钨酸

Cyclohexanone ethylene ketal was synthesized from cyclohexanone and glycol in the presence of H3PW12O40/MCM-48. The factors influencing the synthesis of molar ratio of glycol to cyclohexanone, the quantity of catalyst and the reaction time were discussed and the best conditions were found out.

报道了以分子筛MCM-48负载磷钨酸(H3PW12O40/MCM-48)为催化剂，通过环己酮和乙二醇反应合成了环己嗣乙二醇缩酮，探讨了H3PW12O40/MCM-48对缩峒反应的催化活性，较系统地研究了酗醇物质的量比，催化剂用量，反应时间诸因素对产品收率的影响。

The optimum reaction conditions were: at present of acetic anhydride, a stoichiometric quantity of nitric acid, at room temperature for 40 minutes. Nitration of chlorobenzene gave a,50% yield of mononitro compounds, and an ortho-para isomer ratio 0.20 in product distribution of chlorobenzene mononitration.

结果表明：硅钨酸催化性能较好，催化剂载体以纳米二氧化硅最好，反应条件中醋酸酐用量是主要影响因素；SiW_(12)O_(40)~(4-)／纳米SiO_2催化剂具有强对位选择性：在醋酸酐存在下，氯苯与等当量的硝酸室温下反应40分钟，氯苯一硝化产物中邻／对硝基氯苯异构体的质量比达0.2，产率可达50％。

The sol-gel solution was prepared by mixing ethyl orthosilicate, absolute alcohol and 0.1molL^(-1) HCl in a definite proportion, and adding an appropriate amount of silicotungstic acid as active material, strring for 30min and then standing for 24h at room temperature.

溶胶－凝胶溶液系将正硅酸乙酯、无水乙醇及0.1molL^(-1)盐酸按一定比例混合后加适量的硅钨酸作为活性物质，搅拌30min混匀后在室温放置24h配成。

The method of series rate is used to study the linear growth order of ammonium paratungstate crystal.

将结晶成核期后晶体的生长阶段作为线生长速率测定的时间范围，采用&串联速率法&研究了仲钨酸铵的晶体线生长级数。

In the paper, the linear growth order of ammonium paratungstate crystal is studied by the "method of initial rate".

应用&初始速率法&研究了仲钨酸铵晶体的线生长级数。

Tungsten trioxide powder has been prepared from ammonium paratungstate v/a hydrothermal method using orthogonal and mono-level design of experiments.

以仲钨酸铵为原料，通过正交设计和单水平实验，采用水热法处理制备了WO3粉体。

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。

Chitosan and phosphotungstate acid were fabricated on solid substrates by means of layer-by-layer electrostatic self-assembly technique.

将正电荷的壳聚糖与负电荷的磷钨酸溶液通过静电作用交替沉积在基底上组装复合多层膜。

A novel preparation method to synthesize DEDB by using aluminium phosphotungstate catalyst was developed.

蒋维开发了一种用磷钨酸铝催化合成二甘醇二苯甲酸酯的新方法。

The proportion of GGT complexed with low density lipoproteins plus very-low density lipoproteins in total GGT in serum is determinated with ratio colorimetery,sodium phosphotungstate and MgCl2 as precipitation.26 patients with liver cancer,18 with liver cirrhosis,22 with chronic hepatitis,14 with the other malignant tumors,16 with non-hepatobiliary disease of high GGT and 50 healthy subjects have been evaluated.

本文以磷钨酸－氯化镁作沉淀剂，速率法测定血清低密度脂蛋白，极低密度脂蛋白结合的r－谷氨酰转移酶（LDL－VLDL－GGT）占总GGT的百分比。对临床26例肝癌、18例肝硬化、22例慢性肝炎、14例其他恶性肿瘤、16例GGT升高的非肝脏疾病及50例健康人进行了检测，结果表明：肝癌组明显高于其他各组，差异显著（P＜0.01）。肝脏疾病升高幅度：肝癌＞肝硬化＞慢性肝炎，且每两者间有显著差异（P＜0.01）。

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。