na2so4

The introduction relates to current situation of resources of Na2SO4 and its exploitation and utilization at home and abroad .

介绍了国内外硫酸钠矿产的资源、开发和利用情况。

Studied the luminescence properties of Na2SO4 : Dy3 + by synchrotron radiation .

通过同步辐射研究了Na2SO4：Dy3+的发光性质。

The experimental study of concentration and recovery of sodium sulfate ( Na2SO4 ) from its solution was done with electrodialysis process .

本文介绍了采用离子交换膜电渗析法对硫酸钠溶液进行浓缩回收的试验研究。

The inhibition to be seed germination was NaCl > natural soil salt solution > Na2SO4 . With the increasing of salts , the germination percentage had different decrease .

对其种子萌发的胁迫作用是NaCl>土壤溶液>Na2SO4。

The temperature range of the eutectic mixture formation for KCl – K2SO4 – Na2SO4 system was tested and illustrated by chemical agents and an experimental electrical stove .

用化学试剂和实验电炉进行实验，绘制了KCl–K2SO4–Na2SO4低温融体形成的温度范围图。

The activity of Na2SO4 can improve the performance of low-active flyash , such as improving the early strength , reducing cracks , shorting construction period and ensuring the construction quality .

用硫酸钠添加剂的方法改善低活性粉煤灰，可以提高二灰碎石的早期强度、减少裂缝、缩短施工周期，并保证施工质量。

The properties of composite membrane using different base membrane are commented . The results indicate that the composite membranes with small pore size exhibit superior separation performance on the rejection of Na2SO4 > 90 % .

结果表明：用小孔径的合金膜为基膜得到的复合膜具有较好的脱盐能力，对Na2SO4的脱除率达到90%。

It was shown that iron in Na2SO4 + Cl-solution exhibited active - passive-transpassive characteristics in the presence or absence of magnetic field , although Cl - in the solution would hinder the formation of passive layer .

结果表明：有、无磁场下铁在含Cl~-的Na2SO4溶液中的阳极极化曲线都呈现活化-钝化-过钝化特征，虽然Cl~-会阻碍钝化膜的形成过程；

In this paper , the active fly ash was obtained by procee - ding activation treatment for low grade fly ash with adopting the only mechanical grinding and the mechanical grinding plus chemical activator ( NaOH 、 Na2SO4 ) .

本文采用单独机械磨细和机械磨细与化学激发剂（NaOH、Na2SO4）相复合的方法来提高低等级粉煤灰的活性。

Fracture mechanism of concrete subjected to bittern attack and freezing-thawing simultaneously could be summarized as stresses induced by crystallization of Na2SO4 · 10H2O . Fractures would occur abruptly for concretes subjected to loads and salt crystallization at the same time .

Na2SO4.10H2O等盐类的结晶压作用是混凝土在盐湖地区腐蚀&冻融的破坏机理，当混凝土同时受到盐结晶压和荷载作用时突然断裂是其破坏特征。

The luminescence intensity and chromaticity of the Eu3 + reached its highest in case of mixing Gd3 + , 21mol % , into Thenardite ( Na2SO4 : Eu ) crystal lattices , and Concentration quenching effect ultimately occurred .

当Gd3+以21mol%掺入到无水芒硝（Na2SO4：Eu）晶格中时，可以达到Eu3+的最强发光强度和最佳色纯度，最终出现浓度淬灭现象。

The hot corrosion behaviors of the cast alloy and the aluminide coatings were examined in molten salt film ( 75wt % Na2SO4 + K2SO4 ) at 900 ℃ by TG , SEM / EDS , XRD and EPMA .

采用热重法及SEM/EDS、XRD和EPMA研究了铸态合金和涂层在900℃熔盐（75wt%Na2SO4+K2SO4）中的热腐蚀行为。

Through analyzing the effect of the Na-salt solution on the superweak luminescence of pea ( pisum sativum ) during the germination , we found that the luminescence intensity of Pea was Na2CO3 > NaCl > Na2SO4 on condition isopotential basis of salt stress .

通过钠盐对豌豆（Pisumsativum）萌发时超弱发光影响的比较研究表明，在等渗条件下豌豆幼苗受激发光强度顺序为Na2CO3>NaCl>Na2SO4；