1,721,027 research outputs found
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
Phytosociology, preferences and floristic mapping of the most appreciate species by Apis mellifera and other Apoidea
No full textThe alteration of natural and rural landscapes of northern Italy, caused by the broad urbanization and the intensive use of agricultural lands, has led to a reduction in the nectariferous species with the depletion of the food resources available and necessary for the survival of the bees. The existence of architectural barriers determined by human settlements, and the reduction in cultivated areas of nesting sites for wild bee species often alters and obstacles bee movements in the areas in search of the food source. The impact of these factors is extremely variable in relation to the bee-species studied, Apis mellifera L. or other social or solitary bees. In the case of A. mellifera, numerous factors should be considered and they imply both the survival of the colony and the productive capacity in terms of honey produced. The analysis of the territory is therefore fundamental, supported by phytosociological studies, use of databases related to land use and apiaries position as a proxy indicator of territorial suitability for the creation of maps aimed at verifying the potential beekeeping of the territories surrounding the hives. It is evident how these maps, obtained with the support of Web & Mobile App and GIS, become a scientific tool for the study and design of environmental improvement interventions and for crop management in support of the honey bees. With regard to this last aspect, the results of some specific studies on nectariferous species, potentially introduced in association with other crops to support bees in times of difficulty, are reported. Furthermore, in the panorama of highly anthropic environments, botanical gardens and urban parks, rich in numerous species that alternate blossoming period to improve the aesthetic purpose, can be used as open-air laboratories for the study of the relationships among bee-species, environment, floral species, and flowering. Through the study of the flower-bee network, it is possible to identify the most suitable species to support both A. mellifera and/or other species of Apoidea, both generalists and specialists. It is also possible to deepen the relationships that correlate the flower traits to the different species of bee present considering the interaction between the morphology/bioethology of the bee and the botanical characteristics
Fitosociologia, preferenze e mappatura floristica delle specie più appetite da Apis Mellifera e da altri apoidei
No full textL’alterazione dei paesaggi naturali e rurali del nord Italia, determinata dall’estesa urbanizzazione e dall’uso intensivo del suolo agricolo, ha portato a una riduzione delle specie nettarifere presenti con conseguente impoverimento delle risorse alimentari necessarie per la sopravvivenza degli apoidei. Si aggiunga inoltre che l’esistenza di barriere architettoniche determinate dagli insediamenti umani, e la riduzione nelle aree coltivate di siti di nidificazione per le specie selvatiche, rende spesso difficili gli spostamenti alla ricerca della fonte alimentare considerata. L’impatto di questi fattori è estremamente variabile a seconda che si tratti di Apis mellifera L. o di altri apoidei solitari o sociali. Nel caso di A. mellifera entrano in gioco numerosi fattori che implicano sia la sopravvivenza della colonia, sia la capacità produttiva in termini di miele prodotto.
Risulta quindi fondamentale l’analisi del territorio, supportata da studi fitosociologici, dall’utilizzo di banche dati dell’uso del suolo e dalla posizione degli apiari come indicatore “proxy” di idoneità territoriale per la realizzazione di mappe di idoneità finalizzate a verificare la potenzialità apistica dei territori circostanti gli alveari. Si evidenzia come tali mappe, ottenute con il supporto di Web & Mobile App e GIS, possano diventare strumento scientifico per lo studio e la progettazione degli interventi di miglioramento ambientale e per la gestione colturale a sostengo dell’ape da miele. Relativamente a quest’ultimo aspetto, si riportano i risultati di alcuni studi specifici effettuati su specie mellifere, potenzialmente utilizzabili in consociazione con altre colture e che possano supportare le api nei momenti di maggiori difficoltà. Nel panorama di ambienti fortemente antropizzati, gli orti botanici e i parchi urbani, sempre ricchi di numerose specie che si alternano nella fioritura per ottimizzare lo scopo estetico, possono risultare laboratori a cielo aperto per lo studio delle relazioni tra ambiente, specie fiorale, epoca di fioritura e relazione con gli apoidei, sia allevati che selvatici. Attraverso lo studio del network fiori-api è possibile individuare le specie botaniche più idonee a supportare sia A. mellifera sia altre specie di apoidei, tanto generalisti che specialisti. È possibile inoltre approfondire le relazioni che correlano le forme fiorali alle diverse specie di api presenti considerando l’interazione tra la morfologia/bioetologia dell’ape e le caratteristiche botaniche
Two alien invasive acacias in Italy : Differences and similarities in their flowering and insect visitors
No full textIn Italy, alien acacias have been introduced for ornamental and reforestation purposes, and some species became invasive occupying patches of the Mediterranean landscape. On the Island of Elba (Central Italy), Acacia dealbata and A. pycnantha form dense stands at short distance, showing an impressive massive flowering at the end of the winter/early spring. Our aim was to investigate the behaviour of the two species in relation to the flowering features, from phenology to floral characteristics, and their replay to the observed flower visitors. Differences between the two species emerged on all the parameters considered. A. pycnantha peak of flowering occurred later than A. dealbata and showed larger flower heads (FHs), more flowers/head, stamens/flower and polyads. On A. dealbata, we recorded longer racemes and more FHs/raceme, determining a more flower-dense crown. Even if contacts with flower visitors were generally low on both species, A. dealbata showed a more heterogeneous visitor assemblage. Both acacias species interacted with local generalist pollinators, as bumblebees and honey bees. Flower handling and resource collection strategy by the honey bee indicate a long-term relationship between the bee and the acacias, with bees investing longer time on the larger A. pycnantha flower heads
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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