分布系数

The reasons are that GM (1, 1) model groups have constant coefficient properties while their parameter distribution is"grey", so they can keep original system characteristics and reflect system reality.

这是因为灰色预测法所建模型具有常系数性质，但其参数分布是"灰"的，因此可保持原系统的特征，能较好地反映系统的实际情况，故建模的精度较高。

If the Landweber method and pre-iteration method were convergent, the residue sequence would be monotone decreasing. By analyzing the convergence, the fact is demonstrated that for the severe ill-conditioned matrix of sensitivity coefficient, because of the limitation of the precision of the computer, the residue sequence is not monotone decreasing; thereby the reconstruction images diverge from the true distribution of the conductivity. So the generalized inverse method with threshold is established and the selection way of the regularization parameter is presented, by which the better images are reconstructed.

Landweber法和预迭代法收敛，则其残差序列单调递减，通过对它们的收敛性进行分析，证实对于病态性严重的灵敏度系数矩阵，由于受计算精度的限制，迭代过程中的残差序列不再单调递减，从而导致重建图象偏离实际电导率分布，因此作者建立了带阈值的广义逆算法，提出了规则化参数选择方法，获得了较好的图象重建质量。

The surface temperature distribution,the spraying cooling curve,and the heat transfer coefficient of spray cooling were obtained.

得到了加热表面温度分布、喷雾冷却曲线和喷雾冷却的换热系数等传热特性。

The second group contained Longfeng and Dolgo, inheriting Chinese crab apple genes.

各品种的相似系数分布在0.14～0.83之间。

This paper studies the main geometrical parameter such as angle, height, width, stagger and the upper width in dentation and trapezoid flow path, firstly, uses the single-phase numerical simulation of the computational fluid dynamics technique to analyse the influence of different geometrical parameter on discharge coefficient and flow state exponent of drip emitter. Secondly, uses the two-phases numerical simulation of CFD (1% sand content ) to analyse the influence of the above mentioned geometrical parameter on the contribution regulation of sand and anti-clogging performance. Thirdly, uses the PIV （ particle Tracking Velocimetry ） technique which can see the small-scale flow path to observe and test the trajectories and velocities of solid particles in labyrinth flow path, and analyses the basic factors which can influence the movement characteristic of solid particles and the flow state in flow path.

本文以齿形流道、梯形流道为主要研究对象，以流道转角、流道高，流道宽、偏差量及梯形流道上底宽为主要结构参数，首先应用 CFD 单相流数值模拟技术对不同结构参数灌水器流道水力性能进行模拟，分析了不同结构参数对流态指数和流量系数的影响，其次，应用 CFD 两相流（含沙量为1%）数值模拟技术分析了结构参数对含沙量分布规律和抗堵塞性能的影响，然后，应用 PIV 可视化测试方法测试了固体颗粒在流道内运行轨迹及速度，分析了影响固体颗粒运动特性及流道内流体流态的基本因素，最后，对上述流道结构形式通过模具加工及滴灌带试制，进行了标准化测试（ GB/T 17187-1997 农业灌溉设备滴头技术规范和试验方法与 ISO 标准 ISO /TC23 /SC18 /WG5N4短周期堵塞测试程序），测试结果验证了 CFD 模拟结果，并提出了迷宫结构流道灌水器的抗堵塞设计方法。

In HgCdTe with low dislocation density, the main component is a Guassian like distribution and can be described by the Fick's law with a constant diffusion coefficient with a limited source as the boundary condition.

在缺陷密度比较低的碲镉汞材料中，砷扩散的主体符合恒定扩散系数的有限源扩散模型，呈现出浓度随深度的高斯分布。

Finally, according to the characteristic of wavelet coefficient distribution and human visual system, two improvements on this algorithm are presented .

最后，根据小波系数的分布特点和人眼的视觉特性，对该算法提出了两点改进。

At the same time, the trend of Kirie simplex is also confirmed by the distribution of tetrahedron coefficient.

同时，四面体系数的分布进一步证实Kirie单纯形的变化趋势。

The program can generate scale-free networks, and can calculate the distribution network and gather coefficient.

该程序可以生成无标度网络，并可以计算网络的度分布及聚集系数。

The main contents include:(1) Basic definitions of networks, including average path length, clustering coefficient, degree distribution, and etc.

主要教学内容包括：（1）基本概念，包括平均路径长度，聚类系数和度分布等。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。