查询词典 scission

In the process of reaction, the degradation of the polymer follows a random chain scission mechanism. Every part of the molecular chain has an equal reactive probability.

反应过程中PHB 分子链各处具有相同的反应几率，分子链无规断裂。

This result was consistent with the previous simulation study;(2) the signals of MAH onto the radical chain ends with double bonds increased markedly with increasing MAH content, indicating that P scission occurred after MAH attached to the tertiary carbons.

MAH的用量对接枝PP链的等规度有很大的影响，主要表现在随MAH浓度增加，PP链的mm序列所占的比例逐渐增大，mr和rr序列所占的比例逐渐减小。

We believe that in CO hydrogenation reaction, the scission of C-O bond is via the carbonyl hydride-multihydrogen carbonyl hydride.

与CO加氢反应和CO歧化的吸附态研究结果相关联，作者认为Rh+Co/Al2O3上CO加氢生成CH4是经由羰基氢化物-多氢羰基氢化物途径。

Further annealing at 600K, bond scission in the Si-H moiety results in the desorption of hydrogen and finally leads to the formation of the copper silicide.

我们的理论分析表明，硅原子替代了表面第一层的部分铜原子，这些硅原子和剩下的铜原子组成一层新的复合层，形成R30°结构。

The modified surface with a high friction coefficient becomes hydrophilic.The main reason is that: there is a basic photoreaction of oxygen under UV radiation,in which atomic oxygen may highly be generated.Then the oxygen atom reacts with trace amounts of water to form hydroxyl.

其机理为：在紫外照射条件下氧气发生光化学反应形成氧原子，氧原子和微量的水发生反应形成羟基，羟基和烃发生夺氢反应形成硅烷的烃自由基，同时硅烷的烃自由基会发生β-scission裂解形成较短链的自由基。

Fig.6.Schematic of the formation of cyclopentanone from the polyester-polyol via primary scission of the ester bond, followed by hydrogen transfer with formation of cyclic chain ends which eliminate cyclopentanone and carbon dioxide

从表2中可以看出，低温、氮气条件下，PU-1分解主要可辨别的组分为1，4丁二醇，（Fig.5a）中m/z71不能够辨别，（Fig.5b）显示了m/z71离子谱图，这些峰一定是聚合物多元醇热降解产生的低聚物。

The chain scission occurs at the position with respect to double bonds, forming the main products including dipentene, styrene and vinyicyclohexene.

二聚体形成途径主要有两种：（1）主链自由基进行分子内转移，&反咬&实现环化，生成二聚体；（2）单体通过双分子合成反应生成二聚体。

Excitation functions of neutron, proton and α particle emission prior to scission measured in the reactions 28 Si+ 164,167,170 Er→ 192,195,198 Pb are studied using an extensive fission diffusion model and it is found that the model can well describe the trend of particle multiplicities of Pb isotopes measured experimentally as a function of the bombarding energy,which indicates the existence of isotope effects in prescission particle emission.

用推广的裂变扩散模型研究了2 8Si+16 4，16 7，170 Er→192 ，195，198Pb反应中测量的断前中子、质子和α粒子多重性的激发函数。发现扩散模型能很好地拟合这些轻粒子多重性随裂变系统激发能和Pb同位素的变化趋势。表明断前粒子发射存在一个同位素效应。进而在一个考虑了裂变过程中摩擦效应的统计模型的框架内，在In和Er这两个元素的同位素链中，考察了同位素效应与裂变碎片质量不对称性和裂变系统尺度的关系。计算结果表明：同位素效应的存在不依赖于裂变系统的大小和不对称性。此外，当裂变系统具有高的中质比时，轻带电粒子发射将不再敏感于裂变延迟时间的长短，而中子发射则非常敏感。

The results show that the thermal degradation process of polystyrene initiates from chain end scission, and styrene dimer is the residual of degradation of polystyrene; Different catalysts have different catalytic activity on the degradation process of polystyrene, among which barium oxide is the best.

作者利用热重质谱法对聚苯乙烯热降解和催化降解过程进行了研究，得出以下结论，聚苯乙烯的热降解过程主要由链端断链反应引发，苯乙烯二聚体可能是聚苯乙烯降解结束阶段的剩余物；不同催化剂在聚苯乙烯降解过程中具有不同的催化活性，其中氧化钡的催化活性最高。

Between 4-9L exposures, C2H4 has a desorption channel at 155-180K. C2H4 desorption at 130K maybe results from BrCH2CH2Br absorbs in Br atom toward surfaces, after C-Br bond scission, because C2H4 has no opportunity to touch surfaces so it desorbs at low temperature. C2H4 desorption at 210K is likely to be desorption limited that, BrCH2CH2Br docomposes to C2H4, only to desorb at higher temperature. This C2H4 desorption channel maybe comes from defect site desorption.

曝露量在4-9L之间，C2H4在155至180K的范围内也有脱附的管道。130K的C2H4脱附可能是因为BrCH2CH2Br分子以Br原子朝向表面的方式吸附，在断了C-Br键后，C2H4分子没有机会接触到表面在低温就脱附了。210K的C2H4可能是脱附所决定的，亦即BrCH2CH2Br分解后在表面形成C2H4，随后温度升高至较高温才从表面脱附，此C2H4管道也许是来自缺陷位置上的脱附。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。