electron的例句大全

The results showed that dyes with strong electron-withdrawing group, asymmetrical structure and short alkyl chain substituents have better bleaching properties.

结果表明，油溶性染料分子中，取代基团的吸电性强，不对称性大，取代基含脂肪链短的，其漂白性能好。

Ester bond as an electron-withdrawing group could undergo as well, so the compound by ester bond connecting occurred more reduction process than ether bond connecting.

由于酯键作为一个吸电子基可以促进还原反应的发生，通过酯键连接的化合物比通过醚键连接的化合物出现更多的还原峰值。

By contrast, the exo adduct possesses a trans relationship between the dienophile electron-withdrawing group and the trans diene substituent.

相反，不能进行成环加成反应的反应物有吸电子基团的二烯和二烯烃取代物具有反式结构。

The catalytic system also showed good catalytic activity in the oxidation of other aldehydes. Benzaldehyde derivatives with electron-withdrawing group and aliphatic aldehydes were almost quantitatively converted into their corresponding acids.

应用此催化体系催化其它醛的氧化同样表现出较好的催化活性，有缺电子取代的芳香醛和脂肪醛几乎定量生成相应的羧酸。

In chapter 2, we designed and synthesized two novel series of organic dyes by incorporating NC-CH2-COOH as electron withdrawing group at the carbonyl positions of QA skeleton.

在第二章中，我们通过在QA骨架的羰基位置引入吸电子基团NC-CH2-COOH设计并合成了两个系列新颖的有机染料。

Substitution of the aromatic hydrogen atom of the Schiff base ligand with electron withdrawing group decreased the amount of the complex encapsulated in the zeolite cavities, but could improve the catalytic activity of the encapsulated complex.

席夫碱芳环上的H被吸电子基团取代后，降低了Y分子筛超笼中封装的钴配合物的量，但能改善催化活性。

The macroporous, strongly acidic, high thermally stable canon exchange resin catalysts were synthesized in the steps of polymerization of styrene and divinylbenzene, purifying copolymer, introducing electron withdrawing group, sulfonation and stabilizing active sites.

通过苯乙烯与二乙烯苯聚合、共聚物纯化、引入吸电子基团、磺化、活性基因稳定化过程，合成耐温强酸阳离子交换树脂催化剂。

The [ ( 4-fluoro phenyl) methoxy] acetic acid derivatives ( 5~ 9) were prepared in order to compare electron withdrawing group F with Cl, Br and I in substituted ( phenyl methoxy) acetates the effects of tor learning and memory facilitation in mice.

为研究吸电子基-氟，对苯甲氧基乙酸酯类小鼠学习记忆促进作用的影响，合成了（4-氟苯甲氧基）乙酸衍生物（5～9）。

It can be provided with some information on studying of the relationship between physical properties and chemical structure by introduction of the electron-withdrawing groups to the nitrogen of aniline.

为进一步研究在氮的位置上引入吸电子基团的聚苯胺类衍生物的物理性质与化学结构之间的关系提供了依据。

The Electron-withdrawing Effect of the Nitrogen Atom of Pyridine

吡啶环中N-原子的吸电效应

Electron microscopic study on the alveolar epithelium of the goat fetus

山羊胎儿肺泡上皮的电镜观察

Single Electron Detachment of Li~-and Na~-in Collision with He, Ne and Ar

Li~-和Na~-单电子解离过程的研究

Research on Interaction of Photodetachment and Scattering Between Atomic Oxygen and Low Energy Electron

慢电子与氧原子之间相互作用&光分解和散射的研究

Methods The ultrastructural pathological changes of syphilitic chancre were examined with transmission electron microscopy.

方法在透射电镜下观察梅毒硬下疳组织细胞超微病理变化。

A proton positive charge and an electron a negative charge, but a neutron has neither.

质子带正电,电子带阴电, 而中子既不带正电,也不带阴电.

Methods To incubate the caries free permanent teeth with acid gelatinoid and/ or collagenase, then to observe the ultrastructural change of root surface under scanning electron microscope.

方法将无龋恒牙分组经酸性胶液和胶原酶分别或共同孵化处理后切割制样，脱水干燥，喷金，扫描电镜观察根面超微结构的变化。

In anoxic condition, denitrifying polyphosphate accumulating organisms ( DNPAOs) can simultaneously denitrify and excessively remove phosphorus by using nitrate as terminal electron acceptor.

反硝化聚磷菌可以在缺氧条件下，利用硝酸盐作为电子受体，实现同步反硝化和过量吸磷。

Determination of 1,1,1 trichloroethane in industrial waste gas by gas chromatography with electron capture detector was conducted.

采用带有电子捕获检测器的气相色谱仪测定工业废气中的1，1，1－三氯乙烷。

The balance depends on a number of environmental variables including electron doping.

它们之间的平横依赖包括电子掺杂在内的许多环境变量.

It is found electron temperature and nano pore structure can change the ion deposition rate effectively.

结果表明电子温度以及纳米孔洞结构能够有效改变离子的沉积率.