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I showed you the distance between the letters 'A' and 'Z', between day and night."
VOA: special.2009.03.28
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For example, F x y z if I have an equation that looks like this, f of x, y, z.
打个比方，我有个这样的方程。
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I know they have a lot of... Jay-Z, the rap star, he was there.
我知道他们有很多的……Jay-Z，饶舌歌星，他就在那儿。
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So why don't you go ahead and identify the correct electron configuration for carbon, 6 and I'll tell you that z is equal to 6 here.
所以你们为什么不开始,而且识别碳的正确的在你们做作业方面,电子构型，我会告诉你有效电荷量是。
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XYZ I might as well do it as x, y, z because we are talking about something that is going in three space.
我最好设成,因为我们在讨论,三维的事物。
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So the value is z is 4, it's what I expect, right?
所以z的值等于？
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I then create a third variable called "z," add those two digits together, store the sum.
然后我声明了一个叫做“z“的变量“,把这两个数字加起来，把他们的总数存起来。
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It was awkward teaching an introduction Y and probably for that reason while I was teaching Lit 300, which was then called Lit Y, Z Paul de Man was teaching Lit Z.
教入门课非常尴尬,也许正因为这样，我教文学300时，当时它还叫文学，保罗，德，曼教教文学。
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The first is this the z effective, or how much charge is actually in the nucleus that's felt, Z or the I guess we would say the z, how much the charge is on the nucleus that holds it close together.
第一个是有效核电量，或者说实际感受到的核电荷量，又或者我想我可以说就是，使它们保持在一起的,原子核的电荷量。
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x y z And I have another equation f of x, y, z.
若我有另一个方程。
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Yeah, I've still got a binding for z and I'm giving it the same test, but notice now I've got the two same commands but they have different indentation.
对，我还是对z进行了绑定,我还是要对它进行同样的测试，但是请注意现在我有了两个同样的命令,但是它们有不同的缩进。
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Let's bind z eh let's bind z to the-- f if I could type it would help-- say, f of 3. OK?
让我们给z赋值--如果我能打字就好了-,比方说？
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And so what I get is the energy of the system at the equilibrium separation is given by minus z plus.
这就是通过减去z+得到得平衡分离时,我得到的能量体系。
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And the point that I also want to make is the way that they differ, z effective actually differs from the total charge in the nucleus due to an idea called shielding.
我也想指出的一点是它们不同的方式,有效的z事实上不同于原子核的，总电荷量,因为屏蔽效应。
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I'm binding a z to be some value, and then I'm going to run this.
我把z绑定到一个值上，然后运行下代码。
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The power of linearity is F=k1+k2 if I come across f of x, y, z equals k1 plus k2, if it is a linear equation, I don't have to go and solve it all over again.
线性的威力是,一个方程，如果它是个线性方程，那么我就不用再去解他了。
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So, how many distinct, so again, we're talking about distinct kinetic energies, a spectrum for the element hafnium, 72 and I'll tell you here that it has a z of 72, so you don't have to spend two minutes searching your periodic table.
好，有多少分立的……还是一样，我们讨论的还是不同的动能，铪元素的光谱中出现，而且我来告诉大家铪的原子序数是，这样你就不用因为在元素周期表中找它,而花费两分钟的时间了。
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I just go through these equations, 3 but be careful to Z equals three.
我只检查这些方程式，但是注意了，Z等于。
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