粒层

Pt nano particles decorated with nafion ionomers were synthesized and used as electrocatalyst in proton exchange membrane fuel celldue to plentiful proton channels provided by the enwrapping polymers.Then decorated Pt particles were deposited on carbon nanotubes,which enwind each other into interconnect nets and form the framework of the catalyst layer for PEM fuel cell.

介绍了Nafion聚合物作为修饰离子，合成具有原位质子导电能力的纳米Pt颗粒；TEM分析显示Pt颗粒的平均粒径为4nm，颗粒之间界限明显，分散状态良好；将这种离子导体修饰的纳米Pt沉积到纳米碳管表面作为质子交换膜燃料电池催化电极，纳米碳管相互缠绕在催化层形成交联的电子通道。

The results show that, by the way of optimizing preparation condition, the spherical zirconia powders with suitable particle size distribution are prepared using chemical precipitation method. Using heterogeneous chemical precipitation coating technique, the sph, erical nickel coated zirconia powders are prepared and the heterogeneous nucleation can be done on the surface of spherical zirconia powders. The thickness of coated layer, homogeneous degree and crack of surface can be controlled by the way of controlling powder concentration, adding rate of reactants feeding and adding surface active agent.

研究表明，采用化学沉淀法，通过优化制备工艺条件，可以制备粒径分布较均匀的球形氧化锆粉体；利用非均相化学沉淀包裹技术制备的金属镍包裹氧化锆微球粉体，球形氧化锆颗粒表面作为异相成核的场所，通过控制颗粒浓度、加料速度以及添加表面活性剂等工艺条件，可以调控包裹层厚度、表面均匀度以及表面裂纹等。

Using oxygen ethine flame spraying weld technology,taking Ni base alloy powder Ni O2C as material of spraying weld layer,the spraying weld prestrengthening to the sealing chute of No.

采用氧一乙炔火焰喷焊工艺，选择镍基合金粉末 Ni-O2 C作为喷焊层材料，对莱钢烧结厂 1#烧结机密封滑道，进行喷焊预强化，解决了高温烟气冲蚀和磨粒磨损问题。

In Kela-2 gas field located in the northern Kuqa depression in the Tarim Basin, the natural gas reserves are mainly accumulated in the litharenite and feldspathic litharenite of braided river delta facies in the Cretaceous Bashijiqi Formation.

塔里木盆地库车坳陷北部的克拉2气田的天然气主要储集于白垩系巴什基奇克组辫状河三角洲沉积的岩屑砂岩、长石岩屑砂岩中，储层孔隙发育，连通性好，以受溶蚀作用改造扩大的粒间孔隙为主。

The pollen development of fertile barley is similar to the general development rule of Gramineae, but the st...

可育的药壁发育正常同于单子叶型，直到2细胞花粉粒时期绒毡层才全部退化。

People often occur in elderly vascular sclerosis, high blood pressure sustained more easily lead to cerebral arteriosclerosis, vessel wall hyalinization appears fat, thus weakening the strength of the vessel wall, together with the blood of the structure of the wall is relatively weak, the middle vascular myocytes less, the lack of external elastic layer developed arterial adventitia easily occurred in the brain artery wall limitations small expansion, the formation of micro-miliary aneurysm.

人到老年血管常会发生硬化，持续的高血压更容易导致脑动脉硬化，血管壁出现脂肪玻璃样变，从而削弱血管壁的强度，加上脑血管壁的结构比较薄弱，血管中层肌细胞少，缺乏外弹力层，动脉外膜不发达，容易造成脑内小动脉壁发生局限性扩张，形成粟粒性微动脉瘤。

The locomotory apparatus that emerges during the spermiogenesis consists of the multilayered structure, basal bodies, flagella and accessory structures.

精子发生过程中形成的运动器的各部分结构包括鞭毛、基体、多层结构及附属结构；基体是细胞中新形成的结构，在不同类群的蕨类植物中分别由双中心粒、分支生毛体和生毛体产生。

Small amount of metaphosphoric acid is produced and remained on fiber.

磷酸致孔的机理主要是磷酸珠粒的阻碍造成类石墨微晶片层发展不完善，堆叠时发生扭曲或形成缺陷，磷酸与纤维素分子的酯化对微孔的生成有影响。

By field sampling, some original soil microbiotic crusts were gathered and their physico-chemical properties were analyzed. The results revealed that the longer the sand dunes have been fixed, the thicker and the more biocrusts are formed. The thickness of the crusts under four different types of plant community ranges within 0.3 ~ 1.5cm.

物理结皮通常是土壤粘粒在雨水、径流等外力的物理作用下，使土壤表层孔隙堵塞而成型的一层土表硬壳；生物结皮是有不同种类的低等生物组分与其下很薄的土壤共同形成的一个复合的生物土壤层[2]。

A muskeg berry is a bit of seed enclosed in a bit of water.

这种浆果只是一小粒外面包着一层浆水的籽儿。

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