检索结果-内蒙古大学图书馆

A study of pulsed high voltage driven hollow-cathode electron beam sources through synchronous optical trigger

Plasma Science and technology 2024年第5期26卷 82-90页

作者：霍卫杰贺伟国韩罗峰朱康武王锋 Shanghai Aerospace Electronic Technology Institute Shanghai 201109People’s Republic of China School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444People’s Republic of China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024People’s Republic of China Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Taiji Laboratory for Gravitational Wave UniverseHangzhou 310024People’s Republic of China Shanghai Aerospace Control Technology Institute Shanghai 201109People’s Republic of China

In this study,a pulsed,high voltage driven hollow-cathode electron beam sources through an optical trigger is designed with characteristics of simple structure,low cost,and easy *** validate the new design,the characteristics of hollow-cathode discharge and electron beam characterization under pulsed high voltage drive are studied experimentally and discussed by discharge characteristics and analyses of waveform details,*** validation experiments indicate that the pulsed high voltage supply significantly improves the frequency and stability of the discharge,which provides a new solution for the realization of a high-frequency,high-energy electron beam *** peak current amplitude in the high-energy electron beam increases from 6.2 A to 79.6 A,which indicates the pulsed power mode significantly improves the electron beam ***,increasing the capacitance significantly affects the highcurrent,lower-energy electron beam more than the high-energy electron beam.

关键词： hollow-cathode nanosecond pulsed electron beam sources optical trigger pulsed high voltage supply beam current distribution

来源：评论

学校读者我要写书评

暂无评论

A Double Node Thin-Film Thermocouples for In-Situ measurement

A Double Node Thin-Film Thermocouples for In-Situ Measuremen...

引用

2022 International Conference on Automation, Robotics and Computer Engineering, ICARCE 2022

作者： Ma, Rong Zhang, Meiju Zhang, Zhongkai Huang, Manguo Liang, Xiaobo Liu, Jiangjiang Liu, Zhaojun Tian, Bian Xi'An Jiaotong University State Key Laboratory for Mechanical Manufacturing Systems Engineering Xi'an China Aviation Key Laboratory of Science and Technology on Special Condition Monitoring Sensor Technology Beijing Changcheng Aeronautic Measurement and Control Technology Research Institute Beijing China

ISBN: (纸本)9781665475488

The design, fabrication, testing and implementation of a new high-performance tungsten-rhenium thin film thermocouple are introduced. In this paper, tungsten-rhenium TFTCs are taken as the research object, after simulation analysis in COMSOL software and design, it is made by screen-printing technology and magnetron sputtering. This kind of thin film thermocouple primarily utilizes two kinds of electrode materials with varying composition combination, mainly tungsten with 5% rhenium and tungsten with 26% rhenium. Furthermore, high-temperature annealing is performed to maintain the mechanical properties and thus improve thermoelectric performance. The results demonstrate that the performance is reliable in the temperature range of 150-600 C° with a repeatability of 2.02%, providing application value for high-temperature in-situ sensing. © 2022 IEEE.

关键词： Thermocouples

来源：评论

学校读者我要写书评

暂无评论

A Non-canonical Excitatory PV RGC–PV SC Visual Pathway for Mediating the Looming-evoked Innate Defensive Response

引用

Neuroscience Bulletin 2024年第3期40卷 310-324页

作者： Man Yuan Sen Jin Gao Tan Siyuan Song Yizong Liu Huadong Wang Yin Shen Eye Center Renmin Hospital of Wuhan UniversityWuhan UniversityWuhan430060China The Brain Cognition and Brain Disease Institute Shenzhen Key Laboratory of Viral Vectors for BiomedicineShenzhen Institute of Advanced TechnologyChinese Academy of Sciences(CAS)Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsNational Medical Products Administration Key Laboratory for Research and Evaluation of Viral Vector Technology in Cell and Gene Therapy Medicinal ProductsShenzhen Key Laboratory of Quality Control Technology for Virus-Based TherapeuticsGuangdong Provincial Medical Products AdministrationShenzhen518055China Jan and Dan Duncan Neurological Research Institute Baylor College of MedicineHouston77030USA State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Key Laboratory of Magnetic Resonance in Biological SystemsWuhan Center for Magnetic ResonanceInnovation Academy for Precision Measurement Science and TechnologyCASWuhan430071China Frontier Science Center of Immunology and Metabolism Medical Research InstituteWuhan UniversityWuhan430071China

Parvalbumin-positive retinal ganglion cells(PV+RGCs)are an essential subset of RGCs found in various ***,their role in transmitting visual information remains ***,we characterized PV+RGCs in the retina and explored the functions of the PV+RGC-mediated visual *** applying multiple viral tracing strategies,we investigated the downstream of PV+RGCs across the whole ***,we found that the PV+RGCs provided direct monosynaptic input to PV+excitatory neurons in the superficial layers of the superior colliculus(SC).Ablation or suppression of SC-projecting PV+RGCs abolished or severely impaired the flight response to looming visual stimuli in mice without affecting visual ***,using transcriptome expression profiling of individual cells and immunofluorescence colocalization for RGCs,we found that PV+RGCs are predominant glutamatergic ***,our findings indicate the critical role of PV+RGCs in an innate defensive response and suggest a non-canonical subcortical visual pathway from excitatory PV+RGCs to PV+SC neurons that regulates looming visual *** results provide a potential target for intervening and treating diseases related to this circuit,such as schizophrenia and autism.

关键词： Parvalbumin-positive retinal ganglion cell Innate fear Superior colliculus Excitatory-excitatory neuronal connection Looming-evoked defensive response Subcortical pathway

来源：评论

学校读者我要写书评

暂无评论

Research on Dust Removal Efficiency for Photovoltaic Panel Cleaning Robot Based on DDPM 5

Research on Dust Removal Efficiency for Photovoltaic Panel C...

引用

5th International Symposium on Robotics and Intelligent manufacturing technology, ISRIMT 2023

作者： Zong, Yuqian Zhao, Gang He, Kai Zhang, Feifei Chen, Junwen Key Laboratory of Metallurgical Equipment and Control Technology Wuhan University of Science and Technology Ministry of Education Wuhan430081 China Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen Key Laboratory of Precision Engineering Shenzhen518055 China Key Laboratory of Automotive Power Train and Electronics Hubei University of Automotive Technology Hubei Shiyan442002 China

ISBN: (纸本)9798350316087

To address the challenge of cleaning rooftop photovoltaic panels with water, an innovative waterless dust removal cleaning robot has been designed. This study simulates the movement trajectory of gas-solid two-phase flow containing dust particles within a sealed enclosure based on Dense Discrete Phase Model (DDPM) of Fluent. The L16 Taguchi experimental method is adopted to analyze the dust removal characteristics under different conditions, including exit directions of the sealed enclosure, brush rotational speed and brush rotational direction. The particle velocity and the particle quantity are obtained to analyze the dust removal efficiency. The research shows that the impact of each processing parameter is ranked as follows: brush rotational speed, exit direction and brush rotational direction. The optimal dust removal efficiency is above 85% when the outlet is at the rear of the sealed enclosure, and the brush rotates clockwise at a speed of 5r/s. © 2023 IEEE.

关键词： Enclosures

来源：评论

学校读者我要写书评

暂无评论

Design and Analysis of a Multi-Legged Robot with Pitch Adjustive Units

引用

Chinese Journal of Mechanical Engineering 2021年第3期34卷 226-242页

作者： Qiang Ruan Jianxu Wu Yan-an Yao Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control TechnologyMinistry of EducationBeijing Jiaotong UniversityBeijing 100044China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

The paper proposes a novel multi-legged robot with pitch adjustive units aiming at obstacle *** only 6 degrees of freedom,the robot with 16 mechanical legs walks steadily and surmounts the obstacles on the complex *** leg unit with adjustive pitch provides a large workspace and empowers the legs to climb up obstacles in large sizes,which enhances the obstacle surmounting *** pitch adjustment in leg unit requires as few independent adjusting actuators as *** on the kinematic analysis of the mechanical leg,the biped and quadruped leg units with adjustive pitch are analyzed and *** configuration of the robot is designed to obtain a compact structure and pragmatic *** uncertainty of the obstacle size and position in the surmounting process is taken into consideration and the parameters of the adjustments and the feasible strategies for obstacle surmounting are *** the 3D virtual model and the robot prototype are built and the multi-body dynamic simulations and prototype experiments are carried *** results from the simulations and the experiments show that the robot possesses good obstacle surmounting capabilities.

关键词： Mechanical leg Multi-legged robot Obstacle surmounting Adjustive pitch Leg unit

来源：评论

学校读者我要写书评

暂无评论

Investigation by finite element modeling of hydrogen-assisted failure mechanisms in pipelines containing a crack-in-dent defect

引用

International Journal of Hydrogen Energy 2025年 143卷 769-779页

作者： Qin, Guojin Zhang, Chao Wang, Bohong Wang, Yihuan Cheng, Y. Frank School of Civil Engineering and Geomatics Southwest Petroleum University Sichuan Chengdu610500 China National & Local Joint Engineering Research Center of Harbour Oil & Gas Storage and Transportation Technology/Zhejiang Key Laboratory of Pollution Control for Port-Petrochemical Industry Zhejiang Ocean University Zhejiang Zhoushan316022 China Key Laboratory of Advanced Materials Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Zhejiang Ningbo315201 China Department of Mechanical & Manufacturing Engineering University of Calgary CalgaryABT2N 1N4 Canada

The present study developed an extended finite element method-based model to perform defect assessments for pipelines containing a crack-in-dent defect considering hydrogen-induced degradation (HID). The fracture toughness of X80 pipeline steel under mixed nitrogen/gaseous hydrogen environments with varying hydrogen blending ratios was used to simulate different degrees of HID. The effects of parameters on failure pressure were analyzed. Results indicate that the cracks combined with dents significantly weaken local burst capacity, with the weakest point near the dent edge. Increasing dent depth and crack geometries reduces failure pressure, with a critical threshold at 8 % of pipeline diameter. A high-pressure hydrogen environment further increases the failure risk of the pipeline. At a crack length of 80 mm, the failure pressure decreases from 16.89 MPa under hydrogen-free to 13.98 MPa at a hydrogen blending ratio of 15 vol%, demonstrating a 17.23 % reduction. Sensitivity analysis identifies crack depth as the most critical factor. © 2025 Hydrogen Energy Publications LLC

关键词： Sensitivity analysis

来源：评论

学校读者我要写书评

暂无评论

Gesture Recognition of sEMG Based on Res-LSTM 17th

Gesture Recognition of sEMG Based on Res-LSTM

引用

17th International Conference on Intelligent Robotics and Applications, ICIRA 2024

作者： Zhao, Yujia Zou, Chunlong Yun, Juntong Jiang, Du Huang, Li Liu, Ying Jiang, Guozhang Xie, Yuanmin Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education Wuhan University of Science and Technology Wuhan430081 China College of Mechanical Engineering Hubei University of Automotive Technology Shiyan442000 China Research Center for Biomimetic Robot and Intelligent Measurement and Control Wuhan University of Science and Technology Wuhan430081 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Hubei Province Key Laboratory of Intelligent Information Processing and Real-Time Industrial System Wuhan University of Science and Technology Wuhan430081 China College of Computer Science and Technology Wuhan University of Science and Technology Wuhan430081 China School of Mechanical Engineering Hubei Engineering University Xiaogan432000 China

ISBN: (纸本)9789819607761

sEMG (surface electromyography) signal control of bionic prostheses has been widely studied over the past few years. In particular, sparse sEMG signals are rapidly developing in the field of gesture recognition for their convenience, noninvasiveness, and ease of access. However, compared with high-density EMG signals, sparse EMG signals lack rich feature information, which in turn affects gesture recognition accuracy. In order to reduce the loss of feature information of sparse EMG signals in the spatio-temporal dimension, this paper proposes a hybrid neural network Res-LSTM combining residual network and long short-term memory network. The ordinary convolutional blocks in the CNN network are replaced with residual blocks, and the final fully connected layer is removed and a constant mapping layer is added to adequate extraction of spatial feature information of the data. The Res layer’s output is utilized as the input for the long and short-term memory (LSTM) network, which further extracts the features of the data in the temporal dimension, and finally completes the categorization output through a fully connected layer. The average accuracy of 91.11% for gesture-motion classification was verified by training on a homebrew dataset;and tested on a public dataset, NinaPro DB1, with an average accuracy of 91.03%. The experimental findings indicate that the proposed Res-LSTM network framework contributes to solving the problem of lack of feature information of sparse sEMG signals and improves the pattern recognition accuracy. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Gesture recognition

来源：评论

学校读者我要写书评

暂无评论

Fabrication and characterisation of La0.8Sr0.2CrO3-ITO thermocouples for high-temperature sensing

引用

International Journal of Nanomanufacturing 2022年第1期18卷 1-8页

作者： Chen, Bohan Huang, Manguo Zhang, Meiju Liang, Xiaobo Liu, Dan Wang, Lingyan Niu, Gang Zhang, Zhongkai Tian, Bian Shi, Peng Ren, Wei Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric Research School of Electronic and Information Engineering Xi’an Jiaotong University Xi’an710049 China Beijing Changcheng Aeronautic Measurement and Control Technology Research Institute Beijing101111 China Aviation Key Laboratory of Science and Technology on Special Condition Monitoring Sensor Technology Beijing101111 China State Key Laboratory for Mechanical Manufacturing Systems Engineering School of Mechanical Engineering Xi’an Jiaotong University Xi’an710049 China

La0.8Sr0.2CrO3-ITO thermocouples were successfully fabricated by screen printing. The La0.8Sr0.2CrO3 powder used for screen printing was obtained by the sol-gel method. The highest thermal voltage output was maintained at 270 mV at 1270°C. The microstructure of La0.8Sr0.2CrO3 and ITO electrode films were analysed by SEM. Thermoelectric response test was implemented to measure the performance of La0.8Sr0.2CrO3-ITO thermocouple by three times of thermal cycles. The results indicated that La0.8Sr0.2CrO3-ITO thermocouple showed good stability at high temperature. Copyright © 2022 Inderscience Enterprises Ltd.

关键词： Screen printing

来源：评论

学校读者我要写书评

暂无评论

Dual comb ranging: methodologies, systems and applications

Dual comb ranging: methodologies, systems and applications

引用

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Wu, Guanhao Zhou, Siyu Yang, Yuetang Ni, Kai State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China Division of Advanced Manufacturing Tsinghua Shenzhen International Graduate School Tsinghua University The University Town Tsinghua Campus Shenzhen518055 China

Dual-comb ranging is a powerful tool for absolute distance measurement. Here, we introduce dual-comb ranging's principle, noise suppression technologies, and applications in measuring space camera deformation and ...

ISBN: (纸本)9781957171258

关键词：

来源：评论

学校读者我要写书评

暂无评论

Microwave heating as a universal method to transform confined molecules into armchair graphene nanoribbons

引用

Nano Research 2023年第7期16卷 10644-10651页

作者： Haoyuan Zhang Yingzhi Chen Kunpeng Tang Ziheng Lin Xuan Li Hongwei Zhang Yifan Zhang Chi Ho Wong Chi Wah Leung Chee Leung Mak Yuan Hu Weili Cui Kecheng Cao Lei Shi State Key Laboratory of Optoelectronic Materials and Technologies Nanotechnology Research CenterGuangdong Province Key Lab of Display Material and TechnologySchool of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China Huzhou Key Laboratory of Environmental Functional Materials and Pollution Control School of EngineeringHuzhou UniversityHuzhou 313000China Department of Industrial and Systems Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 999077China Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong 999077China Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China

Armchair graphene nanoribbons(AGNRs)with sub-nanometer width are potential materials for the fabrication of novel nanodevices thanks to their moderate direct band *** are usually synthesized by polymerizing precursor molecules on substrate ***,it is time-consuming and not suitable for large-scale *** can also be grown by transforming precursor molecules inside single-walled carbon nanotubes(SWCNTs)via furnace annealing,but the obtained AGNRs are normally *** this work,microwave heating is applied for transforming precursor molecules into *** fast heating process allows synthesizing the AGNRs in *** different molecules were successfully transformed into AGNRs,suggesting that it is a universal *** importantly,as demonstrated by Raman spectroscopy,aberrationcorrected high-resolution transmission electron microscopy and theoretical calculations,less twisted AGNRs are synthesized by the microwave heating than the furnace *** results reveal a route for rapid production of AGNRs in large scale,which would benefit future applications in novel AGNRs-based semiconductor devices.

关键词： armchair graphene nanoribbons(AGNRs) microwave heating single-walled carbon nanotubes(SWCNTs) Raman spectroscopy

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：