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。
We call that a cross section which is the microscopic cross section which as we mentioned before could be absorption, capture, fission, scatter.
我们称为一个横截面,那是宏观横截面,那我们之间提过的，可能是吸收，捕获，裂变，散射。
We can then look at uranium 238 which has a relatively low absorption thermal energy range and essentially has no fission cross section which is why we call uranium 238 a fertile atom.
我们能看看铀238，它有一个，相对低的吸收热能范围，基本上没有裂变横截面，那就是为什么我们称铀238为可转换核素。
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。
And you can see a very high energy as uranium 238 does have a fission cross section which in some ways can be used in fast reactors.
你能看到铀238有很高的能量8，有一个横截面在一些方式下，能够用于快速反应堆中。
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。
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。
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