【目的】分析Hindawi期刊批量撤销的论文的部分特征,以期为中国科技期刊处理对出版流程的系统性操纵提供参考。【方法】从Hindawi XML文集获取撤稿声明与被撤销论文。基于Web of Science核心合集分析被撤销论文的作者所属机构与被引用...【目的】分析Hindawi期刊批量撤销的论文的部分特征,以期为中国科技期刊处理对出版流程的系统性操纵提供参考。【方法】从Hindawi XML文集获取撤稿声明与被撤销论文。基于Web of Science核心合集分析被撤销论文的作者所属机构与被引用情况。【结果】Hindawi期刊在2022年11月16日至2024年3月20日共撤销11371篇论文。74.7%的被撤销论文发表于2022年,从投稿到接收平均经过46日,从投稿到发表平均经过77日,从发表到被撤销平均经过526日。同期发文量排名前50的中国机构参与发表18.6%的被撤销论文。【结论】批量撤销牵涉到对出版流程系统性操纵的论文,是出版商打击“论文工厂”的实践。尽管绝大部分被批量撤销的论文有来自中国的作者,但不能认为被撤销论文的作者对中国科研人员具有代表性。中国科技期刊应避免由编辑失职导致出版流程被操纵,科研机构应加强科研诚信教育以避免中国作者卷入类似事件。展开更多
Nanocarbon as an eco-friendly and abundant material has strong multi-color fluorescence, which makes it a promising candidate for healthy lighting and display. However, the low fluorescence efficiency and poor stabili...Nanocarbon as an eco-friendly and abundant material has strong multi-color fluorescence, which makes it a promising candidate for healthy lighting and display. However, the low fluorescence efficiency and poor stability of multi-color carbon nanoparticle（CNP） phosphors are main hurdles that hinder their applications. This work demonstrated efficient and stable multi-color CNP phosphors through synergy between inner polar groups and outer silica matrix. The polar groups in polyethylene glycol（PEG） 6,000 are favor of high fluorescence of the CNP phosphors, and the low melting point（64℃） of PEG 6,000 helps to improve the thermal stability of the phosphors, while the silica matrix provides protection to the phosphors. Based on this design,blue, green, yellow and red CNP phosphors with photoluminescence quantum yield of 53.1%, 47.4%, 43.8% and 42.3% have been achieved, all of which are the best values in ever reported multi-color CNP phosphors. Furthermore, the fluorescence of the CNP phosphors keeps almost unchanged at 100℃ and degrades little in one month, indicating their good thermal tolerance and temporal stability. In addition, multicolor devices including white light-emitting devices（LEDs）have been realized by coating the CNP phosphors onto UV chips. The luminous efficiency, correlated color temperature,Commission Internationale de L＇Eclairage and color rendering index of the white LED can reach 12 lm W^-1, 6,107 K,（0.32, 0.33） and 89, respectively, indicating the potential applications of the CNP phosphors in lighting and display.展开更多
文摘【目的】分析Hindawi期刊批量撤销的论文的部分特征,以期为中国科技期刊处理对出版流程的系统性操纵提供参考。【方法】从Hindawi XML文集获取撤稿声明与被撤销论文。基于Web of Science核心合集分析被撤销论文的作者所属机构与被引用情况。【结果】Hindawi期刊在2022年11月16日至2024年3月20日共撤销11371篇论文。74.7%的被撤销论文发表于2022年,从投稿到接收平均经过46日,从投稿到发表平均经过77日,从发表到被撤销平均经过526日。同期发文量排名前50的中国机构参与发表18.6%的被撤销论文。【结论】批量撤销牵涉到对出版流程系统性操纵的论文,是出版商打击“论文工厂”的实践。尽管绝大部分被批量撤销的论文有来自中国的作者,但不能认为被撤销论文的作者对中国科研人员具有代表性。中国科技期刊应避免由编辑失职导致出版流程被操纵,科研机构应加强科研诚信教育以避免中国作者卷入类似事件。
基金supported by the National Natural Science Foundation of China (21601159, 61604132, 61505033, 11374296, 61404039)the National Science Fund for Distinguished Young Scholars (61425021)
文摘Nanocarbon as an eco-friendly and abundant material has strong multi-color fluorescence, which makes it a promising candidate for healthy lighting and display. However, the low fluorescence efficiency and poor stability of multi-color carbon nanoparticle（CNP） phosphors are main hurdles that hinder their applications. This work demonstrated efficient and stable multi-color CNP phosphors through synergy between inner polar groups and outer silica matrix. The polar groups in polyethylene glycol（PEG） 6,000 are favor of high fluorescence of the CNP phosphors, and the low melting point（64℃） of PEG 6,000 helps to improve the thermal stability of the phosphors, while the silica matrix provides protection to the phosphors. Based on this design,blue, green, yellow and red CNP phosphors with photoluminescence quantum yield of 53.1%, 47.4%, 43.8% and 42.3% have been achieved, all of which are the best values in ever reported multi-color CNP phosphors. Furthermore, the fluorescence of the CNP phosphors keeps almost unchanged at 100℃ and degrades little in one month, indicating their good thermal tolerance and temporal stability. In addition, multicolor devices including white light-emitting devices（LEDs）have been realized by coating the CNP phosphors onto UV chips. The luminous efficiency, correlated color temperature,Commission Internationale de L＇Eclairage and color rendering index of the white LED can reach 12 lm W^-1, 6,107 K,（0.32, 0.33） and 89, respectively, indicating the potential applications of the CNP phosphors in lighting and display.
