如果碳纳米管阴极附近的真空度太低，将产生打火、气体电离、离子回轰阴极等问题，将导致阴极发射电流的迅速衰减。

If the vacuum near the cathode is too poor, it will generate spark, gas ionization and ion bombardment on cathode, which can result in a fast attenuation of the emission current.

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通过对大气衰减系数、放大器放大能力、光电二极管接收灵敏度等一些主要参数进行分析，建立了激光模拟系统的数学模型。

Secondly, the mathematical model of the laser simulation system is built upon the atmosphere attenuation, the amplifier extent, receiving-sensibility of photoelectric diode and other preferences.

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经过弯管后水击压力有不同程度的衰减。

The water hammer pressure attenuates after the angle pipe.

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