1,721,015 research outputs found
Irroratrici sempre più efficienti e a minore impatto ambientale
No full textI costruttori di irroratrici sono impegnati a individuare soluzioni in grado di aumentare la quantità di agrofarmaco che raggiunge il bersaglio, limitando al contempo le perdite per deriv
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
Confronti preliminari tra differenti layout di un sistema a punto fisso per l’applicazione dei prodotti fitosanitari in vigneto
No full textIl sistema a punto fisso (Fixed Spray Delivery System – FSDS) per la distribuzione di prodotti fitosanitari (PF) è di crescente interesse in viticoltura e frutticoltura. Il FSDS deriva da una modifica di un impianto di irrigazione sovrachioma, e le sue componenti principali sono una stazione di pompaggio e un sistema di distribuzione. Quest'ultimo è costituito da linee di adduzione, che corrono lungo i filari, e da erogatori posti in chioma al fine di distribuire in modo uniforme la miscela fitoiatrica. La posizione e tipo di erogatori sono elementi cruciali per la distribuzione ottimale dei PF. Al fine di confrontarne la qualità della distribuzione in vigneto di un FSDS, da precedenti studi sono stati identificati quattro layout (L1, L2, L3 e L4). L'analisi dei risultati ha rivelato differenze significative tra i layout valutati sia per i depositi in chioma che per le perdite a terra. Il layout L1 ha evidenziato i depositi più alti, seguito da L3, L2 e L4. Le perdite a terra sono risultate maggiori per le configurazioni L3 e L1 (oltre 5,00 μL/cm), minori per L4 e L2 (meno di 4,00 μL/cm). In generale, layout con alte densità di installazione degli erogatori (L2, L4) dovrebbero favorire l'ottenimento di elevati depositi di miscela in chioma, ma nel caso del FSDS idraulico esaminato, il risultato è stato esattamente opposto. In conclusione, densità di installazione degli erogatori e disposizione degli stessi (layout) risultano cruciali per la distribuzione efficace di PF con un FSDS.The fixed spray delivery system (FSDS), a pesticide application technique based on a modified irrigation system, is raising interest among farmers for spray applications in vineyards and orchards. The hydraulic-based FSDS main components are a pumping station and a distribution system. The distribution system is composed of pipelines, and emitters installed in the canopy in a specific layout. Thus, FSDS layout, and emitter type, are of primary importance to uniformly deliver the spray mixture. Thanks to previous research four FSDS layouts (L1, L2, L3 e L4) were identified, and field tested to compare their spray performance. The dataset analysis showed a statistically significant effect of layout on mean deposition and ground losses. Layout L1 showed higher deposits, followed by L3, L2 e L4. Regarding ground losses, higher values were recorded for L3 e L1(> 5.00 μL/cm), and lower values for L4 e L2 (< 4.00 μL/cm). In general, layouts with a higher emitter density (L2, L4) should promote depositions on the target, but in this case resulted in lower canopy deposits. In conclusion, emitter density and layout are key factors affecting the spray performance of a hydraulic-based FSDS
Preliminary evaluation of irrigator emitters for pesticide application through solid set canopy delivering system in apple orchard and vineyard
No full textRecently, valuable alternatives to conventional pesticide application equipment are under investigation in 3D crops for improving pesticide spray application efficiency. Customized solid set canopy delivery systems (SSCDSs), tested in apple orchard and vineyard showed potential to reduce plant protection products (PPPs) spray drift while guaranteeing adequate spray deposition on the target and biological efficacy. Based on these premises, this study evaluated the feasibility to use a flat fan pulsed emitter (StripNet® - Netafim), usually installed in orchard and vineyard for irrigation and frost/heat-stress damage mitigation purposes, also to perform PPP spray applications. Laboratory tests were made to characterize the emitter flow rate at different pressures and the droplet size spectra generated. Semi-field trials were then carried out to measure StripNet® spray coverage in semi-pedestrian trained trellised apple orchard and Guyot espalier trained trellised vineyard. The performance of StripNet® flat fan emitter was evaluated comparing the spray coverage obtained with the one achieved using conventional sprayers equipped with spray drift reducing technology (SDRT), both in apple orchard and vineyard. StripNet® emitter was characterized by a VMD value of 453.1 μm and 4.60% of V100 indicating potential in reducing spray drift. Semi-field trials indicated differences between crops in terms of spray coverage attributable to the canopy shape and density, with higher homogeneity at all canopy height and depth in apple orchard case. In vineyard, a high spray coverage was observed on the top of the canopy, while lower values were registered in the medium and lower parts of the rows, thus affecting the overall uniformity of spray distribution. The use of StripNet® for PPPs application from the top of the canopy resulted therefore a feasible option in apple orchard, while for vineyard further studies are necessary to define the type of emitter and its position into the canopy able to guarantee the necessary uniformity of the deposition along the canopy structure
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
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