体育与实时比分

Eagles missing top two WRs as Smith, Wicks ruled out vs. Cowboys

来源: espn.com · 发布于

Eagles missing top two WRs as Smith, Wicks ruled out vs. Cowboys
来源: espn.com

The Eagles' top two receivers -- DeVonta Smith and Dontayvion Wicks -- have been ruled out of Monday night's game against the Cowboys.

The Eagles' top two receivers -- DeVonta Smith and Dontayvion Wicks -- have been ruled out of Monday night's game against the Cowboys.

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Plain silicon grating reveals a hidden 'twist' in light from electron beams
科学与环境

Plain silicon grating reveals a hidden 'twist' in light from electron beams

In 1953, two physicists showed that an electron beam skimming past a grating emits light whose color depends only on the electron's speed and the grating's spacing. Known as Smith-Purcell radiation, this phenomenon has become a useful tool for building compact, tunable light sour

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