随机的

Since in some instance, the variance of response variable might be changeable along withthe alteration of explanatory variable, in the procedure of model constructing, a fixedeffects model should be considered firstly, then the random effects model or randomcoefficient model when necessary. The best fit model should be chosen by comparing thealterations of between-study variance and residual variance, as well as their relationshipswith covariates.

基于各研究中因变量与自变量间的曲线形状可能存在较大差异，建模时可依次考虑固定效应模型、随机效应模型和带协变量的随机系数模型，并观察研究水平的方差与残差方差的变化，以及与协变量的关系，从而选择最优模型。

In order to solve the route search problem in stochastic Petri net, the feature of reliability is introduced into each transition, and suppose that the lifetime distribution of a transition obeys the Weibull distribution model, then a memorial stochastic Petri net with reliability whose elements can record a little information is proposed based on the ant colony optimization algorithm and features of the memorial stochastic Petri net.

为了解决随机Petri网的路径寻优问题，在变迁中引进了可靠性的特性，并假设变迁的寿命服从威布尔分布模型，然后根据蚁群算法和时间Petri网的特点提出了一种网络元素可以记录少量信息的带可靠性的记忆时间随机Petri网。

The relation between the parameter of ground motion and time is transformed into a pure random process with the amplitude varying with time. Based on the concept that there is the scaling invariant fractal structure in the transmission of earthquake motion and the self-affinity of the ground motion signal in time domain, an assumption is deduced that the curve of the stationary random noise of the ground motion varying with time is a fractal graph.

将一个运动参数的时间变化过程转化为具有时变振幅的一个纯随机振荡问题，运用地震运动传递具有无特征尺度的分形结构和地运动时域信号具有统计自相似性的概念，提出地面运动随机平稳噪声的时变曲线是一条分形曲线的假设。

The approximate solution to FPK equation isobtained. The joint probability density function and stationary mean out-crossing rateare investigated for ship nonlinear rolling subjected to additive white noise excitation.Melnikov function and phase space flux are applied to analyze highly nonlinear rolland capsizing of ships in the random seas. The variation of phase space flux withrespect to the characteristic wave period, significant wave height and damping ofships is studied.

求FPK方程近似解，研究白噪声激励下船舶非线性横摇运动的联合概率密度函数及稳定期望穿阈率，应用Melnikov函数和相空间转移率研究船舶在随机波浪中的强非线性横摇运动及其倾覆问题，考虑波浪特征周期、有义波高及船舶阻尼特性的变化规律，推导了船舶在随机横浪中的极限波高的表达式。

As for the establishment of stochastic input-output models and the derivation of related theories, there are three points to be mentioned: firstly, the theoretical basis on which the ultimate requirements must comply with the index movement is given; secondly, the output control model is offered, which is based on the idea that the ultimate requirement is an index stochastic variable.

在随机投入产出模型的建立和相关理论的导出方面。一是给出了最终需求量服从指数分布的理论依据；二是提出了基于最终需求为指数型随机变量的产出量的控制模型。

Especially, the stochastic variable was introduced to the model to represent the phenomena of the stochastic extinction and recolony of the cocal population, that is one of the typical feature of the metapopulation.

这是一个离散的动力系统。利用动力系统稳定性和数值分析的方法，分析了种群变化的动态规律及其原因。其次，通过引进随机变量，很好地描述局域种群的灭绝和繁殖的随机现象。

The probability of failure of uncertain structures with stochastically varying properties subjected to dynamic random loads is studied.

对受有动态随机载荷的含有随机参数的不确定结构的失败概率或可靠度进行了研究，使之在工程实际中固有的结构参数的不确定性以及其对结构响应和可靠性的影响进行了评价。

METHODS The styptic pincers after being used were randomly divided into two groups : one group was washed with an half-automatic cleansing machine with 1:250 jieli enzyme being used , while the other group washed with a fully-automatic sterilizing machine with 1:2000 Anbijie polyenzyme detergent being applied.

取使用后的止血钳随机分成两组，一组采用半自动清洗机加入1：250的杰力酶；另一组采用全自动清洗消毒机加入1：2000的安必洁多酶清洗剂，均按操作常规进行清洗；随机从3d的清洗狂内抽样200把，进行常规目测，在目测的基础上再进行残留血污检测。

The necessary condition of an important result of the probability that the supremum of a random walk with heavy-tailed increments crosses a curve on a random time interval is presented by using an important property of a general distribution class.

利用一类常见分布族的一个重要性质，给出了增量带重尾分布的随机游动在随机时段内的上确界超越曲线边界的概率的一个重要结果的必要条件。

Second, compared with direct tensor product in multi-dimensional space, which suffers from the exponential increase of the number of sampling points with the number of variables, the Sparse Grid technique decreases the number of collocation points dramatically while the accuracy is guaranteed, and further reduces the computational complexity.

其次，为了避免通常用于多维空间的直接张量积随机配置法所带来的采点数随空间维度指数增长的缺点，采用稀疏网格采点技术，在保证建模精度的同时大幅度减少了配置点数目，从而进一步降低了随机配置法的计算复杂度。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。