1,720,971 research outputs found
Dune bed statistical analysis using multibeam echosound survey data
No full textIn alluvial river the bed forms represent the most relevant features governing flow resistance and bedload transport, they can have a wide range of geometry patterns corresponding to the same hydrometric condition. Bed forms influences the kinematic field, the flow resistance, the conveyance, and the stability of the fluvial infrastructures. Morphological changes and the bedload component can be evaluated considering the changing flow conditions, the geometry of the bedforms and their downstream migration. Different scales of bedforms may coexist within the channel, and so ripples are superimposed on the back of the primary forms. Bed undulation can be analysed through spectral analyses approach. In this study, Multi-Beam Echo-Sounder (MBES) surveys carried out in Po River (Italy) are considered. Combining bed surface DTM and spectral analysis, the filtered bed undulation is obtained, statistic geometrical properties of the bedforms and their kinematic are analysed
Iniziativa personale e coesione sociale. Nascita e sviluppo dellimprenditoria privata a Wenzhou [Private initiative and social cohesion. Birth and development of private entrepreneurship in Wenzhou]
No full textLa provincia del Zhejiang è una delle più dinamiche della Repubblica
Popolare Cinese. Oltre a essersi distinta quale importante polo
manifatturiero e commerciale, negli ultimi anni il Zhejiang ha
fatto passi da gigante dotandosi di grandi opere infrastrutturali e
innalzando la qualità della vita sia nella capitale Hangzhou, tra i
maggiori mercati per i consumi di alta gamma in Cina, sia in quei
centri di media dimensione che contribuiscono attivamente a rendere
ricca la provincia. Dopo anni di crescita a tassi superiori al
10%, nel 2007 il PIL ha registrato un +19%. Nello stesso anno il
PIL pro capite ha raggiunto il valore di 37.411 RMB (il doppio del
valore medio cinese). Nel 2008 la crescita del PIL si è mantenuta
sul 10%, malgrado la crisi economica mondiale abbia avuto forti
ripercussioni su un’area che esporta gran parte delle proprie produzioni
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
Remote sensing assessment of anthropogenic and climate variation effects on river channel morphology and vegetation: Impact of dry periods on a European piedmont river
No full textRivers are subject to increasing human pressure, resulting in a loss of their natural characteristics, further enhanced by climate change. The present study focuses on a piedmont reach of the Italian Po River and combines Landsat satellite information with hydrological records to investigate changes in sandbars exposure and riparian vegetation coverage, considering the summer period of 1984-2022. Satellite data were handled via Google Earth Engine, looking at common indexes such as the Modified Normalized Difference Water Index, which was used to identify temporal variations in wetted channel area, and the Normalized Difference Vegetation Index, considered as a proxy of vegetation coverage variations. Changes in the river hydrology were analysed by looking at the annual minimum water levels, the discharge duration curve, the stage-discharge relationship and the yearly annual water volume. Results suggest that a process of oversimplification is affecting this reach of the Po River, showing how climate change can affect piedmont European watercourses. Indeed, after an initial period where bars tended to be barer and somehow stable over time, in the most recent decade a different trend appeared, with vegetation able to colonize the exposed sandbars more. Using the Po River as an exemplary case study, this work suggests that prolonged dry periods, which are more common in recent decades, might impact large and medium rivers located in temperate climates, favouring the development of vegetation on exposed sandbars, eventually resulting in a less dynamic active channel.This research focuses on a piedmont reach of the Italian Po River, and combines satellite information with hydrological records to investigate changes in sandbars exposure and riparian vegetation coverage, considering the summer period 1984-2022. Using the Po River as an exemplary case study, the work shows that prolonged dry periods, more common in recent decades, might impact large and medium rivers located in temperate climates, favouring the development of vegetation on exposed sandbars, resulting in a less dynamic active channel. imag
Investigating velocity fluctuation by means of ADV at compound channel with installed hydropower propeller turbines.
No full textFlow field investigation by means of ADCP for the evaluation of hydropower propellers installed at open channel
No full textDispelling 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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