多元分层抽样样本量的分配

本文给出了精度意义下多元分层随机抽样样本量的最优分配,证明了在不包含不合理分配的情况下,最优分配下多元分层随机抽样的精度最高,比例分配下多元分层随机抽样的精度其次,多元简单随机抽样的精度最低.     

两类几乎单群与斯坦诺5-设计

对两类几乎单群旗传递作用于斯坦诺5-设计上的情况进行了讨论,得到了:设D=(X,B,I)是非平凡的斯坦诺5-设计,D的自同构群G旗传递地作用在D上.若G是几乎单群,则Soc(G)不同构于单群HS(这里v=176)和CO3(这里v=276).     

素描中的艺术语言

对素描中艺术语言的探究,使素描概念有了更宽泛的外延.     

Estimation of bivariate characteristics using ranked set sampling

The superiority of ranked set sampling (RSS) over simple random sampling (SRS) for estimating the mean of a population is well known. This paper introduces and investigates a bivariate version of RSS for estimating the means of two characteristics simultaneously. It turns out that this technique is always superior to SRS and the usual univariate RSS of the same size. The performance of this procedure for a specific distribution can be evaluated using simulation or numerical computation. For the bivariate normal distribution, the efficiency of the procedure with respect to that of SRS is evaluated exactly for set size m = 2 and 3. The paper shows that the proposed estimator is more efficient than the regression RSS estimators proposed by Yu & Lam (1997) and Chen (2001). Real data that consist of heights and diameters of 399 trees are used to illustrate the procedure. The procedure can be generalized to the case of multiple characteristics.     

论春秋战国时期兵学中的朴素唯物辩证思想

春秋战国时期兵学中的朴素唯物辩证思想渊源于夏、商、周,这一时期出现的《军政》《军志》《令典》等兵书和集三代兵学思想之大成者姜望的思想中的朴素唯物辩证思想已开始萌芽。春秋战国时期出现的《孙子》《吴子》《孙膑兵法》《尉缭子》和《司马法》等兵书继承和发展了夏、商、周时期兵学中的朴素唯物辩证思想,展现出丰富的内容:一是依据战争中的客观因素及其矛盾去认识战争指导原则和发展规律,强调“知己知彼,百战不殆”;二是重视发挥人的主观能动性,强调在战争中要观形察势、因变治变;三是论述了战争中文与武、军事斗争与政治斗争之间的辩证关系,强调文德与武备并重、政略与战略结合等。这些朴素唯物辩证思想至今仍有现实指导意义。     

汉族风俗演变规律论——汉族风俗研究之三（连载）

汉族风俗在上下五千年的会承变异的过程中,形成了由野而文、俭奢互变、汉胡相杂、礼俗互动的演变规律.     

浅议毛泽东诗词中的比喻

毛泽东同志在其诗词中，巧妙地运用了大量比喻，从而使诗词熠熠生辉。文章就其比喻的结构、运用比喻的特点以及运用比喻所起的作用进行了探讨。     

李萨茹图形的几种实验方法

李萨茹图形在频率测量中有重要作用,本文总结了李萨茹图形的三种实验方法和特点,并简单介绍其应用.     

Stochastic models of failure in random environments

Stochastic models of failure modes of frequent occurrence in the engineering sciences are considered. The failure-producing stress environment is modelled as a stationary stochastic process. Using theoretical properties of the sample paths of these processes, failure-time distributions which belong to the Birnbaum-Saunders family are obtained. Several examples of particular engineering relevance are treated.     

雄奇淡远总相宜

潘天寿先生不仅是一位画坛巨匠，而且是一位富有才情的杰出诗人，现存诗歌三百余首。这些作品反映了他的心路历程，从风格上说，受韩愈和李贺影响较大，雄放奇崛，但同时也受到杨万里影响，呈现出自然淡远的风貌。