第一部分是对宇宙再电离时期的研究，这属于国家天文台重点项目21CMA的理论研究部分。
Part one of the thesis is a contribution to the theoretical studies of the 21CMA project, one of NAOC's key project which aims at probing the epoch of reionization.
第二电离能简单地说就是，在你已经拿走一个电子以后，再拿走第二个电子，所需要消耗的能量。
So, second ionization energy simply means you've already taken one electron out, now how much energy does it take for you to take a second electron out.
我们可以发现有效的z等于n的平凡，乘以电离能除以里德堡常数,这些所有再开方，所以等于n乘以,除以RH整体的平方根。
So, if we just rearrange this equation, what we find is that z effective is equal to n squared times the ionization energy, IE all over the Rydberg constant and the square root of this.
然后我们再开始讲元素周期表，我们会看到很多周期性规律，比如电离能，电子亲和能，电负性以及原子半径。
We'll then take a turn to talking about the periodic table, we'll look at a bunch of periodic trends, including ionization energy, electron affinity, electronegativity and atomic radius.
其电弧稳定与否，主要取决于电流过零瞬间的电弧空间电离度、电极发射电子能力及再引燃电压的上升速度。
The stability of the welding arc depends mainly on the voltage and the gas ionization when current zero-crossing as well as the electron emission ability of the electrode.
血管内放射导致细胞死亡的主要形式为凋亡，电离辐射预防再狭窄的主要机制是平滑肌细脑的增殖抑制。
Apoptosis is a major style of cell death induced by endovascular radiation. The inhibition of SMCs proliferation induced by radiation is a main mechanism for prevention of restenosis.
血管内放射导致细胞死亡的主要形式为凋亡，电离辐射预防再狭窄的主要机制是平滑肌细脑的增殖抑制。
Apoptosis is a major style of cell death induced by endovascular radiation. The inhibition of SMCs proliferation induced by radiation is a main mechanism for prevention of restenosis.
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