Browsing by Subject "Research trends"

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    Production of biodiesel under supercritical conditions: State of the art and bibliometric analysis
    (Elsevier, 2020) Andreo Martínez, Pedro; Ortiz Martínez, Víctor Manuel; García Martínez, Nuria; Pérez de los Ríos, Antonia; Hernández Fernández, Francisco José; Quesada Medina, Joaquín; Química Agrícola, Geología y Edafología
    The demand for biodiesel as an alternative and potentially renewable fuel is constantly rising. Biodiesel production from lipids in supercritical conditions offers several advantages over other catalytic processes. These advantages include high-efficiency production, environmental friendliness and the possibility of using a broad range of feedstock sources. As a consequence, there is a great interest in biodiesel production research using supercritical fluids as a sustainable technology option. In this sense, bibliometric reviews can be very useful for the interpretation of scientific production and research trends in this field. Thus, this work presents a scientometric study on biodiesel production research under supercritical conditions from 2001 to 2019, based on the Web of Science© database. 608 articles were analyzed and the parameters considered were: (i) publication type, language and output characteristics, (ii) Lotka's Law, Price's index and h-index, (iii) authors, countries and institutions collaboration analysis, (iv) publication performance by authors, journals, institutions and countries and (v) author keywords, single title words and keywords Plus analysis. The productivity patterns of authors, journals, institutions and authors keywords were found to fit Lotka's law. In terms of feedstock used in supercritical conditions, the bibliometric analysis showed a clear transition from first- to third-generation biodiesel, with special attention paid to the experimental study of supercritical reaction conditions. By contrast, further process optimization, the reduction of the severity of the supercritical conditions through devised strategies to lower energy consumption and further economic analysis are still needed, among other factors, for the real implementation of the technology.
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    Research trends in physical activity and breast cancer: a 25-year bibliometric analysis (2000–2025) using the bibliometrix R package
    (2026-01-06) Navarro Martínez, Carlos; Villarejo García, Diego; Becerra Patiño, Boryi Alexander; Pino Ortega, José; Actividad Física y Deporte; Facultad de Ciencias del Deporte
    Introduction: Research on physical activity and breast cancer has grown steadily over the past 25 years, with a progressive shift from physiological and safety-related questions towards clinical, psychosocial and implementation domains. Objective: To describe research trends, key actors and thematic foci in the scientific literature on physical activity and breast cancer between 2000 and 2025. Methods: We included articles and reviews without language restrictions, published between 2000 and 2025 and indexed in Scopus, PubMed and Web of Science. Records were exported in CSV format and analysed using the Bibliometrix package in R. We described publication and citation volume, collaboration patterns (countries, institutions and authors), core journals according to Bradford’s law, and the semantic evolution of the field based on keyword co-occurrence and trend topics. Results: We identified 13,329 documents on physical activity and breast cancer, with a sustained increase in both publications and citations over the study period. A marked geographical concentration was observed, with leadership by high-income, mainly Anglophone countries and a limited number of specialised editorial cores, as well as a small group of highly influential authors. The thematic analysis showed a shift from studies focused on functional capacity and safety towards clinical practice guidelines, survivorship and quality of life, alongside emerging lines such as prehabilitation, remote interventions and tele-exercise. Conclusions: The field of physical activity and breast cancer shows a high and growing scientific output with a clear clinical orientation. Integrating exercise prescription into oncological care pathways, defining and standardising dose–response schemes according to tumour phenotype and clinical context, and expanding multicentre studies that include under-represented regions and populations—particularly in low- and middle-income countries—are recommended priorities for future research and practice.