Abstract: An interface field optimization technique is presented for designing planar, periodic refracting metasurfaces comprising three admittance sheets on dielectric substrates in TM polarization.

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This all-inclusive refractor is best for observing planets and the moon, but still able to give skywatchers some glimpses of deep-sky objects.

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Xanax and Valium both work to reduce anxiety symptoms by enhancing the effects of GABA in the brain. Side effects are similar and include dizziness, drowsiness, and dry mouth. Xanax has a higher risk ...