在6小时后，肝内出现最高的蓄积，表明与常规的核磁共振影像造影剂相比，纳米颗粒在血流中有一个延长的循环时间。
Maximum liver accumulation was found after 6 h, suggesting a prolongated circulation of the nanoparticles in the bloodstream as compared to conventional MR imaging contrast agents.
降低气速、提高颗粒循环速率，可以提高床内颗粒浓度，增加颗粒停留时间。
The solids density and solids residence time in circulating fluidized bed increase with increasing solids circulation rate and reducing gas rate.
大粒径粒子较小粒径粒子的平均循环时间短，大颗粒通过喷动区的次数大于小粒子，生长较快。
The motion tracks of large-size particles are shorter than that of little size ones, and accordingly the average circulation-time are shorter with less effects of aeration velocity.
应用推荐