derivative term

Porphyrin is a general term of the homologue and derivative of porphyrin with substituting groups at the outside ring.

卟啉是卟吩环上外带有取代基的同系物和衍生物的总称。

The nested Lyapunov level sets are introduced such that control may be proposed based on the derivative of the piece-wise Lyapunov functions. The derived control law contains discontinuous term and tendency-rate term.

引入一组嵌套的Lyapunov级集，并根据分段Lyapunov函数导出控制律，该控制律含有不连续控制项和趋近率项。

Making use of the fourth-order compact difference formula of the first derivative term, anew high accuracy difference scheme for the two-dimensional convection reaction equation is proposed.

利用一阶偏导数项的四阶紧致差分算子，直接推导出了数值求解二维对流反应方程的一种新的高精度紧致差分格式。

In this thesis, the time derivative term of the control equation is left multiplied by Turkel preconditioning matrix. Several preconditioned time and space discrete schemes are derived in details.

本文通过在控制方程时间导数项左乘Turkel预处理矩阵，详细推导了适用于不同时间推进格式以及空间离散格式的低速预处理过程。

The greatest sum of the exponents of the variables in a term of a polynomial or polynomial equation. There is a power law relation between the modificatory factor and the time derivative of the period.

次数多项式或多项式方程中变量的幂的最大数从统计上得到修正因子与周期变率的幂律关系。

For countries with more frequent and sometimes larger exchange rate fluctuations, the focus should be on short-term transaction exposure plus the net cost of or return from risk management including some derivative instruments for hedging.

对于汇率变动较为频繁，有时波动幅度较大的国家，应将管理的重点放在短期交易风险上，同时综合考虑风险管理成本和收益，合理使用一些衍生工具进行保值。

WCNS-E-5 consists of fifth-order weighted explicit nonlinear scheme for the inviscid term of Navier-Stokes equations, fourth-order accurate scheme for the viscous term, the corresponding fourth-order boundary scheme and fourth-order difference discretization for grid partial derivatives and temperature partial derivative.

该算法采用的是五阶精度加权显式非线性格式，结合四阶精度的二阶偏导数差分近似、四阶精度的边界格式，同时还对网格偏导数及温度梯度也离散为四阶精度。

Therefore, we directly approxi-mate the second derivative term using a conservative flux difference.

所以我们采用一个守恒的流通量差分，对二阶导数项直接进行逼近。

From the scale analysis it is found that on the average in the equation of motion the term of the time derivative is one order of magnitude smaller than the main terms in the meso-and small-scale motion.

由尺度分析可以发现：在一般中小尺度运动方程中，时间导数项较其中的各主要项小一个量极。