微分

In Exercises-, use the Chain Rule to find the indicated partial derivatives.

在证明其中一个版本的连锁律时，我们必须用到多变数函数的可微分观念。

His contribution was to provide a clear set of rules for manipulating infinitesimal quantities, allowing the computation of second and higher derivatives, and providing the product rule and chain rule , in their differential and integral forms.

他的贡献是提供了一套明确的规则，操纵微不足道的数量，使计算的第二个及以上衍生产品，并提供产品的规则和链的规则，在其微分和积分形式。

The paper deals with curvature line and curvature characteristic of developable surface based on differential invariant of developable surface and it details curvature line and curvature characteristic of cone and tangent surface .

本文通过可展曲面的微分不变量，导出可展面的曲率线与曲率特征，并以锥面和切线曲面为例阐明这些特性的几何意义。

The Computer-aided method also exploits the characteristic of linear differential equation with two additional approximations.

计算机辅助法也充分利用了线性微分方程的特点及另外两个合理的近似条件。

Next, determining natural frequencies of the structure is transformed as a problem belonging to finding a characteristic value of characteristic function in the above differential equation.

把该结构的固有频率问题归结为求解该微分方程特征函数的特征值问题。

The characteristic of fractional order differential equation iscontaining the non-integer order derivative. It can effectively describe the memory andtransmissibility of many kinds of material, and plays an increasingly important role inengineering, physics, finance, hydrology and other fields.

分数阶微分方程的特点是含有非整数阶导数，能非常有效的描述各种各样的物质的记忆和遗传性质，在工程，物理，金融，水文等领域发挥越来越重要的作用。

The negative differential resistance characteristic equation of single electron transistor and metal oxide semiconductor hybrid structure SETMOS is simplified by fitting method. And a new approach is proposed for designing multi-scroll chaotic circuit with SETMOS.

利用拟合法简化了单电子晶体管与金属氧化物半导体混合结构器件——SETMOS的负微分电阻特性方程，提出了由SETMOS设计多涡卷混沌电路的方法。

In particular,the phase function of the disturbance wave system is solved by uting the characteristic theory of partial differential equation and an expan sion of Orr-sommerfeld eigenvalue problem,insteade of using the disturbance model which was given previously.

其特点是。应用偏微分方程特征理论以及O－S方程特征值的展开，求解扰动波的相函数而不是预先给定扰动波的波动形式。

Neutral difFerential equation; characteristic ... 2007042712 Annals of Differential Equations 英文 OSCILLATION IN FIRST ORDER NEUTRAL DIFFERENTIA...

二阶微分方程；超线性；振动 2007042714 海南师范学院学报中文 OSCILLATION THEOREMS FOR NONLINEAR SECOND ORDE。。。

According to that characteristic and based on the differential equation of the deformed surface of the orthotropic plate, with one principal direction size fixed, changing another principal direction size linearly, maintaining elasticity coefficient the same as in the first principal direction and Poisson ratio equal to the geometric mean of two principal Poisson ratios, the original orthogonal plate is equivalent to an isotropic plate. Results obtained show that the deflections of the equivalent isotropic plate are the same as the deflections of the original orthotropic plate at the corresponding points, the forces of the correspondent points have simple relations.

根据这一特性、从正交各向异性板挠曲面的偏微分方程出发，保持一个主方向尺寸不变，另一主方向的尺寸做线性缩放，保持弹性模量与第一主方向相同，泊松比取2个主方向泊松比的几何平均值，将这类正交各向异性板等效为一块各向同性板；通过分析得到：各向同性板任意点的挠度就是原正交各向异性板对应点的挠度，各对应点内力之间存在简单的比例关系，该文的方法将为工程技术人员提供方便，同时可以更加直观的认识正交各向异性板的受力。

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。