查询词典 derivative

Firstly, The sufficient con-ditions of the existence and uniquity of the positive equlibria by applying functional derivative isobtained; Secondly, the global attractability of the positive equlibria is investigated by charateristicroots theory and oscillation theory; Thirdly, regarding the delay as a parameter, conditions of theexistence of Hopf bifurcation and the peridic solution, furthermore, the form of the approximateperidic solution are obtained; Finally, Some specific examples are given and the solution diagrameappears by Matlab.

首先利用导数性质，得到了该模型正平衡态存在惟一性的充分条件；其次，利用特征值和振动性理论得到了该模型正平衡态全局渐近稳定性充分条件；然后，应用Hopf分支理论证明了该模型Hopf分支及近似分支周期解的存在性，并给出了周期解的近似表达式；最后，借助于MATLAB数学软件，举例并绘出了模型数值解的拟合图象，验证了文中定理条件的可行性。

Local discontinuous Galerkin method for convection-dominated diffusion problems with periodic boundary conditions is constructed. To deal with the derivative of second order, an auxiliary variable is introduced. The stability and error estimations are presented simultaneously.

针对具有周期性边界条件对流占优的扩散问题中的二阶导数，引入辅助变量，构造了局部间断Galerkin方法，并给出了方法的稳定性结果和误差估计式。

Douglas and Russell first presented the idea of characteristics in[13],in whichthe diffusion term is included in the derivative of characteristic direction of the solu-tion and the backward difference quotient along the time axis was replaced by it alongcharacteristic direction.

Douglas，Russell[13]最先提出了特征法的思想，其主要特点是将模型方程的对流项隐含在解沿特征方向的导数之中，以沿特征方向的向后差商逼近取代通常方法中沿时间方向的向后差商逼近。

An improved derivative estimation algorithm with a low-pass filter that can suppress the influence of high-frequency noise is suggested to remove potential drawbacks of the backward difference that was applied in neural network inversion dynamic compensation method, such as large estimation error in the presence of noise and price increase of hardware realization when high estimation accuracy is required.

针对神经网络逆动态补偿策略中基于向后差分的微分估计算法在噪声环境下存在较大的微分估计误差，且提高估计精度会增加硬件成本等缺陷，提出了改进的微分估计算法，并以加速度传感器为例，设计了动态补偿实验装置，给出了基于改进的微分估计算法的动态补偿算法的实现步骤。

In fact,'the stock market has been such a consistent generator of cash flow, it's become a yield engine that's quite similar to the bond market,' says Dean Curnutt, head of equity derivative and convertible sales at Banc of America Securities.

美银证券股票衍生产品和可转换产品销售部的负责人迪安科纳特说，事实上，股票市场已经成了一台持续创造现金流的机器，它已变成了一部与债市十分类似的收益率引擎。

Letter of China Banking Regulatory Commission on Approving the Initiation of Dealings of Derivative Products by Shanghai Branch of Banca Intesa S.P.A.

中国银行业监督管理委员会关于批准意大利联合银行股份有限公司上海分行开办衍生产品交易业务的函-www.lawinfochina.com

Aiming at the fact that the direct on-line instrument measuring the Baume degree of black liquor is very expensive,by means of soft measuring technique,an indirect way to figure out Baume degree is proposed by detecting derivative pressure and temperature of the black liquor on-line.

针对黑液波美度直接在线检测仪表价格昂贵的现状，采用软测量技术，通过在线检测差压和温度来间接换算出波美度。

A good part of the problem in the financial sector is being caused by a beastie called the credit default swap which is a derivative.

对于财政部门来说，所谓"信用违约互换"的衍生物正在产生一个积极的方面。

The beef extract, a beef derivative, is a source of organic carbon, nitrogen, vitamins, and inorganic salts.

牛肉萃取物是一种牛肉衍生制品，可以作为有机碳、氮、维生素与无机盐类的一个来源。

The accurate content of benzimidazole derivative could be obtained by the traditional chemical titration method.

初步确定影响分析结果的杂质为未完全反应的原料之一邻苯二胺。

The shaping method of noncircular part and the tool holder's radial motion characters in noncircular turning process are discussed in detail in the thesis.

论文详细研究了非圆零件的成型方法和加工过程中刀架的径向运动规律。

I have not really liked him,I do not like his this kind of disposition.

我没有真的喜欢他，我不喜欢他的这种性格。