1,721,200 research outputs found
Papini, Vailati e la "Cultura dell'Anima". Atti dei Convegni di studio Chieti, Maggio 2009 e gennaio 2010
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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
How severe wildfires and climate change could drive post-fire recovery of low-elevation vegetation: data from the first field campaign of a monitoring survey in the Karts (North-East Iatly)
No full textWildfires are a major ecological factor shaping vegetation and landscape, and their impacts are projected to
escalate due to global warming: the intensity, frequency and extent of fires are increasing all over the world,
with dramatic consequences on habitats. In summer 2022, severe fires burnt over 4000 hectares of the
western Karst between Italy and Slovenia, a submediterranean low-hilly area near the coast. In spring 2023, we
started a survey to analyze the consequences of the 2022 fires on plant communities and to monitor post-fire
vegetation dynamics. This study aims to investigate the possible effects of interactions of severe fires, climate
change and alien species on the floristic composition of habitats and on the typical processes of post-fire
vegetation recovery in a low-elevated area.
The study was focused on 4 major habitats of the western Karst, 3 of which dynamically related: the
thermophilous karst grassland Centaureo cristatae-Chrysopogonetum grylli, the thermophilous shrubland
Pruno mahaleb-Paliuretum spina-christi, and the karst downy oak wood Aristolochio luteae-Quercetum
pubescentis. Black pine plantations were also included due to their large extent. Permanent plots were
installed in the most intensively burnt areas mapped by satellite remote sensing data using a stratified random
sampling, by placing 7 x 7 m2 squared-plots in the four major habitat types identified on the basis of available
habitat maps and photo-interpretation. In each plot the percent cover of total vegetation, bare soil and of all
species was recorded.
At the habitat level, the highest total species richness and the lowest one for alien species were both found
in the dry karst grassland, which also exhibited excellent quantitative and qualitative recovery, confirming itself
as a highly resilient habitat. Shrubland showed a strong recovery of native shrub species, a rather high number
of total species and alien species compared to the investigated habitats, however with alien species occurring
with low cover values. The downy oak woodland had similar species richness values to shrubland, but higher
abundance of alien species, esp. Robinia pseudoacacia and Ailanthus altissima, and of native ruderal species:
therefore strong modifications of the floristic structure with deviations from the typical secondary succession
are possible. Black pine plantations were found to be characterized by the lowest total species richness, the
highest number of native ruderal and alien species, poor recovery of native species and unclear dynamic
trajectories.
The study is meant to provide information i) to identify interventions to support and eventually correct the
post-fire recovery of habitats, ii) to support land management policies to enhance the resilience and resistance
of the Karst landscape to wildfires
VICTORIA: an on-line information system on the lichens of Victoria Land (Continental Antarctica)
No full textVICTORIA is an on-line information system on the lichens of Victoria Land (Continental Antarctica). It provides descriptions and pictures of taxa, as well as nomenclatural, taxonomic, distributional and ecological data. Moreover, VICTORIA offers two interactive identification tools, dichotomous and multi-criteria keys, to the species. Friendly interfaces, optimized hierarchy of characters and multi-criteria filters based on easy-to-observe characters facilitate the identification process. At present VICTORIA provides information on 57 species occurring in the Terra Nova Bay area
PM Brushless DC Motor with exterior rotor for high efficiency household appliances
No full textShaded Poles Motors and Single-Phase Capacitor Induction Motors are the most common low cost solutions for household appliances. Alternative high efficiency
motors are the Electronically Controlled (with or without Permanent Magnet) Motors. This paper proposes a fractional Permanent Magnet Brushless DC Motor (PM BLDCM) with exterior-rotor and concentrated winding for variable-speed fan (domestic hood). It fulfils all the main application constraints
(low torque ripple in order to reduce noise and vibration, efficiency, simple structure, robustness, small size).
Comparisons between simulation and experimental results confirm the goodness of the proposed design procedure. In comparison with the line fed Single-Phase Capacitor Induction
Motors, the experimental results show that the PM BLDCM drive is a suitable high efficiency solution for household appliances such as domestic hoods
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
Complex faulting sequences controlled by dynamic topography in 3D experimental deformation of doubly-vergent coulomb wedges
No full textIn this paper sandbox modelling was used to investigate the dynamic effect of localised syntectonic erosion and\or sedimentation on the deformation mechanics of accretionary systems. High obliquity was chosen as the main boundary condition to analyse 3D strain partitioning of a doubly-vergent Coulomb wedge for the particular case in which a subduction po1artv reversal event affected wedge development. In the experiments the first phase of shortening ( P1) produces a preexisting topography affecting wedge development during second phase ( P2). The elevation potential can be varied in the models via sequential events of syntectonic denudation and/or sedimentation performed on distinct sectors of the deforming wedge. Experimental results suggest that the parallelism between the imbricates at the thrust front and the strike-slip fault at the rear of the prism predicted by theoretical models is valid only at steady-state when failure conditions exist everywhere at the basal décollement. Before this stage different velocity fields characterise mass transfer in distinct sectors leading to unexpected wedge behavior during which superficial extension or compression, both located i n the axial zone, predate the full development of a strike-slip fault
Role of pre-existing topography and overburden on strain-partitioning of oblique doubly-vergent convergent wedges
No full textScaled sandbox modeling was used to analyze the three-dimensional aspects of strain partitioning along obliquely convergent margins that underwent a subduction polarity reversal event. In the experiments, the first phase of shortening produced a preexisting topography that affected wedge kinematics during the second phase. Increasing degrees of obliquity during the first shortening phase produced different amounts of inherited topography and overburden, giving way to different effects on wedge response during the second phase of shortening. During the second phase the models with an inherited heavy overburden show an anomalous orientation for Riedel shears predating the development of a margin-parallel strike-slip fault. These shears are oriented at an angle that is higher than kinematically predicted with respect to the subduction slot, suggesting a transient rotation of the stress applied by the obliquity of subduction. In contrast, experiments with a lighter overburden do not show this inconsistency. In addition, all the models displayed an unexpectedly high accretion rate during the second phase of shortening, which we interpret to be dependent on topographical slope breaks inherited after the first phase of shortening and the critical asymmetrical architecture of doubly vergent wedges
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