二次公式

We designed four chips for different functions, fundamental separation fixed quantity chip, parallel separation fixed quantity chip, series separation fixed quantity chip, and combinative separation fixed quantity chip.

由此理论公式吾人设计了四种具不同功能功能性定量流体碟片，包括流体分流定量碟片、平行定量碟片、依序定量碟片、二次样品纯化定量碟片，经实验后其定量功能符合吾人所需功能。

A third order ENO finite volume method for hyperbolic conservation laws on unstructured triangular mesh is introduced.In order to obtain the third order accuracy on spatial discretization,a weighted quadratic interpolation is constructed on every triangular mesh.Two point Gauss quadrature formula is also used on each edge of every triangular mesh and the third order TVD Runge-Kutta method is used for time discretization.The numerical order of convergence and the numerical result of a mesh 3 wind tunnel with one step are given.

摘 要 基于双曲型守恒律方程，对非结构三角形网格给出了一种ENO(Essentially Nonoscillatory Scheme)型有限体积格式，方法的主要思想是先对每一个三角形单元构造一个加权的二次插值多项式，而在计算交界面的流通量时采用了两点高斯积分公式以保证格式的整体精度，时间离散采用三阶TVD Runge-Kutta方法。

According to expression of the secondary field in half infinite homogeneous medium space, this paper proposed an algorithm for calculating apparent resistivity based on neural networks.

本文从瞬变电磁均匀半空间二次磁场响应公式出发，提出了一种基于神经网络的视电阻率快速计算方法。

Based on integral formula, discrete second electrical field is expressed as a sum of elementary contributions coming from charges accumulated on the surfaces of resistivity discontinuity.

基于地下电流场的积分公式，离散化的二次电流场被分解为电性不连续界面上的一系列点电荷电场的代数和。

The formula of the second order Doppler shift of simple cubic monatomic nanocrystalline particle is reduced by means of the Green's function.

应用格林函数理论，推导了简立方单原子纳米晶体颗粒的二次多普勒移动公式。

Firstly the fuzzy entropy in quadratic form is modified by substituting standard negative operator of Zadeh with generalized negative operator of Sugeno, and the generalized fuzzy entropy formula is obtained.

首先将Sugeno广义否定算子替代二次型模糊熵公式的Zadeh标准否定算子，得到了参数型的广义模糊熵表达式；其次，将其应用于构造图像阈值化分割的准则函数；最后，给出了图像阈值化分割新算法中的广义模糊熵参数自动选取方法。

Therefore,a series studies of ice-pier vibration are performed from different aspects in this paper.The main work of this his thesis is summarized as follows:(1) Ice response spectra is proposed based on the idea of a seismic response spectra analysis of str .. uctures.Firstly,ice response spectra on the basis of power spectra density function is established;Secondly,based on the assumption of quadratic parabolic interpolation method,the nonlinear interpolation analysis method of ice response spectra is studied from both theoretical and practical points of view,and the successive computation formulas including ice displacement,velocity and acceleration response spectrum are deduced by Duhamel integral.Furthermore,to analyze the effectivity and applicability of the method, the real temporal curves of ice pressure are used to be studied.The results show that the presented method is more convenient and accurate to study the structural response induced by ice force,also it can be effectively applied in the design of ice resistance.

鉴于此，本文针对冰激桥墩结构振动问题从不同方面展开了一系列与之相关的研究，主要研究内容如下：(1)根据结构抗震反应分析思想提出了冰振反应谱，首先建立了基于功率谱密度函数的冰振反应谱；其次借鉴地震反应谱内插法的思想从理论和实际观点出发，假定在等距离微小时间间隔内冰荷载按二次抛物线规律变化，由Duhamel积分推导出冰振位移、速度以及加速度反应谱的一系列连锁公式，建立了基于非线性内插法的冰振反应谱，并利用实际冰压力时程曲线进行了冰振反应谱数值分析，为以后冰激结构振动的研究提供一种方便、简捷、精确的分析方法，也能够将其有效地应用到结构的抗冰计算中。

The algorithm has quadratic convergence and can speed up the EM computation.

该方法基于拟牛顿加速算法，并结合一种带调整参数的Broyden对称秩1校正公式来实现，具有二次收敛性，提高了EM的计算速度，降低了计算复杂度。

It also states that students "should know how to use quadratic functions to solve extremum problems in everyday life". It seems to me that befe all these, students should be properly taught the technique of completing the square (which underlies the solution of extremum problems of any kind) and the quadratic formula (which would then give *exact* solutions of quadratic equations).

我认为，在学习这些之前，应该适当地教给学生配平方的技巧（它是解决任何最值问题的基础），以及二次求根公式（它能给出二次方程的精确解）。

AD 600, he was a "great imperial history," as the first time, taking into account the sun's uneven campaign, and the creation of "space, such as quadratic interpolation formula" to calculate the days, months, five-star speed.

公元600年，他创《皇极历》，首次考虑到太阳视运动的不均性，创立"等间距二次内插法公式"来计算日、月、五星的运行速度。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。