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DALLAS — An area stretching from Texas to Tennessee braced Wednesday for the possible arrival of freezing rain and snow even as some other parts of the U.S. hit by the plunging polar vortex this week ...
‘Metalasers’ have been developed using metasurfaces comprising nanodisks, each with an off-centre hole. By changing the rotation angle of the nanodisks’ holes, the wavefront of the metalaser’s ...
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