热扩散

During the evolution of these granitoids which resulted from rejuvenation and anatexis of the old basement (1200-2000Ma), the main ways for REE differentiations were:(1) partial melting;(2) fractional crystalization;(3) thermogravitational diffusion;(4) differentiations of metamorphism and migmatism, and (5) hydrothermalism.

在花岗岩的形成和演化过程中，有五种最主要的方式造成REE的分馏作用：(1)部分熔融作用；(2)分离结晶作用；(3)热重力扩散作用；(4)变质-混合岩化作用和(5)热液流体作用。

The soret effect and Dufour effect on the convective diffusion of VOCs in indoor surroundings was specially investigated.

并采用数值方法研究了室内环境中同时存在温度梯度、湿度梯度和VOCs浓度梯度时的自然对流传热传质现象，着重分析了考虑交叉扩散效应时热瑞利数和浮力比数等对室内VOCs对流扩散的影响。

Finally, the existence, uniqueness and convergence of solution to the original reaction diffussion system are obtained by the properties of heat conduction equation.

借助于热传导方程与反应扩散方程组的同解性，最终得到了反应扩散方程组解的存在性、惟一性以及收敛性。

The comparison between experimetal and calculated results indicated that the simulation model and equilibrium phase diagram calculation can exactly describe the elements distribution law and predict microstructure variation near interface.

计算结果表明：该模拟方法能够准确描述热等静压扩散焊接过程中的元素浓度分布规律，同时能够预测扩散反应层内的微观组织变化。

Three hypotheses is put forward, based on microexamination about sample evaporation during determaination of isotope abundance by thermal ionization:1. Only atoms uncovered by outer layer atoms can be vapoured; 2. Atoms covered by outer layer atoms can diffuse but cannot vapoure; 3. The probability of diffusion of isotope atoms is in direct proportion to its probability of evaporation.

根据对热表面电离源同位素丰度测量过程中样品蒸发的微观研究，提出如下三条假设：(1 )未被外层原子覆盖的原子才能蒸发；(2 )被外层原子覆盖的原子只能扩散不能蒸发；(3 )同位素原子的扩散几率与蒸发几率成正比。

Microstructure observation, micro-hardness testing, scanning electron microscope observation, energy dispersive spectroscope and X-ray diffraction analysis were employed to investigate the structure and performance of the joints.After SSNCed for 5min by means of HESP, surface nanostructured layer about 70μm and 50μm thickness were obtained on the stainless steel and titanium alloy ends respectively.

文中对高能喷丸处理后的不锈钢和钛合金的纳米组织进行了表征；试验研究了不锈钢和钛合金表面层纳米组织的热稳定性；采用恒温恒压、脉冲加压对表面自纳米化0Cr18Ni9Ti不锈钢与TA17近α钛合金进行扩散连接；借助拉伸实验机、金相观察、显微硬度测试、扫描电镜观察、能谱分析、X-射线衍射等分析手段研究了表面自纳米化钛合金与不锈钢扩散连接接头的组织结构和性能。

This paper has studied the interface reomhbination characteristics of HIPdiffusion bonking of cemented carbide to metals including commercial pure iron,A3 car-bon steel,No .45 carbon steel and T10 carbon tool steel.

研究了硬质合金与工业纯铁、A3钢、45钢和T10碳素工具钢等金属热等静压扩散的界面复合特征，阐述了有害界面脆性相η－Fe＿3W＿3C的成因和控制方法，考察了各扩散连接接头的接合强度。

In this paper, preliminary FDS fire chamber to simulate the flue gas generated through the corridor adjacent to the room near the migration laws, an analysis of indoor air flow field and the movement of smoke layer, and through the simulation of fire scenes, in a simple form of visual dynamic display of the entire process of fire, in the simulation process to obtain more accurate fire-related parameters such as temperature distribution, gas flow and heat radiation, and analysis of simulation results through the fire chamber of the flue gas migration characteristics, results showed that the chamber in the absence of fire smoke control measures, the process of the spread of smoke filled the first chamber is at the top, with the passage of time, the proliferation of slowly downward until the entire chamber is full, and then through the corridor smoke quickly spread to the nearby chamber.

本文运用FDS初步模拟了腔室火灾产生的烟气通过毗邻的走廊向附近房间迁移的规律，分析了室内空气流场和烟气层运动状况，并通过对火灾场景的模拟，以简单直观的形式动态显示出火灾发生的全过程，在模拟过程中获得较准确的火灾相关参数，如温度场分布，烟气流动及热辐射等，并通过模拟结果分析腔室火灾的烟气迁移特性，结果表明着火腔室在无防排烟措施的情况下，烟气扩散的过程是首先充满腔室顶部，随着时间的推移，慢慢向下扩散，直至将整个腔室充满，然后烟气通过走廊快速向附近腔室蔓延。

According to the experimental results, both the conducting area and material of current collector slices have great influence on the performance of micro PEMFC, especially the former one. The increment of cell's performance is finite by increasing the gas reheats temperature. The performance is better for open ratio 75% compared with 50% and 67%. The concentration polarization is improved by increasing the air flow rate at high current density and if the GDL diffusive capability in the latter cell could be promoted, the differences between these two cells' performances would be reduced.

由实验结果可知，集电片的导电面积与材料对於电池性能有显著的影响，尤其是前者；对於增加反应气体的再热温度，微型燃料电池增加的性能有限；双极板开孔率75%相较於开孔率为50%与67%有最佳的性能曲线；增加阴极气体空气的流量，可以改善高电流情况下的浓度极化现象，所以若我们能增加气体扩散层的扩散能力，则可以减少两者的性能差距。

In this paper, in terms of diffusion equation of neutral gas in thermosphere and main ion-chemistry reactions in ionospheric F region, the diffusion processes of H2, H2O and CO2 and ionospheric response to released gases are investigated.

根据中性气体在热层背景中的扩散方程，考虑电离层F区主要的离子化学反应，研究了H2，H2O和CO2气体在电离层高度上的扩散过程和电离层对所释放气体的响应，计算了气辉的体发射系数和发射强度。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。