钨酸

In this paper, 2,2-dimethylolbutyraldehyde was synthesized through the acetal reaction of formaldehyde and butyraldehyde, using silicotungstic acid as catalyst.

通过实验研究了硅钨酸对此羟醛缩合反应的催化效果，研究探讨了硅钨酸对此缩醛反应的催化反应活性，以及催化剂的的用量，反应物配比，反应时间等因素对反应产品收率的影响，确定了最佳催化条件。

This indicates that the physical properties of PWO crystal are sensitive to the lattice structures.

这说明钨酸铅晶体是一种结构敏感的晶体；计算结果为研究钨酸铅晶体的光学性质与晶体结构之间的关系提供理论基础。

The catalysts of supported 〓and 〓 were firstly used inthe etherification of FCC light gasoline.

将负载型磷钨酸和磷钨酸盐催化剂应用于催化裂化轻汽油的醚化反应。

An oxyacid of tungsten formed by neutralizing alkaline tungstate solutions.

钨的含氧酸，通过中和碱性钨酸盐溶液形成。

The invention is characterized in that it dops ytterbium and zinc in lead tungstate crystal, which greatly improves its optical properties on the basis of retaining original good properties of lead tungstate crystal.

本发明在钨酸铅晶体中掺杂元素镱和锌，在保留钨酸铅晶体原有优良性能的基础上，大幅度改善其光学性能。

On the basis of proving the influence of temperature,concentration of solution and stiring intension to the granularity of ammonium paratungstate,micron-level APT.

在探明温度、溶液浓度，搅拌强度对仲钨酸铵粒度影响的基础上，研究了表面活性剂制备微米级仲钨酸铵的工艺。

Its main products and capacity are: Ammonium Paratungstate annual output 6000 tons; Tungsten Oxide annual output 5000 tons; Tungsten Powder annual output 2000 tons; Tungsten Carbide Powder annual output 2000 tons.

主要产品及能力：仲钨酸铵6000吨/年；氧化钨5000吨/年；金属钨粉2000吨/年；碳化钨粉2000吨/年。

Monododecylphosphate was prepared by esterification of lauryl alcohol with phosphoric acid(mass fraction 85%) on cesium phosphotungstate catalyst.

以磷钨酸铯盐为催化剂，由月桂醇和85%的磷酸直接酯化合成单十二烷基磷酸酯，考察了带水剂种类、反应时间、磷钨酸铯盐催化剂中的铯取代数、催化剂用量和月桂醇与磷酸摩尔比等条件对磷酸转化率及单十二烷基磷酸酯选择性的影响。

In the absence of organic solvent and phase-transfer catalyst, the catalytic oxidation of cyclohexene to adipic acid with aqueous 30% hydrogen peroxide by weight can be efficiently catalyzed by tungstenic acid/inorganic acidic ligand.

以钨酸／无机酸性配体为催化体系，在无有机溶剂和相转移剂的情况下，催化过氧化氢(质量分数30％)氧化环己烯合成己二酸。结果表明，以钨酸／磷酸催化氧化环己烯的催化效果最优。

A series of PVC membrane electrodes with nicotine containing different plasticizeres such as octyl phthalate, nonyl phthalate and di octyl dicaproate, and electric active substances such as association of nicotine-tetraphenyl borane, nicotine-silicotungstic acid, nicotine-phospho-wolframic acid and nicotine-Reineckate ammonium were prepared.

以尼古丁为研究对象，研制了一系列含有不同增塑剂(苯二甲酸二辛酯、苯二甲酸二壬酯和癸二酸二辛酯)和电活性物质(尼古丁四苯硼缔合物、尼古丁硅钨酸缔合物、尼古丁磷钨酸缔合物和尼古丁雷氏盐缔合物)的PVC膜电极。

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。