筛管

Callose An insoluble polysaccaride that is laid down around the perforations in sieve plates, at wound or infection sites, and by growing pollen tubes.

callose 胼胝质：在植物筛管的筛域上存在的一种由不溶性的多糖物质积聚而形成的结构。

Then we found out that capillarity pump can save more energy and has simpler structure by analyzing the three measures, so we decided to use the capillarity pump. Finally we designed three different capillarity pumps on a liquid-vapor heat exchanger to do experiments. From the experimental data, we have concluded that this method is useful and practical.

接着根据系统工质和系统的条件，在实验中采用了两种毛细芯管芯，即组合铜丝网与分子筛管芯，然后我们制作了一个汽液热交换器，在一台风冷热泵冷水机组建立了试验台，并进行了相应的试验，通过试验可知该改进具有实际意义和应用前景。

The separation action of the gas anchor eliminates the effect of the gas on the subsurface pump and improves the efficiency of the pump; the gravity-type anti-gas device carries out gas-fluid separation by gas-fluid separating principle and chimney stack criterion: while the laser slotted screen pipe ensures the OD of sand in the fluid less than 0.05mm.

闭式气锚的分离作用消除了气体对抽油泵的影响，提高了泵效；重力防气装置利用液气分离原理和高烟囱原理进行液气分离，液流回流时间可达10 min，排气最高压差可达0.2 MPa；经激光割缝筛管过滤后的液体含砂粒外径小于0.05 mm。

This observation provided a strong support to the point that most leaves export the most of assimilates in the light time. Plasmodesmal densities between SE/CC, CC/PP, PP/PP and PP/BSC (bundle-sheath cell) decreased in weak light. Plasmodesmata were observed between CC/SE (nacreous-walled sieve element), PP/BSC in branch veins in normal light intensity, but not in weak light. Thus apoplasmic pathway may be the main mode of transport of assimilates in weak light, however symplasmic pathway may be the main mode of transport of assimilates in normal light intensity.

在筛管/伴胞、伴胞/韧皮薄壁细胞、韧皮薄壁细胞/韧皮薄壁细胞和韧皮薄壁细胞/维管束鞘细胞之间的胞间连丝密度都在弱光条件下下降，在正常光照强度下支脉筛管/伴胞和韧皮薄壁细胞/维管束鞘细胞之间可以观察到胞间连丝，而在弱光下几乎观察不到胞间连丝的存在，所以同化物的运输在弱光条件下可能以质外体运输为主，而在正常光照强度下，共质体运输可能是主要的运输方式。

The mature stage started when the vacuole membrane was ruptured.Whereafter,the protoplasm of SE autolyzed selectively,and the mature SE had being formed.

成熟期是筛管原生质组分发生选择性自溶，形成成熟筛管的阶段，以液胞膜的裂解作为分化开始的标志。

According to the changes of plasm components and cell structure,the development process of SE in secondary phloem could be divided into three stages,ie immature,mature and degenerated stages.

根据筛管细胞结构和原生质组分的系列变化，可将筛管发育过程划分为未成熟期、成熟期和衰退期。

By theoretical analysis and experiment, the productivity of well completion with expansion screen pipe is studied and compared with conventional mechanical sand control completion.

结合理论分析和实验研究了膨胀筛管完井后产能，并对比了一般机械防砂方式，以独立筛管完井和砾石充填完井为例进行了对比计算。

And the laboratory test proves that the technique of high temperature artificial borehole wall can satisfy the needs of sand control in the field.

其中，在小直径筛管防砂技术中，防砂筛管和封隔器的设计是主要的；而通过室内试验证明，高温人工井壁完全能够满足现场防砂要求。

Thirdly, on the basis of the productivity model of ideal wells , we comprehensively consider the additional pressure caused by different completion methods and establish four structures of multilateral horizontal wells in 8 different completion methods of the actual open hole completion, slotted liner completion,slotted liner completion with external casing packer, open hole downhole gravel pack completion, openhole prepacked gravel liner completion, casing perforated completion, inside casing gravel pack completion, inside casing prepacked gravel liner completion.

在理想井产能模型的基础上，综合考虑不同完井方式所造成的附加压力损失，建立了这四种分支水平井结构在实际裸眼完井、割缝衬管完井、带ECP的割缝衬管完井、裸眼井下砾石充填完井、裸眼预充填砾石筛管完井、射孔完井、套管内井下砾石充填完井、套管内预充填砾石筛管完井等8种不同完井方式下的产能模型。

In the light of geological characteristics of Dongfang 1-1 Gas Field, mass indoor experiments are conducted and studied. Sand grain level are analyzed, the sand control parameters and screen pipe and blind pipe combination proportion is optimized. On this basis, the most suitable horizontal screen pipe sand control method for this gas field is found. Through the medium of DONGFANG 1—1 gas field field conduct proven, the sand control technology are completely run up to DONGFANG 1-1 gas field completion require.

针对东方1—1气田的具体地质特征，通过大量的室内实验研究，对地层砂粒度进行了分析和分选性研究，对防砂参数和筛管与盲管的组合比例进行了优化，从而找出最适合该气田的水平井筛管防砂完井方法，通过东方1—1气田的现场实施证明，该防砂技术完全达到了东方1-1气田完井的要求。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失