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基于文本挖掘的高校实验室事故致因识别研究
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作者 陈锐坤 杨中华 盛阳 《运筹与模糊学》 2024年第4期254-263,共10页
为有效预防和减少高校实验室事故的发生率,使用ROST CM6文本挖掘工具和UCINET社会网络分析工具,基于从各网络、媒体收集的2006~2022年间的高校实验室事故报道26份,从词频分析、共现矩阵分析、事故致因可视化处理、中心性分析四个角度切... 为有效预防和减少高校实验室事故的发生率,使用ROST CM6文本挖掘工具和UCINET社会网络分析工具,基于从各网络、媒体收集的2006~2022年间的高校实验室事故报道26份,从词频分析、共现矩阵分析、事故致因可视化处理、中心性分析四个角度切入,探索不同事故致因的出现频率和事故致因之间的相互关系。研究结果显示:违规操作致因出现的频率最大,为35.71%;安全管理体系缺失致因、安全意识不足致因与违规操作致因共现次数最多,达3次;违规操作致因属于事故致因网络的中心位置且中心度最高,与其他致因关联性最强,是最中心的事故致因。 展开更多
关键词 高校实验室 安全事故 文本挖掘 事故致因
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Effects of in-situZrB_2 nanoparticles and scandium on microstructure and mechanical property of 7N01 aluminum alloy
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作者 Xizhou Kai Yuhui Wang +8 位作者 ruikun chen Yanjie Peng Anjun Shi Ran Tao Xiangfeng Liang Guirong Li Gang chen Xiaojing Xu Yutao Zhao 《Journal of Rare Earths》 SCIE EI CAS CSCD 2024年第3期612-620,I0007,共10页
In this study, the in-situ synthesized ZrB_(2) nanoparticles and rare earth Sc were introduced to enhance the strength and ductility of 7N01 aluminum alloy, via the generation of high-melting and uniform nanodispersoi... In this study, the in-situ synthesized ZrB_(2) nanoparticles and rare earth Sc were introduced to enhance the strength and ductility of 7N01 aluminum alloy, via the generation of high-melting and uniform nanodispersoids. The microstructure and mechanical property evolution of the prepared composites and the interaction between ZrB_(2) and Sc were studied in detail. The microstructure investigation shows that the introduction of rare earth scandium(Sc) can promote the distribution of ZrB_(2) nanoparticles, by improving their wettability to the Al melt. Meanwhile, the addition of rare earth Sc also modifies the coarse Al Zn Mg Mn Fe precipitated phases, refines the matrix grains and generates high-melting Al_3(Sc,Zr)/Al_3Sc nanodispersoids. Tensile tests of the composites show that with the combinatorial introduction of ZrB_(2) and Sc, the strength and ductility of the composites are improved simultaneously compared with the corresponding 7N01 alloy, ZrB_(2) /7N01 composite and Sc/7N01 alloy. And the optimum contents of ZrB_(2) and Sc are 3 wt% and 0.2 wt% in this study. The yield strength, ultimate strength and elongation of(3 wt% ZrB_(2) +0.2 wt% Sc)/7N01 composite are 477 MPa, 506 MPa and 9.8%, increased about 18.1%, 12.2%and 38% compared to 7N01 alloy. Furthermore, the cooperation strengthening mechanisms of ZrB_(2) and Sc are also discussed. 展开更多
关键词 7N01 aluminum alloy In-situ ZrB_(2)nanoparticles Rare earth Sc Microstructure Mechanical property Mechanism
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