本文在以VO为主成分的选择氧化制对叔丁基苯甲醛催化剂上,通过0-TPD、TPR表征技术研究了不同助剂的添加对催化剂表面氧性质的影响,并与催化剂反应性能相关联.
The iPod and iPhone could soon be helping to teach people how to sing along to their favorite tracks under plans drawn up by Apple to turn the devices into mobile karaoke machines. It found worldwide
互联网的诞生把虚拟网络世界带到普通大众面前,但网络上的谩骂、人身攻击等现象也常常发生。数字时代到来之后,我们都应该好好学习一下“网络礼节”。 e-Etiquette通用的十条核心规则 Rule 1:Remember the Human 记住人的存在。(你当着面不会说的话,在网上也不要说。) Rule 2:Adhere to the same standards of behavior on
有些事情在暗夜做才有效果,比如放焰火、讲鬼故事,还有为你的插电式混合动力电动汽车充电。一项新的研究表明夜间为汽车充电产生的臭氧较少。该研究成果刊登在《环境研究快报
该文介绍一种具有宽量程(7倍程)、低输入电流(10pA)、快速(μS)的对数放大器。
Elephants have four distinct personalities that help their herd survive in the African bush, scientists have found. With their grey skin, mournful eyes and slow plodding gait, you could be forgiven f