1,721,096 research outputs found
Geolitologia: assetto strutturale e geologia, elementi geomorfologici e cenni pedologici sui paleosuoli fersiallitici
No full textIn: E. Orsomando e A.Catorci - Note Illustrative della Carta della Vegetazione del Foglio 312 Nocera Umbra. Braun Blanquetia, Camerino
Proceedings Workshop on “Geomorphological sensitivity and system response”.
No full textThe volume contains 14 articles, 7 abstracts and the guides to the excursions in the Marche Region and in the Modena Apennine
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
Combining multi-typologies landslide susceptibility maps: a case study for the Visso area (central Italy)
Full text linkThe research proposes a simple but geomorphologically adequate method to produce a combined landslide susceptibility map. In fact, in a logic of real use, offering type-specific landslide susceptibility maps to land use planners and administration could be not a successful solution. On the other hand, the simple grouping of more types of landslides could be misleading for model calibration considering that the relationships between slope failures and geo-environmental predictors should be conveyed by the abundance of each type of landslide resulting not specific and diagnostic for each typology. In this test, after having produced independent models for flow, slide and complex landslide by exploiting MARS (Multivariate Adaptive Regression Splines) and a set of type-specific geo-environmental variables, a combined landslide susceptibility map was obtained by combining the scores of the three source maps. The combined map was finally validated with a new unknown archive, showing very good performances
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
Geomorphological evidences of natural disasters in the roman archaeological site of Carsulae (Tiber basin, Central Italy)
No full textThe Roman town of Carsulae built-up after construction of the “Flaminia Way“, whose track, studied by Caius Flaminius between 220 and the 219 a.C., was realized with the aim to link Rome with the Adriatic coast. Probably arisen from the union of several communities, its importance, testified since I century A.C. by Strabone, Pliny the Younger and Tacit, was related to the excellent elevated geographical position, which allowed the control of the vast underlying lowlands, characterized by abundance of healthy waters and fertile soil. The town, built-up over a wide travertine deposits (early Pleistocene-middle Pleistocene), is located at the bottom of the Martani Ridge at elevation of about 500 m a.s.l., north of the Terni tectonic basin (Tiber Basin). Mountain ridge, made up by Mesozoic and Cenozoic limestones, forms a very thick aquifer that feeds a lot of springs along the pedemountain area; the most important one is that of San Gemini, in the surroundings of Carsulae, well known since ancient times. The passage between travertine deposit and mountain ridge is characterized by thick continental deposits, partly covering travertine itself.
Historical sources attributed the progressive decline and abandoning of Carsulae, mainly to the construction of a new track of the Flaminia Way and, more, to strong earthquakes that destroyed almost entirely the town. Recent studies, based on historical seismicity, support the hypothesis of catastrophic earthquakes, because of the presence of many active faults; some authors assumed travertine local deformations as real co-seismic dislocations, also affecting archaeological remnants.
First geomorphological surveys, evidenced the presence of dolines, even of great extension; a big one hosts the Roman amphitheatre. Deformations observed on the surface and disarticulating the archaeological remnants, can be related to a partial collapse of the doline edge, consequently to a strong earthquake and/or to the continuous and progressive dissolution due to surface and groundwater circulation. The latter produced also severe injuries to hydraulic works, as witnessed by historical sources. Besides, huge landslide deposits containing calcareous blocks and widely covering travertine and part of the Roman theater and amphitheatre, have been recognized. Mountainwards, where calcareous bedrock outcrops and in correspondence of an active fault, wide trenches and counterslopes are visible; these landforms are certain evidences of important mass movements (large landslides and/or deep-seated gravitational slope deformations).
The present state of knowledge allows to hypothesize, among possible causes of progressive decline and desertion of the town, also the occurrence of large landslides, probably connected to seismic events and to continuous degradation of travertine plate
X-ray imaging of horizontal jets in gas fluidised bed nozzles
Full text linkThe design of the fluidising air distributors, or nozzles, is one of the most important aspects influencing operation of fluidised beds at industrial scale. In this work, the study of the hydrodynamics in gas-solid fluidized beds where the primary gas injection is achieved through a nozzle-type gas distributor has been carried out, using an innovative X-ray imaging technique. Qualitative and quantitative results are reported, with particular focus on jets penetration length and their evolution. Results show that the lighter and the finer are the particles, the larger is the jet penetration. Since the experimental data do not match predictions available in literature, a new non-dimensional correlation based on hydrodynamic scaling and Froude number is also proposed. The new correlation takes into account the effects of jet velocity, particle density and particle size. A tentative mechanistic explanation for the departure from purely hydrodynamic scaling is offered
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