二聚的

The catalytic activity of this new resin catalyst in the isobutene oligomerization was measured in detail, it exhibited good catalytic activity and excellent isobutene dimerization selectivity.

在异丁烯的低聚反应中，对这种新型树脂催化剂的催化活性进行了细致的研究，磺化聚醚碸酮树脂催化剂在反应中表现出了很好的催化活性和优良的二聚选择性。

Result showed that conversion of isobutylene reached 80% and selectivity of diisobutylene was 90% when reacted at 180 oC with mass airspeed of 3h-1 by self-made R2 catalyst.

利用分子筛催化异丁烯合成二聚异丁烯，在固定床反应器中考查了温度、空速对异丁烯齐聚反应的影响。

Company is located in Longgang, Shenzhen, is the country's largest fatty acid and 2-acid, one of polyamide resin manufacturing enterprises.

公司位于深圳龙岗，是全国最大的脂肪酸及二聚酸、聚酰胺树脂生产企业之一。

Vibration analysis show that dimer and trimer have typical red-shift hydrogen bond.

振动分析表明二聚体和三聚体存在典型的红移氢键。

In addition, thermal stability indicates that the formation of dimer and trimer at 298.15K and standard pressure is a exothermic process.

热力学分析显示，298.15 K和标准压力下，二聚体和三聚体的形成是一个放热过程。

Three stable structures of the dimer and trimer have been obtained by the optimized geometries and frequencies calculation.

构型优化和频率计算得到3个稳定的二聚体和三聚体氢键异构体。

D. of the catalyst increased, i. e. the acid volume of the catalyst increased, the conversion for isobutene and the selectivity for trimer increased also, while the selectivity for dimer decreased, and the selectivity for tetramer was almost unchanged.

D。增加时，即催化剂的酸量增加时，异丁烯的转化率和三聚物的选择性也增加，但二聚物的选择性降低，四聚物的选择性则几乎没有变化。

The amplified fragment was inserted into pRSET-A to generate the first double repeat of the precursor gene. By utilizing a pair of isocaudamer BamH I and Bgl II sites, and another downstream Hind III site of plasmid pRSET-A, following a series of simple double digestions and ligation of the resulted products, a series of repeat (3, 4 and 6) precursor peptide fragment genes were derived.

本实验设计一对两侧含编码疏水性氨基酸密码子的引物，经过扩增前导序列10~34aa基因序列，并重新克隆入质粒pRSET-A构建串联二聚体后，再利用质粒pRSET-A的BamH I / Bgl II同尾酶克隆位点，经一系列简单的酶切和连接，快速构建这一前导肽中不含组氨酸标签序列的串联多聚体基因，并成功表达其六聚体重组蛋白。

The dimerization is thermodynamically unfavorable by the enthalpy. However, the formations of trimers and tetramers are very favorable thermodynamically even at high (1200 K) temperatures. Comparisons of the thermodynamic parameters of subsequent oligomerization are also given.

由焓变可知，单体形成二聚体在热力学上是不利的，而形成三聚体和四聚体在高达1200 K的温度下是有利的，同时分析比较了后续反应的热力学参数。

This dissertation is concerned with the approaches to a new high density liquid fuel , tetrahydrotricyclopentadiene, which can be synthesized with dicyclopentadiene as raw materials by three steps: Diels-Alder reaction, separation and hydrogenation.

本文以双环戊二烯为原料，通过双烯加成、分离、加氢反应得到目的产物——新型高密度液体燃料四氢三环戊二烯，主要研究内容包括： 1。三环戊二烯的合成采用两种方式对TCPD的合成进行了研究：DCPD直接热聚法、DCPD与环戊二烯双烯加成法。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。