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71.
张世昌 《电子科技大学学报(社会科学版)》1988,(3)
本文对低导引场无波荡器自由电子激光进行了非线性数值计算分析。结果表明,这种自由电子激光工作在毫米波段时,电子束在纵向及横向均有净动能交给信号波,具有很高的互作用效率(32%);而且,腔体长度较短,腔体直径较大,易于加工制作。 相似文献
72.
任晓 《西昌学院学报(社会科学版)》2004,16(2):98-101
本文介绍了一类关于极大,η-单调映象的完全广义拟变分包含问题,利用预解算子技巧研究了这类变分包含解的迭代算逼近,证明了解的存在性以及由算法生成的迭代序列的收敛性。 相似文献
73.
Sven Knoth 《Statistics and Computing》2005,15(4):341-352
Originally, the exponentially weighted moving average (EWMA) control chart was developed for detecting changes in the process mean. The average run length (ARL) became the most popular performance measure for schemes with this objective. When monitoring the mean of independent and normally distributed observations the ARL can be determined with high precision. Nowadays, EWMA control charts are also used for monitoring the variance. Charts based on the sample variance S2 are an appropriate choice. The usage of ARL evaluation techniques known from mean monitoring charts, however, is difficult. The most accurate method—solving a Fredholm integral equation with the Nyström method—fails due to an improper kernel in the case of chi-squared distributions. Here, we exploit the collocation method and the product Nyström method. These methods are compared to Markov chain based approaches. We see that collocation leads to higher accuracy than currently established methods. 相似文献
74.
俄罗斯12年经济体制转轨的分析与思考 总被引:1,自引:0,他引:1
庄起善 《复旦学报(社会科学版)》2004,(4):37-47
20世纪90年代初开始的俄罗斯向市场经济转轨,一直为世人所关注.12年来,俄罗斯走过了一段复杂的改革路程.本文在占有大量资料的基础上,对渐进式改革和激进式改革的成本和收益、俄罗斯选择激进式改革方案的原因、俄罗斯实施激进式改革方案的过程及其结果,以及普京上台后俄罗斯经济发展模式和经济政策的调整及其成效等问题进行系统的分析和论证,试图从中得出某些可资借鉴的经验和教训. 相似文献
75.
In this article, we introduce a new distribution-free Shewhart-type control chart that takes into account the location of a single order statistic of the test sample (such as the median) as well as the number of observations in that test sample that lie between the control limits. Exact formulae for the alarm rate, the run length distribution, and the average run length (ARL) are all derived. A key advantage of the chart is that, due to its nonparametric nature, the false alarm rate and in-control run length distribution are the same for all continuous process distributions, and so will be naturally robust. Tables are provided for the implementation of the chart for some typical ARL values and false alarm rates. The empirical study carried out reveals that the new chart is preferable from a robustness point of view in comparison to a classical Shewhart-type chart and also the nonparametric chart of Chakraborti et al. (2004). 相似文献
76.
Frederik Beaujean Allen Caldwell 《Journal of statistical planning and inference》2011,141(11):3437-3446
A new test statistic based on runs of weighted deviations is introduced. Its use for observations sampled from independent normal distributions is worked out in detail. It supplements the classic χ2 test which ignores the ordering of observations and provides additional sensitivity to local deviations from expectations. The exact distribution of the statistic in the non-parametric case is derived and an algorithm to compute p-values is presented. The computational complexity of the algorithm is derived employing a novel identity for integer partitions. 相似文献
77.
沈晓梅 《盐城工学院学报(社会科学版)》2003,16(2):65-66
高校存在着大学生助学贷款难这一现象 ,主要原因是大学生信用的缺失 ,因此必须对大学生加强信用教育。 相似文献
78.
基础教育的均衡发展 ,是契合时代特征的一种全新的教育理念和教育发展观 ,我们应站在战略的高度来认识基础教育均衡发展的重要意义。针对我国基础教育非均衡发展的现状 ,我们认为 ,政府对推进基础教育的均衡发展应负有主要的责任。 相似文献
79.
Jerome Saracco 《统计学通讯:理论与方法》2013,42(10):2367-2393
We consider the semiparametric regression model introduced by Li (1991) and add to this model some linear constraints on the slope parameters. These constraints can be identifiability conditions or they may carry additional in¬formations on the slope parameters. Using a geometric argument, we develop a method to estimate the slope parameters. This link-free and distribution-free method splits in two steps: the first is a Sliced Inverse Regression (SIR); Canonical Analysis is used at the second step to transform the SIR estimates so that they satisfy the constraints. We establish yn-consistency and obtain the asymptotic distribution of the estimates. This estimation method is applied to the general sample selection model which is very useful in Econometrics. A simulation study shows that the method performs well in the example considered. 相似文献
80.