Calcium is important in the physiologic process of muscle or nervous reaction, nervous impulsetransmission, heartbeat rhythm maintenance, blood solidification, cell coherence and so on.
在神经，肌肉应激，神经冲动的传递，心动节律的维持，血液凝固，细胞粘着等生理过程中，具有重要的意义。
2
This paper analyzes the structure and principle of high voltage DC transmission(HVDC)system, builds a model of 6-impulse bridge HVDC system and makes a emulate on it.
分析了高压直流输电（HVDC）系统的结构和原理，建立了一个6脉冲桥HVDC系统模型并进行了仿真。
3
The pulse interleaving technology is adopted to make the transmitter or receiver synchronize with the transmission and the reception of the impulse radio signal pulses.