钨酸

The paper summarizes the latest development of acid process for treatment of scheelite concentrate .

综述酸法工艺处理白钨精矿近年来的最新进展，将其与碱法工艺处理白钨精矿进行了分析比较，指出酸法工艺处理白钨精矿仍具有极强的生命力，并提出了最新的酸法工艺流程。

The phosphotungstic acid and the silicotungstic acid are prepared firstly, and the Keggin structure of them is also confirmed by IR spectrum. Then the HPWA/SiO2 and HSiWA/SiO2 are prepared by impregnation, and IR spectrum and UV spectrum are used to characterize the Keggin structure of them.

通过经典酸化－乙醚萃取法制备了钨磷酸和钨硅酸，并用红外光谱证明其具有Keggin结构；再用传统浸渍法对制备的钨磷酸和钨硅酸进行SiO2固载化，然后重点对杂多酸在固载化后Keggin结构是否依然保持进行了研究。

The results showed that the phosphotungstic had better catalytic activities than the silicotungstic acid. As for the supported HPAs, the silica gel support HPAs' catalytic activities were higher than the activated carbon support HPAs.

实验结果表明：对于非负载型杂多酸催化剂，磷钨杂多酸的催化活性要高于硅钨杂多酸；对于负载型杂多酸催化剂，硅胶负载杂多酸催化剂的催化活性要高于活性炭负载的杂多酸催化剂。

The epoxidation can be performedwell when the concentration of quaternary ammoniumsaltand sodium tungstate is 0.06 mol/L and 0.03 mol/L, respectively.

结果表明，季铵盐和钨酸钠的浓度分别为0.06，0.03 mol/L时的催化效果最佳；α-和β-蒎烯的转化率随着H2O2与蒎烯的量比增大而增大，当H2O2与α-蒎烯和β-蒎烯的量比分别为2.0和1.8时，其转化率均可达到100%；较高的温度不利于环氧化反应的进行，因此，环氧化反应温度需控制在20℃以下。

The result shows that the neurons and axons are very clear.CONCLUSION: It is a highly sensitive method to trace nerve pathway by using CB-HRP as tracer and sodium tungstate as stabilizer of TMB.

用CB-HRP作为示踪剂，以钨酸钠作为四氨基联苯胺显色剂的稳定剂的方法是一种高效敏感的神经通路追踪方法。

On the other hand, sodium tungstate dehydrate complexed with oxalic acid can act as highly efficient catalysts for the transformation from alcohols to carbonyl compounds under controlled microwave irradiation and solvent-free conditions.

第二部分中，我们观察到，作为一种过程强化手段，微波具有显著的促进催化选择氧化反应加速进行的能力，这在多相的锰氧化合物体系和均相的钨酸钠—草酸催化体系中都有具体表现。

The pure and WO3-doped TiO2 nanoparticles photocatalyst was prepared by chemical precipitation, in which titanium tetrachloride was used as Ti-precursor, ammonia as precipitant and sodium tungstate as doping donor.

以TiCl4为钛前驱体，氨水为沉淀剂，钨酸钠为掺杂体给体，采用化学沉淀法，制备了纯的与WO3掺杂的TiO2纳米光催化剂。

M. McCarron III et al.(1984),4[2W12O38].6H2O, a colorless crystalline compound, was prepared by the reaction of white powdery tungstic acid with an aqueous solution of pyridine.

通过粉状白钨酸与吡啶水溶液反应成功地制备了一种无色的晶体(C5H5NH)4

METHODS: Using CB-HRP as tracer while using sodium tungstate as stabilizer of TMP to antrograde tracing the projection of optic nerve fibers on anterior region of hypothalamus and retrograde tracing the distribution of hypoglossal nerve fibers on the dorsal side of medulla.

采用结合了霍乱毒素亚单位B的辣根过氧化物酶作为示踪剂，用钨酸钠作为四氨基联苯胺显色剂的稳定剂，顺行追踪视神经纤维向下丘脑前区的投射；逆行追踪舌下神经纤维在延髓背侧的分布。

PTAH staining for striated muscle illustrated that 70-80% differentiated MSCs could be stained positively.

体外5-aza诱导分化MSCs后，应用磷钨酸-苏木素作横纹肌染色，发现所诱导的MSCs染色阳性率达70-80％。

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。