搜索 - 科创

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稀土永久磁铁可以带来外形更小但性能更高的发动机和发电机。但其中的难题是它需要一个成本昂贵的多步骤流程才能制造出来。如今，美国东北大学的研究人员宣布发明了一种用来制造钐钴永久磁铁的低价、绿色环保且只有一...

注意：1.本文主要内容是对组织胺H2受体抑制剂（抗胃酸）药物西咪替丁（甲氰咪胍）的开发过程的简介与科普。阅读此文需要一些基础的化学知识比如pKa（酸度系数）值，有机化合物的电子分布等概念以及基础的生...

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