1、

the reason why the bezene-ring hydrogen atoms are easier to be substituted than that of hydroxy group for the molecule phenol

苯酚的羟基难被取代而其苯环上的氢原子却易被取代的原因

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2、

Ordered structures in nature aggregates many senior composition dependence of weak intermolecular interaction, such as hydrophobic interactions, electrostatic interactions, hydrogen bonding, van der Waals, aromatic ring stacking and so on.

自然界很多高级有序结构聚集体的构成依赖分子间的弱相互作用力,例如疏水相互作用、静电相互作用、氢键、范德华力、芳环叠加等。

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3、

By introducing the carboxyl on starch sugar-ring, the hydrogen bonding and electrostatic interaction between oxidized starch ( OST) and PVA were enhanced.

通过酸性高锰酸钾的氧化在淀粉的糖环上引入羧基,利用羧基强的电负性来增强氧化淀粉(OST)和聚乙烯醇之间的氢键作用力,改善它们的相容性。

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4、

Carbon, Hydrogen Oxygen Isotope Studies on Imbedded Old Tree Ring and Paleoclimate Reconstruction

埋藏古木树轮碳、氢、氧同位素研究与古气候重建

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5、

Results suggested that the four-membered ring of nopyl acetate cleaved first, then hydrated. Other products were mainly obtained from epoxidation of the double bond, and further oxidation of tertiary hydrogen on C_ (-1) and C_ (-5).

对反应产物的分析结果表明:反应主要是四元环开裂,并进一步水合,另外伴有少量双键环氧化的产物,这些环氧化的产物还可进一步在C-1和C-5处发生叔氢氧化。

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7、

hold a hydrogen balloon instead of a swim ring in the sea.

牵一个氢气球代替游泳圈在海里游泳。

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8、

liquid ring compressor is applied to compress hydrogen

液环式压缩机机组应用于氢气压缩

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9、

Application of stress ring in test of controlling hydrogen embrittlement

应力环在氢脆控制试验中的应用

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