查询词典 metathesis

A desire to elucidate this reaction, and the analogous alkyne metathesis reaction, led to the discovery and development of high oxidation state complexes that contain a M=C or M C bond, so-called alkylidene and alkylidyne complexes, respectively.

为了阐述复分解反应，发现和发展了含有双键和三键的金属有机化合物，分别被称谓杂金属烯烃和杂金属炔烃。

First we found some limitation lying in the chemical metathesis, especially in the controlling of the quality of the product and the velocity of the reaction. In the following research, we did some comparison experiment of synthesizing various nickel boride nanocrystal in the same principle, but by the two methods respectively.

另外，在试验过程中，我们逐渐发现了化学交换法的局限性，尤其在对反应进程和反应产物质量的控制方面的缺陷，并进一步通过分别用两种方法合成纳米硼化镍颗粒，合成原理相同，但反应产物相应发生较大变化。

The key of theme cast about for the more effective catalysts of metathesis reaction.

提高交互置换反应单程转化率的关键是寻找性能优良的催化剂。

In addition, we studied the ring-closing metathesis of the diene intermediates to access helicenes by screening a wild reaction condition.

我们还对RCM反应关环得到螺旋化合物的方法进行了研究，筛选得到温和的RCM反应条件。

It seems that intricate steric or electronic demand is required for an intramolecular metathesis to take place.

会产生这样的结果主要推测与立体效应和电子效应有关，进而产生分子内的歧化反应。

The industrial manufacturing technique, the trend of development of neohexene ,and the characteristics of these production technique were reviewed and analyzed in the paper, particularlyabout the selective dimerization of isobutylene and metathesis of βdiisobutylene with ethylene were introduced.

对新己烯生产技术的现状和今后的发展趋势进行了综述，分析了由异丁烯和乙烯生产新己烯的技术特征，讨论了烯烃二聚工艺和催化剂、烯烃复分解工艺及相应的催化剂，指出了各种工艺的优势和不足。

The development of a theory is equal to a conscious representation under a conditionof the context metathesis.

理论的创新发展问题就是语境置换条件下理论的自觉呈现问题。

Sound change as a result of sound movement is known as metathesis _.

语音位移作为语音变化的结果，一般称为语音变位。

In this work, we focus our effort on the studying of the sol-thermal and chemical metathesis synthesis of nanomaterials powder.

本论文针对无机纳米粉体的两种合成方法，溶剂热合成和化学交换法，对纳米粉体合成技术进行了探索。

This approach avoided the long duration at high temperatures in traditional methods and unstable precursors in metathesis reactions.

这种合成方法不需要单质反应的高温及长时间处理，也避免金属氯化物与碱金属硫化物或硒化物之间的交换反应中不稳定的前驱物。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。