Several kinds of calculating methods of virtual section are analyzed and compared on the basis of measuring wells in four directions by ultrasonic theory,and the experimental results are presented,which has a certain value of reference for improving testing precision.
对于大直径钻孔的成孔质量检测,孔径、孔斜、偏心距是衡量井筒质量的重要参数,在利用超声原理对井筒进行四向测量的基础上,分析比较了几种有效断面的计算方法,并给出实验结果,对提高测试精度有一定参考价值。
Inquiry into effective area of diaphragm of gas decompressor;
气体减压器膜片有效面积探讨
Measuring and studying the effective area of single mode fibers by the variable aperture technique;
用可变孔径法测试研究单模光纤的有效面积
It is insufficient to describe the flowrate characteristic of pneumatic circuit completely only by using one characteristic parameter such as effective area S.
用一个特性参数（如有效面积S值）不能完整表达回路的流量特性用两个特性参数（壅塞流态下的有效面积S值和临界压力比b值）便能完整而科学地表达它气动回路是由许多元件组成的已知每个元件的S值和b值，便可计算出回路的S值和b值本文介绍了这种方法的原理实验结果表明，理论计算值与实验结果吻合很
The specific surface area of copper in the Cu Zn Al catalyst was determined by pulse chromatography using N 2O as chemical adsorption medium.
以Ｎ２Ｏ为化学吸附介质，在２０℃下采用色谱脉冲法测定Ｃｕ－Ｚｎ－Ａｌ催化剂中活性铜的有效表面积。
percentage of effective grate area
炉篦有效面积百分率
The Effective Area of Triangular Lattice Photonic Crystal Fiber
基于有限元法的三角格子光子晶体光纤有效面积数值模拟分析
Practics of Transforming End Seals of 300m~2 Sintering;
300m~2烧结机机尾两道密封改为一道密封增加烧结有效面积的实践
Appraisal of Useful Measuring Area Uncertainty to 0.05 Class Piston Manometer
0.05级活塞压力计活塞有效面积测量不确定度评定
effective inside surface of kiln shell
窑胴体有效内表面积
active area of solar cel
太阳电池的有效光照面积
In addition, 5,608 irrigation areas were completed, with the coverage of effectively irrigated farmland totaling 22.06 million hectares.
建成灌区5608处，有效灌溉面积2206万公顷。
The Change of Effectively Irrigated Land Area in China during the Past 20 Years;
近20年我国有效灌溉面积动态分析
A total of 1.1 million hectares of land were converted into farmland with effective irrigation system. Another 1.8 million hectares of land were guaranteed by water-saving irrigation systems.
全国新增有效灌溉面积110万公顷，新增节水灌溉面积180万公顷。
Over 900,000 hectares of land were converted into farmland with effective irrigation system, another 1.40 million hectares of land were guaranteed by water-saving irrigation system.
全年新增有效灌溉面积90多万公顷； 新增节水灌溉面积140多万公顷；
When the pad area is greater than66 percent of the aperture wall surface area, the probability of achieving efficient paste transfer is increased.
当焊盘面积大于孔壁表面积的66%提高锡膏有效转移的可能性。
This technology can make efficient panicle of unit-acreage increased, empty-percent creased.
该技术可使单位面积有效穗数增加、空秕率减少。
Taking Effective Measures to Promote Double Certificate System;
采取积极有效措施 全面推进“双证书”制度的实施
Determination of Efficient Delivering Material Ratio in Interphase Area for High Gravity Reactor;
超重力反应器有效传质比相界面积的测定
Field Emission Characteristics and Effective Emission Area of Carbon Nanotube Films
碳纳米管薄膜的场发射及其有效发射面积
Study on Method in Testing Combustor Injector by Calibrating Effective Area
通过标定有效截面积检验喷注器的方法研究
The method could well prove effective in defining broad areas of uranium favourability.
该法在圈定大面积的铀成矿有利区方面可能是有效的。
theoretical waterflood areal sweep
理论注水面积波及效率