Buffon's needle and the estimation of migration distances

A procedure is suggested for estimating migration distances from data on the proportion of migrants crossing regional boundaries. The method makes use of Buffon's needle, a problem in geometrical probability from the eighteenth century that was originally used as an empirical means of estimating π. The procedure is described for various scenarios that differ in their assumptions about region shape, the spatial distribution of population, and the distribution of migration distances. An application to migration distances in the United States is given, and additional attention is given to the estimation of intraregional migration distances.     

被社会环境造就与造就社会环境——论小说中人物与社会环境关系的特殊形态

小说创作有三个要素：人物、情节、环境。小说中人物与环境的关系通常解释为：＂环境是人物展开交往和活动的具体场所。＂但在以著名历史人物为原型的小说中,人物与环境出现了复杂的情形,环境尤其是社会环境并不只是人物展开交往和活动的场所,还是人物性格形成的重要因素;著名历史人物对社会环境的改变也着极为重要的作用。《斯巴达克思》和《上尉的女儿》就是如此。     

Statistical techniques in stereology

Stereology typically concerns estimation of properties of a geometric structure from plane section information. This paperprovides a brief review of some statistical aspects of this rapidly developing field, with some reference to applications in the earth sciences. After an introductory discussion of the scope of stereology, section 2 briefly mentions results applicable when no assumptions can be made about the stochastic nature of the sampled matrix, statistical considerations then arising solelyfrom the ‘randomness’ of the plane section. The next two sections postulate embedded particles of specific shapes, the particular case of spheres being discussed in some detail.

References are made to results for ‘thin slices’ and other prob-ing mechanisms. Randomly located convex particles, of otherwise arbitrary shape, are discussed in section 5 and the review concludes with a specific application of stereological ideas to some data on neolithic mining.     

论辞格理论与辞格发展之间的互动

古代修辞理论与辞格发展之间存在着复杂的互动关系。本文通过个案分析,证实了三点:其一,辞格的发展、演变本质上依赖于语言、文体本身提供的可能性,辞格理论的影响只是在发展方向上的诱导,并且这种诱导并不是总能成功;其二,这种诱导以理论被辞格使用者认同为前提,而特定文化背景或文学思潮可增强这种认同感,从而强化诱导;其三,当辞格使用者面对关于这一辞格的不同的甚至对立的理论主张时,他们会作出折中或取舍;而理论创造者面对辞格的发展变化,也有可能作出新的概括或补充。     

空间格义背后的举意与旁观——《日用家当》中“家宅”的心理几何图解

在爱丽丝·沃克的短篇小说《日用家当》中,家宅被赋予了一定的格义属性,这可以被视为19世纪女性主义文学批评语境中的心理现象学介入。家宅格义背后的心理图解划清了个体＂生存空间＂的原型与流变,洋溢着深切的心理几何假设内涵。作者借助不同人物对于家宅的写实性解读,提供了一个富有曲面内涵的边缘记忆空间,揭示了主体的物我元一思想已然深植于家宅意象当中,并以拓扑图腾的同胚形式得以彰显。家宅的心理几何图解立体地刻画了个体在生存空间日渐缩限时的困顿与挣扎,更是直指个体守护本我世界时的一种精神重估,而这正是该部文学作品所隐含的原生代性旨归所在。     

“格籍”是去还是留？——从“移意”说起

本文对<修辞精品六十格>中谭永祥先生所创建的"移意"、"会意"两种辞格能否取得"格籍"持怀疑态度.认为,因"移意"缺乏表现力,不应被立为辞格;鉴于"会意"定义的模糊性,难以让读者把握其本质特征,应重新命名和界定,或划归现有辞格.     

Finding a Noncrossing Steiner Forest in Plane Graphs Under a 2-Face Condition

Let G = (V,E) be a plane graph with nonnegative edge weights, and let be a family of k vertex sets , called nets. Then a noncrossing Steiner forest for in G is a set of k trees in G such that each tree connects all vertices, called terminals, in net N _i, any two trees in do not cross each other, and the sum of edge weights of all trees is minimum. In this paper we give an algorithm to find a noncrossing Steiner forest in a plane graph G for the case where all terminals in nets lie on any two of the face boundaries of G. The algorithm takes time if G has n vertices and each net contains a bounded number of terminals.     

The Incremental Group Testing Model for Gap Closing in Sequencing Long Molecules

In this paper, we propose the incremental group testing model for the gap closing problem, which assumes that we can tell the difference between the outcome of testing a subset S, and the outcome of testing S {x}. We also give improvements over currently best results in literature for some other models.     

结构助词“的”的使用规律

对结构助词“的”的使用规律。从句子、语义、语用三个平面加以考察。“的”的取舍对句法、语义结构关系产生影响时，必须用“的”；对句法、语义结构的改变没有影响时，“的”的取舍由语用上的需要决定。“的”的取舍在句法、语义规则上具有强制性，在语用规则上具有选择性。     

直观判定法的改进

改进了文献～（［１］）所提出的确定主应力方法的结论，使之更完善，应用更方便。