孔径

The calculated results show that there is an obvious difference between the interfacial tension of the bulk liquid nitrogen and that of the adsorbed liquid nitrogen film on most of nonporous so.

根据表面热力学原理，本文导出从无孔固体吸附氮气的等温线计算其表面上吸附生成的液氮膜界面张力方程式；还导出计算固体中圆筒形间隙孔径方程式。

Organic substances (diethylene glycol, glycol methyl ether and methyl ethyl ketone) were used as nonsolvent additives and N-methyl-2-pyrrolidone used as a solvent in membrane preparation. The effects of PPESK concentration, the type of additives and the NSA concentration in casting solution on the morphology and performance of the PPESK hollow fiber ultrafiltration membrane were systematically investigated.

以PPESK为膜材料，NMP为溶剂，水为凝胶剂，选用乙二醇甲醚、一缩二乙二醇和丁酮为非溶剂添加剂，系统研究了聚合物浓度、添加剂种类和含量对PPESK中空纤维超滤膜结构和性能的影响，制备了一系列具有不同孔径和通量的中空纤维超滤膜。

The results showed that the NPG with a smaller pore size was a better carrier for the laccase immobilization.

发现小孔径更有利于对该漆酶的固定化。

Nanoporous gold with different pore sizes was prepared by controlling the etching time of Au/Ag alloy with concentrated nitric acid and annealing. Scanning electron microscopy and a nitrogen adsorption technique were used to characterize the NPG.

以Au/Ag合金为原料，通过控制浓硝酸的腐蚀时间再辅以退火处理得到了不同孔径的纳米多孔金，利用扫描电镜和N2气体吸附仪对孔性质进行了表征。

When the measuring system of point scanning confocal microscope is designed,the parameter of object lens is important because the measuring precision of the system are determined by the numerical aperture of lens.

在设计点扫描激光共焦显微镜测量系统时，物镜参数的选择是至关重要的，因为它的数值孔径大小直接影响着系统的测量精度。

At first, exposure dose distribution model of polar laser direct writing was established , and the cause of radial shift was analyzed. And then, the linewidth broadening model and radial shift model were established corresponding to object lens with numerical aperture 0.5, and the coupling relationship between linewidth broadening and radial shift was analyzed.

首先推导了极坐标激光直写的曝光量分布模型，分析了径向漂移产生的原因，然后针对数值孔径为0.5的光刻物镜建立了线条展宽模型和径向漂移模型，并分析了线条展宽和径向漂移的耦合关系，在此基础上分别建立了线条展宽补偿模型和径向漂移补偿模型。

Its R/W device has a single laser source and a single object lens. The wavelength of laser source and the numerical aperture of object lens are between those of CD and DVD or same as those of CD.

此种光学记录媒体的读写装置具有单一激光光源以及单一物镜，激光光源的波长和物镜的数值孔径介于CD与DVD规格之间，或与CD规格相同。

Oilcan is a kind of typical rigid target with big backscattering coefficient, which takes on point figure if the resolution of SAR image is not very high; these point targets to be recognized gather together, and form a target region with some distribution area; the center of the region appears as a beeline, and the speckle noise appears scattered, therefore, considering the different grey distributions between point target and speckle noise region and the space geometry distribution, these point targets can be recognized by this algorithm.

由于在高分辨率情况下，合成孔径雷达图像中油罐个体的散射分别体现为由若干高亮度点围成的椭圆，待识别油罐目标的模糊边缘呈不连续的椭圆状，因此从二值化后的SAR图像中识别出拟目标的不连续边缘，判断其是否满足目标边缘特性来识别出最终结果，采用该方法解决了这类高分辨率下椭圆状目标的识别问题。本文运用了基于Gauss核函数支持向量机的SAR图像典型目标识别方法。

SEM results indicate that the diameter of monodisperse polystyrene latex particles is 317nm, PS latex particles array orderly on the colloidal crystal balls, and surface of inverse opaline balls presents ordered pores.

结果表明，改性PS乳胶粒呈单分散性，粒径为317nm；肢体晶体微球表面PS乳胶粒排列有序；有序大孔SiO2微球表面呈有序多孔，其孔呈六边形，孔径分布均一，约为200nm。

The effect of the roasting temperature on the properties of filter material such as pore size distribution,specific surface area and open porosity rate was investigated.

研究了焙烧温度对滤料孔径分布、比表面积、显气孔率等性质的影响。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。