重庆近11年大气混合层厚度研究

根据新闻颁国家标准ＧＢ／Ｔ１３２０１－９１的规定，计算了重庆地区近１１年大气混合厚度，分析结果表明，重庆地区大气混合层厚度有明显日变化和季节变化，大气稳定度是混合层厚度的主要决定因子。     

Mechanics and Morphology of Silk Drawn from Anesthetized Spiders

 CO₂ and N₂ anesthetized Nephila spiders produced dragline silk with mechanical properties that differed from control silk as a function of time under anesthesia. Silk from CO₂ spiders had a significantly lower breaking strain and breaking energy, significantly higher initial modulus, and marginally lower breaking stress. At the onset of anesthesia the silk diameter became highly variable. During deep anesthesia silk either became thinner or retained cross-section but fibrillated. Received: 26 August 1999 / Accepted in revised form: 22 December 1999