双极性开关型霍尔传感器则无须判别磁体极性，具有很大的灵活性和方便性。
Bipolar Hall Switch Sensor magnet polarity is no need to distinguish, with great flexibility and convenience.
光致极性和分子结构的变化使偶氮衍生物作为可逆的分子开关器件得以普遍应用。
The photoinduced changes in polarity and molecular structure have led to widespread application of azobenzene derivatives as reversible molecular switch devices.
介绍了绝缘门极双极性晶体管（IGBT）的基本结构、工作原理、开关特性，以及在焊接逆变器中的应用。
The paper introduces the basic structure, working principle and switching feature of IGBT and its application to the converter used for welding.
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