Abstract Vibration energy harvesters (VEHs) can transform ambient vibration to electricity and have been widely investigated as promising self-powered devices for wireless sensor networks, wearable sensors, applications of a micro-electro-mechanical system (MEMS). However, the is always too weak hinder high conversion efficiency. In this paper, integrated frame composed piezoelectric beams mech...

a survey was conducted of physicians in practice, to determine the criteria that would lead the study of a particular condition to be an important component of clerkship training in internal medicine. four such criteria were suggested: the prevalence of the condition in practice, the urgency with which it requires attention, the severity in terms of morbidity and mortality and the cost effectiv...