出现概率

In addition, there will be bimodal distribution for time series if there is a linear trend, but it doesn't change the probability distribution of differences of scalars.

同时，也发现，线性趋势的存在会使原变量的概率分布出现双峰，但是不会影响变量差的概率分布。

In the single crystal of C60 with a FCC structure,positron mainly appears outside the C60 molecule.The main annihilation space is the interspace between molecules.The calculated positron bulk lifetime in C60 is 352ps, which agrees with experiment value of 356ps in literature.In carbon nanotube bundles with different dimeters,as the diameter of carbon nanotubes increases,the main space where positron appears changes from the interspace of carbon tubes to the space inside carbon tubes,the radio between positron annihilation with valence eletrons and core eletrons becomes larger,the positron bulk lifetime in carbon nanotube increase rapidly first and come to be a constant at the end.The calculated positron lifetime of carbon nanotube with a dimeter of 0.8～1.6ns is 332～470ps,which agrees with the experiment value of 394ps.Positron annihilation has been studied in widly used compound semiconductors.

计算结果表明：在片层结构的石墨晶体中，正电子主要在石墨层间的空隙中湮没，计算出的石墨中的正电子寿命为208 pS，与文献中的实验结果215 ps符合很好；在金刚石单晶中，正电子主要在碳原子之间的空隙中存在并发生湮没，计算出的金刚石中的正电子寿命为115 ps，文献中的实验结果110 ps左右符合；在面心立方结构的C60晶体中，正电子主要在C60分子球壳内外侧及分子之间存在，C60球形分子中心正电子分布很少，正电子的湮没区域集中在C60分子之间的空隙区域，计算出的C60中的正电子寿命为352 ps与文献中的实验结果356ps相符合；对于不同管径碳米管束中的正电子分布，随着碳纳米管直径的增加，碳纳米管束中的正电子由主要在碳纳米管管间的区域出现转变为主要在碳纳米管管内中心的区域出现：碳纳米管束中的正电子与碳原子的价电子的湮没概率变得越来越大，与核心电子的湮没概率变得越来越小；碳纳米管束中正电子的湮没寿命先迅速增大，而后趋于一定值。

This model adds a new stochastic slowing probabilities to reduce the over large probability of high and instantaneous acceleration in the FI model.

该模型在FI模型的基础上增加一个新的随机慢化概率，以减少FI模型中过大的瞬时加速度出现的概率。

Based on the guess probability and the misplay probability in the knowledge space theory, a new model is proposed which could effectively diagnose the knowledge states of students in that case.

本文提出了一种知识空间理论中基于猜测概率和失误概率的学习诊断模型，当受测者出现猜测或失误时，该模型仍可对受测者的知识状态进行有效的诊断。

The posterior probabilities give the probability of a particular state of nature, given a particular finding from the seismic survey.

后验概率给出了在特定的勘探结果下出现特定的自然状态的概率

To the question of non-Nash equilibrium in prisoners' dilemma, this paper makes an analysis to Game Theory's hypothesis: complete rationality, complete information and probability, and gets a result: systems thinking style in complete rationality, the happen of the event of zero probability, and the uncertainty that is brought out complete information is concordant beliefs, all can bring the appearance of non-Nash equilibrium, and the probability of appearance is decided by the proportion of men who think in systems thinking style.

本文就"囚徒困境"中非纳什均衡出现的，对博弈的前提假设完全理性、完全信息以及概率进行了，得出的结论是：完全理性中的整体思维方式和概率为零的事件的发生以及完全信息等于一致信念时引起的不确定性，都可能导致非纳什均衡出现，而其出现的可能性则取决于采取整体思维方式的人的比例。

The acquirement and expression of knowledge include two aspects: the first is that the spectrum knowledge of each land use type is automatically obtained from old land use map matched and overlain with remote sensing images; the other is that the changing knowledge of land use types are collected and analyzed, and changed into prior knowledge and probability.

二是通过对研究区各土地利用类型变化特点进行分析研究，并从中得到原有各土地利用类型经数年后变成其它类型的可能性及其大小。并将其定量化表达成新遥感图像上各类型的先验性概率。在知识的应用和分类方面，分别对原土地利用各类型所对应的遥感图像进行知识的应用和处理，利用各自可能出现的类型及其各类型的先验性概率进行最大似然法分类。

In this paper,an improved genetic algorithm is proposed to overcome the shortage of early convergence and stagnation in the traditional genetic algorithm,which is based on unconvertible rate of crossover operator and mutation operator.Moreover,the user page interest measure threshold is introduced into the association rules mining.

针对传统遗传算法在提取关联规则问题时常采用固定染色体交叉概率和染色体变异概率，容易出现早熟、收敛速度较慢的问题，提出了改进的遗传算法，并在关联规则的提取中增加了用户页面兴趣度这一阈值，成功地运用到某商业网站服务器日志挖掘。

The computation of posterior probability considers the evidence E certain without dealing with uncertain evidence,in terms of this,the posterior probability is split the difference according to the probability of evidence appearing in Bayesian network and its extension network of Credal network,and is expressed by Credal set so as to provide the base of decision-making for decision-maker.

任何变量的后验概率计算都假定证据变量E是确定的，无法处理不确定证据下的后验概率。针对这个问题，提出在贝叶斯网络及其扩展的Credal网络中应用证据出现的概率对后验概率进行折中处理，并用不确定的Credal集表达其结果，从一定程度上为决策人员提供有意义的决策依据。

The computation of posterior probability considers the evidence E certain without dealing with uncertain evidence,in terms of this,the posterior probability is split the difference according to the probability of evidence appearing in Bayesian network and its extension network of Credal network,and is expressed by Credal set so as to provide the base of decision-making for decision-maker.

中文摘要：任何变量的后验概率计算都假定证据变量E是确定的，无法处理不确定证据下的后验概率。针对这个问题，提出在贝叶斯网络及其扩展的Credal网络中应用证据出现的概率对后验概率进行折中处理，并用不确定的Credal集表达其结果，从一定程度上为决策人员提供有意义的决策依据。

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。