Density Functional Theory is a very useful theoretical method to study this kind of materials.

而密度泛函理论就是一种很有效的研究纳米器件的理论方法。

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Microstructure of this kind of materials is observed with SEM and its strength forming mechanism is discussed.

用SEM对其微观结构进行了观察，阐述了其强度形成机理。

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It has introduced the appearance and present status of nanometer material research. also the special properties of this kind of materials.

介绍了纳米材料研究的产生、现状以及这类材料的特性。

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Making this determination will also depend on what materials leaked from the test, which experts can use to understand what kind of a device was detonated and infer how it was designed.

NPR: NKorean Nuclear Test May Be Intelligence Windfall