In this paper, results are presented on first application of laser-induced breakdown spectroscopy （LIBS） technique for quantitative determination of Mg concentration in alpha-olefins. It is demonstrated that this te...In this paper, results are presented on first application of laser-induced breakdown spectroscopy （LIBS） technique for quantitative determination of Mg concentration in alpha-olefins. It is demonstrated that this technique gives accuracies in Mg concentrations which are comparable with those of traditional methods, as ICP-OES, in short times and without need for sample preparation. Limits of detection for Mg of the order of 500 ppb are demonstrated. Moreover, a brief discussion about the realization of orooer calibration curves and the definition of the limit of detection （LOD） is reoorted.展开更多
An expert system for the elucidation of the structures of organic compounds--ESESOC-IIhas been designed. It is composed of three parts: spectroscopic data analysis, structure generator, and evaluation of the candidate...An expert system for the elucidation of the structures of organic compounds--ESESOC-IIhas been designed. It is composed of three parts: spectroscopic data analysis, structure generator, and evaluation of the candidate structures. The heart of ESESOC is the structure generator, as an integral part, which accepts the specific types of information, e.g. molecular formulae, substructure constraints, and produces an exhaustive and irredundant list of candidate structures. The scheme for the structural generation is given, in which the depth-first search strategy is used to fill the bonding adjacency matrix (BAM) and a new method is introduced to remove the duplicates.展开更多
Rare earth compounds would come into the biological systems because of their wide uses. Therefore, it is very important to study their biological effects. The interactions between rare earth ions and the cells have be...Rare earth compounds would come into the biological systems because of their wide uses. Therefore, it is very important to study their biological effects. The interactions between rare earth ions and the cells have been studied intensively, and reported here are our <sup>133</sup>Cs NMR results about the effects of La<sup>3+</sup> upon C<sub>s</sub><sup>+</sup> uptake by human erythrocytes.展开更多
文摘In this paper, results are presented on first application of laser-induced breakdown spectroscopy （LIBS） technique for quantitative determination of Mg concentration in alpha-olefins. It is demonstrated that this technique gives accuracies in Mg concentrations which are comparable with those of traditional methods, as ICP-OES, in short times and without need for sample preparation. Limits of detection for Mg of the order of 500 ppb are demonstrated. Moreover, a brief discussion about the realization of orooer calibration curves and the definition of the limit of detection （LOD） is reoorted.
基金Project supported by the Naional Natural Science Foundaion of China.
文摘An expert system for the elucidation of the structures of organic compounds--ESESOC-IIhas been designed. It is composed of three parts: spectroscopic data analysis, structure generator, and evaluation of the candidate structures. The heart of ESESOC is the structure generator, as an integral part, which accepts the specific types of information, e.g. molecular formulae, substructure constraints, and produces an exhaustive and irredundant list of candidate structures. The scheme for the structural generation is given, in which the depth-first search strategy is used to fill the bonding adjacency matrix (BAM) and a new method is introduced to remove the duplicates.
基金Project supported by the National Climb Program, Foundation of Rare Earth Science, the National Natural Science Foundation of Chinathe Science Foundation of the Applied Spectroscopy Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy
文摘Rare earth compounds would come into the biological systems because of their wide uses. Therefore, it is very important to study their biological effects. The interactions between rare earth ions and the cells have been studied intensively, and reported here are our <sup>133</sup>Cs NMR results about the effects of La<sup>3+</sup> upon C<sub>s</sub><sup>+</sup> uptake by human erythrocytes.
