激光场与原子相互作用

本文用量子理论研究激光场与三个原子的相互作用。当初始条件为激光场中有N个光子，而三个原子都处于高能级时，得到了光子数和原子状态各自随时间的变化关系。光子数很大时，量子理论结果与半经典理论果是一致的。     

磁处理对豌豆幼苗生长及生理的效应

用磁感应强度为0．01T的磁场处理豌豆种子或用该磁场处理的水浸种显著促进豌豆幼苗的营养生长，增加干物质累积量，而用同样磁场处理的水浇灌胚根已经伸出的种子则显著抑制幼苗生长及干物质积累。     

Some large trial properties of minimum likelihood allocation

The method of minimum likelihood allocation (MLA) for allocating subjects to treatments in a clinical trial amounts to checking at each stage which allocation would lead an outside observer to find the least evidence of a relationship between treatment and factors of prognostic significance, assuming that the observer would use a linear exponential model. One advantage of MLA is that results from game theory and likelihood theory can be used to prove it has desirable long run properties. Two of these demonstrated here are (1) ‘consistency’, in the sense that the average likelihood ratio which measures design imbalance tends to zero, and (2) ‘efficiency’ in the sense that the variance estimates of treatment effects will tend to be minimized in the long run.     

高压静电场对花生、小麦生长的影响

研究了高压静电场对花生、小麦的生长及根尖细胞有丝分裂的影响.结果表明:以适当场强与时间处理种子可以明显刺激幼苗生长;中期细胞指数的变化与幼苗的生长速度具有一致性,这说明幼苗生长迅速是建立在刺激有丝分裂基础上的.     

Some computational problems related to multinomial trials

Efficient numerical algorithms are developed to evaluate several probabilities related to multinomial trials.In the first part of the paper, the probability distribution of the number of trials until the alternatives j, j = 1,… m, have occurred at least i_j times is computed. The multinomial trials involve the m alternatives l,…, m, with positive probabilities P_l-P_m of occurrence. In the second part, several aspects of a multinomial subset selection problem, discussed by S. S. Gupta and K. Nagel, are investigated.     

论教育人类学的学科性质与研究方法

教育人类学作为人类学的一个分支学科形成于20世纪中叶。教育人类学有不同的流派。以美、英为代表的"文化—教育人类学"强调经验研究,注重田野工作和民族志撰写。在我国,教育人类学与民族教育学有密切的关系,但两者在研究的对象和方法上有明显的不同。这种不同主要来源于作为其学科母体的人类学与民族学的区别。与综合运用各学科的方法对少数民族教育进行研究的民族教育学不同,教育人类学并不局限于少数民族的研究,在研究方法上也更注重田野工作等传统人类学方法的应用。     

浅谈实现社会与环境协调发展的应对措施

传统的“人类利益中心”价值观引发了日益严重的环境危机,如何实现在经济快速发展的同时保持与环境的协调发展,已成为当今人们普遍关注的话题之一。笔者结合实际情况,提出了五种应对措施,以期为改善我国目前的环境危机状况和增强环保能力,尽快实现社会与环境协调发展提出有建设性的意见。     

Mediating production and consumption: cultural capital and 'cultural workers'

This paper examines recent debates about the role of what Bourdieu termed cultural intermediaries in the formation and reproduction of the relations of cultural capital. Workers in the cultural or creative industries were given a central place in Bourdieu's schema in the creation of hierarchies of value in the production and consumption of symbolic goods. Subsequent writers about the apparent emergence of a creative economy (Lash and Urry 1994; Featherstone 1991) have given workers involved in the production and distribution of cultural goods a pivotal place in the development of late or post-modernity. More recent work (Negus 2002; Nixon and du Gay 2002) has criticized the validity and coherence of the term as it has come to be understood and called for more rigour in its definition and use. This paper adds to this debate by considering the book trade as a space in which the gap between production and consumption of cultural goods is mediated. It suggests that cultural intermediaries, as cultural workers, are engaged in the reproduction of the cultural aspects of social class by 'shoring up' their insecure position in the relations of cultural capital, rather than simply being the taste leaders of a reflexive modernity.     

A consistent system of conditional probabilities which is not compatible with any random field

A consistent, Markovian family of conditional densities is constructed which is not compatible with any random field.     

几种传输线的场分布

求开放平板线、外正三角形內圆同轴线、外方內圆同轴线、外正六边形內圆同轴线的特性阻抗而建立的精确保角变换的基础上,本文进一步讨论了显式逆变换函数,从而求得了这几种传输线的场分布的闭合表达式。由于所用保角变换的精确性,所得的显式场分布在内导体和外导体的内接圆尺寸之比小于0.5in。基本上是准确的,在这个尺寸比稍大些时也可作为参考。这些场分布对于了解传输线的功率容量,计算衰减常数,考虑功率耦合,设计有关的有源器件等都是必不可少的。文中获得的几种传输线的场分布的显著特点是计算方便,在一般实用范围內有足够的精度。