The great catastrophe: causes of the Permo-Triassic marine mass extinctionOA

The marine losses during the Permo-Triassic mass extinction were the worst ever experienced. All groups were badly affected, especially amongst the benthos(e.g. brachiopods, corals, bryozoans, foraminifers,ostracods). Planktonic populations underwent a fundamental change with eukaryotic algae being replaced by nitrogen-fixing bacteria, green-sulphur bacteria, sulphate-reducing bacteria and prasinophytes. Detailed studies of boundary sections, especially those in South China, have resolved the cr...     

Revisiting non-linear Thomson scattering with metamaterialsOA

<正>Non-linear optics is a branch of optics that studies the intriguing and sometimes unexpected ways in which light and matter interact at high intensities, when the polarization density does not respond linearly to the electric field of the light. The pursuit of the perfect non-linear optical material has been ongoing ever since the pioneering experiment on second harmonic generation carried out by Franken in 1961 [1]. Indeed,     

在试错中成长

<正>前段时间露营时看到隔壁一家的孩子一上午几乎都在被限制,因为是在河边,父母的关切声就没停过：不要靠近水边,不要上树,不要上坡,不要走太远……但今天我们不讨论这样做是否正确,我只想通过这件事,我想跟大家聊一个词,叫作“容错率”。什么是“容错率”？容错率,就是父母对孩子失败/犯错结果的承受度。更简单来说,就是孩子的某个行为,     

中、美两国企业新产品开发方面的比较研究

以研究中美两国企业成功开发新产品的过程及其绩效结果为目的,在文献研究的基础上,首先,构建了基于"能力-优势位置-绩效"观点的成功开发新产品的模型架构,并提出研究假设,其次,利用时中国和美国企业调研的数据对模型进行了实证检验,再次,对比分析了中美两国企业新产品开发的过程和影响因素的作用,最后,探究了中关企业新产品开发过程中的异同.研究结果表明,中国企业产品创新影响因素的作用和影响过程与美国等发达国家有着大体相同的过程路径,但一些主要影响因素对于企业成功开发新产品所起作用的强弱程度异于美国.     

三坐标测量机在磁基准中的应用

本文对三坐标测量机（CMM）的用途、基本工作原理、使用工具和方法论以及六级聚焦进行探讨,指出其优势和广阔的应用前景,同时也指出了需要注意的几个方面。     

我们都曾是哭鼻子的小屁孩儿

那时花开,流水芳年。 青春很锋利,很容易就划开记忆的容颜,岁月如梭,稍纵即逝,我们还没来得及回忆青涩和苦涩,感受阵痛和欣喜,时间就呼啸而过了。     

虎年说虎

——现役脑残之王:马布里作为当年96黄金一代的球员之一,马布里如今的生活简直可以用穷困潦倒来形容,自从当年他自称天下第一控卫起,马布里的生涯评定便每况愈下。自此,马布里就开始了与全世界对抗的戏码。最初在森林狼,他就因不满加内特拿到亿元高薪而愤然离开,拆散了一对本该是黄金搭档的组合。在转投纽约后,尽管身为纽约之子,但尼克斯宁可掏出两千万也要请这位大爷走人。自从被尼克斯队抛弃之     

终极娱乐——给魔术师和心灵魔术师的导演笔记（节选）

第二章神秘娱乐的层次关系 从我们的这边看出去,我们带给观众的表演是魔术效果（effect）。而从观众的角度来看呢,我们的演出可分成三种不同的感受：     

Beyond sensation seeking: affect regulation as a framework for predicting risk-taking behaviors in high-risk sport

Sensation seeking has been widely studied when investigating individual differences in the propensity for taking risks. However, risk taking can serve many different goals beyond the simple management of physiological arousal. The present study is an investigation of affect self-regulation as a predictor of risk-taking behaviors in high-risk sport. Risk-taking behaviors, negative affectivity, escape self-awareness strategy, and sensation seeking data were obtained from 265 high-risk sportsmen. Moderated hierarchical regression analysis revealed significant main and interaction effects of negative affectivity and escape self-awareness strategy in predicting risk-taking behaviors: high-risk sportsmen's negative affectivity leads them to adopt risk-taking behaviors only if they also use escape self-awareness strategy. Furthermore, the affective model remained significant when controlling for sensation seeking. The present study contributes to an in-depth understanding of risk taking in high-risk sport.