1,720,987 research outputs found
Il lago di Corree come museo biogeologico per la ricerca e la didattica
No full textIl CD allegato riporta i risultati ottenuti da una ricerca multidisciplinare svolta in collaborazione con il gruppo di ricerca A.N.I.S.N. (Associazione Nazionale Insegnanti Scienze Naturali) iniziata nel 2003, riguardante lo studio degli aspetti biologici e geologici del Lago di Corree, situato nel Comune di Marano Appio (Caserta).
Oltre le Finalità e le applicazioni didattiche nel CD è descritto il materiale originale prodotto: erbario delle piante, insettario, provette con i vari animali raccolti e i campioni di Rocce
Late glacial and Holocene history of Buxus sempervirens L. in Italy
No full textIn the course of the Holocene, plant species experienced changes in their area of distribution and population density in response to climate change, biotic processes and human activities. The combined use of modern and past distribution data provides a powerful tool for assessing the directions and the rates of the changes that took place. Buxus sempervirens L. (common box) is an evergreen angiosperm present in Italy with a scattered and fragmented distribution resulting from its persistence in the Peninsula through the last glacial maximum and the Holocene. Buxus experienced a progressive population growth in the course of the Holocene, with different modes and times from region to region, depending on the different densities of the starting nuclei of Buxus populations. Populations located at latitudes between 41°N and 43°N were already rather dense during the late glacial. Buxus increased in the course of the Holocene especially in N Italy, while it underwent a severe reduction in S Italy, to the point of disappearing from Sicily and Apulia. Our results demonstrate that the knowledge of Buxus history is especially important in the context of future plant distribution changes, providing a starting point for conservation action and sustainable management of biodiversity
A morphometric study of Armeria canescens aggr. (Plumbaginaceae) in the Italian Peninsula
No full textArmeria Willd. is a genus of diploid, self-incompatible plants with weak internal reproductive barriers, in which hybridisation and introgression play a fundamental role and are partly responsible for patterns of variation. One of the most critical groups in Italy comprises Armeria canescens (Host) Ebel and Armeriamajellensis Boiss., species living in grasslands and pastures of central and southern Apennines. The taxonomic status of A. majellensis is not clear: for some authors it must be considered as a species endemic to Italy, but according to others it must be included in A. canescens because of their poor morphological separation. With the aim of clarifying the real status of A. majellensis and its relationship with A. canescens, we performed a morphometric study using materials coming from field collections throughout their Italian distribution area, herbarium specimens and samples coming from the loci classici of the species. The morphometric multivariate analyses showed that there are no significant differences in morphology among the Italian sampled populations referable to A. canescens/A. majellensis and so they should be referred to the same biological entity. The priority name for the A. canescens/A. majellensis complex, at the specific level, is A. canescens
Studio biosistematico su alcune entità del genere Armeria (Plumbaginaceae) nella penisola italiana
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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
Un approccio innovativo al testing psicopatologico: Taleia. parte II: attendibilità e validità del test
Full text linkStudies reliability and validity of TALEIA (Test for AxiaL Evaluation and Interview for Clinical, Personnel, and Guidance Applications). Retest (N = 123, one-weak interval) shows average r = 0.83, and correlations between parallel forms (N = 139) average to r = 0.74. An ACP (N = 280) on TALEIA, 16 PF, and PNP shows a four factors structure explaining 53% of the total variance, the first factor having psychopathological content and the others showing continuity between normal personality traits and clinical or personality disorders. A sample of «certified pathological» (N = 436), «certified normals» (N = 773 males), and two samples of «non-certified normals» (N = 386 draftees and N = 156 male students asking for school guidance) were compared. The MANOVA results were significant (p < 0.001), and post-hoc analyses (HSD test corrected for different size) showed significant differences related both to clinical status (pathologicals vs. normals) and to different situations (guidance and military draft). These results seem to allow a professional use of TALEIA, if different parameters for different applications are provided
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
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