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Electro-elastic Fields of Piezoelectric Materials with An Elliptic Hole under Uniform Internal Shearing Forces

Chinese Journal of Mechanical Engineering 2013年第3期26卷 454-461页

作者： DU Yanliang liU Shuhong DUAN Shijie li yanqiang Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Department of Engineering Mechanics Shijiazhuang Tiedao University Department of Adult Education Shijiazhuang Tiedao University

The existing investigations on piezoelectric materials containing an elliptic hole mainly focus on remote uniform tensile loads. In order to have a better understanding of the fracture behavior of piezoelectric materials under different loading conditions, theoretical and numerical solutions are presented for an elliptic hole in transversely isotropic piezoelectric materials subjected to uniform internal shearing forces based on the complex potential approach. By solving ten variable linear equations, the analytical solutions inside and outside the hole satisfying the permeable electric boundary conditions are obtained. Taking PZT-4 ceramic into consideration, numerical results of electro-elastic fields along the edge of the hole and axes, and the electric displacements in the hole are presented. Comparison with stresses in transverse isotropic elastic materials shows that the hoop stress at the ends of major axis in two kinds of material equals zero for the various ratios of major to minor axis lengths; If the ratio is greater than 1, the hoop stress in piezoelectric materials is smaller than that in elastic materials, and if the ratio is smaller than 1, the hoop stress in piezoelectric materials is greater than that in elastic materials; When it is a circle hole, the shearing stress in two materials along axes is the same. The distribution of electric displacement components shows that the vertical electric displacement in the hole and along axes in the material is always zero though under the permeable electric boundary condition; The horizontal and vertical electric displacement components along the edge of the hole are symmetrical and antisymmetrical about horizontal axis, respectively. The stress and electric displacement distribution tends to zero at distances far from the elliptical hole, which conforms to the conclusion usually made on the basis of Saint-Venant’s principle. Unlike the existing work, uniform shearing forces acting on the edge of the hole, an

关键词： piezoelectric material elliptic hole permeable boundary condition electro-elastic fields internal shearing forces

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Interface Engineering and Anion Engineering of Mo-Based Heterogeneous Electrocatalysts for Hydrogen Evolution Reaction

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Energy & Environmental Materials 2023年第1期6卷 87-104页

作者： Zehao Yin Xuan liu Siru Chen Tingli Ma yanqiang li State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyPanjin CampusPanjin 124221China School of Material and Chemical Engineering Centre for Advanced Materials ResearchZhongyuan University of TechnologyZhengzhou 450007China Department of Materials Science and Engineering China Jiliang UniversityHangzhou 310018China Graduate School of life Science and Systems Engineering Kyushu Institute of TechnologyKitakyushu Fukuoka 808-0196Japan

Development and utilization of hydrogen energy is an effective way to achieve carbon neutrality,only hydrogen production through electrolytic water splitting meets the goal of zero carbon *** facilitate the large-scale commercialization of water splitting devices,the development of highly efficient and low-cost catalysts to reduce the energy consumption is ***_(2)has been regarded as a promising electrocatalyst to replace platinum in hydrogen evolution reaction due to its low price and unique 2D layered ***,the poor conductivity and inert basal planes of MoS_(2)limited its wide-spread ***,researches have demonstrated that the conductivity and active sites of MoS_(2)can be improved by heteroatoms doping or constructing of heterogeneous *** this review,the recent progress of Mo-based catalysts are summarized centered on MoS_(2)based on interface engineering and anion engineering,including MoS_(2)–MoO_(2),MoS_(2)–Mo_(2)C,MoS_(2)–MoN_(x),MoS_(2)–MoP,and MoS_(2)–MoSe_(2).The preparation method,structure,and performance of the catalysts are introduced and the possible mechanism behind the improved catalytic activity are revealed to give readers an overall comprehension on the progress of the Mo-based electrocatalysts for hydrogen evolution *** addition,an outlook on future opportunities and development directions of Mo-based catalysts are proposed to facilitate the development of Mo-based catalysts for hydrogen production.

关键词： electrocatalysis heterostructure hydrogen evolution reaction Mo-based catalysts

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Recent advances in non-π-conjugated nonlinear optical sulfates with deep-UV absorption edge

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Chinese Journal of Structural Chemistry 2023年第3期42卷 56-63页

作者： Xu Chen yanqiang li Junhua Luo Sangen Zhao College of Chemistry Fuzhou UniversityFuzhouFujian350108China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian350002China University of Chinese Academy of Sciences Beijing100049China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China FuzhouFujian350108China

Deep-ultraviolet(deep-UV)nonlinear optical(NLO)crystals are of current interest because they play an indis-pensable role in modern scientific *** these crystals was traditionally limited toπ-conjugated systems,such as borates and *** 2019,our group reported two non-π-conjugated sulfates as new sources of deep-UV NLO crystals for the first *** this mini review,we provide a comprehensive overview of the recent development of non-π-conjugated NLO sulfates with deep-UV absorption edge in aspect of synthesis methods,crystal structures,thermal stability,and optical ***,we conclude the crucial structure-property relationships,and further give some prospects for exploring non-π-conjugated NLO sulfates with deep-UV absorption edge with high thermal stability,enhanced second-order NLO effects,birefringence,*** believe that this mini review will not only facilitate researchers to design superior non-π-conjugated NLO sulfates with deep-UV absorption edge but also shed useful insights on the explorations of other non-π-conjugated deep-UV NLO crystal systems.

关键词： Crystal structures Structure-property relationships Deep-UV NLO crystals Sulfates

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Human motion prediction using optimized sliding window polynomial fitting and recursive least squares

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The Journal of China Universities of Posts and Telecommunications 2021年第3期28卷 76-85,110页

作者： li Qinghua Zhang Zhao Feng Chao Mu Yaqi You Yue li yanqiang School of Electronic and Information Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China School of Electrical Engineering and Automation Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Jinan Engineering Laboratory of Human-Machine Intelligent Cooperation Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Institute of Automation Qilu University of Technology(Shandong Academy of Sciences)Jinan 250101China

Human motion prediction is a critical issue in human-robot collaboration(HRC)*** order to reduce the local error caused by the limitation of the capture range and sampling frequency of the depth sensor,a hybrid human motion prediction algorithm,optimized sliding window polynomial fitting and recursive least squares(OSWPF-RLS)was *** OSWPF-RLS algorithm uses the human body joint data obtained under the HRC task as input,and uses recursive least squares(RLS)to predict the human movement trajectories within the time ***,the optimized sliding window polynomial fitting(OSWPF)is used to calculate the multi-step prediction value,and the increment of multi-step prediction value was appropriately *** results show that compared with the existing benchmark algorithms,the OSWPF-RLS algorithm improved the multi-step prediction accuracy of human motion and enhanced the ability to respond to different human movements.

关键词： human-robot collaboration(HRC) human motion prediction sliding window polynomial fitting(SWPF)algorithm recursive least squares(RLS) optimized sliding window polynomial fitting and recursive least squares(OSWPF-RLS)

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2D nanoplate assembled nitrogen doped hollow carbon sphere decorated with Fe3O4 as an efficient electrocatalyst for oxygen reduction reaction and Zn-air batteries

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Nano Research 2019年第11期12卷 2774-2780页

作者： yanqiang li Huiyong Huang Siru Chen Xin Yu Chao Wang Tingli Ma State Key Laboratory of Fine Chemicals School of Ptroleumn and Chemical Eninering Dalian Univrsity of Tehnologos Panjin CampusPanjin 124221China Graduate School of life Science and Systems Engineering Kyushu Institute of Technology 2-4 HibikinoWakamatsuKitakyushuFukuoka 808-0196Japan Center for Advanced Materials Research Zhongyuan University of TechnologyZhengzhou 450007China

Designing a highly efficient non-precious based oxygen reduction reaction(ORR)electrocatalyst is critical for the commercialization of various sustainable energy storage and conversion devices such as metal-air batteries and fuel ***,we report a convenient strategy to synthesis Fe3O4 embedded in N doped hollow carbon sphere(NHCS)for ***'s interesting is that the carbon microsphere is composed of two-dimensional(2D)nanoplate that could provide more exposed active *** usage of solid ZnO nanowires as zinc source is crucial to obtain this *** Fe3O4@NHCS-2 exhibits better catalytic activity and durability than the commercial PtC ***,it further displays high-performance of Zn-air batteries as a cathode electrocatalyst with a high-power density of 133 mW·cm^-2 and high specific capacity of 701 mA·h·g^-*** special hollow structure composed 2D nanoplate,high surface area,as well as synergistic effect between the high active Fe3O4 nanoparticles and N-doped matrix endows this outstanding catalytic *** work presented here can be easily extended to prepare metal compounds decorated carbon nanomaterials with special structure for a broad range of energy storage and conversion devices.

关键词： oxygen reduction reaction Zn-air battery Fe3O4 N doping hollow microsphere

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Microstructure evolution of immiscible alloy solidified under the effect of composite electric and magnetic fields

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Journal of Materials Science & Technology 2023年第31期162卷 247-259页

作者： yanqiang li Hongxiang Jiang Hao Sun lili Zhang Jie He Jiuzhou Zhao Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Solidification experiments were performed with Lead-Aluminum immiscible alloy under the effect of composite electric and magnetic fields(CEMFs).The results demonstrate that CEMFs not only decrease the size of minority phase particles(MPPs)but also promote a more uniform distribution of the MPPs.A theoretical model was built to describe the microstructure evolution during cooling the immiscible *** solidification process of Pb-0.4 wt.%Al alloy under the effect of the CEMFs was *** numerical results are well consistent with the experimental *** results demonstrate that CEMFs affect the solidification process through changing melt convection and the nucleation behavior of minority phase droplets(MPDs).On one hand,the CEMFs can inhibit the convection and lead to the homogeneous distribution of MPPs along the radial direction of the *** the other hand,the CEMFs can increase the nucleation driving force for the MPDs,which decreases the average radius of MPDs and boosts the formation of dispersed solidification *** research indicates that the application of CEMFs is a promising strategy for controlling the microstructure of immiscible alloys.

关键词： Phase separation Solidification Simulation Composite electric and magnetic fields

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Influence of rare earth cerium on the microstructures and performances of Al-Fe alloy

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Science China(Technological Sciences) 2023年第11期66卷 3317-3327页

作者： li ShiXin JIANG HongXiang li yanqiang ZHANG lili SUN Hao HE Jie JIANG HaiCang ZHAO JiuZhou Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Binzhou Institute of Technology Binzhou 256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology Binzhou 256606China

The effects of rare earth addition on the microstructures as well as the tensile performances and electrical conductivity of Al alloys have attracted increasing attention ***,little research has been carried out to investigate the influence of minor Ce(the Ce additive amount is below 0.1 wt.%).In this study,experiments have been performed to explore the effects of minor Ce on the microstructures as well as the tensile properties and the electrical conductivity of Al-Fe *** results demonstrate that minor rare earth Ce addition not only leads to the α-Al refinement and the modification of Al_(13)Fe_(4) minority phase,but also decreases the solid solubility of *** grain refinement induced by Ce addition has a negligible influence on the tensile strength and yield strength,while the ductility and conductivity can be simultaneously ascended by adding rare earth *** modification of Al_(13)Fe_(4) minority phase is responsible for the increment of ductility,and the diminution of Si solid solubility in the Al matrix leads to the increase of electrical *** work provides a strategy for concurrently improving the tensile performances and electrical conductivity of aluminum alloy.

关键词： aluminum alloy rare earth cerium microstructure conductivity property tensile performance

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Lattice confined Ru single sites in hollow Co_(9)S_(8)polyhedron triggering Co-S-Ru catalytic centers for rechargeable Zn-air battery

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Nano Research 2023年第5期16卷 6701-6709页

作者： Xuan liu Siru Chen Huicheng Wang Anmin liu Shizheng Wen liwei Mi yanqiang li School of Chemical Engineering Dalian University of TechnologyPanjin CampusPanjin 124221China School of Material and Chemical Engineering Center for Advanced Materials ResearchZhongyuan University of TechnologyZhengzhou 450007China School of Materials Science and Engineering North China University of Water Resources and Electric PowerZhengzhou 450045China School of Physics and Electronic Electrical Engineering Huaiyin Normal UniversityHuai’an 223300China

Single-atom catalysts with precise structure and tunable coordination nature provide opportunities for developing novel catalytic centers and understanding reaction ***,hollow Co_(9)S_(8)polyhedrons with lattice-confined Ru single atoms(Ru-Co_(9)S_(8))are ***-corrected scanning transmission electron microscopy and X-ray absorption spectroscopy verify the isolated Ru atoms are confined in Co_(9)S_(8)to form Co-S-Ru catalytic *** calculations indicate that the oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)energy barriers are extensively reduced,the d-band center of Co_(9)S_(8)downshifts from the Fermi level,therefore boosting the desorption of O-containing ***,the Ru-Co_(9)S_(8)exhibits an ultralow overpotential of 163 mV at 10 mA·cm^(−2)for OER and could catalyze a rechargeable Zn-air battery with a high-power density of 92.0 mW·cm^(−2).This work provides a promising approach for designing novel bifunctional catalytic active centers for energy conversion.

关键词： electrocatalysis single-atom catalysts lattice confinement bifunctional catalysts Zn-air battery

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Efficient fluorescence detection of a single neutral atom with low background in a microscopic optical dipole trap

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Science China(Physics,Mechanics & Astronomy) 2012年第9期55卷 1523-1528页

作者： GUO yanqiang li Gang ZHANG YanFeng ZHANG PengFei WANG JunMin ZHANG TianCai State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University Taiyuan 030006 China

A single cesium atom is trapped in a far-off-resonance optical dipole trap （FORT） from the magneto-optical trap （MOT） and directly imaged by using a charge-coupled device （CCD） camera. The binary single-atom steps and photon anti-bunching are observed by a photon-counting-based HBT system using fluorescence light. The average atom dwelling time in the FORT is about 9 s. To reduce the background noise in the detection procedure we employ a weak probe laser tuned to the D1 line to il- lurninate the single atom from the direction perpendicular to the large-numerical-aperture collimation system. The second or- der degree of coherence g（2）（r）=0.12_＋0.02 is obtained directly from the fluorescence light of the single atom without deducting the background. The background light has been suppressed to 10 counts per 50 ms, which is much lower compared with the reported results. The measured g（2）（r） is in good agreement with theoretical analysis. The system provides a simple and effi- cient method to manipulate and measure single neutral atoms, and opens a way to create an efficient controlled single-photon source.

关键词： magneto-optical trap (MOT) far-off-resonance optical dipole trap (FORT) single atom collisional blockade second- order correlation function

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A new 2D van der Waals material with air stability and in-plane anisotropy

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Chinese Journal of Structural Chemistry 2023年第7期42卷 9-13页

作者： Han Wang Jinyang liu Minjuan li yanqiang li Yang Zhou Wei liu Junhua Luo Sangen Zhao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou350007China College of Physics and Energy Fujian Normal UniversityFuzhou350117China

*** 2D van der Waals materials possess intriguing features[1],especially optically,such as high nonlinear optical responses[2],broadband spectral response[3],and accessible exciton effects[4].Unlike conventional 2D materials with in-plane isotropy,such as graphene and M0S_(2),2D van der Waals materials with in-plane anisotropic possess in-plane low symmetry structure,inducing the in-plane anisotropic physical ***,they can be easily moved to various substrates without lattice-matching problems.

关键词： properties. plane anisotropic

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