Results did not reveal any significant difference between the two groups of regenerated nerves with respect to the total number , mean density and mean size of myelinated nerve fibers 结果显示：两组的再生有髓神经纤维在总数量，平均密度以及平均直径方面无显著性差异。
The morphologies of the samples were detected by the scanning electron microscope ( sem ) , showing that the zno micro rods are about thirty microns long with a diameter of 5 ( m 我们还通过简单的热氧化锌粒的方法制备出了zno微柱，微柱的平均直径为2 - 5 m ，长约30 m 。
The law how the controlling parameters , such as the pressure before injecting , total pressure of the gas , the survey distance to exit , affect the discharge coefficient and the mean diameter of the spray is analyzed 通过冷态试验,分析了液体喷注压降、气体总压等控制参数及测量位置对喷嘴流量系数、雾化平均直径的影响。
The numerical simulation is carried out and the sauter mean diameter and the axial and radial size distribution of droplet of round jets and annular jets were obtained . numerical results are in good agreement with experimental data 针对hy911圆柱形射流和环形射流，计算出雾化液滴sauter平均直径以及轴向和径向液滴尺寸分布，计算结果与实验数据吻合较好。
A good forest structure could improve the even degree and range of distribution obviously , and improve the porosity ; the fractal dimension ( fd ) and mean weight diameter ( mwd ) could sign the soil structure feature objectively 良好的林分结构能明显提高土壤粒径的分布均匀程度与范围，改善土壤孔隙状况；分形维数和重量平均直径能比较客观地表徵土壤结构特徵，是较为理想的土壤结构测定指标。
Nipple ( 3 ~ 4 times ) : nipple ' s mean diameter approximately is six to seven millimeters , long approximately seven to eight millimeters ; if sucks after the argument including making time , because the nipple rich soft elasticity , inflates extendable three to four times 乳头（ 3 4倍）乳头的平均直径约为六至七公厘，长约七至八公厘；若经口舌吸吮含弄时，由于乳头富柔软弹性，可伸长膨胀三至四倍。
Based on the processed images , we can do the further computerized quantitative measure of parameters including area , perimeter , integrated optical density , average diameter , shape factor , number of bifurcation and end points , etc . our self - developed and localized system has a reliable property and a high ratio of performance and cost proved by our experiment 对感兴趣区域内的目标自动测量参数，如：面积、周长、综合光密度、平均直径、形状因子、三叉点、端点等。与其它类似系统相比，本系统具有性能稳定，开发成本低，技术性能价格比高的优点，成为国内医务人员易于掌握与使用的医学应用系统。
This charged fiber can be directed or accelerated by electrical forces and then collected in mats or other useful geometrical forms . the diameters of electrospun fibers are in the range of tens of nanometers to several micrometers . in this paper , polyacrylonitrile ( pan ) nanofibers are made by electrospinning pan / dimethylformamide ( dmf ) and pan / dimethylacetamide ( dmac ) with adjusting the main process parameters including electrostatic voltage ( 20 ~ 50kv ) , sprinkler aperture ( 0 . 5 ~ 0 . 8mm ) , collection distance ( 15 ~ 25cm ) , solution concentration ( 6 wt % - 14 wt % ) 本文主要对聚丙烯腈( pan )二甲基甲酰胺( dmf ) 、 pan二甲基已酰胺( dmac )体系进行电纺丝，调节静电压( 20 50kv ) 、喷头孔径( 0 . 5 0 . 8mm ) 、接收距离( 15 25cm ) 、溶液浓度( 6wt 14wt )等过程参数，制得pan纳米纤维，纤维平均直径在200 1000nm ；详细分析了过程参数对纤维细度、形态等的影响，认为高聚物溶液浓度及静电压对纤维细度有决定性影响，其它过程参数如接收距离、喷射孔径、纺丝溶液温度、溶液电导率等的调整应以这两参数为基础进行。
The sample thickness declining , provided the number of nuclei per unit volume fix , the value of the avrami exponent n falls , but the values of vc and s almost do n ' t change . when the value of thickness reduce to the average diameter of entities , the turning point turn up after the course of crystallization has begun soon 当单位体积内晶核数目不变时，样品厚度h减小， n减小； v _ c和_ s值基本不变：当h降到小于等于体系内球晶的平均直径时，在结晶最初期，会出现一个初期转折点。
The fractal dimension of the mixed forests were lower than the pure forests and grassland , and the soil weight diameter of the mixed forests were higher than the pure forests and grassland , which indicated that the mixed forest had best soil structure property in stability infiltration and water - holding ; the soil total porosity and the soil noncapillary porosity were different greatly between forest types , but the soil capillary porosity had little differ 混交林分分形维数均低于单纯林与荒草地，土壤重量平均直径均高于单纯林与荒草坡，说明混交林土壤结构稳定性最好，土壤通透性较好，具有较高的水土保持功能；不同林分类型之间，土壤总孔隙度与非毛管孔隙度差异较大，而毛管孔隙度的差别较小。
