查询词典 ethylene

Moreover, The melting point of the copolyesters PBEST is much higher than that of the poly (butylene succinate –co-ethylene succinate).

PBEST综合了PET具有高的拉伸强度及PBES具有高的断裂伸长率的特点，因而具有优异的机械性能。

In the catalytic pyrolysis process, the summary yield of ethylene, propylene and butylene reaches 51. 54wt%, indicating the prospective future for application of downer reactor in this process.

此外，下行床催化热裂解过程中的乙烯、丙烯和丁烯三种烯烃的总收率达到51.54wt％，显示出了良好的研究开发前景。

In this thesis, the mechanism of endogenetic ring forming reaction in the cationic polymerization of THF、 butylene oxide and ethylene oxide was investigated.

研究结果表明，环氧乙烷比四氢呋喃更容易发生分子内尾咬、扩环反应。

In this disseration, the cationic ring open-polymerization mechanism of THF、 butylene oxide and ethylene oxide were studied on the basis of electronic microstructures by using quantum chemicl method.

本文选取四氢呋喃、环氧丁烷和环氧乙烷的阳离子开环聚合为研究对象，运用量子化学方法从微观层次上对烷氧基化开环聚合过程进行了较为全面的研究。

"Rare in nature, olefins are obtained by the cracking of petroleum fractions at high temperatures. The simplest ones (ethylene, propylene, butylene, butadiene, and isoprene) are the basis of the petrochemical s industry."

烯烃在自然界很稀少，但在石油裂解成汽油过程中可大量生成，低级的单烯烃已成为庞大的石油化学工业的基础。

"Rare in nature, olefins are obtained by the cracking of petroleum fraction s at high temperatures. The simplest ones (ethylene, propylene, butylene, butadiene, and isoprene) are the basis of the petrochemicals industry."

烯烃在自然界很稀少，但在石油裂解成汽油过程中可大量生成，低级的单烯烃已成为庞大的石油化学工业的基础。

"Rare in nature, olefins are obtained by the cracking of petroleum fractions at high temperatures. The simplest ones (ethylene, propylene, butylene, butadiene, and isoprene) are the basis of the petrochemicals industry."

烯烃在自然界很稀少，但在石油裂解成汽油过程中可大量生成，低级的单烯烃已成为庞大的石油化学工业的基础。

This product and PVC and ethylene vinyl acetate copolymer has good histocompatibility, but also acrylic and poly methyl methacrylate, polyvinyl butyral, nitro cellulose, ethyl butyl acetate fibers and cellulose, such as miscibility.

本品与聚氯乙烯和乙烯醋酸乙烯共聚物有良好的相溶性，还和聚甲基丙稀酸甲酯、聚乙烯醇缩丁醛、硝基纤维素、醋酸丁酯纤维和乙基纤维素等相溶。

But compared with the calcium carbide process PVC, ethylene law a number of middle-grade PVC grades with irreplaceable advantages.

但与电石法聚氯乙烯，乙烯法的一些中高档的不可替代的优势聚氯乙烯成绩。

The results showed that calcium nitrate treatment apparently slowed down the consenescence rate, made the flesh firmness higher than the control, elevated the activities of POD, SOD and CAT, retarded the ethylene production, reduced the soluble protein content, and declined the increased speed of electrical conductivity and LOX activity.

结果表明：硝酸钙具有明显延缓甜瓜果实衰老的作用，使果肉硬度显著高于对照，并提高过氧化物酶、超氧化物歧化酶和过氧化氢酶活性，同时降低果肉乙烯释放量、可溶性蛋白含量、外渗电导率的升高速度和脂氧合酶活性的作用。

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。