速度函数

Because the coupling condition of NNGFM arises from the net current continuity imposed at the volume element interfaces, the relatively complex conversion formulation for partial current continuity condition of NGFM is unnecessary when applying G. E. T., and computation time is saved. The coefficient matrix of the coupled equations is tridiagonal, so it can be solved by forward elimination and backward substitution method.

NNGFM的基准校验及在大庆200MW核供热堆(NHR-200)上的应用表明，NNGFM计算精度和速度与第三类边界条件格林函数节块法NGFM〓相当，在相同精度下速度比CITATION能快1000倍；NNGFM给出的本征值、功率分布较NNGFM误差能减少一半以上，为更精确计算工作期、卡棒当量提供了条件。

Boundary value problems in classical hydrodynamics are usually transformed from the physical plane to velocity plane by hodograph method.

在古典水动力学中，对於二维、稳态、不可压缩、无旋流场且不考虑其他外力影响之平面射流问题，常用速度矢端图法将其由物理平面转换至速度平面，再以复变函数法求得平面射流问题之自由流线参数方程式，但其求解过程甚为繁复。

The algorithm optimizes the initial profile position to address effectively the impact of the initial location of the evolution curve speed,by through point by point to the generation of energy function for the minimal value,to reduce the amount of computation,improve the speed of image segmentation.

该算法优化了初始轮廓位置，有效地解决了初始位置影响曲线演化速度问题，并通过逐点代入法来极小化能量函数，减少了计算量，提高了图像分割的速度。

2The speed of creating random series used irrational fraction arithmetic was faster than that of multiplicative congruence arithmetic. The correlative value of random series almost was zero.(3) Regarding not harm the images quality as the premise, the speed of FM screening was heightened.

主要结论：利用所建立的条件半色调函数进行图像加网，操作简单、控制精确，使发生阶调不连续处的密度差平均减少到0.01275，明显改善了调幅加网印品的质量；(2)无理数取尾法产生随机数的速度快，数列间几乎没有相关性；(3)在不损失图像质量的前提下，提高了调频加网的输出速度。

The algorithm is based on simulated annealing algorithm and penalty function method .

提出了一种解水平轨道的列车节能控制问题的算法，该算法考虑了无限制速度和有限制速度两种情形，并基于模拟退火算法、动态罚函数法。

Because of the collective modulation of the periodic dielectric distribution to the incident electromagnetic waves, the directions of the group velocity and the phase velocity can be opposite, a photonic crystal slab can work as a negative refractive-index material.

由于介电函数的周期性分布对入射光的调制作用，使得特定频率区域的入射光在光子晶体中传播时的群速度方向和相速度方向相反，因而使得光子晶体平板表现出负折射特性。

Since the phase velocity and Q-factor both are functions of complex velocity, their values can be computed easily.

而复速度和品质因子又是复速度的函数，从而便可很容易的得出。

The result shows that the changing law of saliferous reservoir parameters is a nonlinear relationship with several variables, and it is a very complicated process.

研究结果表明，高含盐油藏储层参数变化呈多元非线性函数关系，变化规律复杂；渗透率变化存在临界值，大于临界值时，渗透率随着驱替速度、驱替量和含盐量的增加而增大，小于临界值时，渗透率随着驱替速度、驱替量和含盐量的增加而减小；注入水性质会对参数变化过程有影响，而对最终变化结果无影响；盐的溶解是储层参数变化的根本原因，岩石颗粒的脱落和运移是储层参数变化的直接原因。

As the choice of Neural Network will directly affect the detection data, BP based system is constructed by error reversion algorithm to train itself. It is simper and faster than other type of system.

由于系统所采用的神经网络的类型将直接影响数据检测结果的准确性，而BP神经网络是以误差反向传播算法对网络进行训练，其结构简单、收敛速度快；RBF 神经网络以简单变量的参数组合为函数来实现，具有训练速度比较快、性能比较好的特点。

The advantages of this new method are:(1) The field conductivity distribution function is fitter the actual condition than tradition methods:(2) On the condition of triangle elements cut of field, making the calculation speed increase in large degree than tradition methods.

与单元电导率重建算法相比，节点电导率重建算法的优点有：(1)使场域电导率分布函数更符合实际情况，克服了传统算法中对电导率作离散化处理的缺陷；(2)当场域采用三角形单元剖分方式时，在场域的剖分密度保持不变的情况下，可以大大提高重建计算的速度；(3)在场域采用三角形单元剖分方式时，场域的剖分密度可以比以前加大一倍，在不降低重建计算速度的前提下，可以改善重建计算的精度；(4)由于重建的是所有节点的电导率，避免了先前单元电导率重建图像中"阶梯"状边缘和"锯齿"状边缘的出现，明显地改善了图像的视觉效果。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。