back diffusion

Conclusion: The phospholipids form the constructure with or without binding the other component such as mucin, and resist the back diffusion of H+ from gastric lumina, ie the gastric mucous barrier.

结论：磷脂在胃粘液层中与粘蛋白等其他成分一起或单独形成结构，阻碍胃腔内H＋逆弥散，构成胃粘液屏障作用。

Studying of Helium mass-spectrometer leak detector with back diffusion

逆扩散型氦质谱检漏仪的研究

The Microsegregation Mathematical Model for Binary Alloy Based on Coarsening and Back-diffusion

基于枝晶粗化和反向扩散的二元合金微观偏析数学模型

At the same time electro-osmotic drag, back diffusion, hydraulic permeation and net water transport coefficients and water content in the membrane increased rapidly, while proton transport resistance decreased, which improved the performance of PEM fuel cells.

增大电池的操作压力，电渗拉力系数、反扩散系数、水力渗透系数、水净迁移系数和质子膜的含水量增加，而质子传递阻力下降，使燃料电池的性能得到了提高。

The main kinetic effects that can influence microsegregation were accounted for in the modeling including secondary arm coarsening, solid-state back diffusion, primary tip undercooling and variable diffusion coefficients according to temperature.

在显微偏析模型中考虑了树枝晶粗化、固相溶质逆扩散、枝晶尖端过冷、随温度变化的溶质扩散系数等影响显微偏析形成的动力学因素。

The liquidus and solidus in the mushy zone was calculated based on back diffusion and a database for multi-component steel with the thermal-physical parameters depended on composition, temperature and solid fraction.

该模型根据糊状区溶质传输和反扩散理论，基于变热物性参数，采用钢中多组元成分的百分含量计算液、固相线温度。

Results from the model show that at high current densities back diffusion of water from the cathode side of the membrane is insufficient to keep the membrane hydrated.

模型研究表明，在高电流密度下从膜阴极侧扩散回的水不足以使膜湿润。