1,721,006 research outputs found
Study and Production of Special Targets for DCE Reactions with 0vbb-Decay Final States in the NUMEN Experiment
Full text linkL'abstract è presente nell'allegato / the abstract is in the attachmen
SPATIAL VARIABILITY AND ADAPTATION OF MEDITERRANEAN CORALLIGENOUS REEFS IN THE CURRENT AND GLOBAL WARMING SCENARIO
No full textVariability in temperature explains much of the spatial and temporal patterns we observe in the distribution and abundance of species worldwide. Taking advantage of the natural differences in temperature conditions between different biogeographical regions in Sardinia (Italy) the present Doctoral Dissertation aims to estimate the spatial variability, and adaptation of an iconic habitat of the Mediterranean Sea, the coralligenous reefs, both under current conditions and into global warming scenario, focusing in particular on one of the most important bio-constructor of the coralligenous habitat, the crustose coralline algae Lithophyllum stictiforme. The main questions that triggered my research hypothesis are: i) Does the structure of coralligenous assemblages change spatially in different biogeographic areas of Sardinia? ii) Is the spatial variation of the structure of coralligenous assemblages consistent through depth? iii) Is it possible to relate and thus predict differences in habitat structure based on thermal environment? iii) What is the response of one of the main builders of this habitat, the coralline algae L. stictiforme, to warming? In order to answer these questions, four studies, three descriptive and one manipulative, were conducted.In Chapters 1 and 2, the spatial variability of the deep coralligenous assemblages in different biogeographical areas around Sardinia and the vertical distribution of the coralligenous cliff in three different biogeographical areas of the Mediterranean Sea was evaluated, respectively. The observed variations seem largely related to biogeographic patterns rather than spatial distance and the results support the hypothesis that coralligenous assemblages, unaffected by local anthropogenic disturbance, may be relevantly different in structure and indicate that the lack of iconic species such as gorgonians and bryozoans, could merely be the result of biogeographic models probably related to the thermal environment.In Chapter 3, the knowledge of the subtidal climatology has been improved to be able to identify temperature descriptors that can be useful predictors in the structure of the coralligenous community and evaluate the relationship between the subtidal temperature and the change in the community structure. The aims were twofold: i) to evaluate if such heating descriptors can be useful predictors of the coralligenous reef community structure, ii) to identify the structure and the taxa of the community associated with the current heating events, so to provide tools to draw the trajectories of change of this community due to future warming scenarios. All the heating descriptors selected influenced several coralligenous response variables so that they all might be considered useful predictors for climate change investigations on the coralligenous reef.Finally, in Chapter 4, manipulative experiments on L. stictiforme were performed for the first time in the field to examine the temperature effects on the performance of the algae. Two experiments were done: in the first, algae were cross transplanted from a cold site to a warmer one and vice versa using two different depths, while in the second, transplants were done from 34 m to 15 m of depth within the same site to evaluate the influence of the thermocline, which is predicted to be increasingly deeper and persistent due to global warming. The main goal was to understand if L. stictiforme is adaptable to different thermal environments and identify the changes in thallus performance due to the different temperatures. An increase in temperature positively affected the alga responses, highlighting an unexpected adaptability of this crustose coralline alga and providing useful information to forecast the effects of warming and thermocline deepening on this habitat bio-constructor and to draw up future guidelines for restoration efforts of the coralligenous habitat
Predation risk of the sea urchin Paracentrotus lividus juveniles in an overfished area reveal system stability mechanisms and restocking challenges
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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
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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