Calculation of the bolt binging reliability based on improved linear second order moment 用改進的一次二階矩法求螺栓聯(lián)接的可靠度
second order moments model and numerical simulation of dense gas-solid two-phase flow 高濃度顆粒氣固兩相流動的二階矩模型的數(shù)值模擬
(3 ) towards the result of period estimation by the method called fluctuations of second order moments, we do some researches on period-searching, and find a basic method and another two universal methods 在該方法的基礎(chǔ)上,增加約束條件得到了兩種通用的周期搜索方法。另外,在周期同步方面,完成了一種在周期估計的基礎(chǔ)上進行數(shù)據(jù)切割的周期同步方法研究。
In the second chapter, basic theory about the mathematical statistics and the structural reliability in this paper . such as parameter estimation types of statistics distribution tests of distribution hypothesis methods of linear-second order moment, ect 數(shù)理統(tǒng)計學原理主要包括:參數(shù)估計、統(tǒng)計分布類型、分布擬合檢驗;工程結(jié)構(gòu)可靠度理論主要介紹了一次二階矩方法。
On the basis of building power function by the reliability theory, comparison and analysis of the two methods of losm ( linear second order moment ) are made on the solution to the power function, and check calculation is carried out on the slope reliability index 摘要在利用可靠度理論建立功能函數(shù)的基礎(chǔ)上,對功能函數(shù)的求解進行了一次二階矩兩種方法的比較與分析,并對邊坡的可靠指標進行了驗算。
Result shows, the uncertainty of parameter leads to negative ( positive ) investment horizon effects when investor's risk aversion is more ( less ) than that of logarithmic utility; the effects of parametric uncertainty will weaken when investor uses more past data in his estimation, or when his risk aversion increases; the effect of the first order moment's uncertainty is stronger than that of the second order moment's uncertainty 研究表明,當投資者的風險規(guī)避程度大于(小于)對數(shù)效用時,參數(shù)不確定性將導致負(正)的投資期效應(yīng);當投資者在估計過程中運用較多的歷史數(shù)據(jù)、或者風險規(guī)避程度增加時,參數(shù)不確定性的影響將減弱;收益一階矩的不確定性影響較其二階矩強。
Abstract : in this paper, we give the definitions of second order moment fuzzy stochastic process and its mean square convergence, and prove the cauchy criterion of mean square convergence of second order moment fuzzy stochastic process, and discuss the properties of mean square convergence of second order momnet fuzzy stochastic process 文摘:給出二階矩模糊隨機過程及其均方收斂的定義,證明二階矩模糊隨機過程均方收斂的柯西準則,討論二階矩模糊隨機過程均方收斂的性質(zhì)。
Abstract : in this paper, we give the definitions of second order moment fuzzy stochastic process and its mean square convergence, and prove the cauchy criterion of mean square convergence of second order moment fuzzy stochastic process, and discuss the properties of mean square convergence of second order momnet fuzzy stochastic process 文摘:給出二階矩模糊隨機過程及其均方收斂的定義,證明二階矩模糊隨機過程均方收斂的柯西準則,討論二階矩模糊隨機過程均方收斂的性質(zhì)。
In the end, the theory of fractal geometry is applied to the waves propagation and scattering in atmospheric turbulence, and the first and second order moments of the scattering fields are derived by considering the effects of the fractal atmospheric turbulence . the normalized back-scattering radar cross section of a perfectly conducting disk is calculated . the influence of fractal dimension of atmospheric turbulence on the radar cross section is analyzed 本文最后將分形理論引入到湍流大氣中的波傳播和散射領(lǐng)域,導出了分形大氣湍流中光滑導體目標散射場的一階矩和二階矩,以光滑導體圓盤為例研究了湍流大氣的分維對導體目標后向散射截面的影響。