查询词典 tungstic

Complete conversion for cyclopentene and high yield of 79.3% for glutaraldehyde are obtained over the W-HMS prepared with tungstic acid at optimum condition.

在n：n≥30时，催化剂能保持完好的HMS分子筛结构，W原子以嵌入HMS骨架的形式高度分散于载体内表面，构成催化活性中心。

The heterogeneous W-HMS catalyst was in-situ prepared by immobilization of tungstic acid on hexagonal mesoporous silica. It was used to synthesize glutaraldehyde from cyclopentene.

采用原位合成法将W(上标 6+)引入六方介孔全硅分子筛骨架中，制备了应用于环戊烯催化氧化合成戊二醛反应的W-HMS催化剂。

In the absence of organic solvent and phase-transfer reagent, the catalytic oxidation of cyclo- hexene to adipic acid with aqueous 30% hydrogen peroxide can be achieved in the presence of tungstic acid/acidic organic additive.

以钨酸/有机酸性添加剂为催化体系，在无有机溶剂、相转移剂的情况下，催化 30%过氧化氢氧化环己烯合成己二酸。当钨酸∶有机酸性添加剂∶环己烯∶过氧化氢=1∶1∶40∶176(摩尔比，钨酸用量为 2.5 mmol)时，使用有机酸性添加剂考察钨酸的催化性能，结果表明以钨酸/间苯二酚催化氧化环己烯的催化效果最优，反应 8 h 时己二酸分离产率达 90.9%、纯度为～100%；而不使用有机酸性添加剂时，己二酸分离产率只有 72.1%，产品纯度为 96.2%。

Commodities subject to export quota license are: corn, rice, wheat, cotton, wood products, live ox, live pig, live chicken, natural silk and its products, coal, coke, crude oil, finished oil, rare-earth metal, antimony oxide ore, antimony and antimony products, antimony oxide, tungsten ore, Ammonium Paratungstate, Ammonium metatungstate, Tungsten Trioxide and Blue Tungsten Oxide, Tungstic acid and salt, tungsten powder and its products, Zinc ores, Tin ores, tin and tin-base alloy, and white silver.

实行出口配额许可证管理的货物是：玉米、大米、小麦、棉花、锯材、活牛、活猪、活鸡、蚕丝类、煤炭、焦炭、原油、成品油、稀土、锑砂、锑及锑制品、氧化锑、钨砂、仲钨酸铵及偏钨酸铵、三氧化钨及蓝色氧化钨、钨酸及其盐类、钨粉及其制品、锌矿砂、锡矿砂、锡及锡基合金、白银。

The ultrathin cryosections and ethanolic phospho tungstic acid staining sections of rat atrial cardiocytes were prepared. Quantit ative electron probe Xray microanalysis of Hall continuum method was adopted to measure the alteration of Ca content in ASG at the exact time intervals of 15, 30, 60, 120 min after the adrenaline administration.

冷冻超薄切片技术和磷钨酸-乙醇特殊染色技术制备大鼠心房切片。X射线显微定量分析采用Hall连续谱法，用以测量在肾上腺素处理后15、30、60和120 min时ASG中钙含量的变化。

It is indicated that H2O2 and ethanol are coordinated with tungstic acid,which makes sols stable.

实验结果表明，双氧水和乙醇与钨酸络合，使溶胶稳定。

A salt of tungstic acid .

高氯酸形成的一种盐。

Effect of tungstic electrode argon arc hardening parameters on microstructure and mechanical properties of boron cast iron surface was investigated.

采用氩弧重熔技术在硼铸铁表面进行表面硬化改性处理，研究了钨极氩弧硬化工艺参数对硼铸铁表面组织和性能的影响。

The influence disciplinarian of scanning speed on tungstic electrode argon arc hardening effect on surface of boron cast iron was investigated.

研究了钨极氩弧扫描速度对硼铸铁表面硬化效果的影响规律。

A salt of tungstic acid .

亚硝酸形成的盐或酯。

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。