检索结果-南通市图书馆

Origami-inspired folding assembly of dielectric elastomers for programmable soft robots

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2022年第2期8卷 73-83页

作者： yanhua sun Dengfeng Li Mengge Wu Yale Yang Jingyou Su Tszhung Wong Kangming Xu Ying Li Lu Li Xinge Yu Junsheng Yu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054People's Republic of China Chongqing Key Laboratory of Materials Surface&Interface Science Chongqing Co-Innovation Center for Micro/Nano Optoelectronic Materials and DevicesMicro/Nano Optoelectronic Materials and Devices International Science and Technology Cooperation Base of ChinaSchool of Materials Science and EngineeringChongqing University of Arts and SciencesChongqing 402160People's Republic of China Department of Biomedical Engineering City University of Hong KongHong Kong SAR 999077People's Republic of China

Origami has become an optimal methodological choice for creating complex three-dimensional(3D)structures and soft robots.The simple and low-cost origami-inspired folding assembly provides a new method for developing 3D soft robots,which is ideal for future intelligent robotic systems.Here,we present a series of materials,structural designs,and fabrication methods for developing independent,electrically controlled origami 3D soft robots for walking and soft manipulators.The 3D soft robots are based on soft actuators,which are multilayer structures with a dielectric elastomer(DE)film as the deformation layer and a laser-cut PET film as the supporting flexible frame.The triangular and rectangular design of the soft actuators allows them to be easily assembled into crawling soft robots and pyramidal-and square-shaped 3D structures.The crawling robot exhibits very stable crawling behaviors and can carry loads while walking.Inspired by origami folding,the pyramidal and square-shaped 3D soft robots exhibit programmable out-of-plane deformations and easy switching between two-dimensional(2D)and 3D structures.The electrically controllable origami deformation allows the 3D soft robots to be used as soft manipulators for grasping and precisely locking 3D objects.This work proves that origami-inspired fold-based assembly of DE actuators is a good reference for the development of soft actuators and future intelligent multifunctional soft robots.

关键词： robot folding dielectric

Hydrodynamic Lubrication of Elastic Foil Gas Bearing Using Over Relaxation Iteration Method and Non-Dimensional Equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2021年第5期17卷 917-929页

作者： Xiangxi Du yanhua sun School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an710049China

The purpose is to accurately predict the performance of foil bearing and achieve accurate results in the design of foil bearing structure.A new type of foil bearing with surface microstructure is used as experimental material.First,the lubrication mechanism of elastic foil gas bearing is analyzed.Then,the numerical solution process of the static bearing capacity and friction torque is analyzed,including the discretization of the governing equation of rarefied gas pressure based on the non-dimensional modified Reynolds equation and the over relaxation iteration method,the grid planning within the calculation range,the static solution of boundary parameters and static solution of the numerical process.Finally,the solution program is analyzed.The experimental data in National Aeronautics and Space Administration(NASA)public literature are compared with the simulation results of this exploration,so as to judge the accuracy of the calculation process.The results show that under the same static load,the difference between the minimum film thickness calculated and the test results is not obvious;when the rotor speed of the bearing is 60000 r/min,the influence of the boundary slip effect increases with the increase of the micro groove depth on the flat foil surface;when the eccentricity or the micro groove depth of the bearing increases,the bearing capacity will be strengthened.When the eccentricity is 6µm and 14µm,the viscous friction torque of the new foil bearing increases significantly with the increase of the depth of the foil micro groove,but when the eccentricity is 22µm,the viscous friction torque does not change with the change of the depth of the foil micro groove.It shows that the bearing capacity and performance of foil bearing are improved.

关键词： Over relaxation iteration method non-dimensional equation elastic foil gas bearing hydrodynamics lubrication characteristics

Muscle-inspired soft robots based on bilateral dielectric elastomer actuators

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2023年第5期9卷 245-254页

作者： Yale Yang Dengfeng Li yanhua sun Mengge Wu Jingyou Su Ying Li Xinge Yu Lu Li Junsheng Yu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)ChengduPR China Chongqing Key Laboratory of Materials Surface&Interface Science Chongqing Co-Innovation Center for Micro/Nano Optoelectronic Materials and DevicesMicro/Nano Optoelectronic Materials and Devices International Science and Technology Cooperation Base of ChinaSchool of Materials Science and EngineeringChongqing University of Arts and SciencesChongqingPR China Hong Kong Centre for Cerebro-Cardiovascular Health Engineering(COCHE) Hong KongSARChina Department of Biomedical Engineering City University of Hong KongHong KongSARChina

Muscle groups perform their functions in the human body via bilateral muscle actuation,which brings bionic inspiration to artificial robot design.Building soft robotic systems with artificial muscles and multiple control dimensions could be an effective means to develop highly controllable soft robots.Here,we report a bilateral actuator with a bilateral deformation function similar to that of a muscle group that can be used for soft robots.To construct this bilateral actuator,a low-cost VHB 4910 dielectric elastomer was selected as the artificial muscle,and polymer films manufactured with specific shapes served as the actuator frame.By end-to-end connecting these bilateral actuators,a gear-shaped 3D soft robot with diverse motion capabilities could be developed,benefiting from adjustable actuation combinations.Lying on the ground with all feet on the ground,a crawling soft robot with dexterous movement along multiple directions was realized.Moreover,the directional steering was instantaneous and efficient.With two feet standing on the ground,it also acted as a rolling soft robot that can achieve bidirectional rolling motion and climbing motion on a 2°slope.Finally,inspired by the orbicularis oris muscle in the mouth,a mouthlike soft robot that could bite and grab objects 5.3 times of its body weight was demonstrated.The bidirectional function of a single actuator and the various combination modes among multiple actuators together allow the soft robots to exhibit diverse functionalities and flexibility,which provides a very valuable reference for the design of highly controllable soft robots.

关键词： robot artificial dielectric

绿色金融能否赋能中国式现代化产业体系建设?——基于制造业服务化视角

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

财经理论与实践 2024年第2期45卷 9-16页

作者：孙英杰陈艳华林春辽宁大学金融与贸易学院辽宁沈阳110036

基于2002-2021年中国30个省(区、市)的面板数据,从制造业服务化视角入手尝试探讨绿色金融对我国现代化产业体系建设的赋能效应。研究发现,绿色金融对制造业服务化影响呈现先抑制后促进的U形关系,且表现出要素禀赋、产业结构以及市场化... 详细信息

基于2002-2021年中国30个省(区、市)的面板数据,从制造业服务化视角入手尝试探讨绿色金融对我国现代化产业体系建设的赋能效应。研究发现,绿色金融对制造业服务化影响呈现先抑制后促进的U形关系,且表现出要素禀赋、产业结构以及市场化程度的异质性特征。同时,受绿色技术创新和环境规制调节效应的影响,绿色金融可提前跨越拐点,赋能制造业服务化。鉴于此,应有重点、分阶段及分区域地加快推进绿色金融发展,推动企业绿色技术创新,并加强环境规制,助力绿色金融赋能中国式现代化产业体系建设。

关键词：绿色金融中国式现代化产业体系建设制造业服务化

Catalytic decarboxylation of fatty acid by iron-containing minerals in immature oil source rocks at low temperature

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第16期44卷 1523-1527页

作者： Zailong Zhang yanhua sun Yongxin Lao Wuzheng Lin Univ Petr Dongying 257062 Peoples R China

The catalytic activities of seven immature source rocks in China on fatty acid decar-boxylation for generating hydrocarbons have been evaluated by determinating the CO2 content from decarboxylation reaction of stearic acid. It has been found that the catalytic activities of immature source rocks mainly depend on the structure type of the minerals. In general,

关键词： immature oil source rock fatty acid mineral catalysis low temperature decarboxylation.

在线全文

学校读者我要写书评

暂无评论

妊娠合并糖尿病优质护理干预效果探究

糖尿病新世界 2024年第2期27卷 166-168,172页

作者：孙彦华汶上县人民医院门诊部山东济宁272500

目的分析优质护理对妊娠合并糖尿病患者的影响。方法选取2022年10月—2023年10月汶上县人民医院收治的106例妊娠合并糖尿病患者为研究对象,根据双盲法分为普通组、研究组,各53例;普通组实施普通护理,研究组实施优质护理。比较两组不... 详细信息

目的分析优质护理对妊娠合并糖尿病患者的影响。方法选取2022年10月—2023年10月汶上县人民医院收治的106例妊娠合并糖尿病患者为研究对象,根据双盲法分为普通组、研究组,各53例;普通组实施普通护理,研究组实施优质护理。比较两组不良情绪、自护能力、依从性。结果护理后,两组的焦虑评分均低于护理前,且研究组低于普通组,差异有统计学意义(P<0.05);护理后,两组的自护能力评分均高于护理前,且研究组高于普通组,差异有统计学意义(P<0.05);研究组的护理依从性高于普通组,差异有统计学意义(P<0.05)。结论优质护理能提升自护能力,改善妊娠合并糖尿病患者的情绪问题,使其深入了解妊娠糖尿病知识,从而提高自护能力及护理依从性。

关键词：糖尿病知识掌握度优质护理自护能力妊娠

双歧杆菌三联活菌胶囊对慢性乙肝后肝硬化患者肠道屏障功能及免疫功能的影响

在线全文

学校读者我要写书评

暂无评论

中国微生态学杂志 2024年第1期36卷 41-45,50页

作者：李超孙艳华王建成赵丽孙庆贺沧州市人民医院胃肠外科河北沧州061000 南皮县人民医院普通外科沧州市人民医院手术室沧州市人民医院血管外科

目的基于肠道菌群特征探讨双歧杆菌三联活菌胶囊对乙肝后肝硬化患者肠道屏障功能和免疫功能的作用。方法选择2019年1月至2022年12月到我院进行治疗的124例乙肝肝硬化患者作为研究对象,随机将患者分为对照组和观察组,每组62例。对照组患... 详细信息

目的基于肠道菌群特征探讨双歧杆菌三联活菌胶囊对乙肝后肝硬化患者肠道屏障功能和免疫功能的作用。方法选择2019年1月至2022年12月到我院进行治疗的124例乙肝肝硬化患者作为研究对象,随机将患者分为对照组和观察组,每组62例。对照组患者进行常规治疗,静脉滴注异甘草酸镁注射液,观察组患者在对照组基础上加用双歧杆菌三联活菌胶囊进行治疗。对患者治疗前后的总胆红素(TBIL)、谷草转氨酶(AST)和谷丙转氨酶(ALT)水平进行检测。收集患者治疗前后外周静脉血,应用FACScan流式细胞技术对患者自然杀伤(NK)细胞、CD3细胞和CD4细胞进行检测。收集患者治疗前后粪便样本,应用荧光定量聚合酶链式反应对患者体内肠球菌、双歧杆菌、乳杆菌、肠杆菌和拟杆菌数量进行检测。治疗前后应用高效液相色谱法记录患者尿液乳果糖/甘露醇排除比。应用酶联免疫吸附法对IL-9水平进行检测,应用流式细胞仪检测Th9细胞水平。记录患者治疗过程中不良反应情况。结果治疗后,两组患者的TBIL、AST和ALT水平均降低,且观察组降低更显著(均P<0.05)。治疗后,两组患者的CD3、CD4和NK细胞比例均有升高(均P<0.05),且观察组患者的CD3、CD4和NK细胞比例高于对照组(均P<0.05)。治疗后,相对于对照组,观察组患者的肠球菌和肠杆菌数量均较低,而拟杆菌、乳杆菌和双歧杆菌数量均较高(均P<0.05)。治疗后,两组患者的尿液乳果糖/甘露醇排除比均有降低,且观察组尿液乳果糖/甘露醇排除比低于对照组(P<0.05)。治疗后,两组患者IL-9水平和Th9细胞比例均降低(P<0.05),且观察组患者的IL-9水平和Th9细胞比例低于对照组(P<0.05)。两组患者治疗过程中均未出现药物不良反应。结论双歧杆菌三联活菌胶囊能够改善乙肝后肝硬化患者肠道菌群,而且能够改善患者肝功能以及肠道屏障功能和免疫功能。

关键词：肠道菌群双歧杆菌三联活菌肝硬化肠道屏障功能免疫功能

在线全文

学校读者我要写书评

暂无评论

青藏高原生态资产空间差异及其价值化潜力

生态学报 2024年第5期44卷 1808-1821页

作者：李平星高晨真罗艳华郭辉孙伟中国科学院南京地理与湖泊研究所南京210008 中国科学院流域地理学重点实验室南京210008

科学合理地开发生态资产、促进其价值转化,是发展生态经济、推动生态文明建设的重要举措,对于促进生态敏感地区人与自然和谐共生、保障高质量可持续发展具有现实意义。以青藏高原为研究区,基于土地利用类型及其质量,从资源实物和生态服... 详细信息

科学合理地开发生态资产、促进其价值转化,是发展生态经济、推动生态文明建设的重要举措,对于促进生态敏感地区人与自然和谐共生、保障高质量可持续发展具有现实意义。以青藏高原为研究区,基于土地利用类型及其质量,从资源实物和生态服务两个类别开展生态资产评估和空间分布研究,融合生态产品供给-需求理论评价生态资产价值化潜力,进而解析生态资产及其价值化潜力的空间匹配关系,提出促进生态资产价值化的科学建议。结果表明:青藏高原生态资产类型多样,空间集聚特征明显,生态资产综合指数热点区主要分布在中部的羌塘、青南和川西藏东等地区,冷点区则分布在南部的山地灌丛及周边地区;生态服务类资产指数与生态资产综合指数呈现类似的空间分布格局,资源实物类资产指数的格局随地形地貌和气候气象的不同而有所差异;生态资产价值化潜力受到区位交通、资源禀赋、经济社会发展条件等多重因素影响,川西藏东、青东祁连的东部边缘地带价值化潜力更高、热点区更为集聚。基于生态资产禀赋及其价值化潜力划分为高资产-高潜力、高资产-低潜力、低资产-高潜力、低资产-低潜力四种分区类型,针对性提出了加大生态保护力度、合理开发生态资源、完善交通和服务设施、差异化开发生态产品等政策建议。

关键词：生态资产价值化潜力空间格局绿色发展青藏高原

基于高空平台的边缘计算卸载:网络、算法和展望

在线全文

学校读者我要写书评

暂无评论

北京工业大学学报 2024年第3期50卷 348-361页

作者：孙恩昌李梦思何若兰张卉张延华北京工业大学信息学部北京100124 北京工业大学先进信息网络北京实验室北京100124

高空平台(high altitude platform,HAP)技术与多接入边缘计算(multi-access edge computing,MEC)技术的结合将MEC服务器部署区域由地面扩展到空中,打破传统地面MEC网络的局限性,为用户提供无处不在的计算卸载服务。针对基于HAP的MEC卸... 详细信息

高空平台(high altitude platform,HAP)技术与多接入边缘计算(multi-access edge computing,MEC)技术的结合将MEC服务器部署区域由地面扩展到空中,打破传统地面MEC网络的局限性,为用户提供无处不在的计算卸载服务。针对基于HAP的MEC卸载研究进行综述,首先,从HAP计算节点的优势、网络组成部分、网络结构、主要挑战及其应对技术4个方面分析基于HAP的MEC网络;其次,分别从图论、博弈论、机器学习、联邦学习等理论的角度对基于HAP的MEC卸载算法进行横向分析和纵向对比;最后,指出基于HAP的MEC卸载技术目前存在的问题,并对该技术的未来研究方向进行展望。

关键词：高空平台(high altitude platform HAP) 多接入边缘计算(multi-access edge computing MEC) 计算卸载图论博弈论机器学习