Experimental results and theoretical work show that the mechanisms of the direct charging and the corona charging are respectively the tip effect and collision effect.

由试验结果和理论分析得到直接荷电法的机理是尖端效应，电晕荷电法的机理为碰撞荷电。

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Photo Tip: Try slowing down the shutter when you shoot water-this always adds an interesting effect.

图片提示：当你拍摄水的时候，请你尝试放慢快门速度，它会为你添加有趣的效果。

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Photo Tip: Shooting into the light, or "backlighting," will add a halo effect to hair and clothing and other details of the subject.

摄影小贴士：正对光线进行拍摄(背光拍摄)会为头发、服装及其他细小物件添加晕轮效果。

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Dr. Marion Moses, director of the Pesticide Education Center in San Francisco, California, notes that at least one commonly used class of pesticides, organophosphates, can adversely affect the heart -- and this effect is just the tip of the iceberg.

CNN: Children face danger in the schoolyard grass from pesticides

At about 1, 000 volts this effect races away the more pointed the tip, the stronger the field becomes, and as more water molecules attach themselves to it, the tip becomes more pointed.

ECONOMIST: Atmospheric science: Fake flakes | The