检索结果-南通市图书馆

Defence Technology（防务技术） 2024年第2期32卷 254-261页

作者： Benfeng Gu haiyuan li Baoming li National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing 210094China

To accelerate the practicality of electromagnetic railguns,it is necessary to use a combination of threedimensional numerical simulation and experiments to study the mechanism of bore *** this paper,a three-dimensional numerical model of the augmented railgun with four parallel unconventional rails is introduced to simulate the internal ballistic process and realize the multi-physics field coupling calculation of the rail gun,and a test experiment of a medium-caliber electromagnetic launcher powered by pulse formation network(PFN)is carried *** test methods such as spectrometer,fiber grating and high-speed camera are used to test several parameters such as muzzle initial velocity,transient magnetic field strength and stress-strain of *** the simulation results and experimental data,the damage condition of the contact surface is analyzed.

关键词： Internal ballistic modeling Electromagnetic rail gun Multi-physics field coupling Experimental validation PFN

Genome-wide and candidate gene association studies identify BnPAP17 as conferring the utilization of organic phosphorus in oilseed rape

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第4期23卷 1134-1149页

作者： Ping Xu Hao li haiyuan li Ge Zhao Shengjie Dai Xiaoyu Cui Zhenning liu Lei Shi Xiaohua Wang College of Agriculture and Forestry Science Linyi UniversityLinyi 27600China National Key Laboratory of Crop Genetic Improvement/Microelement Research Centre/Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural Affairs/Huazhong Agricultural UniversityWuhan 430070China

Phosphorus(P)is essential for living plants,and P deficiency is one of the key factors limiting the yield in rapeseed production *** the most important organ for plants,root morphology traits(RMTs)play a key role in P *** investigate the genetic variability of RMT under low P availability,we dissected the genetic structure of RMTs by genome-wide association studies(GWAS),linkage mapping and candidate gene association studies(CGAS).A total of 52 suggestive loci were associated with RMTs under P stress conditions in 405 oilseed rape *** purple acid phosphatase gene BnPAP17 was found to control the lateral root number(LRN)and root dry weight(RDW)under low P *** expression of BnPAP17 was increased in shoot tissue in P-efficient cultivars compared to root tissue and P-inefficient cultivars in response to low P ***,the haplotype of BnPAP17^(Hap3)was detected for the selective breeding of P efficiency in oilseed ***-expression of the BnPAP17^(Hap3)could promote the shoot and root growth with enhanced tolerance to low P stress and organic phosphorus(Po)utilization in oilseed ***,these findings increase our understanding of the mechanisms underlying BnPAP17-mediated low P stress tolerance in oilseed rape.

关键词： genome-wide association studies(GWAS) root morphology traits(RMTs) organic phosphorus(Po) oilseed rape BnPAP17

微生态制剂对草鱼生产性能、肠道菌群及养殖水质的影响

在线全文

学校读者我要写书评

暂无评论

中国饲料 2024年第2期 63-66页

作者：李荣李海源天水市畜牧兽医局甘肃天水741000 天水市畜牧技术推广站甘肃天水741000

为研究微生态制剂(MicroecologicalPreparation,MP)对草鱼生产性能、肠道菌群及养殖水质的影响。试验将600尾初始体重相近,健康无病的草鱼随机分为4组,每组3个重复,每个重复50尾。其中,对照组(CON组)草鱼饲喂基础饵料,其余3组草鱼则在... 详细信息

为研究微生态制剂(MicroecologicalPreparation,MP)对草鱼生产性能、肠道菌群及养殖水质的影响。试验将600尾初始体重相近,健康无病的草鱼随机分为4组,每组3个重复,每个重复50尾。其中,对照组(CON组)草鱼饲喂基础饵料,其余3组草鱼则在基础饵料中分别添加2g/kg(MP2组)、4g/kg(MP4组)、6g/kg(MP6组)的微生态制剂,试验为期60d。结果显示,(1)与CON组相比,MP2组、MP4组草鱼的终末体重、增重率、胴体重均显著提高(P <0.05)。(2)与CON组相比,MP6组肠道乳酸菌数量显著提高(P <0.05),大肠杆菌数量显著降低(P <0.05)。(3)与CON组相比,MP6组水体中40、60d氨氮浓度均显著降低(P <0.05),MP2组、MP4组、MP6组水体中20、40、60d亚硝酸盐浓度均显著降低(P <0.05),MP6组水体中20、40、60d硫化氢浓度显著降低(P <0.05)。结论:基础饵料中添加中低水平(2、4g/kg)的微生态制剂能促进草鱼生长;基础饵料中添加高水平(6g/kg)的微生态制剂能改善肠道菌群,优化养殖水质,降低水质中的有害物质。

关键词：微生态制剂草鱼生产性能肠道菌群养殖水质

溶胶-凝胶SiO_(2)减反膜的制备与光学性能研究

在线全文

学校读者我要写书评

暂无评论

无机材料学报 2024年第5期39卷 525-530页

作者：沈斌张旭熊怀李海元谢兴龙中国科学院上海光学精密机械研究所高功率激光物理重点实验室上海201800 中国科学院大学材料与光电研究中心北京100049

碱催化溶胶-凝胶多孔SiO_(2)减反膜具有优异的光学性能及抗激光损伤性能,是高功率激光装置中的重要组成部分,但其与光学元件之间的结合强度低,使得膜层易发生接触破坏。本研究以“神光II”高功率激光装置溶胶-凝胶多孔SiO_(2)减反膜为基... 详细信息

碱催化溶胶-凝胶多孔SiO_(2)减反膜具有优异的光学性能及抗激光损伤性能,是高功率激光装置中的重要组成部分,但其与光学元件之间的结合强度低,使得膜层易发生接触破坏。本研究以“神光II”高功率激光装置溶胶-凝胶多孔SiO_(2)减反膜为基础,通过提拉法在其表层涂覆致密的SiO_(2)薄层后得到机械强度提升的双层SiO_(2)减反膜(SiO_(2)-MTES),并与常用的单层氨固化SiO_(2)减反膜(SiO_(2)-HMDS)进行相关应用性能的综合比较。结果表明,涂覆SiO_(2)-MTES的熔石英在约800 nm处的峰值透过率大于99.6%,运用1-on-1激光损伤阈值测试方法测得该双层SiO_(2)减反膜的零几率激光损伤阈值为51.9 J/cm^(2)(1064 nm,9.1 ns),与涂覆SiO_(2)-HMDS的性能相当。同时,SiO_(2)-MTES膜层与水的接触角达到117.3°,且在相对湿度大于90%的高湿环境中膜层的透过率较稳定。多次擦拭实验结果表明SiO_(2)-MTES的耐摩擦机械强度明显优于SiO_(2)-HMDS,有效提升了膜层与光学元件之间的结合强度。

关键词：溶胶-凝胶减反膜 SiO_(2) 机械强度

在线全文

学校读者我要写书评

暂无评论

模块化可重构三指灵巧手设计与抓取实验研究

应用基础与工程科学学报 2024年第4期32卷 1199-1210页

作者：张勤俭王鹏程魏建李海源李星帅北京信息科技大学机电工程学院北京100192 首都医科大学附属北京友谊医院北京100020 北京邮电大学智能工程与自动化学院北京100876

在服务和工业领域等非结构化环境中,因抓取对象、抓取部位、作业工艺等具备多样化、不确定等特点,灵巧地抓取物体是具有挑战性的.基于连杆传动机构,研制了一种新型的模块化可重构三指灵巧手.手指与手掌分别采用模块化设计,模块化手指的... 详细信息

在服务和工业领域等非结构化环境中,因抓取对象、抓取部位、作业工艺等具备多样化、不确定等特点,灵巧地抓取物体是具有挑战性的.基于连杆传动机构,研制了一种新型的模块化可重构三指灵巧手.手指与手掌分别采用模块化设计,模块化手指的两个关节均采用连杆传动,有效减小了手指体积,同时可以获得较大的指尖力,降低了制造维护的复杂性.可重构手掌可以变换模块化手指的空间位置,对不同抓取目标形成最优的抓取姿势.其具有以下特点:7个主动自由度,指尖力为25N,有效载荷为5kg,重量为1.55kg,体积小巧,具有力感知能力且易于集成.日常生活用品与工具的抓取实验验证了灵巧手的有效性和灵巧性.结果表明,模块化可重构三指灵巧手可以灵巧地抓取和操作日常生活用品和工具,可有效满足服务与工业领域中灵巧抓取的需求.

关键词：多指灵巧手模块化设计可重构连杆传动抓取实验

An internal ballistic model of electromagnetic railgun based on PFN coupled with multi-physical fi eld and experimental validation

在线全文

学校读者我要写书评

暂无评论

Self-assembly control and experiments in swarm modular robots

Defence technology 2024年第2期

作者： Benfeng Gu haiyuan li Baoming li

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第4期55卷 1118-1131页

作者： WEI HongXing li haiyuan TAN JinDong WANG TianMiao School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Electrical Engineering Department Michigan Technological UniversityHoughton 49931USA

This paper presents a self-assembly control strategy for the swarm modular robots. Simulated and physical experiments are conducted based on the Sambot platform, which is a novel self-assembly modular robot having the characteristics of both the chain-type and the mobile self-reconfigurable robots. Multiple Sambots can autonomously move and connect with one another through self-assembly to form robotic organisms. The configuration connection state table is used to describe the configuration of the robotic structure. A directional self-assembly control model is proposed to perform the self-assembly experiments. The self-assembly process begins with one Sambot as the seed, and then the Docking Sambots use a behavior-based controller to achieve connection with the seed Sambot. The controller is independent of the target configuration. The seed and connected Sambots execute a configuration comparison algorithm to control the growth of the robotic structure. Furthermore, the simul- taneous self-assembly of multiple Sambots is discussed. For multiple configurations, self-assembly experiments are conducted in simulation platform and physical platform of Sambot. The experimental results verify the effectiveness and scalability of the self-assembly algorithms.

关键词： self-reconfigurable robot modular robot swarm robot self-assembly behavior-based control

A Review of Smart Materials for the Boost of Soft Actuators,Soft Sensors,and Robotics Applications

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2022年第2期35卷 12-27页

作者： Yufei Hao Shixin Zhang Bin Fang Fuchun Sun Huaping liu haiyuan li School of mechanical engineering University of Science and Technology BeijingBeijing 100083China School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China Department of Computer Science and Technology Tsinghua National Laboratory for Information Science and TechnologyTsinghua UniversityBeijing 100084China School of Automation Beijing University of Posts and TelecommunicationsBeijing 100876China

With the advance of smart material science,robotics is evolving from rigid robots to soft *** to rigid robots,soft robots can safely interact with the environment,easily navigate in unstructured fields,and be minimized to operate in narrow spaces,owning to the new actuation and sensing technologies developed by the smart *** the review,different actuation and sensing technologies based on different smart materials are analyzed and *** to the driving or feedback signals,actuators are categorized into electrically responsive actuators,thermally responsive actuators,magnetically responsive actuators,and photoresponsive actuators;sensors are categorized into resistive sensors,capacitive sensors,magnetic sensors,and optical waveguide *** introducing the principle and several robotic prototypes of some typical materials in each category of the actuators and *** advantages and disadvantages of the actuators and sensors are compared based on the categories,and their potential applications in robotics are also presented.

关键词： Smart material Soft robot Actuator Sensor

在线全文

学校读者我要写书评

暂无评论

穿刺机器人超声标定技术及体模研究现状

北京信息科技大学学报（自然科学版） 2024年第5期39卷 23-31,39页

作者：褚浩杰李海源张勤俭北京信息科技大学机电工程学院北京100192 北京邮电大学智能工程与自动化学院北京100876

对超声引导的穿刺手术机器人的超声标定技术及其不同标定模型进行了分析研究。首先比较了磁导航定位系统、光导航定位系统以及光磁协同导航定位系统各自的优势和不足;然后介绍了超声标定算法,综述了点模型、线模型、面模型和无标定模型... 详细信息

对超声引导的穿刺手术机器人的超声标定技术及其不同标定模型进行了分析研究。首先比较了磁导航定位系统、光导航定位系统以及光磁协同导航定位系统各自的优势和不足;然后介绍了超声标定算法,综述了点模型、线模型、面模型和无标定模型的研究现状;最后从精密度、准确度、操作难度、适用范围等几个方面对标定模型进行了比较。

关键词：超声标定穿刺机器人体模定位导航

江西省猕猴桃褐斑病发生情况、病原鉴定与高效药剂筛选

在线全文

学校读者我要写书评

暂无评论

果树学报 2024年第10期41卷 2067-2078页

作者：李海源李娟胡妍月孙杨葛翠莲陈小留石丽娟黄水金江西省农业科学院植物保护研究所·农业面源污染防控与废弃物综合利用江西省重点实验室南昌330200 武宁县农业技术推广中心江西武宁332300 玉山县经济作物局江西玉山334700 寻乌县果业发展服务中心江西寻乌342200

【目的】明确江西省猕猴桃褐斑病发生情况及其病原,筛选能有效抑制病原的杀菌剂,为猕猴桃褐斑病防控提供新的依据。【方法】以猕猴桃褐斑病为研究对象,调查江西省猕猴桃褐斑病发生情况。对褐斑病主要流行区的病叶进行病原分离,通过科赫... 详细信息

【目的】明确江西省猕猴桃褐斑病发生情况及其病原,筛选能有效抑制病原的杀菌剂,为猕猴桃褐斑病防控提供新的依据。【方法】以猕猴桃褐斑病为研究对象,调查江西省猕猴桃褐斑病发生情况。对褐斑病主要流行区的病叶进行病原分离,通过科赫氏法则验证、形态观察和分子鉴定确定病原。采用菌丝生长速率法对9种药剂进行室内毒力测定。【结果】猕猴桃褐斑病在赣西和赣北发生严重,11个调查点位中5个点位发病等级中值在5级及以上;猕猴桃褐斑病在赣东和赣南发生较轻,10个调查点位的发病等级中值均为0。通过科赫氏法则验证、形态观察和分子鉴定,确定病原为多主棒孢(Corynespora cassiicola)。室内药剂毒力测定结果表明,丙硫菌唑、环丙唑醇、克菌丹和腈菌唑对猕猴桃褐斑病菌具有极强的抑制作用,EC_(50)分别为17.36,6.97,5.30和2.50μg·mL^(-1)。【结论】猕猴桃褐斑病在赣北和赣西发生严重,病原鉴定为多主棒孢;丙硫菌唑、环丙唑醇、克菌丹和腈菌唑可作为猕猴桃褐斑病防治的潜在高效药剂。

关键词：猕猴桃褐斑病病情调查病原菌鉴定多主棒孢药剂筛选

维普期刊数据库博看期刊