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。
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。
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 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。
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 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。
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