PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019最新文献

{"title":"Corrosion resistance of Fe-Cr-Ni-Mn-Mo-Ti steel produced by electron beam additive manufacturing with powder-cored wire and ferritic steel substrate","authors":"V. Utyaganova, K. Kalashnikov, N. Shamarin, N. Savchenko, V. Rubtsov","doi":"10.1063/1.5132245","DOIUrl":"https://doi.org/10.1063/1.5132245","url":null,"abstract":"To produce new materials with an additive manufacturing method the use of composition correction powder-cored wire is an attractive approach. In this article the powder-cored wire with high content of Fe, Cr, Ni, Mn, Mo alloying elements and Ti as stabilizing agent was used. The energy-dispersion analysis was used to determine the composition of the wire. Corrosion tests were carried out in FeCl3 solution to determine the resistance of the material against pitting corrosion. We also studied the influence of heat treatment on the corrosion resistance of the printed material. During the growth of the sample the powder-cored wire components are diluted within the deposited layer/substrate boundary and then redistributed during the high-temperature annealing thus having a negative effect on the corrosion resistance of the final product.To produce new materials with an additive manufacturing method the use of composition correction powder-cored wire is an attractive approach. In this article the powder-cored wire with high content of Fe, Cr, Ni, Mn, Mo alloying elements and Ti as stabilizing agent was used. The energy-dispersion analysis was used to determine the composition of the wire. Corrosion tests were carried out in FeCl3 solution to determine the resistance of the material against pitting corrosion. We also studied the influence of heat treatment on the corrosion resistance of the printed material. During the growth of the sample the powder-cored wire components are diluted within the deposited layer/substrate boundary and then redistributed during the high-temperature annealing thus having a negative effect on the corrosion resistance of the final product.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84418434","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":"Formation of the hierarchical porous structure and surface morphology in the micro-arc calcium phosphate coatings","authors":"E. Komarova, V. Chebodaeva, I. Khlusov, L. Litvinova, Y. Sharkeev","doi":"10.1063/1.5132034","DOIUrl":"https://doi.org/10.1063/1.5132034","url":null,"abstract":"The study of the formation of the hierarchically organized porous structure and surface morphology, as well as phase and elemental compositions of the calcium phosphate (CaP) coatings deposited by the micro-arc oxidation (MAO) method under varied applied voltage (200-300 V) was performed. The increase of the MAO voltage led to the linear increase of the coating thickness (50-100 µm), surface average roughness (3.0-7.5 µm), surface porosity (20-35%) and sizes of the structural elements (spheres and pores). In addition, the increase in the voltage led to the structural-phase transformation in the coatings from the amorphous state to the amorphous-crystalline state with incorporation of CaHPO4 and β-Ca2P2O7 phases. The elemental composition of the CaP coatings did not significantly depend on the applied voltage value, however, the Ca content and Ca/P atomic ratio increased with increasing of the voltage. Thus, the MAO technique allows to form on the metal substrate the CaP coatings with specific physicochemical, and structural properties influencing the behavior of stromal stem cells and bone tissue regeneration.The study of the formation of the hierarchically organized porous structure and surface morphology, as well as phase and elemental compositions of the calcium phosphate (CaP) coatings deposited by the micro-arc oxidation (MAO) method under varied applied voltage (200-300 V) was performed. The increase of the MAO voltage led to the linear increase of the coating thickness (50-100 µm), surface average roughness (3.0-7.5 µm), surface porosity (20-35%) and sizes of the structural elements (spheres and pores). In addition, the increase in the voltage led to the structural-phase transformation in the coatings from the amorphous state to the amorphous-crystalline state with incorporation of CaHPO4 and β-Ca2P2O7 phases. The elemental composition of the CaP coatings did not significantly depend on the applied voltage value, however, the Ca content and Ca/P atomic ratio increased with increasing of the voltage. Thus, the MAO technique allows to form on the metal substrate the CaP coatings with specific physicochemi...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86207591","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":"Structural changes and chemistry of petroleum macromolecular components during thermocatalytic processing","authors":"A. Akimov, N. Sviridenko, M. Morozov, S. Panin, V. Aleksenko, V. Vlasov, A. V. Vosmerikov","doi":"10.1063/1.5131874","DOIUrl":"https://doi.org/10.1063/1.5131874","url":null,"abstract":"The work is devoted to the study of high-molecular components (asphaltenes) of petroleum and its products. The relevance of research aimed at studying structural changes and the chemistry of thermocatalytic transformations of asphaltenes in the conditions of heavy residual feedstock processing processes increases every year. X-ray parameters (phase composition, structural characteristics), thermal stability and thermal effects were studied using the following methods: powder X-ray diffraction method, simultaneous thermal analysis combining the methods of thermogravimetry, differential scanning calorimetry and mass spectrometric analysis of gaseous products.The work is devoted to the study of high-molecular components (asphaltenes) of petroleum and its products. The relevance of research aimed at studying structural changes and the chemistry of thermocatalytic transformations of asphaltenes in the conditions of heavy residual feedstock processing processes increases every year. X-ray parameters (phase composition, structural characteristics), thermal stability and thermal effects were studied using the following methods: powder X-ray diffraction method, simultaneous thermal analysis combining the methods of thermogravimetry, differential scanning calorimetry and mass spectrometric analysis of gaseous products.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80416630","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":"Composition of asphaltenes of heavy oil residues from the Usinskoye oil field","authors":"T. V. Cheshkova, A. D. Arysheva, R. S. Min, T. Sagachenko","doi":"10.1063/1.5131921","DOIUrl":"https://doi.org/10.1063/1.5131921","url":null,"abstract":"A comparative study of the composition and structure of asphaltenic components of fuel oil and heavy naphthenic-aromatic oil is carried out. The similarities and differences of their structural-group composition, the composition of fragments bound in molecules of asphaltenes through ether and sulfide bridges are revealed. It is shown that the effect of temperature results in the lower content of compounds in the products of the C–S and C–O bond cleavage. The differences revealed are most likely due to the changes in molecular architecture of the initial asphaltenes. A comparative analysis of the compounds identified shows that most of them are bound through sulfide bridges. It can be assumed that most of the ether bridges located on the periphery of molecules of asphaltenes broke the first in the course of fuel oil production. Sulfide bonds are in the core of asphaltenes.A comparative study of the composition and structure of asphaltenic components of fuel oil and heavy naphthenic-aromatic oil is carried out. The similarities and differences of their structural-group composition, the composition of fragments bound in molecules of asphaltenes through ether and sulfide bridges are revealed. It is shown that the effect of temperature results in the lower content of compounds in the products of the C–S and C–O bond cleavage. The differences revealed are most likely due to the changes in molecular architecture of the initial asphaltenes. A comparative analysis of the compounds identified shows that most of them are bound through sulfide bridges. It can be assumed that most of the ether bridges located on the periphery of molecules of asphaltenes broke the first in the course of fuel oil production. Sulfide bonds are in the core of asphaltenes.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76626129","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":"Effect of feed speed on the quality of titanium-aluminum bimetal produced by friction stir welding","authors":"S. A. Ermakova, A. Eliseev, V. Rubtsov","doi":"10.1063/1.5131958","DOIUrl":"https://doi.org/10.1063/1.5131958","url":null,"abstract":"The paper investigates the features of bimetal formation from commercially pure titanium alloy and aluminum alloy 5056 using lap friction stir welding. The structure of bimetal and quality of joint depending on the change of tool feed rate is studied. Tensile tests were carried out to determine mechanical properties. The structure of bimetals was studied by methods of light optical and scanning electron microscopy. The results showed that the quality of titanium-aluminum bimetal in general is inversely proportional to the feed rate of the tool.The paper investigates the features of bimetal formation from commercially pure titanium alloy and aluminum alloy 5056 using lap friction stir welding. The structure of bimetal and quality of joint depending on the change of tool feed rate is studied. Tensile tests were carried out to determine mechanical properties. The structure of bimetals was studied by methods of light optical and scanning electron microscopy. The results showed that the quality of titanium-aluminum bimetal in general is inversely proportional to the feed rate of the tool.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72649489","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":"Effect of the acid GBK composition and reservoir microflora on the displacement efficiency and composition of the oil from the Usinskoye oilfield","authors":"A. G. Shcherbakova, V. S. Ovsyannikova, L. I. Svarovskaya, L. Altunina","doi":"10.1063/1.5132194","DOIUrl":"https://doi.org/10.1063/1.5132194","url":null,"abstract":"An acid composition based on an adduct of an inorganic acid, a polyol and a surfactant has been developed at the Institute of Petroleum Chemistry, SB RAS. The composition, which includes glycerin and urea, stimulates the growth and hydrocarbon-oxidizing activity of the reservoir microflora under conditions of simulated biodegradation and physical modeling of oil displacement process. Biodegradation results in an increase in the proportion of oxygen-containing and aromatic structures, while the proportion of cyclic hydrocarbons in the group composition has decreased. The changes in the molecular mass distribution of mono, bi- and triaromatic hydrocarbons were revealed. The combined use of the acid composition and the hydrocarbon-oxidizing microflora provided an increased displacement of oil from models of core samples with low and high permeability.An acid composition based on an adduct of an inorganic acid, a polyol and a surfactant has been developed at the Institute of Petroleum Chemistry, SB RAS. The composition, which includes glycerin and urea, stimulates the growth and hydrocarbon-oxidizing activity of the reservoir microflora under conditions of simulated biodegradation and physical modeling of oil displacement process. Biodegradation results in an increase in the proportion of oxygen-containing and aromatic structures, while the proportion of cyclic hydrocarbons in the group composition has decreased. The changes in the molecular mass distribution of mono, bi- and triaromatic hydrocarbons were revealed. The combined use of the acid composition and the hydrocarbon-oxidizing microflora provided an increased displacement of oil from models of core samples with low and high permeability.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79775272","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":"Influence of tribological interaction conditions on the material transfer process during adhesive friction between Al-alloy and high-speed tool steel","authors":"K. Kalashnikov, L. Zhukov, T. Kalashnikova","doi":"10.1063/1.5132016","DOIUrl":"https://doi.org/10.1063/1.5132016","url":null,"abstract":"In the present work, the study of sliding friction process of Aluminum alloy - steel pair was carried out in order to determine the influence of interaction conditions on the material transfer processes. The friction tests were carried out according to the “pin-on-disk” scheme, where tool steel T11302 was used as a pin, alloy AA5056 was used as a disk. The results of the study showed that the height of the transfer layer of aluminum alloy on the steel pin surface increases with the increase of normal load and movement speed. It is shown that the friction coefficient increases with the normal load. The movement speed does not affect the average value of the friction coefficient in any way.In the present work, the study of sliding friction process of Aluminum alloy - steel pair was carried out in order to determine the influence of interaction conditions on the material transfer processes. The friction tests were carried out according to the “pin-on-disk” scheme, where tool steel T11302 was used as a pin, alloy AA5056 was used as a disk. The results of the study showed that the height of the transfer layer of aluminum alloy on the steel pin surface increases with the increase of normal load and movement speed. It is shown that the friction coefficient increases with the normal load. The movement speed does not affect the average value of the friction coefficient in any way.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79616420","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":"Construction of interatomic potentials of V-W on the basis of CALPHAD data on the formation enthalpy","authors":"V. Maksimenko, A. Lipnitskii, I. Nelasov","doi":"10.1063/1.5132080","DOIUrl":"https://doi.org/10.1063/1.5132080","url":null,"abstract":"The problem of reliability of the prediction of alloy properties, which can be established from the results of atomistic simulations, is one of the factors constraining the integration of computer modeling into effective technologies for the development of new materials. The solution of this problem requires further development of methods for constructing interatomic potentials to improve the reliability of theoretical predictions, including the properties of materials at moderate and high temperatures. In this paper a new method for constructing interatomic potentials in binary systems is proposed. The method uses CALPHAD and experimental data on the formation enthalpies and lattice parameters, including characteristics at moderate and high temperatures. The new method is tested on the example of solid solutions of V-W system. The constructed V-W potentials predict the formation enthalpies and lattice parameters in good agreement with the known CALPHAD data at 2000 K and the results of experimental studies at 300 K, respectively. The new method can be applied to specify the interactions between atoms in multicomponent systems.The problem of reliability of the prediction of alloy properties, which can be established from the results of atomistic simulations, is one of the factors constraining the integration of computer modeling into effective technologies for the development of new materials. The solution of this problem requires further development of methods for constructing interatomic potentials to improve the reliability of theoretical predictions, including the properties of materials at moderate and high temperatures. In this paper a new method for constructing interatomic potentials in binary systems is proposed. The method uses CALPHAD and experimental data on the formation enthalpies and lattice parameters, including characteristics at moderate and high temperatures. The new method is tested on the example of solid solutions of V-W system. The constructed V-W potentials predict the formation enthalpies and lattice parameters in good agreement with the known CALPHAD data at 2000 K and the results of experimental studi...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77893224","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":"Multicomponent antifriction composites based on polyetheretherketone (PEEK) matrix","authors":"S. Panin, D. Nguyen, L. Kornienko, L. R. Ivanova","doi":"10.1063/1.5132134","DOIUrl":"https://doi.org/10.1063/1.5132134","url":null,"abstract":"Some mechanical and tribotechnical properties of perspective thermoplastic polyetheretherketone matrix (PEEK) based composites loaded with polytetrafluoroethylene (PTFE) and molybdenum disulfide (MoS2) microparticles under dry sliding friction conditions were investigated in order to find efficient combined solid lubricant filler. It is shown that polytetrafluoroethylene is an efficient solid lubricant for PEEK matrix (wear resistance of the composite increases by 8 times for metal–polymer tribo-pair, while it makes 15 times for ceramic–polymer friction pair). Simultaneous adding the molybdenum disulfide and PTFE particles with the content of the latter less than 0.5 wt % ensures maximum wear resistance of the composite while keeping the strength properties at the level of neat PEEK.Some mechanical and tribotechnical properties of perspective thermoplastic polyetheretherketone matrix (PEEK) based composites loaded with polytetrafluoroethylene (PTFE) and molybdenum disulfide (MoS2) microparticles under dry sliding friction conditions were investigated in order to find efficient combined solid lubricant filler. It is shown that polytetrafluoroethylene is an efficient solid lubricant for PEEK matrix (wear resistance of the composite increases by 8 times for metal–polymer tribo-pair, while it makes 15 times for ceramic–polymer friction pair). Simultaneous adding the molybdenum disulfide and PTFE particles with the content of the latter less than 0.5 wt % ensures maximum wear resistance of the composite while keeping the strength properties at the level of neat PEEK.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73157341","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":"Electronic structure of multiwalled carbon nanotubes with impurities and defects","authors":"A. Ponomarev, N. Bobenko, N. Melnikova","doi":"10.1063/1.5132149","DOIUrl":"https://doi.org/10.1063/1.5132149","url":null,"abstract":"The change in the density of electronic states (DOS) near the Fermi level induced by doping, ionic and thermal treatments, is studied. The model of band structure of multi-walled carbon nanotubes (MWCNTs) containing various types of defects, is constructed using experimental data of the DOS near the Fermi level. In the framework of the temperature Green functions method the expression for DOS near the Fermi level is received for MWCNTs of large diameter with impurities and structural defects of short-range order type. The results of theoretical investigations are in a good agreement with the experimental data. The phenomenon of gap opening or closing in the DOS is explained.The change in the density of electronic states (DOS) near the Fermi level induced by doping, ionic and thermal treatments, is studied. The model of band structure of multi-walled carbon nanotubes (MWCNTs) containing various types of defects, is constructed using experimental data of the DOS near the Fermi level. In the framework of the temperature Green functions method the expression for DOS near the Fermi level is received for MWCNTs of large diameter with impurities and structural defects of short-range order type. The results of theoretical investigations are in a good agreement with the experimental data. The phenomenon of gap opening or closing in the DOS is explained.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76159275","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}