One of the most important of these is a fluctuation in the density of electrons and other electrically-charged particles in the ionosphere.
最重要的一点是在电离层的电子和其他带电粒子的密度是波动的。
The two laser beam system has been used to measure the relative density of linen dust, with the feature of wide measurement range, good sensitivity and restraining the intensity fluctuation noise.
本文采用双光路激光系统，对亚麻尘的相对浓度进行了连续测量，具有测量范围宽、 灵敏度好、 抑制激光强度起伏噪声等特点。
The liquid superheat limit and critical radius of bubbles in homogeneous nucleateboiling are determined in the present paper by using density fluctuation theory of statistical theomodynamics.
利用统计热力学密度涨落理论确定了均质沸腾时液体的极限过热度及汽泡的临界半径。
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