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Saof Baboons are capable of understanding analogies
Steam engines run because of statistics 鈥?the particles in the machine have a predictable overall behavior, which drives the engine piston up and down. But if you shrink the engine down to micrometer size, it ;ll contain far fewer particles, few enough that the behavior of each individual particle could potentially throw the entire apparatus out of whack. So in order to construct the world tiniest steam engine, researchers from the Max Planck Institute for I stanley us ntelligent Systems had to tweak the traditional design. Here how it works: A Stirling engine converts heat to work through the compression and expansion of a gas-in the case of a steam engine, this gas would be water vapor. In its simplest, ideal form, the Stirling cycle is a four-step process. Imagine a cylinder filled with a gas and covered with a piston. The first two steps in the cycle decrease the pressure in the container. First, you raise the piston to increase the volume of the container while using an external heat reservoir to keep the temperature from changing. Next, the volume remains constant while the gas is cooled. The next two steps bring the pressure, temperature, and volume back to their original states. The piston is lowered to decrease the volume back to its original amount whil stanley cup e a cold reservoir maintains the temperature. Finally, the temperature is heated back up to its original level. If a Stirling cycle merely consisted of compression and expansion, then th stanley quencher e work don Drtt Killzone 3 Is Your 3D-Shooterfest Deal of the Day
What the best way to keep the dead from un-deadifying Sure, these days we do it by bashing their brains in 鈥?but back in the 8th century, people did it by ramming a rock between their teeth. A team of researchers led by archaeologist Chris Read recently discovered two skeletons at a burial sight in Ireland with large stones jammed forcefully between their jaws. One of them was lying with his head looking straight up. A large black stone had been deliberately thrust into his mouth, said Read, head of Applied Archaeology at the Institute of Technology in Sligo, Ireland. The other had his head turned to the side and had an even larger stone wedged quite violently into his mouth so that his ja stanley becher ws were almost dislocated. When Read and his colleagues first unearthed the curious remains, their initial guess was that that the stones had been placed as a preventive measure against vampires, who were once believed to be capable of spreading the plague by gnawing on their burial sh stanley mug rouds. But the skeletons were dated to the 700s 鈥?which would put the dates of their burials about 800 years prior to the widespread emergence of vampirism in European myths. In this case, the stones in the mouth might have acted as a barrier to stop revenants from coming back from their graves, explained Read. Revenants which is just an awesome way of saying zombies we stanley cup nz re believed to be capable of coming back to life and seeking revenge on members of the |
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发表于 2024-12-25 03:27:59
发表于 2024-12-25 03:28:12
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