Thus essay introduces the design and calculate of polassium sulfate production process in the circulate crossover method with the help of ion exchange resin.
本文介绍了离子树脂循环交换法生产硫酸钾工艺设计计算方法,可用于工艺、设备设计和指导生产管理。
Some relations among weak α-skew Armendariz rings,α-rigid rings,α-SC rings and semicommutative rings are studied by some examples.
研究了弱-αskew Armendariz环、-αrigid环、α-SC环以及半交换环的关系。
Then U_n(R) is not a semicommutative ring.
则Un(R)不是半交换环。
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