1,720,987 research outputs found
Advancements in Agricultural Sustainability Through Precision Farming and Wastewater Reuse: a Comprehensive Study on Intelligent Resource Management in Rural Development”
Full text linkPrecision nitrogen management in rainfed durum wheat cultivation: exploring synergies and trade-offs via energy analysis, life cycle assessment, and monetization
No full textFertilization with variable rate technology (VRT) is a pivotal technique of precision agriculture proposed for eco-friendly farming practices. Yet the magnitude of environmental benefts is often not well known or is highly variable. This study used a multi-indicator model and life cycle-based indicators to compare the performance of rain-fed durum wheat production using uniform (UA) and variable N fertilization (VRT). Two functional units were used: 1 ha of cultivated wheat and 1 ton of wheat produced. The energy analysis indicated that VRT increases energy use efciency and productivity by 13.3%, reduces specifc energy and total energy input by 11.7%, and increases net energy gain by 15.3%. The life cycle assessment (LCA) analysis indicated that for some environmental impacts, VRT had minor negative efects due to the comparable yield performance with UA. Yet, the VRT had a noteworthy positive impact on global warming, fne particulate matter formation, stratospheric ozone depletion, terrestrial acidifcation, and marine eutrophication, generating a fnal environmental beneft of 12.2% for 1 ton of product and 13.3% for 1 ha of land. Economic valuation or monetization of LCA results using monetization weighting factors indicated indirect economic benefts of VRT can be up to 6.6% for 1 ton of product and 7.7% for 1 ha of land. Our fndings support the use of nitrogen fertilization with VRT for sustainable extensifcation and improved eco-efciency of wheat production in a Mediterranean context. As a result of our research, we conclude that future case studies on annual crops with moderate land requirements should employ multiple metrics and functional units, as well as the concepts of monetization and life cycle assessment, to investigate trade-ofs between yield, economic, and environmental benefts and to aid decision-making about the true sustainability of proposed farming technologies
Effetto dell’epoca di trapianto e del livello di azoto sulle caratteristiche morfologiche e produttive della cardogna comune (Scolymus hispanicus L.).
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Morphological traits, yield, antioxidant activity and essential oil composition of oregano as affected by biostimulant foliar applications
No full textBiostimulants are interesting products which can promote the plant growth and improve its qualitative traits. In
this research, the effects of foliar applications of four biostimulants on oregano (Origanum vulgare L.) crop have
been investigated by evaluating morphological parameters, fresh and dry yield, antioxidant activity, total
phenolic content, and chemical composition of essential oil. The highest plant height (78 cm), inflorescence
height (22.2 cm), inflorescences+leaves dry yield (0.5 t ha− 1), dry matter yield (38.3 %) and essential oil yield
(3.4 %) were obtained in plants treated with biostimulant BlueN®, composted of Methylobacterium symbioticum
SB23. Plants treated with Acadian MPE®, containing vitamins, amino acids and proteins, and betaines, showed
the highest total phenolic content (60.3 GAE mg mL− 1). The combination of 21 traits with principal component
analysis (PCA) allowed to discriminate the biostimulant Biostimol Plus plus Peptamin-V Plus®, based on Ascophyllum nodosum extract and other elements as nitrogen, carbon, manganese, zinc and iron chelates, in a
correlated way with p-cymene, α-thujene, α-terpinene, β-myrcene contents, showing values signifcantly higher.
The heat-map identifed two main clusters where the treatments with biostimulants were clearly separated from
the control. Biostimulant treatments influenced the chemical composition of essential oil by increasing the
number of components, monoterpene hydrocarbons and sesquiterpene hydrocarbons contents. Therefore, biostimulants can play an important role with a view to sustainable oregano cultivation by representing a safe
source of nitrogen and especially for organic farming
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