Large-Scale Analysis of the Accuracy of the Journal Classification Systems of Web of Science and Scopus

Journal classification systems play an important role in bibliometric analyses. The two most important bibliographic databases, Web of Science and Scopus, each provide a journal classification system. However, no study has systematically investigated the accuracy of these classification systems. To examine and compare the accuracy of journal classification systems, we define two criteria on the basis of direct citation relations between journals and categories. We use Criterion I to select journals that have weak connections with their assigned categories, and we use Criterion II to identify journals that are not assigned to categories with which they have strong connections. If a journal satisfies either of the two criteria, we conclude that its assignment to categories may be questionable. Accordingly, we identify all journals with questionable classifications in Web of Science and Scopus. Furthermore, we perform a more in-depth analysis for the field of Library and Information Science to assess whether our proposed criteria are appropriate and whether they yield meaningful results. It turns out that according to our citation-based criteria Web of Science performs significantly better than Scopus in terms of the accuracy of its journal classification system

Co-existence of Anaerobic Ammonium Oxidation Bacteria and Denitrifying Anaerobic Methane Oxidation Bacteria in Sewage Sludge: Community Diversity and Seasonal Dynamics

Anaerobic ammonium oxidation (ANAMMOX) and denitrifying anaerobic methane oxidation (DAMO) have been recently discovered as relevant processes in the carbon and nitrogen cycles of wastewater treatment plants. In this study, the seasonal dynamics of ANAMMOX and DAMO bacterial community structures and their abundance in sewage sludge collected from wastewater treatment plants were analysed. Results indicated that ANAMMOX and DAMO bacteria co-existed in sewage sludge in different seasons and their abundance was positively correlated (P < 0.05). The high abundance of ANAMMOX and DAMO bacteria in autumn and winter indicated that these seasons were the preferred time to favour the growth of ANAMMOX and DAMO bacteria. The community structure of ANNAMOX and DAMO bacteria could also shift with seasonal changes. The "Candidatus Brocadia" genus of ANAMMOX bacteria was mainly recovered in spring and summer, and an unknown cluster was primarily detected in autumn and winter. Similar patterns of seasonal variation in the community structure of DAMO bacteria were also observed. Group B was the dominant in spring and summer, whereas in autumn and winter, group A and group B presented almost the same proportion. The redundancy analysis revealed that pH and nitrate were the most significant factors affecting community structures of these two groups (P < 0.01). This study reported the diversity of ANAMMOX and DAMO in wastewater treatment plants that may be the basis for new nitrogen removal technologies

Desempeño científico argentino en cinco áreas prioritarias de I+D. Una mirada a través del SCImago Journal & Country Rank

En este artículo se analiza mediante indicadores bibliométricos la producción científica argentina del período 2001-2010 recogida en el SCImago Journal & Country Rank en cinco áreas prioritarias de I+D establecidas en el Plan Estratégico Nacional en Ciencia, Tecnología e Innovación "Bicentenario" (2006-2010). Se emplean indicadores cuantitativos y cualitativos relativos para dar cuenta del desempeño científico de la producción doméstica con respecto a América Latina y el Caribe y el resto del mundo. De las áreas temáticas seleccionadas, se detecta que el campo disciplinar Agricultural and Biological Sciences es el que muestra mayor crecimiento, actividad y visibilidad a nivel regional y mundial.This paper analyses the Argentine scientific production of period 2001-2010 collected from SCImago Journal & Country Rank in five priority areas for R&D set in the National Strategic Plan on Science, Technology and Innovation "Bicentennial" (2006-2010). Relative quantitative and qualitative indicators are used to account for scientific performance of domestic production regarding Latin America and the Caribbean, and the rest of the world. It was detected that the Agricultural and Biological Sciences discipline field is the one area that shows the fastest growth, activity and visibility at regional and global levels.Fil: Merlino-Santesteban, Cristian. Universidad Nacional de Mar del Plata. Facultad de Ciencias Económicas y Sociales; Argentina

Mendeley readership counts: An investigation of temporal and disciplinary differences

This is an accepted manuscript of an article published by Taylor and Francis in Journal of the Association for Information Science and Technology on 05/06/2015, available online: https://doi.org/10.1002/asi.23559 The accepted version of the publication may differ from the final published version