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Relationship between the characteristics of landforms and sediments as well as the plume front in the hangzhou Bay

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Acta Oceanologica Sinica 1993年第1期12卷 133-144页

作者： Feng Yingjun Li Yan and Li Bogen Second Institute of Oceanography, State Oceanic Administration, hangzhou 310012, China

Sedimentary environments in the hangzhou Bay are introduced by a three-subregional landform pattern and a sedimentation map with six major sedimentation types. The geographic setting, sediment transportation and sedimentation in different subregions are discussed with sediment grain parameters. Sedimentary basin suffering from effect of plume front can be identified by the fine sediments with median ( Mdφ ) 7φ-8φ, clay content 30% - 40% and silt 60% - 70%. Sediment transportation along the plume front seems not to be a direct effect on sedimentary formation of the shoals fringing the south coast of the hangzhou Bay.

关键词： Relationship between the characteristics of landforms and sediments as well as the plume front in the hangzhou Bay well

Strong near-epoch dependence

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Science China Mathematics 2004年第4期47卷 497-507页

作者： LIN ZhengyanDepartment of Mathematics, Zhejiang University, hangzhou 310028, China Department of Mathematics Zhejiang University Hangzhou China

We introduce a new class of dependent sequences of random variables, which is a subclass of near-epoch dependent sequences, but can also be approximated by mixing sequences. For this kind of sequences of random variables, we call them strong nearepoch dependent sequences, a p-order, p ＞ 2, (maximum) moment inequality is established under weaker dependence sizes.

关键词： near-epoch dependence, mixingale, strong near-epoch dependence, moment inequality, convergence.

Residual currents in plume front zone of the hangzhou Bay

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Acta Oceanologica Sinica 1993年第1期12卷 29-37页

作者： Chen Wei Huang Daji and Yang Zhaoqing Second Institute of Oceanogrphy, State Oceanic Administration, hangzhou 310012 , China Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 China China

It is of some limitations to analyse residual currents by means of the 25 h anchored current measurements. On the basis of the drift tracking and the mooring system data, here, analyses have been done aiming at the structural characteristics and the dynamical mechanisms of the frontal residual current field of the hangzhou Bay. Especially a theoritical model is given focusing on the frontal density-driven currents. The results indicate that there exists obviously the upper-layer front-driven flow along the orientation of the front during neap tides in the research area of the hangzhou Bay. But the flow is restrained by the strong vortical viscosity during spring tides. In the lower layer, the effect of the front is little and the subtidal movements are dominated by the tide-induced residual currents. In addition, the influences of wind forcing to the residual current field are also suggested to be important.

关键词： Residual currents in plume front zone of the hangzhou Bay

NECESSARY AND SUFFICIENT CONDITION OF THE STRONG CONVERGENCE FOR TWO FINITE FAMILIES OF UNIFORMLY L-LIPSCHITZIAN MAPPINGS

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Acta Mathematica Scientia 2011年第5期31卷 2058-2066页

作者：谷峰 Institute of Applied Mathematics and Department of Mathematics hangzhou Teacher's College

The purpose of this paper is to study necessary and su？cient condition for the strong convergence of a new parallel iterative algorithm with errors for two finite families of uniformly L-Lipschitzian mappings in Bana... 详细信息

关键词： asymptotically pseudo-contractive mapping uniformly L-Lipschitzian map- ping parallel iterative algorithm

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湿陷性黄土地基大跨度桩基承载特性模型试验

西北大学学报（自然科学版） 2024年第1期54卷 93-100页

作者：刘小华廖红建李明泽刘少华李杭州广州地铁设计研究院股份有限公司广东广州510010 西安交通大学城市学院土木建筑工程学院陕西西安710018 西安交通大学人居环境与建筑工程学院陕西西安710049

城市车辆段上盖开发工程中的大跨度桩基具有单桩竖向承载较大、桩间大跨度范围内土体受荷较小的特点。以西安地铁某车辆段大跨度桩基为研究对象,制备人工湿陷性黄土作为相似材料,开展了湿陷性黄土地层大跨度桩基的室内模型试验,研究大... 详细信息

城市车辆段上盖开发工程中的大跨度桩基具有单桩竖向承载较大、桩间大跨度范围内土体受荷较小的特点。以西安地铁某车辆段大跨度桩基为研究对象,制备人工湿陷性黄土作为相似材料,开展了湿陷性黄土地层大跨度桩基的室内模型试验,研究大跨度桩基在湿陷性黄土地层中的荷载传递机制与变形规律。结果表明:制备的人工湿陷性黄土与现场原状黄土性质接近,将其应用于模型试验时可以得到良好的效果;大跨度桩基在未浸水时,荷载沉降曲线为陡降型,桩身轴力在桩顶附近显著下降,未达到极限承载力时,桩顶沉降、桩端阻力线性增大;在黄土浸水湿陷后,桩身轴力沿埋深方向呈“D”字型分布,随着浸水时间的增加,桩顶沉降、桩端阻力先缓慢增加后显著增加,中性点位置不断向桩身下部移动。

关键词：湿陷性黄土桩基模型试验负摩阻力

Lipschitz continuity of best approximations and Chebyshev centers

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Chinese Science Bulletin 1998年第3期43卷 185-188页

作者： LI Chong 1 and WANG Xinghua 2 1. Center for Mathematical Sciences, Zhejiang University, hangzhou 310027, China 2. Department of Mathematics, hangzhou University, hangzhou 310028, China Center for Mathematical Sciences Zhejiang University Hangzhou China Department of Mathematics Hangzhou University Hangzhou China

The Lipschitz continuity results are given for best approximations and Chebyshev centers. Consequently, the open problem presented by Septycki and Vleck is solved completely.

关键词： best approximation Chebyshev center uniform convexity.

Samarium Diiodide-Mediated Reductive Cleavage of Se-Se Bond of Diacyl Diselenides:A New Method for Synthesis of β-Selenoesters

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Chinese Chemical Letters 1998年第5期9卷 417-420页

作者： Yong Min ZHANG Wen Ying HAO You HUANG Jia Jun ZHU(Department of Chemistry, hangzhou University, hangzhou 310028) Department of Chemistry Hangzhou University Hangzhou 310028 China

The reduction of diacyl diselenides by samarium diiodide led to the production ofsamarium acylselenolates, which reacted with a,β-unsaturated esters or nitriles to give β-selenoesters or selenonitriles under mild an... 详细信息

关键词： reductive cleavage samarium diiodide diacyl diselenide,β-selenoester

Lateral Mode of Three-dimension Resonator

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光电子.激光 1989年第2期 77-80页

作者： Lin Qiang Department of physics, hangzhou University, hangzhou, 310028, China.

Three-dimension optical resonators are treated by matrix ***, We introduce a way practical in analysing three-dimention resonators. Then, as a illustration, we analysed a resonator bounded by two arbitary orintated c... 详细信息

关键词： resonator mirrors analysed illustration cylindrical quasi symmetrical focusing tensor matrices

ON MULTIPLE POSITIVE SOLUTIONS FOR A NONLINEAR ELLIPTIC PROBLEM IN R^N

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Chinese Annals of Mathematics,Series B 2000年第3期21卷 351-358页

作者： YANG HAITAO(Department of Mathematics, Zhejiang University, hangzhou 310027, China.) WU SHAOPING(Department of Mathematics, Zhejiang University, hangzhou 310027, China.) Department of Mathematics Zhejiang University Hangzhou 310027 China

By making use of Variational method, the authors obtain some results about existence of multiple positive solutions and their asymptotic behavior as the parameter →＋∞ for a semilinear elliptic problem in RN.

关键词： Critical point Asymptotic behavior Concentration