查询词典 density function

Natality, mortality and population The nature of competition (I1) growth (H2) The nature of predation (J1) Density and density

出生率，死亡率和种群增长(H2)竞争的性质(I1)密度和密度制约(H3)捕食的性质(J1)种群动态——波动，周期和混沌H4

Furthermore, the kernel density estimation, a nonparametric method, is used to estimate the density functions of natural logarithm of average cost per stay and average days of inpatient.

此外，本文将非参数模型中的核密度估计方法应用于每次住院费用对数和每次住院天数对数的分布研究中，并用它进一步估计了每次住院费用和每次住院天数的均值和方差，取得了较好的效果。

The results show that the color of the dyeing PET filament fabric is invariable with different fabric structure and different looming density of weft, but the lightness and saturation is changed to some extent, and they are both decreased with the looming weft density increasing, the variation showing negative exponent relationship.

结果表明：不同的织物组织和不同的上机纬密，着色涤纶长丝织物的色相不变，但其明度L和饱和度C均有不同程度的改变，且随着上机纬密的增加，着色涤纶加弹长丝织物的明度L和饱和度C均呈下降趋势，其变化关系表现为负指数关系。

The pore size decreases while the thickness and charge density increase with the increase of monomer concentration. the pore size of Na_2SO_4 rejection ranges negligibly when reaction time prolongs, while thickness and charge density increase.

考察了中空纤维纳滤膜对不同浓度的NaCl溶液的分离性能，结果表明复合膜对NaCl的截留率和通量都随盐溶液的浓度增加而降低。

Basing on the future of fractal,this paper introduces the density analysis method and points out the defects of existing feature selection method based on fractal dimension.Then a feature selection method based on fractal and changes of neighborhood space density is proposed.

根据数据集的分形特征，引入了密度分析方法，指出了当前基于分形维数的属性选择方法的不足，提出了一种基于分形和邻接空间密度变化的属性选择方法。

objective:to explore the clinical value of digital mammography on diagnosis of small breast cancer.methods:we retrospectively analyzed the representation of molybdenum target x-ray in 40 patients with small breast cancer diagnosed by biopsy.result:the molybdenum target x-ray showed nodosity tumor in 17 cases,calcification in 13 cases,density in 8 cases,focal grand architectural distortion in 6 case,single dilated in 3 cases and blood vessel line thickening in 6 case.conclusions:digital mammography is the most important means in the diagnosis of small breast cancer,which can distinguish between different kinds of breast density of different tissues and find small breast lump.the mammography has a high sensitivity in the diagnosis of small breast cancer.

目的：提高对小乳癌影像学的认识。方法：回顾性分析40例经病理证实的小乳癌患者的x线片。结果：x线表现为肿块17例，钙化13例，致密影8例，局部结构紊乱6例，单支导管扩张3例，血管影增多、增粗6例。结论：影像学是小乳癌诊断的最主要手段，能区别乳房各种不同组织的不同密度，能发现较小的乳腺肿块，对于乳腺癌的诊断，乳腺x线钼靶摄片具有较高的灵敏度。

Considering a predator-prey system with a kind functional reaction in which the predator species have no density restriction,no fishing,while the prey species have nonlinear density restriction and the constant invest.

考虑捕食者无密度制约、无捕捞，而食饵具有非线性密度制约和常投放率的一类功能性反应的食饵捕食系统，对其进行了定性分析，证明了在不稳定的正平衡点附近存在唯一的极限环。

As the most effective and powerful nonparametric density estimation technique,Kernel Density Estimation has been widely analyzed.

作为当前最先进有效的密度估计算法，核密度估计得到了广泛的研究。

One problem which should be solved is how to determine window width when theories and methods of nonparametric kernel density are employed to simulate stand structures,which is also the core of applying the nonparametric kernel density estimation in practice and directly related to simulation precision.

应用非参数核密度估计理论和方法，对林分结构进行模拟中，一个必须解决的问题就是窗宽的确定，这也是非参数核密度估计在实际应用中的核心问题，它直接影响模拟精度。

We find that the behaviors of charge density wave parameter and spin density wave parameter of nonperiodic Hubbard model are similar with behaviors in periodic Hubard model, and the distribution of.

本文对一维非周期的赫伯德模型和非周期的横场中量子伊辛链的量子相变和量子纠缠以及保真度进行了系统的研究。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。