The X-band phased array radar offers faster scanning speed and higher spatial resolution compared to the S-band radar,making it capable of enhancing tornado monitoring and early warning capabilities.This study analyze...The X-band phased array radar offers faster scanning speed and higher spatial resolution compared to the S-band radar,making it capable of enhancing tornado monitoring and early warning capabilities.This study analyzed the characteristics and nowcasting signals of a tornado case that occurred on June 16,2022 in the Guangzhou region.Our findings indicate that the violent contraction of rotation radius and the dramatic increase in rotation speed were important signal characteristics associated with tornado formation.The X-band phased array radar,with its high temporal and spatial resolution,provided an opportunity to capture early warning signals from polarimetric characteristics.The X-band phased array radar demonstrated noteworthy ability to identify apparent tornado vortex signature(TVS)features in a 10-minute lead time,surpassing the capabilities of the CINRAD/SA radar.Additionally,due to its higher scanning frequency,the Xband phased-array radar was capable of consistently identifying TVS with shorter intervals,enabling a more precise tracking of the tornado's path.The application of professional radars,in this case,provides valuable insights for the monitoring of evolutions of severe local storms and even tornadoes and the issuance of early warning signals.展开更多
目的:探究吸入疗法治疗呼吸系统疾病的全球研究现状和研究热点,为我国未来该领域的进一步发展提供参考。方法:检索Web of Science数据库中自建库起至2020年1月1日的有关吸入疗法治疗呼吸系统疾病的所有文献。运用Web of Science自带的...目的:探究吸入疗法治疗呼吸系统疾病的全球研究现状和研究热点,为我国未来该领域的进一步发展提供参考。方法:检索Web of Science数据库中自建库起至2020年1月1日的有关吸入疗法治疗呼吸系统疾病的所有文献。运用Web of Science自带的检索结果分析功能并结合CiteSpace 5.1.R6SE软件的可视化分析功能,分别从年发文量、国家、机构、学科类别、共被引作者等方面分析该领域的研究情况;对关键词绘制知识图谱,并进行聚类分析和突发性探测,分析该领域的研究热点及发展进程。结果:共纳入1385篇文献。1947-2020年的年发文量总体呈上升趋势;开展相关研究的国家有66个,美国处于领先地位(发文量占总发文量的33.79%),其次为德国和英国(发文量分别占总发文量的10.32%、8.88%),而我国在该领域的发文量仅占总发文量的3.75%;参与该类研究的机构涉及了呼吸疾病研究所、综合性大学和国家职业安全卫生研究所,其中排名靠前的主要为悉尼大学、北卡罗来纳大学、哈佛大学等;涉及学科类别包括分子生物学、内科学、药理学、工程学等多个领域;共被引作者共有749位,排名前2位的作者的共被引频次分别为109、84次。通过聚类分析得到了该领域中包括吸入给药的剂型及工艺设计、吸入用药物作用机制、吸入疗法用于呼吸系统阻塞性疾病、吸入疗法用于呼吸系统感染性疾病、吸入疗法用于呼吸系统疾病的特殊人群、吸入疗法用于呼吸系统疾病的危险因素等6大研究热点。通过突发性探测发现,在20世纪90年代初期该领域研究非常活跃,接连出现了多个研究热点。在21世纪初期也短暂地出现了几个新的研究热点,如计量吸入器、气溶胶等,至21世纪20年代,相继出现了纳米粒子、人体试验等研究热点。结论:吸入疗法治疗呼吸系统疾病的研究在国际上一直呈稳步上升趋势,而我国在该领域的研究还十分有限。未来我国可关注国际上该领域的研究热点与方向,进一步加强与其他国家的交流与合作。展开更多
Snowed Up:A Mistletoe Story,a previously unpublished short story of Richard Jefferies,has been studied from many different approaches,but few papers discuss it from the perspective of Deconstruction.This paper will de...Snowed Up:A Mistletoe Story,a previously unpublished short story of Richard Jefferies,has been studied from many different approaches,but few papers discuss it from the perspective of Deconstruction.This paper will deconstruct Snowed Up:A Mistletoe Story from three binary oppositions:1) the upper class and the lower class;2) nature and civilization;3) Edie' s inner voice and her actual behavior.Besides,this paper will also try to deconstruct the traditional patriarchy through Edie ' s papa.Analyzing this novel from deconstructive approach will provide readers a deep insight into Richard Jefferies work.展开更多
基金National Key R&D Program of China (2022YFC3004101)Science and Technology Projects of Guangzhou (2023B04J0704,2023B04J0232)+1 种基金Natural Science Foundation of Guangdong Province (2022A15150118141)Key Scientific and Technological Research Project of Guangzhou Meteorological Society (Z202201)。
文摘The X-band phased array radar offers faster scanning speed and higher spatial resolution compared to the S-band radar,making it capable of enhancing tornado monitoring and early warning capabilities.This study analyzed the characteristics and nowcasting signals of a tornado case that occurred on June 16,2022 in the Guangzhou region.Our findings indicate that the violent contraction of rotation radius and the dramatic increase in rotation speed were important signal characteristics associated with tornado formation.The X-band phased array radar,with its high temporal and spatial resolution,provided an opportunity to capture early warning signals from polarimetric characteristics.The X-band phased array radar demonstrated noteworthy ability to identify apparent tornado vortex signature(TVS)features in a 10-minute lead time,surpassing the capabilities of the CINRAD/SA radar.Additionally,due to its higher scanning frequency,the Xband phased-array radar was capable of consistently identifying TVS with shorter intervals,enabling a more precise tracking of the tornado's path.The application of professional radars,in this case,provides valuable insights for the monitoring of evolutions of severe local storms and even tornadoes and the issuance of early warning signals.
文摘目的:探究吸入疗法治疗呼吸系统疾病的全球研究现状和研究热点,为我国未来该领域的进一步发展提供参考。方法:检索Web of Science数据库中自建库起至2020年1月1日的有关吸入疗法治疗呼吸系统疾病的所有文献。运用Web of Science自带的检索结果分析功能并结合CiteSpace 5.1.R6SE软件的可视化分析功能,分别从年发文量、国家、机构、学科类别、共被引作者等方面分析该领域的研究情况;对关键词绘制知识图谱,并进行聚类分析和突发性探测,分析该领域的研究热点及发展进程。结果:共纳入1385篇文献。1947-2020年的年发文量总体呈上升趋势;开展相关研究的国家有66个,美国处于领先地位(发文量占总发文量的33.79%),其次为德国和英国(发文量分别占总发文量的10.32%、8.88%),而我国在该领域的发文量仅占总发文量的3.75%;参与该类研究的机构涉及了呼吸疾病研究所、综合性大学和国家职业安全卫生研究所,其中排名靠前的主要为悉尼大学、北卡罗来纳大学、哈佛大学等;涉及学科类别包括分子生物学、内科学、药理学、工程学等多个领域;共被引作者共有749位,排名前2位的作者的共被引频次分别为109、84次。通过聚类分析得到了该领域中包括吸入给药的剂型及工艺设计、吸入用药物作用机制、吸入疗法用于呼吸系统阻塞性疾病、吸入疗法用于呼吸系统感染性疾病、吸入疗法用于呼吸系统疾病的特殊人群、吸入疗法用于呼吸系统疾病的危险因素等6大研究热点。通过突发性探测发现,在20世纪90年代初期该领域研究非常活跃,接连出现了多个研究热点。在21世纪初期也短暂地出现了几个新的研究热点,如计量吸入器、气溶胶等,至21世纪20年代,相继出现了纳米粒子、人体试验等研究热点。结论:吸入疗法治疗呼吸系统疾病的研究在国际上一直呈稳步上升趋势,而我国在该领域的研究还十分有限。未来我国可关注国际上该领域的研究热点与方向,进一步加强与其他国家的交流与合作。
文摘Snowed Up:A Mistletoe Story,a previously unpublished short story of Richard Jefferies,has been studied from many different approaches,but few papers discuss it from the perspective of Deconstruction.This paper will deconstruct Snowed Up:A Mistletoe Story from three binary oppositions:1) the upper class and the lower class;2) nature and civilization;3) Edie' s inner voice and her actual behavior.Besides,this paper will also try to deconstruct the traditional patriarchy through Edie ' s papa.Analyzing this novel from deconstructive approach will provide readers a deep insight into Richard Jefferies work.
