检索结果-内蒙古大学图书馆

Ultrahigh Performance Triboelectric Nanogenerator Enabled by Charge Transmission in Interfacial Lubrication and Potential Decentralization Design

引用

Research 2022年第4期2022卷 519-529页

作者： Wencong He Wenlin Liu Shaoke Fu Huiyuan Wu Chuncai Shan Zhao Wang Yi Xi Xue Wang Hengyu Guo Hong Liu Chenguo Hu School of Physics State Key Laboratory of Power Transmission Equipment and System Security and New TechnologyChongqing UniversityChongqing 400044China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

Triboelectric nanogenerator (TENG) is a promising strategy for harvesting low frequency mechanical energy. However, the bottlenecks of limited electric output by air/dielectric breakdown and poor durability by material abrasion seriously restrict its further improvement. Herein, we propose a liquid lubrication promoted sliding mode TENG to address both issues. Liquid lubrication greatly reduces interface material abrasion, and its high breakdown strength and charge transmission effect further enhance device charge density. Besides, the potential decentralization design by the voltage balance bar effectively suppresses the dielectric breakdown. In this way, the average power density up to 87.26 W·m^(-2)·Hz^(-1), energy conversion efficiency of 48%, and retention output of 90% after 500,000 operation cycles are achieved, which is the highest average power density and durability currently. Finally, a cell phone is charged to turn on by a palm-sized TENG device at 2 Hz within 25 s. This work has a significance for the commercialization of TENG-based self-powered systems.

关键词： durability dielectric generator

来源：评论

学校读者我要写书评

暂无评论

Formal management-specifying approach for model-based safety assessment

引用

Journal of systems Engineering and Electronics 2023年第6期34卷 1589-1601页

作者： XU Changyi DUAN Yiman ZHANG Chao School of Control Science and Engineering Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of EducationDalian University of TechnologyDalian 116024China State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China

In the field of model-based system assessment,mathematical models are used to interpret the system ***,the industrial systems in this intelligent era will be more *** management operations will be dynamically set,and the system will be no longer static as it is initially ***,the static model generated by the traditional model-based safety assessment(MBSA)approach cannot be used to accurately assess the *** mainly exists three ***:huge and complex behaviors make the modeling to be trivial manual;Dynamic:though there are thousands of states and transitions,the previous model must be resubmitted to assess whenever new management arrives;Unreusable:as for different systems,the model must be resubmitted by reconsidering both the management and the system itself at the same time though the management is the *** by solving the above problems,this research studies a formal management specifying approach with the advantages of agility modeling,dynamic modeling,and specification design that can be ***,three typical managements are specified in a series-parallel system as a demonstration to show the potential.

关键词： model-based safety assessment(MBSA) management availability reliability maintainability continuous time Markov chain.

来源：评论

学校读者我要写书评

暂无评论

A biomimetic aluminum composite exhibiting gradient-distributed thermal expansion,high thermal conductivity,and highly directional toughness

引用

材料科学技术（英文版） 2025年第10期213卷 90-97页

作者： B.Ke Dong C.Long Wei J.Chao Lin L.Lu Xie K.Ke Liu T.Jiao Xiong W.Hai Song Peng Tong Y.Ping Sun Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei230031China University of Science and Technology of China Hefei230026China School of Electronic Engineering and Intelligent Manufacturing Anqing Normal UniversityAnqing246133China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei230031China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei230031China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei230031China

Because of the large coefficient of thermal expansion(CTE)(23 ppm K-1),aluminum faces challenges in meeting the demands of high dimensional stability in precision instruments,microelectronics,and *** negative thermal expansion(NTE)particles into aluminum can create composites with either zero or low ***,the resulting composites usually have poor thermal conductivity due to their monolithic configuration,i.e.,the NTE particles are filled ***,heat sinks should be equipped to assist their usage(e.g.,in thermal management).This in turn causes strong thermal stress in the packaging system owing to the high contrast in the CTEs between those monolithic composites and heat sinks typically made of copper or ***,we propose a gradient configuration for low-CTE aluminum composite,inspired by the bamboo *** gradient distribution of NTE particles(Zn0.5Sn0.3Mn0.2NMn3,ZSM)was obtained by laying up several layers of ZSM/Al with the ZSM fraction ranging from 0 to 28 vol.％.In the gradient composite,the CTE near room temperature varies from 3.4 pm K-1 on one side to 21 ppm K-1 on the other *** a gradient CTE distribution would facilitate the low-thermal-stress designs and thus help stabilize the dimension of a precision ***,this composite has a high thermal conductivity of 130 W m-1 K-1 and strong toughness when the flexural loading is applied on the 28 vol.％ZSM/Al *** research provides a novel approach to designing metallic matrix composites with unprecedented performance.

关键词： Biomimetic materials Gradient materials Low thermal expansion High thermal conductivity Toughness

来源：评论

学校读者我要写书评

暂无评论

EUV Lithography imaging modeling and calculation based on full-vector beam propagation method 8

EUV Lithography imaging modeling and calculation based on fu...

引用

8th International Workshop on Advanced Patterning Solutions, IWAPS 2024

作者： Zhong, Zhilong Liu, Jiamin He, Pinxuan Jiang, Hao Gu, Honggang Liu, Shiyuan State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan430074 China Optics Valley Laboratory Wuhan430074 China

ISBN: (数字)9781510686335

ISBN: (纸本)9781510686328

Accurately and efficiently calculating the near field of the EUV mask with large-scale and complex patterns is a critical part of EUV aerial image simulation. Therefore, a calculation method based on the full-vector beam propagation method is proposed, which successfully realizes ultra-fast near-filed calculation with comparable accuracy for the investigated examples. The proposed method shows strong competitiveness for EUV mask near-field calculation and can also be applied to calculate the EUV aerial image accurately and efficiently by supplementing the projection lens model and vector imaging method. © 2024 SPIE.

关键词： Beam propagation method

来源：评论

学校读者我要写书评

暂无评论

In situ X-ray imaging and numerical modeling of damage accumulation in C/SiC composites at temperatures up to 1200℃

引用

Journal of Materials Science & technology 2024年第30期197卷 65-77页

作者： Weijian Qian Wanen Zhang Shengchuan Wu Yue Hu Xiangyu Zhang Qiaodan Hu Shaoming Dong Shantung Tu State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengdu 610031China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Pressure Systems and Safety Ministry of EducationEast China University of Science and TechnologyShanghai 200237China

Carbon fiber reinforced silicon carbide matrix composites(C/SiC)have emerged as key materials for ther-mal protection systems owing to their high strength-to-weight ratio,high-temperature durability,resis-tance to oxidation,and outstanding ***,manufacturing defects deteriorate the mechani-cal response of these composites under extreme thermal-force coupling conditions,prompting significant research *** study demonstrates a customized in situ loading device compatible with syn-chrotron radiation facilities,enabling high spatial and temporal resolution recording of internal material damage evolution and failure behavior under thermal-force coupling *** thermal radia-tion units in a confocal configuration were used to create ultra-high-temperature environments,offering advantages of compactness,rapid heating,and *** situ tensile tests were conducted on C/SiC samples in a nitrogen atmosphere at both room temperature and 1200℃.The high-resolution image data demonstrate various failure phenomena,such as matrix cracking and pore ***-based fi-nite element simulations indicate that the temperature-dependent variation of the failure mechanism is attributable to thermal residual stresses and defect-induced stress *** work seamlessly integrates extreme mechanical testing methods with in situ observation techniques,providing a compre-hensive solution for accurately quantifying crack initiation,pore connection,and failure behavior of C/SiC composites.

关键词： Ceramic matrix composites Extreme environments X-ray computed tomography Internal damage evolution Image-based finite element method

来源：评论

学校读者我要写书评

暂无评论

Influence of different anodised nanoporous structures on the anti-icing and electrical properties of transmission Al lines

引用

High Voltage 2025年第1期10卷 167-177页

作者： Xu Dai Yuan Yuan Jie Xiao Chenghao Jiang Xujiang Hua Huiying Xiang Tao Zhu Guoyong Liu Jiang Zhou Ruijin Liao State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina College of Materials Science and Engineering Chongqing UniversityChongqingChina Dongfang Electric Machinery Co. LtdDeyangChina

Ice accumulation of overhead transmission lines can lead to serious damage to power *** nanostructured Al conductors are proposed to replace the de-icing or ice-melting equipment for economic advantages,good anti-icing properties and robust electrical *** under different direct current densities is adopted to fabricate two nanostructures on Al conductors,including the reticular and honeycomb-like nanoporous *** to pure Al conductors,the anodised surface of honeycomb-like nanoporous structures exhibits lower ice adhesion(3.82 kPa)and ice *** conductor steel reinforced treated in the proposed method has also been validated to exhibit a significant anti-glaze icing ***-tionally,corona performance and line loss are experimentally measured and calculated to prove good electrical *** 0.27 A Al strand shows the highest corona inception voltage(27.86 kV)and the lowest AC resistance(4.65Ω/km),which is attributed to the good dielectric property and heat ***,the proposed anti-icing transmission conductors show profound application potential for power systems.

关键词： electrical structures properties

来源：评论

学校读者我要写书评

暂无评论

Analysis of the Causes of Stripe Black Spot Defects in Hot-Dip Galvanized Strip of Thin Slab Continuous Casting and Rolling Production Line 6

Analysis of the Causes of Stripe Black Spot Defects in Hot-D...

引用

2024 6th International Conference on Advanced Materials and Ecological Environment, AMEE 2024

作者： Wang, Jiangong State Key Laboratory of Metallurgical Intelligent Manufacturing System Automation Research and Design Institute of Metallurgical Industry Co. Ltd. Beijing100071 China

After the thin slab continuous casting and rolling production line of a domestic steel plant was put into operation, with the vigorous development of hot-dip galvanized products, the strip blackening defect on the surface became more prominent. After hot-dip galvanizing, the coil had a certain spacing of strip black spot defects on the surface, which could not meet the needs of high-end users and restricted the improvement of the manufacturing capacity of the headless production ***, this article uses scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), three-dimensional profilometer, and optical microscope (OM) to study the microscopic characteristics and causes of black spot defects on the surface of hot-dip galvanized steel. There are a large number of oxidized black spots on the surface of the stripe black area. The zinc layer thickness of the cross-section at the blackened area is smaller than that of the normal area, and the secondary dendrites inside the zinc layer at the blackened area are not well-developed in the normal area. The surface roughness Ra and Rt of the blackened position in the three-dimensional morphology display show significant differences from the normal position. Electron microscopy observation shows that the grain size of the substrate at the blackened area is different from that at the normal area after removing the zinc layer, which is the direct cause of the final surface showing stripe black spot defects. By optimizing the heating temperature uniformity of the IH on the thin slab continuous casting and rolling production line, the stripe black spot defects were ultimately eliminated. © Published under licence by IOP Publishing Ltd.

关键词： Continuous casting

来源：评论

学校读者我要写书评

暂无评论

Development of a cable-driven redundant space manipulator with large bending angle by combining quaternion joints and segmented coupled linkages mechanism

引用

Chinese Journal of Aeronautics 2023年第11期36卷 483-499页

作者： Taiwei YANG Jian HUANG Wenfu XU Ke SHAO Bin LIANG School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China Department of Automation Tsinghua UniversityBeijing 100854China

A cable-driven redundant manipulator has significant potential in confined space applications, such as environmental exploration, equipment monitoring, or maintenance. A traditional design requires 3N driving motors/cables to supply 2N degrees of freedom(DOF) movement *** number of motors is 1.5 times that of the joints’ DOF, increasing the hardware cost and the complexity of the kinematics, dynamics, and control. This study develops a novel redundant space manipulator with decoupled cable-driven joints and segmented linkages. It is a 1680 mm continuum manipulator with eight DOF, consisting of four segmented linkages driven by eight motors/pairs of cables. Each segment has two equivalent DOF, which are realized by four quaternion joints synchronously driven by two linkage cables. The linkage cables of adjacent joints are symmetrically decoupled and offset at 180°. This design allows equal-angle movement of all the joints of each segment. Moreover, each decoupling driving mechanism is designed based on a pulley block composed of two fixed and movable pulleys. The two movable pulleys realize the opposite but equidistant motions of the two driving cables, i.e., pulling and loosening, assuring symmetrical movements of the two driving cables of each segment. Consequently, the equivalent 2N-DOF joints are driven only by 2N motors, significantly reducing the hardware cost and simplifying the mapping relationship between the motor angle/cable length and the joint angle. Furthermore, the bending range of each segment could reach 360°, which is three times that of a traditional design. Finally, a prototype has been developed and experimented with to verify the performance of the proposed mechanism and the corresponding algorithms.

关键词： Cable-driven Mechanism design Redundant manipulators Segmented linkages Kinematics

来源：评论

学校读者我要写书评

暂无评论

A New Active Negative Stiffness Control Strategy for Improving Low-Frequency Vibration Isolation Performance 3

A New Active Negative Stiffness Control Strategy for Improvi...

引用

3rd International Conference on Electrical Engineering and Control Science, IC2ECS 2023

作者： Zhang, Zhengguang Yuan, Zhongxiang Li, Xiaoqing Huazhong University of Science and Technology State Key Laboratory of Intelligent Manufacturing Equipment and Technology Wuhan China

ISBN: (纸本)9798350382426

In this study, a new active negative stiffness (ANS) control strategy is proposed to improve the low-frequency vibration isolation performance of a vibration isolation system. The proposed strategy combines ANS with sky-hook (SH) control. ANS is used to effectively reduce the stiffness of the system, thus lowering the natural frequency. SH control is used to improve the stability margin of the ANS loop. The proposed strategy is validated experimentally. The results show that the ANS+SH strategy can effectively reduce the vibration transmissibility at low frequency. Compared to using SH alone, the vibration transmissibility at the natural frequency is reduced from -1.4SdB to -10.83dB, with a significant improvement in low-frequency vibration control performance. The proposed strategy is a promising approach for improving the low-frequency vibration isolation performance of vibration isolation systems. © 2023 IEEE.

关键词： Active negative stiffness Sky-hook damping Vibration isolation

来源：评论

学校读者我要写书评

暂无评论

25%-Efficiency flexible perovskite solar cells via controllable growth of SnO_(2)

引用

iEnergy 2024年第1期3卷 39-45页

作者： Ningyu Ren Liguo Tan Minghao Li Junjie Zhou Yiran Ye Boxin Jiao Liming Ding Chenyi Yi State Key Laboratory of Power System Operation and Control Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

High power conversion efficiency(PCE)flexible perovskite solar cells(FPSCs)are highly desired power sources for aerospace crafts and flexible ***,their PCEs still lag far behind their rigid ***,we report a high PCE FPSC by controllable growth of a SnO_(2)electron transport layer through constant pH chemical bath deposition(CBD).The application of SnSO_(4)as tin source enables us to perform CBD without strong acid,which in turn makes it applicable to acid-sensitive flexible indium tin ***,a mild and controllable growth environment leads to uniform particle growth and dense SnO_(2)deposition with full coverage and reproducibility,resulting in a record PCE of up to 25.09%(certified 24.90%)for FPSCs to *** as-fabricated FPSCs exhibited high durability,maintaining over 90% of their initial PCE after 10000 bending cycles.

关键词： Flexible perovskite solar cells chemical bath deposition SnO_(2) electron transport layer

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：