查询词典 pinhole

Especially, it is found that there exists three types of relative permeability of water such as concave, convex to the water saturation ax and the reversed "S" pattern. The super-low permeability reservoir is sensitive to pressure, apparent with millipore undersaturation and water blocks. In this study, a new concept of irriducible undersaturation is brought up. And a new mode to describle the process of imbibition dynamics is used to reveal and confirm the mechanism of pinhole enveloping macropore as following: pendular ring of wetting phase gathers→it fills throat→it truncates nonwejting phase . The expression of pressure distribution and the equation of oil production are deduced under conditions of non-darcy linear seepage and non-linear seepage.

尤其发现水相相对渗透率曲线存在凹向、凸向含水饱和度轴及反S形三种形式；特低渗透储层的压力敏感性强，微孔隙的欠饱和及水锁效应显著，本文研究中提出欠束缚水饱和度的概念，引用一种描述渗吸动态即湿相液环聚集→充填喉道→截断非湿相的演化过程的新方法，更深刻地揭示和证明了&小孔包围大孔&机理；推导出了非达西线性渗流和非线性渗流条件下的压力分布表达式和油井产量方程。

Since photoemissive materials are very inefficient, the time that the pinhole has to look at the point source in order to collect enough electrons tends to make image dissectors rather slow digitizers.

由于光电发射材料效率是非常低的，要收集到足够的电波，解析器背后的小孔发光就为不得不依赖于图像的点源，这使图像解析器成了非常慢的数字转换器。

The pinhole is a useful refracting room accessory because it can provide an estimate of potential acuity with optical correction.

1小孔试片是验光室有用的附件之一，因为它能预计可采用光学矫正的潜在视力。

At the super-low permeable reservior sandstone of Fu and Yang in Daqing Oilfield, many pore throats exist a lot in the types of compacted and restored flakes and curved lamellas while the pore volume of micropore and the thin, compacted and shrunken throat that contribute little to flow take large scale in the total pore space. Thereof high filtrational resistance is caused by much trouble including high content of reservoir shale, serious sensibility to pressure at waterflooding, remarkable effects of undersaturation and water blocks in micropore. A method with laboratory experiment, theoretical confirmation and field application included was adopted to analyze the non-linear flow characteristics, to reveal the deep mechanism of pinhole enveloping macropore and to provide a new technology of improving the development effect. The outcomes aquired are as follows: Multiple cores with different low and super-low permeability were selected to perform seepage experiments by gas, water and oil. Three fields of flow were observed in the reservoir at different low and super-low core permeability. They are pseudo- elastic flow, transition flow and plastic creep flow. So the concept that there was no correlation of rocky absolute permeability with fluid properties that pasted itself was broken up. Two-phase seepage of water displacing oil in uniform super-low permeability shows that the two-phase seepage zone is narrow.

针对大庆油田扶、杨特低渗透油层砂岩孔隙喉道的大小和形态以压实再生型片状、弯片状喉道分布较广，压实、缩小型细喉道型，微孔不可流动的孔隙体积所占总孔隙体积的比例较大的特点；及储层泥质含量高，注水开发中压力敏感性强、微孔隙欠饱和及水锁效应显著，导致流体渗流阻力增大的问题，本文采用室内实验、理论推证和矿场应用相结合的方法，研究、分析了流体非线性渗流特征，更深刻地揭示出小孔包围大孔的机理及产生原因，并提供了改善开发效果的新的技术方法，取得如下成果：选择不同渗透率的低渗透、特低渗透岩心，进行了气、水和油单相渗流实验，揭示出当岩心渗透率不同时，油层内的流体呈现出拟弹性流变、过渡流变、塑性蠕变三种流变区，从而打破了岩心的绝对渗透率与通过岩心流体性质无关的观点；同类特低渗透岩心的水驱油两相渗流实验表明，两相渗流区较窄。

While a lens takes scattered beams of light and focuses them into a cone or ray it them projects on to film, a pinhole works by allowing such a small aperture that the beam coming in is quite small, and therefore remains relatively unscattered.

虽然镜头采取分散光束和重点成圆锥或射线是他们的项目，以电影，一个针孔的作品，让这样一个小孔径的光束将在相当小，因此仍相对

Product exterior need velvet not rough,Naught flow color 、 doff color 、 cheeking 、 bubbing 、 scratch 、 pinhole 、 color reviscid 、 uneven color 、 uneven color class phenomenon.

产品表面需光滑不粗糙，无流漆、脱漆、龟裂、起泡，碰伤、刮伤、针孔、粘漆、喷涂不均、光泽不匀等现象。

One kind of PCD boring tool and a fine adjustment boring bar,which are suitably used in precision finishing the surface of pinhole of combustion engine piston,are introduced.

介绍了一种适用于发动机活塞销孔表面精镗加工用聚晶金刚石镗刀和可微调刀具尺寸的精密微调镗杆，该镗刀和镗杆组合具有较高的加工精度和表面粗糙度精度以及调整方便、使用寿命长的特点。

On the other hand, if the rupture disk experiences a pinhole leak, the pressure in the space between the rupture disk and the relief valve can equalize with the system pressure.

另一方面，如果爆破片出现泄露，爆破片和安全阀之间的压力就等于系统压力。

Detection equipment gage dewpoint meter, infrared thermometer, the temperature and humidity device, adhesion tester, pinhole detector and salt detector, and so on.

五。 检测仪器测厚仪，露点仪，红外线测温仪，温湿度仪，附着力测试仪，针孔检测仪及盐份测定仪等。

Choose materials include the fuse block which content MgO within 5%~30%,magnesium material and other glaze material. Successfully gain the mat glaze with good facing and without pinhole bug.

阐述了镁质无光釉配料的改进方案，用含5%～30%MgO的熔块与镁质原料和其他釉原料配料，制备无光釉可获得饰面状态良好、无针孔缺陷的无光釉面。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。