检索结果-南通市图书馆

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

复杂环境下仿蛇机器人的路径规划策略

兵器装备工程学报 2024年第7期45卷 28-37页

作者：李伟庆王永娟高云龙南京理工大学机械工程学院南京210094

为完成多障碍物复杂环境中的侦察任务,改善仿蛇机器人的路径搜索能力和提升自主决策能力,本文中提出了一种基于先验知识推理库强化学习的路径规划控制策略。首先,建立仿蛇机器人的运动模型和交互环境模型;其次,通过建立模糊逻辑先验知... 详细信息

为完成多障碍物复杂环境中的侦察任务,改善仿蛇机器人的路径搜索能力和提升自主决策能力,本文中提出了一种基于先验知识推理库强化学习的路径规划控制策略。首先,建立仿蛇机器人的运动模型和交互环境模型;其次,通过建立模糊逻辑先验知识推理库(FLIS)与Soft Actor-Critic(SAC)动作网络组成的动作分层选择模型,将输出动作空间进行离散化的方法来调整运动控制精度,提供奖惩机制指导机器人与环境模型进行交互,实现机器人运动自主决策的持续生成过程。仿真结果表明:在多障碍物环境中所提出的改进算法得到的运动控制策略收敛速度和鲁棒性明显提升,降低了训练探索次数,提高了机器人对复杂环境的适应性;试验验证了训练所生成的策略模型在真实环境中的可行性。

关键词：仿蛇机器人强化学习先验知识路径规划自主避障

在线全文

学校读者我要写书评

暂无评论

盐雾环境对典型步枪自动机运动影响

兵工学报 2024年第4期45卷 1082-1093页

作者：张贺黄毅刘科言李朋超顾桐光王永娟徐诚南京理工大学机械工程学院江苏南京210094 重庆建设工业(集团)有限责任公司重庆404100 中国兵器工业第208研究所北京102202

盐雾环境对自动步枪战术技术性能和作战效能有着重要影响,但目前对盐雾环境对自动机运动特性和故障的影响机理尚不明确。以某小口径自动步枪为试验对象,设计并进行盐雾全寿命试验,在每次盐雾后通过高速摄影非接触测量自动机运动、高精... 详细信息

盐雾环境对自动步枪战术技术性能和作战效能有着重要影响,但目前对盐雾环境对自动机运动特性和故障的影响机理尚不明确。以某小口径自动步枪为试验对象,设计并进行盐雾全寿命试验,在每次盐雾后通过高速摄影非接触测量自动机运动、高精度天平测量枪机框质量、簧力测试仪测量复进簧参数;对枪机框及导轨表面形貌特征进行拍照,统计全寿命过程中故障情况,获得自动机运动典型故障类型。研究结果表明:随着盐雾时间增长,枪机框质量逐渐增加;复进簧自由长度及预压力逐渐减小,工作压力先减小、后趋于平缓;自动机后坐到位速度先减小、后增大;复进开始及复进到位速度逐渐减小,且二者具有相同变化趋势。盐雾使自动机后座到位速度减小,自动机运动故障次数增多,盐雾环境引起的多参数变化对自动机故障频次影响明显。在试验研究的基础上,构建枪机框质量、复进簧参数、特征点速度随时间变化定量关系公式,为推断盐雾环境自动机运动件参数变化状况和分析其对故障的影响提供参考依据。

关键词：小口径步枪盐雾寿命试验自动机运动参数变化故障分析

维普期刊数据库博看期刊

Influence of nose-perturbation location on behavior of vortical flow around slender body at high incidence

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第7期52卷 1933-1946页

作者： XiaoRong Guan Cheng Xu yongjuan wang YaPing wang School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China

Response of the vortical flow around a slender body of revolution at high incidence to the shift of a single nose perturbation was investigated systematically using numerical methods. A minute geometric bump was employed to act as the nose perturbation, and all computations were performed for subsonic flows at incidence of 50°. The computational results show that the vortical flow is more sensitive to the perturbation located axially closer to the nose apex of a slender body. With perturbation shifting axially downstream away from nose apex, there is a critical axial location appearing. The vortical flow is less sensitive to the perturbation located axially closer to the critical axial location; when perturbation traverses axially around the critical axial location, the vortical flow switches between opposite asymmetric patterns. The eventual influence of perturbation axial location on the vortical flow lies on both its relative locations to nose apex and the critical axial location. The vortical flow is more sensitive to the perturbation located circumferentially farther away from the fore-and-aft symmetric plane of a slender body, and just the asymmetrically-located perturbation can provoke the vortical flow to asymmetry. With perturbation shifting circumferentially in sequence, the vortical flow varies by degrees in manner of a single periodicity. A convective-type of instability existing in the flow field is responsible for the influence of nose perturbation on the vortical flow.

关键词： slender body of revolution high-incidence aerodynamics asymmetric vortical flow nose perturbation critical location

A survey on cryptographic techniques for protecting big data security: present and forthcoming

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2022年第10期65卷 73-106页

作者： Siqi LU Jianhua ZHENG Zhenfu CAO yongjuan wang Chunxiang GU School of Cyberspace Security Information Engineering University Henan Key Laboratory of Network Cryptography Technology Institute of Security Technology Shanghai Key Laboratory of Trustworthy Computing East China Normal University Cyberspace Security Research Center Peng Cheng Laboratory Shanghai Institute of Intelligent Science and Technology Tongji University

Big data drive multidimensional convergence and profound innovations among industries and provide novel ways of exploring the world. As they significantly create economic and social value, big data meaningfully impact the implementation and management of information security and privacy *** technologies are used to protect the security and entire life cycle of big data. The demand for this technology is multiplied when the data are stored in the cloud. They are stored in the cloud in the form of ciphertext, and the driving requirement for data retrieval, sharing, and manipulation places the security of data at risk. The all-or-nothing approach of traditional cryptography systems cannot realize the release and processing of data information with flexible and increasingly fine granularity. Consequently, dealing with the relationship between privacy protection and data utilization, as well as navigating the blurry boundaries between subverting either plaintext or ciphertext, has become a research focus of the current cryptographic trend for protecting big data security. Presently, there are many studies designed to solve these ***, security requirements and source encryption mode for future big data systems and applications are elaborated. Then, focusing on the practical security and functionality of the big data life cycle, including storage, retrieval, sharing, calculation, statistical analysis, and utilization, the research being conducted based on those functions is reviewed. For each cryptographic technology that meets the requirement of each type of big data security or application, security and efficiency comments and sufficient comparison analyses of cryptography schemes or protocols are provided; moreover, the current general problems and development trends are expounded. Because the current innovative research on cryptographic technology was primarily based on the development or improvement of a single solution, the study on

关键词： big data security cryptographic techniques ciphertext-based data sharing and computing authenticated encryption functional encryption homomorphic encryption secure multi-party computing

复合噬菌体与枯草芽孢杆菌对肠道产气荚膜梭菌的抑制效果及免疫代谢功能

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

微生物学通报 2024年第3期51卷 985-1001页

作者：吴立婷黄偲偲张辉余祖功包红朵王永娟南京农业大学动物医学院江苏南京210095 江苏省农业科学院农产品质量安全与营养研究所、江苏省食品质量安全重点实验室-省部共建国家重点实验室培育基地江苏南京210014 江苏农牧科技职业学院江苏泰州225300

【背景】产气荚膜梭菌感染一直以来困扰着家禽养殖业,限抗以来感染率呈上升趋势。生物源噬菌体以其独特的抑菌作用、安全无残留等优点,已成为潜在的减抗关键技术之一。【目的】明确产气荚膜梭菌噬菌体、沙门氏菌噬菌体及枯草芽孢杆菌联... 详细信息

【背景】产气荚膜梭菌感染一直以来困扰着家禽养殖业,限抗以来感染率呈上升趋势。生物源噬菌体以其独特的抑菌作用、安全无残留等优点,已成为潜在的减抗关键技术之一。【目的】明确产气荚膜梭菌噬菌体、沙门氏菌噬菌体及枯草芽孢杆菌联用对蛋鸡养殖的增效作用,通过对肠道组织结构形态变化、产气荚膜梭菌消减和菌群多样性的分析,为家禽减抗养殖中细菌性疾病防控提供有效的减抗技术方案。【方法】选取105只260日龄海兰褐蛋鸡,随机分为5组:A:产气荚膜梭菌噬菌体SD72组;B:产气荚膜梭菌噬菌体SD72&枯草芽孢杆菌联用组;C:沙门氏菌噬菌体JDF1-6组;D:SD72/JDF1-6复合噬菌体&枯草芽孢杆菌联用组;E:空白对照组。连续饮水饲喂42 d后取盲肠内容物测定产气荚膜梭菌数量,观察肠道组织结构,通过16S rRNA基因扩增子测序分析明确肠道微生物的群落分布、多样性及代谢功能。【结果】与对照组相比,D组SD72/JDF1-6复合噬菌体&枯草芽孢杆菌联用组肠道中产气荚膜梭菌的数量减少1.48 log10(CFU/mL),空肠隐窝深度显著降低(P<0.05),绒毛高度/隐窝深度显著增大(P<0.05)。微生物多样性分析结果显示,各组盲肠菌群中均以厚壁菌门和变形菌门为主,在属水平上乳杆菌属(11.26%)相对丰度较高。血清免疫指标及代谢功能分析显示,IgA、IgG和IgM的含量显著提高(P<0.05),肠道微生物基因主要富集于Kyoto Encyclopedia of Genes and Genomes(KEGG)的遗传信息处理通路,其中D组在排泄系统和免疫疾病代谢相关通路中富集基因相对丰度高于对照组755.95%。【结论】复合噬菌体和枯草芽孢杆菌联用能够有效改善蛋鸡肠道健康,提高机体免疫水平,促进微生物组免疫疾病代谢相关基因表达,提高肠道菌群代谢功能,为家禽减抗健康养殖中细菌性疾病的防控提供重要的理论依据和生物资源。

关键词：蛋鸡噬菌体枯草芽孢杆菌产气荚膜梭菌肠道菌群

新城疫病毒F蛋白和禽致病性大肠杆菌OmpA嵌合蛋白的表达及双特异性抗体制备

在线全文

学校读者我要写书评

暂无评论

黑龙江畜牧兽医 2024年第1期 103-108页

作者：袁橙王永娟郭梦娇刘思琪周雨豪江苏农牧科技职业学院动物医学院江苏泰州225300 扬州大学兽医学院江苏扬州225009

为获得Ⅶ型新城疫病毒(Newcastle disease virus,NDV)融合蛋白(fusion protein,F蛋白)和O18型禽致病性大肠杆菌(avian pathogenic Escherichia coli,APEC)外膜基因A(outer-membrane proteases,OmpA)嵌合蛋白和双特异性抗体,试验首先采用基因合成技术获得Ⅶ型NDV F基因和O18型APEC的OmpA基因片段,使用同源重组技术将F基因插入到OmpA基因中,再将重组基因片段插入到原核表达载体pGEX-4T-1中构建嵌合表达质粒,对重组质粒中的插入基因序列进行测序鉴定;将序列正确的嵌合表达质粒转入大肠杆菌BL21(Rosetta)感受态细胞中,利用IPTG诱导嵌合蛋白表达,使用SDS-PAGE和Western-blot检验嵌合蛋白的表达情况;纯化嵌合蛋白后免疫兔获得抗血清,抗血清再经抗原亲和纯化层析柱纯化获得多克隆抗体,采用间接酶联免疫吸附试验(enzyme linked immunosorbent assay,ELISA)测定抗体效价。结果表明:成功合成了Fo和OmpA1、OmpA2基因片段,构建并表达了重组质粒pGEX-O1-Fo-O2,纯化后的嵌合蛋白O1FoO2在大肠杆菌中以包涵体形式存在,制备的多克隆抗体对O1FoO2的效价约为1.1×10^(6),对GST的效价约为4.1×10^(4)。说明制备的嵌合蛋白和双特异性抗体质量较好。

关键词：新城疫病毒F蛋白大肠杆菌OmpA蛋白嵌合蛋白原核表达多克隆抗体

在线全文

学校读者我要写书评

暂无评论

国内兽用抗菌药减量化使用措施

现代畜牧科技 2024年第1期 140-142页

作者：王永娟董亚青徐淑颖江苏农牧科技职业学院江苏泰州225300

兽用抗菌药物的过度使用在中国等许多国家引发抗菌药物耐药性和卫生风险的问题。为了有效应对该挑战,国内兽用抗菌药减量化使用策略应运而生。本文论述改善兽用抗菌药物使用实践和维护公共卫生方面的重要性,并提出政策和实践建议。通过... 详细信息

兽用抗菌药物的过度使用在中国等许多国家引发抗菌药物耐药性和卫生风险的问题。为了有效应对该挑战,国内兽用抗菌药减量化使用策略应运而生。本文论述改善兽用抗菌药物使用实践和维护公共卫生方面的重要性,并提出政策和实践建议。通过采取综合措施,可以更好地管理兽用抗菌药物的使用,降低抗菌药物滥用的风险,维护公共卫生,同时确保养殖业的可持续发展。

关键词：兽药抗菌措施耐药性

日粮添加三丁酸甘油酯对肉鸡生长性能、养分消化率和血清生化指标的影响

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

中国饲料 2024年第4期 45-48页

作者：卢炜杨海峰陈则东曹云王明灿殷韶杰王永娟江苏农牧科技职业学院江苏泰州225300

文章旨在研究日粮中添加不同水平三丁酸甘油酯对肉鸡综合性能的影响。本试验将160只体重相近、健康无病的1日龄肉鸡随机分为4组,每组4个重复。对照组肉鸡饲喂基础日粮。试验I、II和III组分别在基础日粮中添加1000、1500、2000mg/kg三丁... 详细信息

文章旨在研究日粮中添加不同水平三丁酸甘油酯对肉鸡综合性能的影响。本试验将160只体重相近、健康无病的1日龄肉鸡随机分为4组,每组4个重复。对照组肉鸡饲喂基础日粮。试验I、II和III组分别在基础日粮中添加1000、1500、2000mg/kg三丁酸甘油酯。预饲期7d,正试期42d。结果表明,与对照组相比,试验组肉鸡的42日龄体重和平均日增重显著增加(P 0.05);试验组干物质、粗蛋白质、粗纤维及能量的表观消化率均显著增加(P 0.05)。总的来讲,日粮中添加三丁酸甘油酯能有效改善肉鸡生长性能,提升养分表观消化率,改善血清生化指标,综合考虑,肉鸡日粮中三丁酸甘油酯的最适添加量为1500mg/kg。

关键词：三丁酸甘油酯肉鸡生长性能养分消化率血清生化指标

Spider web-like carbonized bacterial cellulose/MoSe_(2) nanocomposite with enhanced microwave attenuation performance and tunable absorption bands

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第3期14卷 738-746页

作者： Zhengjian Xu Man He Yuming Zhou Shuangxi Nie yongjuan wang Yao Huo Yifan Kang Ruili wang Ran Xu Hao Peng Xi Chen Jiangsu Optoelectronic Functional Materials and Engineering Laboratory School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing211189China Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control College of Light Industry and Food EngineeringGuangxi UniversityNanning530004China

It is essential to manufacture microwave absorbers with strong absorption as well as tunable absorption bands at a low filler ***,it remains challenging for pure biomass material to reach this goal without loading other ***_(2),as a transition metal chalcogenide with semiconductor properties,has emerged as a potential microwave absorber ***,bacterial cellulose(BC)-derived carbon nanofibers/MoSe_(2) nanocomposite was fabricated and phosphoric acid was used to dope phosphorus in BC,in which MoSe_(2) microspheres were dropped on the BC network like a dew-covered spider *** unique network structure enhances conductive loss and multiple reflections of the incident *** collocation of BC and MoSe_(2) is helpful to impedance match and introduces interfacial/dipolar polarization loss;moreover,the P-doping of BC helps to tune the absorption ***,the optimal reflection loss of undoped one reaches−53.33 dB with only 20 wt.%filler content,whose main absorption peaks focus on ***,after the P-doping of BC,the main absorption peaks move to Ku-band and the optimal reflection loss gets stronger(−66.84 dB)with the same filler *** absorption and tunable absorption bands can be realized,and thus wide frequency range is *** work is expected to enlighten future exploration of biomass carbon materials on high-performance microwave absorption materials.

关键词： bacterial cellulose MoSe_(2) network structure P-doped carbon tunable absorption band