碱土

All alkaline earth elements have an oxidation number of +2, making them very reactive. Because of their reactivity, the alkaline metals are not found free in nature.

所有的碱土金属元素的化合价都是+2，这使他们非常活泼，因为他们非常活泼，也不在自然界中直接出现。

It is found that in the series of alkaline earth borates the four points of 〓,〓 and SrB〓O〓 are on the same line, but the points of 〓 and BaLiBO〓 deviate from this line.

在碱土硼酸盐系列晶体中〓，〓和SrB〓O〓四种晶体所对应的点处在同一条直线上，而〓和BaLiBO〓晶体所对应的点并没有处在这条直线上。

Miniaturization of hydroxide of alkaline-earth metal and solubility of salt, flame reaction of alkaline-earth metal ions, separation and identify of alkaline-earth metal ions was investigated.

系统探讨碱土金属氢氧化物及其盐的溶解性、碱土金属元素的焰色反应、碱土金属离子的分离和鉴定等微型化实验，并将其设计成新的微型实验应用于无机化学实验教学，效果良

Electrical porcelain body ; material performance ;α-Al2O3; alkaline-earth metal component

电瓷材料；材料性能；α-Al_2O_3；碱土金属元素化合物

A combosition of high performance porcelain body material was development for manufacturing solid core post insulators of 500 kV/20 kN and above,α-Al2O3 was introduced for enhancing mechanical strength and alkaline-earth metal components were introduced as flux and "alkaline-restrainer".

为了满足生产550kV/20kN以上棒形产品的要求，对高性能电瓷材料配方进行了研究，在配方中添加α-Al2O3，可提高电瓷材料强度；添加碱土金属元素化合物，可起到强熔剂与"压碱效应"的作用。

It is concluded that, first, geochemical data of the surface soils can clearly distinguish two kind of soils, that is, juvenile soils, for example, purple soils, which inherits most geochemical characteristics of the parent rocks or materials, and anthropic soils, the geochemical characteristics of which have been greatly changed as the results of intensive impact from variety of agricultural uses. Second, different soils have typical indicator elements association respectively due to different parent rocks or materials and utilization, such as purple soils, yellow soils (low alkali and alkaline-earth metal contents and pH value), paddy soils (high organic element and heavy metal elements contents) and fluvo-aquic soils (high rock-forming accessory mineral elements contents) and so on. Consequently, it can be suggested that elements association is an important indicator for two key factors (parent materials and anthropic activities) of soil classification. Third, some differences exist between soil genesic classification and result of cluster analysis, because geochemical characteristics of surface soils can not completely represent the foundation applying to soil genesic classification, that is, condition and process of soil-forming, and soil property.

结果表明：浅层土壤的地球化学数据能较好地用来区分两类土壤，即紫色土一类的幼年土壤（在很大程度上继承了母岩、母质的地球化学特征）和受强烈人为活动水耕、早耕熟化的土壤（外来物质的不断加人显著地改变了浅层土壤原有的地球化学性质）；(2)各类土壤因母岩母质和利用方式不同，各具明显的标志性元素组合特征，如紫色土、黄壤（低碱和碱土金属元素和pH值）、水稻土（高有机元素、肥料元素和重金属元素）和潮土等，因此，这些元素组合是土壤分类两个要素的重要参照系；(3)浅层土壤的地球化学特征不可能完整地体现成土条件、成土过程和土壤属性这三个发生分类依据，因此，聚类分析结果与发生类型之间存在一定的差异。

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。

This could be attributed to the following reasons: fined grain is benefit for the improvement of corrosion property, in which the homogeneous distribution of Al element was also good to improve corrosion performance.

此外，稀土改善耐腐蚀性能的原因可能是减少了有效阴极相Mg_17A1_12的数量和新相具有耐蚀性以及提高了合金的腐蚀电位，而碱土元素则降低了合金的腐蚀电位。

A new system of microscale inorganic chemical experiment s and its teaching effect

系统探讨碱土金属氢氧化物及其盐的溶解性、碱土金属元素的焰色反应、碱土金属离子的分离和鉴定等微型化实验，并将其设计成新的微型实验应用于无机化学实验教学，效果良

Through investigation on the Eh values of cinnamon soil,sierozem,brown desert soil in situ with new electrochemical methods and summarization of the same results of laterite,red soil and yellow brown soil,a horizontal zonal variation of oxidation-reduction characteristics in semi-humid,semiarid and arid areas from south China to north China is revealed.

用新的电化学方法原位考察了褐土、灰钙土、棕漠土、黑土、风沙土、灌淤土、盐土、碱土、亚高山草甸土、灰褐土、水稻土和旱地土壤的氧化还原状况。综合已有原位测定结果，地带性土壤的电位由南向北的空间分异与其水平地带谱相应；亚高山草甸土和灰褐土的氧化还原状况随山体高度和植物群落而呈垂直分异趋势。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。