查询词典 coupling

Pd(PPh3)4 is more reactive for boronic acids with steric hindered F atom and no self-coupling by-product, and coupling reactions gave good yields of 90% and 91%.

Pd(PPh3)4对于含有位阻F原子苯硼酸的偶联反应很具有活性，且没有自偶联产生，产率可达90%及91%。

Pd(PPh3)4 was more reactive for boronic acids with sterically hindering F atom, and the coupling reactions gave good yields of 90% and 91% without any self-coupling by-product.

Pd(PPh3)4对于含有位阻F原子苯硼酸的偶联反应很具有活性，且没有自偶联产生，产率可达90%及91%。

By focusing on the coupling of water and fertilizer and using all-purpose regression design with four factors and five levels, and based on pot experiments and quantitative analysis, the coupling effect of water and fertilizer on Casuarina equsetifolia biomass was studied in order to solve the inconsistency problem of water and fertilizer supply on coastal sandy land.

针对滨海沙地因水肥不协调而形成大面积低效林分的问题，以水肥耦合为中心，以1年生木麻黄幼苗为研究对象，采用四因子五水平二次通用旋转组合设计，利用盆栽试验和定量分析的方法，研究探讨了在不同水肥条件下，水、N、P、K四因子对木麻黄生物量的影响。

This paper analyses the coupling wastage in columniform wave guide gas laser,and gives the function between the coupling wastage of laser guide modulo EH11 and the position and radius of reflector.

分析了圆柱形波导气体激光器中的耦合损耗，给出了最低阶波导模EH11的耦合损耗与反射镜位置、曲率半径的函数关系。研究表明：反射镜的位置和半径存在着最佳值，在取得最佳值时，可得到最低的耦合损耗

A fluid-solid coupling simulation must be made when people do an experimental research on similar materials in a mining area coved with water, but it has been not succeeded because people have not found the long-term suitable coupling materials.

水下煤矿开采在进行相似材料实验研究时都应进行固液两相模拟，但由于对两相实验材料的研究一直未取得突破性进展而未成功。

The use of carbon monoxide from coal or natural gas to produce dialkyl oxalate is an important research area in C1 chemical technology. The chemical reactions and performance in the coupling reaction system for synthesis of diethyl oxalate from carbon monoxide and ethyl nitrite were tested in the presence of hydrogen under the typical coupling reaction conditions.

摘 要：实验研究了在氢气存在下，一氧化碳与亚硝酸乙酯偶联合成草酸二乙酯反应体系在典型操作条件下的化学反应和反应性能，结果表明氢气只与反应体系中的亚硝酸乙酯反应生成乙醇。

On the other hand, a method for the synthesis of-vinyl chalcogenides by the coupling of vinyl bromides with thiols or diphenyl diselenide using copper salts as catalysts in ionic liquids based on amino acids also has been described. The ionic liquids play multiple roles in the reaction: they act as solvent, base, and excellent promoter for the copper-catalyzed coupling reactions.

在新型的氨基酸负离子的离子液体中，开发了一个亚铜盐催化的Z-型溴代烯烃与硫族元素的交叉偶联反应，为立体选择性的制备Z-型烯基硫醚或烯基硒醚类化合物提供了一个新的方法；在此反应体系中，离子液体不仅起到了反应溶剂的作用，而且还起到了金属催化剂的配体和中和反应副产物的碱的作用。

An epicyclic unit was also fitted between the coupling and rear differential to amplify speed differences between coupling input and output.

一个单位也是行星之间的耦合装置和后部之间的差距继续扩大耦合输入和输出速度的差异。

With a model of chronically compressed dorsal root ganglion, the present study was undertaken to test how the plasticity of sympathetic sensory coupling is and whether the coupling is mediated by intracellular messenger PKA by analysing extracellularly recorded spontaneous activity of single A fibers originating from the CCD neurons in vitro.

本实验在背根节慢性压迫模型上，采用离体灌流DRG和单纤维记录神经元自发放电的方法研究了初级感觉神经元的交感感觉耦联作用及其细胞内机制。

Based on the above rules of the coupling relation between eco-environment and geotectonics, the coupling relation between the en

通过对陕西生态环境脆弱度的评价以及有关的分析得出，构造决定的生态环境整体功能衰退是形成脆弱中心和造成区域生态环境问题的根本因素。

Looking to bounce back from defeat against Cesena last weekend, the Calabrian boss will be sticking to his tried and tested 4-3-3, with Lopez and Sedivic joined up front in Giampaolo's absence by either Nanni or Plasmati.

鉴于上周末对切塞纳的比赛中反败为胜，这支南方球队将会更坚持其一贯而有效的4-3-3阵型，洛佩斯和塞德维奇将取代受伤缺席的詹保罗，和纳尼或者帕斯马蒂中的一个搭档锋线。

Meanwhile, their exposure to the more freewheeling ways of the West broadened dramatically.

另外，西方较自由的生活方式对年轻人的影响增大。