检索结果-南通市图书馆

Effect of environment humidity to radon measurement with SSNTD

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2009年第4期20卷 228-230页

作者： HUO Yonggang XU Peng zhou chunlin YANG Feng Xi＇an Research Institute of Hi-Tech Xi ＇an 710025 China

For a passive radon detector of Solid State Nuclear Track Detector(SSNTD),the measurement results can be affected under an environment of high *** order to correct this kind of measurement errors,experiments in normal radon laboratory were *** track films were etched in 6.25 mol/L NaOH solution at 70°C for 12 h,and rinsed with water for 6 *** experiment results show that calibration factor of the SSNTD decreased with increasing humidity,because of increased stopping power of the moisture-absorbed film surface to α***,the calibration factor K should be corrected from the calculated result.

关键词： SSNTD 原子核物理学能级原子核

A Multi-module Controller for Walking Quadruped Robots

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2019年第2期16卷 253-263页

作者： Boxing Wang Ziwei Wan chunlin zhou Jun Wu Yanfeng Qiu Zhijun Gao College of Control Science and Engineerings Zhejiang University Zhejiang 310027China Binhai Industrial Technology Research Institute of Zhejiang University Tianjin 300457China

Motion control based on biologically inspired methods,such as Central Pattern Generator(CPG)models,offers a promising technique for robot ***,for a quadruped robot which needs to maintain balance while performing flexible movements,this technique often requires a complicated nonlinear oscillator to build a controller,and it is difficult to achieve agility by merely modifying the predefined limit cycle in real *** this study,we tried to solve this problem by constructing a multi-module controller based on *** different parallel modules will ensure the dynamic stability and agility of *** the proposed controller,a specific control task is accomplished by adding basic and superposed *** basic motions decide the basic foot end trajectories,which are generated by the predefined limit cycle of the CPG *** to conventional kinematics-based design,the superposed motions are generated through different modules alter the basic foot end trajectories to maintain balance and increase *** a considerable stability margin can be achieved,different modules are designed *** proposed CPG-based controller is capable of stabilizing a walking quadruped robot and performing start and stop movements,turning,lateral movement and reversal in real *** and simulations demonstrate the effectiveness of the method.

关键词： Central Pattern Generator(CPG) open-loop stability agile locomotion control quadruped robots

Multifunctional 2-(2-hydroxyphenyl)benzoxazoles: Ready synthesis,mechanochromism, fluorescence imaging, and OLEDs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第10期35卷 223-227页

作者： Kangmin Wang Liqiu Wan Jingyu Wang chunlin zhou Ke Yang Liang zhou Bijin Li Chongqing Key Laboratory of Natural Product Synthesis and Drug Research School of Pharmaceutical SciencesChongqing UniversityChongqing 401331China jiangsu Key Laboratory of Advanced Catalytic Materials&Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Triphenylamine(TPA)-containing 2-(2-hydroxyphenyl)benzoxazoles(2a-2c)have been synthesized via a highly efficient rhodium-catalyzed C–H/C–H cross-coupling *** 2a is a novel mechanofluorochromic material with blue-shifted mechanochromic *** 2b and 2c presented opposite mechanochromic *** 2b,the enol-form emission enhanced,and the ketoform emission blue-shift after *** contrast,2c exhibited the weak enol-form emission disappeared and the keto-form emission slightly red-shift after grinding *** estrone-containing2b-based water-dispersed nanoparticles(NPs)exhibit apparent dual-emission and were applied for fluorescence *** addition,bis(TPA)-containing 2c-based devices exhibit dual-emission with good performance and a singlet exciton yield of 92%,which breaks through the theoretical upper limit of 25%in conventional fluorescent *** is one of the highest exciton utilization values recorded for the ESIPT molecules with a dual emission system.

关键词： Rhodium-catalyzed 2-(2'-Hydroxyphenyl)benzoxazoles Mechanochromism Fluorescence images OLEDS

Untethered quadrupedal hopping and bounding on a trampoline

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mechanical Engineering 2020年第2期15卷 181-192页

作者： Boxing WANG chunlin zhou Ziheng DUAN Qichao ZHU Jun WU Rong XIONG State Key Laboratory of Industrial Control Technology College of Control Science and EngineeringZhejiang UniversityHangzhou 310027China Binhai Industrial Technology Research Institute of Zhejiang University Tianjin 300301China

For quadruped robots with springy legs,a successful jump usually requires both suitable elastic parts and well-designed control ***,these two problems are mutually restricted and hard to solve at the same *** this study,we attempt to solve the problem of controller design with the help of a robot without any elastic mounted parts,in which the untethered robot is made to jump on a *** differences between jumping on hard surfaces with springy legs and jumping on springy surfaces with rigid legs are briefly *** intuitive control law is proposed to balance foot contact forces;in this manner,excessive pitch oscillation during hopping or bounding can be *** height is controlled by tuning the time delay of the leg *** with other motion generators based on kinematic law,the robot can perform translational and rotational movements while hopping or bounding on the *** are conducted to validate the effectiveness of the proposed control framework.

关键词： hopping and bounding gait compliant mechanism compliant contact balance control strategy legged locomotion control quadruped robot

Dearomative spirocyclization via visible-light-induced reductive hydroarylation of non-activated arenes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第1期33卷 225-228页

作者： Zhuomin Chi Yuzhen Gao Lei Yang chunlin zhou Meng Zhang Peiming Cheng Gang Li College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350117China Key Laboratory of Coal to Ethylene Glycol and Its Related Technology Center for Excellence in Molecular SynthesisFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

A visible-light-induced spirocyclizative hydroarylation via reductive dearomatization of a series of non activated arenes including 2-phenyl indoles and naphthalene derivatives under mild conditions is de *** intriguing chemoselective dearomative hydroarylation of 2-phenyl indoles is *** dearomative hydroarylation protocol rapidly delivers valuable spirocycles with carbon-carbon doub bonds from readily accessible aromatic precursors in a single step.

关键词： Visible-light-induced Non-activated arene Spirocyclization Dearomatization Reductive hydroarylation

Development of an onsite calibration device for robot manipulators

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2023年第2期24卷 217-230页

作者： Ziwei WAN chunlin zhou Haotian ZHANG Jun WU College of Control Science and Engineering Zhejiang UniversityHangzhou310063China Huzhou Institute of Zhejiang University Huzhou313098China Binjiang Institute of Zhejiang University Hangzhou310014China School of Information and Software Engineering University of Electronic Science and Technology of ChinaChengdu610054China

A novel in-contact three-dimensional(3D)measuring device,called MultiCal,is proposed as a convenient,low-cost(less than US$5000),and robust facility for onsite kinematic calibration and online measurement of robot manipulator *** device hasμm-level accuracy and can be easily embedded in robot *** the calibration procedure,the robot manipulator first moves automatically to multiple end-effector orientations with its tool center point(TCP)constrained on a fixed point by a 3D displacement measuring device(single point constraint),and the corresponding joint angles are ***,the measuring device is precisely mounted at different positions using a well-designed fixture,and the above measurement process is repeated to implement a multi-point *** relative mounting positions are accurately measured and used as prior information to improve calibration accuracy and *** results of theoretical analysis indicate that MultiCal reduces calibration accuracy by 10%to 20%in contrast to traditional non-contact 3D or six-dimensional(6D)measuring devices(such as laser trackers)when subject to the same level of artificial measurement *** results of a calibration experiment conducted on a Staubli TX90 robot show that MultiCal has only 7%to 14%lower calibration accuracy compared to a measuring arm with a laser scanner,and 21%to 30%lower time efficiency compared to a 6D binocular vision measuring system,yielding maximum and mean absolute position errors of 0.831 mm and 0.339 mm,respectively.

关键词： Calibration device Kinematic calibration Onsite calibration Absolute accuracy

WALK-ASSISTING BALANCE SYSTEM OF THE EXOSKELETON ROBOT FOR DISABLED PEOPLE

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2004年第2期17卷 263-267页

作者： Yin Yuehong zhou chunlin Song Jiaren Chen Shiyi Han Tianpu zhou Chen Research Institute of Robotics,Shanghai Jiaotong University,Shanghai 200030, China Research Institute of Robotics Shanghai Jiaotong University 上海 200030

A novel methodology for a walk-assisting balance system of the exoskeleton robot for dis-abled people is presented. The experiment on the walk-assisting balance system is implemented using amini-type ropewalker robot. The mechanism of the ropewalker robot is designed, its dynamic model isbuilt, and its control system based on PWM is developed. The emulations in Matlab and the results ofexperiments prove that this methodology is effective.

关键词： Balance system Ropewalker robot Exoskeleton robot

Spirocyclizative Remote Arylcarboxylation of Nonactivated Arenes with CO_(2) via Visible-Light-Induced Reductive Dearomatization

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2022年第5期4卷 1565-1576页

作者： Yuzhen Gao Hao Wang Zhuomin Chi Lei Yang chunlin zhou Gang Li Key Laboratory of Coal to Ethylene Glycol and Its Related Technology Center for Excellence in Molecular SynthesisFujian Institute of Research on the Structure of MatterUniversity of Chinese Academy of SciencesChinese Academy of SciencesFuzhouFujian 350002 College of Chemistry and Materials Science Fujian Normal UniversityFuzhouFujian 350117 Frontiers Science Center for Transformative Molecules Shanghai Jiao Tong UniversityShanghai 200240

Visible-light-induced reductive dearomatization of nonactivated arenes is a very challenging transformation and remains in its ***,we report a novel strategy to achieve a visible-light-induced spirocyclizative remote arylcarboxylation of nonactivated arenes including naphthalenyl-and phenyl-bearing aromatics with CO_(2) under mild conditions through a radical-polar crossover cascade(RPCC).This reductive dearomatization protocol rapidly delivers a broad range of spirocyclic and valuable carboxylic acid derivatives from readily accessible aromatic precursors with generally good regioselectivity and chemoselectivity.

关键词： carbon dioxide utilization nonactivated arene dearomatization photocatalysis spirocyclization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于浑沌特征的柴油机状态振动监测

振动与冲击 2000年第2期19卷 46-49页

作者：周春林湖南省水电工程总公司长沙410015

利用系统动力学行为的浑沌特征描述方法 ,即准相图、Poincare截面、Kolmogrov熵、关联维D2 和最大李指数λmax,通过一组柴油机机身振动信号的时间序列 ,对活塞

关键词：浑沌柴油机故障辨识振动监测