The radiation frequency tunability of the relativistic klystron amplifier still depends on design of the extract cavity.

相对论速调管放大器辐射频率的可调性还取决于提取腔的设计。

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The results illustrate that the collisional absorption have a maximum value when the collision frequency is near the radiation frequency.

计算表明 ，当电磁波的频率接近电子碰撞频率时 ，磁等离子体对电磁波的吸收达到最大值。

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The Australian research focused on the thermal effects or specific absorption rate (SAR) of radio frequency radiation - a measure of its actual effects on brain tissue, whereas the earlier study simply looked at electromagnetic radiation levels.

BBC: Hands-free mobiles given safety boost

The result is far less low-frequency radiation.

ECONOMIST: Monitor

Interestingly, the movement includes many who still believe that the lower frequency radiation from power lines and electric appliances and motors also poses a cancer threat, in spite of the fact that 30 years of research has shown no effects.

FORBES: Do Cell Phones Cause Brain Cancer? The Diehards Cling Desperately To Opinion