近似法

Within the framework of the effective-mass approximation, hydrogenic impurity states confined in a cylindrical zinc-blende GaN/AlxGa1-xN single quantum dot are investigated by means of a variational approach.

在有效质量近似下，用变分法研究了闪锌矿GaN/AlxGa1-xN单量子点中的类氢杂质态。

By using active set strategy, the authors need only to solve a reduced trust region subproblem which is solved inexactly by the truncated conjugate gradient method.

作者利用有效集策略，在每次迭代中只需求解一个低维的信赖域子问题，该信赖域子问题是通过截断共轭梯度法来近似求解的。

By establishing a new comparison principle,and using method of L-quasi-upper and lower solutions and mixed monotone iterative technique,the results of existence and uniqueness of solutions to Cauchy problem s of first order nonlinear integrodifferential equations in Banach spaces are obtained.

通过建立一个新的比较原理，利用L-拟上下解方法和混合单调迭代法，研究了Banach空间中一阶非线性积分微分方程初值问题解的存在唯一性，并给出了近似解的迭代序列和误差估计式。

In order to know irradiant dynamic process we must have excitation crosssection of electron collision with molecule. Incident electron energy is inintermediate range. At low energy, there are several good methods thatcalculate electron collision with molecule for example Variation, R-matrix.

此时入射电子的能量已经达到中能，在低能范围内的电子与分子散射有许多好的方法如变分法、R-矩阵方法，在高能范围内利用Born近似等方法也能得到满意的结果，在中等能量范围的电子与分子碰撞则没有相应的成熟的方法，使用比较多的是密耦(Closing-Couple)方法，这种方法将相互作用势分为静态势、交换势、极化势，在耦合态的选取上比较自由，可以根据实际的问题及分子的特性选取耦合作用比较强的通道，这样既能保证精度又能减少计算量。

The approximation solution of the biomathematical model of muscular blood vessel under the condition of the nonresonant case is obtained. The expansion method for two variables of perturbation theory is used and the approximation solutions are given to the biomathematical model of muscular blood vessel under two cases.

求得了具有小阻尼、硬外激励的肌型血管生物数学模型在非共振情形下的一次近似解，并利用两变量展开法，经方程演化，求得了具有小阻尼、弱外激励的肌型血管生物数学模型在非共振和共振两种情况下的首次渐近解。

He was a member of the redactional committees for Psychometrika, Numerische Mathematik, Linear Algebra and Its Applications, and has been editor in chief of the SIAM Journal on Numerical Analysis.

而在用最小二乘法(1east—squares)对矩阵进行近似计算时，目前常用到的一种变换法也是由豪斯霍德创造的，因而被称为&Householder transformation&。

Plasma specific antibodies IgA, IgG, IgM to Cpn were measured by microimmunofluorescence test. A group of individuals with Cpn specific IgA (titler:32) suggested chronic Cpn infection were compared with a group of control subjects with IgA (titler:32). Blood specimens were drawn for determination of serum lipids and Cpn antibodies. And the serum lipids profile were compared in the two groups.

横断面研究方法；采用微量免疫荧光法检测血浆中肺炎衣原体特异性抗体，以肺炎衣原体IgA升高（滴度≥1：32）的125名健康体检者为研究组，以性别、年龄近似但IgA必抗体效价不升高（滴度：32）的64名同期体检者为对照组，比较2组血清总胆固醇、甘油三酯水平的差异。

When the segments for trapezia method become very small, the approximate performance curves perfectly agree with the theoretical curves.

在较小的分段数下，采用梯形法的OSTBC近似性能曲线与理论曲线吻合。

A simplified model was proposed to simulate material microstructure according that metal solidification is a Monte Carlo process. First, use the point of"putting randomly, growing uniformly"to generate grain boundary, then recognize grain boundary trifurcate points, eliminate bad trifurcate points, and distinguish the connections among these points, thus obtain straight grain boundary picture.

根据金属凝固过程是—Monte Carlo过程，建立了金属材料显微组织的简化Monte Carlo方法，采用&随机投放，等速生长&的方法形成矩齿形晶界图，并通过逐点判断法识别出晶界三重点，剔除奇异三重点，并识别出晶界及晶界间相邻关系，从而获得晶界结构的直线近似形态图，为细观组织短裂纹的数值模拟作好准备。

The computer aided 3-dimensional simulation of rectangular tile coating on ship hull requires a local area on the total undevelopable surface to be approximately flattened, and the point-to-point correspondence of the plane and submarine surface to be established.

以船体表面敷设矩形柔性瓦的计算机三维仿真设计为背景，提出了不可展曲面局部区域近似展开均匀环形网格法，并以此算法为基础，在MDT平台上开发出一套工具包来完成矩形瓦敷设仿真设计。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。