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| 1 | Analysis of Frequency Characteristics and Sensitivity of Compliant Mechanisms显示文摘Based on a modified pseudo-rigid-body model,the frequency characteristics and sensitivity of the large-deformation compliant mechanism are studied.Firstly,the pseudo-rigid-body model under the static and kinetic conditions is modified to enable the modified pseudo-rigid-body model to be more suitable for the dynamic analysis of the compliant mechanism.Subsequently,based on the modified pseudo-rigid-body model,the dynamic equations of the ordinary compliant four-bar mechanism are established using the analytical mechanics.Finally,in combination with the finite element analysis software ANSYS,the frequency characteristics and sensitivity of the compliant mechanism are analyzed by taking the compliant parallel-guiding mechanism and the compliant bistable mechanism as examples.From the simulation results,the dynamic characteristics of compliant mechanism are relatively sensitive to the structure size,section parameter,and characteristic parameter of material on mechanisms.The results could provide great theoretical significance and application values for the structural optimization of compliant mechanisms,the improvement of their dynamic properties and the expansion of their application range. | LIU Shanzeng DAI Jiansheng LI Aimin SUN Zhaopeng FENG Shizhe CAO Guohua | 2016 | Chinese Journal of Mechanical Engineering2016，29，4： | 5 |
| 2 | High-pressure phases of Weyl semimetals NbP, NbAs, TaP,and TaAs显示文摘In this study, we used the crystal structure search method and first-principles calculations to systematically explore the highpressure phase diagrams of the TaAs family(NbP, NbAs, TaP, and TaAs). Our calculation results show that NbAs and TaAs have similar phase diagrams, the same structural phase transition sequence I4_1 md→P6 m2→P2_1/c→Pm3 m, and slightly different transition pressures. The phase transition sequence of NbP and TaP differs somewhat from that of NbAs and TaAs, in which new structures emerge, such as the Cmcm structure in NbP and the Pmmn structure in TaP. Interestingly, we found that in the electronic structure of the high-pressure phase P6 m2-NbAs, there are coexistingWeyl points and triple degenerate points, similar to those found in high-pressure P6 m2-TaAs. | ZhaoPeng Guo PengChao Lu Tong Chen JueFei Wu Jian Sun DingYu Xing | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，3： | 2 |
| 3 | Improving Semantic Part Features for Person Re-identification with Supervised Non-local Similarity显示文摘In person re-IDentification (re-ID) task,the learning of part-level features benefits from fine-grained information.To facilitate part alignment,which is a prerequisite for learning part-level features,a popular approach is to detect semantic parts with the use of human parsing or pose estimation.Such methods of semantic partition do offer cues to good part alignment but are prone to noisy part detection,especially when they are employed in an off-the-shelf manner.In response,this paper proposes a novel part feature learning method for re-ID,that suppresses the impact of noisy semantic part detection through Supervised Non-local Similarity (SNS) learning.Given several detected semantic parts,SNS first locates their center points on the convolutional feature maps for use as a set of anchors and then evaluates the similarity values between these anchors and each pixel on the feature maps.The non-local similarity learning is supervised such that:each anchor should be similar to itself and simultaneously dissimilar to any other anchors,thus yielding the SNS.Finally,each anchor absorbs features from all of the similar pixels on the convolutional feature maps to generate a corresponding part feature (SNS feature).We evaluate our method with extensive experiments conducted under both holistic and partial re-ID scenarios.Experimental results confirm that SNS consistently improves re-ID accuracy using human parsing or pose estimation,and that our results are on par with state-of-the-art methods. | Yifan Sun Zhaopeng Dou Yali Li Shengjin Wang | 2020 | Tsinghua Science and Technology2020，25，5： | 2 |
| 4 | Evidence for a Dirac nodal-line semimetal in SrAs_3显示文摘Dirac nodal-line semimetals with the linear bands crossing along a line or loop, represent a new topological state of matter. Here, by carrying out magnetotransport measurements and performing first-principle calculations, we demonstrate that such a state has been realized in high-quality single crystals of SrAs_3.We obtain the nontrivial ∏ Berry phase by analysing the Shubnikov-de Haas quantum oscillations. We also observe a robust negative longitudinal magnetoresistance induced by the chiral anomaly.Accompanying first-principles calculations identifies that a single hole pocket enclosing the loop nodes is responsible for these observations. | Shichao Li Zhaopeng Guo Dongzhi Fu Xing-Chen Pan Jinghui Wang Kejing Ran Song Bao Zhen Ma Zhengwei Cai Rui Wang Rui Yu Jian Sun Fengqi Song Jinsheng Wen | 2018 | Science Bulletin2018，63，9： | 2 |
| 5 | Covalent organic framework containing dual redox centers as an efficient anode in Li-ion batteries显示文摘Covalent organic frameworks(COFs)with periodic channels and tunable chemical structures have been widely considered as promising electrode materials in rechargeable batteries.However,the design and construction of high-performance COFs-based electrodes still face some challenges in the introduction of multiple efficient redox centers as well as the reduction of dead mass.To address these issues,a unique COF containing double active centers(C═N and N═N)is developed as an anode in rechargeable lithium-ion batteries(LIBs).The as-prepared COF displays excellent electrochemical performance due to its remarkable structural stability and the existence of many active groups.Meanwhile,its electrochemical performance is significantly better than that of the small molecule compound or the linear polymer with the same construction units.Even at a high current density of 5 A/g,the LIBs with COF electrodes remain at a high discharge capacity of 227 mAh/g after 2000 cycles.Moreover,the distinction in electrochemical performances of these three materials is further revealed by calculation.This study illustrates the importance of molecular structure design for improving the performance of organic electrodes. | Yifan Tong Zhaopeng Sun Jiawen Wang Weiwei Huang Qichun Zhang | 2022 | SmartMat2022，3，4： | 2 |
| 6 | Determining dimensionalities and multiplicities of crystal nets显示文摘Low-dimensional materials have attracted significant attention over the past decade.To discover new low-dimensional materials,high-throughput screening methods for structures with target dimensionality have been applied in different materials databases.For this purpose,the reliability of dimensionality identification is therefore highly important.In this work,we find that the existence of self-penetrating nets may lead to incorrect results by previous methods.Instead of this,we use the quotient graph to analyse the topologies of structures and compute their dimensionalities. | Hao Gao Junjie Wang Zhaopeng Guo Jian Sun | 2020 | npj Computational Materials2020，，1： | 1 |
| 7 | In vitro assembly of the bacterial actin protein MamK from 'Candidatus Magnetobacterium casensis' in the phylum Nitrospirae显示文摘 | Aihua Deng Wei Lin Nana Shi Jie Wu Zhaopeng Sun Qinyun Sun Hua Bai Yongxin Pan Tingyi Wen | 2016 | Protein & Cell2016，7，4： | 1 |
| 8 | Conversion of CO_(2) and H_(2) into propane over InZrO_(x) and SSZ-13 composite catalyst显示文摘Direct converting carbon dioxide into hydrocarbon fuels and value-added chemicals would offer a very attractive approach for efficient utilization of CO_(2) as a carbon resource.Although,olefins,aromatics and gasoline have been successfully synthesized by CO_(2) hydrogenation,highly selective conversion of CO_(2) and H_(2) into C_(2+)hydrocarbon is still challenging due to a high C-C coupling barrier and inhibiting the production of other long-chain hydrocarbons.Here,we report a composite catalyst made of InZrO_(x) and SSZ-13 molecular sieve(InZrO_(x)+SSZ-13),which exhibits 74.5% propane selectivity at 623 K.The 8-MR micropores and the higher strength of the acid for SSZ-13 benefit the formation of propane.Compared with pure InO_(x) and m-ZrO_(2) the composite oxide InZrO_(x) containing more oxygen vacancies,exhibits to be more readily reduced by H_(2) and easier to adsorb and desorb CO_(2) within the reaction temperature.All those could be beneficial to the activation and conversion of H_(2) and CO_(2).The catalytic performance of InZrO_(x)+SSZ-13 in CO_(2) hydrogenation provides a potential for production of propane. | Zhaopeng Liu Youming Ni Tantan Sun Wenliang Zhu Zhongmin Liu | 2021 | Journal of Energy Chemistry2021，30，3： | 1 |
| 9 | Hierarchical Engineering for High-Energy-Oriented Sodium-Ion Batteries显示文摘CONSPECTUS:Sodium-ion batteries(SIBs)have obtained extensive attention as desirable candidates for smart grids and large-scale energy storage systems(ESSs)because they have the conspicuous advantages of resource abundance and competitive price.However,the biggish radius and heavier molar mass of Na^(+) and the lower negative redox potential of Na^(+)/Na give rise to low volumetric/gravimetric energy densities,sluggish reaction dynamics,and an inferior life-span.It is therefore crucial to concentrate on the development of tailored electrode materials with robust architectures and expedited Na+diffusion kinetics so as to take SIB energy systems one step closer to practical applications. | Pei Liu Haotian Yi Xuchun Chen Kunjie Zhu Zhaopeng Li Zhiqin Sun Lifang Jiao | 2022 | Accounts of Materials Research2022，3，7： | 0 |
| 10 | Unprotected quadratic band crossing points and quantum anomalous Hall effect in FeB_(2) monolayer显示文摘Quadratic band crossing points(QBCPs)and quantum anomalous Hall effect(QAHE)have attracted the attention of both theoretical and experimental researchers in recent years.Based on first-principle calculations,we find that the FeB_(2) monolayer is a nonmagnetic semimetal with QBCPs at K.Through symmetry analysis and k·p invariant theory,we find that the QBCP is not protected by rotation symmetry and consists of two Dirac points with the same chirality(Berry phase of 2π).Once introducing Coulomb interactions,we find that there is a spontaneous-time-reversal-breaking instability of the spinful QBCPs,which gives rise to a C=2 QAH insulator with orbital moment ordering. | DongYu Wu YunPeng Huang Song Sun JiaCheng Gao ZhaoPeng Guo HongMing Weng Zhong Fang Kun Jiang ZhiJun Wang | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，5： | 0 |
| 11 | Design and Grasping Force Modeling for a Soft Robotic Gripper with Multi-stem Twining显示文摘To improve the grasping power of soft robots,inspired by the scene of intertwined and interdependent vine branches safely clinging to habitats in a violent storm and the phenomenon of large grasping force after being entangled by aquatic plants,this paper proposes a soft robotic gripper with multi-stem twining.The proposed robotic gripper can realize a larger contact area of surrounding or containing object and more layers of a twining object than the current twining gripping methods.It not only retains the adaptive advantages of twining grasping but also improves the grasping force.First,based on the mechanical characteristics of the multi-stem twining of the gripper,the twining grasping model is developed.Then,the force on the fiber is deduced by using the twining theory,and the axial force of the gripper is analyzed based on the equivalent model of the rubber ring.Finally,the torsion experiments of fibers and the grasping experiments of the gripper are designed and conducted.The torsion experiment of fibers verifies the influence of a different number of fiber ropes and fiber torque on the grasping force,and the grasping experiment reflects the large load of the gripper and the high adaptability and practicability under different tasks. | Yu Shan Yanzhi Zhao Hongnian Yu Changlei Pei Zhaopeng Jin Yue Sun | 2023 | Journal of Bionic Engineering2023，20，5： | 0 |
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