球形气体支承的动态特性

本文研究球形气体支承，支承中通过环形截面和一系列间隔的供气装置向润滑层供气。当球心偏离中心位置的位移参数很小时，气体润滑的不平衡雷诺方程将简化为准平稳形式，这样可以对其进行积分，而与活动球的运动方程组无关。     

主题吧的精彩

又是夜幕降临时,心底某种躁动难安的欲望开始宣泄,被酒精与夜色浸泡着的人们,高唱着白天不懂夜的黑,早已把白日俗世忘得一干二净,眼前的只有夜色独美的异度空间——今晚要"蒲吧"。早在两年前,广州城内就悄然兴起了主题吧,它们均以时下城市潮人最关注的热门事物为主题,凭着独树一帜与众不同的特色,在一众酒吧中脱颖而出,吸引了不少志同道合之士光顾。     

基座振动时半球谐振陀螺的误差

本文研究了新的惯性信息测量仪－－振动基座上的半球谐振陀螺的动力学。确立了有外产振动时仪表工作中产生误差的机理。得出了连接半球谐振陀螺误差与其谐振子非理想性和基座线振动及角振动参数的关系式。     

Fate of prebiotic adenine

Equilibrium adsorption isotherm data for the purine base adenine has been obtained on several prebiotically relevant minerals by frontal analysis using water as a mobile phase. Adenine is far displaced toward adsorption on pyrite (FeS2), quartz (SiO2), and pyrrhotite (FeS), but somewhat less for magnetite (Fe3O4) and forsterite (Mg2SiO4). The prebiotic prevalence of these minerals would have allowed them to act as a sink for adenine; removal from the aqueous phase would confer protection from hydrolysis as well, establishing a nonequilibrium thermodynamic framework for increased adenine synthesis. Our results provide evidence that adsorption phenomena may have been critical for the primordial genetic architecture.     

A preliminary survey of non-lichenized fungi cultured from the hyperarid Atacama Desert of Chile

The Atacama Desert is one of the driest environments on Earth, and has been so for over 200,000 years. Previous reports have suggested that surprisingly low numbers of culturable bacteria, counted as biomass or species diversity, are present in Atacama sands collected from the most hyperarid regions. In previous studies, the presence of eukaryotic organisms was not discussed. In this report, we describe a method of direct plating onto rich media that resulted in culturing a range of fungi from Atacama samples. All fungi identified in this preliminary survey are spore-forming saprobes that are readily dispersed by wind, a likely mechanism that accounts for their presence in the central Atacama Desert.