检索结果-南通市图书馆

Chinese Journal of Mechanical Engineering 2014年第5期27卷 919-927页

作者： LU Yi li xuepeng College of Mechanical Engineering Yanshan University Key Laboratory of Parallel Robot and Mechatronic System of Hebei Province Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education

It is significant to develop a robot hand with high rigidity by a 6-DOF parallel manipulator（PM）.However,the existing6-DOF PMs include spherical joint which has less capability of pulling force bearing,less rotation range and lower precision under alternately heavy loads.A novel 6-DOF PM with three planar limbs and equipped with three fingers is proposed and its kinematics and statics are analyzed systematically.A 3-dimension simulation mechanism of the proposed manipulator is constructed and its structure characteristics is *** kinematics formulae for solving the displacement,velocity,acceleration of the platform,the active legs and the fingers are *** statics formulae are derived for solving the active forces of PM and the finger *** analytic example is given for solving the kinematics and statics of proposed manipulator and the analytic solved results are verified by the simulation *** is proved from the error analysis of analytic solutions and simulation solutions that the derived analytic formulae are correct and provide the theoretical and technical foundations for its manufacturing,control and application.

关键词： parallel manipulator planar limbs finger kinematics statics

Effects of Pendular Waist on Gecko＇s Climbing： Dynamic Gait, Analytical Model and Bio-inspired Robot

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2017年第2期14卷 191-201页

作者： Wei Wang xuepeng li Shilin Wu Peihua Zhu Fei Zhao Robotics Institute Beihang University Beijing 100191 China CRRC Qingdao Sifang Co. Ltd. Qingdao 266111 China

Most quadruped reptiles, such as lizards, salamanders and crocodiles, swing their waists while climbing on horizontal or vertical surfaces. Accompanied by body movement, the centroid trajectory also becomes more of a zigzag path rather than a straight line. Inspired by gecko＇s gait and posture on a vertical surface, a gecko inspired model with one pendular waist and four active axil legs, which is called GPL model, is proposed. Relationship between the waist position, dynamic gait, and driving forces on supporting feet is analyzed. As for waist trajectory planning, a singular line between the supporting feet is found and its effects on driving forces are discussed. Based on the GPL model, it is found that a sinusoidal waist trajectory, rather than a straight line, makes the driving forces on the supporting legs smaller. Also, a waist close to the pygal can reduce the driving forces compared to the one near middle vertebration, which is in accord with gecko＇s body bending in the process of climbing. The principles of configuration design and gait planning are proposed based on theoretical analyses. Finally, a bio-inspired robot DracoBot is developed and both of the driving force measurements and climbing experiments reinforce theoretical analysis and the rationality of gecko＇s dynamic gait.

关键词： multi-legged robot wall-climbing robot dynamic gait pendular waist GPL model

Effect of sodium starch octenyl succinate-based Pickering emulsion on the physicochemical properties of hairtail myofibrillar protein gel subjected to multiple freeze-thaw cycles

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第2期13卷 1018-1028页

作者： Huinan Wang Jiaxin Zhang Xinran liu Jinxiang Wang xuepeng li Jianrong li Key Laboratory of Food Nutrition and Safety Ministry of EducationCollege of Food Science and EngineeringTianjin University of Science and TechnologyTianjin 300457China College of Food Science and Technology Bohai UniversityNational R&D Branch Center of Surimi and Surimi Products ProcessingJinzhou 121013China

A Pickering emulsion based on sodium starch octenyl succinate(SSOS)was prepared and its effects on the physicochemical properties of hairtail myofibrillar protein gels(MPGs)subjected to multiple freeze-thaw(F-T)cycles were *** whiteness,water-holding capacity,storage modulus(G')and texture properties of the MPGs were significantly improved by adding 1%-2%Pickering emulsion(Plix content decreased by 10.37%,while theβ-sheet content increased by 7.94%,compared to the *** F-T cycles,the structure of the MPGs was destroyed,with an increase in hardness and a decrease in whiteness and water-holding capacity,however,the quality degradation of MPGs was reduced with 1%-2%Pickering *** findings demonstrated that SSOS-Pickering emulsions,as potential fat substitutes,can enhance the gel properties and the F-T stability of MPGs.

关键词： Pickering emulsion Myofibrillar protein Gel properties Freeze-thaw stability Intermolecular interactions

Research on Gliding Aerodynamic Effect of Deformable Membrane Wing for a Robotic Flying Squirrel

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2018年第2期15卷 379-396页

作者： xuepeng li Wei Wang Yifan Tang linqing Wang Tao Bai Fei Zhao Yushen Bai Robotics Institute Beihang University Beijing 100191 China School of Energy and Power Engineering Beihang University Beijing 100191 China Ministry-of-Education Key Laboratory of Fluid Mechanics Beihang University Beijing 100191 China Department of Mechanical and Aerospace Engineering University of California San Diego CA 92093 USA

Inspired by creatures with membrane to obtain ultra-high gliding ability, this paper presents a robotic flying squirrel （a novel gliding robot） characterized as membrane wing and active membrane deformation. For deep understanding of membrane wing and gliding mechanism from a robotic system perspective, a simplified blocking aerodynamic model of the deformable membrane wing and CFD simulation are finished. In addition, a physical prototype is developed and wind tunnel experiments are carried out. The results show that the proposed membrane wing is able to support the gliding action of the robot. Meanwhile, factors including geometry characteristics, material property and wind speed are considered in the experiments to investigate the aerodynamic effects of the deformable membrane wing deeply. As a typical characteristic of robotic flying squirrel, deformation modes of the membrane wing not only affect the gliding ability, but also directly determine the effects of the posture adjustment. Moreover, different deformation modes of membrane wing are illustrated to explore the possible effects of active membrane deformation on the gliding performance. The results indicate that the deformation modes have a significant impact on posture adjustment, which reinforces the rationality of flying squirrel＇s gliding strategy and provides valuable information on prototype optimal design and control strategy in the actual gliding process.

关键词： robotic flying squirrel deformable membrane wing active membrane deformation gliding mechanism bionic robot

Effect of Tea Polyphenols on lipid Oxidation of Nemipterus VirgatusSurimi Cake During Ice Storage

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2021年第3期28卷 9-16页

作者： Quanfu Wang Yifan Wang Yanhua Hou Yatong Wang Yujin li xuepeng li School of Environment Harbin Institute of TechnologyHarbin 150090China School of Marine Science and Technology Harbin Institute of Technology(Weihai)Weihai 264209ShandongChina Shandong Provincial Engineering Technology Research Center of Marine Health Food Rongcheng 264300ShandongChina College of Food Science and Technology Bohai UniversityJinzhou 121013LiaoningChina

Surimi cake is a high value aquatic product. In this work, lipid oxidation and volatile compounds in Nemipterus virgatus surimi cake were investigated to evaluate the effectiveness of tea polyphenols in preventing or reducing lipid oxidation. Surimi cake was prepared in the presence or absence of 0.2% tea polyphenols, and was stored at 4 ℃ for 16 days. It was found that the peroxide value(POV) and thiobarbituric acid reactive substances(TBARS) values of the experimental groups(with 0.2% tea polyphenols) were much lower than those of the untreated surimi cake(plipid oxidation of the surimi cake. Effects of lipid oxidation of the tea polyphenols on surimi cake were reduced during storage in ice.

关键词： surimi cake lipid oxidation tea polyphenols POV TBARS

Comparative metabolomics reveal histamine biodegradation mechanism by salt stressed Bacillus subtilis JZXJ-7

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年

作者： Rundong Wang Yijia Deng Yuhao Zhang xuepeng li Ravi Gooneratne Jianrong li College of Food Science and Engineering， lingnan Normal University College of Food Science， Southwest University College of Food Science and Engineering， Bohai University Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing Department of Wine， Food and Molecular Biosciences， Faculty of Agriculture and life Sciences， lincoln University Lincoln 7647， New Zealand

Bacillus subtilis (B. subtilis) JZXJ-7 isolated from shrimp paste can significantly degrade histamine under salt stress but the mechanism is unclear. This study aims to evaluate the effect of 170 and 340 mmol/L NaCl on B. subtilis JZXJ-7 growth， histamine degradation， antioxidant enzymes [catalase (CAT)， superoxide dismutase (SOD) and glutathione S-transferase (GST)] activities and Na+， K+-ATPase activity. Furthermore， comparative metabolomics was used to investigate histamine biodegradation mechanism by *** JZXJ-7 subjected to salt stress. Both 170 and 340 mmol/L NaCl promoted B. subtilis JZXJ-7 growth in late stages of reproduction (32 - 48 h)， increased histamine degradation rate by 64.85% and 79.87% (P lites (33.39%)， benzene and substituted derivatives (12.05%)， heterocyclic compounds (10.62%)， organic acids and derivatives (9.75%)， aldehydes， ketones， esters (5.59%) and nucleotides and its metabolites (4.58%). Metabolite set enrichment analysis revealed NaCl induced differential metabolic pathways of D-glutamine， D-glutamate， L-arginine， L-proline， histidine and glycerophospholipids， L-lysine degradation， and aminoacyl-tRNA biosynthesis. Exposure to 340 mmol/L NaCl up-regulated carbohydrate， glutathione and glycerophospholipid metabolism. The new insights into the mechanism of salt stress to promote B. subtilis JZJX-7 growth， energy metabolic pathways and to degrade histamine provide the theoretical basis for application of B. subtilis JZXJ-7 in food fermentation industry.

关键词：

QUADRATIC SYSTEM WITH HOMOCliNIC CYCLE DESCRIBED BY SEXTIC CURVE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Annals of Differential Equations 2005年第3期21卷 331-336页

作者： lin Xueru li xuepeng College of Math. and Computer Science Fuzhou University Fuzhou 350002 College of Math. and Computer Science Fujian Normal University Fuzhou 350007

In [2-5], cubic, quartic or quintic homoclinic cycles are found. In this paper, we present a quadratic system with homoclinic cycle which is described by a sextic curve.

关键词： quadratic system homoclinic cycle algebratic invariant curve

THE QUADRATIC SYSTEM WITH NONHYPERBOliC HOMOCliNIC CYCLE

在线全文

学校读者我要写书评

暂无评论

Annals of Differential Equations 2005年第3期21卷 403-406页

作者： Song Xiujuan Zheng Yanhong li xuepeng Dept. of Math. Fujian Normal University Fuzhou 350007

In this paper, we will show some sufficient conditions to assert certain system existing nonhyperbolic homoclinic cycles.

关键词： quadratic systems nonbyperbolic homoclinic cycles lie group

POSITIVE PERIODIC SOLUTION OF A PREDATOR-PREY SYSTEM WITH TIME DELAY

在线全文

学校读者我要写书评

暂无评论

Annals of Differential Equations 2007年第4期23卷 552-557页

作者： Yang Wensheng Bai Zijun, li xuepeng College of Math. and Computer Science Fujian Normal University Fuzhou 350007

By using continuation theorem in coincidence degree theory, we study the existence of positive periodic solution for a delay and mutual interference predatorprey system with functional response, and obtain sufficient ... 详细信息

关键词： functional response time delay mutual interference positive periodic solution coincidence degree

Modeling and Analysis of EEG Brain Network in High Altitude Task State

在线全文

学校读者我要写书评

暂无评论

国际计算机前沿大会会议论文集 2021年第1期 468-480页

作者： Yao Ma Lei Wang Yu Yang xuepeng li Zeng Xu Haifang li Taiyuan University of Technology Taiyuan 030024China

Long-term exposure to high altitude,low pressure and low oxygen will seriously threaten people’s cognitive *** explore the changes in wholebrain network dynamics during brain activity in long-term high-altitude migrants,EEG signals from three subjects of 75 different altitudes were analyzed using the Stroop experimental paradigm and the network recombination prediction *** sliding window method was used to explore the dynamic change process of the brain *** the same time,the time period with significant difference between the brain networks of the altitude group was selected as the real response network to measure the model prediction ***,according to different network prediction model rules,the weights of brain network 200 ms before stimulation were updated for each ***,the prediction model with the least difference between the prediction network and the real response network was selected for each *** experimental results showed that the prediction accuracy of the model reach 98.95%,and there is a significant difference in model selection between the elevation *** helps to understand the brain dynamics of healthy people,and reveals the abnormal changes in the brain networks of those who have stayed at high altitude for a long time,providing an important reference for the cognitive rehabilitation training of victims ex-posed at high altitude.

关键词： High altitude EEG Dynamic brain network Task state Prediction model