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Chen, Yujie,Zhao, Zhongzhen,Chen, Hubiao,Brand, Eric,Yi, Tao,Qin, Minjian,Liang, Zhitao The Korean Society of Ginseng 2017 Journal of Ginseng Research Vol.41 No.1
Background: Asian ginseng and American ginseng are functional foods that share a close genetic relationship and are well-known worldwide. This article aims to investigate the correlation between morphological characteristics and the inherent quality of Asian and American ginsengs. Methods: In this study, an ultra-HPLC-quadrupole/time-of-flight MS (UHPLC-Q/TOF-MS) method was established for the quantitative analysis of 45 ginseng samples. The method developed for determination was precise and accurate. Results: The results showed that Asian ginseng samples with the same growing time (with the same or similar number of stem scars) that had a thinner main root, a longer rhizome and more branch roots contained greater amounts of ginsenosides. For American ginseng, two tendencies were observed in the relationship between the diameter of the main root and contents of ginsenosides. One tendency was that samples with thinner main roots tended to contain higher levels of ginsenosides, which was observed in the samples sold under the commercial name pao-shen. Another tendency was that samples with thicker main roots contained higher contents of ginsenosides, which was observed in the samples sold under the commercial name pao-mian, as well as in samples of American ginseng cultivated in Jilin, China. Conclusion: An approach using ultra-HPLC-quadrupole/time-of-flight MS was successfully established to link morphology and active components for evaluating the quality of Asian and American ginsengs. Clear correlation between visible morphological features and quality of Asian and American ginsengs was found. People can see the difference; this means consumers and vendors can evaluate ginseng by themselves.
Liu Qianshi,Xu Guoning,Li Zhaojie,Jia Zhongzhen,Gao Yang,Li Yongxiang,Yang Yanchu 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
With the improvement of system integration and complexity, reliability has become an important quality index of near-space vehicles. The non-regulated bus structure cannot meet the requirements for the bus voltage of near-space vehicles in the daytime although it has a high reliability in traditional method of reliability identification. Furthermore, the power density of the fully-regulated bus structure is relatively low while it decreases the reliability of the system. Therefore, the semi-regulated bus structure is more suitable for near-space vehicles. In order to improve the reliability of the energy system, a three-port converter is proposed here according to the working mode and functional requirements of near-space vehicles. The converter can realize highly reliable energy management of the energy system. An approach for systematic full state mission effect reliability modeling and evaluation is proposed. The indices can quantify the functional reliability of the system. A prototype machine with high frequency, high power density and high integration is developed. The proposed structure can improve far more reliability than parallel structure did. The reliability analysis results show that the proposed structure has higher reliability than traditional structures and the similar type structures. It comes to a more accurate conclusion contrary to traditional methods when systematic full state mission effect reliability is considered. The calculation method has higher accuracy than traditional method which evaluated the reliability of different converters working on near-space vehicles.