钨酸

Although be in short-term inside , the United States can offer the benefit in be more than the condition that seek from the inventory of primary tungsten product such as acid of concentrate , tungsten and oxidation tungsten as before many , but should realise , get primary tungsten incontinently to taste inventory from other area , then have a change of luck goes to the United States such the market puts in in order to sell a system of fixed quotas for grain production in the country , as a result changes the practice that supply and demand balances , give the place inevitably of all kinds the industry related to tungsten brings menace .

虽然在短期内，美国依旧能够从精矿，钨酸与氧化钨等初级钨制品库存供大于求的形势中获益不少，但是应该熟悉到，从其它地区无节制地获取初级钨品库存，进而转运到美国这样的以销定产国家中并投放市场，以致改变供需平衡的作法，将不可避免地给该处各类与钨相关的行业带来威胁。

Said lead tungstate crystal comprises tungsten oxide, lead monoxide, ytterbium oxide and zinc oxide; the molar ratio between tungsten oxide and lead monoxide is 1: 1, the doping amount of ytterbium oxide is 50 -300 ppm of the total weight of tungsten oxide and lead monoxide, the doping amount of zinc oxide is 50 -1050 ppm of the total weight of tungsten oxide and lead monoxide.

Yb和Zn双掺杂钨酸铅晶体由氧化钨、氧化铅、氧化镱和氧化锌制成；氧化钨与氧化铅的摩尔比为1∶1，氧化镱的掺杂量为氧化钨和氧化铅总质量的50～300ppm，氧化锌的掺杂量为氧化钨和氧化铅总质量的50～1050ppm。

The IR spectra indicated that the functional group—COO〓 in PASP linked to the surface of carbon steel. The pitting corrosion inhibition of tungstate and BTA on carbon steel and the passivation of carbon steel in solutions containing sodium borate were studied by the measurement of polarization curves and the curves of current vs.

失重法研究钨酸钠与聚天冬氨酸对碳钢的协同缓蚀效应发现，钨酸钠与PASP对自来水中的碳钢有协同缓蚀作用，加入锌离子可产生进一步的协同作用，碳钢表面分析表明：聚天冬氨酸是以羧基在碳钢表面成键。

The results show that the dissoluble tungstate can be impregnated into the pores of C/C composite materials....

研究结果表明，用浸渍法可将可溶性钨酸盐浸渍到炭/炭复合材料的孔隙中，将浸入炭/炭复合材料中的钨酸盐还原成金属钨可以在一定程度上改善炭/炭复合材料在X射线下的可视性。

The effects of catalyst dosage, the amounts of hydrogen peroxide and phase transfer agent, the pH value of the solution, the reuse of catalyst and the reaction temperature on the azelaic acid yield were investigated.

以30%过氧化氢作为氧化剂，在相转移试剂和磷钨酸催化剂作用下催化油酸制备壬二酸，考察了催化剂磷钨酸用量、过氧化氢用量、溶液pH值、相转移试剂用量、反应温度等因素对壬二酸产率的影响。

A traditional acidification method incorporated with an ether extraction technique was used to prepare silicotungstic acid and phosphotungstic acid with Keggin structure.

采用盐酸酸化-乙醚萃取法制备了Keggin型硅钨酸、磷钨酸，并分别以活性炭和硅胶为载体，采用不同的制备方法制备出一系列负载型杂多酸。

Under the excitations of Ultraviolet, X-ray, cathodic ray, etc. tungstates can produce blue emission, and molybdates can generate green light. Hence, scheelite-structured tungstates and molybdates are used in the fields of detections for high energy particles, scintillant arithmometers, X-ray gain screen, luminescence and displays.

在紫外、X射线、阴极射线等的激发下，钨酸盐能发射出蓝光，钼酸盐能发射出绿光，因而白钨矿结构的钨—钼酸盐在高能粒子探测、闪烁计数器、X射线增感屏、发光与显示技术等领域具有重要的应用。

The reaction results show that the catalytic activity and selectivity of W-HMS prepared with tungstic acid is better than that prepared with sodium tungstate. And the consumption of t-BuOH also is successfully reduced.

实验结果表明：钨酸是制备W-HMS催化剂很好的钨源，以钨酸为原料制备的催化剂具有很高的催化活性和选择性，使溶剂叔丁醇用量大为减少。

Comparing the two kinds of catalyst, although the high conversion could been gotten at the optimum reaction conditions respectively, to the same conversion, the reaction conditions for ammonium molybdate catalyst were higher than that for sodium tungstate catalyst, that means the catalytic activity of ammonium molybdate is higher than that of sodium tungstate.

两种催化剂相比，虽然在最佳工艺条件下，均可使反应达到较高的转化率，但达到相同转化率时钨酸钠催化剂所需的反应条件比钼酸铵催化剂高，所以总体来说，钼酸铵催化剂的反应活性高于钨酸钠催化剂。

Now has 5,000 tons of ammonium perchlorate, blue tungsten oxide, tungsten oxide yellow; 3000 tons of tungsten powder, tungsten carbide powder production capacity.

现拥有5000吨仲钨酸铵、蓝色氧化钨、黄色氧化钨；3000吨钨粉、碳化钨粉的生产能力。

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。