这也从分形理论的角度证明了在超塑性固相焊接头的形成过程中，焊接面各微区的焊合状态是非均匀性的。
It is proved by fractal theory that the welded state of every micro zone at welded surface is uneven in the formation process of isothermal superplastic solid-state welding joint.
基于微观相场动力学理论建立的微扩散方程，以原子占位几率和序参数描述合金沉淀过程的原子簇聚和有序化。
The nucleation of ordered phase is simulated by microscopic diffusion equation and the assumption of classical nucleation theory is examined.
评述了固相微萃取技术的特点、理论、表面涂层材料和方法的建立，以及与一些分析技术的联用。
The characteristic, theory, fiber coatings, method development of solid-phase microextraction and its coupling with other analytical technologies were reviewed with 59 references.
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