1,721,087 research outputs found
Challenges and opportunities of light-emitting diode (Led) as key to modulate antioxidant compounds in plants. a review
Full text linkPlant antioxidants are important compounds involved in plant defense, signaling, growth, and development. The quantity and quality of such compounds is genetically driven; nonetheless, light is one of the factors that strongly influence their synthesis and accumulation in plant tissues. Indeed, light quality affects the fitness of the plant, modulating its antioxidative profile, a key element to counteract the biotic and abiotic stresses. With this regard, light-emitting diodes (LEDs) are emerging as a powerful technology which allows the selection of specific wavelengths and intensities, and therefore the targeted accumulation of plant antioxidant compounds. Despite the unique advantages of such technology, LED application in the horticultural field is still at its early days and several aspects still need to be investigated. This review focused on the most recent outcomes of LED application to modulate the antioxidant compounds of plants, with particular regard to vitamin C, phenols, chlorophyll, carotenoids, and glucosinolates. Additionally, future challenges and opportunities in the use of LED technology in the growth and postharvest storage of fruits and vegetables were also addressed to give a comprehensive overview of the future applications and trends of research
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
Autonomous navigation simulation of an agricultural robot during soil fertilization in open fields
No full textThe involvement of robotic devices as drones, mobile robots and tractors can make agricultural operations more effective, faster, and more sustainable. This study reports the simulation in ROS environment of a four wheeled electrical robot useful for soil fertilization in open fields. The developed environment is represented by parallel rows of tomatoes and mobile obstacles. The robot manages to perform the task implementing the autonomous navigation using some waypoints saved in a warm-up lap
Vibration transmission analysis in monumental olive trees for precision pruning: the PULP system approach
No full textOlive growing traditional areas are characterized by monumental olive trees. Mechanical harvesting is also applied to these trees using branch shaking machines, but incorrect tree architecture reduces applied vibrations transmission. A new pruning model can improve mechanical harvesting efficiency by focusing on the study of vibration transmission in the tree. Therefore, the aim of this study was to evaluate the transmission of vibrations, to develop a model of precision pruning. The PULP system (pruning of unvibrating localized portions) records the transmission of vibrations through a series of accelerometers placed on branches of different orders. The experiment was carried out in a commercial olive orchard in Apulia. An evaluation in pruning and harvesting was carried out followed by the measurement of yield and harvesting efficiency. During pruning, the highest decrement in vibration transmission was from secondary (4.56×10-4 V) to tertiary branches (1.74×10-4 V). Similar values were observed during harvesting, but vibrations transmission inside seemed different. The detachment index showed no significant differences before and after harvesting, highlighting no influence of fruits position inside the canopy. The trees, on which was recorded a yield of 108±7.08 kg tree-1, in the first 12 s of shaking led to a harvesting efficiency of 80±3%. These preliminary data were necessary to better understand the vibration transmission and the different branches’ behaviour. Further studies are necessary in the coming years to improve and use this prototype to realize a precision pruning method for trees harvested with trunk shakers
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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