Meanwhile , using the tools based on probability theories and mathematical statistics , the paper measures the market risks lying in the animal husbandry of hebei , so as to determine the probability density function of the losses from market risks of domestic animal products in this province 同时，对于河北省畜牧业生产经营所面临的市场风险，采用了概率论和数理统计的工具进行了度量，确定了河北省畜产品市场风险的概率密度函数。本文还探讨了畜牧业风险防范措施和现代风险管理措施。
The scheme is on the basis of the heterogeneity of soil water content ' s horizontal spatial distribution in the region and the evaporative power of relatively saturated region . if the probability density function ( pdf ) of soil water content ' s horizontal spatial distribution and the evaporative power of relatively saturated region are attainable , the mean evapotranspiration flux of the region can be calculated 该方案以区域内土壤水分在水平空间上分布的非均匀性和相对饱和区地表蒸发力为基础，在已知土壤水分水平空间分布律的概率密度函数( pdf )和饱和区地表蒸发力的前提下，实现区域平均蒸发散量的计算。
Abstract : based on the study of strength degradation of material in the fatigue process , a strength degradation model is proposed . a stochastic differential equation , which controls strength degradation , is obtained from the model randomized by markov process . by using the theory of stochastic , the distributions of residual strength at any given lifetime and lifetime of any given residual strength are attained . under a few suitable hypotheses , inverse gaussian distribution of fatigue life is derived , and verified by means of experimental data . the result shows that the model and the method are reasonable 文摘:在研究疲劳过程中材料强度退化规律的基础上,建立了一个强度退化模型.对其进行随机化处理,得到控制强度退化过程的随机微分方程.在一定假设条件下,获得了剩余强度概率密度函数的封闭解,并推导出疲劳寿命的反高斯分布形式.给出一种考虑损伤状态对随机涨落影响的近似处理方法.与试验数据的比较结果表明,本文的模型和方法是合理的
2 ) tansformed the real part and imaginary part of interferogram to stationary wavelet domain , analyzed the pdf of signal and noise wavelet coefficients using pearson distribution system , then evaluated the wavelet coefficients of signal in stationary wavelet domain by maximum a posterior ( map ) criteria to reconstruct the interferogram 2 )将干涉图的实部和虚部分解到静态小波域，用pearson分布系作近似，分析了信号和噪声小波系数的概率密度函数，在静态小波域用map准则估计信号的小波系数用于干涉图的重建。
From the order statistics models of system failure probability as well as the form of the probability density function of order statistics itself , it can be deduced that the system failure dependence called " common cause failure " can be well reflected through the load distribution and the strength distribution 从所建立的次序统计量模型及次序统计量的概率密度函数本身的形式可以推论，共因失效这种失效相关性完全可以通过载荷分布与强度分布这两种基本参量反映出来。
At present , it is mainly used in the fields of pattern recognition , regression and probability density function estimation , etc . fault diagnosis is part of pattern recognition issues , in this essay , svm is applied to establish two - fault classifier and multi - fault classifier of materials , and the multi - variety algorithm of svm is also discussed 支持向量机目前主要用于模式识别、回归估计、概率密度函数估计等方面,故障诊断属于模式识别问题。本文将支持向量机用于故障诊断,建立了两类分类器和多类分类器,讨论了支持向量机的多类分类算法,并与神经网络的分类方法做了对比,通过实例探讨了支持向量机在故障诊断方面的有效性。
In the traditional reliability model , the probability density function of random variable is important . so , in chapter 2 , the methods to get probability density function of engineering random variable are discussed . three methods , which include approximate method , monte - carlo simulation method and multiple parameter method , are compared by some examples . in chapter 3 , some non - probabilistic reliability models are discussed 在传统的概率可靠性模型中，变量的概率密度函数的确定非常重要，因此在本文第二章中，主要着力讨论工程随机变量概率密度函数的求解方法，说明原理，推导求解公式，并通过实际算例对近似解析法、 monte - carlo数字模拟法、多参数法三种方法进行对比。
