孔径

Nowadays, the Eddy Covariance system and the Large Aperture Scintillometer are the main instruments measuring surface fluxes. The former is point observation and can observe hundreds of meters and the latter can observe area average fluxes in the scale of hundreds of meters to ten kilometers.

目前应用较为广泛的通量测量技术有涡动相关仪和大孔径闪烁仪，前者是单点观测，观测范围通常只有几百米；后者近年来得到长足的发展，可以观测从几百米到十几公里尺度上的区域湍流通量。

Screen length,incline angle,and screen-aperture are the most important screen pa-rameters,which directly relate to the capacity and efficiency of the screen.

筛面长度、倾角和筛孔孔径是最重要的筛面参数，与筛分机的处理能力和筛分效率有着直接的关系。

The SEIDEL coefficients solved by wavefront fitting with Zernike annular polynomial and Zernike circular polynomial were compared.

比较对于不同遮拦比的环孔径波面采用Zernike环多项式拟合与采用Zernike圆多项式拟合求取SEIDEL系数的差别。

When the ratio of central obscuration is small, the circular polynomial with 9 terms could take place of the annular polynomial to solve the SEIDEL coefficients in some special situations.

在某些特殊情况下，对于中心遮拦很小的环孔径波面，可以采用9项Zernike圆多项式来代替环多项式进行拟合求取SEIDEL系数。

The effects of pore width, temperature, and pressure on density distribution in the channel direction and on self-diffusion coefficient were investigated and analyzed, and the radial distribution functions of water in micropores at different temperatures were calculated.

分别考察了孔径、温度和压力对水在孔道方向的密度分布和自扩散系数的影响，计算了不同温度下水的径向分布函数。

Fish eye lens is a kind of reversed telephoto lens having big relative aperture, large view angle and long back working length. Its view angle can reach 180 degree or even more so it can image object covering semisphere or larger than semisphere to limited plane.

鱼眼镜头是一种具有大相对孔径、大视场角和较长的后工作距离的反摄远镜头，它的视场角可以达到甚至超过180°，因此它能够将半球空域甚至超半球空域的物体成象在有限的象平面上。

The results show that the surface area, pore volume and pore distribution are the main factors for water vapor adsorption properties of sepiolite.

结果表明：影响海泡石吸湿性能的主要因素是其比表面积、孔容积和孔径分布。

Sepiolite is a kind of samdwich clay with high ion exchange ability, adsorption and surface area which makes it to be an excellent support for catalyst.

中文摘要：海泡石属于2：1型的层状天然粘土，具有较高的阳离子交换性、吸附性能和比表面积，本身具有一定的催化活性，是优良的催化剂载体，但其应用受到低热稳定性和孔径分布的限制。

Keywords polarization;polarimetric SAR;classification;projection index;wavelet-kernel estimation;Bootstrap estimation;sequential projection pursuit cluster model;projection pursuit wavelet learning network;mix

Article From 西北工业大学；计算机科学与技术博士论文 2007年度极化；极化合成孔径雷达；分类；投影指标；小波估计； Bootstrap估计；序列投影寻踪聚类模型；投影寻踪子波学习网络；混合Wishart模型

The results show that the amorphous PLGA fiber with porous structure (0.1-1.0 μm) is obtained by diluted solvent spinning method and the mechanical properties is affected by pressure and temperature. Bending strength and shearing strength of the samples increase firstly and then decrease with the increase of molding temperature and pressure. While the molding temperature is 160℃and the pressure is 105MPa, the PLGA materials possess optimal mechanical properties, bending strength, shearing strength and bending modulus 187.3 MPa, 100.0 MPa and 2.5 GPa, respectively. The mild temperature molding PLGA materials are desired to play a grate role in non-bearing internal fixation devices.

研究结果表明：非晶多孔结构的PLGA纤维可通过溶液沉析纺丝的方法获得，其孔径为0.1~1.0μm；压制压力和压制温度对材料的力学性能影响较大，材料的抗弯强度、剪切强度和抗弯模量均随着温度和压力的增大而先增大后降低；在压制压力为105MPa，压制温度为160℃时，试样的力学性能比较理想，此时，其抗弯强度可达到187.3MPa，剪切强度达到100.1MPa，抗弯模量达到2.5GPa，可望作为非承重部位骨折愈合内固定材料。

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。