基于无源自供能电路的微型风能采集

针对工业外场环境下,传统电池供能方式存在污染环境及不易更换的问题,通过压电陶瓷将微型风能转换成电能后,直接为无线传感节点等微型电子设备供电,可以缓解这一问题。针对经典电路回收微型风能功率较低的问题,提出了一种无源自供能接口电路,可以更高效地采集微型风能。对电路进行了理论分析和Multisim软件仿真,仿真结果表明:设计的电路回收微型风能是经典电路的4倍左右。

Discussion on the problems and countermeasures in the financial management of the small and micro-sized enterprises

The survival problems are always the core problems of the small and micro-sized enterprises in our country, and the financial management, as the important key factor influencing the small and micro-sized enterprises, has more and more impact on its survival and development. However, the important problem existing presently is that the significance of the financial management is mostly ignored in the small and micro-sized enterprises, pursuing the short-term economic benefit blindly, which decreases the risk resistance of the small and micro-sized enterprises severely, so that a mass of the small and micro-sized enterprises with poor survivability and extremely short life cycle are occurred. This text analyzes the problems existing in the financial management of the small and micro-sized enterprises around the above several prominent problems, and discusses the corresponding suggestions to promote the sound development of the small and micro-sized enterprises in our country.