检索结果-南通市图书馆

Mitogenomic phylogeny,biogeography,and cryptic divergence of the genus Silurus(Siluriformes:Siluridae)

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2024年第4期45卷 711-723页

作者： Weitao Chen Nicolas Hubert yuefei li Shuli Zhu Jun {3. Denggao Xiang Shang Gao Chunni Kou Jilong {3. Tai {3. Zhiqiang liang Junjie Wu Xinhui li Jie li Pearl River Fisheries Research institute Chinese Academy of Fishery SciencesGuangzhouGuangdong 510380China china Key Laboratory of Aquatic Animal Immune Technology of Guangdong Province GuangzhouGuangdong 510380China Key Laboratory of Prevention and Control for Aquatic Invasive Alien Species Ministry of Agriculture and Rural AffairsGuangzhouGuangdong 510380China Scientific Observing and Experimental Station of National Fisheries Resources and Environment GuangzhouGuangdong 510380China Institut de Recherche pour le Développement MontpellierUMR 226 ISEM(UM-CNRS-IRD)France State Key Laboratory of Eco-hydraulic in Northwest Arid Region of china Xi’an University of TechnologyXi’anShaanxi 710048China Heilongjiang River Fisheries Research institute Chinese Academy of Fishery SciencesHarbinHeilongjiang 150076China Gansu Fisheries Research institute LanzhouGansu 730030China Hunan Fisheries Science institute ChangshaHunan 410153China Yunnan institute of Fishery sciences Research KunmingYunnan 650111China

The genus Silurus,an important group of catfish,exhibits heterogeneous distribution in Eurasian freshwater *** group includes economically important and endangered species,thereby attracting considerable scientific *** this interest,the lack of a comprehensive phylogenetic framework impedes our understanding of the mechanisms underlying the extensive diversity found within this ***,we analyzed 89 newly sequenced and 20 previously published mitochondrial genomes(mitogenomes)from 13.morphological species to reconstruct the phylogenetic relationships,biogeographic history,and species diversity of *** phylogenetic reconstructions identified eight clades,supported by both maximum-likelihood and Bayesian ***-based species delimitation analyses yielded multiple molecular operational taxonomic units(MOTUs)in several taxa,including the Silurus asotus complex(four MOTUs)and Silurus microdorsalis(two MOTUs),suggesting that species diversity is underestimated in the genus.A reconstructed time-calibrated tree of Silurus species provided an age estimate of the most recent common ancestor of approximately 3..61 million years ago(Ma),with divergences among clades within the genus occurring between 11.56 Ma and 29.4. Ma,and divergences among MOTUs within species occurring between 3.71 Ma and 11.56 *** reconstructions suggested that the ancestral area for the genus likely encompassed china and the Korean Peninsula,with multiple inferred dispersal events to Europe and Central and Western Asia between 21.78 Ma and 26.67 Ma and to Japan between 2.51 Ma and 18.4. *** factors such as the Eocene-Oligocene extinction event,onset and intensification of the monsoon system,and glacial cycles associated with sea-level fluctuations have likely played significant roles in shaping the evolutionary history of the genus Silurus.

关键词： Maximum likelihood Bayesian inferences Ancestral area estimation Cryptic diversity Dispersal pathways Mitogenomes Sea levels

考虑输入饱和的空间飞行器姿态神经鲁棒自适应滑模控制

在线全文

学校读者我要写书评

暂无评论

宇航学报 2024年第8期45卷 1269-1280页

作者：李成洋王伟耿宝魁胡宽容王雨辰北京理工大学宇航学院北京100081 无人机自主控制技术北京市重点实验室北京100081 西北工业集团有限公司西安710043

针对空间飞行器姿态跟踪控制过程中出现的执行器饱和、模型不确定性和未知外部扰动问题,提出了一种鲁棒自适应径向基函数神经网络(RBFNN)增强滑模控制方法。首先,基于四元数法建立空间飞行器姿态运动学和动力学模型,并针对未知外部扰动... 详细信息

针对空间飞行器姿态跟踪控制过程中出现的执行器饱和、模型不确定性和未知外部扰动问题,提出了一种鲁棒自适应径向基函数神经网络(RBFNN)增强滑模控制方法。首先,基于四元数法建立空间飞行器姿态运动学和动力学模型,并针对未知外部扰动建立非线性扰动观测器。其次,为了解决执行器饱和问题,引入高斯误差函数对控制器幅值进行约束,并以PID滑模控制为框架,对控制器进行设计。在控制器设计过程中,利用新型切换函数将鲁棒自适应控制和RBFNN进行结合,对模型不确定性进行逼近,并利用梯度下降法解决RBFNN权值优化问题。随后,基于Lyapunov理论证明闭环系统的有界性,并分析了闭环系统的收敛域。最后,通过仿真分析验证了所设计控制器的有效性和鲁棒性。

关键词：空间飞行器执行器饱和模型不确定扰动观测器 RBFNN

在线全文

学校读者我要写书评

暂无评论

拦截机动目标的固定时间事件触发协同制导律

北京理工大学学报 2024年第10期44卷 1040-1050页

作者：王鹏何智川李军智李虹言耿宝魁范卫鹏北京理工大学宇航学院北京100081 中国兵器工业试验测试研究院陕西西安714200 北京航空航天大学电子信息工程学院北京100191 西北工业集团有限公司陕西西安710043

针对无向通信拓扑结构下的多枚导弹考虑角度约束同时攻击机动目标的问题,提出一种事件触发控制下的固定时间收敛分布式多弹协同制导律.首先,建立导弹-目标相对运动学模型,在视线坐标系下解耦为沿视线和垂直视线两个方向.其次,在视线切... 详细信息

针对无向通信拓扑结构下的多枚导弹考虑角度约束同时攻击机动目标的问题,提出一种事件触发控制下的固定时间收敛分布式多弹协同制导律.首先,建立导弹-目标相对运动学模型,在视线坐标系下解耦为沿视线和垂直视线两个方向.其次,在视线切向考虑时间约束,提出一种基于事件触发机制的固定时间收敛协同制导律,保证攻击时间的一致性;在视线法向上考虑空间角度约束,提出一种基于固定时间收敛理论的分布式空间协同制导律,使视线角和视线角速率快速收敛到期望值,以满足脱靶量和终端角度约束;同时,针对目标机动引起的系统扰动,采用固定时间收敛的观测器进行在线估计与补偿.利用Lyapunov理论,证明了所提出协同制导律的稳定性.最后,通过数学仿真,验证了所提出的协同制导律的有效性.

关键词：协同制导事件触发控制固定时间收敛攻击时间及攻击角度约束机动目标

在线全文

学校读者我要写书评

暂无评论

压水堆二回路碱化剂与材料的相容性研究进展

中国腐蚀与防护学报 2024年第2期44卷 267-277页

作者：冀跃飞郝龙王俭秋李庆华郑跃于沛柯伟中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳110016 中国科学技术大学材料科学与工程学院沈阳110016 广东腐蚀科学与技术创新研究院广州510700 中国核电工程有限公司北京100083

综述了国内外压水堆二回路碱化剂的应用情况及其与二回路结构材料相容性的研究进展。首先介绍了碱化剂的国内外发展历程;其次,从材料类型、水化学、碱化剂物理化学性质等3.角度讨论了碱化剂与材料的相容性;最后,论述了碱化剂调节pH的原... 详细信息

综述了国内外压水堆二回路碱化剂的应用情况及其与二回路结构材料相容性的研究进展。首先介绍了碱化剂的国内外发展历程;其次,从材料类型、水化学、碱化剂物理化学性质等3.角度讨论了碱化剂与材料的相容性;最后,论述了碱化剂调节pH的原理,并详细介绍了有机胺分子与材料表面氧化膜间的作用机制。

关键词：二回路碱化剂水化学乙醇胺结构材料

Decomposition for a new kind of imprecise information system

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2018年第2期12卷 376-395页

作者： Shaobo DENG Sujie GUAN Min li Lei wang yuefei SUI School of Information Engineering Nanchang Institute of Technology Nanchang 330099 China Key Laboratory of Intelligent Information Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

In this paper, we first propose a new kind of imprecise information system, in which there exist conjunctions （∧＇s）, disjunctions （∨＇s） or negations （＇s）. Second, this paper discusses the relation that only contains ∧＇s based on relational database theory, and gives the syntactic and semantic interpretation for A and the definitions of decomposition and composition and so on. Then, we prove that there exists a kind of decomposition such that if a relation satisfies some property then it can be decomposed into a group of classical relations （relations do not contain ∧） that satisfy a set of functional dependencies and the original relation can be synthesized from this group of classical relations. Meanwhile, this paper proves the soundness theorem and the completeness theorem for this decomposition. Consequently, a relation containing ∧＇s can be equivalently transformed into a group of classical relations that satisfy a set of functional dependencies. Finally, we give the definition that a relation containing ∧＇s satisfies a set of functional dependencies. Therefore, we can introduce other classical relational database theories to discuss this kind of relation.

关键词： imprecise information systems decomposition composition soundness and completeness

Broad-spectrum and powerful neutralization of bacterial toxins by erythroliposomes with the help of macrophage uptake and degradation

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

Acta Pharmaceutica Sinica B 2022年第11期12卷 4235-4248页

作者： Chunying liu Shuangrong Ruan Ying He Xuejing li yuefei Zhu Honglan {3. Hanwei Huang Zhiqing Pang School of Pharmacy Fudan UniversityKey Laboratory of Smart Drug DeliveryMinistry of EducationShanghai 201203China The institute for Biomedical Engineering&Nano Science Tongji University School of MedicineShanghai 200092China Department of Biomedical Engineering Columbia UniversityNew YorkNY 10027USA institute of Hematology Union HospitalTongji Medical CollegeHuazhong University of Science&TechnologyWuhan 430022China

Anti virulence strategy has been considered as one of the most promising approaches to combat drug-rcesistant bacterial ***-forming toxins(PFTs)are the largest class of bacterial toxins,inficting their virulence ffect through creating pores on the cell ***,curent solutions for eliminating PFTs are mostly designed based on their molecular structure,requiring customized design for different *** the present study,we employed erythroliposome(denoted as RM-PL),a biomimetic platform constructed by artificial lipid membranes and natural erythrocyle membranes,to necutralize different hemolytic PFTs regardless of their molecular *** tested with model PFTs,including a-hemolysin,listeriolysin O,and streptolysin O,RM-PL could completely inhibit toxin-induced hemolysis in a concentration-dependent *** vivo studies further confirmed that *** eficiently neuralize various toxins and save animals'lives without causing damage to 0rgans or *** addition,we explored the underlying mechanisms of this efficient detoxification ability and found that it was mainly macrophages in the spleen and the liver that took up RM-PL-absorbed toxins through a variety of endocytosis pathways and digested them in *** summary,the biomimetic RM-PL presented a promising system for broad-spectrum and powerful toxin neutralization with a mech-anism of lysosome-mediaed loxin degradation.

关键词： Eythroliposome Broad-spectrum detoxifcation Hybrid nanovesicle Pore-forming toxins Macrophage uptake Red blood cell membrane Atificial lipid membrane

Accurate Data Match and Call Method for the Thermal Compensation Database of the Reflector Antenna

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第5期22卷 98-108页

作者： yuefei Yan Song Xue Xinlan Hu Peiyuan lian Yan wang lin li Qian Xu Na wang Wulin Zhao Yuanpeng Zheng Congsi wang Key Laboratory of Electronic Equipment Structure Design Ministry of EducationXidian UniversityXi'an 710071China School of Information and Control Engineering Xi’an University of Architecture and TechnologyXi'an 710055China School of Physics and Technology Xinjiang UniversityUrumqi830046China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China The 3.th Research institute of china Electronics Technology Group Corporation Xi'an 710065China The 54.h Research institute of china Electronics Technology Group Corporation Shijiazhuang 050081China

The influence of thermal deformation on the performance of reflector antennas has become increasingly significant with the increasing aperture and working *** use of a thermal compensation database is an efficient method to compensate for the deformation caused by the non-uniform temperature ***,how to efficiently and accurately match and call the database remains as one of the tough challenges for the antenna thermal compensation system to achieve real time ***,this study proposes a data match and call method for the thermal compensation database of the reflector antenna,matching the database from three aspects:the overall rms match of temperature data,the similarity area match of each data sample,and the key area match of key structural *** validation of this method is demonstrated in an *** difference between the pointing adjustment amount calculated by the matched data and the collected data was found to be less than 1",which satisfied the requirements of practical engineering,thus achieving real-time thermal compensation of the antenna.

关键词： instrumentation miscellaneous-methods miscellaneous-telescopes

Nonmonotonic propositional logic

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2021年第3期15卷 215-216页

作者： Wei li yuefei SUI Yuhui wang State Key Laboratory of Software Development Environment Beihang UniversityBeijing 100191China Key Laboratory of Intelligent Information Processing Institute of Computing TechnologyChinese Academy of SciencesBeijing 100190China School of Computer and Control Engineering University of Chinese Academy of SciencesBeijing 100049China Information Technology Center China Reinsurance(Group)CorporationBeijing 100033China

Propositional logic[1]is basic,based on which other logics are *** deduction system for propositional logic is *** logics are a class of logics which deduction systems are *** ones are default logic[2,3.,R-calculus[4.... 详细信息

关键词： default propositional Nonmonotonic

The“Top 50 High Impact Researches of Traditional Medicine”published in 2021

在线全文

学校读者我要写书评

暂无评论

Acupuncture and Herbal Medicine 2023年第4期3卷 232-243页

作者： Xiao li Dong Xu Jianfeng Tu Bo Pang Xiaohui Yan Yuanlu Cui yuefei wang Cunzhi liu Yi wang Junhua Zhang Tianjin University of Traditional Chinese Medicine TianjinChina State Key Laboratory of Component-based Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjinChina Department of Pharmacy Xijing HospitalFourth Military Medical UniversityXi’anChina International Acupuncture and Moxibustion Innovation institute School of Acupuncture-Moxibustion and TuinaBeijing University of Chinese MedicineBeijingChina Pharmaceutical Informatics institute College of Pharmaceutical SciencesZhejiang UniversityHangzhouChina

In recent years,significant progress has been achieved in both basic and clinical research within the field of traditional medicine,garnering increasing attention *** further promote a high-quality and international development of traditional medicine,the editorial board of Acupuncture and Herbal Medicine provided a collection of the“Top 50 High-impact Researches of Traditional Medicine”published in 2021 through objective indicators and a strict selection *** findings of the selected articles have a significant academic influence and possess considerable academic value both nationally and *** selected articles cover a wide range of topics,including clinical research,acupuncture,pharmacology,chemistry,biosynthesis,medicinal plant resources,and new formulation and drug delivery system research on traditional ***,this article outlines the selection process of the top 50 high-impact research articles,analyzes their research characteristics,and provides a brief summary of their new findings and perspectives in the field of traditional medicine.

关键词： Academic influence Ethnopharmacology High-impact research Traditional medicine