Automatic control systems are the most efficient technology for reducing labor cost while improving work efficiency. Vector motion monitoring is indispensable for the normal operation of automatic control systems. Here, a self‐powered dual‐type signal triboelectric nanogenerator (DS‐TENG) is designed through integrating an alternating‐current TENG and a direct‐current TENG, which can monitor vector movement in real time based on pulse signal counts. As a result, the DS‐TENG avoids the shortcoming of traditional self‐powered sensors based on signal amplitude that is sensitive to the working environment, achieves a high sensing precision, and maintains stability after reciprocating motion of 500 000 cycles. Moreover, it realizes effective movement direction recognition by self‐powered switching of signal type in reverse movement. This dual‐type signal TENG exhibits high precision and automatic direction recognition in vector motion monitor and trajectory tracker, paving the way for the application of the self‐powered TENG sensor in automatic control systems in the future.

A Self‐Powered Dual‐Type Signal Vector Sensor for Smart Robotics and Automatic Vehicles

Fingerprint-shaped triboelectric tactile sensor

The fabrication of self-powered pressure sensors based on piezoelectric materials requires flexible piezoelectric generators produced with a continuous, large-scale, and environmentally friendly approach. In this study, continuous poly(vinylidene fluoride) (PVDF) sheets with a higher β-phase content were facilely fabricated by the melt-extrusion-calendering technique and a PVDF-based piezoelectric generator (PEG) was further assembled. Such a PEG exhibits a remarkable piezoelectric output performance. Moreover, it possesses prominent stability even after working for a long time, exhibiting potential applications for real-time monitoring of various human movements (i.e., hopping, running, and walking) and gait. This work not only provides the possibility of continuous and environmentally friendly fabrication of PVDF sheets with remarkable piezoelectric properties but also paves a new promising pathway for powering portable microelectronic applications without any external power supply.

Fabrication of β-Phase-Enriched PVDF Sheets for Self-Powered Piezoelectric Sensing.

High-performance Pt/Ti3C2Tx MXene based graphene electrochemical transistor for selective detection of dopamine.

Engineering an Integrated Electroactive Dressing to Accelerate Wound Healing and Monitor Noninvasively Progress of Healing

A multi-mode triboelectric nanogenerator for energy harvesting and biomedical monitoring

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Self-Powered Biosensors for Monitoring Human Physiological Changes

As an emerging training method, blood flow restriction training has been proved to promote the growth of muscle mass and strength. In recent years, it has been gradually applied in different populations. However, there are few studies on how blood flow restriction training affects muscle mass and strength in the elderly. The relevant literature is compiled and summarized in this study. Through the comparison of blood flow restriction training with traditional training methods and its application in the elderly, it shows that blood flow restriction training can effectively increase muscle mass and strength, prevent muscle atrophy, improve cardiopulmonary function, facilitate injury and postoperative rehabilitation, and intervene in related degenerative diseases as a training method suitable for the elderly,. The main mechanism of blood flow restriction training promoting muscle mass and strength growth is metabolic stress response, including muscle fiber recruitment, protein synthesis signal pathway activation, hormone secretion, etc., and is also related to cell swelling caused by pressure. At present, although the application of blood flow restriction training in the elderly population is increasing, there is a lack of personalized programs. In the future, more research on the dose effect and safety of blood flow restriction training is needed to develop more accurate personalized training programs.

Li Wu

Papers

A multi-mode triboelectric nanogenerator for energy harvesting and biomedical monitoring

Self-Powered Biosensors for Monitoring Human Physiological Changes

Application and progress of blood flow restriction training in improving muscle mass and strength in the elderly