of fibre/matrix interface. The finite element simulation is carried out using ABAQUS software, the predicted force-displacement curves and IFSS are consistent with those measured by the micro-bond test.The micro-bond test quantifies the interfacial shear strength (IFSS) providing essential information to estimate the failure conditions of fiber-reinforced plastics. The work focuses on achieving a micromechanical understanding of the microbond test, which involves pulling a fiber out of a bead of matrix (i.e. droplet) through a knife-edge, in order to quantify the interfacial fracture properties of fiber-reinforced composites. The micro drop pull-out test is simulated using fracture mechanics concepts under the framework of the finite element (FE) analysis. The FE model takes into account the real elliptical geometry of the droplet as well, as the frictional contact during the detaching due to fracture of fibre/matrix interface. The finite element simulation is carried out using ABAQUS software, the predicted force-displacement curves and IFSS are consistent with those measured by the micro-bond test.","PeriodicalId":130539,"journal":{"name":"THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123152807","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}

{"title":"Study of some mechanical properties of Dammar matrix reinforced with hemp fabrics composites","authors":"G. Jiga, M. Stănescu, D. Bolcu","doi":"10.1063/1.5140279","DOIUrl":"https://doi.org/10.1063/1.5140279","url":null,"abstract":"In the last decades a great attention is paid to bio-composites due to their low cost and renewability. Until now, mostly natural fiber reinforced composites with a synthetic resin matrix have been studied. Composites with natural matrix were less studied. In this paper, some mechanical properties of composite materials with Dammar matrix with a reinforcement consisting in hemp fabrics have been studied. More specifically, the authors studied four types of resins where Dammar was the major component, its volume ratio varying between 50% and 80%. From each type of resin different composites were performed using as reinforcement two types of hemp fabrics. Based on tensile tests, the stress-strain curves and elastic or mechanical properties such as elastic modulus, ultimate tensile strength and breaking elongation were determined.In the last decades a great attention is paid to bio-composites due to their low cost and renewability. Until now, mostly natural fiber reinforced composites with a synthetic resin matrix have been studied. Composites with natural matrix were less studied. In this paper, some mechanical properties of composite materials with Dammar matrix with a reinforcement consisting in hemp fabrics have been studied. More specifically, the authors studied four types of resins where Dammar was the major component, its volume ratio varying between 50% and 80%. From each type of resin different composites were performed using as reinforcement two types of hemp fabrics. Based on tensile tests, the stress-strain curves and elastic or mechanical properties such as elastic modulus, ultimate tensile strength and breaking elongation were determined.","PeriodicalId":130539,"journal":{"name":"THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127871120","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}

{"title":"Functional and smart materials by electrospinning for advanced applications","authors":"M. Raisch, D. Genovese, G. Fornaia, N. Zaccheroni, Simon B. Schmidt, M. L. Focarete, M. Sommer, C. Gualandi","doi":"10.1063/1.5140289","DOIUrl":"https://doi.org/10.1063/1.5140289","url":null,"abstract":"The processing of advanced and functional polymers with electrospinning brings enormous potentialities to either improve or extend their properties. A representative example is the field of mechanochromic materials, potentially exploitable for imaging mechanical damages and stress/strain distribution. An effective stress-sensing material must respond to low deformation with a detectable color change that should be quickly reversible upon force unloading. In the present study we processed a spiropyran main chain polymer by electrospinning and fibers with a proper weaving were included in a PDMS elastomeric matrix to produce composite materials. Measurements of fiber birefringence demonstrated that, after electrospinning, polymer chains were successfully vitrified in a highly oriented conformation. Stress strain tests, coupled with a real-time detection of color, showed that fibers displayed a clear color change after only 5% of deformation. When these highly sensitive mechanochromic nanofibers were incorporated in a PDMS matrix, either anisotropic or isotropic mechanochromic behavior was achieved, depending on fiber alignment. The unique mechanochromic properties of the proposed composites, i.e. reversibility, sensitivity and directionality, derive by a smart combination of chemical synthesis, processing and composite design, respectively, and make them ideal to act as real-time stress/strain-sensing materials.The processing of advanced and functional polymers with electrospinning brings enormous potentialities to either improve or extend their properties. A representative example is the field of mechanochromic materials, potentially exploitable for imaging mechanical damages and stress/strain distribution. An effective stress-sensing material must respond to low deformation with a detectable color change that should be quickly reversible upon force unloading. In the present study we processed a spiropyran main chain polymer by electrospinning and fibers with a proper weaving were included in a PDMS elastomeric matrix to produce composite materials. Measurements of fiber birefringence demonstrated that, after electrospinning, polymer chains were successfully vitrified in a highly oriented conformation. Stress strain tests, coupled with a real-time detection of color, showed that fibers displayed a clear color change after only 5% of deformation. When these highly sensitive mechanochromic nanofibers were incorpo...","PeriodicalId":130539,"journal":{"name":"THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133769550","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}

{"title":"The mechanical behavior of dove tail profiled steel concrete composite shear walls under axial compression","authors":"Zhenfeng Huang, Zhixiong Sun, Sumei Zhang, Lanhui Guo","doi":"10.1063/1.5140294","DOIUrl":"https://doi.org/10.1063/1.5140294","url":null,"abstract":"This paper presents an experiment on the dove tail profiled steel concrete composite shear wall (DSCW) under axial compression. Four DSCWs specimens were designed and constructed in order to test and obtain the deformation behavior, failure modes, bearing capacity, stiffness changes, etc. The results indicate that the failure process of all 4 specimens is initialed from steel sheets local buckling to the final concrete crushing. The steel and concrete can work consistently because the dove-tail-shaped ribs of the sheets have a good anchoring effect on the concrete. Based on the experiment result and analysis, a simplified formula for DSCWs was suggested to calculate the axial compressive strength with consideration of the influence of local buckling of steel sheets.This paper presents an experiment on the dove tail profiled steel concrete composite shear wall (DSCW) under axial compression. Four DSCWs specimens were designed and constructed in order to test and obtain the deformation behavior, failure modes, bearing capacity, stiffness changes, etc. The results indicate that the failure process of all 4 specimens is initialed from steel sheets local buckling to the final concrete crushing. The steel and concrete can work consistently because the dove-tail-shaped ribs of the sheets have a good anchoring effect on the concrete. Based on the experiment result and analysis, a simplified formula for DSCWs was suggested to calculate the axial compressive strength with consideration of the influence of local buckling of steel sheets.","PeriodicalId":130539,"journal":{"name":"THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117108904","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}

{"title":"Preliminary approach to the study of flexural fatigue behavior of low Tg carbon/epoxy laminates","authors":"A. D’Amore, R. Dell’Aversano, A. Califano","doi":"10.1063/1.5140315","DOIUrl":"https://doi.org/10.1063/1.5140315","url":null,"abstract":"The static strength of carbon/epoxy laminates with three different stacking sequence has been analyzed at different strain rates under three point flexural tests. The materials under study were low cost, low Tg carbon/epoxy laminates with nominal thickness of 1 mm obtained stacking four fabric 0/90 balanced prepregs. The Weibull distribution function was used to compare the data on statistical basis.Quasi–isotropic, cross-ply and angle ply laminates were tested and the strain dependence of static strength was accounted for in the framework of a phenomenological model for fatigue with the objective test the model reliability in predicting the fatigue life and residual strength under variable spectrum with block loadings characterized by different loading frequencies.Preliminary results show that the phenomenological approach can be suitably applied in a rather simple manner solving one of the most intricate tasks within the field of fatigue of composite materials. The research activity represents the last step to build up a software that under variable amplitude loadings comprehensively accounts simultaneously and cycle-by-cycle for the change in the loading ratio, R=σmin/σmax, the maximum applied stress, σmax, and the frequency of loading, f. Details of the approach and the physics behind it are briefly presented with a series of preliminary results.The static strength of carbon/epoxy laminates with three different stacking sequence has been analyzed at different strain rates under three point flexural tests. The materials under study were low cost, low Tg carbon/epoxy laminates with nominal thickness of 1 mm obtained stacking four fabric 0/90 balanced prepregs. The Weibull distribution function was used to compare the data on statistical basis.Quasi–isotropic, cross-ply and angle ply laminates were tested and the strain dependence of static strength was accounted for in the framework of a phenomenological model for fatigue with the objective test the model reliability in predicting the fatigue life and residual strength under variable spectrum with block loadings characterized by different loading frequencies.Preliminary results show that the phenomenological approach can be suitably applied in a rather simple manner solving one of the most intricate tasks within the field of fatigue of composite materials. The research activity represents the last ...","PeriodicalId":130539,"journal":{"name":"THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117283011","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}

{"title":"Improving durability of titanium for biomedical use by composite ceramic coatings","authors":"E. Tranquillo, Massimiliano Bononi, E. Colombini, R. Giovanardi, P. Veronesi, Federico Barrino, M. Catauro","doi":"10.1063/1.5140280","DOIUrl":"https://doi.org/10.1063/1.5140280","url":null,"abstract":"New composite ZrO2/SiO2 coatings on grade 4 titanium have been produced by the sol-gel synthesis and dip coating, in order to improve durability of the substrate. Mechanical testing by scratch test and nanoindentation allowed to identify the coatings with better adhesion, lower tendency to crack, stiffer, harder and with lower friction against diamond in dry sliding. Potentiodynamic polarization tests in Dulbecco’s phosphate-buffered saline solution were used to evaluate a possible extra corrosion protection imparted by the coatings to the already excellent corrosion resistance of the passivated grade 4 titanium substrate. The silica-containing coatings appeared to be the best tradeoff between the improvement of mechanical and corrosion resistance properties.New composite ZrO2/SiO2 coatings on grade 4 titanium have been produced by the sol-gel synthesis and dip coating, in order to improve durability of the substrate. Mechanical testing by scratch test and nanoindentation allowed to identify the coatings with better adhesion, lower tendency to crack, stiffer, harder and with lower friction against diamond in dry sliding. Potentiodynamic polarization tests in Dulbecco’s phosphate-buffered saline solution were used to evaluate a possible extra corrosion protection imparted by the coatings to the already excellent corrosion resistance of the passivated grade 4 titanium substrate. The silica-containing coatings appeared to be the best tradeoff between the improvement of mechanical and corrosion resistance properties.","PeriodicalId":130539,"journal":{"name":"THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115983269","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}

{"title":"Advances in polymer composites’ tribology","authors":"K. Friedrich","doi":"10.1063/1.5140274","DOIUrl":"https://doi.org/10.1063/1.5140274","url":null,"abstract":"This article briefs the special design principles of polymer composites for low friction and wear under sliding against smooth metallic counterparts. Based on these fundamental aspects, traditional applications of polymeric tribo-components in mechanical and automotive engineering are reviewed. A following chapter on special developments of tribo-components outlines (a) ways to achieve electrical conductivity of polymer bearings, (b) the enhancement of self-lubrication and self-healing potential in the polymer matrix, (c) additive manufacturing methods for friction and wear loaded polymer parts, and (d) the application and properties of high temperature polymer coatings.This article briefs the special design principles of polymer composites for low friction and wear under sliding against smooth metallic counterparts. Based on these fundamental aspects, traditional applications of polymeric tribo-components in mechanical and automotive engineering are reviewed. A following chapter on special developments of tribo-components outlines (a) ways to achieve electrical conductivity of polymer bearings, (b) the enhancement of self-lubrication and self-healing potential in the polymer matrix, (c) additive manufacturing methods for friction and wear loaded polymer parts, and (d) the application and properties of high temperature polymer coatings.","PeriodicalId":130539,"journal":{"name":"THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126417013","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}