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[求助]
DPD建模求助
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各位虫友： 我在看DPD建模的教程中，针对PP（聚丙烯）建模，教程中有这样一段To ensure that the physical density corresponds to the reduced density of 3, for which the correlation was derived, the length scale must be set. As derived above, the bead volume is 328.3 cm3 per mole beads, or 545 Å3 for one bead. Hence 3 beads occupy a volume of 3*545 = 1635 Å3, corresponding to a cube with edge 16351/3 = 11.8 Å. This value must be chosen as length scale to match both the required physical and reduced density. Half the length scale (5.9 Å  may be used as the bead radius for display purposes.其中As derived above, the bead volume is 328.3 cm3 per mole beads, or 545 Å3 for one bead. 怎么由328.3 cm3/mol 得到545 Å3 ，请求高手指点，不胜感激。@smutao |
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