大型化工装置输氧设备的应用与选择

介绍大型化工装置输氧设备的应用与使用情况,从实际使用经验出发,探讨输氧设备的选择原则。

母体外的生命新体验

阿道斯·哈克斯利曾写过一本著名的科幻小说———《美丽新世界》,在书中他描述了一个可以在体外孕育胎儿的未来世界。但他可能不会想到,当这类研究真的开始进行时,会和“克隆人”研究一样引发一场伦理与科学的论战。

Influence of Warm Oxide Layer on Wettability and Contact Angle for Heat Transport Devices

Recently, high heat density has become a problem in electronic devices. Therefore, high heat-transfer efficiency is required in copper heat exchangers. Improvement ofwettability is reported to improve the heat-transfer efficiency. In previous studies, copper oxide layer improves the wettability. In this study, we focus on a copper oxide layer produced under warm conditions （from 200 to 300 ℃）, which are suitable oxidation conditions for improving wettability. Experimental results showed that the surface of the specimens was covered by the oxidation layer and took on a black color. Furthermore, the wettability was improved by the warm copper oxide layer. While, the surface roughness was approximately constant to each warm oxidized specimen. Whereat, the warm oxide layer was observed by SEM （sanning electron microscope）. The results from SEM observations showed that the warm copper oxide layer consisted of stacks and combinations of nanoscopic warm oxidation particles. Thus, the warm oxidation layer has nanoscopic surface asperities. It is seemed that these nanoscopic asperities improved the wettability.

佐祎夫人

她披面纱,只有真主知道是为了什么,我将永远猜不透她那面纱后的表情。阿尔及尔的妇女们开始自我解放了。她们不愿再顺从她们的丈夫,开始露着面孔、昂首挺胸地走路。漫漫长夜终成过去了。佐祎夫人想的可不一样。我估计她是想的多讲的少。她只是偶尔发表一下意见,但言简意赅。