求值

The method using the hierarchy characteristics of website and user interest,based on ant colony algorithm,considering a user's website browsing process as an ant foraging behavior,counts degrees of pheromones and supports on corresponding path in every level,and gets node's preference function values,then finds user interest model by this value.

该方法根据网站和用户兴趣所具有的层次性特征，利用蚁群算法，将用户对网站结点的一次浏览过程，对应于蚂蚁的一次觅食活动周期，从各个层次求出相应路径的信息素浓度和支持度，从而得到用户对该结点的偏好函数值，再依据此值求得用户兴趣模式。

It is well known, asks the function the most value is one of middle school mathematics important contents.

众所周知，求函数的最值是中学数学的重要内容之一。

The deviation factor of natural gas is a great significant parameter for the gas reservoir engineering calculation,which is mainly obtained by the Standing-Katz graphic solution or empirical formula calculation.

天然气偏差因子是气藏工程计算中一项相当重要的参数，多采用Stand ing-K atz图版或经验公式求取，其中图版法人工读值误差较大且不便于计算机应用，而各种经验公式的计算精度和适用范围又难以确定。

First, based upon the fields in the single cavities, open and short modes are constructed, whose coupling holes on disks are shorted magnetically and electrically respectively. Second, the whole field in the chain is expanded with the short and open modes. With the Galerkin method and the second vector Green theorem, it is possible to describe the physics problem by a simple general eigenvalue matrix equation. Here, the dispersion curves in periodical structures are available.

它首先利用有限元等方法计算各加速单腔中的电磁场，根据一定规则构造成所需的开模和闭模，然后把整个长腔链加速结构中的场用这些开模和闭模展开，再利用伽略金方法和第二矢量格林定理进行数学变换，考虑各模式在加速腔壁和腔间耦合孔处的边界条件后，就能把加速结构中电磁场用数学上的广义本征值矩阵问题描述，从而能够得到所求的色散曲线和电磁场形态。

According to the difference of Doppler spectra of meteor trail echo and clutter of ground and sea,a FIR high-pass filter is designed to filter out clutter and so the meteor trail echo becomes obvious.

该文根据地海杂波与流星干扰在多普勒谱上的差别，提出了用FIR型高通滤波器滤除杂波使流星干扰凸显出来；再根据流星干扰的分布特点分段计算背景噪声均值，求取流星干扰检测门限；最后用杂波信号来插值流星干扰位置上的数据，消除因去除干扰造成的杂波相位不连续。

According to the difference of Doppler spectra of meteor trail echo and clutter of ground and sea, a FIR high-pass filter is designed to filter out clutter and so the meteor trail echo becomes obvious. Then a smart threshold is obtained from the minimum mean of different segments of background noise and used to detect the meteor trail echo. Finally the phase discontinuity of clutter from the meteor trail echo suppression is eliminated by substituting the data at echo positions with clatter.

该文根据地海杂波与流星干扰在多普勒谱上的差别，提出了用FIR型高通滤波器滤除杂波使流星干扰凸显出来；再根据流星干扰的分布特点分段计算背景噪声均值，求取流星干扰检测门限；最后用杂波信号来插值流星干扰位置上的数据，消除因去除干扰造成的杂波相位不连续。

To study the effect of gravity eccentricity on the ranges,the expression of gravity was educed using spherical harmonic function when the earth is considered as an normal ellipsoid or sphere.

为了研究地球的重力偏心对射程的影响，用球谐函数展开法推导了地球为正常椭球体和圆球体时的重力表达式，对地球的重力偏心进行了计算分析，求出了偏心值。

This approach will enable the different investors bear the risk, and access to the corresponding rewards. The first two methods did not consider investors attitudes of risk and the expected price of the spot or futures. However, the hedger of the maximize effectiveness calculates the optimal hedge ratio through the establishment of investors utility function and calculus.

前面两类方法都没有考虑投资者的风险态度和对现货或者是期货价格走势的预期，而效用最大化套期保值通过建立投资者的效用函数，再利用微积分求最值的方法来计算最优套期保值比率。

By means of the Hermite interpolation formula with second derivative,a type of integrating formulas with second derivative is derived.

利用带二阶导数的Hermite插值公式，导出一类具有二阶导数的求积公式。

The procedure described above applies to the eigenvalues and eigenfunctions of any Hermitian operator.

用上述运算方法也能求出任一厄密算符的本征值和本征函数。

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。