The electromagnetic shielding effectiveness of aluminum foam was measured as a function of cell size and thickness when the frequency is between 50 and 1050MHz.
采用加压渗流法制备不同特征参数的开孔泡沫铝,在50~1050MHz电磁波频率内研究了开孔泡沫铝的屏蔽特性,并探讨了泡沫铝的孔径和厚度对其电磁屏蔽性能的影响。
The open-cell aluminum foams have been produced by pressure infiltrating process,and the structural parameters such as cell size and porosity of the aluminum foams were controlled by adjusting process parameter.
本文采用加压渗流方法制备开孔结构的泡沫铝,并通过调整工艺参数改变泡沫铝的孔径和相对密度。
The effects of the structural parameters such as cell size and porosity on the electrical conductivity of aluminum foams were investigated in this paper.
研究了孔隙率及孔径的变化对开孔泡沫铝导电性的影响。
The Measurement of Pore Diameter Based on IMAQ;
基于IMAQ的孔径检测
Study of Textile Artificial Vessel Wall Water Permeability and Pore Diameter Distribution
纺织基人造血管管壁水渗透性和孔径分布研究
The porosity,pore diameter and solubility of ceramsite filter made by these two methods were analyzed and compared.
对这2种方法制备的陶粒滤料的孔隙率、孔径和酸碱可溶率等指标进行了分析比较。
Study on determining pore size and pore size distribution of ultrafilratim mermbrane by liquid-liquid disqlacement method;
液-液置换法测试超滤膜孔径及其分布的研究
Poly－DL－lactide（PDLLA）with different pore sizes to repair the radial defect in rabbits;
不同孔径的国产PDLLA填充材料修复骨缺损实验研究
Measurement of pore size of geotextile under different pressures;
无纺土工织物孔径测量技术
Influence of detector’s aperture on metrical precision of ring-down cavity;
探测器孔径大小对衰荡腔测量精度的影响
Research on the ultra precision measuring method of diameter of small aperture;
小孔径超精测量方法的研究
Diffraction of Gaussian beam by a rectangular aperture;
高斯光束照射下与矩孔相关的孔径衍射
The drawbacks of the current method for calculating the hole diameter according to the unfolded principle of the bent part are analyzed.
根据塑性变形体积不变原则和翻边变形的力学特点,探讨了翻孔预孔孔径的计算方法,分析了现有的按弯曲件展开原则计算翻孔预加工小孔孔径方法的欠妥之处,提出了一个更合理的计算公式。
And through processing tests on the size of the hole pierced before burring, the reference values for the punch size, the hole diameter before burring and the burring height were provided.
用翻孔冲压工艺取代上盖的焊接工艺 ,采用翻孔模可提高工作效率和表面质量 ,介绍了翻孔模的模具结构及其工作过程 ,并通过翻孔预冲孔尺寸的工艺试验提供了凸模尺寸、翻孔前孔径及翻孔高度的参考
Its basic principle is combining uttrasonic distance measuring theory with comprter and comprehensive scientific monitoring technology,to execute quality inspection of large diameter foundation pile hole ;that is to monitor hole diameter,inxlination and the thickness of downhole cuttings sediment.
其基本原理是利用超声波测距原理，结合计算机等综合性科学检测技术，实现大口径基桩孔的成孔质量检测，即检测其孔径、孔斜和孔底沉碴厚度。
condenser aperture
聚光镜孔径;聚光镜孔径;聚光器孔径;聚光器孔
diameter and number of hole
喷嘴量孔孔径及数目
large core high numerical aperture fiber
大芯径大数值孔径光纤
The diameter of the objective of a telescope.
孔径望远镜物镜的直径
ultra-rapid lens
甚大光强[相对]孔径物镜
scanning aperture photomultiplier
扫描孔径光电倍增管
electronic boresight scanning
电子孔径瞄准器扫描
variable hole fruit grader
可变孔径的水果分级机
maximum opening diameter without reinforcement
不另行补强的最大孔径
L-band synthetic aperture radar
l波段合成孔径雷达
ratio of the pole spacing to the bore diameter of the pole pieces
极靴的间距与孔径比
filled aperture radio telescope
连续孔径射电望远镜
aperture synthesis radiotelescope
综合孔径射电望远镜
object lens of large relative aperture
大相对孔径(摄影)物镜
short focal length (high aperture) lens
短焦距(大孔径)透镜
testing method for apparent opening size of geotextiles
土工布有效孔径测定法
Antenna efficiency of an aperture-type antenna
孔径型天线的天线效率
Co-Phasing Error Study of the Sub-apertures' for Optical Sparse Aperture System
光学稀疏孔径成像系统子孔径位相误差研究