English teaching methodology is the guidance in the process of English teaching. Based on the analysis of multi-source data, quantitative research and visualized analysis, we are aimed to analyze the frontier of Engli...English teaching methodology is the guidance in the process of English teaching. Based on the analysis of multi-source data, quantitative research and visualized analysis, we are aimed to analyze the frontier of English teaching methodology and try to explore the advanced English teaching methodology, improve the English teaching and provide the scientific data and appropriate methods for the local English teaching.展开更多
This paper is concerned with a study on the efficient frontier characters of portfolio with transaction cost. The conclusion is drawn that all portfolios are of positive correlation on the efficient frontier with tran...This paper is concerned with a study on the efficient frontier characters of portfolio with transaction cost. The conclusion is drawn that all portfolios are of positive correlation on the efficient frontier with transaction cost; the sufficient condition for the derivable efficient frontier has also been achieved. Meanwhile, in comparison with the position of the efficient frontier without transaction cost in the plane (σ 2,R), the conclusion has been made that the efficient frontiers with transaction cost drift and its opening shrinks correspondingly. With this study, the content of the efficient frontier is further enriched. It’s very constructive and important for the practical portfolio investment strategy.展开更多
随着锂电池领域论文数量的激增和研究主题的日益丰富,准确监测该领域的发展趋势和把握最新研究动向变得日益复杂。通过运用大数据和机器学习技术,采用BERTopic主题模型对Web of Science数据库中的18万余篇锂电池论文进行文本分析,绘制...随着锂电池领域论文数量的激增和研究主题的日益丰富,准确监测该领域的发展趋势和把握最新研究动向变得日益复杂。通过运用大数据和机器学习技术,采用BERTopic主题模型对Web of Science数据库中的18万余篇锂电池论文进行文本分析,绘制了锂电池领域的主题图,识别了新兴研究主题和高被引主题。结果表明,锂电池研究活动正显著加速,锂硫电池、锂枝晶生长抑制、电池回收和金属回收等新兴主题快速发展,而材料研究如二硫化钼纳米材料、氧化铁电极材料则具有显著的高学术影响力。研究还探讨了《锂电池百篇论文点评系列》对当前锂电池研究主题的监测情况,该系列对多数科学技术主题有良好覆盖。本研究为锂电池领域的主题监测提供了新方法,为政策制定和技术研发提供了情报支持,并为“锂电池百篇论文点评”系列的后续研究提供了参考。展开更多
In a recent paper published in Phys.Rev.Lett.133,152503(2024),H.Zhang,T.Li,and X.Wang predicted that modern intense lasers can induce highly nonlinear responses in the 229 Th nucleus for the first time,which is an ast...In a recent paper published in Phys.Rev.Lett.133,152503(2024),H.Zhang,T.Li,and X.Wang predicted that modern intense lasers can induce highly nonlinear responses in the 229 Th nucleus for the first time,which is an astonishing effect of light-nucleus interactions.This phenomenon is underpinned by two key factors:(1)the presence of a very low-lying nuclear excited state and(2)a nuclear hyperfine mixing effect that significantly enhances light-nucleus coupling.The resulting highly nonlinear responses facilitate efficient nuclear excitation and enable coherent light emission from the nucleus,resulting in high harmonic generation.229 Th presents a promising platform for advancements in both laser-nuclear physics and nuclear clock development.The pioneering work by Zhang et al.marks a new frontier in light-matter interactions.展开更多
目的神经病理性疼痛(NPP)的信号通路机制是一个广泛受关注的领域,本研究为该领域的热点和发展趋势提供信息。方法基于Web of Science数据库,利用CiteSpace分析软件生成知识图谱,检索日期为2004年1月1日至2023年6月30日。结果中国和美国...目的神经病理性疼痛(NPP)的信号通路机制是一个广泛受关注的领域,本研究为该领域的热点和发展趋势提供信息。方法基于Web of Science数据库,利用CiteSpace分析软件生成知识图谱,检索日期为2004年1月1日至2023年6月30日。结果中国和美国发表的文章占比位居前列,分别占43.85%和18.15%。文章发表位居前2位的机构是中山大学和浙江中医药大学。国家之间的合作有一定的地域性,作者团队间彼此存在一定的合作,但以疏散团队为主。关键词分析表明过去老鼠实验是研究热门,而蛋白质和星形胶质细胞成为新热点。结论NPP领域中信号通路的深化研究是主流的趋势,而小胶质细胞是神经病理性疼痛主要的研究方向,干细胞疗法和间充质干细胞衍生的细胞外载体/外泌体为潜在治疗手段。展开更多
文摘English teaching methodology is the guidance in the process of English teaching. Based on the analysis of multi-source data, quantitative research and visualized analysis, we are aimed to analyze the frontier of English teaching methodology and try to explore the advanced English teaching methodology, improve the English teaching and provide the scientific data and appropriate methods for the local English teaching.
文摘This paper is concerned with a study on the efficient frontier characters of portfolio with transaction cost. The conclusion is drawn that all portfolios are of positive correlation on the efficient frontier with transaction cost; the sufficient condition for the derivable efficient frontier has also been achieved. Meanwhile, in comparison with the position of the efficient frontier without transaction cost in the plane (σ 2,R), the conclusion has been made that the efficient frontiers with transaction cost drift and its opening shrinks correspondingly. With this study, the content of the efficient frontier is further enriched. It’s very constructive and important for the practical portfolio investment strategy.
文摘随着锂电池领域论文数量的激增和研究主题的日益丰富,准确监测该领域的发展趋势和把握最新研究动向变得日益复杂。通过运用大数据和机器学习技术,采用BERTopic主题模型对Web of Science数据库中的18万余篇锂电池论文进行文本分析,绘制了锂电池领域的主题图,识别了新兴研究主题和高被引主题。结果表明,锂电池研究活动正显著加速,锂硫电池、锂枝晶生长抑制、电池回收和金属回收等新兴主题快速发展,而材料研究如二硫化钼纳米材料、氧化铁电极材料则具有显著的高学术影响力。研究还探讨了《锂电池百篇论文点评系列》对当前锂电池研究主题的监测情况,该系列对多数科学技术主题有良好覆盖。本研究为锂电池领域的主题监测提供了新方法,为政策制定和技术研发提供了情报支持,并为“锂电池百篇论文点评”系列的后续研究提供了参考。
文摘In a recent paper published in Phys.Rev.Lett.133,152503(2024),H.Zhang,T.Li,and X.Wang predicted that modern intense lasers can induce highly nonlinear responses in the 229 Th nucleus for the first time,which is an astonishing effect of light-nucleus interactions.This phenomenon is underpinned by two key factors:(1)the presence of a very low-lying nuclear excited state and(2)a nuclear hyperfine mixing effect that significantly enhances light-nucleus coupling.The resulting highly nonlinear responses facilitate efficient nuclear excitation and enable coherent light emission from the nucleus,resulting in high harmonic generation.229 Th presents a promising platform for advancements in both laser-nuclear physics and nuclear clock development.The pioneering work by Zhang et al.marks a new frontier in light-matter interactions.
文摘目的神经病理性疼痛(NPP)的信号通路机制是一个广泛受关注的领域,本研究为该领域的热点和发展趋势提供信息。方法基于Web of Science数据库,利用CiteSpace分析软件生成知识图谱,检索日期为2004年1月1日至2023年6月30日。结果中国和美国发表的文章占比位居前列,分别占43.85%和18.15%。文章发表位居前2位的机构是中山大学和浙江中医药大学。国家之间的合作有一定的地域性,作者团队间彼此存在一定的合作,但以疏散团队为主。关键词分析表明过去老鼠实验是研究热门,而蛋白质和星形胶质细胞成为新热点。结论NPP领域中信号通路的深化研究是主流的趋势,而小胶质细胞是神经病理性疼痛主要的研究方向,干细胞疗法和间充质干细胞衍生的细胞外载体/外泌体为潜在治疗手段。
