查询词典 isoprene

Isoprene and toluene and its homologs are focused to illustrate the photooxidation of alkene and aromatic compounds.

最后，对二次有机气溶胶形成机制研究的发展方向进行了展望。

In this article, Fe3-Al3 was first used to catalyze copolymerization of maleic anhydride and isoprene.

研究了双金属体系Fe3-Al3催化马来酸酐与异戊二烯的共聚反应。

First stage, we will bulid 30,000 t/y isoprene rubber industrialisation manufature equipment antecedency by one year, to establish basis for mass production construction and cultivating market, whereas there is no isoprene rubber industrialisation manufature in our country

第一阶段，鉴于国内尚无异戊橡胶工业化生产装置，因此，首先用一年的时间先行建成3万吨/年异戊橡胶工业化生产装置，为大规模生产建设和培育市场奠定基础。

"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 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。

Typically around a quarter of each tyre is made from isoprene derived from petrochemicals, and about 60% of worldwide isoprene production is used by tyremakers.

通常一个轮胎中所含的来自石油化工产品的异戊二烯约为25%，全世界近60%的异戊二烯产品都供给轮胎制造商。

MACR and MVK continued to react with ozone to form MG and other products and disappeared finally under the experimental conditions, so their yields relative to isoprene conversion were variable along the reaction time, with the maximum yields observed as 0.33±0.02 for MACR and 0.21±0.02 for MVK respectively. MG, HCHO, HCOOH, CO and CO2 are inactive to ozone, and their final yields relative to isoprene conversion were 0.48±0.03, 0.87±0.03, 0.49±0.03, 0.60±0.03 and 0.65±0.10, respectively.

由於MACR和MVK继续与O3反应直至完全，它们的产率随时间而变化，反应过程中观测到的最大产率分别为0.33±0.02和0.21±0.02；而MG，HCHO，HCOOH，CO和CO2不与O3发生反应，最终产率分别为0.48±0.03，0.87±0.03，0.49±0.03，0.60±0.03和0.65±0.10。

Populus alba × berolinensis, Salix babylonica and Quercus mongolica mainly emitted isoprene; Pinus tabulaeformis mainly emitted α-pinene; Ulmus pumila, Gleditsia japonica and Syringa oblate mainly emitted limonene; Ligustrum obtusifolium mainly emitted isoprene, limonene and α-pinene at different time. The highest emission rates were observed for Populus alba × berolinensis and Salix babylonica.

不同树种排放的BVOCs组成明显不同，银中杨、垂柳和蒙古栎以排放异戊二烯为主；油松主要释放α－蒎烯；榆树、皂角和丁香以释放柠檬烯为主；水腊在不同时段其BVOCs组成情况变化较大，主要释放异戊二烯、柠檬烯和α－蒎烯；其中银中杨和垂柳的BVOCs释放量明显高于其它树种。

Myrcene, unreacted isoprene and solvent were separated form reactant by conventional distillations, the contents of recovered isoprene, solvent and...

回收的溶剂和异戊二烯可以再利用，月桂烯的总收率大于 4 0 %，异戊二烯直接二聚合成月桂烯工艺简单，便于放大

The selective linear dimerization of isoprene to formate myrcene in a single phase catalyst solution prepared by mixing two metals, amine, solvent and a small content of isoprene was studied.

摘 要：研究了异戊二烯在两种金属催化作用下均相线性二聚生成月桂烯的影响因素，得到优惠工艺条件：反应温度 13℃，催化剂∶异戊二烯=0 。0 5∶1 0 ，胺∶异戊二烯=0 。0 7∶1.0。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。