1,721,177 research outputs found
Is anaerobic digestate from sewage sludge a potential solution for improvement of poor soils?
No full textSewage sludge is the principal waste coming from wastewater treatment and its production in Europe has rather increased in last twenty years. Nowadays, anaerobic digestion (AD) is the most diffused technique to stabilize SS and achieve energy recovery. Anaerobic digestate from sewage sludge (SSAD) is the principal by-product of this process. In the present work, one of the SSAD destinations (i.e. agricultural use) is reprised and challenged, evaluating the fertilizing effects of SSAD on a soil depleted of organic matter and plant nutrients. To this aim, four different SSADs (two liquid and two dewatered) were characterized and used to set up pot experiments with cucumber (Cucumis sativus L.), grown on two different substrates: a poor and sandy soil, and an organic substrate. SSADs and a mineral fertilizer were utilised at three different dosages: 85, 170, 255 kg of nitrogen per hectare (kg N/ha). Different plant parameters were measured such as germination, dry biomass, chlorophyll content index (CCI), net photosynthesis, stomatal conductance, CO2 concentration in substomatal cavity and root development. Results showed that the evaluated parameters were in general significantly similar or higher than untreated control. Moreover, the 170 kg N/ha dosage generally showed the best results compared to other dosages, especially for dewatered SSADs. All these results were much more evident for cucumber plants grown on sandy soil than on peat substrate, assessing the desired fertilizing effect on a poor soil
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
Anaerobic digestates from sewage sludge used as fertilizer on a poor alkaline sandy soil and on a peat substrate: Effects on tomato plants growth and on soil properties
Full text linkAnaerobic digestates from sewage sludge (SSADs) are a by-product of the wastewater treatment process that still
preserves a certain agronomic interest for its richness in plant nutrients and organic matter. Fertilizing properties
of two liquid and two dewatered SSADs were tested on tomato plants (Solanum lycopersicum L.). Pot experiments
were performed on sandy soil and peat substrate under greenhouse conditions with a SSADs application rate of
170 kg N/ha over a period of three months. Beneficial effects of SSADs were reported on different growth parameters,
revealing an increase in biomass and height up to 37.5 and 6-folds over untreated control. No
phytotoxic effect occurred on SSAD-exposed plants. Chemical analysis of soils treated with SSADs showed
enrichment of macro- and micro-nutrients as well as organic matter. In some cases, the chemical characterization
of leaves revealed an enhancement of uptaken macronutrients. This study contributed in general to deepen the
knowledge on the short-term growing season fertilizing effects of SSAD. Despite the treatment dosage was
calculated only on nitrogen requirements, the study highlighted the importance of the other nutrients and
organic matter on plant growth
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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