本文建立了开关式TIG焊电源的离散时域数学模型，分析了电弧引燃过程、引弧性能、电流波形特点和电弧稳定性。
The discrete time mathematical model of a switched TIG welding power source is established. The arc ignition process, its property, current wave form and arc stability are analysed.
因纺织品不具备阻燃性能而被引燃和蔓延，从而引起火灾的情况占了相当大的比例。
Fire spread by ignited textiles which lacking in flame resistance performance has accounted for a considerable proportion.
研究了塑料管式安全鞭炮的制备原理和制备工艺，分析了APC引燃剂的主要性能。
The preparation principle and techniques of plastics-tubing safety fireworks are introduced, and the main characteristics of APC is tested.
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