密度分布

不同授粉方式的花粉密度分布与结实效应研究

Distribution of Pollen Density and Seed Setting Efficacy Under Different Pollinating Methods

五种初始分布强流离子束的径向密度分布和晕离子的径向概率分布研究

Study of Ionic Radial Density and Probability Distribution of Halo Ion in Five Different Initial Distributions of High Intensity Ion Beam

TEACO2激光器输出光束的能量密度分布一般为平顶型分布。

Generally , the energy density distribution of a TEA CO_2 laser was flat-topped .

X射线光子在固体中空间密度分布的蒙特卡罗模拟计算软件

Calculation software of Monte Carlo simulation of spatial distribution of density of X-ray photons in solid

LiB化合物X射线衍射强度计算与晶胞中电子密度分布

XRD intensity calculation and electron density function of Lib compound

通过金薄膜厚度的选择实现了对GaAs纳米线的直径及密度分布在一定程度上的控制。

Diameters and densities of GaAs NWs can be controlled by Au film .

初步证实了TEACO2激光器输出光束的能量密度分布可以按厄米-高斯函数展开。

It was proven that the energy density distribution of a TEA CO_2 laser could be expanded in Hermit-Gauss functions .

本文利用RBF公式，计算了地球、金星、火星等类地行星际的大气密度分布及火星水汽的寿命。

We have also calculated the atmospheric density distributions of the Earth , Venus and Mars .

不同供电方式ESP极板电流密度分布研究

Research on distribution of current density on ESP collecting plate under different power supply conditions

态密度分布显示在Cu的d轨道和两个配位基的π轨道间存在强的交换相互作用；

There is a strong exchange interaction between the d type orbitals of the copper atom and the π orbitals of the two ligands .

从理论上分析了阴极材料密度分布对CsI/MCP反射式X射线光阴极量子效率的影响，制备了不同密度分布的CsI/MCP反射式X射线光阴极，通过实验测试，优化出了最佳密度分布结构。

The effect of density distribution of photocathode material on quantum efficiency was analyzed theoretically . Reflective X-ray photocathodes with different density distribution were prepared , and the optimum density distribution was obtained through experiment test .

给出了重建的层析图及密度分布图，对模拟重建的结果进行了讨论和误差分析，给出了平均重建误差，并对加型、乘型ART算法的重建结果进行了比较；

The reconstructed tomography figure and the distribution figure of the density are presented . The error of reconstruction result is been computed and discussed . The reconstruction result of adding type ART arithmetic is compared with the multiplying type ART arithmetic .

对人口分布模型的模拟则表明，上海人口分布虽然符合负指数函数模型，但不是最优模型，上海人口密度分布的最优模型是Cubic函数。

The result also indicates that Cubic model is the optimal one to describe population density distribution of Shanghai both in 1990 and 2000 , and the exponential model is not the best .

本文通过利用matlab编程，完成了一个有机太阳能电池理论模型的数值模拟，它可以清晰的展示出器件的电流电压特性、载流子密度分布等。

This paper complete a numerical simulation of the theoretical model of an organic solar cell by using matlab , and it can be clearly demonstrated the current-voltage characteristics of the device , the carrier density distribution and so on .

通过分析分数阶Fourier变换功率谱与信号相位微分的关系，提出了根据信号密度分布和分数阶Fourier谱估计信号瞬时频率的方法。

The relationship between the fractional Fourier power spectrum and signal 's phase differentiation operation are considered . A novel method for solving the instantaneous frequency estimation problem from only intensity distributions and the fractional Fourier spectrum is proposed .

一般来说，重建算法总是将连续的密度分布离散化为像素，且认为每个像素的密度分布均匀，它的正电子发射是空间Poisson过程。

In reconstruction practice , we have to discrete density distribution into pixels . The isotopy distribution is uniformly through the whole pixel , and it emits positron follow a space Poisson point process .

对于每一个被检测出的目标，计算灰度和局部标准差的分布，通过计算MeanShift向量，最小化当前帧目标与模板的核密度分布，实现对目标的跟踪。

For each detected target , distributions of intensity and local standard deviation are computed , and tracking is performed by computing the Mean Shift vector that minimizes the distance between the kernel density distribution of the target in the current frame and the template .

利用Nissl染色和计算机图像处理的方法，研究了30日龄北京鸭（P30）视网膜节细胞层（Ganglioncelllayer，GCL）细胞的形态大小、数量和密度分布。

The density and size of the cells in the ganglion cell layer ( GCL ) were studied using Nissl-staining in the retina of Beijing duck ( posthatching day 30 , P30 ) .

本文分析了AED极轨卫星近地点的变化及其相应的大气膨胀和密度分布情况。

In this paper , variations of AE-D 's perigee altitudes , the corresponding atmospheric expansion and the density distributions are analyzed .

本文根据London超导理论，并结合Anderson磁通热激话理论讨论了该课题，给出了Slab样品中的电场、电流和磁通密度分布，定量解释了实验观察到的现象。

In this article , we deal with this subject based on London ′ s theory and Anderson ′ s flux motion model , and illustrate the electrical field distribution , current density and magnetic field distribution in the sample .

PF-MDF剖面密度分布特征的研究

Density Profile Resulting from Processing Variables and Quality of PF-MDF

算法利用Radon变换对图像进行主纹理方向分析，得到图像的局部纹理方向概率密度分布，然后基于概率统计模型，借助中心像素的若干邻近像素对中心像素进行估计，得到中心像素点的灰度值。

The proposed algorithm utilizes Radon transform to determine texture direction probability density distribution of local areas of images , and then applies probability statistic model to estimate the middle pixel 's gray value according to its neighbour pixels .

在得到冬小麦一维根长密度分布函数基础上，建立了改进的Feddes冬小麦根系吸水模型；

Based on the winter wheat root density function set up mended Feddes wheat root water uptake model ;

RAS-RMF理论计算获得的原子核质量密度分布清晰地展现出偶偶核Xe、Ba，Ce同位素链的形状演化过程，与计算得到的形变参数变化规律及实验结果相一致。

In particular , RAS-RMF theory provides the quality densities which show clearly the shape evolution of these nuclei . This is in accordance with the variation for parameters of deformations and the experimental observation .

实验表明，随着聚合MDI中三环化合物含量的增加，聚合MDI发泡的高度指数升高、密度分布系数下降，改善了聚合MDI的发泡流动性；

The results showed that with the growth of 3-ring MDI isomer content , foaming height exponent of polymeric MDI would rise and foam density distribution coefficient would decline respectively , its foaming flowability was improved markedly .

由巨势最小原理确定Lennard-Jones（LJ）流体在狭缝中的密度分布和过剩吸附量，所得结果与分子模拟数据吻合良好。

The density profiles and the excess adsorption for Lennard-Jones ( LJ ) fluid inside slit pores were determined by minimizing the grand potential and the results agreed well with the simulation data .

利用燃料电池电流密度分布测量垫片对PEM燃料电池的电流密度分布进行了测量，分析了氢气流量和空气流量对其性能的影响。

In this paper , the current density distribution in PEM fuel cell is measured using the fuel cell current density measurement gasket , and the effects of the air and hydrogen flow rate on PEM fuel cell performance are analyzed .

为提高高超声速条件下飞行器表面热环境的计算精度，发展了高精度算法WCNS-E-5，并开展了热流密度分布的数值计算研究。

The high-order algorithm of WCNS-E-5 is developed in this paper to improve the calculational accuracy when the aerodynamic heating predictions over hypersonic vehicles are needed .

本文用化学分析方法研究了在固定的电流强度50A，不同的放电深度（100%，50%，20%）放电后椭圆形密封铅酸蓄电池正极板的电流密度分布。

This paper studies the electrical distribution on positive electrode surface of sealed lead - acid battery when the electrical current intensity is 50A and the discharge depth is 100 % , 50 % and 20 % respectively .

该算法充分挖掘must-link和cannot-link约束集中所包含的信息，用来提取反映数据集密度分布的不同的Eps参数值，从而发现不同密度的簇。

The algorithm extracts useful information from the must-link and cannot-link constraint sets sufficiently . Then , it picks up the parameter values which can reflect the density distribution of dataset . So it can find the cluster structures of different densities .