RESEARCH ARTICLE Large-scale identification and characterization of scholars on Twitter Rodrigo Costas1,2 , Philippe Mongeon1,3 , Márcia R. Ferreira1,4,5 , Jeroen van Honk1 , and Thomas Franssen1 1Centre for Science and Technology Studies (CWTS), Universidad de Leiden, Leiden (Los países bajos) 2Centre for Research on Evaluation, Science and Technology (CREST), Stellenbosch University, Stellenbosch (South Africa) 3Centre for Studies in Research and Research Policy (CFA), Aarhus University, Aarhus

RESEARCH ARTICLE National policies as drivers of organizational change in universities: A string of reinforcing reforms a n o p e n a c c e s s j o u r n a l Danish Centre for Studies in Research & Política de investigación, Department of Political Science & Government, Aarhus University, Bartholins Allé 7, DK-8000 Aarhus C, Denmark Andreas Kjær Stage and Kaare Aagaard

RESEARCH ARTICLE How much research shared on Facebook happens outside of public pages and groups? A comparison of public and private online activity around PLOS ONE papers a n o p e n a c c e s s j o u r n a l Asura Enkhbayar1 , Stefanie Haustein1,2,3 , Germana Barata4 , and Juan Pablo Alperin1,5 1Scholarly Communications Lab, Simon Fraser University,

RESEARCH ARTICLE The relationship between bioRxiv preprints, citations and altmetrics a n o p e n a c c e s s j o u r n a l Nicholas Fraser1 , Fakhri Momeni2 , Philipp Mayr2 , and Isabella Peters1,3 1ZBW—Leibniz Information Centre for Economics, Kiel, Germany 2GESIS—Leibniz Institute for the Social Sciences, Cologne, Germany 3Kiel University, Kiel, Germany Keywords: altmetrics, bioRxiv, citation advantage,

RESEARCH ARTICLE Google Books, Scopus, Microsoft Academic, and Mendeley for impact assessment of doctoral dissertations: A multidisciplinary analysis of the UK a n o p e n a c c e s s j o u r n a l Kayvan Kousha and Mike Thelwall Statistical Cybermetrics Research Group, School of Mathematics and Computer Science, University of Wolverhampton, Wulfruna Street, Wolverhampton WV1 1LY, UK Keywords:

RESEARCH ARTICLE The relationship between journal citation impact and citation sentiment: A study of 32 million citances in PubMed Central a n o p e n a c c e s s j o u r n a l College of Computing and Informatics, Drexel University, 3675 Market Street, Filadelfia, Pensilvania 19104 Erjia Yan , Zheng Chen, and Kai Li Citation: yan, MI., Chen, Z.,

RESEARCH ARTICLE Might Europe one day again be a global scientific powerhouse? Analysis of ERC publications suggests it will not be possible without changes in research policy a n o p e n a c c e s s j o u r n a l Alonso Rodríguez-Navarro1,2 and Ricardo Brito1 1Departamento de Estructura de la Materia, Física Térmica y Electrónica y GISC, Universidad Complutense

RESEARCH ARTICLE Gender differences in citation impact for 27 fields and six English-speaking countries 1996–2014 Mike Thelwall Statistical Cybermetrics Research Group, University of Wolverhampton, UK a n o p e n a c c e s s j o u r n a l Keywords: academic careers, citation impact, field differences, gender differences, research evaluation Citation: Thelwall, METRO. (2020). Gender differences in citation impact for

RESEARCH ARTICLE Impact factor volatility due to a single paper: A comprehensive analysis Manolis Antonoyiannakis1,2 1Department of Applied Physics & Applied Mathematics, Columbia University, 500 W.. 120th St., Mudd 200, Nueva York, Nueva York 10027 2American Physical Society, Editorial Office, 1 Research Road, Ridge, Nueva York 11961-2701 Palabras clave: bibliostatistics, citation distributions, impact factor, science of science, volatility ABSTRACT We study how a single paper affects the impact

RESEARCH ARTICLE Who are the acknowledgees? An analysis of gender and academic status Adèle Paul-Hus1,2 , Philippe Mongeon3 , Maxime Sainte-Marie3 , and Vincent Larivière1,4 1École de bibliothéconomie et des sciences de l’information, Université de Montréal, PO Box 6128, Downtown Station, Montréal, Québec, H3C 3J7, Canada 2Centre Interuniversitaire de Recherche sur la Science et la Technologie (CIRST), CP 8888, Succ. Centre-Ville, H3C 3P8 Montréal, Qc.,

RESEARCH ARTICLE A principled methodology for comparing relatedness measures for clustering publications a n o p e n a c c e s s j o u r n a l Ludo Waltman1 , Kevin W. Boyack2 , Giovanni Colavizza3 , and Nees Jan van Eck1 1Centre for Science and Technology Studies, Universidad de Leiden, The Netherlands 2SciTech Strategies, Cª, Albuquerque, NM, USA 3University of Amsterdam,

RESEARCH ARTICLE Connected from the outside: The role of U.S. regions in promoting the integration of the European research system a n o p e n a c c e s s j o u r n a l Emanuele Rabosio1 , Lorenzo Righetto1 , Alessandro Spelta2 , and Fabio Pammolli1,3 1Human Technopole, Center for Analysis, Decisions and Society, Milano, Italy 2Università di Pavia, Dipartimento

RESEARCH ARTICLE Methodological considerations for identifying questionable publishing in a national context: The case of Swedish Higher Education Institutions Gustaf Nelhans1,2 and Theo Bodin3 1University of Borås, Sweden 2University of Southern Denmark, Denmark 3Karolinska Institutet, Sweden Keywords: national level, publication blacklists, publication ethics, questionable publishing ABSTRACT The overall scope of this study is an attempt at a methodological framework for matching publication lists at the

RESEARCH ARTICLE Can altmetrics reflect societal impact considerations?: Exploring the potential of altmetrics in the context of a sustainability science research center a n o p e n a c c e s s j o u r n a l Omar Kassab1, Lutz Bornmann2 , and Robin Haunschild3 1Swiss Federal Institute of Technology (ETH Zurich), Professorship for Social Psychology and Research on Higher Education,

RESEARCH ARTICLE Comparison of bibliographic data sources: Implications for the robustness of university rankings a n o p e n a c c e s s j o u r n a l Chun-Kai (Karl) Huang , Cameron Neylon , Chloe Brookes-Kenworthy , Richard Hosking , Lucy Montgomery , Katie Wilson , and Alkim Ozaygen Centre for Culture and Technology, Curtin University, Bentley 6102, Western

RESEARCH ARTICLE Recommending research articles to consumers of online vaccination information Eliza Harrison1 , Paige Martin1 , Didi Surian1 , and Adam G. Dunn1,2 1Centre for Health Informatics, Australian Institute of Health Innovation, Macquarie University, Sídney, Australia 2Discipline of Biomedical Informatics and Digital Health, School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, Sídney, Australia Keywords: information retrieval, news media, investigación

RESEARCH ARTICLE Citation concept analysis (CCA) of Robert K. Merton’s book Social Theory and Social Structure: How often are certain concepts from the book cited in subsequent publications? a n o p e n a c c e s s j o u r n a l Charles Crothers1 , Lutz Bornmann2 , and Robin Haunschild3 1School of Social Sciences, Auckland University of Technology, Nuevo

RESEARCH ARTICLE Transfer of knowledge through international scientific mobility: Introduction of a network-based bibliometric approach to study different knowledge types a n o p e n a c c e s s j o u r n a l Valeria Aman German Centre for Higher Education Research and Science Studies (DZHW ), Berlina, Germany Citation: Aman, V. (2020). Transfer of knowledge through international scientific mobility: