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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。

The centrifugal force and content of CaF〓 in thermit can affect the surface roughness of stainless steel layer. It is important to heat the thermit before ignition to decrease the Al content in stainless steel layer.

经过反复的实验发现，制备低铝量的18—8不锈钢内衬复合钢管的修正配方为：〓采用适当的预热温度和离心力下，按上述配方配制的铝热剂经适当调整后可以制备出成分满足要求、内表面光滑、结合强度高的复合钢管。

The oxygen exchange rate was obtained according to the variation of amount of oxygen in the mixed layer column from surface to thermocline layer of sea water.

而大气中昨一些可能影响气候的痕量气体，以及由海洋产生，并向大气释放的气体，在海空界面之间的交换通量及交换速度，近年来更引起人们的注意。

Southern District for the low-density 4 layer and 6 layer Floor, 4 Floor layers, one, two for叠拼thermocline, three, four for one design of a staircase.

南区为低密度4层和6层楼， 4层楼，一，二为叠拼跃层，三，四为一的设计楼梯。

The formation of egg yolk thicken layer by layer.

蛋黄的形成是自蛋黄外层逐层增厚的过程。

The relative water content in tilth layer could still be kept over 60% in the continuous 11.2~47.1d without precipitation after a precipitation made the relative water content in tilth layer got over 80%.

使耕层相对含水量达到80%以上的一次降水过后，连续11.2~47.1 d无降水，耕层相对含水量尚可维持在60%以上。

RTL8019AS and its driver program realize the physical layer and data link layer in the reference model of tiny TCP/IP stack.

参考模型中的物理层和数据链路层由网络接口芯片RTL8019AS及其驱动程序完成的。

Based on model TGSC, the multi—layer temporal set covering diagnosis model MTGSC which describes multi—layer transitive relation of causation between disorders and manifestations.

第二章中，通过引入时态一致集合覆盖的概念，提出一个基于时态推理与覆盖技术的时态覆盖集诊断模型TGSC，TGSC利用模糊集描述有关征兆、故障及相互间的时态约束关系，采用基于假设图搜索的诊断问题求解方法。

The numerical calculation shows that the space distibution of the electromagnetic field in each sub-micro-layer changes with the varing transmission depth in the relief grating, the space distribution in each sub-micro-layer is uniformer than that in isotropic grating and the optical parameters of the anisotropic relief grating and the incident beam have a large impact on the space distribution of the electromagnetic field in relief grating and so on.

数值计算表明，光波场光强的空间分布随透射深度的变化而变化，各向异性介质光栅体内光波场的空间分布相对各向同性介质要均匀，光栅材料的性质参数和光束的入射参数对光波场光强的空间分布有较大的影响等。

Thick portions 212TH provided to non-formation regions of the transmissive layer 214 are formed to the colored layer.

在着色层上形成设置在透光层214的非形成区域上的厚层厚部分212TH。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。