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SSRN 2023年

作者： Ren, Yuanxin Xia, Jun Zeng, Sidong Song, Jinxi Huang, Guoxian Yang, Linhan Lv, Pingyu Fan, Di Tang, Xiaoya Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity College of Urban and Environmental Sciences Northwest University Xi’an710127 China Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing400714 China Chongqing School University of Chinese Academy of Sciences Chongqing400714 China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan430072 China Water-Environment Monitoring Center for the Upper Reach of Changjiang Changjiang Water Resource Commission Chongqing40021 China Chinese Research Academy of Environmental Sciences China

It is particularly important to determine the critical management areas for nitrogen (N) and phosphorus (P) losses in large-scale basins, which will effectively reduce costs and improve efficiency. In this study, the spatial and temporal characteristics of N and P losses in the Jialing River from 2000 to 2019 were calculated based on the SWAT model. The trends were analyzed by the Theil-Sen Median and Mann-Kendall methods. Getis-Ord Gi* was used to count the significant coldspots and hotspots to identify the priority of regional management and critical regions. The results indicated the range of annual average unit load losses for N and P in Jialing River were 1.21-54.53kg·ha-1 and 0.05-1.35 kg·ha-1, respectively. The interannual variation of both N and P losses showed decreasing trend with a rate of change of 0.327 and 0.003. N and P losses were highest in summer and lowest in winter. The coldspots for N loss were clustered in the northwest of the Upstream of Jialing and the north of Fujiang. The coldspots for P loss were clustered in the central, western, and northern of the Upstream Jialing River. The hotspots for N loss were clustered in the south of the Upstream of Jialing River, the central-western and southern of Fujiang, and the central of Qujiang. The hotspots for P loss were clustered in the south-central of the Upstream of Jialing River, the southern and northern of the Middle and Downstream of Jialing River, the western and southern of Fujiang, and the south of Qujiang. The coldspot and hotspot regions for N would change locally in spring and winter, and the coldspot and hotspot regions for P would change locally in summer and winter, respectively. Therefore, when developing management programs, managers should make specific adjustments to the critical regions for different pollutants according to seasonal characteristics. © 2023, The Authors. All rights reserved.

关键词： Phosphorus

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Research on the detection method of 500kV composite insulator's decay-like fracture

Research on the detection method of 500kV composite insulato...

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22nd International Symposium on High Voltage Engineering (ISH 2021)

作者： G. Pang Z. Zhang M. Lu C. Gao X. Jiang State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing People's Republic of China State Grid Henan Electric Power Research Institute State Grid Zhengzhou People's Republic of China

Composite insulators play an essential role in insulation and load-bearing in transmission lines, and their operating status directly affects the safety and stability of the power grid. This paper uses an insulator of decay-like fracture to measure the temperature and discharge under different conditions by visual inspection, ultraviolet detection, infrared detection, and electric field detection. Detailed morphology of the insulator of decay-like fracture is obtained. The results show that the deterioration of the sheath is considerably related to the surface contamination or leakage current. It is an effective method to determine the deterioration of composite insulators when the temperature and temperature rise of composite insulators are abnormal (for example, T>50°C, ΔT>30°C). Under DC conditions, the temperature rise and discharge are much lower than those of AC, indicating that the temperature rise of the insulator is mainly generated by dielectric loss heating caused by the polarization effect of the insulating dielectric under the impact of the alternating electric field. The measurement results are significantly affected by the test conditions. It isn't easy to judge whether composite insulators are fractured or not by using electric field distribution and UV measurement on site.

关键词： composite insulators dielectric losses discharges (electric) electric fields fracture infrared detectors inspection leakage currents polarisation power grids power transmission lines surface contamination ultraviolet detectors

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A comprehensive intention prediction method considering vehicle interaction 4

A comprehensive intention prediction method considering vehi...

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4th CAA International Conference on Vehicular Control and Intelligence, CVCI 2020

作者： Cai, Wenqi He, Ganglei Hu, Jianlong Zhao, Haiyan Wang, Yuhai Gao, Bingzhao Qingdao Legee Transmission System Technology Co. Ltd Qingdao China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China Qingdao Automotive Research Institute Jilin University Qingdao China

ISBN: (纸本)9781728184968

In this paper, an interactive intention prediction method is proposed. Firstly, the Hidden Markov Model integrated with Gaussian Mixture Model is modeled for current behavior recognition and its parameters are trained through NGSIM dataset. Then, a trajectory prediction method based on Frenet frame is used to predict the future traffic situation, considering which future behavior reasoning is realized by maximum expected utility theory. The final intention prediction result is a combination of historical trajectory recognition and future behavior reasoning. The simulation results show that the proposed method has the ability of reasonably reflecting the interaction process between vehicles and the prediction performance is good. © 2020 IEEE.

关键词： Hidden Markov models

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Large deformation and wrinkling analyses of bimodular structures and membranes based on a peridynamic computational framework

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Acta Mechanica Sinica 2019年第6期35卷 1226-1240页

作者： H.Li Y.G.Zheng Y.X.Zhang H.F.Ye H.W.Zhang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610200China International Research Center for Computational Mechanics State Key Laboratory of Structural Analysis for Industrial EquipmentDepartment of Engineering MechanicsFaculty of Vehicle Engineering and MechanicsDalian University of TechnologyDalian 116024China

In this paper,the quasi-static large deformation,wrinkling and fracture behaviors of bimodular structures and membranes are studied with an implicit bond-based peridynamic computational ***,the constant and tangential stiffness matrices of the implicit peridynamic formulations for the nonlinear problems are derived,*** former is con structed from the linearization of the bond strain on the basis of the geometric approximation while the latter is established according to the linearization of the pairwise force by using first-order Taylor’s ***,a bimodular material model in peridynamics is developed,in which the tensile or compressive behavior of the material at each point is conveniently described by the tensile or compressive states of the bonds in its ***,the bimodular material model is extended to deal with the wrinkling and fracture problems of membranes by setting the compressive micro-modulus to be *** addition,the incremental-iterative algorithm is adopted to obtain the convergent solutions of the nonlinear ***,several representative numerical examples are presented and the results demonstrate the accuracy and efficiency of the proposed method for the large deformation,wrinkling and fracture analyses of bimodular structures and membranes.

关键词： Bimodular structures Wrinkling membranes Fracture problems Peridynamics Implicit numerical algorithm

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Corrigendum: Biologically inspired swimming robotic frog based on pneumatic soft actuators (2020 Bioinspir. Biomim.15 046006)

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Bioinspiration & biomimetics 2022年第4期17卷 049501-049501页

作者： Jizhuang Fan Qilong Du Qingguo Yu Yi Wang Jiaming Qi Yanhe Zhu State Key Laboratory of Robotics and System Harbin Institute of Technology People's Republic of China.

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Cogging Force Identification Based on Self-Adaptive Hybrid Self-Learning TLBO Trained RBF Neural Network for Linear Motors 13

Cogging Force Identification Based on Self-Adaptive Hybrid S...

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13th International Symposium on Linear Drives for Industry Applications, LDIA 2021

作者： Fu, Xuewei Ding, Chenyang Zanchetta, Pericle Yang, Xiaofeng Tang, Mi Liu, Yang State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai China Academy for Engineering and Technology Fudan University Shanghai China Department of Electrical and Electronic Engineering University of Nottingham Nottingham United Kingdom Department of Electrical University of Pavia Pavia Italy Power Electronics Machine and Control Group University of Nottingham Nottingham United Kingdom Center of Ultra-Precision Optoelectronic Instrument Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)9781728172101

The cogging force arising due to the strong attraction forces between the iron core and the permanent magnets, is a common inherent property of the linear motors, which significantly affects the control performance. Therefore, significant research efforts have been devoted to the compensation of the cogging force. In this paper, an identification approach based on the radial basis function neural network (RBFNN) is proposed to obtain an accurate model of the cogging force. A self-adaptive hybrid self-learning teaching-learning-based optimization (SHSLTLBO) method is utilized to train the neural network. Finally, the experimental results confirm the effectiveness and the superiority of the proposed cogging force identification method. © 2021 IEEE

关键词： Radial basis function networks

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Three-Dimensional Numerical Simulation of Rime Ice Accumulation on Silicone Rubber Insulator and its Experimental Verification in the Natural Environment

SSRN

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SSRN 2022年

作者： Liu, Zongyuan Hu, Yuyao Jiang, Xingliang Wu, Ying Chi, Mingchen Han, Feiyan Wang, Xiaolei College of Electrical and Electronic Engineering Shandong University of Technology Zhangdian District Zibo255000 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Shapingba District Chongqing400044 China State Grid Weifang Hanting Electric Power Company Hanting District Weifang261100 China Shandong Huineng Electric Co. Ltd. Zibo255089 China

Icing on transmission lines is a challenging problem in the world. Rime icing on silicone rubber insulator was taken as research object in this paper. Based on the theories of computational fluid dynamics and collision dynamics, the position coordinates of supercooled water droplets collided with the surface of the insulator were extracted, the local collision coefficient (E) of the droplet was calculated by triangular area ratio method. The effectiveness of the method was verified by actual rime icing distribution. An ice shape reconstruction algorithm was proposed to realize three-dimensional numerical simulation of rime ice accretion on the insulator. Results show that E is the largest at the edge of the shed facing the flow direction, reaching 0.79. The median volume diameter of water droplet (MVD) has a greater impact on the E than wind speed (v). The length, thickness and amount of rime icing on the insulator calculated by the model increases with time, whose errors with that obtained by the tests are less than 12.82%, 15.78% and 14.07%, respectively. Moreover, the simulated icing distribution is well consistent with the experimental results. Therefore, the effectiveness of the numerical simulation method was proved in the present research. © 2022, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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An ATP “Synthase” Derived from a Single Structural Domain of Bacterial Histidine Kinase

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Angewandte Chemie 2024年第13期136卷

作者： Shixia Ji Dr. Yuan Zhou Dr. Jiawen Chen Dr. Minghui Yang Dr. Conggang Li Dr. Maili Liu Dr. Yixiang Liu Dr. Ling Jiang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Magnetic Resonance in Biological System State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan 430074 China

ATP (adenosine triphosphate) is a vital energy source for living organisms, and its biosynthesis and precise concentration regulation often depend on macromolecular machinery composed of protein complexes or complicated multidomain proteins. We have identified a single-domain protein HK853 CA derived from bacterial histidine kinases (HK) that can catalyze ATP synthesis efficiently. Here, we explored the reaction mechanism and multiple factors that influence this catalysis through a combination of experimental techniques and molecular simulations. Moreover, we optimized its enzymatic activity and applied it as an ATP replenishment machinery to other ATP-dependent systems. Our results broaden the understanding of ATP biosynthesis and show that the single CA domain can be applied as a new biomolecular catalyst used for ATP supply.

关键词： ATP synthesis histidine kinase catalysis protein NMR spectroscopy

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Research progress in the regulation of secondary metabolism in medicinal plants by MYB transcription factors

Journal of Holistic Integrative Pharmacy

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Journal of Holistic Integrative Pharmacy 2023年第4期4卷 287-292页

作者： Xi Huang Quan Yang Hongyang Gao School of Chinese Materia Medica Guangdong Pharmaceutical University Guangzhou 510006 China Guangdong Provincial Research Center on Good Agricultural Practice & Comprehensive Agricultural Development Engineering Technology of Cantonese Medicinal Materials Guangzhou 510006 China Comprehensive Experimental Station of Guangzhou Chinese Material Medica China Agriculture Research System (CARS-21-16) Guangzhou 510006 China Key Laboratory of State Administration of Traditional Chinese Medicine for Production & Development of Cantonese Medicinal Materials Guangzhou 510006 China

MYB transcription factors (MYB TFs)are one of the largest families of transcription factors in plants, which are widely involved in various fields of plant growth and development, and play an important regulatory role in the biosynthesis of plant secondary metabolites. Most of the current studies on MYB transcription factors have focused on agricultural crops, and fewer studies have been conducted on medicinal plants. Therefore, this study reviews the research progress of plant MYB transcription factors in secondary metabolism of medicinal plants, which provides ideas and methods for better utilisation and development of medicinal plants.

关键词： MYB transcription factor Medicinal plants Secondary metabolism Research progress

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Compare of three micropattern methods for high-throughput cell arrangement 21

Compare of three micropattern methods for high-throughput ce...

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21st International Conference on Miniaturized systems for Chemistry and Life Sciences, MicroTAS 2017

作者： Hun, Tingting Liu, Yaoping Guo, Yechang Liu, Xiaoyi Wang, Wei Sun, Yan Fan, Yubo School of Biological Science and Medical Engineering Beihang University Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education Beijing100191 China Institute of Microelectronics Peking University Beijing100871 China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Beijing100871 China Innovation Center for Micro-Nano-electronics and Integrated System Beijing100871 China State Key Laboratory of Transducer Technology Chinese Academy of Sciences Shanghai200050 China

ISBN: (纸本)9780692941836

Investigations on single-cell level are significant in cellular researches, and the captured of single cell have been reported by many researchers. However, there is still a lack of effective methods to realize high-throughput cell capture and arrangement simultaneously. In this paper, we compared three micropattern methods for high-throughput cell capture and arrangement, and we found a micropore-arrayed membrane based micropattern method could reach efficiency higher than 90%. © 17CBMS-0001.

关键词： Cytology

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