用ICP-AES法测定中药野马追的微量元素

用电感耦合等离子体原子发射光谱ICP-AES同时测定了野马追中的Fe、Al、Si等20种元素,用干法对样品进行处理.干法是先将样品600℃高温灰化,再用浓硝酸消解.将ICP-AES法用于野马追微量元素的测定具有简单、快速、准确度高的优点.     

耦合KdV方程组的精确解

利用推广的变形映射方法,求出了耦合KdV方程组的大量的精确解,这些解包含了孤子解,三角函数解,椭圆函数解,幂函数解等。     

Effect of boundary conditions and convection on thermally induced motion of beams subjected to internal heating

Numerical exercises are presented on the thermally induced motion of internally heated beams under various heat transfer and structural boundary conditions. The dynamic displacement and dynamic thermal moment of the beam are analyzed taking into consideration that the temperature gradient is independent as well as dependent on the beam displacement. The effect of length to thickness ratio of the beam on the thermally induced vibration is also investigated. The type of boundary conditions has its influence on the magnitude of dynamic displacement and dynamic thermal moment. A sustained thermally induced motion is observed with progress of time when the temperature gradient being evaluated is dependent on the forced convection generated due to beam motion. A finite element method (FEM) is used to solve the structural equation of motion as well as the heat transfer equation.     

Banach空间混合型积分-微分方程初值问题的唯一解

在不使用任何紧型条件的假设下 ,得到Banach空间中一类非线性混合型积分 -微分方程初值问题的唯一解、解的迭代逼近序列以及误差估计     

Unified Krylov-Bogoliubov-Mitropolskii method under a critical condition

A modified and compact form of Krylov-Bogoliubov-Mitropolskii (KBM) unified method is extended to obtain approximate solution of an nth order, n=2,3,…, ordinary differential equation with small nonlinearities when unperturbed equation has some repeated real eigenvalues. The existing unified method is used when the eigenvalues are distinct whether they are purely imaginary or complex or real. The new form is presented generalizing all the previous formulae derived individually for second-, third- and fourth-order equations to obtain undamped, damped, over-damped and critically damped solutions. Therefore, all types of oscillatory and non-oscillatory solutions are determined by suitable substitution of the eigenvalues in a general result. The formulation of the method is very simple and the determination of the solution is easy. The method is illustrated by an example of a fourth-order equation when unperturbed equation has two real and equal eigenvalues. The solution agrees with a numerical solution nicely. Moreover, this solution is useful when the differences between conjugate eigenvalues (real or complex) are small. Thus the method is a complement of the existing modified and compact form of KBM method.     

一类时滞中立型微分方程的振动性

研究时滞中立型微分方程的正解的振动性,给出了方程的所有正解振动的新的充分条件,改进了已有的结果．证明了一个猜想的正确性．     

中国公共卫生服务水平区域差异分析

根据公共卫生服务的概念和内涵建立了评测指标体系,并利用因子分析法和聚类分析法对2008年中国各省域的公共卫生服务水平进行综合评价;利用耦合协调度模型对公共卫生服务水平与经济发展耦合的省域差异进行了深度分析,进而利用制约度指标对中国总体公共卫生服务水平进行了病理诊断,并提出了相关的政策建议。     

具有滞后、超前项的泛函差分方程的单调迭代技术

通过构造单调迭代序列,证明同时含有滞后、超前项的泛函差分方程解的存在性问题．     

一类Q_K型空间的无导数刻画

给出了一类QK型空间的两个等价刻画,一个是用双重积分表示的,另一个用在Bergman度量下的一些振荡表示的。由于它们都没有使用导数,故我们称为无导数刻画。     

太阳核聚变正以周期约5分钟间歇地进行着

由太阳核聚变正在间歇地进行着理论出发,结合太阳核反应区中3He粒子数密度变化与太阳5分钟振荡现象,可得结论:太阳核聚变正以周期约5分钟间歇地进行着。