• AIDS researchers say they still have much work to do on a vaccine against H.I.V.

    VOA: special.2009.09.30

  • Normally I couldn't do that Vdp because this term would have p dV plus V dp, but we've specified the pressure is constant, so the dp part is zero.

    一般情况下我不能这么写,因为这一项会包含pdV和,但是我们已经假定压强为常数,所以包含dp的部分等于零。

    麻省理工公开课 - 热力学与动力学课程节选

  • We want a relationship in p-V space, not in T-V space. So we're going to have to do something about that. But first, it turns out that now we have this R over Cv.

    我们想要p-V空间中的结果,而不是T-V空间中的,因此需要做一些变换,先来看现在的关系,它跟R/Cv有关。

    麻省理工公开课 - 热力学与动力学课程节选

  • take the derivative of this, get the velocity vector and you notice his magnitude is a constant Whichever way you do it, you can then rewrite this as v square over r.

    对这个式子求一次导,就能得到速度矢量,你会发现其模长是常数,不管用什么方法,加速度也可以写成 v^2 / r

    耶鲁公开课 - 基础物理课程节选

  • V They do have the same temperature though.

    不同,a,different,volume。,但是温度是一样的。

    麻省理工公开课 - 热力学与动力学课程节选

  • As long as we understand that, we can do this cancellation and this says on the left-hand side the change in the quantity v square over 2 is a times the change in the quantity x.

    只要我们明白这一点,我们就可以这样做简化,在等号左边,v^/2的变化量,为a乘以x的变化量

    耶鲁公开课 - 基础物理课程节选

  • So we're going to start with a mole of gas, V at some pressure, some volume, T temperature and some mole so V, doing it per mole, and we're going to do two paths here.

    假设有1摩尔气体,具有一点的压强p,体积,温度,我们将让它,经过两条不同的路径。

    麻省理工公开课 - 热力学与动力学课程节选

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