查询词典 exterior approximation

The experimental results show that the proposed ACA with the roulette wheel selection can obtain better performance than that generated by the conventional polygonal approximation methods.

实验结果显示，我们所提出的ACA方法以轮盘的赌轮选择，比传统多边形逼近法可获得更好的表现。

New algorithms and design strategies greatly imp- rove the XXX87's performance, lots of instructions can be finished in a few clock cycles. Newton-Raphson and Polynomial approximation are used to implement division, square root, and elementary functions.

特点是结合牛顿-拉夫逊迭代算法，采用多项式逼近法对初等函数、除法和平方根进行实现，既有效地利用XXX87片内的浮点加法单元和阵列乘法器，又避免了查找表的使用。

Calculations on the basis of the self-consistent approximation are used to study the effects of slit cracks, elliptical cracks and penny-shaped cracks. The influence of slit cracks on the elastic moduli under all kinds of loading conditions is discussed by Betti's reciprocal theorem and Irwin's relation describing the released energy rate of fracture to the stress intensity factors. The friction between the cracks' surfaces is taken into account for the closed cracks.

采用自恰方法研究了狭长型，椭圆型及硬币型裂纹在荷载作用下对弹性常数的影响；采用Betti的互易定理以及lrwin关于断裂能量释放率与应力强度因子的关系，分析了狭长型裂纹在各种应力状态下对弹性常数的影响；分析研究了裂纹闭合时，由于裂纹面上摩擦力的存在，闭合裂纹时弹性常数的影响。

And we prove that this new interpolating subdivision scheme from approximation scheme can be C1 continuous at least.

并证明，这种新的由逼近推导得到插值细分方法可以使得到的细分方法是C1连续的

After the deduction of high order temporal and special difference approximation to the wave equation, the snapshots of wave propagation in an infinite monoclinic media and synthetic three components surface and VSP data for a flat layered model are presented.

推导了交错网格中时间和空间上的高阶差分近似公式，并针对二维单斜各向异性介质，给出了具体的空间差分网格的形式。在上述理论的基础上，利用交错网格高阶有限差分技术，首次对单斜各向异性介质中波的传播特性进行了模拟。

The results suggest that the electron density of the interface between GP zone and the matrix is coherent under the first order approximation, thus particles of GP zone are prone to growing, while β phase is not coherent, which will restrain recrystalization particles of β phase from growing, however β phase is coherent to enhance resistance to deformation of the alloy under high stress.

结果表明：Al-Mg-Si合金GP区与基体界面电子密度在一级近似下连续，GP区粒子易于长大，而β相不连续，抑制了β相再结晶晶粒的长大，但它在高应力下呈现连续，从而提高合金变形抗力。

There are few equivalent circuit modeling methods for UWB antennas. This thesis compares the characteristic of some existing modeling methods and presents a general and precise modeling method for UWB antennas. Firstly, establish the narrowband model of the antenna, and compute the difference between input admittances of the antenna and its narrowband model. Secondly, implement rational approximation of the difference to build the macromodel, and convert it into SPICE equivalent circuits. Lastly, combine the narrowband model and the macromodel to form the ultimate equivalent circuit model of the antenna.

本论文针对目前UWB天线等效电路建模方法比较少的现状，结合现有的天线建模方法的一些特点，研究了一种系统通用、模型精度高的新建模方法：首先建立超宽带天线的窄带模型，计算天线及其窄带模型导纳的差值；接着对差值进行有理多项式拟合，得到相应的宏模型，并转化为SPICE等效电路；最后合并窄带模型与宏模型电路，得到天线等效电路模型。

18 Has revealed that the approximation of the vocal folds during phonation caused the vocal muscles to be twisted as shown in Fig.

Sonesson (1960)假设这种肌肉扭转提供声带在发声时坚固及张力，因此可以稳定音高及音量。

When the electron interaction, as present in the PPP Hamiltonian, is included even at the level of mean field approximation, the accidental degeneracies in the energy bands of CNTs satisfying the condition, mod(m-n, 3)=0, are removed completely except armchair CNTs.

如果将电子作用力纳入考量，即使只用平均场近似，在奈米碳管能带中满足mod(m-n，3)=0之偶然简并将会消失，唯有扶手型奈米碳管得以豁免。

Based on Valley's quasi-cw approximation, the writing and erasing of gratings in materials exhibiting bulk photovoltaic effect on illumination with short light pulses is investigated.

利用G.C.Valley的准连续光近似模型，研究了短脉冲激光在光伏光折变材料LiNbO3晶体中写入和擦除光折变光栅的过程，给出了空间电荷场随时间变化的表达式。

Now she was hungry and angry.She began to smoulder.

现在她又饿又气，她开始流露难以抑制的怒火。

You have placed our iniquities before You, Our secret sins in the light of Your presence.

诗90：8 你将我们的罪孽摆在你面前、将我们的隐恶摆在你面光之中。