In this paper we prove uniqueness and existence of the optimal fission cross section, and give the optimality condition.

给出了最优解的存在性、唯一性以及最优解的充分必要条件。

youdao

So if you take a certain volume and you have a certain amount of material, let's just take the fission cross section as the issue.

所以，如果你得到一定的容积,你有一定量的材料，我们就把裂变横截面当做问题。

youdao

And then of course as part of the absorption we have a fission cross section which, as I said earlier, is what we want to focus on so we can make some power and some heat.

当然作为吸收的一部分，我们有裂变横截面，那是，我之前说的，是我们想要关注的，所以我们可以创造，出一些动力和一些热量。

youdao