Abstract: This paper presents an integrated Bluetooth Low Energy (BLE) planar inverted-F antenna (PIFA) sensor designed for noncontact liquid level detection using microwave sensing in the 2.4 GHz ISM ...
Tourists visit the Mingsha Mountain and Crescent Spring scenic spot in Dunhuang city, Northwest China's Gansu province, May 31, 2025. [Photo/Xinhua] LANZHOU -- Crescent Spring, a famed desert oasis in ...
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