Mr.Obama spoke in advance of meeting at the U.N. late Wednesday of foreign ministers of the five permanent U.N.Security Council member countries and Germany - the P5+1, who have been trying to re-engage Iran in negotiations on its nuclear program.
VOA: standard.2009.09.23
And then the number of pairs at month n is the number of pairs at month n - 1 plus the number of pairs at month n - 2.
我们让第一个月的兔子数是1对,第n个月的兔子对数,是第n-1个月的兔子对数。
If you have a sample with n observations, it's the summation I = 1 to n of xi/n--that's the average.
如果你有n个观测值,对Xi从i=1到n求和再除以n
So, it would be a good question to ask n why are we limited clearly there's this relationship between l and n, and we can't get any higher than n equals one.
那我们要问了,为什么我们被限制了,很明显,l和,有关系,为什么不能取到,n-1更大的值。
How do I rea-- replace the expression FOR t of n minus 1? Substitute it in again.
我们怎么来代替t这个表达式呢?,再来替换掉它,t等于。
So when we count, generally, again, we start from zero, we go to N minus 1.
当我们计数时,一般的,再次强调,我们从0开始,到N-1结束。
e The charge on the anion times minus e, so there is the minus e squared, 0R0 and divided by 4 pi epsilon zero r naught, because now I am evaluating this function at r naught, one minus one over n where n is the Born exponent.
阴离子的电荷乘以,因此会有-e的频繁,除以4πε,因为现在我用r圈评估这个函数,1-1/n,n是波恩指数。
So finally, if we talk about our last example of when n is going to be equal 2, l -1 and then minus 1 for m.
最后我们要讲的,这个例子,是n等于2时,等于1,we,can,have,2,,1,for,l,而m等于。
Where you go from problem of size n to a problem of size n minus 1.
或者缩减了2,这都一样的,也就是把问题的规模从n变成了n-1。
l So, if we're talking about a 4 p orbital, and our equation is n minus 1 minus l, the principle quantum number is 1 4, 1 is 1 -- what is l for a p orbital?
我们方程是n减去1减去,主量子数是,4,1是1,--p轨道的l是多少?,学生:
They divide by n-1 to make it an unbiased estimator of the population variance, but I'm just going to show it in a simple way here.
当除以n-1表示的是对总体的,无偏估计,我在这里只是说的简单一点
So this code is identical functionally nonswitch c to the last implementation we saw, nonswitch.c, but I'm just ever-more emphatically saying, "In case 1," that is when n equals 1 -- or when case 2 applies -- when n equals 2 or when n equals 3 do what?
所以这些代码到最后的实现上,功能是,完全相同的,但是我想要再次强调一下,“在case,1“,那是当n等于1时1,或者当case,2适用-,当n等于2或者当n等于3,它将做什么?
We also know how to figure out the energy of this orbital, and we know how to figure out the energy using this formula here, which was the binding energy, -Rh which is negative r h, we can plug it in because n equals 1, so over 1 squared, and the actual energy is here.
我们知道如何算出,这个轨道的能级,而且我们知道如何,用这个公式,算出能量,也即是结合能,等于,我们把n等于1代进来,所以除以1的平方,这就是能量。
I've got to test to see if I'm in the base case, and if I'm not, then I need to move a tower of size n minus 1, I need to move a tower of size 1, and I need to move a second-sorry about that a second tower of size n minus 1.
首先我看看我是不是在最基本的情况,如果不是的话,我得先做一个N-1个,圆盘的移动,移动一个圆盘,然后再做一次N-1个圆盘的移动。
If I want to move this stack here, I'm going to take a stack of size n minus 1 move it to the spare spot, now I can move the base disk over, and then I'm going to move that stack of size n minus 1 to there. That's literally what I did, OK?
如果我想移动这些圆盘,我先把从n-1个圆盘1,移动到多余的柱子上去,这样我就能把最底下的圆盘放到这儿了,然后再把从n-1个圆盘放到这儿来,这就是确切的我怎么做的对不对?
So that's the 1 s orbital - we have n squared or 1 degenerate orbitals.
所以这是1s轨道,我们有n平方,或者1个简并轨道。
And now I have a problem of size N minus 1.
现在是一个N-1大小的问题。
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