查询词典 probability density function

An ''impossible'' event has a probability of exactly 0, and a ''certain'' event has a probability of 1, but the converses are not always true: probability 0 events are not always impossible, nor probability 1 events certain.

但反推并不成立，也就是说机率值为0的事件不表示它就是一个'不可能'事件，同理，机率值为1的事件不表示它就一定发生。

In the meantime, a new relation between the coefficient of variation for a normal variate and its sample size is achieved, where the probability to make mistake Ⅱ is considered 5 The probability distribution of fatigue strength at given life under large sample size determined by a new method is found to follow the log-normal distribution and normal distribution, and a new method are developed to estimate the characteristic parameters of probability distribution of fatigue strength from the probability distribution of traditional tensile properties.

根据P-S-N曲线的要求，采用概率统计方法，导出了考虑犯Ⅱ类错误的概率时获取给定精度P-S-N曲线所需的最少子样容量，引入了不同方法获取的P-S-N曲线结果是否趋同的判别标准，得到了P-S-N曲线的寿命求解法和系数求解法获得趋同结果的条件。 5）研究了大子样条件下指定寿命时疲劳强度的概率分布，并提出了根据拉伸性能的分布估算材料疲劳强度概率分布参数的一种方法。

This paper introduced the appliance of probability and statistics in reality,including classical model,formula of total probability, normal distribute,mathematics expectation and the central limit theorem.While it also discusses the widely uses of probability and statistics and the close relationship with the real life.Therefore,it lays the theoretical foundation for the practical uses with probability and statistics,and the basis of mathematics model.

本文介绍了概率统计的某些知识在实际问题中的应用，主要围绕古典概型，全概率公式，正态分布，数学期望，极限定理等有关知识，探讨概率统计知识在实际生活中的广泛应用，进一步揭示概率统计与实际生活的密切联系，为应用概率知识解决实际问题，数学模型的建立，学科知识的迁移奠定一定的理论基础。

Proper combinations of number of outcomes, discrete step size, and scaling of the random variable, the discrete cumulate percentage distribution and discrete percentage density will converge to the continuous cumulative probability distribution and probability density function respectively.

适当之出现或试验次数或取样数量、散化阶梯大小、随机变数缩放比例可使离散累积百分比分布及离散百分比密度趋近于连续的累积机率分布及机率密度函数。

Comparison the in vivo activity of 90％EtOH fraction and compound 21 with estradiol, indicated the 90％EtOH fraction behaved the stronger activity on total mineral content, total density, trabecular mineral content, trabecular density and the anti-twist strength of the proximal tibia in OVX rat than estradiol, but compound 21 displayed the weaker activity on total mineral content, total mineral density, trabecular mineral density, cortical mineral content, cortical mineral density, cortical thickness and the anti-twist strength of the proximal tibia than estradiol.

通过90％乙醇部位及化合物21都与阳性对照药雌二醇的纵向比较后，在大鼠OVX模型中，90％乙醇部位高剂量组在提高全骨的骨矿含量和骨密度、松质骨的骨矿含量和骨密度及骨的抗扭力方面，作用强于阳性对照组雌激素类化合物，化合物21在小鼠OVX模型中，抑制了全骨的骨矿含量、骨密度和全骨断面面积的降低，松质骨骨密度的降低，皮质骨的外膜周长的增长，皮质骨骨矿含量量、皮质骨厚度和皮质骨密度的下降及抗扭力的减弱。

The results show that there is a linear correlation between magnetic susceptibility and density. Take 1.6 g/cm^3 as a boundary value, the magnetism of high density coal and low density coal was opposite. The diamagnetism property of low density coal weakens and the paramagnetism of high density coal enhances along with the size reduction of fine coal. The magnetic field intensity influences the magnetism of coal.

研究表明：比磁化率同密度间存在线性相关关系，以1.6 g/立方公分为界，高、低密度级煤分别呈顺磁性和逆磁性，且随煤粉粒度的减小，低密度级煤的逆磁性减弱，而高密度级煤的顺磁性增强；磁场强度对煤的磁性有一定影响。

The minimum oxygen density of liquid vapors of decalin that is extensive used in textile industry in different temperature and density. The effect of different temperature and density to minimum oxygen density is analyzed. The value of experimental determination is compared with theoretical value and the changing regularity of minimum oxygen density is discussed.

2以纺织过程中广泛使用的保护剂十氢萘为例，在不同温度、不同浓度下测定了其液体蒸气的最小氧浓度，分析了温度、浓度对最小氧浓度的影响，并通过理论值与实验测定值的比较，初步探讨了最小氧浓度的变化规律。

Soil available N was positively correlated with spore density of Salvia miltiorrhiza and Dioscorea opposite, and hyphal and total percent colonization of Adenophora borealis, while negatively correlated with arbuscular colonization of Aster tataricus; Soil available P exhibited a positive correlation with arbuscular colonization of Salvia miltiorrhiza and vesicular colonization of Dioscorea opposite, while a negative correlation with spore density of Platycodon grandiflorus and vesicular colonization of Atractylodes macrocephala; Spore density of Bupleurum Chinense had a positive affection with soil organic matter; Soil pH was negatively correlated with hyphal and total colonization of Adenophora borealis and spore density of Bupleurum chinense, while positively correlated with spore density of Adenophora borealis.

土壤碱解N与丹参和麻山药的孢子密度、北沙参菌丝定殖率和总定殖率呈显著正相关，与紫苑丛枝定殖率呈显著负相关。土壤速效P与丹参丛枝定殖率、麻山药泡囊定殖率呈显著正相关，与桔梗孢子密度、白术泡囊定殖率呈显著负相关。土壤有机质与北柴胡孢子密度呈显著负相关。土坡pH与北沙参菌丝定殖率和总定殖率、北柴胡孢子密度呈显著负相关，与北沙参孢子密度呈显著正相关。

Test output film's site density usually tools of the trade is density gauge, the type of the current density gauge, it is not all the same features, but we use density gauge at least should have test film site density values and film dot value two things, and you must test a higher accuracy.

尝试输入胶片的实地密度值凡是搁置的东西不离是密度仪，长远密度仪的种类比力众，功用也不尽不异，但是我们所搁置的密度仪起码不该敷裕尝试胶片实地密度值和胶片网点百分比值两项功用，并且务必敷裕较矮的尝试精确度。

Test output film's site density usually tools of the trade is density gauge, the type of the current density gauge, it is not all the same features, but we use density gauge at least should have test film site density values and film dot value two things, and you must test a higher accuracy.

尝试输入胶片的实不天密度值凡是搁置的东西不离是密度仪，长远密度仪的种类比力众，功用也不尽不异，但是我们所搁置的密度仪起码不该敷裕尝试胶片实不天密度值和胶片网不面百分比值两项功用，并且务必敷裕较矮的尝试大略度。

Many will continue to choose to live in duality and in conflict.

许多人将继续选择活在二元对立性和冲突中。

I find that students of the University of Physical Education all wear sportswear at first sight.

我发现：体育大学的学生乍一看，都是穿运动衣，大家都一样