孔径

Extracting optical aperture synthesis observation objective fourier information based on least-squares approach［J］.

基于最小二乘法准则的光学综合孔径观测目标傅里叶信息提取［J］。

Based on the Fresnel diffraction integral and the complex Gaussian expansion for the hard-edge aperture function, a simple and analytical expression for calculating the diffraction field distribution of an apertured lens is presented.

基于菲涅尔衍射积分和将硬边孔径函数展开成有限项复高斯级数方法推导出了计算透镜衍射光强分布的解析表达式。

For that case, most manufacturers choose a 2-μm frit.

大多数生产厂家选择的筛板孔径是2-μm。

Synthetic aperture ladar: fundamental theory, design equations for a satellite system, and Laboratory Demonstration .

合成孔径激光成像雷达中非线性啁啾逐一扫描滤波校正算法的仿真与分析。

It is stated systematically in the thesis the methods theories and measuring principle of all kinds of geostress determination technology. In particular the four methods recommended in 1987 by the committee of test method of the International Society of Rock Mechanics, i.e. two over-coring methods of strain relief in boreholes, hydraulic fracturing method and stress furbish measurement which measures the surface stress.

本文较为系统地、全面地介绍了当前国内外通用的各种地应力测量方法的理论、测量原理；特别就国际岩石力学学会试验方法委员会于1987年推荐的4种地应力测定方法(钻孔孔径变形测量法、钻孔孔壁应变测量法、水压致裂法以及测量岩体表面应力的应力恢复测量法)作了较为详细的叙述。

The alumina carrier has medium pore size of 25-35 nm, pore volume of 1.2-2.0 ml/g, and specific surface area 200-350 sq m/g, and is prepared through mixing ammonium aluminum carbonate and one kind of nitrogen containing compounds except acid, forming and roasting.

其中所述载体的中值孔径为25-35纳米，孔容为大于1.2至2.0毫升/克，比表面积为200-350米 2 /克，所述载体由包括将一种碳酸铝铵与一种除酸以外的含氮化合物混合、成型并焙烧的方法制备。

This system can change the synthetic wavelength chain according to the distance to be measured. The inphase state of the interference signals, which is difficult for phase measurement, can be avoided by changing the wavelength freely. In addition, this system can realize the dimension calibration between the workpiece and the gauge block at a shortest measuring chain.

该测量系统可以根据待测距离选择合成波长链完成由粗测到精测的过程、通过波长的调谐能够避免零相位的测量，并在测量链最短的情况下实现了被测量和量块的直接比对，适用于孔径、平行平面间距的测量。

Design sug gestion about holes iameter and comparative anchorage length were proposed.

并对植筋时的钻孔孔径和相对锚固长度提出了设计建议。

His system, known grandiosely as a "large aperture scintillometer", consists of a laser on one side of a field, a telescope on the other, and a lot of clever computing to interpret what the telescope sees.

他的这套系统有一个响亮的名字："大孔径闪烁仪"。这套系统的构成如下：农田的一边设置一个激光仪，另一边设置一个望远镜，还有许多用于数据分析的智能计算机。

The results show that MCM-41 with Si ∶KG-*3〗Al=100 exhibits a good catalytic activity and selectivity to guaiacol. This may mainly be attributed to the relative large pore size and the presence of suitable amounts of weak acid on the surface of catalyst.

结果表明， Si∶Al=100的MCM-41材料表现出较好的催化性能，样品较大的孔径和一定量弱酸中心的存在对反应有利。

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。