检索结果-南通市图书馆

Gelfand-Kirillov Dimension and Reducibility of Scalar Generalized Verma Modules for Classical Lie Algebras

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,english Series 2024年第3期40卷 658-706页

作者： Zhan Qiang BAI Jing JIANG School of Mathematical Sciences Soochow UniversitySuzhou 215006P.R.China E-mail:zqbai@*** jjsd6514@***

Let g be a classical complex simple Lie algebra and q be a parabolic *** M be a generalized Verma module induced from a one dimensional representation of *** M is called a scalar generalized Verma *** this paper,we will determine the reducibility of scalar generalized Verma modules associated to maximal parabolic subalgebras by computing explicitly the Gelfand-Kirillov dimension of the corresponding highest weight modules.

关键词： Generalized Verma module Gelfand-Kirillov dimension Young tableau

NUMeRICAL SIMULATION FOR SOLITARY WAVeS OF RLW eQUATION

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2004年第2期16卷 130-135页

作者： XUZhen-li LIURu-xun DepartmentofMathematics UniversityofScienceandTechnologyofChinaHefei230026Chinae-mail.xuzl@ustcedu

A high order finite difference scheme for solving the Regularised Long Wave(RLW) equation, based on the high order Pade approximation and Lax-Wendroff type timediscretization, was developed in this paper. Some numerical examples, including the propagation of asingle soliton, the interaction of double solitary waves and the temporal evolution of a Maxwellianinitial pulse, were studied to test the accuracy, efficiency and conservation property of thescheme. Compared with the results based on finite element methods, the scheme is proven successful.

关键词： RLW equation pade approximation soli-ton lax-wendroff scheme

*** as a model system for Parkinson disease

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2006年第2期22卷 124-128页

作者： Pu PU,Wei-Dong Le State Key Laboratory of Medical Genomics,Ruijin Hospital,Shanghai Jiao Tong University School of Medicine Institute of Health Sciences,Shanghai Institutes for Biological Sciences,Chinese Academy of Sciences-Shanghai Jiao Tong University School of Medicine,Shanghai 200031,China State Key Laboratory of Medical Genomics Ruijin Hospital Shanghai Jiao Tong University School of Medicine Institute of Health Sciences Shanghai Institutes for Biological Sciences Chinese Academy of Sciences- Shanghai Jiao Tong University School of Medicine Shanghai 200031China e-mail: weidong@bcm.tmc.edu celegans@***.

Parkinson disease(PD) is characterized by the selective loss of dopaminergic neurons in the substantia nigra. Although investigation in mammalian animal models of PD has enhanced our understanding of PD, the complexity of the mammalian nervous system and our inability to visualize DA neurons in vivo restricts the advances in elucidating the molecular mechanisms of PD. Conservation between C. elegans and mammals in genomic, biosynthetic and metabolic pathways as well as the advantages of observing DA neurons morphology in vivo and the ease of transgenic and genetic manipulation make C. elegans an excellent model organism for PD.

关键词： caenorhabditis elegans( C. elegans) Parkinson disease dopaminergic neuron

Hydrophobic long-chain two-dimensional perovskite scintillators for underwater X-ray imaging

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第1期43卷 175-185页

作者： Jin-Xiao Zheng Zi-An Zhou Tiao Feng Hui Li Cheng-Hua Sun NüWang Yang Tian Yong Zhao Shu-Yun Zhou Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Laboratory of Bioinspired Smart Interfacial Science and Technology of the Ministry of education Beijing Key Laboratory of Bioinspired Energy Materials and DevicesSchool of ChemistryBeijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China Department of engineering Physics Tsinghua University and Key Laboratory of Particle and Radiation Imaging Ministry of EducationTsinghua UniversityBeijing 100084China e-mail:yangt@***

The underwater X-ray imaging technology development is significant to subaqueous target reconnaissance/detection/identification, subfluvial archaeology,submerged resource exploration, etc. As the core of X-ray imaging detection, the scintillator has been plagued by inherent moisture absorption and decomposition, and strict requirements for seamless packaging and ***, we designed a manganese-doped two-dimensional(2D) perovskite scintillator modified by hydrophobic longchain organic amine through the combination of component and doping engineering. The modified perovskites show high water repellency that can be used as an underwater X-ray scintillator. X-ray images of aquatic organisms or other objects with a high spatial resolution of10 lp·mm^(-1) at a big view field(32 mm × 32 mm) were obtained by scintillation screen. This hydrophobic perovskite scintillator based on molecular design is of great promise in underwater X-ray nondestructive testing technology development.

关键词： Two-dimensional perovskite Hydrophobic Scintillators Underwater X-ray imaging Underwater nondestructive testing technology

A genetic algorithm based stochastic programming model for air quality management

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2002年第3期14卷 367-374页

作者： MaXM ZhangF CenterforenvironmentalSciences PekingUniversityBeijing100871China.E－mail：zhangfan@*** CenterforenvironmentalSciences PekingUniversityBeijing100871China.E－mail：zhangfan@water.pku.edu.c

This paper presents a model that can aid planners in defining the total allowable pollutant discharge in the planning region, accounting for the dynamic and stochastic character of meteorological conditions. This is accomplished by integrating Monte Carlo simulation and using genetic algorithm to solve the model. The model is demonstrated by using a realistic air urban scale SO 2 control problem in the Yuxi City of China. To evaluate effectiveness of the model, results of the approach are shown to compare with those of the linear deterministic procedures. This paper also provides a valuable insight into how air quality targets should be made when the air pollutant will not threat the residents' health. Finally, a discussion of the areas for further research are briefly delineated.

关键词： stochastic model genetic algorithms air quality management optimization

在线全文

学校读者我要写书评

暂无评论

基于主从力反馈的同构主手设计与研究

机械设计与研究 2024年第1期40卷 63-68页

作者：陈铮王晨麟夏华磊刘振武张伟军上海交通大学机械与动力工程学院上海200240E-mail:zhangweijun@*** 国网徐州供电公司江苏徐州221000

在变电站场景中,巡检机器人已经逐步取代人工巡检作业。但现有机器人存在遥操作效率低、无法很好地实现拟人化操作等问题,难以完成变电站巡检作业中急停、拉闸等接触性操作任务,亟需研发对变电站巡检具有高适应性的协同作业机器人。针... 详细信息

在变电站场景中,巡检机器人已经逐步取代人工巡检作业。但现有机器人存在遥操作效率低、无法很好地实现拟人化操作等问题,难以完成变电站巡检作业中急停、拉闸等接触性操作任务,亟需研发对变电站巡检具有高适应性的协同作业机器人。针对变电站巡检处置应用需求,开展了基于主从力反馈的巡检机器人遥操作技术研究,设计了一款串联型同构主手,结构上主从映射关系直接,控制上力反馈双向控制完整,实现了六自由度机械臂主从力反馈,便于进行精细化操作。开展主从力反馈技术研究,通过构建和简化动力学模型实现负载、摩擦力补偿,采用力直接反馈型双向控制策略。完成样机研制并进行了功能验证和精度测试实验,结果表明主手能够较好地完成巡检操作基本任务,力反馈误差小于7%,机械臂末端跟踪精度优于2 mm,验证了机械结构及控制系统的有效性。

关键词：巡检机器人同构主手主从控制力反馈

effect of leachate recycling and inoculation on the biochemical characteristics of municipal refuse in landfill bioreactors

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2002年第3期14卷 406-412页

作者： ShenDS HeR DepartmentofenvironmentandResource ZhejiangUniversityHangzhou310029China.E－mail：shends@*** DepartmentofenvironmentandResource ZhejiangUniversityHangzhou310029China.E－mail：shends@mail.hz.zj

Activity development of key groups of enzymes involved in municipal refuse decomposition was measured in laboratory landfill bioreactors with and without leachate recycling and inoculation for about 210 days. The results showed that the enzymes (amylase, protease, cellulase, lipase and pectinase) were present in fresh refuse but at low values and positively affected by leachate recycling and refuse inoculation. The total average of cellulase activity in digesters D3 operated with leachate recycling but no inoculation, D4 and D5 operated with leachate recycling and inoculation was much higher than that in digesters D1 and D2 without leachate recycling and inoculation by 88%—127%, 117%—162% and 64%—98%. The total average of protease activity was higher in digester D4 than that in digesters D1, D2, D3 and D5 by 63%, 39%, 24% and 24%, respectively, and the positive effect of leachate recycling and inoculation on protease activity of landfilled refuse mainly was at the first two months. The total average of amylase activity was higher in digesters D3, D4 and D5 than that in digesters D1 and D2 by 83%—132%, 96%—148% and 81%—129%. During the early phase of incubation, the stimulatory effect of inoculation on lipase activity was measured, but refuse moisture was the main factor affecting lipase activity of landfilled refuse. The inoculation, initial and continuous inoculation of microorganisms existing in leachate, was the mainly stimulatory factor affecting pectinase activity of landfilled refuse.

关键词： municipal refuse landfill bioreactor leachate recycle inoculation enzyme activity biochemical characteristics

Dynamically lithium-compensated polymer artificial SeI to assist highly stable lithium-rich manganese-based anode-free lithium metal batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第6期43卷 2527-2535页

作者： Ming-Ji Peng Jin-Qiu Zhou Ting-Ting Han Yang Zhou Jie Liu Na Xu Zhen-Kang Wang Wen-Bin Lin Cheng-Lin Yan Key Laboratory of Core Technology of High Specific energy Battery and Key Materials for Petroleum and Chemical Industry College of EnergySoochow UniversitySuzhou 215006China Light Industry Instituteof electrochemical Power Sources Suzhou 215006China School of Chemistry and Chemical engineering Nantong UniversityNantong 226019China e-mail:jliu93@*** State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China Centre energie Materiaux et TélécommunicationsInstitut National de la Recherche ScientifiqueVarennesQC J3X 1S2Canada Zhangjiagang Industrial Technologies Soochow UniversitySuzhou 215006China

Owing to the unique structure,anode-free lithium metal batteries(AFLMBs)have higher energy density and lower production cost than traditional lithium metal batteries(LMBs)or lithium-ion batteries(LIBs),However,AFLMBs suffer from an inherently finite Li reservoir and exhibit poor cycle stability,low Coulombic efficiency(Ce)and severe dendrite *** this work,polydiallyl lithium disulfide(PDS-Li)was successfully synthesized and coated on Cu current collector by electrochemical *** PDS-Li acts as an additional lithium resource to compensate for the irreversible loss of lithium during *** addition,the special structure and lithiophilicity of PDS-Li contribute to lower nucleation overpotential and uniform lithium *** coupled with Li-rich manganese-based(LRM)cathode of Li1.2Mn0.54Ni0.13Co0.13O2,the anode-free full cell exhibits significantly improved cycle stability over 100 cycles and capacity retention of 63.3%and 57%after 80 and 100 cycles,*** believe that PDS-Li can be used to ensure stable cycling performance and high-energy-density in AFLMBs.

关键词： Anode-free Artificial solid electrolyte interphase(SeI) Lithium metal batteries Lithium-rich cathode Finite element simulation

Removal of organic contaminants from water or wastewater with liquefied gases

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2002年第1期14卷 1-6页

作者： YangC TeoKC DivisionofChemistry NationalInstituteofEducationNanyangTechnologicalUniversity1NanyangWalkSingapore637616.e－mail：kcteo@nie.edu.sg chyang7071@*** DivisionofChemistry NationalInstituteofEduca

This study utilized liquefied gases (LG) as extractant to remove various organic contaminants including halogenated hydrocarbons and phenols as well as aromatic compounds from aqueous matrices. Orthogonal experiments were performed to optimize the operating conditions such as temperature, co solvents and so on. Under favorable conditions, high removal efficiencies can be readily achieved for a great number of representative model organic contaminants, the removal efficiencies for most of the hydrophobic contaminants were greater than 90% in a single extraction stage. Tentative effort was also done for the removal of extracted contaminants from recycled liquefied gases.

关键词： liquefied gases butane extraction organic contaminants water