Small size,large density and vertical ordering Ge quantum dots(QDs)were grown by UHV/CVD system.
在超高真空化学汽相淀积设备(UHV/CVD)上生长了小尺寸、大密度、垂直自对准的Ge量子点。
Different type of vaccum pump and its combination used in existing polyester plant were introduced,also the economic analysis was done.
介绍已有的聚酯装置中所使用的不同形式的真空泵及组合 ,并对其进行经济分析。
Introduced are four displacing methods, namely complete mixing, non-mixing, vaccum deaeration, and pressure displacement.
介绍了常用的四种置换方法,即完全混合置换、无混合置换、真空置换和加压置换。