一阶矩和二阶矩。
用一次二阶矩法分析结构可靠度需要反复迭代求解。
For structural reliability analysis calculation. Rackwitz and Fiessler Method has to employ iteration.
采用改进一次二阶矩法分析单个夹杂裂纹扩展的可靠性。
The reliability of the fatigue crack growth life of single inclusion is analyzed by the advanced first order and second moment method.
本文采用二阶矩两相湍流模型模拟了气泡-液体闭式多股射流。
The bubble-liquid two-phase jets are simulated using a second-order moment two-phase turbulence model.
波函数二阶矩的数值结果表明，绝大多数的电子态都是局域化的。
The numerical results for second moments of wave functions are shown, most states are localized ones.
在一次二阶矩法的基础上，推导了计算模糊随机可靠度的具体公式。
Study on Fuzzy Random Reliability of Existed Civil Buildings and Appraisal Program Designing;
利用一次二阶矩法，计算了一座八层配筋空心砖房屋的开裂和倒塌概率。
By using of the second-moment method the cracking and collapse probabilities of a hollow brick-wall building of 8 storey with consideration of elasticity of foundation are calculated.
在本文我们分析最小方差法存在的缺陷，提出了套期保值的最小二阶矩方法。
In this paper, we analysis the defects of least variance method, and advance a least second moment method of the futures hedging.
功率密度的二阶矩方法可用于截断光束，并克服了光束质量因子的发散困难。
It is also shown that the second-order moment method of the power density is applicable to the truncated beams and overcomes the divergence difficulty of the beam quality factor.
现有基本的结构可靠度计算方法可分为一次二阶矩法、蒙特卡罗法和响应面法。
The present usually reliability analysis method for engineering structures are Monte Carlo Simulate (MCS), First-order Second-moment method (FOSM) and reliability Surface method (RSM).
采用改进的一次二阶矩法对腐蚀管道的可靠性指标和失效概率进行了分析和计算。
The advanced first order and second moment iterative method are employed for calculation on reliability index and failure probability.
借鉴结构可靠度分析方法，给出了供水管网抗震功能可靠度分析的一次二阶矩方法。
The mean-value-first-order-second-moment method and advanced first-order-second-moment method are used to analyze the aseismatic serviceability of water supply network.
基于可靠度理论，本文采用一次二阶矩法(JC法)对疲劳裂纹扩展可靠性进行计算。
Based on reliability theory, the first order second moment method (JC method) is adopted to analyze and compute the fatigue reliability.
针对一次二阶矩法可靠度指标分析中验算点的计算问题，提出一种新的修正迭代算法。
A new iterative algorithm is presented for seeking the design point in the FOSM reliability index analysis.
考虑标准二维布朗运动在正象限锥形区域的占有时，得到其一阶矩和二阶矩的表达式。
The occupation time in a cone in the positive quadrant for a standard two-dimensional Brownian motion is studied, and its first and second moments are given explicitly.
根据提出的可靠度计算理论和方法，编制了基于一次二阶矩和JC法的可靠度计算程序。
Secondly, the procedure of tunnel lining based on First Order Second Moment(FOSM) and JC method is presented to calculate the reliability of tunnel lining.
探讨了在随机向量的一阶矩和二阶矩条件下，寻找补偿函数的期望值的一个上界的问题。
This paper inquires into the problem of finding an upper bound for the expectation of recourse function when only first and second moment constraints are available.
通过CCD成像方法对准直后的光束发散角进行了测量，利用二阶矩算法计算出光束发散角。
The divergence Angle of light beam was measured with the method of CCD imaging and computed by second moment method.
数据帧的等待传输时间（延迟）的均值和二阶矩是衡量一个实时通信网络的重要的性能参数。
The mean and second moment of frame's waiting time are important performance parameter for real time communication network.
本文将二阶矩两相湍流模型和颗粒动力学理论结合，提出了各向异性的二阶矩稠密两相湍流模型。
Finally an anisotropic two-phase turbulence model for dense gas-particle flows combining the usm model with the particle kinetic theory is proposed.
通过对模型中的参数进行模糊化处理，用改进一次二阶矩法计算了地下水过量开采的模糊风险率。
The parameters of the model are fuzzily processed and the fuzzy risk can be evaluated by using the modified first order second moment method.
简要介绍最大信息熵原理及其概率估计方法，推导出二阶矩意义下的最大熵概率密度分布表达式。
The maximum entropy principle method and the corresponding probability evaluation method are introduced, and the maximum entropy probability distribution expression is deduced in two degree moment.
本文将二阶矩两相湍流模型和颗粒动力学理论结合，提出了各向异性的二阶矩稠密两相湍流模型。
Finally, an anisotropic two-phase turbulence model for dense gas-particle flows, combining the USM model with the particle kinetic theory, is proposed.
由求解失效概率的改进一次二阶矩法出发，给出了失效概率对中间变量分布参数偏导数的计算公式；
On the basis of the advanced first order and second moment method, the partial derivatives of the failure probability to the distribution parameters of the process variables were formulated.
从颗粒运动的PDF(概率密度分布函数)输运方程出发建立颗粒相的质量、动量和脉动速度二阶矩方程。
Equations of mass, momentum and second moments for particulate phase are derived from a particle PDF (probability distribution function) equation in dilute turbulent sediment-laden flows.
通过应用高温构件蠕变损伤的随机方程及一次二阶矩理论和方法，对高温构件的概率寿命预测进行了研究。
The probabilistic life prediction of high temperature components was studied by using the stochastic equation of creep damage and simple second-order theory and method of high temperature components.
一次二阶矩法是目前求解结构可靠性分析的主要计算方法之一，该方法要求功能函数对随机变量的偏导运算。
Reliability analysis using First Order Second Moment (FOSM) is important for structural probability design, in which process demands the derivative operation.
作用在任意运动物体（系）上的力和力矩可以分别表示成流场中动力学涡量的一阶矩和二阶矩随时间的变化率。
The force and moment exerted on the solid body are expressed as the rate of change of the first-and second-order kinetic vorticity moments, respectively.
基于由Ditlevsen给出的广义可靠指标和一次二阶矩法，提出了一个简捷的结构可靠度计算方法。
Based on the generalized reliability index given by Ditlevsen and the first order second moment method, a simplifed calculating method on structural reliability is presented.
一次二阶矩方法是结构可靠度分析的基本方法．一次二阶矩方法的计算精度依赖于验算点附近功能函数的非线性程度。
The first-order second-moment method is fundamental in structural reliability analysis, its accuracy depends upon the nonlinear extent of performance functions around checking point.
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