dfn怎么记

The morphology of online sampled blends were observed with the help of Scanning Electron Microscope ( SEM). Some parameters, such as average particle diameter d, particle diameter distribution width σ, mass center distance D and fractals dimension DfN were also calculated from SEM photos.

用扫描电镜观察在线取得的样品的相结构，同时得出各结构参数：分散相平均粒径d、分散相粒径分布宽度σ、分形维数DfN等。

The cortico-dorsal funicular nuclei ( DFN) and dorsal funicular nuclei-spinal cord projections were studied with the HRP and modified Nauta methods in 35 cats.

用Nauta法和HRP法研究了35只猫的皮质后索核投射和后索核脊髓投射。

The projections of the DFN to the spinal cord originate mainly from large and medium sized cells in the intermediate ventral part in DFN.

投向脊髓灰质的后索核纤维主要发自核中间腹侧部的大、中型三角、多角和梭形细胞。