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Critical metals are indispensable to a world seeking to transition away from carbon. Yet their extraction, processing, and application leave an unsustainable global environment and climate change footprint. To capture the development dynamics and research emphases of critical metals throughout their life cycle, this paper adopts bibliometrics to an...
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Citations
... The most commonly used database for bibliometric analysis is Web of Science Core Collection, which has a huge selection of journal categories. Compared to other databases, the Web of Science Core Collection is considered to be the best source of data for bibliometric studies because it is the most detailed, transparent, and extensive [19][20][21]. The search formula for Web of Science Core Collection used in this study was as follows: TS = (cardiology OR cardiovascular OR heart OR cardiac) AND TS = (Artificial intelligence OR AI OR computational intelligence OR machine intelligence OR computer reasoning OR computer vision system OR knowledge acquisition OR knowledge representation). ...
... Some limitations must be acknowledged. First, despite the fact that Web of Science Core Collection has been rated as the most trustworthy database for bibliometric studies [19][20][21], it may add some source of bias to the current findings of this bibliometric study owing to the fact that PubMed, Embase, and Scopus databases are also available for scientific literature. In addition, other types of publications such as letters, comments and conference abstracts were excluded from this study, and this exclusion may have resulted in the omission of some hotspots. ...
... The majority of the relevant publications in our analysis were published in nations such as the USA, China, Germany and England. Bibliometric research in other disciplines, such as intensive care medicine [28], cancers [29] and neurology [30], have shown similar tendencies. The financial standing of a country has a significant impact on academic competence [31]. ...
Artificial intelligence (AI) applications on rheumatoid arthritis (RA) are becoming increasingly popular. In this bibliometric study, we aimed to analyze the characteristics of publications relevant to the research of AI in RA, thereby developing a thorough overview of this research topic. Web of Science was used to retrieve publications on the application of AI in RA from 2003 to 2022. Bibliometric analysis and visualization were performed using Microsoft Excel (2019), R software (4.2.2) and VOSviewer (1.6.18). The overall distribution of yearly outputs, leading countries, top institutions and authors, active journals, co-cited references and keywords were analyzed. A total of 859 relevant articles were identified in the Web of Science with an increasing trend. USA and China were the leading countries in this field, accounting for 71.59% of publications in total. Harvard University was the most influential institution. Arthritis Research & Therapy was the most active journal. Primary topics in this field focused on estimating the risk of developing RA, diagnosing RA using sensor, clinical, imaging and omics data, identifying the phenotype of RA patients using electronic health records, predicting treatment response, tracking the progression of the disease and predicting prognosis and developing new drugs. Machine learning and deep learning algorithms were the recent research hotspots and trends in this field. AI has potential applications in various fields of RA, including the risk assessment, screening, early diagnosis, monitoring, prognosis determination, achieving optimal therapeutic outcomes and new drug development for RA patients. Incorporating machine learning and deep learning algorithms into real-world clinical practice will be a future research hotspot and trend for AI in RA. Extensive collaboration to improve model maturity and robustness will be a critical step in the advancement of AI in healthcare.
... In order to better grasp the development status and hotspots of digital technology in the field of emergency management of public health emergencies, this paper selects the Science Citation Index Expanded (SCI-E) and Social Science Citation Index (SSCI) databases in the core database of Web of Science (WOS) as the source of literature search data. This database has the characteristics of authority and massive data, and the Web of Science database is more suitable for building knowledge graphs than other databases (32,33). The time frame of this paper is 2003-2022. ...
Background
The frequent occurrence of major public health emergencies globally poses a threat to people's life, health, and safety, and the convergence development of digital technology is very effective and necessary to cope with the outbreak and transmission control of public epidemics such as COVID-19, which is essential to improve the emergency management capability of global public health emergencies.
Methods
The published literatures in the Web of Science Core Collection database from 2003 to 2022 were utilized to analyze the contribution and collaboration of the authors, institutions, and countries, keyword co-occurrence analysis, and research frontier identification using the CiteSpace, VOSviewer, and COOC software.
Results
The results are shown as follows: (1) Relevant research can be divided into growth and development period and rapid development period, and the total publications show exponential growth, among which the USA, China, and the United Kingdom are the most occupied countries, but the global authorship cooperation is not close; (2) clustering analysis of high-frequency keyword, all kinds of digital technologies are utilized, ranging from artificial intelligence (AI)-driven machine learning (ML) or deep learning (DL), and focused application big data analytics and blockchain technology enabled the internet of things (IoT) to identify, and diagnose major unexpected public diseases are hot spots for future research; (3) Research frontier identification indicates that data analysis in social media is a frontier issue that must continue to be focused on to advance digital and smart governance of public health events.
Conclusion
This bibliometric study provides unique insights into the role of digital technologies in the emergency management of public health. It provides research guidance for smart emergency management of global public health emergencies.
... However, due to emergence of analysis tools like bibliometrix via Biblioshiny (Aria and Cuccurullo 2017), CiteSpace (Chen 2006;Chen et al. 2010), CitNetExplorer (van Eck and Waltman 2014), SciMAT (Cobo et al. 2012), Pajek (Batagelj and Mrvar 2004;Mrvar and Batagelj 2016), and VOSviewer (van Eck and Waltman 2010), bibliometric analysis is also used for specialized tasks. These include document-citations and co-author network visualization (Kumar and Goel 2021), cluster analysis (Akbari et al. 2020), keyword co-occurrence network analysis (Zhang et al. 2017b), and analysis of collaboration between countries and affiliations (Ranjbari et al. 2021), and theme evolution (Liu et al. 2021). In summary, bibliometric analysis can be inferred as an efficient tool to summarize the trends in the research field over past decade and draw future directions (Zhang et al. 2017a;Zare et al. 2017;Kumar and Goel 2021;Liu et al. 2021). ...
... These include document-citations and co-author network visualization (Kumar and Goel 2021), cluster analysis (Akbari et al. 2020), keyword co-occurrence network analysis (Zhang et al. 2017b), and analysis of collaboration between countries and affiliations (Ranjbari et al. 2021), and theme evolution (Liu et al. 2021). In summary, bibliometric analysis can be inferred as an efficient tool to summarize the trends in the research field over past decade and draw future directions (Zhang et al. 2017a;Zare et al. 2017;Kumar and Goel 2021;Liu et al. 2021). ...
... The keywords in the published article represent the high-level summary of whole text of the article and reflect the core theme of a particular study (Zare et al. 2017;Liu et al. 2021). In this study, a 25-node word tree diagram is constructed using "Author's Keywords" search criteria as shown in Fig. 5. ...
Contaminant transport modeling (CTM) in the groundwater represents the complex bio-geo-chemical processes in the sub-surface system and plays a vital role in designing remediation strategies for contaminated sites. Hence, this study evaluated 1955 articles on CTM-based studies published from 2010 to 2022 by utilizing the Scopus® database to provide a quantitative analysis of current trends and future directions. A systematic approach comprised of a bibliometric survey and visualization of various networks was conducted with the VOSviewer and Biblioshiny software for quantitative analysis of progress of CTM research field over the past decade. The hotspots and evolution of themes of CTM were found using Sankey diagrams, and thematic maps. It was observed that articles were published at an exponential rate over past 5 years. The analysis of Scopus® database revealed that the average citations per article and the average citations per year per article were 14.7 and 2.225. In the past decade, USA published 489 articles and emerged as the leading country based on mutual collaborations and cooperation with other top 9 most productive countries. Flinders University was ranked in the first position based on the number of articles, followed by Pacific Northwest National Laboratory. The findings obtained from this study can help researchers identify exploitation and core areas, to understand better the direction of research of mathematical model development , and to determine hotspots of CTM research field.
... Strategic critical metals, defined as metallic elements critical to the national economy and security, mainly include rare metals, rare earth metals, and scattered metals, and have attracted unprecedented attention from many countries in recent years [1][2][3]. These elements play vital roles in emerging industries, such as new energy, new materials, digital technologies, clean technologies, and aerospace technologies [4][5][6]. ...
... Especially, Li is mainly used for the manufacture of lithium batteries, and Ga is an important raw material for semiconductors. The government of Japan established the Rare Metals Security Strategy list containing 31 metals in 2009 [2]. Subsequently, the United States and the European Union proposed similar strategies to deal with potential supply risks of critical metals. ...
Critical metallic elements in coal gangue have great utilization potential, especially due to the current shortage of these metals. This paper focused on examining the feasibility of physical separation (screening and float-sink tests) and calcination treatment for the enrichment of critical elements (Li, Ga, and rare earth elements plus yttrium (REY)) from coal gangue. The impacts of these enrichment methods on the acid leaching recovery of these elements were then studied. Screening tests indicated that Li and Ga were enriched in >0.125 mm size fraction and the content of REY was highest in <75 μm size fraction. Float-sink tests showed that high-density fractions were enriched in Li and Ga, and low-density fractions were enriched in REY. Physical separation cannot significantly improve the leaching rate of Li, Ga, and REY. Notably, Li, Ga, and REY were enriched significantly, and their acid leaching recoveries were increased by 54~68% after calcination under 400 °C. Sequential chemical extraction tests showed that the majority of insoluble Li, Ga, and REY was converted into soluble forms at the above temperature, which is attributed to the formation of amorphous metakaolinite and the decomposition of organic matter. Based on the results, a conceptually combined flowsheet was proposed for the extraction of Li and Ga from coal gangue.
Strategic mineral resources are the indispensable material basis for the national economy. However, with the improvement of industrialization, the demand for strategic mineral resources increases dramatically. The limited resources have caused countries to attach a new level of importance to the recycling of strategic mineral resources. Meanwhile, there has been an unprecedented increase in research on the recycling of key mineral resources in recent years. In this study, bibliometric and visualization analyses of publication data in strategic mineral resources recycling from 1995 to 2022 were conducted to reveal the development and evolution of this field and the current research hot issues. The results of the study show that the number of published literature on strategic mineral resource recycling has fluctuated year by year since 2013 and significantly increased after 2021. In terms of national publications, China, Japan, the United States (U.S.), and the European Union (EU) have conducted more research on crucial resource recycling. Especially since the 2020 United Nations General Assembly, when China's goal of "carbon peaking and carbon neutrality" was put forward, China's publications concerning critical metal recycling in the three years thereafter were twice as many as those in the previous 25 years. Regarding authorship and citations, Xu Zhenming’s team from China has a greater impact in this particular field. In addition, keyword analysis reveals that “recycling potential,” “adsorption,” and “Li” are the research frontiers and hotspots of strategic mineral resource recycling. “Recovery,” “precious metal,” and “separation” frequently appear, which are the most popular research topics. This study provides a theoretical basis for scholars to know full well about the dynamics of strategic mineral resource recycling, explore its future research direction, and realize the sustainable development of Strategic mineral resources.
Erosion and sedimentation in streams, lakes, reservoirs, and watersheds are a global issue. Runoff and flood waves erode soil and streambank material, destroying agricultural land. Erosion and sedimentation in water bodies induce soil loss in the watershed and diminish channel flow depth and conveyance. Agricultural runoff can pollute aquatic ecosystems by carrying sediment. As per IPCC 2019 report, in tropical and subtropical regions, the impacts of soil erosion can be observed from the high rates of soil loss, in some cases exceeding 100 t/ha/yr. Therefore, it becomes necessary to address the problem of erosion and sedimentation with serious concern. This paper focuses on highlighting the research advancements in the field of erosion and sedimentation phenomenon, estimation of erosion and sedimentation rate in watersheds, streams and reservoirs and resulting impact assessment from reach scale to watershed scale in last five decades and assessing further research scope in this regard. A bibliometric analysis considering 1000 research articles database extracted from the Web of science has been conducted in the Biblioshiny platform using the R-programming tool. The Bibliometric analysis shows an annual scientific production growth of 2.27% in the field of erosion and sedimentation. Most of the articles have been published in the USA, followed by China, UK, and Belgium. This is the first such bibliometric analysis of erosion and sedimentation together considering one thousand articles associated with it. The study can help in observing the publication trend and identifying the recent emerging topics for research in the field of erosion and sedimentation.
Carbon dioxide capture, utilization, and storage (CCUS) technology is an emerging technology with large-scale emission reduction potential and an essential component of the global response to climate change to achieve net-zero goals. As the two most important countries in global climate governance, it is necessary to review and examine the current status and trends of research in the field of CCUS in China and the USA. This paper uses bibliometric tools to review and analyze peer-reviewed articles in the Web of Science from both countries during 2000–2022. The results show a significant increase in research interest among scholars from both countries. The number of publications in the CCUS field in China and the USA was 1196 and 1302, respectively, showing an increasing trend. China and the USA have become the most influential countries in CCUS. And the USA has a more significant academic influence on a global scale. Furthermore, the research hotspots in the field of CCUS are diverse and differentiated. That is, China and the USA pay attention to different research hotspots or have different focuses in different periods. This paper also finds that new capture materials and technology development, geological storage monitoring and early warning, CO2 utilization and new energy development, sustainable business models, incentive policies and measures, and public awareness are critical directions for future research in the field of CCUS, to provide a comprehensive review and comparison of CCUS technology development in China and the USA. It helps to gain insight into the research differences and linkages between the two countries in the field of CCUS and identify the research gaps between them. And place some consensus that policymakers can use.
Biochar (BC) has been paid responsiveness during current decades. The present study, BC with chromium, aimed to investigate the research status and future developments. To do so, from the Scopus database, 855 documents regarding BC with chromium were acquired during the study period from 2011 to 2022 and a bibliometric analysis was implemented. Chemosphere was the topmost journal in which most of the papers were published. China is categorized first followed by India and the USA in the publications. With 42 articles, Xinde Cao from China is the topmost author in this research area. China established collaboration with South Korea and the USA. Most influencing authors, journals, papers, and organizations were deliberated in addition to the investigation of keywords. Furthermore, the impact of chromium on soil, plants, and human beings was elaborated followed by the de-pollution mechanism (surface adsorption/reduction, ion exchange method, electrochemical interaction, surface complexation). Its removal efficiency was associated with the effect of adsorbent, pyrolysis temperature, dose, surface area, and pH. The renewal of sorbed BC was elaborated. Current research status and present problems of its elimination in the polluted environment were added. This contributes a lot of ideas to the contemporary research community who are employed in the field of chromium elimination in contaminated environments.
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