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Take Pb〓 as an example, its detection limit is 8×10〓mol/L. The research on mechanism of this method shows that these achievements was caused by the characteristics of silver disc electroxidation and electroreduction and ACOC.

对该法的机理做了较深入的探讨，表明该方法灵敏度高、稳定性重现性好的原因是银盘电极的氧化还原性质和交流示波计时电位法的特点共同所致。

In the fourth chapter, the effects of ultrasound on the direct electrosynthesis of solid K_2FeO_4 and the anodic behaviors of pure iron were investigated, and the physical properties of the samples were characterized by means of XRD, FTIR and SEM.

在第四章中，对超声波在14 mol／dm~3 KOH溶液中辅助直接电合成K_2FeO_4固体的影响作了研究，并采用扫描电子显微镜、X-射线衍射和傅立叶红外吸收光谱等技术对超声波作用和无超声波作用直接电合成的K_2FeO_4的表面形貌和结构进行了表征。

The experimental results showed that the existence of ultrasound could decrease the formation potential of ferrate and the passivation extent of iron anode, as well as O_2 evolution rate, which led to higher current efficiency for the direct electrosynthesis of solid ferrate at 65℃in 14 mol/dm~3 KOH solution.

通过对超声波对纯铁电极电化学行为影响的研究表明，超声波能加快电极表面上的固体K_2FeO_4向本体溶液中的转移和延缓电极表面的钝化，还能减慢O_2析出的速度，这可能就是超声波作用能够提高固体K_2FeO_4生成的电流效率的原因。

XPS experiments showed that zirconia sample possesses a 2p electron binding energy of phosphorus at 132.95 eV after the zirconia was treated with DNA solution, which showed that DNA was adsorbed onto this zirconia; TEM images showed that DNA appears in emanant on zirconia particle.

研究了镧离子、铕离子及钙离子对DNA电子传递速率的影响，用Tafel方程计算了动力学速率常数。结果表明，在金属离子的浓度均为1.0×10〓mol/L时，分别加入铕离子、镧离子及钙离子，其动力学常数分别是原来的2.91倍、2.26倍及1.45倍，其增加的顺序是Eu＞La＞＞Ca。

L. mol〓. s〓 The active site of EPC-K1 was the enolic hydroxyl group.

EPC-K1抗氧化作用的活性位点是分子中的烯醇羟基。

Enzymic method and spectrophotometric method were used to determine the activity of iNOS in cultured supernatant.

结果：与对照组比较，不同浓度的吲哚美辛（30、60、125和250 μmol·L-1）组Hep-2细胞增殖的抑制率均显著增加（P.05）。

On an equimolar basis (100 mol/kg), nalbuphine base produced a 6-fold increase in the duration of action than did nalbuphine HCl.

在相同的给药剂量下（100微莫耳／公斤），新型注射液比传统注射液延长了6倍的止痛效期。

Defatted fruit bodies of Hericium erinaceus were extracted with 1 mol/L NaOH to obtain alkali-soluble polysaccharide.

脱脂猴头菇子实体经热水处理去除水溶性多糖后用碱溶液进行抽提得到碱溶性多糖。

The analysis shows that, the larger the mol value of ethylic sequence in high molecule chains, the higher the low-temperature viscosity, the worse the low-temperature starting performance and pumpability.

通过分析得出：随着高分子链中丙基序列所占摩尔分数的增大，低温粘度变大，低温启动和泵送性能变差；而随着乙烯基含量的增加，低温粘度下降，低温性能变好。

The invention relates to a catalytic cracking catalyst with faujasite. Wherein, it comprises high-silicon-aluminum faujasite at 5-95%, and fusion-resistant oxide at 5-90%; the mol ratio as SiO2/Al2O3 of faujasite is 6-20; it is Y-type zeolite, whose particles have sheet shape.

本发明涉及一种含八面沸石的催化裂化催化剂，以重量计含有高硅铝比八面沸石5％-95％，耐熔氧化物5％-95％，其中八面沸石的SiO2/Al2O3摩尔比为6―20，属于八面沸石中的Y型沸石，并具有片状形貌。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。