The test methods of effective opening size are studied after analyzing the hydraulic parameters of synthetic staple fibers needling nonwoven geotextiles.
通过对短纤针刺非织造土工布水力特性试验结果的分析,着重探讨有效孔径试验方法的问题。
New measurement method of the numerical aperture of optical fiber;
一种新的光纤数值孔径测量方法
Measuring numerical aperture of microscope by projection method;
用投影法测量显微镜的数值孔径
Measuring the numerical aperture of fiber by improved spectrometer;
用改进的分光计测量光纤理论数值孔径
testing method for apparent opening size of geotextiles
土工布有效孔径测定法
Its practicality effective aperture ratio has been improved to about92.8%, consequently the concen-tration efficiency of microlens array is increased.
其实测有效孔径比可达到92.8%极大提高了微透镜阵列的聚光效率。
Determination of effective aperture and estimation of truncation energy in synchronous three-channel optical system for laser warning
同步三通道激光告警光学系统有效孔径的确定及截获能量的估算
A Brief Explanation of Air Actuated DTH Hammer Drilling Efficiency
空气潜孔锤钻进是提高钻进效率的有效途径
Effects of perforated polythene fresh-keeping bags of different diameters on vegetables
不同孔径有孔聚乙烯保鲜袋包装蔬菜的保鲜效果
Antenna efficiency of an aperture-type antenna
孔径型天线的天线效率
guide twist drill
有导径的深孔麻花钻
Three-dimensional Non-linear Finite Element Analysis of the Pile-Group Effect for Large-diameter and Super-long Pile-Group Foundation;
大直径超长钻孔灌注桩群桩效应的三维非线性有限元分析
Defining Efficient Influence Radium of Drilling Hole Gas Extracting by Using Gas Flow Theory
采用瓦斯流场理论确定钻孔瓦斯抽采有效影响半径
Study on Gas Storage Law and Effective Extracting Radius of Borehole in Deep Coal Seam
深部煤层瓦斯赋存规律及钻孔抽采有效半径研究
Finite Element Analysis on Hole Radius of Circular-Web Opening Steel Beams
圆形开孔梁中开孔半径的有限元分析
high efficiency drilling system for small and deep hole
高效小直径深孔钻削系统
Numerical Simulation for Influence of Radial Angle on Gas-film Cooling Effectiveness
气膜孔径向角角度对冷却效率的影响
It has advantages of pore size, air-distribution uniformity, high oxygen-transfer efficiency, anti-corrosion, high rigidity, low cost, and long service life etc.
具有孔径小、气流分布均匀，传氧效率高、耐腐蚀、刚性强，成本低、寿命长等优点。
The effect is not apparently when using methods of large-diameter barrels,cementation and so forth during branching drilling in Cenozoic loose beds.
采用粗径岩心管、水泥封闭等方法在新生界松散层中人为叉孔有时效果不太明显。
There is a pin hole between outside shell and output axis.
外套与输出轴的径向有一个插销孔。
a compound camera lens with a relatively high aperture.
带有相对高孔径的照相机复合镜头。
a short musket of wide bore with a flared muzzle.
一种短式的宽口径的具有散孔的步枪。