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finger print
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  finger print
A quantitative estimation of metabolites showed a strain specific (Finger print) metabolite profile which can be used for strain/species identification/differentiation.
      
In addition, it was observed that the element pattern of textile samples resembled 'finger print type', TXRF-spectra.
      
In addition, there are vermicular, 'finger print' intergrowths of nepheline with potassium feldspar, and patchy to micrographic intergrowths of kalsilite with potassium feldspar.
      
All of these detail leaf features show specific specificity of leave finger print for 6 rhododendrons.
      
Finger print analysis of bacterial 16S RNA (molecular phylogeny) has not only changed the classification of bacteria but also the approach to solving environmental problems.
      
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In this paper, the Fourier infrared spectra of N,N-dimethylformamide-(DMF ) and N,N-dimethylacetamide (DMA) and their water-containing sample have been investigated in the range 100-4000cm-1. The changes of frequencies and intensities resulted by the hydration of DMF and DMA have been observed from the substraction spectra.The bands at 1674 and 1647cm-1 are assigned to the C=O stretching vibration for the DMF and DMA, which decrease to 1651 and 1626cm-1 respectively due to the formation of hydrogen bond between...

In this paper, the Fourier infrared spectra of N,N-dimethylformamide-(DMF ) and N,N-dimethylacetamide (DMA) and their water-containing sample have been investigated in the range 100-4000cm-1. The changes of frequencies and intensities resulted by the hydration of DMF and DMA have been observed from the substraction spectra.The bands at 1674 and 1647cm-1 are assigned to the C=O stretching vibration for the DMF and DMA, which decrease to 1651 and 1626cm-1 respectively due to the formation of hydrogen bond between C=O and water upon hydration.The hydration of DMF and DMA may also be characterized by the formation of hydrogen bond with the lone electron pair of the amide nitrogen. This may be seen from the substraction spectra of water-containing DMF and DMA in the IR finger-print region and also in the far IR region. The following bands change upon hydration. 1389, 1094, 659, 404, 354 and 329cm-1 for DMF; 1397, 1188, 1014 and 591cm-1 for DMA.On the other hand, the characteristic frequencies of pure water peaks at 1646 and 3403cm-1 also change to 1690 and 3500cm-1 upon hydration with DMF, or to 1663 and 3469cm-1 upon hydration with DMA, because the electron density of the water molecule is increased as a result of receiving some electronic charge from the Lewis base.

应用光谱减法研究了二甲基甲酰胺(DMF)和二甲基乙酰胺(DMA)水化作用所引起的红外光谱变化,由于羰基和水分子形成氨键的水化作用,含水DMF和DMA的羰基伸缩振动向低波数移动,根据含水DMF和DMA中红外指纹区及远红外区某些谱带的变化,水化作用似乎也表现为酰胺基上具有孤对电子的氮原子与水分子形成氢键。DMF和DMA的水化作用使水峰向高波数移动。

Desorption chemical ionization technique has been applied by authors to direct thermal pyrolysis of polymers in chemical ionization source with different reagent gases. Several main types of polymers, namely vinyl type, condensation type and copolymerizationtype of polymers, have been investigated by this technique. The resulting DPCI spectra can be not only used as finger-prints to distinguish the different polymers, but also applied to investigate mechanism on thermal pyrolysis of polymers.

将解吸化学电离技术应用于聚合物的直接热裂解,研究乙烯型、缩聚型和共聚型聚合物。得到的谱图不仅能作为指纹谱区别不同的聚合物,而且能用于研究聚合物热裂解机理。

Having elaborated the principle of Static Secondary Ion Mass Spectro-metry (SSIMS) and compared with the function of X-ray photoelectron spectroscopy and Augerelectron spectroscopy, this paper, with [31] references, presents the applicability of SSIMS for characterization of polymer surfaces.It includes the characterization of polymer surface structure and surface reaction monitoring. The result shows either highly characteristic finger print spectra for polymers with similar structures or semiquantitat;ve...

Having elaborated the principle of Static Secondary Ion Mass Spectro-metry (SSIMS) and compared with the function of X-ray photoelectron spectroscopy and Augerelectron spectroscopy, this paper, with [31] references, presents the applicability of SSIMS for characterization of polymer surfaces.It includes the characterization of polymer surface structure and surface reaction monitoring. The result shows either highly characteristic finger print spectra for polymers with similar structures or semiquantitat;ve data of mild surface degradation catalyzed by H2SO4 and CH3COOH can be obtained. This information, which could not be detected in ESCA, comes from the depth of only several or even one atomic layers under the surface.SSIMS can achieve its highest degree of effectiveness in the trace of inorganic elements, It is. indeed possible to predict detection sensitivities, in ng/g magnitude for many elements. In model studies of heterogeneous polymer surface, the potential of SSIMS for molecular imaging was demonstrated, and the spatial resolution of pictures have reached 50 μm successfully.Also, the authors have prospected the development of SSIMS in near future.

本文综述了静态二次离子质谱(SSIMS)的工作原理;与X射线光电子能谱和俄歇电子能谱的功能比较及SSIMS在聚合物表面研究中的最新进展。 用SSIMS技术,表征聚合物表面结构和表面反应,可得到仅数个原子层厚度的表面层结构信息,包括结构相近聚合物的特征“指纹区”数据和X射线光电子能谱不能检测到的水解反应半定量数据。SSIMS可同时检测聚合物表面的多种痕量元素,分析灵敏度达毫微克/克级。用SSIMS作聚合物表面形貌观察时,图像的立体析象清晰度可达50μ。

 
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