1,721,453 research outputs found
Vivere d’acqua. Archeologie tra Lio Piccolo e Altino
Full text linkVivere d’acqua. Archeologie tra Lio Piccolo e Altino: Mostra Archeologica, Centro Culturale Manin, Ca’ Savio (Comune di Cavallino-Treporti). La mostra mira a mettere in risalto le strutture e le forme del paesaggio dell’area lagunare/litoranea antica dell’attuale territorio di Lio Piccolo e Cavallino/Treporti. La narrazione ha come filo conduttore l’importante attività pionieristica condotta da “Tito” Ernesto Canal alla fine del secolo scorso, seguendo un percorso cronologico che si snoda dall’età imperiale romana fino al VI-VII secolo d.C. Attraverso l’esposizione dei materiali archeologici, che sono stati rinvenuti in occasione delle ricerche archeologiche e la ricostruzione delle strutture antiche, il visitatore può comprendere le complesse vicende insediative legate a un territorio molto dinamico, in sospeso tra terre, mare e lagune. In questi luoghi le comunità, profondamente collegate al centro di Altino, hanno imparato a costruire, vivere e “dare forma e struttura” alle acque ed alle barene della Laguna. Qui si sono formati quei gruppi umani che hanno fatto di quell’ambiente la loro cultura. Il percorso espositivo, narrato in maniera semplice e diretta, vuole descrivere le caratteristiche di quelle che erano le infrastrutture della Laguna antica, tardoantica ed altomedievale: saline, peschiere e luoghi di approdo e di approvvigionamento idrico descrivono una zona a lungo sfruttata per la produzione di attività economiche molto redditizie e per il mantenimento dell’efficiente macchina portuale al servizio di Altino. Un focus specifico è dedicato alla villa romana di Lio Piccolo, luogo che ha un posto particolare nella memoria della comunità di Cavallino-Treporti e che ben racconta la vita lagunare di 2000 anni fa
Red-leafed species for urban “greening” in the age of global climate change
Full text linkUrban trees provide vital ecosystem services such as mitigating heat island, improving air quality by removing various air pollutants, capturing rainwater, and acting as topsoil carbon storage. The aesthetic value of urban trees is also another feature that has to be considered in the context of urban greening. Classical criteria for the selection of urban trees have to respond to new challenges imposed to the cities in a near future. Global climate change factors increase the harshness of our cities, and thereby the plant resilience to abiotic stresses has also to be seriously considered for planning the urban greening. Red-leafed species, characterized by the permanent presence of foliar anthocyanins, show a greater tolerance to different environmental cues than green-leafed species commonly used in our cities. In addition, red tree species own a great aesthetic value which has been underestimated in the context of urban areas, especially in the harsh Mediterranean cities. In this study, we emphasize the “privilege of being red” from different point of view, in order to drive the attention to the possibility to increase the use of red-leafed species for urban “greening”. Some possible negative aspects related to their use are rebutted and the direction of future researches are proposed
L'autopercezione: forte e debole, piccolo e grande
No full textIl saggio analizza gli eleborati degli studenti di alcune scuole professionali di Perugia in merito alla percezione soggettiva relativa alla crescita (grande/piccolo) e in rapporto all'aggressività esibita o percepita (forte/debole). Ne emerge un quadro articolato di adolescenti confusi e legati ancora fortemente alla famiglia, specie i ragazzi stranieri, che spesso risultano più adulti dei loro coetanei, poiché spesso impegnati nella cura dei fratelli più piccoli o della casa
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
CONTROLLO DELLE DEFORMAZIONI CROSTALI DELL’AREA DEL MAR PICCOLO E DELLE MURGE
No full textCONTROLLO DELLE DEFORMAZIONI CROSTALI DELL’AREA DEL MAR PICCOLO E DELLE MURG
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
Chlorophyll fluorescence, photoinhibition and abiotic stress: does it make any difference the fact to be a C3 or C4 species?
Full text linkChlorophyll fluorescence analysis is one of the most powerful and widely used techniques to study the effect of stresses on the photosynthetic process. From the first utilization, the Fv/Fm ratio has been largely used as a sensitive indicator of plant photosynthetic performance. Decreases of this index are indicative of the reduction of photosystem II (PSII) efficiency, namely photoinhibition. In the last 20 years, application of chlorophyll fluorescence has been largely improved, and many other informative parameters have been established to detect PSII photochemical efficiency and the partitioning of light energy to alternative dissipative mechanisms (qE, energy-dependent quenching; qZ, zeaxanthin-dependent quenching and qI, photoinhibitory quenching; qH, sustained photoprotective antenna quenching; qM, quenching dependent to chloroplast movement; qT, light harvesting complexes II–I state-transition) such as the recently developed “photoprotective power” of non-photochemical quenching (pNPQ). This review reports a brief description of the main chlorophyll fluorescence parameters and a wide analysis of the current bibliography on the use of different parameters which are useful to detect events of PSII photoinhibition. In addition, in view of the inherent differences in morpho-anatomical, physiological and biochemical features between C3 and C4 metabolism, possible differences in terms of photoinhibition between C3 and C4 plant species under stress conditions are proposed. The attempt is to highlight the limits of their comparison in terms of susceptibility to photoinhibition and to propose direction of future research which, assisted by chlorophyll fluorescence, should improve the knowledge of the different sensitivity of C3 and C4 to abiotic stressors
The influence of water deficit and re-watering on flower bud morphogenesis in young apricot trees (Prunus armeniaca L.)
No full textIn deciduous fruit species, as well as in apricot, floral bud initiation, differentiation and organogenesis take place during the summer season that precedes anthesis. A number of factors (environmental conditions, cultural practices, abiotic stresses) have been identified as important triggers able to modify the regularity of floral differentiation. The water availability represents a crucial key factor, particularly under Mediterranean climates characterized by long drought periods. This investigation aimed to assess the influence of summer water deficit and re-watering treatments on floral morphogenesis, growth and quality of flower buds in apricot. Trials were carried out on two-year-old potted trees ('Portici') grown at the research station of University of Pisa. Plants were divided into three uniform groups: the first one was watered daily maintaining soil water content around 90% of field capacity, whereas second and third ones were subjected, in June or July, to 30 days of imposed water deficit followed to re-watering. In order to determine the evolution of floral bud differentiation, prior, during and after the imposed water stress, histological analyses were carried out. From autumn to spring, qualitative traits of flower buds (growth, anomalies) were also analyzed. Midday stem water potential was used to determining water status, and leaf gas exchanges were measured during trials. Both water stress periods affected the floral differentiation leading to a temporary shutdown. The plants stressed in June were able to recover the development of meristematic apices already after two weeks from the regular re-watering, while those stressed in July showed a strong delay up to the end of summer. As a consequence, variations in bud size and flower anomalies were observed. Results confirm that water stress may play an important role in flower bud differentiation and development influencing the quality of flower buds
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