被忽视的公共理念——构建为公众服务的公共交通

随着我国私人小汽车拥有量的快速增长,城市交通拥堵等问题日益突出,优先发展公共交通已成共识。但对发展公共交通的探讨通常过于注重如何降低居民出行的经济成本,片面强调公交优先是对工薪阶层和低收入人群的优先。为了引起人们对私人小汽车与公共交通竞争发展条件下被忽视的"公共理念"的关注,使公共交通真正成为所有人的选择,必须在"公共理念"的基础上,针对我国现状提出一系列发展公共交通的举措。     

试论“暴力美学”及其特征

“暴力美学”原指起源于美国,在香港电影界发展成熟的一种艺术趣味和形式探索。现代社会所指“暴力美学”的范围不仅仅包括电影,还包括电子游戏、漫画、动画、平面设计、广告等多个方面。通过研究“暴力美学”,有助于更好地掌握其真正的美学价值与含义。     

稀土永磁R_2Fe_(14)B的结构和磁性分析

本文介绍了稀土铁金属间化合物 R_2Fe_(14)B 及其掺杂系列的制备方法和晶体结构;分析和讨论了它们的内禀磁性;同时也反映了目前国际上永磁材料的研究进展和方向.     

关于电磁感应定律的两种表述

电磁感应定律有两种表述:一种是通量法则;另一种则把感应电动势分成感生电动势和动生电动势两部分。两种表述是否等效,是国内外多年争论而至今尚未解决的问题。争论的焦点是通量法则是否例外。本文通过对两种表述式的内在联系和讨论中经常使用的反例,比较全面而认真的分析,证明了两种表述式对任何闭合回路都完全等效,因此,通量法则没有例外。     

Moment-based tail index estimation

A general method of tail index estimation for heavy-tailed time series, based on examining the growth rate of the logged sample second moment of the data was proposed and studied in Meerschaert and Scheffler (1998. A simple robust estimator for the thickness of heavy tails. J. Statist. Plann. Inference 71, 19–34) as well as Politis (2002. A new approach on estimation of the tail index. C. R. Acad. Sci. Paris, Ser. I 335, 279–282). To improve upon the basic estimator, we introduce a scale-invariant estimator that is computed over subsets of the whole data set. We show that the new estimator, under some stronger conditions on the data, has a polynomial rate of consistency for the tail index. Empirical studies explore how the new method compares with the Hill, Pickands, and DEdH estimators.     

论生态环境的亲和作用对建筑设计的影响

生态环境的亲和作用指的是生态环境要素之间的相互吸引 ,又相互排斥 ,协调共存的特性 .亲和作用目的是保持环境要素的共存 ,而要素间相互作用则是共存的前提 .亲和作用具有两重性 ,它是吸引性和排斥性的统一体 .生态环境的亲和作用主要通过两个因素对单体及群体建筑产生影响 :1 .地景因素 2 .气候因素 .     

论意境的审美结构

意境的结构可分为表层结构、中层结构和深层结构。表层结构是意象，中层结构是象外之象，深层结构是韵外之致、味外之旨。意境就是“象”、“象外之象”、“韵外之致”浑融整合而成的艺术世界。     

The Evolution of Plasticity in Female-Female Desire

Abstract

Previous psychological and anthropological research suggests that female-female desires show greater variability and plasticity than do male-male desires. I argue that plasticity in female-female desire has its origins in the evolved independence between female proceptivity (i.e., motivation to initiate sexual activity) and female arousability (i.e., capacity to become aroused to sexual stimuli), which evolved in concert with the loss of a circumscribed and observable period of estrus in higher primates. Proceptivity is an intrinsically cyclical system, peaking during ovulationwhen estrogen levels are highest, whereas arousability is continuous and hormone-independent. Because female proceptivity peaks only a few days per month, a relatively greater proportion of women's day-to-day desires is governed by arousability. The opposite is true for males, who experience continuously high proceptivity mediated by their continuously high androgen levels. Moreover, because arousability is a responsive rather than an initiatory system, there would have been little evolutionary benefit to “orienting” this system exclusively toward other-sex partners. Therefore, arousability likely permits sexual desires for both sexes. Women will consequently have more opportunities than men to experience situationally-triggered same-sex desires, regardless of their underlying sexual orientation. The implications of this perspective for understanding different manifestations of same-sex sexuality are discussed. doi:10.1300/J056v18n04_01     

n型DMS材料居里温度的极值点

以Zener模型为基础,考虑反铁磁性交换作用对DMS材料居里温度的影响,理论计算证明:n型DMS材料的居里温度有一个极大值,此极大值点投影到xoy平面(掺杂浓度x与反铁磁性交换作用相对强弱y所在的坐标面)上的轨迹是一双曲线,此双曲线为由基质材料与掺杂的磁性杂质决定。