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PROFESSOR BAWENDI: The only But it's hard to imagine an irreversible compression the way we can just imagine an irreversible expansion.
,但是我们很难,像描述不可逆膨胀一样,来描述不可逆压缩。
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Adiabatic meaning there's no heat involved, and we're going to see how that differs from the isothermal expansion and compression.
绝热意味着没有热量的传递，我们将看到它,与等温过程的区别。
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We transition to actually real world applications later on like a compression-- how do you take a huge amount of data ; and actually whittle it down into something more manageable; something that uses less of your disk space.
然后我们会讲生活中的应用程序,比方说压缩文件——,把大量的数据分解使其更易管理;,并占用尽量少的磁盘空间。
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Instead, what's difficult in Crane is a kind of compression in his writing.
实际上，克莱恩的诗难读的原因,是在于他的作品中过分简要的阐述。
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When the body is in stress, we have various unusual stimulations of the visual sections of the brain, and perhaps that explains the white light or the feeling of compression in the tunnel.
身体受压时,我们收到对大脑视觉区域,各种不同寻常的的刺激,也许这可以解释白光,或者在隧道里压抑的感觉
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In the opposite case, if you have a compression, then it's the opposite of expansion.
绝热压缩，的情况，与此相反。
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You've just done an adiabatic compression of the ideal gas, you can pretend there is an ideal gas.
这就是对理想气体的,绝热压缩，---我们把空气近似作为理想气体处理。
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And now we're going to have another adiabatic step, an adiabatic compression.
现在我们进行另外一步，绝热收缩过程。
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So if you've got to pump that tire really a lot, then you're going to you're going to really feel a lot of heat there. The compression of the basically it's an adiabatic compression.
所以若果你给轮胎，打了很多的气，你会觉得你感觉,阀门那儿非常的烫，这种压缩,基本上是一个绝热的压缩。
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Our constraint is going to be an adiabatic expansion or compression.
现在约束改成了,绝热膨胀，或者压缩。
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A compression is a little bit more complicated.
压缩要复杂一些。
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Compression you're expected to heat up, right?
压缩会升温，没错吧？
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So expansion work, for instance, or compression work, is if you have a piston with a gas in it. All right, you put a pressure on this piston here, and you compress the gas down. This is compression work.
力乘以距离，就是功，功有许多种：,电可以做功,驱动电机与电风扇,磁力也可以做功。
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You have to do it awfully fast to get your irreversible compression.
我们要压缩得非常快,才能实现不可逆压缩。
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Then we're going to have another isothermal step, a compression to some point four.
然后有另外一个绝热过程，绝热压缩到4点。
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Step three to four isothermal compression, w2 delta u is going to be q2 plus w2.
第三步，到四点的等温压缩，Δu等于q2加。
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