The agreement to be signed Thursday replaces the START-1 treaty, which U.S.President George H.W.Bush and Soviet President Mikhail Gorbachev signed in 1991.

VOA: standard.2010.04.04

U OK, so let's look at delta u. Delta u is q plus w.

好的，让我们看看Δ

麻省理工公开课 - 热力学与动力学课程节选

And of course, in either case, w delta u is q plus w, so it's q irreversible plus w irreversible, u being a state function it's the same in either case.

当然了，在这两个过程中，Δu都等于q加，因此现在是q不可逆加w不可逆，同时u在这两个过程中都是态函数。

麻省理工公开课 - 热力学与动力学课程节选

president's actions are the same as his predecessor. (Speech) Larijani argued two actions last week showed that little had changed in U.S.policy since the presidency of George W.Bush.

VOA: standard.2009.11.15

U It's u, because u is to q plus w right, heat and work, but it's adiabatic. So there's no heat, exchange with the environment, and it's constant volume, so there's no p dV work, right.

什么是零？是U，因为,等于q加w，热量和功，但这是绝热的，所以系统与环境间没有热量交换；,同时它是灯体的，所以也没有pdV形式的功。

麻省理工公开课 - 热力学与动力学课程节选