The Experts below are selected from a list of 29568 Experts worldwide ranked by ideXlab platform
Zheng Liu - One of the best experts on this subject based on the ideXlab platform.
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measure point arrangement strategy for in service continuous girder bridge shm with consideration of Structural Robustness special issue of icast 2019
Journal of Intelligent Material Systems and Structures, 2021Co-Authors: Qiwen Jin, Zheng LiuAbstract:In-service bridges, under long-term service operational environment, are usually accompanied by different damage types. Traditional method for the measure point arrangement of in-service bridge SHM...
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Structural Robustness based shm point arrangement strategy for in service cable stayed bridge subjected to cable damage effect
2020 Asia-Pacific International Symposium on Advanced Reliability and Maintenance Modeling (APARM), 2020Co-Authors: Qiwen Jin, Zheng LiuAbstract:In-service bridge safety accidents occur occasionally, especially for the structures after a long-term service. One example is the cable-stayed bridge, a common high order statically indeterminate structure usually designed with multiple components. Affected by natural environment (e.g., temperature) and fatigue factor, the stay cable is more vulnerable to suffer different damage effects (e.g., corrosion) and should be monitored over time. However, a large number of Structural health monitoring (SHM) sensors are usually arranged with consideration of traditional methods (e.g., full-scale load test). A detailed analysis on the Structural Robustness of in-service bridge subjected to different damage effects is also urgently needed. The vulnerable part or component can then be located as SHM point for a long-term monitoring. As a part of a series of study, this study focuses on the Structural Robustness-based SHM point arrangement of in-service cable-stayed bridge subjected to cable failure. A general technical process of the SHM point arrangement strategy of in-service bridge is proposed firstly. The evaluation index of Structural Robustness and the typical characteristic of in-service bridge are introduced firstly. An in-service cable-stayed bridge is then taken as a case study. The finite element (FE) analysis model is established. A detailed comparison and verification is also performed with consideration of previous studies. This study indicates that a general similar trend can be observed for the Structural Robustness of in-service cable-stayed bridge. The elements with smaller Structural Robustness of the main girder of this kind of bridge are basically located around the cross section at auxiliary pier. The next is the cross section around the middle part of middle span and side span. Thus, the SHM point should be generally arranged at around the cross section at the auxiliary pier firstly, and the next is around the middle span and side span. Moreover, the longer stay cable should also be located as SHM point or at least be worthy of our attention. With consideration of financial funding factor and other specific requirements, a higher proportion of the elements of main girder and stay cable can be further arranged as the SHM points for a long-term monitoring. This study can make us a better understanding of the Structural Robustness of in-service cable-stayed bridge. The SHM point arrangement of this kind of bridge can be more targeted, and the number of SHM sensors can also be greatly reduced.
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in service bridge shm point arrangement with consideration of Structural Robustness
Journal of Civil Structural Health Monitoring, 2019Co-Authors: Qiwen Jin, Zheng LiuAbstract:To date, Structural health monitoring (SHM) has been used in several long-span bridges and even some middle-span bridges. Many monitoring sensors are usually arranged based on traditional Structural mechanical analysis, such as load tests and engineering experiences. Moreover, several studies have also been carried out to reduce the number of monitoring sensor deployments and improve the pertinence of monitoring sensor arrangements. One example is Structural Robustness analysis, which can be used to locate the vulnerable and weak parts of a bridge to determine the arrangement of SHM sensors. In this paper, a strain energy index is first proposed to evaluate Structural Robustness. The universal applicability of the evaluation index is also verified by energy principle, and then this index can be widely accepted for engineering applications. A theoretical numerical simulation of the Structural Robustness of a simply supported beam subjected to different damage effects is then carried out. Different damage locations, different damage degrees and different moving speeds are considered. With the consideration of the same Structural type, an in-service simply supported girder bridge is also presented as the verification case study. The bridge once experienced an explosion caused by a moving fireworks vehicle. The monitoring point arrangement based on load tests and engineering experiences can be verified to be highly consistent with the theoretical numerical simulation result. This study provides a method for the SHM point arrangement of this kind of bridge. The Structural Robustness strain energy evaluation index is also acceptable for other kinds of bridges. The inconvenience caused by traditional Structural analysis, such as the temporary closing of road traffic, can also be greatly reduced.
Chuanhui Huang - One of the best experts on this subject based on the ideXlab platform.
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coordination mode engineering in stacked nanosheet metal organic frameworks to enhance catalytic reactivity and Structural Robustness
Nature Communications, 2019Co-Authors: Chuanhui Huang, Juncai Dong, Lirong Zheng, Xiao Li, Kang Zhou, Xuezhi Qiao, Qian Song, Lan Zhang, Tie WangAbstract:Optimising the supported modes of atom or ion dispersal onto substrates, to synchronously integrate high reactivity and robust stability in catalytic conversion, is an important yet challenging area of research. Here, theoretical calculations first show that three-coordinated copper (Cu) sites have higher activity than four-, two- and one-coordinated sites. A site-selective etching method is then introduced to prepare a stacked-nanosheet metal–organic framework (MOF, CASFZU-1)-based catalyst with precisely controlled coordination number sites on its surface. The turnover frequency value of CASFZU-1 with three-coordinated Cu sites, for cycloaddition reaction of CO2 with epoxides, greatly exceed those of other catalysts reported to date. Five successive catalytic cycles reveal the superior stability of CASFZU-1 in the stacked-nanosheet structure. This study could form a basis for the rational design and construction of highly efficient and robust catalysts in the field of single-atom or ion catalysis. Engineering the coordination mode of atom or ion onto the substrate remains challenging. Here, guided by theoretical calculation, the authors prepare stacked-nanosheet MOF based catalyst with precisely controlled coordination sites on the surface and enhanced catalytic reactivity and Structural Robustness.
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coordination mode engineering in stacked nanosheet metal organic frameworks to enhance catalytic reactivity and Structural Robustness
Nature Communications, 2019Co-Authors: Chuanhui Huang, Juncai Dong, Lirong Zheng, Kang Zhou, Xuezhi Qiao, Weiming Sun, Zhenjie Xue, Cong Liu, Qian SongAbstract:Optimising the supported modes of atom or ion dispersal onto substrates, to synchronously integrate high reactivity and robust stability in catalytic conversion, is an important yet challenging area of research. Here, theoretical calculations first show that three-coordinated copper (Cu) sites have higher activity than four-, two- and one-coordinated sites. A site-selective etching method is then introduced to prepare a stacked-nanosheet metal-organic framework (MOF, CASFZU-1)-based catalyst with precisely controlled coordination number sites on its surface. The turnover frequency value of CASFZU-1 with three-coordinated Cu sites, for cycloaddition reaction of CO2 with epoxides, greatly exceed those of other catalysts reported to date. Five successive catalytic cycles reveal the superior stability of CASFZU-1 in the stacked-nanosheet structure. This study could form a basis for the rational design and construction of highly efficient and robust catalysts in the field of single-atom or ion catalysis.
Yuejin Tan - One of the best experts on this subject based on the ideXlab platform.
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enhancing Structural Robustness of scale free networks by information disturbance
Scientific Reports, 2017Co-Authors: Suoyi Tan, Zhong Liu, Yuejin TanAbstract:Many real-world systems can be described by scale-free networks with power-law degree distributions. Scale-free networks show a “robust yet fragile” feature due to their heterogeneous degree distributions. We propose to enhance the Structural Robustness of scale-free networks against intentional attacks by changing the displayed network structure information rather than modifying the network structure itself. We first introduce a simple mathematical model for attack information and investigate the impact of attack information on the Structural Robustness of scale-free networks. Both analytical and numerical results show that decreasing slightly the attack information perfection by information disturbance can dramatically enhance the Structural Robustness of scale-free networks. Then we propose an optimization model of disturbance strategies in which the cost constraint is considered. We analyze the optimal disturbance strategies and show an interesting but counterintuitive finding that disturbing “poor nodes” with low degrees preferentially is more effective than disturbing “rich nodes” with high degrees preferentially. We demonstrate the efficiency of our method by comparison with edge addition method and validate the feasibility of our method in two real-world critical infrastructure networks.
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Structural Robustness of combat networks of weapon system of systems based on the operation loop
International Journal of Systems Science, 2017Co-Authors: Yuejin Tan, Kewei Yang, Xiaoke ZhangAbstract:The Structural Robustness of the combat network of weapon system-of-systems CNWSOS has been widely used to characterise its operation ability and survivability in the integrated joint operations. In this paper, after introducing the concept of the operation loop, a directed CNWSOS network model is first put forward. Then, the directed natural connectivity, a new measure of the CNWSOS Robustness that extends the concept of natural connectivity to the directed combat networks, is proposed to provide both a definite physical meaning and a simple mathematical formulation. Last, the feasibility and effectiveness of the proposed Structural Robustness measure are demonstrated using both numerical experiments and an empirical case study. The directed natural connectivity facilitates a more sensitive and precise quantitative analysis of the Structural Robustness, which in turn provides useful insights for designing a more robust CNWSOS, including improving the accuracy of intelligence acquisition, enhancing the communication capabilities of weapon systems, and strengthening the capability of precision strikes.
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Structural Robustness of weighted complex networks based on natural connectivity
Chinese Physics Letters, 2013Co-Authors: Xiaoke Zhang, Yuejin Tan, Hongzhong DengAbstract:Natural connectivity has been recently proposed to efficiently characterize the Structural Robustness of complex networks. The natural connectivity, interpreted as the Helmholtz free energy of a network, can be derived from the graph spectrum. We extend the concept of natural connectivity to weighted complex networks, in which the weight represents the number of multiple edges. We prove that the weighted natural connectivity changes monotonically when the weights are increased or decreased. We investigate the influence of weight on the network Robustness within scenarios of weight changing and show that the weighted natural connectivity allows a precise quantitative analysis of the Structural Robustness for weighted complex networks.
Qiwen Jin - One of the best experts on this subject based on the ideXlab platform.
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measure point arrangement strategy for in service continuous girder bridge shm with consideration of Structural Robustness special issue of icast 2019
Journal of Intelligent Material Systems and Structures, 2021Co-Authors: Qiwen Jin, Zheng LiuAbstract:In-service bridges, under long-term service operational environment, are usually accompanied by different damage types. Traditional method for the measure point arrangement of in-service bridge SHM...
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Structural Robustness based shm point arrangement strategy for in service cable stayed bridge subjected to cable damage effect
2020 Asia-Pacific International Symposium on Advanced Reliability and Maintenance Modeling (APARM), 2020Co-Authors: Qiwen Jin, Zheng LiuAbstract:In-service bridge safety accidents occur occasionally, especially for the structures after a long-term service. One example is the cable-stayed bridge, a common high order statically indeterminate structure usually designed with multiple components. Affected by natural environment (e.g., temperature) and fatigue factor, the stay cable is more vulnerable to suffer different damage effects (e.g., corrosion) and should be monitored over time. However, a large number of Structural health monitoring (SHM) sensors are usually arranged with consideration of traditional methods (e.g., full-scale load test). A detailed analysis on the Structural Robustness of in-service bridge subjected to different damage effects is also urgently needed. The vulnerable part or component can then be located as SHM point for a long-term monitoring. As a part of a series of study, this study focuses on the Structural Robustness-based SHM point arrangement of in-service cable-stayed bridge subjected to cable failure. A general technical process of the SHM point arrangement strategy of in-service bridge is proposed firstly. The evaluation index of Structural Robustness and the typical characteristic of in-service bridge are introduced firstly. An in-service cable-stayed bridge is then taken as a case study. The finite element (FE) analysis model is established. A detailed comparison and verification is also performed with consideration of previous studies. This study indicates that a general similar trend can be observed for the Structural Robustness of in-service cable-stayed bridge. The elements with smaller Structural Robustness of the main girder of this kind of bridge are basically located around the cross section at auxiliary pier. The next is the cross section around the middle part of middle span and side span. Thus, the SHM point should be generally arranged at around the cross section at the auxiliary pier firstly, and the next is around the middle span and side span. Moreover, the longer stay cable should also be located as SHM point or at least be worthy of our attention. With consideration of financial funding factor and other specific requirements, a higher proportion of the elements of main girder and stay cable can be further arranged as the SHM points for a long-term monitoring. This study can make us a better understanding of the Structural Robustness of in-service cable-stayed bridge. The SHM point arrangement of this kind of bridge can be more targeted, and the number of SHM sensors can also be greatly reduced.
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in service bridge shm point arrangement with consideration of Structural Robustness
Journal of Civil Structural Health Monitoring, 2019Co-Authors: Qiwen Jin, Zheng LiuAbstract:To date, Structural health monitoring (SHM) has been used in several long-span bridges and even some middle-span bridges. Many monitoring sensors are usually arranged based on traditional Structural mechanical analysis, such as load tests and engineering experiences. Moreover, several studies have also been carried out to reduce the number of monitoring sensor deployments and improve the pertinence of monitoring sensor arrangements. One example is Structural Robustness analysis, which can be used to locate the vulnerable and weak parts of a bridge to determine the arrangement of SHM sensors. In this paper, a strain energy index is first proposed to evaluate Structural Robustness. The universal applicability of the evaluation index is also verified by energy principle, and then this index can be widely accepted for engineering applications. A theoretical numerical simulation of the Structural Robustness of a simply supported beam subjected to different damage effects is then carried out. Different damage locations, different damage degrees and different moving speeds are considered. With the consideration of the same Structural type, an in-service simply supported girder bridge is also presented as the verification case study. The bridge once experienced an explosion caused by a moving fireworks vehicle. The monitoring point arrangement based on load tests and engineering experiences can be verified to be highly consistent with the theoretical numerical simulation result. This study provides a method for the SHM point arrangement of this kind of bridge. The Structural Robustness strain energy evaluation index is also acceptable for other kinds of bridges. The inconvenience caused by traditional Structural analysis, such as the temporary closing of road traffic, can also be greatly reduced.
Qian Song - One of the best experts on this subject based on the ideXlab platform.
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coordination mode engineering in stacked nanosheet metal organic frameworks to enhance catalytic reactivity and Structural Robustness
Nature Communications, 2019Co-Authors: Chuanhui Huang, Juncai Dong, Lirong Zheng, Xiao Li, Kang Zhou, Xuezhi Qiao, Qian Song, Lan Zhang, Tie WangAbstract:Optimising the supported modes of atom or ion dispersal onto substrates, to synchronously integrate high reactivity and robust stability in catalytic conversion, is an important yet challenging area of research. Here, theoretical calculations first show that three-coordinated copper (Cu) sites have higher activity than four-, two- and one-coordinated sites. A site-selective etching method is then introduced to prepare a stacked-nanosheet metal–organic framework (MOF, CASFZU-1)-based catalyst with precisely controlled coordination number sites on its surface. The turnover frequency value of CASFZU-1 with three-coordinated Cu sites, for cycloaddition reaction of CO2 with epoxides, greatly exceed those of other catalysts reported to date. Five successive catalytic cycles reveal the superior stability of CASFZU-1 in the stacked-nanosheet structure. This study could form a basis for the rational design and construction of highly efficient and robust catalysts in the field of single-atom or ion catalysis. Engineering the coordination mode of atom or ion onto the substrate remains challenging. Here, guided by theoretical calculation, the authors prepare stacked-nanosheet MOF based catalyst with precisely controlled coordination sites on the surface and enhanced catalytic reactivity and Structural Robustness.
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coordination mode engineering in stacked nanosheet metal organic frameworks to enhance catalytic reactivity and Structural Robustness
Nature Communications, 2019Co-Authors: Chuanhui Huang, Juncai Dong, Lirong Zheng, Kang Zhou, Xuezhi Qiao, Weiming Sun, Zhenjie Xue, Cong Liu, Qian SongAbstract:Optimising the supported modes of atom or ion dispersal onto substrates, to synchronously integrate high reactivity and robust stability in catalytic conversion, is an important yet challenging area of research. Here, theoretical calculations first show that three-coordinated copper (Cu) sites have higher activity than four-, two- and one-coordinated sites. A site-selective etching method is then introduced to prepare a stacked-nanosheet metal-organic framework (MOF, CASFZU-1)-based catalyst with precisely controlled coordination number sites on its surface. The turnover frequency value of CASFZU-1 with three-coordinated Cu sites, for cycloaddition reaction of CO2 with epoxides, greatly exceed those of other catalysts reported to date. Five successive catalytic cycles reveal the superior stability of CASFZU-1 in the stacked-nanosheet structure. This study could form a basis for the rational design and construction of highly efficient and robust catalysts in the field of single-atom or ion catalysis.
