醚的

The study of fluorescence spectrum proved that the excited phenylenerings of amorphous PES copolymer with high density phenylenerings in its main chain could form an excimer with the surrounding unexcited phenylenerings, and the emission peak intensity of excimer was strengthened with the increase of aging time.

荧光光谱的研究证明，非晶态聚醚砜共聚物由于主链苯环密度较高，苯环受激处于激发态时易与周围激态苯环相互作用形成激基缔合物，缔合物发射峰的强度随老化时间增加而增强。

The study of fluorescence spectrum proved that the excited phenylene-rings of amorphous PES copolymer with high density phenylene-rings in its main chain could form an excimer with the surrounding unexcited phenylene-rings, and the emission peak intensity of excimer was strengthened with the increase of aging time.

荧光光谱的研究证明，非晶态聚醚砜共聚物由于主链苯环密度较高，苯环受激处于激发态时易与周围激态苯环相互作用形成激基缔合物，缔合物发射峰的强度随老化时间增加而增强。

The S-PEU as well as H-PEU had a soft segment-rich surface as shown by ESCA study. The recalcification times for S-PEU and H-PEU increased 20% and 100%, respectively,as compared with that of ungrafted PEU.

ESCA及抗凝血性研究结果表明，不同位置接枝的PEU，其表面都有明显的聚醚链段富集。S－PEU抗凝血复钙时间只比未接枝者增长约20％，而H－PEU则增约一倍，比S－PEU增约60％。

The effects of hard segment content on the microstructure and viscosity of polyether PU and PUU were studied by FT-IR, DSC, viscosimeter.

利用FT-IR，DSC，旋转黏度计研究了硬段含量对聚醚型PU和PUU的微观结构及黏度的影响。

The acetated and hydrogenated urushiol dimer has been separated,and studied by hetero-J resolved 2D-NMR,homo- and heteronuclearchemical shift correlation 2D-NMR and long-range coupled chemicalshift correlation 2D-NMR.The results show that the urushiol dimerare most diphenyl and alkyl phenyl ether structures.Furthermore,IR and MS data also has conformed this structures.

本文将酶催化预聚后的生漆，催化加氢后，乙酰酯化，再进行离心旋转薄层层析，分离得到二聚体主要组分，用异核J分辨谱，同核化学位移相关，异核化学位移相关，远程偶合异核化学位移相关等2D—NMR技术，全面研究了其结构，得到了联苯型和烷基芳醚型聚合结构的结论。

From Acropora pulchra and Porites Compressa Dana,a mixture of sterol has been isolated respectively.

从佳丽鹿角珊瑚乙醇提取液的乙酸乙酯部分和扁缩滨珊瑚乙醇提取液中的石油醚部分各分离出一甾醇混合物。

The two chiral centers of these compounds were also built by using Evans asymmetric aldolization.

在最后一部分的工作中，研究了IBX在选择性脱硫醇和TES硅醚保护基中的应用。

And TOF of catalytic oxidation for styrene to benzaldehyde has increased by 100%～240% because of the addition of alkalic ion, which matches with the crown ring.

系统考查了冠醚环及其直径大小、结构类型、键连方式、键连部位和与活性中心的距离对配合物催化氧化性能的影响。

Copolymers with the naphthoyimine chromophores were firstly obtained through Pd-catalyzed Heck reaction. The copolymers had good solubility in common solvents due to the presence of alkoxyl substituents in the molecular chains.

在钯催化下利用Heck耦合反应制备了以萘酰亚胺为发色团的共聚物，通过侧链上引入丁氧基醚链，使得聚合物具有很好的溶解度，能溶解在常用有机溶剂中。

Halohydroxylation reaction of allenyl sulfides occurs predominately with the β,γcarbon-carbon double bonds with the halogen atom bonded to the middle carbon atom of the allene moiety.

在1，2-联烯基硫醚分子中由于同时存在着硫原子和具有两个相互垂直π-键的累积双烯结构，使其具有一些特殊的反应性能。

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。