目的:探究中药黄精产业领域的现状、研究热点及研究前沿,为今后黄精相关研究提供参考。方法:收集中国期刊全文数据库(CNKI)和Web of Science自建库至2022年12月31日与中药黄精研究的相关文献,以文献计量学为理论支持,基于CiteSpace6.1.R...目的:探究中药黄精产业领域的现状、研究热点及研究前沿,为今后黄精相关研究提供参考。方法:收集中国期刊全文数据库(CNKI)和Web of Science自建库至2022年12月31日与中药黄精研究的相关文献,以文献计量学为理论支持,基于CiteSpace6.1.R6与Excel软件,对发文趋势、作者、研究机构、关键词等内容进行可视化图谱分析。结果:最终纳入中文相关文献2420篇、英文相关文献210篇。中英文文献年发文量均整体呈上升态势,赵致和顾雯分别是中、英文文献产出量最高的作者,贵州大学和云南中医药大学分别为中、英文文献量最多的研究机构。研究热点主要集中在品种选育栽培、临床应用、化学成分与机制研究,其中品种培育、总皂苷、复方临床应用、林下种植可能是中药黄精产业未来的研究焦点。结论:目前中药黄精产业正处在备受关注的快速发展阶段,当下的研究重点内容主要为黄精多糖和栽培技术,其药理研究宽泛不够深入及临床研究匮乏等各方因素不利于产业健康发展,建议各研究团队及国内外相关平台间加强合作交流,聚焦研究热点与前沿并深入研究,推动产业创新改革发展。展开更多
Atomizing rainfall caused by flood discharge of high dams poses a great threat to the safety of powerhouse and ecological environment.As an indispensable means,numerical calculation is widely used in the safety design...Atomizing rainfall caused by flood discharge of high dams poses a great threat to the safety of powerhouse and ecological environment.As an indispensable means,numerical calculation is widely used in the safety design of discharge structures.The distribution of rainfall intensity is closely related to the trajectory nappe shape,jet trajectory distances,the splashed water droplet diameter and its velocity,and the spatial distribution of downstream nappe wind.In this paper,an experimental result is used to verify the improved stochastic splash mathematical model under different bucket types and discharge conditions,and the sensitivity of downstream rainfall intensity distribution to the shape of trajectory nappe,discharge flow,spatial distribution of downstream nappe wind,and the corresponding relationship between the droplet diameter and its splashing velocity is analyzed.The results show that the calculation accuracy of downstream rainfall intensity distribution is significantly improved when the above factors are taken into consideration.It is found that the bucket type and flood discharge rate play the greatest role in the rainfall intensity distribution,followed by the downstream nappe wind distribution,and finally the corresponding relationship between the diameter and velocity of splash droplets.Therefore,these factors should be considered comprehensively when the rainfall intensity distribution of flood discharge atomization is calculated.This study can help us to understand the influence factors of flood discharge atomization more deeply and predict the distribution of flood discharge atomization rainfall intensity more accurately.展开更多
文摘目的:探究中药黄精产业领域的现状、研究热点及研究前沿,为今后黄精相关研究提供参考。方法:收集中国期刊全文数据库(CNKI)和Web of Science自建库至2022年12月31日与中药黄精研究的相关文献,以文献计量学为理论支持,基于CiteSpace6.1.R6与Excel软件,对发文趋势、作者、研究机构、关键词等内容进行可视化图谱分析。结果:最终纳入中文相关文献2420篇、英文相关文献210篇。中英文文献年发文量均整体呈上升态势,赵致和顾雯分别是中、英文文献产出量最高的作者,贵州大学和云南中医药大学分别为中、英文文献量最多的研究机构。研究热点主要集中在品种选育栽培、临床应用、化学成分与机制研究,其中品种培育、总皂苷、复方临床应用、林下种植可能是中药黄精产业未来的研究焦点。结论:目前中药黄精产业正处在备受关注的快速发展阶段,当下的研究重点内容主要为黄精多糖和栽培技术,其药理研究宽泛不够深入及临床研究匮乏等各方因素不利于产业健康发展,建议各研究团队及国内外相关平台间加强合作交流,聚焦研究热点与前沿并深入研究,推动产业创新改革发展。
基金supported by the National Natural Science Foundation of China(Grant Nos.U1765202,U20A20316,515779167)the Foundation for Innovative Research Groups of the Natural Science Foundation of Hebei Province of China(Grant No.E2020402074)。
文摘Atomizing rainfall caused by flood discharge of high dams poses a great threat to the safety of powerhouse and ecological environment.As an indispensable means,numerical calculation is widely used in the safety design of discharge structures.The distribution of rainfall intensity is closely related to the trajectory nappe shape,jet trajectory distances,the splashed water droplet diameter and its velocity,and the spatial distribution of downstream nappe wind.In this paper,an experimental result is used to verify the improved stochastic splash mathematical model under different bucket types and discharge conditions,and the sensitivity of downstream rainfall intensity distribution to the shape of trajectory nappe,discharge flow,spatial distribution of downstream nappe wind,and the corresponding relationship between the droplet diameter and its splashing velocity is analyzed.The results show that the calculation accuracy of downstream rainfall intensity distribution is significantly improved when the above factors are taken into consideration.It is found that the bucket type and flood discharge rate play the greatest role in the rainfall intensity distribution,followed by the downstream nappe wind distribution,and finally the corresponding relationship between the diameter and velocity of splash droplets.Therefore,these factors should be considered comprehensively when the rainfall intensity distribution of flood discharge atomization is calculated.This study can help us to understand the influence factors of flood discharge atomization more deeply and predict the distribution of flood discharge atomization rainfall intensity more accurately.