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| 1 | Topology optimization of plate structures using plate element-based moving morphable component(MMC)approach显示文摘A topology optimization approach for designing the layout of plate structures is proposed in this article.In this approach,structural mechanical behavior is analyzed under the framework of Kirchhoff plate theory,and structural topology is described explicitly by a set of moving morphable components.Compared to the existing treatments where structural topology is generally described in an implicit manner,the adopted explicit geometry/layout description has demonstrated its advantages on several aspects.Firstly,the number of design variables is reduced substantially.Secondly,the obtained optimized designs are pure black-and-white and contain no gray regions.Besides,numerical experiments show that the use of Kirchhoff plate element helps save 95-99%computational time,compared with traditional treatments where solid elements are used for finite element analysis.Moreover the accuracy of the proposed method is also validated through a comparison with the corresponding theoretical solutions.Several numerical examples are also provided to demonstrate the effectiveness of the proposed approach. | Tianchen Cui Zhi Sun Chang Liu Linyuan Li Ronghua Cui Xu Guo | 2020 | Acta Mechanica Sinica2020，36，2： | 4 |
| 2 | Exploring the design space of immersive urban analytics显示文摘Recent years have witnessed the rapid development and wide adoption of immersive head-mounted devices,such as HTC VIVE,Oculus Rift,and Microsoft HoloLens.These immersive devices have the potential to significantly extend the methodology of urban visual analytics by providing critical 3D context information and creating a sense of presence.In this paper,we propose a theoretical model to characterize the visualizations in immersive urban analytics.Furthermore,based on our comprehensive and concise model,we contribute a typology of combination methods of 2D and 3D visualizations that distinguishes between linked views,embedded views,and mixed views.We also propose a supporting guideline to assist users in selecting a proper view under certain circumstances by considering visual geometry and spatial distribution of the 2D and 3D visualizations.Finally,based on existing work,possible future research opportunities are explored and discussed. | Zhutian Chen Yifang Wang Tianchen Sun Xiang Gao Wei Chen Zhigeng Pan Huamin Qu Yingcai Wu | 2017 | Visual Informatics2017，1，2： | 3 |
| 3 | An Optimization Approach for Stiffener Layout of Composite Stiffened Panels Based on Moving Morphable Components(MMCs)显示文摘An explicit topology optimization method for the stiffener layout of composite stiffened panels is proposed based on moving morphable components(MMCs).The skin and stiffeners are considered as panels with different bending stiffnesses,with the use of equivalent stiffness method.Then the location and geometric properties of composite stiffeners are determined by several MMCs to perform topology optimization,which can greatly simplify the finite element model.With the objective of maximizing structural stiffness,several typical cases with various loading and boundary conditions are selected as numerical examples to demonstrate the proposed method.The numerical examples illustrate that the proposed method can provide clear stiffener layout and explicit geometry information,which is not limited within the framework of parameter and size optimization.The mechanical properties of composite stiffened panels can be fully enhanced. | Zhi Sun Ronghua Cui Tianchen Cui Chang Liu Shanshan Shi Xu Guo | 2020 | Acta Mechanica Solida Sinica2020，33，5： | 2 |
| 4 | Explicit Topology Optimization with Moving Morphable Component(MMC)Introduction Mechanism显示文摘In this article,an explicit topology optimization approach with components-growing ability is proposed under the moving morphable component(MMC)framework.In this approach,the shape and topology layout of structures are explicitly optimized by growth evolution of moving morphable components.To this end,a competition criterion is developed to optimize the structural layout from two options:adding several new components or changing the current layout.In addition,some numerical technqiues are also developed to preserve the stability of the iterative process.The present topology optimization approach allows rational generation of new components and does not require a specific distribution of components in the initial design,which is compulsory for the conventional MMC method.Three numerical examples are provided to illustrate the effectiveness of the proposed method.The optimization results indicate that the proposed method does have the potential to improve the existing MMC-based explicit topology optimization framework by eliminating the initial design dependency of optimal solutions. | Tianchen Cni Zongliang Du Chang Liu Zhi Sun Xu Guo | 2022 | Acta Mechanica Solida Sinica2022，35，3： | 2 |
| 5 | Detecting the lead–lag effect in stock markets:definition,patterns,and investment strategies显示文摘Human activities widely exhibit a power-law distribution.Considering stock trading as a typical human activity in the financial domain,the first aim of this paper is to validate whether the well-known power-law distribution can be observed in this activity.Interestingly,this paper determines that the number of accumulated lead–lag days between stock pairs meets the power-law distribution in both the U.S.and Chinese stock markets based on 10 years of trading data.Based on this finding this paper adopts the power-law distribution to formally define the lead–lag effect,detect stock pairs with the lead–lag effect,and then design a pure lead–lag investment strategy as well as enhancement investment strategies by integrating the lead–lag strategy into classic alpha-factor strategies.Tests conducted on 20 different alpha-factor strategies demonstrate that both perform better than the selected benchmark strategy and that the lead–lag strategy provides useful signals that significantly improve the performance of basic alpha-factor strategies.Our results therefore indicate that the lead–lag effect may provide effective information for designing more profitable investment strategies. | Yongli Li Tianchen Wang Baiqing Sun Chao Liu | 2022 | Financial Innovation2022，8，1： | 1 |
| 6 | Chinese Fetal Growth:A Multicenter Cohort Study Based on Fetal Ultrasound Measurements显示文摘Objective:To build a reference fetal growth chart for the Chinese population based on fetal ultrasound measurements.Methods:This was a multicenter,population-based retrospective cohort study.Longitudinal ultrasound measurement data were collected from 24 hospitals in 18 provinces of China from 1st September through 31st October of 2019.The estimated fetal weight(EFW)was calculated based on head circumference,abdominal circumference,and femur length using Hadlock formula 3.Fetal growth curves were estimated using a two-level linear regression model with cubic splines.All participants were divided into two groups:the northern group(n=5829)and the southern group(n=3246)based on the geographical division of China and male fetus group(n=4775)and female fetus group(n=4300)based on fetal gender.The EFW was compared by fetal gender and geographical group.All statistical models were adjusted for maternal sociodemographic characteristics.Results:A total of 9075 participants with 31,700 ultrasound measurement records were included in this study.Male fetuses demonstrated significantly larger EFW compared to female ones starting at 16 weeks of gestation and extending to delivery(global testP<0.01).The overall geographic difference in EFW was significant(global testP=0.03),and week-specific comparisons showed that the northern group had a greater EFW starting at 15 weeks of gestation and extending to 29 weeks of gestation,although this difference did not extend to the time of delivery.TheZ-score of EFW confirmed that our Chinese fetal growth charts differed from previously published standards.Conclusion:This study provides EFW and ultrasound biometric reference measurements for Chinese fetuses and reveals differences from other fetal growth charts.The chart is worth promoting in more regions of China but should be tested prudently before use. | Xiaoli Gong Tianchen Wu Xiaoli Wang Lizhen Zhang Yiping You Hongwei Wei Xifang Zuo Ying Zhou Xinli Xing Zhaoyan Meng Qi Lyu Zhaodong Liu Jian Zhang Liyan Hu Junnan Li Li Li Chulin Chen Chunyan Liu Guoqiang Sun Aiju Liu Jingsi Chen Yuan Lyu Yuan Wei Yangyu Zhao | 2023 | Maternal-Fetal Medicine2023，5，1： | 0 |
| 7 | Revealing the frequency-dependent oscillations in the nonlinear terahertz response induced by the Josephson current显示文摘Nonlinear responses of superconductors to intense terahertz radiation has been an active research frontier.Using terahertz pump-terahertz probe spectroscopy,we investigate the c-axis nonlinear optical response of a high-temperature superconducting cuprate.After excitation by a single-cycle terahertz pump pulse,the reflectivity of the probe pulse oscillates as the pump-probe delay is varied.Interestingly,the oscillatory central frequency scales linearly with the probe frequency,a fact widely overlooked in pump-probe experiments.By theoretically solving the nonlinear optical reflection problem on the interface,we show that our observation is well explained by the Josephson-type third-order nonlinear electrodynamics,together with the emission coefficient from inside the material into free space.The latter results in a strong enhancement of the emitted signal whose physical frequency is around the Josephson plasma edge.Our result offers a benchmark for and new insights into strong-field terahertz spectroscopy of related quantum materials. | Sijie Zhang Zhiyuan Sun Qiaomei Liu Zixiao Wang Qiong Wu Li Yue Shuxiang Xu Tianchen Hu Rongsheng Li Xinyu Zhou Jiayu Yuan Genda Gu Tao Dong Nanlin Wang | 2023 | National Science Review2023，10，11： | 0 |
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