A System for the Comprehensive Quantification of Real-Time Heartbeat Activity

Heartbeat can reflect the dynamics of the heart control system, and it is also a commonly used index in health monitoring, exercise load calculation and psycho-physiological arousal quantification. This paper fuses three heartbeat measures, i.e. the running mean, the range of local Hurst exponents and the relative fluctuation, to construct a system that can automatically quantify the heartbeat activity both from its static aspect and from its dynamic aspect in a real-time manner. Experiments show that the system can reveal the heartbeat arousal difference between physically relaxed status and exercise-loaded status. When the affective heartbeat data in literature are quantified by this system, the results also show the capability of the system to illustrate psycho-physiological arousal.

A Uniform Magnetic Field Produced by Rectangular Coils

To produce a better uniform magnetic field along the direction of light propagation in studying magnetometer, a pair of rectangular coils are used instead of traditional Helmholtz coils. In this work, the magnetic homogeneity in the center of the rectangular coils is calculated and discussed theoretically. We measured the magnetic field distribution along the light propagation direction of the coils in experiment proving that the field has the relative fluctuation less than 1% in the range of 30cm along the direction.