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Search Results: 1 - 10 of 409190 matches for " br>陈凤欣 "
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An Expanded Characteristics-Mixed Finite Element Method for Quasilinear Convection-Dominated Diffusion Equations

CHEN Fengxin,CHEN Huanzhen,<br>
系统科学与数学 , 2009,
Abstract: An expanded characteristics-mixed finite element method for quasilinear convection-dominated diffusion equations is considered, here the characteristic approximation is to handle the convection part in time and the expanded mixed finite element spatial approximation is to deal with the diffusion part. The scheme is stable since fluid is transported along the approximate characteristics on the discrete level. The method expands the standard mixed finite element method in the sense that three variables are optimally and simulataneously treated: the scalar unknown, its gradient and flux. Theoretical analysis and numerical simulation that this method is stable and its $L^{2}$-error estimate is optimal.
Bacteria ecology in planting-culturing system

HUANG Fenglian,XIA Beicheng,DAI Xin,CHEN Guizhu,<br>黄,夏北成,,桂珠
应用生态学报 , 2004,
Abstract: Planting-culturing system in inter-tidal zone is a new type eco-culturing model. The survey on bacteria biomass and water quality in the designed planting-culturing system in inter-tidal zone showed that the mangrove planted in the system improved water quality and made water quality to II-III type, better than the IV and V type in the control pond. Designed ponds made heterotrophic bacteria, vibrio, phosphorus bacteria and enzyme-producing bacteria populations 1-2 order lower than the control pond without mongrove planting. Correlation analyses with CORREL software showed that the biomass of these bacteria was positively related with the nitrogen and phosphorus contents in water of the system, and the correlation coefficient for heterogeneous bacteria and vibrio was up to 0.9205. Heterotrophic bacteria and vibrio could be used as the water-quality monitoring organisms.
Effects of sloping land use patterns on phosphorus loss in a micro-watershed of red soil area,Southern China

CHEN Xin,<br>
生态学报 , 2000,
Abstract: The study was conducted in a Paixichong micro watershed ecosystem of Deqing County,Zhejiang Province.The results obtained showed as follows:(1)Phosphorus loss varied obviously in different land use patterns.The order of phosphorus loss was bamboo field>upland field>newly exploited orchard>early tea plantation>China fir forest>waste grassland.(2)Particulate phosphorus(PP)was the major form of phosphorus loss with the run off.The average of PP in total phosphorus (TP)was 78 07% but varied with land use patterns.Dissolved phosphorus(DP)in total phosphorus(TP)in waste grassland,forested land and early tea plantation were 35.29%,31.49% and 27.65%,respectively,which were higher than other land use patterns.(3)The phosphorus loss seriously occurred in bamboo field,upland field and newly exploited orchard was attributed to the consistency of agricultural activities during the rainy season.
The Architecture of Federated Searching Engine and the Implementation of Search Agent in .NET Framework

Chen Xin,<br>
现代图书情报技术 , 2004,
Abstract: Frequently a user's information needs are stored in the databases of multiple search platforms. It is inconvenient and inefficient for an ordinary user to invoke multiple databases and identify useful documents from the returned result. To support unified access to multiple databases, a federated searching engine can be constructed. This article presents a model of federated searching software component architecture, and introduces the implementation of search agent module in. Net framework.
中国中药杂志 , 2007,
Abstract: 健脾益肾软胶囊是在中药部颁标准收载的健脾益肾冲剂[1]基础上进行的二次开发,该制剂由补骨脂、党参、枸杞、女贞子、白术及菟丝子组成,具有健脾益肾的功效,用于减轻肿瘤病人术后放、化疗副反应,提高机体免疫功能以及脾肾虚弱所引起的疾病。健脾益肾冲剂质量标准中只进行了简单的理化鉴别,专属性差,不能很好地控制其质量。为了更有效的控制健脾益肾软胶囊的质量,作者采用高效液相色谱法测定方中君药补骨脂中补骨脂素和异补骨脂
Study on the Institutional Guarantee of Freelance Tour Guide

Service Science and Management (SSEM) , 2016, DOI: 10.12677/SSEM.2016.55016
Currently, the trend of tourists that are personalized and individual is obvious, and the reform of innovative freelance tour guide not only conforms to the needs of the market, but also helps ease relations which have been strained between tourists and guides. However, freelance tour guide’s practice is not entirely free, with the ensuing problems such as the protection of legitimate rights and interests of tourists, building the regulatory public service platform for guides, other legal aspects of the reform of freelance tour guide and control of guide market’s order are a series of regulatory issues to be solved.
The Cooperative Cache Techniques Used in PARFSNOW++

计算机科学 , 2000,
心里发展与教育 , 2002,
Abstract: 让76名4岁儿童(男25,女51)在实验室中面对陌生的实验员和另三名儿童讲述自己过生日经历,考察其自传式回忆及表述特征.结果发现:4岁儿童初步能进行自传式回忆,他们平均说出的事件为17个,平均说出的字数为25个.气质类型与自传式回忆的成绩基本无关.母亲养育方式与儿童自传式回忆的成绩之间的关系明显强于父亲.
心里发展与教育 , 2004,
Abstract: 本研究目的是考察4岁儿童的自传式回忆的表述特征。研究对象为76名4岁儿童(男25,女51),让他们在实验室中面对陌生实验员和另三名儿童讲述自己过生日的经历。对录像材料的编码分为四个维度:对事件回忆的逻辑顺序性、事件内容的丰富性、表述的主动性以及讲述时的身体姿态。结果表明:(1)儿童在对过去事件做自传式回忆时,在事件回忆的逻辑顺序性方面,能够独立地按照事件发生顺序回忆的儿童占36.8%。(2)在进行自传式回忆时,儿童每人平均说出17个事件,25个字。(3)4岁儿童在陌生情境中对过去事件进行自传式回忆的能力表现接近于正态分布。(4)4岁儿童自传式表达的主动性与顺序性及含字量之间,事件个数与含字量及顺序性之间,顺序性与体态之间均存在显著的正相关关系。
强激光与粒子束 , 2005,
Abstract: ?从速率方程出发,建立了单点侧向泵浦掺yb3+双包层光纤激光器的理论模型并进行了数值分析,得到了泵浦光方向分别为正向、反向、双向时,光纤内泵浦光和激光功率的分布特性及输出功率与泵浦点位置的变化关系。结果表明,相对于泵浦光正向或反向传输,当泵浦光双向传输时,光纤中的激光功率分布和输出激光功率受泵浦点的位置影响较小,对于侧向泵浦的双包层光纤激光器是较好的选择。
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