The researchers analysed the sizes and structures of ash particles using a variety of techniques, such as atomic force microscopy, scanning electron microscopy and X-ray diffraction.

研究人员使用不同的技术研究了火山灰颗粒的尺寸和结构，例如原子力显微镜、电子扫描显微镜和X射线衍射。

youdao

The effects are also quite size-dependent, so they might also be useful for sorting particles of different sizes.

因为牵引效果是与尺寸有关，所以这些装置在分类粒径不同的粒子这一方面也可能会有用处。

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For particles of different sizes, he says his mechanism might be in play; for identically sized particles, the new model might explain it.

对于大小不一的微粒，他认为自己的理论是行得通的；而对于有着相同大小的颗粒，则可以利用Herrmann的新模型来进行解释。

youdao

Matt Loxham, a medical biologist at Southampton University, collected minute dust particles of different sizes from at an underground train system in an unnamed European city.

BBC: Railway tracks

All sizes of particles they collected contained a lot of iron - up to half of their weight.

BBC: Railway tracks