The Waag ("weigh house") is a 15th-century building on Nieuwmarkt square in Amsterdam. It was originally a city gate and part of the walls of Amsterdam.

王 瑾王 志強(qiáng)王 艦王 Injection and detection of a spin-polarized current in a light-emitting diode
Fiederling, R. et al. Injection and detection of spin-polarized current in a light-emitting diode. Nature 402, 787-789
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