1,721,065 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
Sostenibilità ambientale e colture transgeniche: studio della risposta a condizioni di stress idrico in differenti cultivar di mais (Zea mays L.).
No full textSupply and demand mismatch analysis to improve regulating ecosystem services in Mediterranean urban areas: Insights from four Italian Municipalities
No full textCities are nowadays facing compelling environmental and climatic challenges that threaten human health and well-being; for this reason, enhancing their sustainability and resilience has rapidly ascended to the top of the global and regional political Agenda. The Urban Green Infrastructure represents a key factor in enhancing the environmental quality of cities, and its planning should be steered by a scientifically-sound operationalisation of the Ecosystem Services concept. In this work, we assess the Ecosystem Services mismatch for air quality regulation in four Italian Municipalities (Milan, Bologna, Rome, and Bari), considering the O3 and PM10 pollution; the study frames a geographical gradient (North-South) and has been conducted on a seasonal basis. We propose a composite-indicatorbased approach for estimating the supply and demand of said Ecosystem Services, including the dimensions of air quality and human health, using both geospatial and tabular data. The spatial and temporal features of mismatch allow distinguishing concerns depending on vegetation quantity (green space areas) and quality (functional diversity), structure of urban settlements and cross-cutting criticalities among cities, and to highlight common indicators of mismatch and priority areas for upcoming interventions. We found that northern cities (Milan and Bologna) suffer a high mismatch, as a result of poor air quality and limited vegetation abundance and functional diversity; southern cities experienced lower demand related to air quality; however, the high mismatch is driven by urban settlement structure and population vulnerability. We also found that compact urbanisation, namely dense urban fabric and the increasing buildings' height, is linked to a marked mismatch regardless of the city's dimension and geographical location. We believe such an effort is a fundamental step for translating the Ecosystem Services conceptual framework into the development plans of cities, and thus into concrete actions. Plus, as far as we know, this is one of the first studies explicitly linking urban structure indicators (e.g. building heights and compactness of the urban settlements) to the Ecosystem Services' mismatch
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
Biological effects of grafted peptides: different strategies to improve PLLA bioactivity
No full textDrought stress affects temperature response of leaf dark respiration in Mediterranean coastal maquis species
Full text linkLeaf dark respiration (R-D) plays a key role in plant carbon balance and the knowledge about how environmental stresses affect the response of R-D to temperature under field conditions, might improve the reliability of carbon budget models. This study analyzed the influence of air temperature and drought on the short-term temperature response of R-D of three woody ever green Mediterranean species. The field activities were carried out in two different coastal sites of Italy and for each site, two different areas located near the shoreline and inland were considered. The respiration-temperature response curves were carried out seasonally, together with leaf water potential and sclerophyll degree measurements. The effect of the average air temperature of the previous two days (T-2m) and predawn water potentials on basal respiration measured at 18 degrees C (R-18) and temperature sensitivity (Q(10)), were tested with linear regression analysis. Both R-18 and Q(10) were weakly correlated with T-2m, while a multifactor model including predawn water potentials yielded a better relation. These findings suggest that, besides air temperature, water availability and in general, plant energy balance, must be taken into account to predict acclimation of leaf dark respiration
Riconoscimento e reazioni affettive alle espressioni facciali di emozione nel corso della preadolescenza: un’analisi evolutiva.
No full textL’abilità di distinguere e interpretare le espressioni facciali delle emozioni rappresenta un elemento centrale del sistema di comunicazione non verbale, ha importanti implicazioni nello sviluppo sociale ed emozionale, e si manifesta a partire dalle prime interazioni sociali del bambino. Alla luce dei più recenti dati che hanno dimostrato come il riconoscimento delle emozioni non raggiunga una piena maturazione sino all’età adulta, il presente studio ha approfondito lo sviluppo di tale abilità in una fascia di età parzialmente trascurata dalla letteratura, la preadolescenza. Hanno partecipato allo studio 396 studenti (206 femmine) di età compresa tra gli 11 e i 14 anni, afferenti a due scuole secondarie di I grado delle province di Ancona e Firenze. I risultati del presente studio forniscono evidenze al fatto che il riconoscimento delle emozioni non migliori in modo costante dall’infanzia all’età adulta, ma sia sottoposto, nel corso della preadolescenza, ad un andamento opposto, in particolar modo nel riconoscimento di felicità e paura. In tale periodo si manifestano, inoltre, evidenti cambiamenti anche nelle reazioni affettive suscitate dalla visione delle espressioni emozionali
On the Fluxional Behavior of Dess-Martin Periodinane: A DFT and (17)O NMR Study
No full textThe structure and dynamics of the Dess-Martin periodinane, a I(V) iodobenzene compound widely used in organic synthesis as a mild oxidant, were studied by a combined (17)O NMR and DFT calculations approach. The results show that a degenerate [1,3] sigmatropic shift of iodine between the two oxygen atoms of each of the three acetoxy groups occurs in solution. The energy barrier of this process depends on the position of the acetoxy group with respect to the iodoxolone ring and is much lower than the energy barrier observed for similar I(III) compounds
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