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L~∞ CONVERGENCE OF TRUNC ELEMENT FOR THE BIHARMONIC EQUATION

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Journal of Computational mathematics 1997年第1期15卷 14-22页

作者： M. Wang(department of mathematics, Beijing university, Beijing, china) 北京大学数学系北京

The paper considers the L∞ convergence for TRUNC finite elements solving the boundary value problems of the biharmonic equation. The nearly optimal L∞ estimates for the error of first order derivatives are *** TRUNC plate element is proposed and developed by Argyris et al.. The numerical experiences show that the element has very good .***,[1l2]. The mathematicalproof of convergence of the TRUNC element is given by Shi Zong-ci in paper [3]. Thispaper will consider the L~∞ convergence for the TRUNC plate element.

关键词： Biharmonic equations Convergent boundaries Shape functions Vertices Interpolation Weighting functions Integers

THE BLOCH CONSTANT OF LOCALLY BIHOLOMORPHIC MAPPINGS ON BOUNDED SYMMETRIC DOMAINS

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Chinese Annals of mathematics,Series B 1996年第3期17卷 271-278页

作者： GONG SHENG(department of mathematics, university of Science and Technology of china, Hefei 230026, china) 中国科学技术大学数学系安徽合肥

The estimations of the bounds of the Bloch constant of locally biholomorphic mappingson irreducible bounded symmetric domains are given. When the domain is a unit circle, theestimation of the lower bounds is just the ... 详细信息

关键词： Bounded symmetric domain Bloch mapping Bloch constant,Locally biholomorphic mapping

Origin and shallow-layer structure of the sediments in the Yellow Sea trough

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Acta oceanologica Sinica 1991年第1期10卷 107-115页

作者： Zhao Songling and Li Guogang Institute of oceanology, Academica Sinica, qingdao, 266071, chinaInternational department of china ocean Press, 1, Fuxingmenwei Street, Beijing, 100860, china Inst of oceanology Academica Sinica Qingdao 266071 China China

On the basis of the analysis and study of the records of shallow-layer profiles and information from systematic analyses of some cores and their 14C datings, the sediments of Yellow Sea trough since the final slage the Late Pleistocene are found to have the following features. On the south slope of the trough, it is probably composed of island-shelf de posits. On the mouth of the trough, it is made up of eolian dunes and its deposits. In the centra! bottom region of the trough where intense desertization occurred in the early stage of the regression, there are parallel oblique beddings in the strata known as the 'angle of repose' texture, which demonstrates that the deposits there are composed of eolian sands. And in the late stage, thin derivative deposits developed in the northern part of the trough. On the north slope of the trough, thick-layer derivative deposits developed. This primary sedimentary pattern still remains unchanged since the occurrence of the Holocene transgression.

关键词： Origin and shallow-layer structure of the sediments in the Yellow Sea trough

Protochordate amphioxus is an emerging model organism for comparative immunology

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Progress in Natural Science:Materials International 2009年第8期19卷 923-929页

作者： Shicui Zhang a, Yujun Liang a, Guangdong Ji a, Zhimeng Zhuang b a department of Marine Biology, ocean university of china, qingdao 266003, china b Yellow Sea Fishery Research Institute, Chinese Academy of Fishery Science, qingdao 266071, china department of Marine Biology Ocean University of China Qingdao 266003 China Yellow Sea Fishery Research Institute Chinese Academy of Fishery Science Qingdao 266071 China

Protochordate amphioxus is an extant invertebrate regarded quite recently as a basal chordate. It has a vertebrate-like body plan including a circulation system with an organization similar to that of vertebrates. However, amphioxus is less complex than vertebrates for having a genome uncomplicated by extensive genomic duplication, and lacking lymphoid organs and free circulating blood cells. Recent studies on immunity have demonstrated the presence in amphioxus of both the constituent elements of key molecules involved in adaptive immunity such as proto-major histocompatibility complex (proto-MHC), V region-containing chitin-binding protein (VCBP) and V and C domain-bearing protein (VCP), and the complement system operating via the alternative and lectin pathways resembling those seen in vertebrates. In addition, the acute phase response profile in amphioxus has been shown to be similar to that observed in vertebrates. These findings together with the relative structural and genomic simplicity make amphioxus an ideal organism for gaining insights into the origin and evolution of the vertebrate immune system, especially adaptive immunity, and the composition and mech- anisms of the vertebrate innate immunity.

关键词： Amphioxus Branchiostoma Immunity Evolution

On Holomorphic Automorphisms of a Class of Non-homogeneous Rigid Hypersurfaces in C^(N+1)

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Chinese Annals of mathematics,Series B 2010年第2期31卷 201-210页

作者： Qingyan WU department of mathematics,Linyi Normal university,Linyi 276005,Shandong,china department of mathematics,Zhejiang university,Hangzhou 310027,china department of mathematics Linyi Normal University Linyi 276005 Shandong China department of mathematics Zhejiang University Hangzhou 310027 China

The author determines the real-analytic infinitesimal CR automorphisms of a class of non-homogeneous rigid hypersurfaces in CN+1 near the origin,and the connected component containing the identity transformation of al... 详细信息

关键词： Real-analytic infinitesimal CR automorphisms Rigid hypersurfaces Holomorphic automorphisms

ON THE VARIATIONS OF G_2

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Chinese Annals of mathematics,Series B 2003年第3期24卷 387-394页

作者： LIU DONG LIN LEI department of mathematics, East china Normal university, Shanghai 200062, china. department of mathematics, East china Normal university, Shanghai 200062, china. department of mathematics East China Normal University Shanghai 200062 China

In [1], Shen Guangyu constructed several classes of new simple Lie algebras of characteristic 2, which are called the variations of G2. In this paper, the authors investigate their derivation algebras. It is shown that G2 and its variations all possess unique nondegenerate associative forms. The authors also find some nonsingular derivations of ViG for i = 3,4, 5, 6, and thereby construct some left-symmetric structures on Vi G for i = 3,4,5,6. Some errors about the variations of sl(3, F) in [1] are corrected.

关键词： Variation Derivation Associative form Left-symmetric structure

MIXED FINITE ELEMENT METHODS FOR A STRONGLYNONLINEAR PARABOLIC PROBLEM

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Journal of Computational mathematics 1999年第2期17卷 209-220页

作者： Yan-ping Chen(department of mathematics, Nanjing university, Naming 210008, china Institute ofComputational and Applied mathematics, Xiangtan university, Hunan 411105, china) 南京大学数学系江苏南京

A mixed finite element method is developed to approximate the solution of a strongly nonlinear second-order parabolic problem. The existence and uniqueness of the approximation are demonstrated and L-2-error estimates... 详细信息

关键词： finite element method nonlinear parabolic problem

“有效降低全社会物流成本”研讨会专家观点综述

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中国流通经济 2024年第5期38卷 3-17页

作者：本刊编辑部《中国流通经济》编辑部

2024年2月24日,习近平总书记主持召开中央财经委员会第四次会议,指出物流是实体经济的“筋络”,强调必须有效降低全社会物流成本,增强产业核心竞争力,提高经济运行效率。基于此,2024年4月24日,北京物资学院党委宣传部、杂志社、科研处... 详细信息

2024年2月24日,习近平总书记主持召开中央财经委员会第四次会议,指出物流是实体经济的“筋络”,强调必须有效降低全社会物流成本,增强产业核心竞争力,提高经济运行效率。基于此,2024年4月24日,北京物资学院党委宣传部、杂志社、科研处联合主办了“有效降低全社会物流成本”研讨会。本次研讨会邀请我国流通物流领域的专家学者,围绕物流服务实体经济和人民群众、物流成本构成、交通运输体系改革、统一高效物流市场构建和现代商贸流通体系完善等问题,发表观点,为探索有效降低全社会物流成本可行路径,构建现代流通体系提供理论支持和实践指导。本刊编辑部对专家阐述的主要观点进行了归纳整理,以飨读者。

关键词：全社会社会物流成本新质生产力流通体系降本增效

Compressing Dynamic Range of Wind Lidar Signals by Gate-control

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Chinese Journal of Lasers 2001年第6期10卷 40-46页

作者： WU Songhua LIU Zhishen LIU Jintao HE Yan SONG Xiaoquan (ocean Remote Sensing Laboratory of Ministry of Education of china, ocean university of qingdao, qingdao 266003, china) 青岛海洋大学海洋遥感所教育部海洋遥感重点实验室山东青岛 266003

Laser backscattering signals in the atmosphere have a dynamic range of 10 5 or 10 6, with the intensity varying from near-field to far-field, such as one to ten kilometers. The attenuation varies with the distance as exponential and inverse square law. Therefore, it is necessary to improve the dynamic range with a gate-control to compress laser backscattering signals. This paper presents a description of gate-control applications in a wind lidar which can compress the dynamic range of laser backscattering signals from the near field atmosphere. In addition, a photomultiplier with gate-controlling can improve the detection distance and signal-to-noise. The study on Gate-controlled photomultiplier EMI 9214 has been carried out.

关键词： photomultiplier (PMT) dynode gate-control (gating)