查询词典 calculus of approximations

Furthermore the numerical flux from the Riemann solver is delicately expressed in a compact manner, say by the well known Godunov flux function, which paves the way to full investigation of numerical approximations.

由上述的Riemann解所提供的数值流通量经仔细验证后可以被简洁地表示为Godunov流通量的函数值，这为研究一般意义下的数值逼近铺平了道路。

With degenerate approximations to the oneway LippmannSchwinger integral equation, we study a category of wideangle degenerate migrators that permit the implementation of seismic migration using fast Fourier transforms alone.

通过对LippmannSchwinger单程波动积分方程的退化核逼近，本文研究了一类宽角退化算子的偏移成像。

Wideangle parabolic approximations to wave equation usually lead to nonconstant differential migrators with their coefficients varying with lateral velocity variations, and hence require a finitedifference numerical implementation.

波动方程宽角抛物逼近得到的通常是非常系数的单程波传播算子，其系数是速度横向变化的函数，因此需要利用有限差分进行数值实施。

On the basis of taking full advantage of multi scale wavelet analysis,the proposed algorithm improves the contrast of the approximations of the wavelet transform through two lifting steps,and shrinkages the coefficients of wavelet transform on the diferent degree and then enhances the coefficients.

在多尺度分析基础上，该算法对小渡分解得到的低频子带图像采用两步提升法进行对比度增强处理，而对小波分解得到的不同方向上的小波系数进行不同程度的去噪并增强。

Under priority service discipline, the diffusion approximations for a three-stations reentrant networks and a class of the re-entrant networks were studied.

在优先服务原则下，研究了一个三服务台重入型网络和一个任意多个服务台重入型网络的扩散近似。

Questions in this content area are based on basic operations using whole numbers, decimals, fractions, and integers; place value; square roots and approximations; the concept of exponents; scientific notation; factors; ratio, proportion, and percent; linear equations in one variable; absolute value and ordering numbers by value; elementary counting techniques and simple probability; data collection, representation, and interpretation; and understanding simple descriptive statistics.

这方面的考试内容包括实数、小数、分数和整数的基本运算；位值；平方根和近似值；指数的概念；科学记数法；项；比率，比例以及百分比；只有一个未知数的线性方程；绝对值和数值的排列；初级的计数技巧和简单的概率；数据的收集、整理与说明；并理解简单的描述性统计数据。

Questions in this content area are based on basic operations using whole numbers, decimals, fractions, and integers; place value; square roots and approximations; the concept of exponents; scientific notation; factors; ratio, proportion, and percent; linear equations in one variable; absolute value and ordering numbers by value; elementary counting techniques and simple probability; data collection, representation, and interpretation; and understanding simple descriptive statistics.

算术（23%）运用所有的数字、小数、分数、整数；数位值、平方根、近似值；指数的概念；科学计算；因数；比率；比例；百分比；一次方程式；绝对值；基本计算方法和简单概率；数据搜集，演示，推理及简单统计分析的理解。

In chapter 2, the combined approximations of displacements, stress, and forces are introduced.

本文的第二章讨论了位移、应力和单元力的组合近似方法。

All force fields are based on numerous approximations and derived from different types of experimental data.

所有的力场都依赖于大量的近似，并且源于不同的实验数据。

We do not have the true figures so we will have to make some approximations.

我们没有真实的数字，因此只能作些粗略的估计。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。