离子对

Methods Using acetamide as the internal standard,extraction column and extraction conditions of fluoroacetamide from blood and urine samples were optimized by comparing the extraction efficiency of different solid-phase extraction columns and the effects of experimental conditions on recovery.

选择乙酰胺为内标，通过比较不同固相柱的萃取效率和不同条件对回收率的影响，优化用于血和尿样中氟乙酰胺萃取的固相柱和提取条件，利用氟乙酰胺与乙酰胺质谱图的分子离子峰面积之比与氟乙酰胺浓度的定量关系，建立血和尿样中氟乙酰胺鼠药的GC/MS定量分析新方法。

Effects of different factors on the leaching of calcium from steel slag with acetic acid were investigated.

研究了不同参数对钢渣在醋酸溶液中钙离子溶出效率的影响。

Conversion and 79.1% ee were obtained for acetophenone under optimized conditions.

实验结果表明，离子液体介质中的纳米钌催化剂体系具有良好的催化活性和对映选择性。

The absorption spectra of the terpyridyl platinum acetylide complex containing monoazacrown moiety in the acetylide ligand was blue-shifted upon complexation with metal cations.

对位带有氮杂-15-冠-5冠醚的苯乙炔为辅助配体的三联吡啶Pt络合物TAC在金属离子的存在下吸收光谱的变化明显不同。

The preparation methods of sulfonated coal and factors such as sulfonation time, sulfonation temperature and ratio of acid to coal etc.

试验研究了褐煤制磺化煤的制备方法及磺化温度、磺化时间、酸煤比等因素对产物磺化煤的离子交换活性的影响。

Test research on the concrete resistance to chemical attack was conducted under different salt and acid attack condition.

对普通混凝土在各种盐类、酸类侵蚀介质作用下的抗化学侵蚀性进行了试验研究，测定了混凝土的侵蚀破坏率和混凝土中的氯离子含量。

The reaction process in methanol solvent can be deduced from the computational results with CPCM solvent model and the supermolecular handling, namely the reaction involves four steps in the methanol solvent. The nucleophilic addition of trimethylamine to acraldehyde generates an enolate. Nucleophilic attack of the enolate on the aldehyde forms the carbon-carbon bond, followed by the proton-transfer process and the further elimination generating the product and liberating the trimethylamine catalyst.

对于CH3OH对反应体系的影响，可以综合考虑CPCM溶剂模型及超分子模型下的研究结果，即CH3OH溶剂中反应按四步进行，催化剂三甲胺首先与丙烯醛发生亲核加成，生成的两性离子中间体与甲醛发生类似于Aldol的醛醇缩合，形成碳-碳键，之后发生分子内质子转移，最后经E1cb消除得到产物，并释放催化剂三甲胺。

The result indicates that nitrogen on Si/SiO2 interface reduces active energy and decreases the immunity for NBTI stress.

其结果表示氮离子在矽╱矽氧化层的介面上，会降低活化能，减小元件对於负偏压温度不稳定性应力的抵抗力。

The results show that both calcinations and pillaring can improve capability of modified rectorite to adsorb F〓.

结果表明煅烧和交联都能够明显提高钠基累托石对氟离子的吸附能力。

The film electrode shows a Nernst potential response for pH3—12 and electrode coefficient 57mV/pH.

该膜电极在pH3～12范围内对pH呈Nernst响应，电极系数为57mV/pH，对Li~+，Na~+，K~+三种离子具有较高的抗干扰性。

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。