一篇文献上说机械球磨法合成纳米材料需要控制一个BPR值为（20:1和 40:1），请问BPR什么意思？怎么控制？文中也没有BPR的全称。
文献中的原话“Each system was round in two series differing from each other in BPR values (20:1 and 40:1). ” “ Increase in delivered energy during the milling process through the change of BPR value from 20:1 to 40:1 accelerated the beginning of CaTiO3 formation”
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