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。

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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。

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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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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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