搜索 - 科创

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介绍在这里，部分内容需要翻墙才能看完整 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 它是世界上第一颗由高中生设计的CubeSat——TJ3Sat的一部分，与Pumpkin...

音速的计算可以使用当地音速的公式完成。从公式可以知道，要提高当地音速可以从提高温度，降低分子量，提高比热比。提升温度常用的办法就是加铝，同时铝还能消耗燃气中水蒸气和二氧化碳中的氧，从而降低分子量。

想要计算出六方最密堆积的空间利用率，我们就需要计算出六方晶胞的密度，计算过程如下：设晶胞长、宽、高分别为a,b,h，每个原子半径为r。由图7得，晶胞长、宽都为原子核间距，即a=b=2r。

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