易化扩散是膜蛋白介导的被动扩散。物质通过膜上的特殊蛋白质(包括载体、通道)的介导、顺电—化学梯度的跨膜转运过程,其转运方式主要有两种:一是经载体介导的易化扩散。二是经通道介导的易化扩散。易化扩散属于被动转运,被动转运的主要特点是:转运物质过程的本身不需要消耗能量,是在细胞膜上的特殊蛋白的“帮助”下,顺着浓度梯度或电位梯度进行的跨膜转运,是一个“被动”的过程。
整个燃烧过程优化的目标就是减少预混合燃烧,促进扩散燃烧。
The aim of combustion process optimizing is to decrease pre-mixed burn proportion and to improve diffuse combustion.
经皮给药是将药物贴敷在皮肤外表面,依靠被动扩散或促进扩散使药物通过皮肤进入皮下毛细血管。
TDD is the method that patching the drug on the skin, the drug molecules permeating through the skin into the subcutaneous capillary vessels by passive diffusion and enhanced diffusion.
脉冲加压扩散焊能促进扩散过程,减少金属间化合物的形成,改善其分布,是一种较有前景的扩散焊方法。
Diffusion bonding under pulsatile pressure is an ideal bonding method, which can accelerate diffusion, reduce the amount of intermetallic compound and improve its distribution.
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