镁的

The influence of Ce, Nd and Sr on the as-cast microstructure of AZ91 alloy was investigated by optical microscope、scanning electron microscope、electron probe microscope analyzer、differential thermal analyzer and X-ray diffract analyzer, et al.

本文以目前使用最广泛的AZ91镁合金为研究对象，分别添加不同含量的稀土元素Ce、Nd和碱土元素Sr，研究了三种元素对AZ91镁合金微观组织和腐蚀性能的影响。

The study of Magnesium alloys have taken more and more attention, especially the strengthen and elongate of Mg alloys.

镁合金材料的研究是当前人们关注的热点，特别是镁合金的强韧化问题。

In this text, we designed the testing program of fibrous brucite concrete, investigated its mechanics performance.

在本文的试验部分，我们设计了水镁石纤维混凝土的试验方案，考察了水镁石纤维混凝土的力学性能。

The atmospheric galvanic effects in Beijing compared with other cities indicate that atmospheric environment is most important factor.

通过与其它地区室外暴晒的镁合金电偶腐蚀效应的对比，表明环境因素影响着镁合金的电偶腐蚀效应。

The results show t hat yttrium exists as the form of compound (Al2Y) in AZ31 magnesium alloy, and dystectic Al2Y as the heteromorphic nucleation emerges firstly in the cou rse of alloy precipitation, which refines the alloy's microstructure and obviou sly improves the mechanical properties at room and high temperature. The average grain size of AZ31 magnesium alloy containing Y is reduced by 35.82%. Tensile s trength, yield strength and elongation percentage reach 212 MPa, 147 MPa, and 7. 5% at room temperature respectively, and 117 MPa, 98 MPa, and 10.2% at 200 ℃ re spectively.

结果表明，Y在AZ31 镁合金中主要以块状Al2Y化合物形式存在；高熔点的Al2Y在合金凝固过程中首先析出，成为凝固的异质形核剂，从而细化了合金组织，改善了室温和高温力学性能；由于Y的强化，含Y AZ31镁合金平均晶粒尺寸降低幅度约为35.82 %；室温抗拉强度、屈服强度和延伸率分别为 212 MPa， 147 MPa和7.5%，200 ℃时分别为117 MPa， 98 MPa和10.2%。

The variation of ignition temperature caused by the addition of RE and Ca is discussed, the micro structure of the alloys is observed, and the ignition point is tested.

研究了加入混合轻稀土和Ca对AZ91D镁合金起燃温度的影响，观察了镁合金的金相组织，测试了各合金试样的起燃点，并进行了总结与比较。

Tin interlay increased the wetability of magnesium and aluminum under the condition of arc, reduced the mount of intermetallic compounds produced, but not prevented the formation of intermetallic compounds completely.

锡镀层增加了镁合金和铝合金之间的润湿性，减少了镁铝金属间化合物的数量，但是并没有完全阻止金属间化合物的生成。

Two solutions were proposed in this article. For the first, interlay was added to avoid the contact of magnesium and aluminum and the produce of the intermetallic compounds; for the second, laser- TIG hybrid welding method was adopted to reduce the contact period of magnesium and aluminum and the mount of intermetallic compounds produced.

本文提出了两种解决途径：第一，中间加入镀层避免镁和铝的接触，避免金属间化合物的生成；第二，采用激光—TIG复合热源焊接减少镁和铝接触时间，减少金属间化合物的生产量。

Influence of the composition of fused magnesia zirconia materials on its microstructure and properties were investigated.

研究了轻烧氧化镁和锆英砂的配料组成对电熔镁锆合成料的显微结构和性能的影响。

First, a series of numerical analysis experiments are designed to investigate the effect of process variables on the damage factor, which constructs the learning samples for training the artificial neural network.

将基于数值模拟、人工神经网络和遗传算法的优化方法应用到镁合金的挤压工艺参数优化中，实现了镁合金挤压工艺设计过程中的参数优化问题。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。