导数

About the title of statistic of planar vector, probability, its solve problem process to permeating function form not only, and still permeating function thought; again criterion the tool that derivative is research function, had derivative, function content more appear profundity, rich and colorful.

有关平面向量、概率统计的题目，其解题过程不仅渗透着函数形式，而且还渗透着函数思想；再则导数是探究函数的工具，有了导数，函数内容就更显得深刻、丰富多彩。

In this dissertation, incorporating the level set algorithm, the gradient projection method, the nonlinear mapping technique, the return mapping algorithm and the mean curvature flow technique into topological optimization theory, a level set algorithm for topology optimization with multi-material structures is put forward, which can optimize a problem with general objective functions, multi-constraints, multi-materials and multi-load cases.

同时，又将拓扑导数理论和水平集算法结合起来，提出了结构拓扑优化的拓扑导数与水平集算法，进一步提高了计算效率。

The functions, latitude being parameter, are the quasi linear combination of the Legender functions and their derivatives, which can be evaluated by the recursive formulae of the Legender function and its derivatives.

它们关于纬度的函数是 Legender 函数及其导数的拟线性组合，可由目前熟知有关 Legender 函数及其导数的递推公式给予赋值。

According to two hypotheses: one for the relation between the dynamic complex stiffness and the material dynamic characteristics, another for the relation between the static displacement and the force acting on the element, the predicting formula for rectangular cross section are obtained respectively using the static stiffness formulation from the beam——column theory and the G〓bel method.

利用粘弹性材料的标准导数和分数导数模型的本构关系，建立了动态储能和损耗模量函数的关系式，由材料特性实验确定其中的参数，按元件的动态复刚度和材料动态特性之间与元件静态位移与作用力之间的关系假定，依柱梁理论或G〓bel的方法建立的静刚度表达式，建立了矩形截面环元件的刚度和阻尼的预测公式。

In this paper,the principle of a new absorbance ratio derivative method was described.The experimental methods of derivation with subtraction technique on ordinary spectrophotometer and simultaneous determination of phenol and resorcin were studied.The result is satisfying.

本文叙述了吸光度比值－导数光谱新方法的原理，研究了在普通分光光度计上用计算法完成吸光度比值导数运算、同时测定苯酚和间苯二酚含量的实验方法，取得了较为满意的结果。

At first, this thesis gives right calaculation results of derivative of Daubechies scaling function, the determine fashion of continuity is rendered.

本论文首先推导了Daubechies尺度函数导数或高阶导数的正确计算结果，给出了它的连续性的判定方式。

The second derivative of f with respect to x; the derivative of f '.

f对x的二阶导数；亦为f'的导数。

First, the series 60 (Cb=0.6) model is used to verify the accuracy of maneuvering derivatives measured by PMM. After that, the same experiment process is applied to determine the derivatives of 1200G/T purse seiner and 730G/T tuna fishing vessel.

首先，吾人利用series 60(Cb=0.6)船模进行实验，以验证PMM仪器所求得各操纵性导数的准确性；然后，针对1200G/T美式围网渔船及730G/T鲔延绳钓渔船，进行PMM实验，求得操纵性导数。

Furthermore, in order to greatly improve computational efficiency, another topological optimization method, named as a topological derivative and level set algorithm for topology optimization, is also proposed by unifying topological derivative theory with the level set method.

同时，又将拓扑导数理论和水平集算法结合起来，提出了结构拓扑优化的拓扑导数与水平集算法，进一步提高了计算效率。

On the basis of the mathematical model, the dynamic derivative of the aircraft at the different angles of the tailplane was analyzed using the technique of dynamic derivative simulation.

在非定常建模的基础上，采用动导数仿真，分析了不同平尾偏角时的动导数，结果表明，水平尾翼偏角主要对零动态阻尼所对应迎角有较大影响，随着舵偏角的增大，该迎角减小。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。