A few weeks ago a clip went viral of a strange new contact sport emerging from the antipodes. Two burly men, one of them holding a football, sprint at each other on a kind of catwalk, waiting for the bloop-bloop-bloop of an electronic countdown before they launch into their runs. Neither wears any kind of padding or protective gear. Surrounded by baying spectators, the men collide in the middle of the track, making impact through shoulders, knees, hips, stomachs: in most instances, one of the runners is knocked flat on his back or face from the force of the collision, and the other stands tall in triumph. “We are literally getting dumber as a civilization,” noted one of the many comments on the clip on X.
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What the plebeians received vs. what the Lotus elite received in December 1992.After judging books entirely by their covers, I've chosen the official Lotus manuals for 1.0A, 2.2, and 3.4, and two compilations of tips and tricks previously published in LOTUS Magazine. I flip through other stuff as well, but honestly nothing is holding my attention this time around; they all read the same, "dry and boring."，更多细节参见谷歌
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They also needed an alternative to conventional X-rays. In a clinical linac, X-ray photons are produced by dumping high-energy electrons into a bremsstrahlung target, which is made of a material with a high atomic number, like tungsten or copper. The target slows the electrons, converting their kinetic energy into X-ray photons. It’s an inherently inefficient process that wastes most of the beam power as heat and makes it extremely difficult to reach the ultrahigh dose rates required for FLASH. High-energy electrons, by contrast, can be switched on and off within milliseconds. And because they have a charge and can be steered by magnets, electrons can be precisely guided to reach tumors deep within the body. (Researchers are also investigating protons and carbon ions; see the sidebar, “What’s the Best Particle for FLASH Therapy?”)