查询词典 ring

The influence of hydrophobic chains located at different positions on the benzene ring on the interfacial molecular behavior was investigated.

研究发现，苯环不同位置的取代烷基链长变化对扩张弹性模量和扩张粘性模量影响不同。

In the GC/MS analysis, lots of compounds containing benzene ring were detected.

在进一步的降解过程中，平菇表现了其自身特有的降解机制，取代苯环单体上的甲氧基为甲基，而后发生苯环的开裂，这与报道的白腐菌降解过程有所不同。

By introducing substitutents to a definite location of the benzene ring, the location and assembling fashion of nitrobenzene was defined.

通过在硝基苯的特定位置引入取代基我们可以确定硝基的位置和硝基苯的组装方式。

And 100%, respectively, under optimized reaction conditions. The existence of electron-donating groups on the benzene ring would enhance the activity of phenols.

使用苯酚作反应底物考察了各因素的影响，在优化的反应条件下，苯酚的转化率可达到99.8％，产物苯甲醚的收率高达99.8％。

In the earlier stage, hydroxyl radical does not attack benzene ring to produce phenolic compounds.

在氧化反应初期，OH自由基不直接攻击苯环而形成酚类物质。

The sulfate can also be attached to a benzene ring, making a sulfonate

硫酸盐可连在苯环上，结构如图4.2-1所示。

Chemistry A group of atoms bound in a structure, such as a benzene ring, that is resistant to alteration in chemical reactions.

环核：包围在抗化学反应变化的结构中的一组原子，如苯环

Dozens of analogues with modification at benzene ring were synthesized by using a metal-catalysis coupling.

另外，采用金属催化的偶联反应我们合成了苯环区取代的一系列类似物。

However, benzene ring is not chemically stable, it will form various compounds with other chemicals especially hydrocarbons.

不过 benzene ring 化学上并不稳定，所以容易跟其他物质形成化合物，例如碳氢化合物。

The effect of dissociation on the photolysis should be mainly attributed to the formation of the negative oxygen ions,which led to the changes of the activities of benzene ring and substituent groups.

解离对酚类物质降解规律的影响主要是通过氧负离子的形成，改变苯环以及其他取代基团的活性而造成的。

More clues to Coryphodon's lifestyle came from an analysis of ratios of carbon-13 to carbon-12, which exists in different ratios in various types of plants.

更多与冠齿兽生活习性有关的线索来自对碳-13与碳-12比例的分析，它们在不同类型的植物中有不同的比例。

Acetone has been in common use as a solvent and as an extracting regent, in industry for several decades. It is easy to evaporate in air. When the concentration of acetone in air is higher than 10,000 ppm, people may experience such symptoms as cephalalgia, nausea and so on.

由於丙酮是工业上广泛应用的溶剂，它极易挥发，且当人体曝露在高浓度的丙酮下，会有头痛、困倦及呕吐等症状，所以丙酮感测器可应用於工业的环境检测。