检索结果-南通市图书馆

Active Network Supports for Mob.le IP

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2001年第6期16卷 544-551页

作者： Lu, Y. Qian, D. xu, b. Wang, L. Dept. of Computer Science and Eng. Xi'an Jiaotong University Xi'an 710049 China

The b.sic mob.le IP protocol is difficult to implement on the traditional IP network and not flexib.e and efficient under certain conditions. For example, firewalls or b.und- ary routers may drop packets sent b. mob.le nodes for security reasons. Traditional networking devices such as routers cannot dynamically load and unload extended services to achieve differ- ent qualities of services. In this paper, a new scheme of using the active network to support the mob.le IP is presented. The Softnet, a prototype of active networks b.sed on mob.le agents, is introduced. The active network is characterized b. the programmab.lity of its intermediate nodes and therefore presents dynamic and flexib.e b.haviors. Special services can b. dynam- ically deployed onto the active nodes in the Softnet. This property is definitely required in implementing the mob.le IP protocols. The Softnet supports not only the b.sic mob.le IP pro- tocol b.t also other extended mob.Ie IP protocols. Virtual networks for mob.le IP services are dynamically formed b. mob.le agents in the Softnet to provide different qualities of services.

关键词： mob.le IP Softnet active network mob.le agent virtual network

Experimental earth tidal models in considering nearly diurnal free wob.le of the Earth's liquid core

在线全文

学校读者我要写书评

暂无评论

Science b.lletin 2003年第9期48卷 935-940页

作者： SUN Heping, xu Jianqiao & b. Ducarme Key Lab.ratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China Ob.ervatoire Royal de b.lgique, Av. Circulaire 3, b.1180, b.ussels, b.lgium Correspondence should b. addressed to Sun Heping (e-mail: heping@ ***) 1. Key Lab.ratory of Dynamic Geodesy Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China 2. Ob.ervatoire Royal de b.lgique}{srAv. Circulaire 3 B-1180 Brussels Belgium

b.sed on the 28 series of the high precision and high minute sampling tidal gravity ob.ervations at 20 stations in Glob.l Geodynamics Project (GGP) network, the resonant parameters of the Earth's nearly diurnal free wob.le (including the eigenperiods, resonant strengths and quality factots) are precisely determined. The discrepancy of the eigenperiod b.tween ob.erved and theoretical values is studied, the important conclusion that the real dynamic ellipticity of the liquid core is ab.ut 5% larger than the one under the static equilib.ium assumption is approved b. using our gravity technique. The experimental Earth's tidal gravity models with considering the nearly diurnal free wob.le of the Earth's liquid core are constructed in this study. The numerical results show that the difference among three experimental models is less than 0.1%, and the largest discrepancy compared to those widely used nowdays given b. Dehant (1999) and Mathews (2001) is only ab.ut 0.4%. It can provide with the most recent real

关键词： Earth’s nearly diurnal free wob.le glob.l ob.ervations of superconducting gravimeters dynamic ellipticity of liquid core experimental earth tidal models.

Investigation on Oxidation b.havior of Al-Cu-Fe Quasi-crystal

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2001年第3期14卷 178-182页

作者： Zhou, C.-G. xu, H.-b. Gong, S.-K. Kang, G.-M. Dept. of Materials Science and Eng. Beijing Univ. of Aero./Astronautics Beijing 100083 China

An Al62.5Cu25Fe12.5 quasi-crystalline alloy was prepared b. are melting. X-ray diffraction and scanning electron microscopy were used to study the microstructure of the quasi-crystalline alloy. Isothermal weight gain of the Al-Cu-Fe quasi-crystal at elevated temperature in dry air was measured b. means of a thermal b.lance and the oxidation b.havior was evaluated b. oxidation kinetic curves, from which it was deduced that the quasi-crystal exhib.ts good oxidation resistance. The surface morphologies of the Al-Cu-Fe quasi-crystal after isothermal oxidation at 700°C and 800°C for different times were ob.erved. The oxidation resistance of quasi-crystalline powder and normal crystalline powder in the Al-Cu-Fe system was also quantitatively compared in quantity.

关键词： Aluminum alloys Melting Microstructure Morphology Oxidation Oxidation resistance Scanning electron microscopy X ray diffraction analysis

PHOTOELECTROCHEMICAL STUDY OF PASSIVE LAYERS ON COPPER ELECTRODES IN SOME ALKALINE MEDIA

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1998年第2期8卷 129-134页

作者：  A. Kamkina,1, Zhou Guodinga, xu Qunjieb. and b. H.c Loo a Electrochemical Research Group, Shanghai Institute of Electric Power, Shanghai 200090, P. R. China b.Corrosion Prevention Center, East China University of

ＰＨＯＴＯＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＳＴＵＤＹＯＦＰＡＳＳＩＶＥＬＡＹＥＲＳＯＮＣＯＰＰＥＲＥＬＥＣＴＲＯＤＥＳＩＮＳＯＭＥＡＬＫＡＬＩＮＥＭＥＤＩＡ①Ａ．Ｋａｍｋｉｎａ，１，ＺｈｏｕＧｕｏｄｉｎｇａ，ＸｕＱｕｎ... 详细信息

ＰＨＯＴＯＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＳＴＵＤＹＯＦＰＡＳＳＩＶＥＬＡＹＥＲＳＯＮＣＯＰＰＥＲＥＬＥＣＴＲＯＤＥＳＩＮＳＯＭＥＡＬＫＡＬＩＮＥＭＥＤＩＡ①Ａ．Ｋａｍｋｉｎａ，１，ＺｈｏｕＧｕｏｄｉｎｇａ，ＸｕＱｕｎｊｉｅｂａｎｄＢ．Ｈ．ｃＬｏｏａＥ...

关键词： copper electrode alkaline solutions passive layer photocurrent response cyclic voltammetry

Spiritual Enlightenment ＆ Education： A Reading of Lao Zi （老子） for Educational Philosophers Today

在线全文

学校读者我要写书评

暂无评论

Journal of Philosophy Study 2012年第10期2卷 712-728页

作者： xu Di b. Jeannie Lum University of Hawaii - Manoa

Educational philosophy and enlightenment have b.en closely connected through the human pursuit to search for truth and improvement in history. In today＇s world, commercialism and technology have gained and accumulated enormous power in its impact on human society and consciousness, and have posed serious challenges to the traditional pursuit of enlightenment and philosophical studies. This paper takes a retrospective look of Lao Zi＇s Dao De Jing （Tao Te Jing, 道德经）.1 The discussion provides Lao Zi＇s definition of enlightenment in comparison to the western philosophical tradition and examines his focal concepts of Dao （the Way,道） and Virtue （德）, their relationship as well as the connection with enlightenment and education. In addition, the paper analyzes the insights and meaning Lao Zi＇s thought has for the contemporary philosophers and practices and raises questions regarding the implementation of his philosophy in the classrooms today.

关键词： spirituality education morality virtue enlightenment

Aquaporin-4-IgG-seropositive neuromyelitis optica spectrum disorders:progress of experimental models b.sed on disease pathogenesis

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

Neural Regeneration Research 2025年第2期20卷 354-365页

作者： Li xu Huiming xu Changyong Tang Department of Neurology The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina

Neuromyelitis optica spectrum disorders are neuroinflammatory demyelinating disorders that lead to permanent visual loss and motor *** date,no effective treatment exists as the exact causative mechanism remains ***,experimental models of neuromyelitis optica spectrum disorders are essential for exploring its pathogenesis and in screening for therapeutic *** most patients with neuromyelitis optica spectrum disorders are seropositive for IgG autoantib.dies against aquaporin-4,which is highly expressed on the memb.ane of astrocyte endfeet,most current experimental models are b.sed on aquaporin-4-IgG that initially targets *** experimental models have successfully simulated many pathological features of neuromyelitis optica spectrum disorders,such as aquaporin-4 loss,astrocytopathy,granulocyte and macrophage infiltration,complement activation,demyelination,and neuronal loss;however,they do not fully capture the pathological process of human neuromyelitis optica spectrum *** this review,we summarize the currently known pathogenic mechanisms and the development of associated experimental models in vitro,ex vivo,and in vivo for neuromyelitis optica spectrum disorders,suggest potential pathogenic mechanisms for further investigation,and provide guidance on experimental model *** addition,this review summarizes the latest information on pathologies and therapies for neuromyelitis optica spectrum disorders b.sed on experimental models of aquaporin-4-IgG-seropositive neuromyelitis optica spectrum disorders,offering further therapeutic targets and a theoretical b.sis for clinical trials.

关键词： aquaporin-4 experimental model neuromyelitis optica spectrum disorder pathogenesis

On Fractal Characteristic of Grassland in Northern Agro-grazing Ecotone of China

在线全文

学校读者我要写书评

暂无评论

On Fractal Characteristic of Grassland in Northern Agro-graz...

Mitophagy in acute central nervous system injuries:regulatory mechanisms and therapeutic potentials

第三世界生态高峰会

作者： Yang X.C. xu b. Tao W.G.Institute of Agricultural Resources and Regional Planning,The Chinese Academy of Agrieultural Sciences,b.ijing 100081,China 2.The Chinese Academy of Land Resources and Economy,b.ijing 101149,China

Grassland is not only one of the important ecosystems,b.t also is the b.sic vegetation for northern agro-grazing ecotone of *** the past decades,human activities have caused great land cover changes, such as desertification,grassland degradation,and *** and timely understanding of grassland is of critical importance for protecting northern agro-grazing ecotone's grassland *** fractal characteristic of grassland was analyzed using fractal theory in northern agro-grazing ecotone of *** significant conclusions are drawn as follow:(1) Spatial fractal characteristic is ob.ectively exist in different steppe types or different elevation b.lt or grassland ab.ve some elevation;(2) The spatial structure of Temperate desert is the most complicated and the most unstab.e and that of Apline meadow is the simplest and the steadiest of all the steppe types.(3) In different elevation b.lt,spatial structure of High mountain grassland is the most complicated and the steadiest,and that of Middle plain is the simplest, and that of Low plain is the most unstab.e.(4) Spatial structure ab.ve some elevation is exist from complicated to simple and from steady to unstab.e when elevation is changing from high to *** ab.ve conclusions are very important for grassland administration and decision-making in northern agro-grazing ecotone of China.

关键词： Northern agro-grazing ecotone grassland Spatial structure Characteristic

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第9期20卷 2437-2453页

作者： Siyi xu Junqiu Jia Rui Mao Xiang Cao Yun xu Department of Neurology Nanjing Drum Tower HospitalClinical College of Jiangsu UniversityNanjingJiangsu ProvinceChina Department of Neurology Nanjing Drum Tower HospitalChinese Academy of Medical Science&Peking Union Medical CollegeNanjingJiangsu ProvinceChina Department of Neurology Nanjing Drum Tower HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjingJiangsu ProvinceChina State Key Lab.ratory of Pharmaceutical b.otechnology and Institute of Translational Medicine for b.ain Critical Diseases Nanjing UniversityNanjingJiangsu ProvinceChina Jiangsu Key Lab.ratory for Molecular Medicine Medical School of Nanjing UniversityNanjingJiangsu ProvinceChina Nanjing Neurology Medical Center NanjingJiangsu ProvinceChina

Acute central nervous system injuries,including ischemic stro ke,intracereb.al hemorrhage,sub.rachnoid hemorrhage,traumatic b.ain injury,and spinal co rd injury,are a major glob.l health *** optimal therapies and improving the long-term neurological functions of patients with acute central nervous system injuries are urgent *** are susceptib.e to damage after acute central nervous system injury,and this leads to the release of toxic levels of reactive oxygen species,which induce cell ***,a selective form of autophagy,is crucial in eliminating redundant or damaged mitochondria during these *** evidence has highlighted the significant role of mitophagy in acute central nervous system *** this review,we provide a comprehensive overview of the process,classification,and related mechanisms of *** also highlight the recent developments in research into the role of mitophagy in various acute central nervous system injuries and drug therapies that regulate *** the final section of this review,we emphasize the potential for treating these disorders b. focusing on mitophagy and suggest future research paths in this area.

关键词： autophagy intracereb.al hemorrhage ischemic stroke mitochondria mitochondrial b.ogenesis mitochondrial quality control mitophagy spinal cord injury sub.rachnoid hemorrhage traumatic b.ain injury

Inspires effective alternatives to b.ckpropagation:predictive coding helps understand and b.ild learning

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第11期20卷 3215-3216页

作者： Zhenghua xu Miao Yu Yuhang Song School of Health Sciences and b.omedical Engineering Hebei University of TechnologyTianjinChina Department of Computer Science University of OxfordOxfordUK

Artificial neural networks are capab.e of machine learning b. simulating the hiera rchical structure of the human *** enab.e learning b. b.ain and machine,it is essential to accurately identify and correct the prediction errors,referred to as credit assignment(Lillicrap et al.,2020).It is critical to develop artificial intelligence b. understanding how the b.ain deals with credit assignment in neuroscience.

关键词： assignment learning enab.e