Input for baroreflex analysis: which blood pressure signal should be used?

The baroreflex (BR) is an important physiological regulatory mechanism which reacts to blood pressure perturbations with reflex changes of target variables such as the heart period (electrocardiogram derived RR interval) or the peripheral vascular resistance (PVR). Evaluation of cardiac chronotropic (RR as a target variable) and vascular resistance (target PVR) BR arms was in previous studies mainly based on the use of the spontaneous variability of the systolic or diastolic blood pressure (SBP, DBP), respectively, as the input signals. The use of other blood pressure measures such as the mean blood pressure (MBP) as an input signal for BR analysis is still under investigation. Making the a…

UV parametric generation via quasi-phase-matching in Lithium Tantalate waveguides

Design and Validation of a Dynamic Inductive Power Transfer System for EV Battery Charging

In this paper, a Dynamic Resonant Inductive Power Transfer (DRIPT) System for the Electric Vehicle (EV) battery charging is proposed. In particular, the aim of the work is the general design of the whole system and its validation, with particular attention to the power electronic converters and their control. For the transmitter side, a DC/AC converter is used. It is controlled through the phase-shift technique and supervised by a Zero Phase Angle detection algorithm to ensure the maximum power transfer. For the receiver side, a double conversion stage, consisting of a diode rectifier and a controlled buck converter, is provided. The system is then simulated to verify its proper design.

Photoplethysmograhic sensors, potential and limitations: Is it time for regulation? A comprehensive review

Healthcare is expected to increasingly shift care out of inpatient settings thanks to wearable monitoring systems. Photoplethysmography (PPG) is an optical technique already integrated into wrist-worn commercial products which presents significant advantages in terms of cost and dimensions. PPG-based devices, despite their ability to detect multiple cardiovascular parameters, are affected by several influencing conditions that depend both on technological or environmental variables, and on intra- and inter-subject variability that influences the whole measurement chain and reliability, hindering an objective characterization of PPG devices. Plus, the lack of standardization for data collect…