查询词典 alkaline earth

Promotion effects of alkaline earth metals and rare earth metals on catalytic activity and coking resistance of the catalyst are also described.

阐述了碱土金属和稀土金属助剂在提高催化剂的重整活性和抗积炭能力方面的作用。

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。

The anion-exchange ion chromatography is suitable for the separation and analysis of alkaline earth metal ions, transition metal ions and rare earth metal ions.

综述了离子色谱法分析金属离子的研究进展，对目前应用于分析金属离子的阳离子交换IC、阴离子交换IC和螯合离子色谱进行了评述。

The components comprise the following materials: 40 to 50 percent of GeO2, 20 to 25 percent of SiO2, 0 to 10 percent of Al2O3, 5 to 16 percent of MO or MF2, 0 to 10 percent of R2O3, and 1 to 10 percent of ZrO2; the M is one or more of the alkaline-earth metal ions, the R is one or more of the trivalent rare earth ions.

一种0.3～5um波段红外透过耐高温玻璃陶瓷材料及制备方法，成分包括GeO 2 40-50％，SiO 2 20-25％，Al 2 O 3 0-10％，MO或MF 2 5-16％，R 2 O 3 0-10％，ZrO 2 1-10％；M为碱土金属离子中的一种或几种，R为三价的稀土金属离子中的一种或几种。

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。

Rare earth luminescence materials of alkaline earth stannates have also been prepared via thermal decomposition of hydroxo stannate precursors.

利用某些新型带羟基的碱土锡酸盐作为前驱体，固相反应合成掺稀土的锡酸盐发光材料。

The results showed that it is feasible to synthesis the rare earth alkoxide by taking the alkaline earth alkoxides as the providers of alkoxy.

结果表明，以碱土金属醇盐为烷氧基提供者制备稀土金属醇盐是可行的。

Process for the preparation of phosphatidylserine of formula wherein R and R independently represent a saturated, mono-unsaturated or polyunsaturated acyl C10-C30, X=OH or OM where M=alkaline or alkaline earth metal, ammonium, alkylammonium including the transphosphatidylation reaction between phosphatidylcholine of the general formula wherein R and R and X have the above specified meanings, R=CH2-CH2- NH2 o CH2-CH2-N(CH3)3 and Serine in D, L or racemic form catalysed by the phospholipase D enzyme, characterised in that said reaction is carried out in a hydroalcoholic medium containing an aliphatic alcohol and in the presence of bivalent metal oxide.

本发明涉及制备式CH 2 OR 1 CHOR 2 CH 2 O-P-OCH 2 -CH(NH 2 )-COOHX的磷脂酰丝氨酸的方法，其中R 1 和R 2 独立地表示饱和的、单不饱和的和/或多不饱和的酰基C 10 -C 30 ，X＝OH或OM，其中M＝碱或碱土金属、铵、烷基铵，该方法包括通式CH 2 OR 1 CHOR 2 CH 2 O-P-OR 3 X的磷脂酰胆碱其中R 1 和R 2 以及X具有上述特别的含义，R 3 ＝CH 2 -CH 2 -NH 2 或CH 2 -CH 2 -N (CH 3 3 与D、L或外消旋形式的丝氨酸之间的转磷脂酰化反应，该反应是通过磷脂酶D酶催化的，其特征在于所述的反应是在包含脂族醇的含水醇介质中并且在二价金属氧化物的存在下进行的。

Catalysts used for abating the pollution of automobile exhaust emissions were prepared by nonprecious metal oxides, such as the oxides of Ⅰ B,Ⅴ B,Ⅵ B,Ⅶ B,Ⅷ B group, alkaline earth group and rare earth elements.

在实验室用模拟汽车排气，评价催化剂的氧化、还原效率，获得了具有较低起燃温度的催化剂(对于CO低于150℃HC为200℃)，机械强度良好，而且可承受高温冲击(耐温可达900～1000℃)。

The interactions of alkali and alkaline-earth ions and rare—earth metal ions with saccharides, resulting in the formation of saccharide adducts, have been investigated in great detail.

本文主要从糖的构型、构象、金属离子半径的大小和电荷的影响等方面入手分别研究了固体和水溶液中糖与金属离子的配位现象。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。