检索结果-内蒙古大学图书馆

Hydrogel-elastomer-based stretchable strain sensor fabricated by a simple projection lithography method

International Journal of Smart and Nano Materials 2021年第3期12卷 256-268页

作者： Zhenqing Li Xiangnan He Jianxiang Cheng Honggeng Li Yuan-Fang Zhang Xiaojuan Shi Kai Yu Hui Ying Yang Qi Ge Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhenChina Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and TechnologyShenzhenChina Digital Manufacturing and Design Centre Singapore University of Technology and DesignSingapore Department of Mechanical Engineering University of Colorado DenverDenverCOUSA National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinP.R.China

Stretchable strain sensor detects a wide range of strain variation and is therefore a key component in various *** traditional ones made of elastomers doped with conductive components or fabricated with liquid conductors,ionically conductive hydrogel-based strain sensors remain conductive under large deformations and are ***,dehydration is a challenging issue for the *** have developed hydrogel-elastomer-based strain sensors where an elastomer matrix encapsulates a hydrogel circuit to prevent its ***,the reported multistep approaches are generally *** group recently reported a multimaterial 3D printing approach that enables fast fabrication of such sensors,yet requires a self-built digital-light-processing-based multimaterial 3D ***,we report a simple projection lithography method to fabricate hydrogel-elastomer-based stretchable strain sensors within 5 *** method only requires a UV projector/lamp with photomasks;the chemicals are commercially available;the protocols for preparing the polymer precursors are friendly to users without chemistry ***,the manufacturing flexibility allows users to readily pattern the sensor circuit and attach the sensor to a 3D printed soft pneumatic actuator to enable strain sensing on the *** proposed approach paves a simple and versatile way to fabricate hydrogel-elastomer-based stretchable strain sensors and flexible electronic devices.

关键词： Ionically conductive hydrogel stretchable strain sensor projection lithography

来源：评论

学校读者我要写书评

暂无评论

A Band Stop Decoupling Structure for Circularly Polarized Antennas With Different Intervals

A Band Stop Decoupling Structure for Circularly Polarized An...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Ding, Yuhang Deng, Shasha Chen, Weidong Zhang, Zhongxiang Chen, Chang University of Science and Technology of China School of Information Science and Technology Hefei230031 China Hefei Normal University Key Laboratory of Simulation and Design for Electronic Information System Hefei230601 China

ISBN: (纸本)9781665452366

In this paper, a novel band stop decoupling structure (BSDS) for circularly polarized microstrip antenna array with different intervals to realize mutual coupling reduction is proposed. The BSDS is composed of complementary split-rings resonator (CSRRs) and split-rings resonator (SRRs), where the CSRRs block TM waves by electric resonance and the SRRs block TE waves by magnetic resonance, respectively. The proposed design is verified by the simulation and the results indicate that the isolation enhancement more than 35 dB can be obtained at the center frequency of 3.4 GHz when the center spacing is 0.37 λ0. Futhermore, when the center spacing reduces to 0.26 λ0, the mutual coupling remains below 25 dB. Besides, the BSDS can improve the radiation pattern offset without affecting the gain and the backward radiation of antennas. © 2022 IEEE.

关键词： Magnetic resonance

来源：评论

学校读者我要写书评

暂无评论

Numerical Study on Scale Effect of Full-scale Submarine Sailing Near Free Surface in Stratified Fluid 34th

Numerical Study on Scale Effect of Full-scale Submarine Sail...

引用

34th International Ocean and Polar Engineering Conference, ISOPE 2024

作者： Cui, Hujia Kong, Yuan Wang, Xianzhou Yuan, Ye School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology China Key Laboratory of ship and ocean hydrodynamics of Hubei Province Hubei Wuhan China China Ship Development and Design Center Wuhan China

ISBN: (纸本)9781880653784

The density is not constant in the real environment of submarine navigation. So it’s necessary to study the hydrodynamic characteristics and wake of full-scale submarine in weakly stratified fluid. For the purpose of simulating the submarine sailing in the real sea condition, an unsteady RANS equation has been solved with realizable k − e model and a weak density stratification has been applied. Firstly, the grid convergence study has been conducted to verify the numerical method and appropriate grids were selected. And the density of the fluid was defined as a function of submerged depth. Then the resistance coefficients and free surface of full-scale submarine in uniform and stratified fluids have been compared to study the influence of density stratification. Finally, pressure distributions on submarine surface and free surface waves at full- and model-scale have been compared. The results demonstrate that the phenomenon of resistance increase also exists in weakly stratified environment. Moreover, the scale effect on pressure distribution and free surface can be observed at the positions where the submarine surface curvature changes drastically. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Computational fluid dynamics

来源：评论

学校读者我要写书评

暂无评论

Submarine induced magnetic field simulation method based on multi-magnet combination 4

Submarine induced magnetic field simulation method based on ...

引用

4th International Conference on Computers, Information Processing and Advanced Education, CIPAE 2023

作者： Huang, Dongye He, Jie Wang, Yu Wang, Zuoshuai Wuhan University of Science and Technology Wuhan China Wuhan Ship Communication Research Institute Laboratory of Low-Frequency Electro-Magnetic Communication Technology Wuhan China Wuhan Second Ship Design and Research Institute Hubei Key Laboratory of Marine Electromagnetic Detection and Control Wuhan China

ISBN: (纸本)9798350342710

The magnetic field signal induced by the submarine will be captured and located by the airborne magnetic probe. In order to improve the survival rate of submarine after being located, a decoy based on the combination of multiple magnets was designed. The decoy is composed of several solenoid coils, which are arranged linearly among different solenoid coils. The rotation Angle, equivalent current and distance between magnets of each solenoid coil are optimized by genetic algorithm. The simulation results show that the degree of fitting between the decoy and the vertical component of the magnetic field of the submarine at a height of 15m reaches 71.6%, and the total length of the control decoy is less than 7m, which has a certain engineering practical value. © 2023 IEEE.

关键词： Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

Status of UnDifferenced and Uncombined GNSS Data Processing Activities in China

引用

Journal of Geodesy and Geoinformation science 2023年第3期6卷 135-144页

作者： Pengyu HOU Delu CHE Teng LIU Jiuping ZHA Yunbin YUAN Baocheng ZHANG State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China (German)International Science and Technology Cooperative Offshore Center for Geodesy Frontier Technology Wuhan 430077China Guangzhou Urban Planning&Design Survey Research Institute Guangzhou 510060China

With the continued development of multiple Global Navigation Satellite Systems(GNSS)and the emergence of various frequencies,UnDifferenced and UnCombined(UDUC)data processing has become an increasingly attractive *** this contribution,we provide an overview of the current status of UDUC GNSS data processing activities in *** activities encompass the formulation of Precise Point Positioning(PPP)models and PPP-Real-Time Kinematic(PPP-RTK)models for processing single-station and multi-station GNSS data,*** single-station data processing,we discuss the advancements in PPP models,particularly the extension from a single system to multiple systems,and from dual frequencies to single and multiple ***,we introduce the modified PPP model,which accounts for the time variation of receiver code biases,a departure from the conventional PPP model that typically assumes these biases to be *** the realm of multi-station PPP-RTK data processing,we introduce the ionosphere-weighted PPP-RTK model,which enhances the model strength by considering the spatial correlation of ionospheric *** also review the phase-only PPP-RTK model,designed to mitigate the impact of unmodelled code-related ***,we explore GLONASS PPP-RTK,achieved through the application of the integer-estimable *** large-scale network data processing,we introduce the all-in-view PPP-RTK model,which alleviates the strict common-view requirement at all ***,we present the decentralized PPP-RTK data processing strategy,designed to improve computational ***,this work highlights the various advancements in UDUC GNSS data processing,providing insights into the state-of-the-art techniques employed in China to achieve precise GNSS applications.

关键词： Global Navigation Satellite Systems(GNSS) UnDifferenced and UnCombined(UDUC) Precise Point Positioning(PPP) PPP-Real-Time Kinematic(PPP-RTK) single-station data processing multi-station data processing

来源：评论

学校读者我要写书评

暂无评论

High-Precision Point Cloud Data Acquisition for Robot Based on Multiple Constraints 16th

High-Precision Point Cloud Data Acquisition for Robot Based ...

引用

16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Li, Bingbing Zhang, Teng Sun, Hao Deng, Runpeng Peng, Fangyu Yan, Rong Tang, Xiaowei The National NC System Engineering Research Center School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China The Wuhan Digital Design and Manufacturing Innovation Center Co. Ltd. Wuhan430074 China The State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819964796

The foundation of high-precision 3D reconstruction is the acquisition of high-precision point clouds. Through multi-view point cloud scanning and alignment, the point cloud of parts can be obtained. The great flexibility of the robot enables it to carry out scanning operations that require multi-view. However, the robots are limited in position error, and the accuracy of the camera varies depending on the range of vision. In addition, the point cloud density is influenced by the curvature of the workpiece, which seriously limits the accuracy of point cloud acquisition and registration. To solve these problems, a method of high-precision point cloud data acquisition for robots based on multiple constraints is proposed. The precision of the measuring system is increased by imposing constraints. So the high-performance field of vision of the camera and the high-performance motion space of the robot are obtained. The effect of workpiece curvature on point cloud scanning is thought to require increased camera viewpoints. After obtaining the camera viewpoints, the moving route planning of the robot is implemented using the ant colony voting method. In this paper, a curved blade experiment was carried out to prove the advantages of our method. It is not necessary for the point cloud overlap rate or the parts with many features. The accuracy of scanned point clouds is 0.249 mm, which is less than the results of using intelligent algorithms and marked points. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Cameras

来源：评论

学校读者我要写书评

暂无评论

Simulation Study of Filling Conditions for Aircraft Fire Suppression Systems

Simulation Study of Filling Conditions for Aircraft Fire Sup...

引用

2022 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2022

作者： Yuan, Changyu Wang, Yameng Li, Haofan Dai, Chaoqi Lu, Song Zhang, Heping State Key Laboratory of Fire Science University of Science and Technology of China Hefei China Shenyang Airplane Design & Res Inst Shenyang China

ISBN: (数字)9781839537769

ISBN: (纸本)9781839537769

Based on the two-phase flow theory and the Peng-Robinson equation, a mathematical model of an airplane fire extinguishing system is propoesed. The flow characteristics of the extinguishing system under different filling pressures and initial temperatures were studied. It is found that at 5.75 kg of agent charge, the filling pressure can influence the discharge rate of bottle, and this effect decreases with increasing pressure. The emptying time, storage rate and mass flow rate of the nozzle at 4, 5 and 6 MPa pressures are close to each other, and the fire extinguishing system with a filling pressure of 6 MPa releases all Halon 1301 into the target compartment when 1.035 s. The initial temperature had a small effect on the discharge efficiency of the system, with the temperature at which the airplane was cruising being the least favorable for agent discharge. The flow rate at each nozzle is strongly influenced by the initial temperature. The initial temperature affects the in-tube distribution of Halon 1301, where only about 12 % of Halon 1301 is emitted from nozzles 3 and 4, and this value may decrease to 3.6% as the initial temperature decreases. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Aircraft

来源：评论

学校读者我要写书评

暂无评论

Highly Stereoselective C-Glycosylation by Photocatalytic Decarboxylative Alkynylation on Anomeric Position:A Facile Access to Alkynyl C-Glycosides

引用

Chinese Journal of Chemistry 2022年第6期40卷 681-686页

作者： Kailin Lu Yingying Ma Shihui Liu Shixun Guo Yongqiang Zhang Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism Shanghai Key Laboratory of New Drug DesignSchool of PharmacyEast China University of Science and TechnologyShanghai 200237China College of Medicine Jiaxing UniversityJiaxingZhejiang 314001China

The highly stereoselective synthesis of diverse medicinally valuable alkynyl C-glycosides under mild and green reaction conditions remains a great ***,we wish to report a visible-light induced photocatalytic decarboxylative alkynylation *** utilizing an iridium photocatalyst in the presence of visible light,glycosyl radicals are in-situ generated via the decarboxylation of anomeric acids and efficiently coupled with a variety of ethynylbenziodoxolones(EBXs),which allows the facile synthesis of a variety of alkynyl C-glycosides in moderate to high yields and with excellent diastereoselectivity.

关键词： Photocatalysis Anomeric position Decarboxylative alkynylation C-C coupling Glycosides

来源：评论

学校读者我要写书评

暂无评论

Gradient-index curved acoustic lenses for high-precision imaging 4

Gradient-index curved acoustic lenses for high-precision ima...

引用

4th International Computational Imaging Conference, CITA 2024

作者： Zhang, Lei Li, Wei Liu, Zeru Zhang, Min Lian, Meng Cao, Tun School of Optoelectronic Engineering and Instrument Science Dalian University of Technology Dalian116024 China National Key Laboratory of Electromagnetic Information Control and Effects Shenyang110036 China Shenyang Aircraft Design and Research Institute Shenyang110036 China

ISBN: (纸本)9781510688834

Acoustic lens is widely used in ultrasound imaging to manipulate the focusing of sound beams. In this paper, a three-dimensional gradient-index multifunctional lens based on circuit control is proposed. Different from the previous acoustic lens based on phonon crystal or crimp-space design, the lens is easy to manufacture and only depends on the refractive index tunable material to fill the lens structure. Based on multiple variable refractive index of this article Einstein ring RineHart curved shell structure, building material and refractive index of the mapping relation of shell structure, electrically induced regulation method of refractive index is put forward, make the surface acoustic wave propagation in a three-dimensional curved surface lens effect and its propagation in 2 d plane lens effect, instead of being placed in the surface concave and convex lens interference of objects. Several strange acoustic phenomena, such as invisibility cloak, Luneburg lens and Fisheye Lens, have been realized by simulation. By adjusting the gradient distribution of refractive index of the lens electrically, acoustic devices with different functional waveforms can be switched. The research results provide theoretical guidance for the design of a new type of multifunctional lens. © 2025 SPIE.

关键词： Ultrasonic imaging

来源：评论

学校读者我要写书评

暂无评论

Unveiling the geometric site dependent activity of spinel Co_(3)O_(4)for electrocatalytic chlorine evolution reaction

引用

Journal of Energy Chemistry 2024年第5期92卷 95-103页

作者： Linke Cai Yao Liu Jingfang Zhang Qiqi Jia Jiacheng Guan Hongwei Sun Yu Yu Yi Huang Key Laboratory of Pesticide&Chemical Biology of Ministry of Education Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction of Ministry of EducationCollege of ChemistryCentral China Normal UniversityWuhan 430079HubeiChina Key Laboratory of Green Chemical Engineering Process of Ministry of Education Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationHubei Key Laboratory of Novel Reactor and Green Chemical TechnologySchool of Chemical Engineering&PharmacyWuhan Institute of TechnologyWuhan 430205HubeiChina College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108FujianChina School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601AnhuiChina

Spinel cobalt oxide(Co_(3)O_(4)),consisting of tetrahedral Co^(2+)(CoTd)and octahedral Co^(3+)(CoOh),is considered as promising earth-abundant electrocatalyst for chlorine evolution reaction(CER).Identifying the catalytic contribution of geometric Co site in the electrocatalytic CER plays a pivotal role to precisely modulate electronic configuration of active Co sites to boost ***,combining density functional theory calculations and experiment results assisted with operando analysis,we found that the Co_(Oh) site acts as the main active site for CER in spinel Co_(3)O_(4),which shows better Cl^(-)adsorption and more moderate intermediate adsorption toward CER than CoTd site,and does not undergo redox transition under CER condition at applied *** by above findings,the oxygen vacancies were further introduced into the Co_(3)O_(4) to precisely manipulate the electronic configuration of Co_(Oh) to boost Cl^(-)adsorption and optimize the reaction path of CER and thus to enhance the intrinsic CER activity *** work figures out the importance of geometric configuration dependent CER activity,shedding light on the rational design of advanced electrocatalysts from geometric configuration optimization at the atomic level.

关键词： Chlorine evolution reaction Geometry effects Active chlorine Electronic configuration optimization Spinel oxides

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：