查询词典 coupling coefficient

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。

At an early stage in the evolution of the high-speed diesel a variable timing device was introduced in the pump drive coupling, taking the form of a helically splined coupling by means of which the angular relation between driving and driven shafts could be varied by manual or automatic control.

在高速柴油机发展的早期，可变的正时装置被引用到油泵驱动联轴节上，采用螺旋式花键套管的形状，驱动轴和从动轴之间的相对角度可以通过手动或自动控制进行改变。

Elastic coupling is commonly used in roating machinery for connecting two shafts and delivering the power, for example, the spline coupling between engine and reducer or hydrodynamometer.

弹性联轴器作为航空发动机、减速器、动力装置或者功率吸收装置之间的连接结构，在实际工作中会遭遇到因振动过大而造成事故的发生。

The means of mutual coupling between RTC and UA are described in detail. The three kinds of development modes of RTC are put forward in order to establish the mutual coupling hypercycle with UA. It is concluded that establishing the Regional Mass Transit Corridor, which has the route only for passenger mass transport, is the future development strategy of RPTC in UA.

然后借鉴国外的先进经验和研究成果，针对我国城市群和区域客运走廊的发展现状及发展趋势，在区域运输走廊发展内外机制的指导下，提出了我国区域客运走廊未来的发展策略：形成以环保的公共交通方式为主，有专用客运线路的区域客运走廊。

Pitting corrosion takes place on ferrite when coupling it with hypoeutectoid or matensite, and on martensite when coupling it with hypoeutectoid.

以上研究结果为寻找抑制铁基合金点蚀的途径提供了理论根据，也有助于其他合金点蚀机理的认识。

By simulating the EPR parameter D and the optical spectra, the distorted angles of two inequivalent sites which formed by Cr3+ replacing M3+ are determined and the obvious differences of the distorted angles calculated by using two spin orbit coupling parameter model and single spin orbit coupling parameter model are found.

通过模拟光谱和EPR谱确定了Cr3+取代 M3+形成的两种占位结构的畸变角，发现用双自旋轨道耦合系数模型与单自旋轨道耦合系数模型计算出的畸变角存在较大的差异。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。