电导率断点主要受传播频率的影响，而与巷道横截面尺寸和极化方式几乎无关。
The breakpoint is determined mainly by the frequency and nearly independent of the transverse dimensions of tunnels and the polarization modes.
研究结果表明：纳米量级尺寸是多孔硅膜的一个重要特征。估计多孔硅硅柱横截面直径在几到十几纳米之间。
It is shown that the quantum dimension with nanometer order size is an important structural characteristic of porous silicon films.
粉末通过具有扁平横截面的管道（5）分配，以使聚结的粉末散开并用于产生具有细微颗粒尺寸的喷羽流（3）。
The powder is dispensed through a duct (5) with a flat cross section to deagglomerate the powder and to generate a spray (3) with fine particle size.
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