研究了以阳离子改性的丝光沸石为催化剂，以氨和甲醇为原料，在常压固定床上二甲胺选择性合成反应。
The select(?)ve synthesis of dimethylamine from ammonia and methylalcohol using the cation modified mordenite as catalysts on atmospheric pressure fixed bed have been studied.
考察了催化剂焙烧温度、空速、碱含量、反应温度和不同阴、阳离子改性对催化剂活性和选择性的影响。
Effects of calcination temperature, space velocity, base content, reaction temperature, modification of various ions on the reactivity and selectivity of the catalysts were examined.
采用阴离子捕收剂油酸钠将矿石中的石英和方解石浮选分离以后，采用阳离子捕收剂醚胺浮选绿泥石时呈现出良好的选择性。
After the separation of quartz and calcite by flotation using anionic sodium oleate, cationic ether amine collector was used to float the chlorite, which exhibited a good selectivity.
介绍了一种利用阳离子化改性多羟基化合物进行堵水调剖的方法，具有一定的选择性，在油田应用取得了良好效果。
A modified cationic polyhydroxy compound gelling fluid as water shutoff is developed. This type of gel has better selectivity. Its field tests are described and the results are satisfactory.
绝大多数TRP离子通道为非电压依赖性、非选择性阳离子通道。
Most of the TRP channels are voltage independent and non selective cation channels.
骨架呈负电性，具有可交换的阳离子，被广泛用作吸附剂、催化剂和催化剂载体，是一种具有优异择形选择性、热稳定性和湿热稳定性的新型催化材料。
SAPO is a novel class of catalytic materials which exhibit excellent shape selectivity, thermal stability and hydrothermal stability, which can catalyze hydrocarbon reactions.
结果表明，采用选择性絮凝脱泥-阳离子反浮选流程闭路试验可获得铁精矿品位为65.50%，回收率为83.09%的较好指标。
The results showed that, an iron concentrate with a TFe grade of 65.50% and a recovery of 83.09% can be obtained by the closed-circuit bench test.
结果表明，采用选择性絮凝脱泥-阳离子反浮选流程闭路试验可获得铁精矿品位为65.50%，回收率为83.09%的较好指标。
The results showed that, an iron concentrate with a TFe grade of 65.50% and a recovery of 83.09% can be obtained by the closed-circuit bench test.
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