The microstructure and properties of X80 steel will be changed greatly because of heat cycle in welding process.

X80管线钢在焊接过程中，热影响区由于受到焊接过程热的作用，其组织和性能会发生较大的变化。

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If you have time to dry them by hand or let the air do it for you, turning off the heat cycle on your dishwasher is a good way to reduce heat.

如果你有时间等他们在空气中风干或者你愿意用手擦干，那么关闭你的洗碗机的热循环是一个很好的方法，这样可以减少热量。

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The results show that toughness of the coarse grained HAZ is improved after second welding heat cycle except intercritical two-phase heating.

力学性能测试结果表明，除在临界二相区加热外，二次热循环均使粗晶区得到初化。

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You couldn't just run something successfully in a cycle and get work out of it, using the heat from the hot reservoir, without also converting some of the heat that came in to heat that would flow into a cold reservoir.

如果一样东西在循环工作过程中,只有热从高温热源中流出，而没有热流入低温热源，那么此过程,不可能对外做功,不可能把所有热。

麻省理工公开课 - 热力学与动力学课程节选

There's no change in them, and then we also looked at some at non-state functions, work and heat, and saw that those aren't zero going around a cycle. Of course you can do work in a cyclic process, and heat can be exchanged with the environment at the same time.

它们不会有变化，然后我们研究了,一些非态函数，功和热量，并看到,沿着循环行进一周的话,它们并不是零，当然你可以在,一个循环过程中做功，而同时热量可以在系统,与外界环境之间进行交换。

麻省理工公开课 - 热力学与动力学课程节选

It expands. You change your constraints on your system, you heat it up some more, then you take the heat source away, and you put it back in contact with the atmosphere. And you cool it a little bit, change the constraints, cool it a little bit more, and heat, and you've got a closed cycle engine.

让它与大气接触冷却,改变约束，使它继续冷却，然后又再次加热,这就是循环热机，我们以前也研究过，更复杂的机器。

麻省理工公开课 - 热力学与动力学课程节选

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