VARIATIONAL ITERATION SOLVING METHOD FOR SEA-AIR OSCILLATOR MODEL OF INTERDECADAL CLIMATE FLUCTUATIONS

Atmospheric physics is a very complicated natural phenomenon and needs to simplify its basic models for the sea-air oscillator. And it is solved by using the approximate method. The variational iteration method is a simple and valid method. In this paper the coupled system for a sea-air oscillator model of interdecadal climate fluctuations is considered. Firstly, through introducing a set of functions, and computing the variations, the Lagrange multipliers are obtained. And then, the generalized expressions of variational iteration are constructed. Finally, through selecting appropriate initial iteration from the iteration expressions, the approximations of solution for the sea-air oscillator model are solved successively.

Asymptotic Solutions to a Nonlinear Climate Oscillation Model

A class of nonlinear global climate oscillation models is considered. Using perturbation theory and its methods, solutions to the asymptotic expansions of some related problems are constructed. These asymptotic expansions of the solutions for the original problem possess a higher approximation. The perturbed asymptotic method is an analyti cmethod.

Asymptotic solution for EI Nino-southern oscillation of nonlinear model

A class of nonlinear coupled system for EI Nino-Southern Oscillation （ENSO） model is considered. Using the asymptotic theory and method of variational iteration, the asymptotic expansion of the solution for ENSO models is obtained.

藏药四数獐牙菜的质量标准研究

目的:建立藏药四数獐牙菜药材的质量标准。方法:采用《中国药典》方法测定水分、总灰分、酸不溶性灰分和浸出物的含量,采用显微、薄层色谱法建立药材鉴别方法,采用HPLC法测定药材中龙胆苦苷的含量。结果:确定了四数獐牙菜药材的显微鉴别特征,建立了以龙胆苦苷为指标的薄层鉴别及含量测定方法。四数獐牙菜药材中龙胆苦苷的平均含量为3.11%。结论:该方法操作简便,准确可靠,重现性好,可用于藏药四数獐牙菜药材的质量控制。

Solution of Travelling Wave for Nonlinear Disturbed Long-Wave System

非线性的扰乱的长波浪的系统的一个类的旅行波浪解决方案的近似表达式用概括变化重复方法被构造。

Singular perturbation for the weakly nonlinear reaction diffusion equation with boundary perturbation

In this paper, a class of nonlinear singularly perturbed initial boundary value problems for reaction diffusion equations with boundary perturbation are considered under suitable conditions. Firstly, by dint of the regular perturbation method, the outer solution of the original problem is obtained. Secondly, by using the stretched variable and the expansion theory of power series the initial layer of the solution is constructed. And then, by using the theory of differential inequalities, the asymptotic behavior of the solution for the initial boundary value problems is studied. Finally, using some relational inequalities the existence and uniqueness of solution for the original problem and the uniformly valid asymptotic estimation are discussed.

广州动物园“自然笔记”项目探讨

“自然笔记”是自然教育的一种形式,近年来在各个学校和自然教育机构的教学实践中均有显著的教育效果。广州动物园开展的“自然笔记”项目,通过室内授课及户外实践环节,为亲子家庭提供了以鸟类为主的自然观察活动。对比介绍市内类似项目的开展和发展情况,统计分析广州动物园项目中学员的评价及意见反馈,结果表明广州动物园具备开展“自然笔记”项目的各项优势条件,开展情况令人满意。

流行性传染病传播系统的奇摄动解

讨论了一类流行性病毒传染问题,提出了传染病传播生态系统动力学模型,利用奇异摄动方法,首先构造初值问题的外部解,然后引入伸长尺度变量构造了问题解初始层校正项,最后利用合成展开理论得到了生态系统初值问题的渐近解。并利用微分方程的比较定理证明了对应的生态系统的渐近解的一致有效性,同时举出了一个例子,说明了利用奇异摄动方法得到的生态系统的渐近解具有较好的近似度。

藏族药川西獐牙菜化学成分与生态因子的相关性分析

目的:建立川西獐牙菜的HPLC指纹图谱,研究不同产地样品化学成分与生态因子的相关性。方法:采用高效液相色谱法(HPLC),采用Wondasil C18色谱柱(4. 6 mm×250 mm,5μm),流动相甲醇-0. 2%磷酸溶液,梯度洗脱,柱温30℃,流速1. 0 m L·min-1,检测波长254 nm,建立川西獐牙菜的指纹图谱,结合国家药典委员会颁布的'中药色谱指纹图谱相似度评价系统2004A版'进行评价分析;并收集各产地样品的气候、土壤等生态因子数据,利用DPS数据处理系统,SPSS 21. 0统计软件对不同产地药材的化学成分与生态因子进行灰色关联度和双变量分析。结果:建立了川西獐牙菜药材的HPLC指纹图谱,共标定12个共有特征指纹峰,确定了7个峰的化学成分;川西獐牙菜中的獐牙菜苦苷、芒果苷等化学成分与生态因子具有显著的相关性,对化学成分影响较大的为气候因子中的月均温范围、年降水量和降水季节性,以及土壤因子中的土壤中有机碳比例和土壤酸碱度。结论:川西獐牙菜药材的化学成分与外部生态因子有一定的相关性,研究结果为该药材的人工种植及藏族药'生地性'理论诠释提供了参考依据。