粉末

The products were characterized by X-ray diffraction、Fourier transform Infrared、thermal gravity、differential thermal analysis and transmission electron microscopy respectively .

产物通过 X-射线粉末衍射、透射电子显微镜、热重分析、差热分析、傅立叶红外光谱等手段进行了表征。

In this paper, nanopowders of rare earth oxides and tungsten were prepared and 0-3 type nano-composit rare earth tungsten thermionic emission materials were fabricated with novel technics. The raw material selection, preparation technic parameter, structure, physical and chemical characteristic, the rare earth distribution and the emission behavior were studied. The influence between the active layer and the thermionic emission performance, rare earth elements diffusion and distribution along depth were investigated in detail. The surplus RE formation and the electron transfer were discussed in theoretically. The thermionic emission current density of the single surplus RE on the active layer was educed. We adopted "liquid-liquid mixing, freeze-drying and two stage-reduction" working step firstly to produce the RE-W nanopowders including La-W powder, Ce-W powder and Y-W powder.

本文采用细化显微组织的新工艺，制备了纳米稀土钨粉末和0-3型纳米复合稀土钨热电子发射材料，探讨研究其原料选择、制备工艺及参数、结构特征、物理和化学特性、稀土分布均匀性、以及热电子发射特性；系统研究了稀土元素的高温扩散情况、高温状态下活性层中稀土的纵向深度分布、以及表面活性物质和活性层厚度对热发射性能的作用；从理论上分析阐释了超额稀土的形成及其电子的传递过程；并从理论上推导了活性层中单个超额稀土的热电子发射电流密度。

After active carbon powder and alloy steel powder are added to the thermit, the self-propagating high-temperature synthesis reaction starts.

本文研究了合金化自蔓延陶瓷内衬复合钢管制造技术，即在铝热剂中加入活性碳粉或合金钢粉末，进行自蔓延高温合成反应，分析了碳和合金元素对复合钢管过渡层的影响。

By adding ZrO2(4Y) to the thermit,the influences of centrifugal force and eutectic composition on the microstructure,mechanical properties, strengthening and toughening of ceramics lining are researched.

基于燃烧合成理论，在铝热剂中添加ZrO2(4Y)粉末，采用离心技术制备出了高强度、高韧性的Al2O3/YSZ共晶系陶瓷内衬复合管，并研究了离心力、共晶成分对陶瓷内衬显微结构、力学性能及强韧化本质的影响。

Both bulk and powder compact samples were thermally treated at 300℃ which is far below the glass transition temperature (419℃) as determined from the DTA thermogram.

块材和粉末压实样品均在300℃进行了热处理，该温度远低于玻璃转变温度419℃。

Professional company to create "Hongyi" brand thermoset powder coatings and iron cans torch.

公司专业制造"宏益"牌热固性粉末涂料和铁制品火炬罐。

Improvement in the photocatalytic activity of TiO〓 is of theoretical and practical importance in its development and application.

本论文采用溶胶—凝胶方法制备了Ag掺杂的TiO〓粉末和薄膜，研究了Ag对于TiO〓结构和光催化性能的影响，研究发现

A toilet powder made of talc and usually scented absorbs excess moisture .

用的滑石制成的带有香味的洗刷粉末；吸收过多的湿。

A toilet powder made of purified talc and usually scented; absorbs excess moisture.

用净化的滑石制成的带有香味的洗刷粉末；吸收过多的湿气。

A toilet powder made of purified talc and usually scented absorbs excess moisture .

用净化的滑石制成的带有香味的洗刷粉末；吸收过多的。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷