Pub Date : 2023-01-01DOI: 10.1504/ijstructe.2023.134347
Shu mei Chen, Bai zhou Ma, Hui Huang, Chang lin Chen
In this paper, an energy recovery type self-sensing magnetorheological dampers (MRD) was proposed, using a damper nested in a piezoelectric ceramic (PZT) stack structure to achieve energy recovery and self-sensing. Firstly, the structure of the damper is designed rationally. Secondly, the MRD-based damping force model is established by combining the characteristics of the damper motion and the flow field distribution principle. Then the piezoelectric material modal is analysed to determine its structural dimensions. Next, a mathematical model of electromechanical coupling between the parallel piezoelectric stack and MRD is established, and the simulation model is established to provide a basis for the study of energy recovery and self-sensing performance. Finally, an experimental platform is built: when the external current is 1.2 A, the output damping force is 680 N, and the damper can achieve vibration energy recovery and output power of 0.43 W under the sinusoidal signal with excitation frequency of 5 Hz, and self-sensing of external vibration excitation through the piezoelectric stack output electrical signal.
{"title":"Design and performance analysis of energy recovery and self-sensing MR dampers based on piezoelectric effect","authors":"Shu mei Chen, Bai zhou Ma, Hui Huang, Chang lin Chen","doi":"10.1504/ijstructe.2023.134347","DOIUrl":"https://doi.org/10.1504/ijstructe.2023.134347","url":null,"abstract":"In this paper, an energy recovery type self-sensing magnetorheological dampers (MRD) was proposed, using a damper nested in a piezoelectric ceramic (PZT) stack structure to achieve energy recovery and self-sensing. Firstly, the structure of the damper is designed rationally. Secondly, the MRD-based damping force model is established by combining the characteristics of the damper motion and the flow field distribution principle. Then the piezoelectric material modal is analysed to determine its structural dimensions. Next, a mathematical model of electromechanical coupling between the parallel piezoelectric stack and MRD is established, and the simulation model is established to provide a basis for the study of energy recovery and self-sensing performance. Finally, an experimental platform is built: when the external current is 1.2 A, the output damping force is 680 N, and the damper can achieve vibration energy recovery and output power of 0.43 W under the sinusoidal signal with excitation frequency of 5 Hz, and self-sensing of external vibration excitation through the piezoelectric stack output electrical signal.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135051917","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":"Performance evaluation of phase change material enhanced prototype in different climate zones","authors":"N.D. Kaushika, Gopal Nandan, R.K. Tomar, Jaspal Singh","doi":"10.1504/ijstructe.2023.10059721","DOIUrl":"https://doi.org/10.1504/ijstructe.2023.10059721","url":null,"abstract":"","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136209897","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 : 2020-08-03DOI: 10.1504/ijstructe.2020.10030994
E. D. Mora, Jhon Jairo Aguirre, Jorge Luis Bone, Kléver Gastón Parra, R. Baquero
The presence of infill walls modifies the global structural response of frame buildings subjected to seismic loads. In evaluation studies, the stiffness of the structural elements and the mass of the building do not have great scattering; consequently, the variable to be analysed is the stiffness of the masonry. This investigation presents a process to determine a more realistic calibration of an existing building model using structural software and genetic algorithm programs made in Python 3 where the properties of the masonry were iterated to obtain modal periods similar to those obtained from ambient vibration tests. This programming can be freely downloaded and can be used in any optimisation case. The results highlighted the influence that non-structural masonry has over the overall behaviour of a building. It is also demonstrated that the use of a simplified macro model, with one spring that depicts the nonlinear performance of masonry, is an excellent option to address the limitations of commonly used software, as well as reducing processing time.
{"title":"Modelling and calibration of infill frame-buildings, using ambient vibration tests and genetic algorithms","authors":"E. D. Mora, Jhon Jairo Aguirre, Jorge Luis Bone, Kléver Gastón Parra, R. Baquero","doi":"10.1504/ijstructe.2020.10030994","DOIUrl":"https://doi.org/10.1504/ijstructe.2020.10030994","url":null,"abstract":"The presence of infill walls modifies the global structural response of frame buildings subjected to seismic loads. In evaluation studies, the stiffness of the structural elements and the mass of the building do not have great scattering; consequently, the variable to be analysed is the stiffness of the masonry. This investigation presents a process to determine a more realistic calibration of an existing building model using structural software and genetic algorithm programs made in Python 3 where the properties of the masonry were iterated to obtain modal periods similar to those obtained from ambient vibration tests. This programming can be freely downloaded and can be used in any optimisation case. The results highlighted the influence that non-structural masonry has over the overall behaviour of a building. It is also demonstrated that the use of a simplified macro model, with one spring that depicts the nonlinear performance of masonry, is an excellent option to address the limitations of commonly used software, as well as reducing processing time.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42507670","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 : 2020-08-03DOI: 10.1504/ijstructe.2020.10030997
Mustafa Batikha, Yara Mouna
In this research, the effects of imperfections in a steel plate shear wall (SPSW) used to strengthen a reinforced concrete (RC) frame were numerically examined using nonlinear finite element analysis. Three types of structures were analysed in this study: SPSW only, a one-story RC frame with an SPSW infill, and a multi-story RC frame with an SPSW. It was determined that the initial imperfections of a thin SPSW cause a dramatic reduction in the yield and ultimate capacity of the SPSW when analysed individually; however, the presence of RC boundary frame members addresses an important role in eliminating this reduction. In contrast, it was found that the SPSW prevents the shear cracking in the RC frame joints. Based on this point, a higher RC frame capacity together with high initial stiffness and ductility are registered when an SPSW is applied, and equations for estimating the system capacity were derived through this study.
{"title":"Seismic performance of reinforced concrete frame strengthened with an imperfect steel plate shear wall","authors":"Mustafa Batikha, Yara Mouna","doi":"10.1504/ijstructe.2020.10030997","DOIUrl":"https://doi.org/10.1504/ijstructe.2020.10030997","url":null,"abstract":"In this research, the effects of imperfections in a steel plate shear wall (SPSW) used to strengthen a reinforced concrete (RC) frame were numerically examined using nonlinear finite element analysis. Three types of structures were analysed in this study: SPSW only, a one-story RC frame with an SPSW infill, and a multi-story RC frame with an SPSW. It was determined that the initial imperfections of a thin SPSW cause a dramatic reduction in the yield and ultimate capacity of the SPSW when analysed individually; however, the presence of RC boundary frame members addresses an important role in eliminating this reduction. In contrast, it was found that the SPSW prevents the shear cracking in the RC frame joints. Based on this point, a higher RC frame capacity together with high initial stiffness and ductility are registered when an SPSW is applied, and equations for estimating the system capacity were derived through this study.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48741922","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 : 2020-05-18DOI: 10.1504/ijstructe.2020.10029529
S. Raiyani, P. Patel, S. D. Vora
The present study aims to evaluate the effectiveness of externally bonded stainless steel wire mesh (SSWM) in enhancing the shear strength of reinforced concrete (RC) flanged beams with T-shape cross-section. To identify appropriate SSWM as a strengthening material, tension test and bond test are performed on five locally available SSWM. An experimental investigation is conducted to study the behaviour of RC T-beams strengthened by externally bonded 40 × 32 type SSWM under transverse loading. Two beams are considered as control specimen, and four beams are externally strengthened by two different wrapping configurations. All beams are tested under the two-point loading until failure. Results of experimental investigation, in terms of cracking load, ultimate load, deflection, prove the effectiveness of SSWM in shear strengthening of beams. The numerical model of controlled and SSWM strengthened T-beam specimen is also developed using finite element based software ABAQUS to validate experimental results.
{"title":"Effectiveness of stainless steel wire mesh in shear strengthening of reinforced concrete flanged beam","authors":"S. Raiyani, P. Patel, S. D. Vora","doi":"10.1504/ijstructe.2020.10029529","DOIUrl":"https://doi.org/10.1504/ijstructe.2020.10029529","url":null,"abstract":"The present study aims to evaluate the effectiveness of externally bonded stainless steel wire mesh (SSWM) in enhancing the shear strength of reinforced concrete (RC) flanged beams with T-shape cross-section. To identify appropriate SSWM as a strengthening material, tension test and bond test are performed on five locally available SSWM. An experimental investigation is conducted to study the behaviour of RC T-beams strengthened by externally bonded 40 × 32 type SSWM under transverse loading. Two beams are considered as control specimen, and four beams are externally strengthened by two different wrapping configurations. All beams are tested under the two-point loading until failure. Results of experimental investigation, in terms of cracking load, ultimate load, deflection, prove the effectiveness of SSWM in shear strengthening of beams. The numerical model of controlled and SSWM strengthened T-beam specimen is also developed using finite element based software ABAQUS to validate experimental results.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45167290","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 : 2020-05-18DOI: 10.1504/ijstructe.2020.10029533
S. Hashemi, Saeid Javidi, M. Malakooti
In this paper, the behaviour of reinforced concrete (RC) elements has been studied and a new shear stress-strain (SS-S) model is proposed for RC deep beams. Timoshenko beam theory is applied to consider the effect of shear deformations in numerical models. To take into account, the effect of bar-concrete interaction, the deep beam is divided into several sub-elements, and individual degrees of freedom are assigned to bars, which allow them to act independently. Since SS-S model is highly sensitive to several factors, a numerical definition of RC deep beams' shear behaviour is presented after assessing the contribution of main effective parameters on RC element's shear behaviour. The mentioned model is a push curve which has three breaking points. Proposed SS-S model is composed of several mathematical equations which allows users to easily predict the shear behaviour of RC deep beams without dealing with complex and time-consuming calculations.
{"title":"Proposing a simplified and parametric numerical shear stress-strain model for RC deep beams","authors":"S. Hashemi, Saeid Javidi, M. Malakooti","doi":"10.1504/ijstructe.2020.10029533","DOIUrl":"https://doi.org/10.1504/ijstructe.2020.10029533","url":null,"abstract":"In this paper, the behaviour of reinforced concrete (RC) elements has been studied and a new shear stress-strain (SS-S) model is proposed for RC deep beams. Timoshenko beam theory is applied to consider the effect of shear deformations in numerical models. To take into account, the effect of bar-concrete interaction, the deep beam is divided into several sub-elements, and individual degrees of freedom are assigned to bars, which allow them to act independently. Since SS-S model is highly sensitive to several factors, a numerical definition of RC deep beams' shear behaviour is presented after assessing the contribution of main effective parameters on RC element's shear behaviour. The mentioned model is a push curve which has three breaking points. Proposed SS-S model is composed of several mathematical equations which allows users to easily predict the shear behaviour of RC deep beams without dealing with complex and time-consuming calculations.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48926081","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 : 2020-05-18DOI: 10.1504/ijstructe.2020.10029532
Seyed Hossein hosseini Lavasani, Rouzbeh Doroudi
This study focuses on the application of dampers installed in a structure to control the seismic responses of the building. Fuzzy logic controller is applied to estimate control force and voltage of ATMD and MR damper. To find out a suitable fuzzy logic controller which reduces the responses of structure, it is essential to tune membership functions, extract appropriate rule base. The dynamic parameters of TMD is very effective to decrease the responses of structure. The observer-teacher-learner-based optimisation (OTLBO) algorithm is used to optimise TMD parameters and fuzzy logic controller. The results show that the optimised models by this algorithm can effectively decrease the peak seismic response of the building.
{"title":"Meta heuristic active and semi-active control systems of high-rise building","authors":"Seyed Hossein hosseini Lavasani, Rouzbeh Doroudi","doi":"10.1504/ijstructe.2020.10029532","DOIUrl":"https://doi.org/10.1504/ijstructe.2020.10029532","url":null,"abstract":"This study focuses on the application of dampers installed in a structure to control the seismic responses of the building. Fuzzy logic controller is applied to estimate control force and voltage of ATMD and MR damper. To find out a suitable fuzzy logic controller which reduces the responses of structure, it is essential to tune membership functions, extract appropriate rule base. The dynamic parameters of TMD is very effective to decrease the responses of structure. The observer-teacher-learner-based optimisation (OTLBO) algorithm is used to optimise TMD parameters and fuzzy logic controller. The results show that the optimised models by this algorithm can effectively decrease the peak seismic response of the building.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45257823","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 : 2020-05-18DOI: 10.1504/ijstructe.2020.10029530
K. Vijay, M. Murmu
The bio-mineralisation method gives potential outcomes in the micro-structure of concrete by precipitating CaCO3 in concrete. Be that as it may, the micro-organisms need a supplement source for their better development in concrete. In this manner, calcium lactate is moreover included in the concrete as a supplement source for micro-organisms. It is imperative to know the impact of this calcium lactate and bacteria on the properties of concrete. In this study, an endeavour is made to know the impact of calcium lactate and Bacillus subtilis bacteria on properties of concrete. Results demonstrate that there is a decrement in the carbonation rate and improvement in the compressive strength. Scanning electron microscope analysis shows that the dense matrix is obtained in bacterial concrete as compared to the control mix. The significant findings of this examination affirm that the performance of concrete improved by adding calcium lactate and Bacillus subtilis bacteria into the concrete.
{"title":"Effect of calcium lactate and Bacillus subtilis bacteria on properties of concrete and self-healing of cracks","authors":"K. Vijay, M. Murmu","doi":"10.1504/ijstructe.2020.10029530","DOIUrl":"https://doi.org/10.1504/ijstructe.2020.10029530","url":null,"abstract":"The bio-mineralisation method gives potential outcomes in the micro-structure of concrete by precipitating CaCO3 in concrete. Be that as it may, the micro-organisms need a supplement source for their better development in concrete. In this manner, calcium lactate is moreover included in the concrete as a supplement source for micro-organisms. It is imperative to know the impact of this calcium lactate and bacteria on the properties of concrete. In this study, an endeavour is made to know the impact of calcium lactate and Bacillus subtilis bacteria on properties of concrete. Results demonstrate that there is a decrement in the carbonation rate and improvement in the compressive strength. Scanning electron microscope analysis shows that the dense matrix is obtained in bacterial concrete as compared to the control mix. The significant findings of this examination affirm that the performance of concrete improved by adding calcium lactate and Bacillus subtilis bacteria into the concrete.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43904434","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 : 2020-05-18DOI: 10.1504/ijstructe.2020.10029535
Z. Zou, K. Tee, W. Fang
In this paper, a novel steel-concrete composite structure namely partially filled steel box-concrete (PFSBC) is proposed for structures which are mainly subject to eccentrically loaded compressive force. The cross-section of this kind of structure is a hollow steel box, which is divided into two parts, with one of them filled with concrete. The static behaviour of PFSBC structures was studied by nonlinear finite element method (FEM) and laboratory tests. The nonlinear FEM analysis is focused on the parametric study of its bearing capacity under the action of eccentric load. It can be found from the study that concrete filling ratio (CFR) which is defined as the ratio of filled concrete area to the whole area of the steel box, and the slenderness of the member, besides the confinement coefficient, are the most important parameters that influence the bearing capacity of PFSBC. To calibrate the FEM results, two PFSBC specimens with different slenderness ratios were tested in the laboratory under the action of eccentric load, and the load-displacement curves were measured. The test results coincided highly with the FEM calculated bearing capacity and other mechanical responses, which indicates the correctness and accuracy of FEM calculation.
{"title":"Static behaviour of partially filled steel box-concrete subject to eccentric loading","authors":"Z. Zou, K. Tee, W. Fang","doi":"10.1504/ijstructe.2020.10029535","DOIUrl":"https://doi.org/10.1504/ijstructe.2020.10029535","url":null,"abstract":"In this paper, a novel steel-concrete composite structure namely partially filled steel box-concrete (PFSBC) is proposed for structures which are mainly subject to eccentrically loaded compressive force. The cross-section of this kind of structure is a hollow steel box, which is divided into two parts, with one of them filled with concrete. The static behaviour of PFSBC structures was studied by nonlinear finite element method (FEM) and laboratory tests. The nonlinear FEM analysis is focused on the parametric study of its bearing capacity under the action of eccentric load. It can be found from the study that concrete filling ratio (CFR) which is defined as the ratio of filled concrete area to the whole area of the steel box, and the slenderness of the member, besides the confinement coefficient, are the most important parameters that influence the bearing capacity of PFSBC. To calibrate the FEM results, two PFSBC specimens with different slenderness ratios were tested in the laboratory under the action of eccentric load, and the load-displacement curves were measured. The test results coincided highly with the FEM calculated bearing capacity and other mechanical responses, which indicates the correctness and accuracy of FEM calculation.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44144422","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 : 2020-03-03DOI: 10.1504/ijstructe.2020.10027285
Wafa Djebablah, M. S. Nouaouria, Souhila Adjabi
The geosynthetic technique of reinforcing retaining walls is one of the techniques that are currently being developed in the field of geotechnics. This article focuses on a numerical study, using two-dimensional finite difference Fast Lagrangian Analysis of Continua FLAC2D software, to investigate the influence of a uniform surcharge application on the behaviour of a geosynthetic-reinforced soil retaining wall, especially on the maximum tensile force and wall displacement at the end of construction. A parametric study was undertaken taking into account the surcharge load, the width and its distance from the continuous facing panel. The results show that the tensile forces in the reinforcement and the horizontal displacements of the facing panel increase with increasing the uniform surcharge. Furthermore, a small effect was noted on the maximum tensile force in the geosynthetic layers with varying the surcharge distance from the back of the facing panel.
{"title":"Numerical study of the behaviour of geosynthetic-reinforced soil retaining walls under a uniform surcharge","authors":"Wafa Djebablah, M. S. Nouaouria, Souhila Adjabi","doi":"10.1504/ijstructe.2020.10027285","DOIUrl":"https://doi.org/10.1504/ijstructe.2020.10027285","url":null,"abstract":"The geosynthetic technique of reinforcing retaining walls is one of the techniques that are currently being developed in the field of geotechnics. This article focuses on a numerical study, using two-dimensional finite difference Fast Lagrangian Analysis of Continua FLAC2D software, to investigate the influence of a uniform surcharge application on the behaviour of a geosynthetic-reinforced soil retaining wall, especially on the maximum tensile force and wall displacement at the end of construction. A parametric study was undertaken taking into account the surcharge load, the width and its distance from the continuous facing panel. The results show that the tensile forces in the reinforcement and the horizontal displacements of the facing panel increase with increasing the uniform surcharge. Furthermore, a small effect was noted on the maximum tensile force in the geosynthetic layers with varying the surcharge distance from the back of the facing panel.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43500992","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：