"But if you look into the Mekong delta, for example in Vietnam, it has shown the 30-year cycle, but the phase and amplitude is going up and then going up like that."

VOA: standard.2009.12.21

So, for example, if we were looking at the actual wave function, we would say that these parts here have a positive amplitude, and in here we have a negative amplitude.

我们看，一个波函数,我们说，它这部分幅值，为正,这部分幅值为负，当我们看。

麻省理工公开课 - 化学原理课程节选

But when we're thinking about actual wave behavior of electrons, it's just important to keep in the back of our head that some areas have positive amplitude and some have negative.

电子的波动行为时,我们，要记住,某些地方是正的,某些地方是负的,当我们讲到。

麻省理工公开课 - 化学原理课程节选

Then you get successively deeper, II through IV, slow, irregular, high amplitude delta waves, and then once you reach stage IV you start going up again, up through stage III and II.

然后睡得越来越深，从第二到第四阶段，慢，不规则，高振幅的δ波，等你到达第四阶段，你又开始返回，第三阶段和第二阶段。

耶鲁公开课 - 心理学导论课程节选

So, regardless of the type of wave that we're talking about, there's some common definitions that we want to make sure that we're all able to use, and the first is amplitude.

所以，不管我们讨论的,是哪种波，它们都有一些我们,能用到的共同的定义,其中第一个就是幅值。

麻省理工公开课 - 化学原理课程节选

So, sometimes people get confused when they're solving problems and call the amplitude this distance all the way from the max to the min but it's only half of that because we're only going back to the average level.

解题的时候会弄错，把这个从,最大值到最小值的距离,叫做幅值，但实际上,只有它的一半,只是它和平均值的差距。

麻省理工公开课 - 化学原理课程节选

And when we're talking about the amplitude of the wave, we're talking about the deviation from that average level. So, if we define the average level as zero, you can have either a positive amplitude or a negative amplitude.

当我们讨论一个波的振幅时,我们说的是偏离平均位置的量,如果我们把平均位置,定义为零的话，那幅值不是,正的就是负的，有时候人们在。

麻省理工公开课 - 化学原理课程节选

And you can think about that if you think about a standing wave, for example, where you can have amplitude at many different values of x, so an amplitude at many different distances, but you also have areas where there is a amplitude.

你们可以想象一下驻波，在不同ｘ处,可以有不同的振幅，在不同的距离有不同的振幅，但在某些地方振幅等于０．

麻省理工公开课 - 化学原理课程节选

So let's think of them a little bit more by graphing the amplitude of the wave, and seeing how we can have this constructive interference.

让我们把波的,振幅画出来考虑一下,我们怎么能得到这种相长干涉。

麻省理工公开课 - 化学原理课程节选

So, I mentioned we should be able to figure out where the maximum amplitude is.

我说过，我们可以找到,幅值的最大处，你们看到。

麻省理工公开课 - 化学原理课程节选

Remember when we have waves we can have positive or a negative amplitude.

记住一个波会有,正的幅值和负的幅值。

麻省理工公开课 - 化学原理课程节选

So again, if we think of a graph of the wave function, we had the wave function is at its highest amplitude when it's lined up with the nucleus, and then as we got further away from the nucleus, the amplitude of the wave function ends up tapering off until it never hits zero exactly, but it goes down very low.

同样，如果我们想象一幅波函数的图，波函数在原子核的位置上,有着最高的振幅，随着与原子核距离变远，波函数振幅逐渐变小直到,它永远不会到零，但它会变得很小。

麻省理工公开课 - 化学原理课程节选

So if we square sigma 1 s star, we flip the amplitude so it's all positive now, but again we still have this node right in the middle.

如果我们平方1s星，我们把振幅翻转所以现在都是正的，但同样在中间有个节点。

麻省理工公开课 - 化学原理课程节选

sa So we have 1 s a, and we're drawing this as having a positive amplitude, but since we have destructive interference we're going to draw 1 s b as having the opposite sign, so we have a plus and a minus in terms of signs.

我们有，我们把这画成一个正的振幅，但因为我们是相消干涉,我们把1sb画成相反的符号，所以我们有一正一负两个符号。

麻省理工公开课 - 化学原理课程节选