固氮作用是生态系统生物地球化学循环的重要环节。目前对水生生态系统固氮作用的研究起步相对较晚,主要集中在海洋和湖泊等水体。为了解当前淡水湖泊固氮微生物的研究热点与发展趋势,本研究以Web of Science数据库中淡水湖泊固氮微生物...固氮作用是生态系统生物地球化学循环的重要环节。目前对水生生态系统固氮作用的研究起步相对较晚,主要集中在海洋和湖泊等水体。为了解当前淡水湖泊固氮微生物的研究热点与发展趋势,本研究以Web of Science数据库中淡水湖泊固氮微生物及相关领域的文献为数据源,运用CiteSpace和VOSviewer软件构建知识图谱,分析该研究领域的发文热点及未来研究趋势。在此基础上,通过文献整合分析,梳理了水体氮磷营养盐对固氮速率的影响及其可能的作用机制。结果表明,(1)1992-2024年全球淡水湖泊固氮微生物研究领域的出版物数量和引用频次不断增加。(2)国家、作者、机构合作网络分析显示,淡水湖泊固氮微生物研究是一个多学科交叉、多国家和机构合作的研究领域。(3)聚类分析结果表明,当前研究热点主要聚焦于3个方向:磷限制情境下的营养调控策略及其对蓝藻群落演替过程的生态响应;基于nifH基因的固氮微生物多样性解析及其在氮循环功能中的生态位特征;环境因子驱动下浮游植物群落结构的长期时空动态演替规律。(4)整合分析结果表明:固氮量化研究的地理分布区域不平衡,北美洲构建了涵盖多类型水体的综合指标体系,而亚洲、南美洲则侧重蓝藻生物量描述,欧洲多聚焦于氮磷动态变化和固氮过程的耦合关系;固氮生物物种研究以蓝藻门(长孢藻、束丝藻等)为主,变形菌、古菌等门类研究相对较少;总磷与固氮速率呈显著正相关关系,而与总溶解氮、硝态氮、铵态氮呈显著负相关关系。非线性分段模型拟合发现总磷对淡水湖泊固氮速率的调控存在临界值(25μg/L)。未来固氮过程研究在测定方法(如乙炔还原法与同位素示踪法)和计量单位(面积/体积单位)等方面亟需标准化以提高研究结果的可比性。本研究总结了淡水湖泊固氮微生物研究过去30年热点与前沿的变化趋势,建议通过引入多样化的分析指标(酶活性、转录组)、标准化的分析流程和多指标融合的评价方法,继续拓宽对淡水湖泊固氮过程及其生态贡献的认识。展开更多
乡村旅游营销研究越来越受到学界的关注,基于CiteSpace文献计量工具,对中国知网(CNKI)和Web of Science数据库中2000—2024年乡村旅游营销的相关文献进行可视化分析,从整体上把握其研究态势,为未来相关研究提供参考。共计纳入130篇中文...乡村旅游营销研究越来越受到学界的关注,基于CiteSpace文献计量工具,对中国知网(CNKI)和Web of Science数据库中2000—2024年乡村旅游营销的相关文献进行可视化分析,从整体上把握其研究态势,为未来相关研究提供参考。共计纳入130篇中文文献和586篇英文文献,对发文情况及关键词进行分析。结果表明:中文和英文文献发文量整体呈波动增长趋势,近三年国内外研究热点集中在网络营销、乡村振兴、内在机理、目的地形象、可持续发展、动机等方面,但侧重点各有所不同。展开更多
Objective: This study was conducted to understand the trends and research hotspots of clinical nursing in China and abroad, thereby to provide guidance for nursing practice and studies.Methods: We retrieved clinical n...Objective: This study was conducted to understand the trends and research hotspots of clinical nursing in China and abroad, thereby to provide guidance for nursing practice and studies.Methods: We retrieved clinical nursing literature(excluding literature related to psychological nursing and traditional Chinese medicine nursing) cited in Wanfang Data(www.wanfangdata.com.cn) and PubMed between 2007 and 2015 and subsequently performed bibliometric analyses on article volume,journal, clustering of high-frequency keywords, and co-occurrence of keywords.Results: A total of 10374 publications, excluding those related to psychological nursing, were retrieved via a PubMed search. The literature displayed a rising trend in terms of annual publication volume. The journal distribution of clinical nursing publications overall was consistent with Bradford's Law. The main contents of clinical nursing literature between 2007 and 2009 included:(1) studies on effects of the midwife and midwifery methods for natural childbirth;(2) studies on emergency nursing care;(3)studies on dementia care;(4) studies on bandage dressing in trauma nursing; and(5) studies on quality of life in cancer patients nursing. The main contents of clinical nursing literature between 2010 and 2012 included:(1) studies on obstetric nurse-patient relationships;(2) studies on patients' medical team in stroke nursing;(3) studies on cancer nursing methods;(4) studies on nursing patients with trauma related to urinary incontinence; and(5) studies on the quality of life of caregivers of dementia patients.The main contents of clinical nursing literature between 2013 and 2015 included(1) studies on skin care and bandaging in trauma nursing;(2) studies on evidence-based nursing in AIDS care;(3) studies on nurses' role in obstetric nurse-patient relationships; studies on cancer nursing methods;(4) studies on nursing for Alzheimer's disease and dementia; and(5) studies on caregivers and nursing of stroke patients. A Wanfang Data search retrieved a total of 85570 publications, whose volume also exhibited an annual rising trend, in particular with regard to those in core journals. However, percentage of total publication volume, mean cited frequency per article, and total ranking of clinical nursing publications overall displayed a decreasing trend. The main contents of clinical nursing literature between 2007 and 2009 included:(1) diabetes nursing;(2) nursing for cancer;(3) nursing for senility-related diseases;(4)nursing in the event of complications;(5) nursing for hypertension;(6) studies on quality of life after nursing interventions;(7) chemotherapy nursing;(8) studies on compliance after nursing interventions;(9) constipation nursing; and(10) nursing for stroke patients. The main contents of clinical nursing literature between 2010 and 2012 included:(1) diabetes nursing;(2) nursing for cancer;(3) nursing for senility-related diseases;(4) studies on quality of life after nursing interventions;(5) nursing in the event of complications;(6) nursing for hypertension;(7) prevention nursing;(8) perioperative nursing;(9)pain nursing; and(10) studies on compliance after nursing interventions. The main contents of clinical nursing literature between 2013 and 2015 included:(1) diabetes nursing;(2) nursing in the event of complications;(3) cancer nursing;(4) studies on quality of life after nursing interventions;(5) nursing for stroke patients;(6) nursing for the elderly;(7) studies on compliance after nursing interventions;(8)nursing for hypertension;(9) constipation nursing; and(10) prevention nursing.Conclusions: Clinical nursing research in China is in a rapid development stage as defined by Price's law whereby there is a rapid growth in publication volume. By comparison, clinical nursing research in developed countries is in the stable development stage or maturation phase, which is characterized by a flat curve of publication volume and stable development rate. There is a gap of 25-30 years between China and these countries in terms of the growth phases of clinical nursing literature.展开更多
Purpose： In this contribution we continue our investigations related to the activity index （A/） and its formal analogs. We try to replace the AI by an indicator which is better suited for policy applications. Desig...Purpose： In this contribution we continue our investigations related to the activity index （A/） and its formal analogs. We try to replace the AI by an indicator which is better suited for policy applications. Design/methodology/approach： We point out that fluctuations in the value of the AI for a given country and domain are never the result of that country＇s policy with respect to that domain alone because there are exogenous factors at play. For this reason we introduce the F-measure. This F-measure is nothing but the harmonic mean of the country＇s share in the world＇s publication output in the given domain and the given domain＇s share in the country＇s publication output.Findings： The F-measure does not suffer from the problems the AI does Research limitations： The indicator is not yet fully tested in real cases R＆D policy management： In policy considerations, the AI should better be replaced by the F-measure as this measure can better show the results of science policy measures （which the AI cannot as it depends on exogenous factors）. Originality/value： We provide an original solution for a problem that is not fully realized by policy makers.展开更多
目的本研究旨在对2019—2024年心房颤动研究热点进行可视化网络分析,以探索近五年心房颤动在预防、治疗、预后及相关研究中的热点和趋势,为中医药心房颤动研究与国际医疗需求接轨、取得国际化认可提供参考。方法研究对Web of Science Co...目的本研究旨在对2019—2024年心房颤动研究热点进行可视化网络分析,以探索近五年心房颤动在预防、治疗、预后及相关研究中的热点和趋势,为中医药心房颤动研究与国际医疗需求接轨、取得国际化认可提供参考。方法研究对Web of Science Core Collection(WOSCC)数据库进行文献检索,采用文献计量学方法分析预防、治疗和预后文献以及房颤弱相关文献。使用CiteSpace和R语言工具对研究关键词趋势和热点进行可视化分析,同时利用NoteExpress评估文献的引用频率。结果在预防方面,慢性肾病、氧化应激以及代谢综合征持续受到高度关注,成为重要的研究焦点。治疗领域则以导管消融和肺静脉隔离为核心,相关研究不断深入。在预后研究中,卒中预防和经皮冠状动脉介入治疗备受瞩目,关注度较高。而在关联研究方面,冠状动脉疾病和心源性猝死依然占据主导地位,是研究的重点方向。结论2019—2024年房颤研究呈现出多样化和复杂化的趋势。研究重点逐渐向慢性病相关因素、治疗技术的创新以及多学科融合等多方面转变。并逐渐引入机器学习等新技术。机器学习等技术的引入,预计将为房颤研究带来新的发展机遇,从而推动其创新发展。展开更多
【背景】蛹虫草(Cordyceps militaris)作为虫草科虫草属的模式种一直受到全球研究人员的关注。【目的】多维度探讨蛹虫草研究的当前状况与未来趋势。【方法】基于Web of Science核心合集数据库对2005-2024年间有关蛹虫草的SCI核心集论...【背景】蛹虫草(Cordyceps militaris)作为虫草科虫草属的模式种一直受到全球研究人员的关注。【目的】多维度探讨蛹虫草研究的当前状况与未来趋势。【方法】基于Web of Science核心合集数据库对2005-2024年间有关蛹虫草的SCI核心集论文进行了全面的数据搜集、整理、分析和可视化处理。【结果】过去20年里,蛹虫草研究已从单一的培养特性拓展至跨学科领域,尤其是其活性成分和药理学效应已成为学术界关注的焦点。文献计量分析结果显示,2005-2009年间,主要研究方向为蛹虫草的人工培养。2010-2014年间,研究主题扩展至子实体相关的药理学,研究地位显著提升。2015年后,研究主题进一步多元化,涵盖了优化、表达、氧化应激、真菌、抗氧化剂、化学成分、NF-κB、细胞周期停滞等领域,显示了从培养技术向深入的生物学和医学机制研究的转变。【结论】蛹虫草的研究经历了从传统培养研究向多学科交叉的深刻变革,未来研究将更加侧重于活性成分的功能机制、生物活性物质的药理作用及潜在的医学应用,为蛹虫草的深入研究和开发利用提供科学依据。展开更多
[目的]分析中医药治疗多发性硬化(multiple sclerosis,MS)的研究现状及热点,为其临床决策、后续研究及中西医结合诊疗指南构建提供参考。[方法]以中国知网、维普、万方、PubMed、Web of Science数据库为文献来源,检索2004年1月至2024年1...[目的]分析中医药治疗多发性硬化(multiple sclerosis,MS)的研究现状及热点,为其临床决策、后续研究及中西医结合诊疗指南构建提供参考。[方法]以中国知网、维普、万方、PubMed、Web of Science数据库为文献来源,检索2004年1月至2024年11月收录的相关文献。采用CiteSpace 6.3.R1软件对文献发表时间、作者、机构、关键词进行共现、聚类及突现等可视化分析,得出其研究现状及热点。[结果]共纳入文献168篇,中医药治疗MS领域的发文量近年无明显变化,而较高质量的临床研究占比增多;目前尚未形成稳定的核心作者群,研究机构集中在各大高校附属医院及中医药院校;高频和高中心性关键词包括辨证论治、名医经验、中西医结合、病因病机和中医证候。[结论]中医药治疗MS处于发展阶段,重点在病因病机及辨证论治研究,未来建议加强团队与机构合作,发展多中心网络,探索多学科交叉、多手段治疗,提高研究质量,为中医药治疗MS的临床决策提供高质量循证证据,以期完善治疗方案,构建中西医结合诊疗指南。展开更多
文摘固氮作用是生态系统生物地球化学循环的重要环节。目前对水生生态系统固氮作用的研究起步相对较晚,主要集中在海洋和湖泊等水体。为了解当前淡水湖泊固氮微生物的研究热点与发展趋势,本研究以Web of Science数据库中淡水湖泊固氮微生物及相关领域的文献为数据源,运用CiteSpace和VOSviewer软件构建知识图谱,分析该研究领域的发文热点及未来研究趋势。在此基础上,通过文献整合分析,梳理了水体氮磷营养盐对固氮速率的影响及其可能的作用机制。结果表明,(1)1992-2024年全球淡水湖泊固氮微生物研究领域的出版物数量和引用频次不断增加。(2)国家、作者、机构合作网络分析显示,淡水湖泊固氮微生物研究是一个多学科交叉、多国家和机构合作的研究领域。(3)聚类分析结果表明,当前研究热点主要聚焦于3个方向:磷限制情境下的营养调控策略及其对蓝藻群落演替过程的生态响应;基于nifH基因的固氮微生物多样性解析及其在氮循环功能中的生态位特征;环境因子驱动下浮游植物群落结构的长期时空动态演替规律。(4)整合分析结果表明:固氮量化研究的地理分布区域不平衡,北美洲构建了涵盖多类型水体的综合指标体系,而亚洲、南美洲则侧重蓝藻生物量描述,欧洲多聚焦于氮磷动态变化和固氮过程的耦合关系;固氮生物物种研究以蓝藻门(长孢藻、束丝藻等)为主,变形菌、古菌等门类研究相对较少;总磷与固氮速率呈显著正相关关系,而与总溶解氮、硝态氮、铵态氮呈显著负相关关系。非线性分段模型拟合发现总磷对淡水湖泊固氮速率的调控存在临界值(25μg/L)。未来固氮过程研究在测定方法(如乙炔还原法与同位素示踪法)和计量单位(面积/体积单位)等方面亟需标准化以提高研究结果的可比性。本研究总结了淡水湖泊固氮微生物研究过去30年热点与前沿的变化趋势,建议通过引入多样化的分析指标(酶活性、转录组)、标准化的分析流程和多指标融合的评价方法,继续拓宽对淡水湖泊固氮过程及其生态贡献的认识。
文摘乡村旅游营销研究越来越受到学界的关注,基于CiteSpace文献计量工具,对中国知网(CNKI)和Web of Science数据库中2000—2024年乡村旅游营销的相关文献进行可视化分析,从整体上把握其研究态势,为未来相关研究提供参考。共计纳入130篇中文文献和586篇英文文献,对发文情况及关键词进行分析。结果表明:中文和英文文献发文量整体呈波动增长趋势,近三年国内外研究热点集中在网络营销、乡村振兴、内在机理、目的地形象、可持续发展、动机等方面,但侧重点各有所不同。
基金supported by Scientific Research Project of Shanxi Provincial Health Department,China(No.201201031)
文摘Objective: This study was conducted to understand the trends and research hotspots of clinical nursing in China and abroad, thereby to provide guidance for nursing practice and studies.Methods: We retrieved clinical nursing literature(excluding literature related to psychological nursing and traditional Chinese medicine nursing) cited in Wanfang Data(www.wanfangdata.com.cn) and PubMed between 2007 and 2015 and subsequently performed bibliometric analyses on article volume,journal, clustering of high-frequency keywords, and co-occurrence of keywords.Results: A total of 10374 publications, excluding those related to psychological nursing, were retrieved via a PubMed search. The literature displayed a rising trend in terms of annual publication volume. The journal distribution of clinical nursing publications overall was consistent with Bradford's Law. The main contents of clinical nursing literature between 2007 and 2009 included:(1) studies on effects of the midwife and midwifery methods for natural childbirth;(2) studies on emergency nursing care;(3)studies on dementia care;(4) studies on bandage dressing in trauma nursing; and(5) studies on quality of life in cancer patients nursing. The main contents of clinical nursing literature between 2010 and 2012 included:(1) studies on obstetric nurse-patient relationships;(2) studies on patients' medical team in stroke nursing;(3) studies on cancer nursing methods;(4) studies on nursing patients with trauma related to urinary incontinence; and(5) studies on the quality of life of caregivers of dementia patients.The main contents of clinical nursing literature between 2013 and 2015 included(1) studies on skin care and bandaging in trauma nursing;(2) studies on evidence-based nursing in AIDS care;(3) studies on nurses' role in obstetric nurse-patient relationships; studies on cancer nursing methods;(4) studies on nursing for Alzheimer's disease and dementia; and(5) studies on caregivers and nursing of stroke patients. A Wanfang Data search retrieved a total of 85570 publications, whose volume also exhibited an annual rising trend, in particular with regard to those in core journals. However, percentage of total publication volume, mean cited frequency per article, and total ranking of clinical nursing publications overall displayed a decreasing trend. The main contents of clinical nursing literature between 2007 and 2009 included:(1) diabetes nursing;(2) nursing for cancer;(3) nursing for senility-related diseases;(4)nursing in the event of complications;(5) nursing for hypertension;(6) studies on quality of life after nursing interventions;(7) chemotherapy nursing;(8) studies on compliance after nursing interventions;(9) constipation nursing; and(10) nursing for stroke patients. The main contents of clinical nursing literature between 2010 and 2012 included:(1) diabetes nursing;(2) nursing for cancer;(3) nursing for senility-related diseases;(4) studies on quality of life after nursing interventions;(5) nursing in the event of complications;(6) nursing for hypertension;(7) prevention nursing;(8) perioperative nursing;(9)pain nursing; and(10) studies on compliance after nursing interventions. The main contents of clinical nursing literature between 2013 and 2015 included:(1) diabetes nursing;(2) nursing in the event of complications;(3) cancer nursing;(4) studies on quality of life after nursing interventions;(5) nursing for stroke patients;(6) nursing for the elderly;(7) studies on compliance after nursing interventions;(8)nursing for hypertension;(9) constipation nursing; and(10) prevention nursing.Conclusions: Clinical nursing research in China is in a rapid development stage as defined by Price's law whereby there is a rapid growth in publication volume. By comparison, clinical nursing research in developed countries is in the stable development stage or maturation phase, which is characterized by a flat curve of publication volume and stable development rate. There is a gap of 25-30 years between China and these countries in terms of the growth phases of clinical nursing literature.
文摘Purpose： In this contribution we continue our investigations related to the activity index （A/） and its formal analogs. We try to replace the AI by an indicator which is better suited for policy applications. Design/methodology/approach： We point out that fluctuations in the value of the AI for a given country and domain are never the result of that country＇s policy with respect to that domain alone because there are exogenous factors at play. For this reason we introduce the F-measure. This F-measure is nothing but the harmonic mean of the country＇s share in the world＇s publication output in the given domain and the given domain＇s share in the country＇s publication output.Findings： The F-measure does not suffer from the problems the AI does Research limitations： The indicator is not yet fully tested in real cases R＆D policy management： In policy considerations, the AI should better be replaced by the F-measure as this measure can better show the results of science policy measures （which the AI cannot as it depends on exogenous factors）. Originality/value： We provide an original solution for a problem that is not fully realized by policy makers.
文摘目的本研究旨在对2019—2024年心房颤动研究热点进行可视化网络分析,以探索近五年心房颤动在预防、治疗、预后及相关研究中的热点和趋势,为中医药心房颤动研究与国际医疗需求接轨、取得国际化认可提供参考。方法研究对Web of Science Core Collection(WOSCC)数据库进行文献检索,采用文献计量学方法分析预防、治疗和预后文献以及房颤弱相关文献。使用CiteSpace和R语言工具对研究关键词趋势和热点进行可视化分析,同时利用NoteExpress评估文献的引用频率。结果在预防方面,慢性肾病、氧化应激以及代谢综合征持续受到高度关注,成为重要的研究焦点。治疗领域则以导管消融和肺静脉隔离为核心,相关研究不断深入。在预后研究中,卒中预防和经皮冠状动脉介入治疗备受瞩目,关注度较高。而在关联研究方面,冠状动脉疾病和心源性猝死依然占据主导地位,是研究的重点方向。结论2019—2024年房颤研究呈现出多样化和复杂化的趋势。研究重点逐渐向慢性病相关因素、治疗技术的创新以及多学科融合等多方面转变。并逐渐引入机器学习等新技术。机器学习等技术的引入,预计将为房颤研究带来新的发展机遇,从而推动其创新发展。
文摘【背景】蛹虫草(Cordyceps militaris)作为虫草科虫草属的模式种一直受到全球研究人员的关注。【目的】多维度探讨蛹虫草研究的当前状况与未来趋势。【方法】基于Web of Science核心合集数据库对2005-2024年间有关蛹虫草的SCI核心集论文进行了全面的数据搜集、整理、分析和可视化处理。【结果】过去20年里,蛹虫草研究已从单一的培养特性拓展至跨学科领域,尤其是其活性成分和药理学效应已成为学术界关注的焦点。文献计量分析结果显示,2005-2009年间,主要研究方向为蛹虫草的人工培养。2010-2014年间,研究主题扩展至子实体相关的药理学,研究地位显著提升。2015年后,研究主题进一步多元化,涵盖了优化、表达、氧化应激、真菌、抗氧化剂、化学成分、NF-κB、细胞周期停滞等领域,显示了从培养技术向深入的生物学和医学机制研究的转变。【结论】蛹虫草的研究经历了从传统培养研究向多学科交叉的深刻变革,未来研究将更加侧重于活性成分的功能机制、生物活性物质的药理作用及潜在的医学应用,为蛹虫草的深入研究和开发利用提供科学依据。
文摘[目的]分析中医药治疗多发性硬化(multiple sclerosis,MS)的研究现状及热点,为其临床决策、后续研究及中西医结合诊疗指南构建提供参考。[方法]以中国知网、维普、万方、PubMed、Web of Science数据库为文献来源,检索2004年1月至2024年11月收录的相关文献。采用CiteSpace 6.3.R1软件对文献发表时间、作者、机构、关键词进行共现、聚类及突现等可视化分析,得出其研究现状及热点。[结果]共纳入文献168篇,中医药治疗MS领域的发文量近年无明显变化,而较高质量的临床研究占比增多;目前尚未形成稳定的核心作者群,研究机构集中在各大高校附属医院及中医药院校;高频和高中心性关键词包括辨证论治、名医经验、中西医结合、病因病机和中医证候。[结论]中医药治疗MS处于发展阶段,重点在病因病机及辨证论治研究,未来建议加强团队与机构合作,发展多中心网络,探索多学科交叉、多手段治疗,提高研究质量,为中医药治疗MS的临床决策提供高质量循证证据,以期完善治疗方案,构建中西医结合诊疗指南。
