查询词典 cyclopentadiene

Moreover, the molecular weight of polyethely and its distribution or even the physical properties could be adjusted by changing the non-cyclopentadiene ligand; and bi-or single modal polyethylene could be realized in one system according to the different preparation methods and conditions of CpTiCl.

由于非茂配体的可选择范围很广，通过改变半茂钛配合物中的非茂配体，可以调节半茂体系聚合产物的分子量及分子量分布，乃至聚合物的物理性能；还可以根据制备方法和反应条件的不同，实现同一体系内获得双峰或单峰分子量分布聚合物的目的。

Based on the experimental results,di-butyl-peroxide,di-cyclopentadiene and propyl nitrate are found to be sensitive to the change of heating temperature and heating time,and their thermal decomposed products can be detected easily.

实验表明，在343～473 K温度范围内，过氧化二叔丁基、双环戊二烯和硝酸丙酯对受热温度和受热时间的变化较为敏感，热分解现象明显，热分解产物易于检测。

The Greek believed in the diamond collects the flame, represents theeternal 爱火, since long-time, has by the cyclopentadiene diamond tois firmly hard, radiant fresh splendor special characteristic,therefore becomes the love symbol which in today world most receiveswelcome.

希腊人相信钻石内敛的火焰，代表永恒的爱火，长久以来，由茂钻石具有至坚至硬，璀璨生辉的特质，因此成为今日世界上最受欢迎的爱情象征。

WARNING: Do not grasp the body of thesyringe because the heat of your hand will cause the cyclopentadiene to volatilize.

警告：不要抓住注射器的躯干，因为你的手所产生的热量会使环茂二烯挥发。

Accordingly, in the original reaction (formation of B from cyclopentadiene and benzoquinone) Diels and Alder found only one of the following six conceivable stereoisomers of B.

因此，在该原始反应中(即通过P-苯醌和过量的环戊二烯生成B)，Diels and Alder发现在他们推测的六个立体异构中，只有一个出现。

Because of the instability of the cyclopentadiene monomer, it must be used immediately after distillation in the preparation of ferrocene.

由于环茂二烯单体是不稳定的，在蒸馏后必须立即用作制备二茂铁。

Di-cyclopentadiene deserves to be mentioned for its simple decomposed product,cyclopentadiene,and its low-price.

尤其是双环戊二烯的分解产物单纯，仅有解聚后的环戊二烯一种，且价廉、易得，值得重视。

Third, quality assurance advantage of the present-Cyclopentadiene most dependent on imports, high prices, limited number of domestic manufacturers of quality products extremely unstable, and cyclopentadiene in the country is already mature product, the source wide quality Reliable.

甲基环戊二烯目前大部分依赖于进口，价格高、数量有限，国内生产厂家的产品质量极不稳定，而环戊二烯在国内已是成熟产品，来源广、质量可靠。

The studies on production of pure cyclopentadiene by depolymerization-rectify of technical dicyclopentadiene and the influenceable factors about preparation of cyclopentene by liquid hydrogenation of cyclopentadiene at the Raney Nickel catalyst were carried out.

介绍了以工业级双环戊二烯为原料，经过解聚-精馏得到高纯度的环戊二烯，以骨架镍为催化剂，对环戊二烯液相加氢制备环戊烯的影响因素进行了研究。

The major products were methane, ethylene, propylene, butylene, butadiene, cyclopentadiene, benzene, toluene, styrene, vinyl-substituted cyclopentene derivatives and C5/C6 isomers (pentadiene, methyl-substituted cyclopentene derivatives, cyclohexene, hexadiene and methyl-substituted cyclopentadiene derivatives), and the main primary products were determined to be C1～C4 compounds, cyclopentadiene, benzene, toluene and vinyl-substituted cyclopentene derivatives.

热裂解主要产物为甲烷、乙烯、丙烯、丁烯、丁二烯、环戊二烯、苯、甲苯、苯乙烯、环戊烯的乙烯基取代物及C5， C6异构体(戊二烯、环戊烯的甲基取代物、环己烯、己二烯和环戊二烯甲基取代物)，其中， C1～C4、环戊二烯、苯、甲苯、乙烯基取代环戊烯为初始产物。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。