三聚体

The IR spectra of poly isocyanate curing agent with different content of TDI trimer was measured and analyzed.

对不同TDI三聚体含量的多异氰酸酯固化剂的红外光谱进行了测定，采用偏最小二乘法对所得到的红外光谱进行分析，测定了多异氰酸酯固化剂中TDI三聚体的含量，该方法简单快速，结果可靠。

The IR spectra of polyisocyanate curing agent with different content of TDI trimer was measured and analyzed.

对不同TDI三聚体含量的多异氰酸酯固化剂的红外光谱进行了测定，采用偏最小二乘法对所得到的红外光谱进行分析，测定了多异氰酸酯固化剂中TDI三聚体的含量，该方法简单快速，结果可靠。

Our results suggested that the channel contains two of each subunit and the stoichiometry is apt to 2:2 if hetermeric ASIC channel is a tetramer,while the assembly of ASICs is random,the stoichiometry is not fixed(2:1 and 1:2 coexist)if hetermeric ASIC channel is a trimer.This study provided interesting new data supporting the occurrence of the homomeric and heteromeric assembly of ASICs.

另外，我们还对ASIC异聚体的分子比情况进行了初步的探讨，结果发现如果所形成的ASICs异聚体通道是四聚体，那么每种亚单位有两个，分子比倾向于2∶2；如果是三聚体，则提示ASICs的装配是随意的，分子比是不固定的，2∶1和1∶2这两种情况都存在。

For the production of reactive polyurethane cross-linkinger and curing agents,2,4-diisocyanate toluene terpolymer,which possesses the rigid structures of hexatomic ring and three reactive functional groups,was synthesized and characterized by the Fourier transform infrared,the gel permeation chromatography and the chemical analysis methods.

结果表明采用Cat-3作催化剂，在(60±2)℃下反应，可制得分子量为530~550，Mw/Mn=1.10，NCO质量分数为(25.0±0.5)%窄分子量分布的TDI三聚体；随着反应时间延长，TDI会进一步多元聚合生成多聚结构；而加入质量分数为0.4%的苯甲酰氯作为稳定剂，可有效抑制多元聚合的发生，所制备的TDI三聚体稳定性可在半年以上

In crystal, two APC-PY trimers associate into a hexamer by face. The assembly of two trimers within this hexamer is very similar to that of C-phycocyanin and R-phycoerythrin hexamers, but the tight level of the assembly of two trimers within this hexamer is clearly not so much as that of C-PC and R-PE hexamers.

晶体结构中，两个APC-PY的〓三聚体通过面对面的方式缔合成一个〓六聚体，该六聚体内两个三聚体的组装方式十分类似于C-藻兰和R-藻红六聚体，但六聚体内两个三聚体组装的紧密程度上显然不如C-藻兰和R-藻红六聚体。

These results reveal that the APC〓 trimers in the core cylinders of phycobilisomes favour a standard face to face manner to associate into a〓 hexamer, but probably, the APC〓 trimers cannot form a stable〓 hexamer like C-PC and R-PE hexamers due to the relatively weaker association between two trimers, but a relatively looser hexamer.

这些结果表明位于藻胆体core cylinder中的APC〓三聚体趋向于以通常的面对面的方式缔合成〓六聚体，但由于六聚体内两个三聚体之间的相对较弱的相互作用，APC三聚体很可能不能形成象C-藻兰和R-藻红一样的稳定的六聚体，而只能形成一个相对松弛的六聚体。

The results from GC-MS and GC analysis confirmed that the oligomer was a mixture consisting of di-(14%),tri-(45%),tetra-(31%) and pentamer(10%).

GC-MS和GC的分析结果表明所得齐聚物是混合物，主要由二聚体、三聚体、四聚体和五聚体组成。

The reactions involved in the co-curing are: cyclodimerization and cyclotrimerization of cyanates, polyetherfication of epoxy groups and cyclotrimerization of cyclic dimers, as well as the formation of oxazolidinone rings.

反应历程首先是氰酸酯发生自聚反应形成二聚体或三聚体，然后二聚体可进一步共聚形成三嗪环，此过程伴随着环氧基的聚醚反应，最后是三嗪环与剩余的环氧基反应形成NFDA1唑烷酮。

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。

In PEC trimers, the energy transfer paths in PEC monomers remain, but the transfer rates between the chromophores become higher due to strong couplings between pairs of the nearest neighbor chromophores 1α〓-PVB/2β〓-PCB. Meanwhile, a new energy transfer path with a time constant of about 40 ps emerges among the three β〓-PCB chromophores of C〓 symmetry in PEC trimers.

在PEC三聚体中，在相同单体中的能量传递途径仍存在，由于三聚体毗邻的1α〓-PVB/2β〓-PCB色团对之间的强耦合，使不同色素之间的能量传递速度加快；同时，在PEC三聚体中出现新的能量传递途径：3个具有C〓空间对称性的β〓-PCB之间所发生的较快速的能量传递（约40 ps）。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。