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The Savitzky-Golay differentiator can efficiently reduce the noise amplification effect of the numerical differentiation operator in axial strain calculation of ultrasound elastography.

采用Savitzky-Golay差分器可以有效地减小超声弹性成像的纵向应变计算过程中数值微分操作对于噪声的放大作用。

A comparison with the analytic result for vertical displacement in homogeneous medium demonstrates that the staggered-grid differentiation operator almost achieves as the same accuracy as the analytic method.

在均匀介质中，将错格伪谱微分算子计算的结果和解析解进行比较，结果表明本文算子几乎达到了解析解的精度。

The validity of staggered grid real value FFT differentiation operator is confir med by comparing with the analytic CagniardDe Hoop method in the half space SH problem.

将该方法和CagniardDe Hoop解析法在求解半无限空间地震波动的问题中进行比较，结果表明，新微分法的精度和解析方法的精度相同。

By automatically selecting the optimal diffusion constant and iterative number, the filtering process is totally automatic and does not require any operator assistance and the diffusion is suppressed or stopped at boundaries and edges and small structures are retained.

正是在这样的背景下，本研究针对计算机集成相控HIFU治疗计划中的两项关键技术：序列医学断层图像的分割及其体视化技术，进行了理论研究和算法的设计。

In this paper, a new approach, which is based on simulated annealing algorithm for solving a class of diffusion equation of parameter operator identification of inverse problem, is presented.

文章给出了利用模拟退火算法求解一类扩散方程的参数算子识别反问题的一种新方法。

We also study the CP-violating asymmetry in nonleptonic decay Λ→ pπ. By employing the Skyrme model to calculate this decay amplitude contributed by the gluonic diploe operator, we find a possible large CP-violating asymmetry could be expected, which is consistent with the previous study.

在计算supersymmetricextensions of the standard model中Λ→pπ衰变过程中CP破坏不对称性时，我们使用了Skyrme模型计算了其中关于强子振幅部分，结果显示相对于标准模型的预言有较大的放大效果，这个结果和前人研究结果一致。

The asymptotic estimations of solution of initial value problem are obtained for Dirac equation by use of the transformation matrix operator in this thesis.

本文运用平移算子，得到了Dirac方程初值问题解的渐近估计。构造了一个整函数ω，其零点集合与具有一般两点边界条件的Dirac特征值问题的特征值集合重合。

Image matching algorithm which based on directed Hausdorff distance and immune genetic algorithm consists of defining code and adaptive degree function, confirming intercross variation operator and immune operation.

部分Hausdorff 距离和免疫遗传算法相结合的图像匹配算法包括：定义编码与适应度函数、确定交叉变异算子及免疫操作。

The finite dimension approximating solution for initial-boundary value problem of coupling nonlinear system of hyperbolic equation is constructed by orthogonal basis of characteristic value sequence of the Laplace operator in the Dirichlet boundary conditions.

以Laplace算子在Dirichlet条件下的特徵值序列为正交基底构造耦合非线性双曲型方程组初边值问题的有限维近似逼近解，证明该逼近解的一致收敛性。

For the dynamic system of discrete coupled and nonlinear three phase voltage source PWM rectifier, the cycle switch average operator is introduced to transform the discrete system into continuous and the small signal perturbation method is used to transform the nonlinear system into linear, the small signal dynamic mathematical models are set up.

中文摘要：针对三相电压型PWM整流器这个离散的、耦合的、非线性的动态系统，引入开关周期平均算子将离散的系统变换为连续的系统，应用小信号扰动法将非线性的系统化解为线性的系统，进而分析系统的小信号动态数学模型。

Effective local search tactics reaches local searchers when they are ready to buy - with every way that it is possible for them to buy from you.

有效的地方搜索策略达到当地的搜索，当他们准备购买-以各种方式，这是他们有可能从您那里进行购买。

The first two are periodic sentences for their beginnings; and the fifth and the last are also periodic sentences each for the embedding of a parenthetic structure.

1960年代中后期，当战后女权主义和当时的许多其他抗议运动在西欧和北美发展成某种势力时，性别的概念演绎成补充和延伸生物性别差异的概念。