查询词典 undercooling

It was indicated that the effect of crystal orientation on interfacial stability is because of the different atomic bond number formed in the solidification of liquid atoms on different crystal planes, which affects the decrease of system energy, and affects the effective jump frequency of liquid atom migration to solid interface and solid atom migration to liquid, and finally affects the solute distribution in the front of liquid-solid interface and composition undercooling.

研究表明，晶体取向对凝固界面稳定性的影响是由于液相原子在不同晶面结晶面上沉积时形成的原子键不同，影响了系统自由能的降低，影响了液相原子迁移至固相界面上的有效跳动频率和固相原子迁移至液相中的有效跳动频率，影响了液固相界面前沿的溶质分布和成分过冷所致。

The relationships of cleanness , undercooling and grain size of low carbon steel have been investigated by using of vacuum glass encasement levitation melting.

利用玻璃包熔真空悬浮熔炼等手段研究低碳钢的纯净度、过冷度与晶粒度之间的关系研究表明：随着包熔次数增加，钢中夹杂物含量减少，纯净度提高。

According to the experimental observations from Fujiwara et al, when the undercooling is low enough, the (111) silicon will be the dominant orientation in the polycrystalline silicon. As the undercooling becomes much higher, the (100) will be the dominant orientation.

根据Fujiwara等人所进行的矽晶粒竞争生长实验，当过冷度很小时，生长出的多晶矽中，(111)晶向的矽晶占了大多数；然而在过冷度较大时，(100)晶向的矽晶则为多数。

One undercooling criterion of equi-nucleation is derived from analysis of Gaussian distribution model of heterogeneous nucleation.

通过对高斯异质形核公式的研究，给出了等轴晶开始形核的过冷度判据，更为准确的描述柱状晶向等轴晶的转变过程。

A inoculant containing rare earth element could The experimental results show that the addition of reduce the undercooling, the chilling tendency, hardness and blowhole formation tendency of the cast iron, and increase its tensile strength.

结果表明：含稀土元素的孕育剂可以降低铸铁的过冷度及形成白口的倾向性，能降低硬度及形成气孔的倾向性，可以提高铸铁的抗拉强度。

It has found that there is a linear relationship between crystal growth velocity and the undercooling.

晶体生长速度和过冷度成线性关系。

The calculating results which predict that the tip undercooling decreases continuously with an increase of the primary spacing and no minimum undercooling exists have lent an obvious evidence to the above theoretical analyses. The tip undercooling changes sharply for the low primary spacings but slowly for the large spacings.

本文提出的数值模型表明，Peclet数较小时，可以将强制性枝晶生长处理成自适应边界条件进行数值计算；计算结果充分证实了上述的理论分析，并指出顶部过冷随一次间距的增大而连续减小，不存在最小过冷值；一次间距较小时顶部过冷变化显著，较大时变化缓慢。

With increasing undercooling, the solidification microstructures of the alloys have changed, for example, grain refinement, transformation from regular rod eutectic structure to spherical anomalous eutectic grain structure with particulate morphology; while at higher undercooling, fine regular eutectic structure was observed.

随着过冷度的增加，其凝固组织发生了一系列的变化：晶粒逐渐细化，凝固组织从规则棒状共晶向异常粒状共晶组织转化，最后得到显微结构细小的胞状共晶团组织。

The primary phase formation and phase evolution during growth processes related to the undercooling D T and solidification velocity V were systematically investigated by the means of high undercooling and laser resolidification techniques.

由于材料的最终组织取决于凝固初期的相选择和凝固后期的组织演化过程，因此对非平衡条件下包晶合金中的相形成规律研究具有相当重要的理论意义和应用前景。

The results indicate that MgB2 phase has smaller critical nucleation energy, higher nucleation rate and shorter incubation time comparing with MgB4 phase as the undercooling degree excesses to a critical value at a low undercooling range. Hence, the MgB2 phase nucleates primarily from the melt and grows up.

结果表明：在小过冷度范围内，当过冷度大于某一临界过冷度时，MgB2相比MgB4相具有更低的形核功、更大的形核率和更短的形核孕育时间，因而MgB2相从与MgB4相的竞争形核中胜出，优先从合金熔体中形核并生长。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。