气孔

Fagus pashannica ; seedlings ; stomatal density

巴山水青冈；幼苗；气孔密度

The amount of yeast has great influence on the porosities and flexural strength of the SiC porousceramics.

酵母粉的添加量也直接影响碳化硅多孔陶瓷的气孔率和抗折强度。

Mm. 7.5.3 Requirements for quality of weld joint's surface: a No crack, not fusional, bubble, slag, splash; b Surface of seam of pipeline with design temperature lower than -29℃, stainless steel pipeline and alloy steel pipeline with trend of harden quenching shall be free from undercut.

The surface shall be smooth 7.5.3 焊接接头表面的质量应符合下列要求： 28 SH 3501-2002 a 不得有裂纹，未熔合，气孔，夹渣，飞溅存在； b设计温度低于-29℃的管道，不锈钢和淬硬倾向较大的合金钢管道焊缝表面，不得有咬边现象；其他材质管道焊缝咬边深度不应大于 0.5mm，连续咬边长度不应大于 100mm，且焊缝两侧咬边总长不大于该焊缝全长的 10%； c 焊缝表面不得低于管道表面，焊缝余高Δh 应符合下列要求： 1 100%射线检测焊接接头，其Δh≤1+0.2b1，且不大于 2mm； 2 其余的焊接接头，Δh≤1+0.2b1，且不大于 3mm。

Low density silicon nitride with about 55% porosity and globed macropores was prepared by reaction-bonded raw silicon powder and adding 30% in mass pore-forming agent of benzoic acid ball-like particles.

以硅粉为原料，添加质量分数为30%的成孔剂球形颗粒，反应烧结制备了气孔率为55%，具有球形宏观孔的低密度多孔氮化硅陶瓷。

According the research, by inducing TiC into conventional carbon/ graphite materials, their flexural strength increased 13.4%, compressive strength increased 38.1%, void ratio decreased 16.9% in respective. The reason of the performance improvement is as follows: TiC decomposed during the process and hence Ti accelerate the graphitize process, which can increase the mechanical performance of the carbon/ceramic composite materials.

从研究结果可以看出，TiC掺杂可使碳陶瓷复合材料的抗折强度提高13.4%，抗压强度提高38.1%，气孔率降低16.9%；其机理在於TiC掺杂在碳陶瓷复合材料制备过程中能促进碳陶瓷石墨化，使晶体更加完整、细化，有利於力学性能的提高。

The "midday depression" of Guzmania could be attributed to the high temperature and radiation, which caused the partly closure of stomato and inhibition of photosynthesis.

高温、强光引起的气孔部分关闭及光抑制是导致观赏凤梨光合&午休&现象的主要原因。

Scanning electron microscope image of Heliotropium lower leaf surface, showing trichomes and a few stomata.

扫描电子显微镜图像Heliotropium降低叶表面，显示皮毛和一些气孔。

Then the following properties of the bovine calcined bone slices were tested: porosity rate, hydrophilism, density, bending strength, mineral composition and heat analysis.

将40mm×5mm×2.5mm骨条按不同温度、时间进行烩煅烧处理后，进行气孔率、吸水率、体积密度、抗折强度的测定，以及差热分析、材料矿物组成分析。

ZnO, MgO and SiO_2 powders were covered on top of the alloy as dopants, the effects and principles of the dopants were discussed. Based these, SiC particles were made into preforms with different distribution of air holes by changing the granularity of SiC particles and the content of graphite additive, and the oxidation growth of aluminum alloy melt into the air holes within the preform was controlled to prepare SiC/Al_2O_3/Al composite with inerratic shape. And the SiC particles effect principle to the oxidation of SiC/Al2O3/Al composite was studied.

以ZnO，MgO和SiO_2为引发剂，覆盖在合金表面，讨论了引发剂的添加效果和作用机理；在此基础上将α-SiC颗粒制作成为预制体，通过改变SiC的粒度和石墨造孔剂的含量，调整预制体内部的气孔分布，控制铝合金熔体在预制体孔隙内的氧化生长，制备出形状规则的SiC/Al2O3/Al复合材料，同时研究了SiC颗粒的存在对SiC/Al_2O_3/Al复合材料生长机理的影响。

The New Rice Variety Liaoxing 1,with high eurytopicity has higher photosynthesis rate,higher stoma conductance,higher SPAD,higher ingather quotiety than other largely planted varieties in Liaoning Province,when planted in the rice area from 39°N to 43°N.Different from other varieties,when planted in four spots in different latitudes,the yield components of Liaoxing 1 change little and so it keeps higher yield level.

水稻新品种辽星1号具有很强的广适性，从北纬39°到北纬43°布点试验，用L6400光效测定仪测定辽星1号及其对照品种的光合速率、气孔导度、叶绿素含量、经济系数等指标，在4个不同纬度，辽星1号的各项指标均显著地高于辽宁其它主栽品种；产量结构没有发生很大变化，产量始终表现出较高水平。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！