阳离子的

Using pentaerythritol as initiator, boron trifluoride diethyl etherate as catalyst.dichloroethane as dispersion agent, the chloride polyether polyol is synthesized based on the mechanism of cationic ring-opening polymerization of epiclilnrohyclrin.The azide polyether polyol is synthesized, in DMF through A and sodium azide, and the non-reported azide energetic curing agent is synthesized through the adduction of B and IIDI.

以季戊四醇为起始剂，三氟化硼乙醚为催化剂，1，2—二氯乙烷为分散剂，环氧氯丙烷经阳离子开环聚合反应制成氯化聚醚多元醇，A在N，N—二甲基甲酰胺中与叠氮化钠反应制得叠氮聚醚多元醇，B与六亚甲基二异氰酸酯加成反应制得未见文献报道的叠氮固化剂。

Between the ages of 20 and 70, one-third of those cells die and are not replaced in men," said Goldspink."

D。胶体微粒具有较大的表面积，能吸附阳离子或阴离子，在电场作用下产生电泳现象

In this paper,the strong acid cation exchange resin has been studied as the catalyst for the esterification of gulonic acid .

选用强酸性阳离子交换树脂代替浓硫酸催化剂，对古龙酸的甲酯化反应进行了探索性研究。

As for fine-grained Ta-Nb mineral, the flotation is generally adopted, and effective collectors is fatty acids, arsenic acids, phosphonic acids, hydroximic acids and cationics.

对细粒钽铌矿，一般采用浮选，其中比较有效的捕收剂有脂肪酸类、胂酸类、膦酸类、羟肟酸类和阳离子型捕收剂。

The experimental results showed that when AcO-or other anion s were added to a solution consisting of 1,5-(di-benzaldehyde) dithiocarbohydrazone and Hg2+(at a ratio of 1∶2),a hypsochromic shift took place on the maximum ultraviolet absorption peak of the ligand.

设计合成了配体1，5-二双缩二氨基硫脲及其金属配合物，探讨了不同金属阳离子对1，5-二双缩二氨基硫脲紫外吸收光谱的影响，并将标题化合物应用于阴离子识别。

The Chapter 2 also shows the reactions of a diiron cationic bridging carbyne complex with N-containing nucleophile such as LiNEt〓 to give the arylcarbene complex 〓.

在含氮亲核试剂LiNEt〓与阳离子桥卡拜络合物反应中，生成桥卡宾碳上键合氢的双铁桥卡宾络合物。

The three kinds of potato dietary fibers from potato pulp were produced by acid reagents, mesothermal temperature amylase and high temperature resistant amylase respectively.

本研究采用酸处理、中温α-淀粉酶处理和耐高温α-淀粉酶处理三种工艺条件制得三种马铃薯膳食纤维产品，对三种样品与市售燕麦纤维的膨胀力、持水力和阳离子交换能力进行了测定。

The method of suceessive cation-exchange and RP-HPLC can efficiently purify CTX without PLA2 from Naja naja atra venom.

结论结合阳离子交换层析和RP—HPLC可从眼镜蛇毒中高效分离获得不舍PLA2的CTX。

Experiments with methoxy substituents exclude the possible involvement of naphthyl cations as reaction intermediates in the cyclization of (o-ethynylphenyl) alkynes.

实验甲氧取代排除参与的可能性萘阳离子反应中间体中环（邻ethynylphenyl ） alkynes。

The influence of cation and nonion surfactants on the preferred orientation was complicated.

阳离子和非离子表面活性剂对镀镍层的晶面取向影响比较复杂。

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。