Pulse width modulation is used to reduce the total power delivered to a load without resulting in loss which normally occurs when a power source is limited by a resistive element.
脉宽调制技术是用来降低总功率交付给了负荷，没有造成损失，这是通常发生时，电源是有限的，由电阻芫件。
Wireless powering is a new technique, which can make power transferred to load without any physical connection.
无线供电是一种新兴的技术，可实现近距离、无接触电能传输。
High power utilization, low consumption without load, save energy.
电源利用率高，空载损耗小，节约能源。
The results also indicate that index for swelling-shrinkage property has reduced, swelling ratio without load is 2 %-3 % and swelling power is 5 % of those without modifying.
各项胀缩性指标较改性前也有大幅度下降，无荷膨胀率约为改性前的2%，膨胀力约为改性前的5%；
The results also indicate that index for swelling-shrinkage property has reduced, swelling ratio without load is 2 %-3 % and swelling power is 5 % of those without modifying.
各项胀缩性指标较改性前也有大幅度下降，无荷膨胀率约为改性前的2%，膨胀力约为改性前的5%；
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