查询词典 dienes

Catalytic cracking ; gasoline stock ; dienes ; selective hydrogenation ; nickel ; catalyst ; potassium ; cocatalyst

催化裂化；汽油料；二烯烃；选择加氢；镍；催化剂；钾；助催化剂

The Chemical method is based on the Diels-Alder reaction of conjugated dienes with maleic anhydride and the chromatographic analysis use a packed column with SE-30 as stationary phase.

建立了用共轭二烯烃与马来酸酐Diels-Alder特性反应和非极性固定液SE-30填充柱1m×1。

The effect of aluminum ions on the Fe2+-initiated lipid peroxidation in liposomes was studied by chemiluminescence, TBARS, conjugate dienes assays and ESR spectroscopy.

利用化学发光、TBA 反应与测量共轭二烯的方法观测了Al3＋对Fe2＋启动的卵磷脂脂质体脂质过氧化的影响。

The lipid oxidation of the muscles of breast and leg in dry-cured duck during processing was studied by determination of the peroxide value,TBARS value,carbonyl compounds and conjugated dienes.

通过对过氧化值、硫代巴比妥酸值、羰基值和双烯值等氧化指标的测定，研究南京板鸭加工过程中各工艺点板鸭肌肉脂肪的氧化变化。

The C2 to C5 and heavier acetylenes and dienes in a thermally cracked feed stream are hydrogenated without significantly hydrogenating the C2 and C3 olefins.

使经过热裂解的进料物流中的C2－C5及更重的炔烃和二烯烃加氢，而不使C2和C3烯烃发生显著的加氢。

The more the types of unstable constituents,such as unsaturated hydrocarbons,especially conjugated dienes,arene s and so on,and the higher the unstable constituent contents in diesel fuel,the more easily the oxygen absorption reaction takes place.

柴油中含有某些不饱和烃，特别是共轭二烯烃、环烷、芳香烃类等不安定组分的种类越多及含量越高，就越容易发生吸氧氧化反应，安定性能或质量下降越明显。

This makes Ni-W-P powder more suitable for partial hydrogenation of dienes. The kinetic results suggest there are some different between the active sites of Ni-P and Ni-W-P powder. DSC, XRD and EXAFS results suggest that the tungsten codeposition makes Ni-W-P powder more amorphous than Ni-P powder.

动力学结果表明在两种合金微粒上，不仅环戊二烯与环戊烯的相对配位能力不同，而且它们各自的反应速率常数也不一样，表明非晶态Ni-P、Ni-W-P合金微粒的催化活性中心存在着一定的差异。

Phytochemical investigation on the acetone extract of the stems of K.oblongifolia led to the isolation of 49 compounds and 31 of them were identified.They were 20 lignans,(including 11 dibenzocyclooctadienes,8 spirobenzofuranoid dibenzocycloocta -dienes,1 other lignan),9 flavones,and 1 nortriterpenoid.Among them,4 were new compounds,1 was new natural products,and 8 compounds were isolated from this family for the first time.

通过对冷饭藤的藤茎化学成分的研究，从丙酮提取物中分离得到49个化合物，鉴定了31个化合物，包括木脂素类化合物20个(联苯环辛烯类木脂素11个，螺苯骈联苯环辛烯类木脂素8个，其他类型木脂素1个)，黄酮类化合物9个，降三萜类化合物1个，其中。4个为新化合物，1个新的天然产物，8个为本科首次报道。

In order to decrease copolymerization loss of isoprene during thermal dimerization of cyclopentadiene in C5-fraction,the effect of three inhibitors,diethylhydroxylamine,p-tert-butylcatechol and o-nitrophenol,on dienes' polymerization in the process was investigated by experiment with sealed glasstube.

为减少C5馏分环戊二烯热二聚过程中异戊二烯的聚合损失，采用封管实验方法考察了添加阻聚剂二乙基羟胺、对叔丁基邻苯二酚、邻硝基苯酚对热二聚过程中各二烯烃组分聚合程度的影响。

For examples as an additive for lithiumion batteries,as a component of surface coatings or as a monomer for the preparation of polyvinylene carbonate,and the Diels-Alder reaction was carried out successfully between vinylene carbonateand many dienes.

碳酸亚乙烯酯作为聚合物单体可在自由基引发作用下形成较高分子量的聚碳酸亚乙烯酯，另外VC可以和许多二烯类化合物发生反应，合成出许多精细化工中间体。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。