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Li Jing,Peng Shidong,Yi Chenxi,Huang Hao,Cao Yundong,Liu Shuxin,Zhou Zhu 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.5
Urban rail transit in high-altitude areas is developing gradually, but the failure of short circuit breaking of on-board largecapacity DC air circuit breaker (LC-DCCB) at 2–4 km altitudes has become severe and common. To interrupt short circuit current at 2–4 km altitudes of on-board LC-DCCB successfully, multi-physical coupling simulation of short circuit breaking of LC-DCCB at 2–4 km altitudes was conducted in this research based on the magneto-hydro-dynamics (MHD) model, and the simulation results were compared with those at 0 km altitude. The two-dimensional (2-D) transient distribution of physical parameters such as temperature, airfl ow, and electromagnetic fi elds in the arc chamber were obtained. The results indicate that the fundamental reasons for the failure of LC-DCCB to interrupt short circuit current arc at high altitudes are the arc root stagnation and arc reverse movement between splitter plates. Based on the simulation results, the arc chamber structure was optimized by setting U-shaped splitter plates to improve the interruption performance of LC-DCCB at high altitudes. Compared with the previous structure, the improved structure with three intercalary U-shaped splitter plates on both sides of the center line of the arc chamber has the best arc extinguishing performance at high altitudes, which can interrupt 18 kA short circuit current successfully at 3 km altitude, with an arc duration of 19.5 ms. This research reveals the fundamental cause for the diffi culty in interrupting short circuit current arc in LC-DCCB at high altitudes, which can provide theoretical and technical guidance for the research and design of such a product.
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Guohu Chen,Xinyu Ye,Fanli Zeng,Jian Wang,Lingyun Yuan,Shidong Zhu,Jinfeng Hou,Yuan Cheng,Chenggang Wang 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.3
The novel male sterility line 12-14A of Wucai ( Brassica campestris ) was generated by backcrossing. In this study, morphological,molecular, and cytological analyses were performed to characterize this line. The phenotypes of fl ower organsof 12-14A were diff erent from those of its maintainer line 12-14B, as the fl owers of 12-14A were completely infertile. Molecular analysis confi rmed that the male sterility line 12-14A was classifi ed as the ogu CMS type. An analysis of antherdevelopment in the CMS line demonstrated that two types of abortion occur simultaneously: pollen mother cell abortionand tetrad-to-mononuclear microspore abortion. In addition, the mature anthers of 12-14A showed typical abortive features,such as appearing dry, shrunken, and scaly. A heterosis test of hybrids from CMS 12-14A and four inbred lines was carriedout, and the F 1 hybrids exhibited clear heterosis in plant weight, as well as in the protein, soluble sugar, and vitamin C content,suggesting high yields and high quality potential. These results indicate that this novel CMS line may have powerfulpotential in Wucai hybrid breeding.
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