结果表明，在起始的一定时间内，阴极有效发射面积随时间的增加而增大。

It is illustrated that the effective emitting area increase over time at the beginning of emission.

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讨论了薄膜与阳极间隔以及有效发射面积对碳纳米管薄膜场发射性能的影响。

Effects of the sample-anode distance(the interval between sample and anode) and effective emission area on the field emission characteristics of carbon nanotube films were discussed.

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并且研究了非晶碳薄膜的场发射特性，计算了薄膜的功函数、实际发射面积和发射点密度。

The field emission properties were studied, and the work function, actual emission area and density of emission spot were calculated.

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