Producción Científica

The emission of greenhouse gases emitted into the atmosphere by the burning of fossil fuels has allowed the development of biofuels such as biomethane. The aim of this research was to explore the characteristics of biomethane literature from 1978 to 2020 based on the database of Scopus and its implications using indicators bibliometrics. The information in the database was analyzed through the Gompertz model to determine the specific growth rate over the years. Also, maps were elaborated with the VOSviewer software to show in a visual way the collaboration between authors and keywords related to the topic of study. Documents were examined in a variety of aspects of the publication characteristics such as document type, language, authorship, countries, institutions, journals, high-cited papers. Results showed that the evolution of publications grew exponentially from 2006 to 2020, the specific speed of growth determined with the Gompertz model was 0.4 0.095 years-1 (R2>0.99). 52% of publications are concentrated in five countries (Italy, India, China, the United States and Spain). Bioresource Technology is the journal with the highest number of publications and citations, the authors publish in quartile 1 and 2 journals. The biomethane topic has a growing number of publications and citations due to the collaboration between researchers from different countries. The present work can be contrasted with the analysis of bibliographic indicators with other databases to determine the level of collaboration with other journals with different index.

Climate change (CC) is one of the greatest threats to human health, safety, and the environment. Given its current and future impacts, numerous studies have employed computational tools (e.g., machine learning, ML) to understand, mitigate, and adapt to CC. Therefore, this paper seeks to comprehensively analyze the research/publications landscape on the MLCC research based on published documents from Scopus. The high productivity and research impact of MLCC has produced highly cited works categorized as science, technology, and engineering to the arts, humanities, and social sciences. The most prolific author is Shamsuddin Shahid (based at Universiti Teknologi Malaysia), whereas the Chinese Academy of Sciences is the most productive affiliation on MLCC research. The most influential countries are the United States and China, which is attributed to the funding activities of the National Science Foundation and the National Natural Science Foundation of China (NSFC), respectively. Collaboration through co-authorship in high-impact journals such as Remote Sensing was also identified as an important factor in the high rate of productivity among the most active stakeholders researching MLCC topics worldwide. Keyword co-occurrence analysis identified four major research hotspots/themes on MLCC research that describe the ML techniques, potential risky sectors, remote sensing, and sustainable development dynamics of CC. In conclusion, the paper finds that MLCC research has a significant socio-economic, environmental, and research impact, which points to increased discoveries, publications, and citations in the near future.

Biochar is a carbonized material obtained from the pyrolysis of biomass produced in a limiting environment of zero or very low oxygen. Its interest lies in its versatility for different applications in the water treatment, soil pollution, mitigation of greenhouse gases, etc. The synergy of this product with other amendments such as compost has been studied for different applications in the soil, including environmental remediation, crop yield, etc. The aim of the research is to identify the relevant aspects in the scientific literature of biochar, compost and soil through a bibliometric analysis for which 753 articles were selected from the Scopus database, having as keywords “biochar”, “compost” and “soil”. This research used R software, specifically the package Bibliometrix, to analyze descriptive analysis, author sources, document metrics, citation, co-citation analysis, co-occurrence network, co-word analysis, and collaboration analysis. Results showed that Zhang Z is the author with the greatest number of documents, and with a higher H index. Science of The Total Environment, Bioresource Technology, and Agronomy are the 3 topmost relevant sources. The keywords according to bond strength and most frequent use were biochar (538 occurrences), composting (349 occurrences), compost (436 occurrences), charcoal (295 occurrences), soil (255 occurrences). China is the country with the most collaboration. It is hoped that the bibliometric review will help to identify current research trends and provide information on the application of biochar and compost in the soil.