Abstract: We describe an evaluation of photoplethysmography (PPG) signals with two wavelengths channels (infrared and red) using a wrist-worn sensor for the estimation of heart rate variability (HRV) ...

SAN FRANCISCO (KRON) — Fifteen people were injured after a San Francisco cable car came to an abrupt stop around 3:09 p.m. at 1351 California St. between Leavenworth and Hyde streets, the San ...

Abstract: In this article, we propose and demonstrate a novel corrosion-resistant, embeddable open-end coaxial cable soil moisture sensor. This microwave resonator is constructed using two reflectors ...