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Flow modification associated with mangrove trees in a macro-tidal flat, southern China

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Acta Oceanologica Sinica 2019年第2期38卷 1-10页

作者： Yang Chang yining chen Yan Li Second Institute of Oceanography Ministry of Natural Resources State Key Laboratory of Marine and Environmental Science Xiamen University

Limited studies have investigated the modification of tidal currents by mangrove trees. In particular, the impacts of mangrove trees on a vertical velocity profile remain unclear. An automatic system is developed to observe the vertical velocity profiles within a mangrove forest composed of artificially introduced Kandelia obovata located on the Ximen Island, the southern Zhejiang Province. The results reveal low flow velocities throughout the vertical profile within the mangrove forest. The vertical profile shows an overall decrease of the velocity with an increasing height above the bed. This pattern is due to the vertical increase of the drag force by the trunks and tree *** addition, the turbulent energy density also varies vertically, corresponding to the vertical structure of the mangrove trees. In comparison with the vertical structure of flows within bare mudflats(semi-logarithmic) and salt marshes(nearly J-shape), the mangrove trees are shown to have a considerable impact on the vertical velocity profile in different ways.

关键词： mangrove trees flow energy dissipation vertical structure

Global asymptotic stability in a pseudorabies virus model with age structure

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Infectious Disease Modelling 2023年第3期8卷 865-880页

作者： yining chen Yuhua Long Jianshe Yu College of Mathematics and Information Sciences Center for Applied MathematicsGuangzhou UniversityGuangzhou510006People's Republic of China

Pseudorabies is a highly contagious disease caused by pseudorabies virus(PRV)or suid herpesvirus 1(SuHV1),causing significant economic losses to the swine industry in countries where the disease *** this paper,we formulate an age structure model of pseudorabies virus that takes into account disease-related mortality and vertical *** find a threshold to determine the stability and existence of the *** show that there is always a globally asymptotically stable boundary equilibrium if and only if R_(02)1+q,the boundary equilibrium is unstable and there exists a unique disease-endemic equilibrium,which is globally asymptotically *** give detailed proofs of our theoretical results and numerical *** concluding re-marks are also provided.

关键词： Pseudorabies virus model Equilibrium Global stability Age structure

Fuzzy Torque Control of the Bionic Flexible Manipulator Actuated by Pneumatic Muscle Actuators

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Chinese Journal of Mechanical Engineering 2019年第5期32卷 80-94页

作者： Kai Liu yining chen Jiaqi Xu Yang Wu Yonghua Lu Dongbiao Zhao College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics

A bionic flexible manipulator driven by pneumatic muscle actuator(PMA)can better reflect the flexibility of the *** research on PMA mainly focuses on the modeling and control strategy of the pneumatic manipulator *** with traditional electro-hydraulic actuators,the structure of PMA is simple but possesses strong nonlinearity and flexibility,which leads to the difficulty in improving the control *** this paper,the configuration design of a bionic flexible manipulator is performed by human physiological map,the kinematic model of the mechanism is established,and the dynamics is analyzed by Lagrange method.A fuzzy torque control algorithm is designed based on the computed torque method,where the fuzzy control theory is *** hardware experimental system is *** the co-simulation contrast test on MATLAB and ADAMS,it is found that the fuzzy torque control algorithm has better tracking performance and higher tracking accuracy than the computed torque method,and is applied to the entity control *** experimental results show that the fuzzy torque algorithm can better control the trajectory tracking movement of the bionic flexible *** research proposes a fuzzy torque control algorithm which can compensate the error more effectively,and possesses the preferred trajectory tracking performance.

关键词： Pneumatic muscle actuator Bionic flexible manipulator Computed torque method Fuzzy torque control

Cation-Anion Redox Active Organic Complex for High Performance Aqueous Zinc Ion Battery

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Energy & Environmental Materials 2024年第1期7卷 60-67页

作者： Lilin Zhang yining chen Zongyuan Jiang Jingwei chen Cong Wei Wenzhuo Wu Shaohui Li Qun Xu School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450001China School of Materials Science and Engineering Ocean University of China Qingdao 266100China

Organic redox compounds are attractive cathode materials in aqueous zinc-ion batteries owing to their low cost,environmental friendliness,multiple-electron-transfer reactions,and resource ***,the realized energy density is constrained by the limited capacity and low ***,copper-tetracyanoquinodimethane(CuTCNQ),an organic charge-transfer complex is evaluated as a zinc-ion battery cathode owing to the good electron acceptation ability in the cyano groups that improves the voltage *** electrochemical activation,electrolyte optimization,and adoption of graphene-based separator,CuTCNQ-based aqueous zinc-ion batteries deliver much improved rate performance and cycling stability with anti-self-discharge *** structural evolution of CuTCNQ during discharge/charge are investigated by ex situ Fourier transform infra-red(FT-IR)spectra,ex situ X-ray photoelectron spectroscopy(XPS),and in situ ultraviolet visible spectroscopy(UV-vis),revealing reversible redox reactions in both cuprous cations(Cu^(+))and organic anions(TCNQ^(x-1)),thus delivering a high voltage output of 1.0 V and excellent discharge capacity of 158 mAh g^(-1).The remarkable electrochemical performance in Zn//CuTCNQ is ascribed to the strong inductive effect of cyano groups in CuTCNQ that elevated the voltage output and the graphene-modified separator that inhibited CuTCNQ dissolution and shuttle effect in aqueous electrolytes.

关键词： cathode materials cyano groups electrochemical activation organic charge-transfer complex zinc-ion battery

Rotation Control of a 3-DOF Parallel Mechanism Driven by Pneumatic Muscle Actuators

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第2期36卷 330-338页

作者： LIU Kai chen yining WU Yang XU Jiaqi WANG Yangwei GE Zhishang College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics

The pneumatic muscle actuator(PMA)has many advantages,such as good flexibility,high power/weight ratio,but its nonlinearity makes it difficult to build a static mathematical model with high precision.A new method is proposed to establish the model of *** concept of hybrid elastic modulus which is related to the static characteristic of PMA is put forward,and the energy conservation law is used to achieve the expression of the hybrid elastic modulus,which can be fitted out based on experimental data,and the model of PMA can be derived from this *** the same time,a 3-DOF parallel mechanism(a new bionic shoulder joint)driven by five PMAs is *** bionic shoulder joint adopts the structure of two antagonistic PMAs actualizing a rotation control and three PMAs controlling another two rotations to get better rotation *** kinematic and dynamic characteristics of the mechanism are analyzed and a new static model of PMA is used to control *** results demonstrate the effectiveness of this new static model.

关键词： pneumatic muscle actuator static mathematical model hybrid elastic modulus 3-DOF parallel mechanism

Transcriptome characterization and SSR discovery in Squaliobarbus curriculus

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Journal of Oceanology and Limnology 2019年第1期37卷 235-244页

作者： LI Caijuan TENG Teng SHEN Fanfan GUO Jinqiang chen yining ZHU Chuankun LING Qufei School of Biology and Basic Medical Sciences Soochow University School of Life Science Huaiyin Normal University

Squaliobarbus curriculus is a eurythermic ?sh found mainly in East Asia. The natural germplasm resources of this species, an organism of potential economic aquacultural importance, have recently been threatened by over?shing and habitat degradation. The objective of this study was to obtain functional genomic resources and candidate microsatellite markers for future genetic observation and germplasm protection of S. curriculus. Illumina paired-end sequencing generated over 22.20 million clean reads, which were assembled into 204 027 transcripts with an average length of 1 457 bp. A total of 112 570 protein-coding sequences(55.17%) were predicted, 111 934 of which had signi?cant matches in the NCBI nonredundant protein database. Overall, 60 450, 34 830, and 77 755 transcripts were assigned to Gene Ontology, Clusters of Orthologous Groups, and Eukaryotic Orthologous Groups categories, *** addition, 44 781 transcripts(21.95%) were mapped to 230 KEGG pathways. A total of 51 426 candidate simple sequence repeat(SSR) markers were identi?ed and used to design 36 149 PCR primer pairs. Fifty of these primer pairs were randomly selected for PCR validation in 32 S. curriculus specimens, which resulted in 25 pairs yielding the expected products. Further analysis revealed that 40%(10) of the 25 ampli?ed loci were polymorphic. The transcriptomic pro?le and SSR repertoire obtained in this study should facilitate population genetic studies and germplasm resource protection of S. curriculus.

关键词： Squaliobarbus curriculus transcriptome sequencing SSR markers

Bletilla striata polysaccharide modified collagen fiber composite sponge with rapid hemostasis function

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Journal of Leather Science and Engineering 2022年第1期4卷 61-75页

作者： Xingyu Yan yining chen Weihua Dan Nianhua Dan Zhengjun Li Department of Biomass Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China National Engineering Research Center of Clean Technology in Leather Industry Sichuan UniversityChengdu 610065People’s Republic of China The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan UniversityChengdu 610065People’s Republic of China.

Emergencies often result in uncontrollable bleeding, which is thought to be the leading cause of death at the scene of the injured. Among various hemostasis scenarios, collagen fiber (CF) is gradually replacing traditional hemostatic materials due to its superior properties and ease of sourcing from animals. Herein, we use CF and the natural herba-ceous Bletilla striata as raw materials to prepare a collagen fiber-oxidized Bletilla striata composite hemostatic sponge (CFOB). During the cross-linking process, the triple helix structure of collagen stays intact, and its porous three- dimensional network structure brings excellent bulkiness and water absorption properties. Experiments show that the optimal amount of sponge CFOB-10, namely oxidized Bletilla striata polysaccharide 0.5 mg/mL and CF 5 mg/mL, only needed 25 ± 4.06 s for hemostasis time in the rat liver hemorrhage model. In addition, CFOB meets the safety performance requirements of cytotoxicity classification standard 0. Therefore, the optimal amount of CFOB is an excel-lent new hemostatic material with application potential.

关键词： Wound hemostasis Collagen fiber Bletilla striata polysaccharide

Vertical,capacitive microelectromechanical switches produced via direct writing of copper wires

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Microsystems & Nanoengineering 2016年第1期2卷 249-255页

作者： Zhiran Yi Jianjun Guo yining chen Haiqing Zhang Shuai Zhang Gaojie Xu Minfeng Yu Ping Cui Zhejiang Key Laboratory of Additive Manufacturing Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China D.Guggenheim School of Aerospace Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123China

Three-dimensional(3D)direct writing based on the meniscus-confined electrodeposition of copper metal wires was used in this study to develop vertical capacitive microelectromechanical *** microelectromechanical switches reduce the form factor and increase the area density of such devices in integrated *** studied the electromechanical characteristics of such vertical switches by exploring the dependence of switching voltage on various device structures,particularly with regard to the length,wire diameter,and the distance between the two wires.A simple model was found to match the experimental measurements made in this *** found that the electrodeposited copper microwires exhibit a good elastic modulus close to that of bulk *** optimizing the 3D structure of the electrodes,a volatile electromechanical switch with a sub-5 V switching voltage was demonstrated in a vertical microscale switch with a gap distance as small as 100 nm created with a pair of copper wires with diameters of~1μm and heights of 25μ*** study establishes an innovative approach to construct microelectromechanical systems with arbitrary 3D microwire structures for various applications,including the demonstrated volatile and nonvolatile microswitches.

关键词： microelectromechanical switch direct writing copper microwire

Soft-HGRNs:soft hierarchical graph recurrent networks for multi-agent partially observable environments

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Frontiers of Information Technology & Electronic Engineering 2023年第1期24卷 117-130页

作者： Yixiang REN Zhenhui YE yining chen Xiaohong JIANG Guanghua SONG School of Aeronautics and Astronautics Zhejiang UniversityHangzhou 310027China College of Computer Science and Technology Zhejiang UniversityHangzhou 310027China

The recent progress in multi-agent deep reinforcement learning(MADRL)makes it more practical in real-world tasks,but its relatively poor scalability and the partially observable constraint raise more challenges for its performance and *** on our intuitive observation that human society could be regarded as a large-scale partially observable environment,where everyone has the functions of communicating with neighbors and remembering his/her own experience,we propose a novel network structure called the hierarchical graph recurrent network(HGRN)for multi-agent cooperation under partial ***,we construct the multiagent system as a graph,use a novel graph convolution structure to achieve communication between heterogeneous neighboring agents,and adopt a recurrent unit to enable agents to record historical *** encourage exploration and improve robustness,we design a maximum-entropy learning method that can learn stochastic policies of a configurable target action *** on the above technologies,we propose a value-based MADRL algorithm called Soft-HGRN and its actor-critic variant called *** results based on three homogeneous tasks and one heterogeneous environment not only show that our approach achieves clear improvements compared with four MADRL baselines,but also demonstrate the interpretability,scalability,and transferability of the proposed model.

关键词： Deep reinforcement learning Graph-based communication Maximum-entropy learning Partial observability Heterogeneous settings