In addition, it is difficult for PMR to maintain good performance under severe operating conditions, such as the grid voltage containing the resonant-frequency harmonic and the grid voltage sagging.

However, there is a lack of simple and efficient tools for dealing with the kind of environmental vibrations, concerning simulation of the radiation of infinite boundaries; irregularities in soils, ...

Stretching may allow for greater joint movement and improve posture. Stretching may help release muscle tension and soreness and reduce the risk of injury. It may also help increase circulation ...