199,481 research outputs found
The globalization of space (Ed. M Palladino)
No full textThis collection of essays is the first to focus on what Foucault termed ‘heterotopias’, spaces that exhibit multiple layers of meaning and reveal tensions within society
Displaced women: multilingual narratives of migration in Europe (Ed. M Palladino)
No full textMultilingual Narratives of Migration in Europe Lucia Aiello, Joy Charnley, Mariangela Palladino. WOMEN Edited by Lucia Aiello, Joy Charnley -mm and Mariangela Palladino Displaced Women Displaced Women: Multilingual Narratives of..
Corrigendum. Maars to calderas: end-members on a spectrum of explosive volcanic depressions
No full textA corrigendum on
Maars to calderas: end-members on a spectrum of explosive volcanic depressions
by Palladino, D. M., Valentine, G. A., Sottili, G., and Taddeucci, J. (2015). Front. Earth Sci. 3:36.
doi: 10.3389/feart.2015.00036
Reason for Corrigendum:
In the original article (Palladino et al., 2015), there was an error in Figure 1. The vertical axis
of the qualitative plot reported erroneously “ratio of juvenile to lithic materials in deposits outside
of depression”. The correct wording is as follows: “ratio of juvenile to total (i.e., juvenile+lithic)
materials in deposits outside of depression”. In fact, as it was reported correctly in the text, the
amount of juvenilematerial (i.e., scoria or pumice) deposited ouside the different types of explosive
volcanic depressions increases from zero (i.e., no juvenile, all lithic products), as is the case of
hydrothermal (phreatic) explosion craters, to become largely dominant over the lithic component
in the case of ash flow deposits associated with large overpressure collapse calderas. The corrected Figure 1 appears below. The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way
An Archimedean research theme: the calculation of the volume of cylindrical groins
No full textStarting from Archimedes’ method for calculating the volume of cylindrical wedges, I want to get to describe a method of 18th century for cilindrical groins thought by Girolamo Settimo and Nicolò di Martino. Several mathematicians studied the measurement of wedges, by applying notions of infinitesimal and integral calculus; in particular I examinated Settimo’s Treatise on cylindrical groins, where the author solved several problems by means of integral
Mass and Surface Energy Balance Approaches for Monitoring Water Stress in Vineyards
No full textTree crops are representing one of most widespread agricultural systems in Mediterranean regions, thus contributing in a substantial way to the economy and productivity of primary sectors of the countries interested. Besides the aspects concerning their economical relevance, tree crops like vineyards, olive and orange orchards are also typical elements of the Mediterranean landscape, and their ecological role has been recently revitalised in consideration of their function as carbon sinks for the Kyoto agreement.
The environmental and economical sustainability of these agricultural systems in arid and semi-arid zones has to cope with the availability and management of water resources for irrigation. During recent years there has been a substantial progress in understanding the evolution of evapotranspiration processes in cropping systems, and detailed models and measurement techniques have been set-up for describing the mass and energy exchanges in the soil-plant- atmosphere continuum. However, due to the complexity of rooting systems and aerial parts further steps are needed for a full comprehension of hydrological processes in tree crop systems, with special regard to water stress conditions.
Within the research project P.R.I.N. 2008 “Assessment of mass and energy fluxes for the irrigation management of Mediterranean tree crops” different techniques for measuring evapotranspiration fluxes in tree crops will be developed and tested, from innovative methodologies based on remote sensing observations to in-situ observations (xylem-flow measurements and micro-meteorology). These data-sets have be interpreted by means of physical approaches, with a modelling perspective of the observed processes
L'urgenza di un identikit
No full textL’idea di Millennials è nata, si è sviluppata e articolata, strutturandosi in modo ben più complesso da quelle che erano le istanze iniziali, intorno a una necessità: fotografare la scena della grafica italiana degli anni più recenti, focalizzandosi sulle produzioni di autori nati dopo il 1980. Il discrimine temporale nasce dalla constatazione di un cambio di passo, di una trasformazione radicale dovuta a più fattori: l’evoluzione tecnologica (è questa la prima generazione completamente digitalizzata), la crisi economica, che ha necessariamente imposto nuove modalità di produzione e di autorappresentazione, i percorsi formativi, strutturati da corsi di studi rivolti all’ambito disciplinare del design della comunicazione visiva da scuole pubbliche e private presenti nei principali centri italiani ed esteri.The idea of Millennials started out around a specific need, growing into a more complex entity than what was already intended. The need was that of giving a snapshot of Italian graphic design in recent years, with a special focus on the production of designers born after 1980. The time-based distinction was based on the observation of a change of pace, of a radical transformation due to several factors: technological development (this is the very first fully-digital generation); the economic crisis, which has necessarily imposed new modes of production and self-representation; the training pathways including courses on visual communication design provided by private and public schools based in the main Italian and foreign cities
Intrusioni in un compito di memoria di lavoro: E' solo un effetto categoria?
No full textNella prova di memoria di lavoro proposta da De Beni, Palladino, Pazzaglia
e Cornoldi (1998) il termine intrusione si riferisce a informazioni erroneamente inserite nel ricordo finale. Il numero di intrusioni è considerato solitamente come misura dell’efficienza del processo di controllo in memoria di lavoro, in quanto alcune ricerche hanno mostrato che soggetti con scarsa memoria di lavoro producono un maggior numero di intrusioni e in particolare intrusioni di parole maggiormente attivate. Nel test di span, le parole maggiormente attivate sono però anche parole appartenenti ad una stessa categoria. Introducendo nel test come controllo parole appartenenti ad una seconda categoria, abbiamo voluto valutare in che misura il maggior numero di intrusioni delle parole maggiormente elaborate, prodotto in questo tipo di compito, sia dovuto al fatto che queste sono più accessibili perché appartengono ad una ben specificata categoria
On the space-time distribution of major explosive volcanic eruptions on Earth
No full textExplosive volcanic activity on Earth is typically discontinuous in space and time. The occurrence of spatial/temporal eruption clusters due to mutual cause-and-effect relationships or external triggers (e. g., tectonic and/or tidal forcing) is still debated. To detect possible clustering of major explosive eruptions, we test the distribution of eruptions with Volcanic Explosivity Index (VEI) >= 4 from 1750 to present. The 143 documented VEI >= 4 events display a markedly non-uniform frequency distribution, with the highest relative probability of eruption recurrence within 500 km distance from the preceding event. The analogous frequency pattern obtained from randomized data series of the same catalogue suggests that the observed eruption pattern is primarily imparted by the geodynamic distribution of volcanoes (mostly located along tectonically active linear belts), with no evidence of mutual or external influence. Our results highlight a counter-intuitive array of major eruption loci as a consequence of the intrinsic worldwide asymmetry of explosive volcanism, with implications on hazard assessment. Citation: Palladino, D. M., and G. Sottili (2012), On the space-time distribution ofmajor explosive volcanic eruptions on Earth, Geophys. Res. Lett., 39, L12308, doi: 10.1029/2012GL052541
Levee body vulnerability to seepage and impact of animal burrows - The Tanaro River case study
No full textFloodplains are naturally subjected to inundations, that pose a threat to the populations and facilities located along the watercourses. To reduce the hydraulic risk in flood-prone areas, various protection measures have been implemented over the centuries, including the realization of earthen levees. However, flooding is frequently related to the failure of levees, whose performances can thus induce some level of risk. Chapter 1 provides a brief description of the concept of Residual Risk in protected areas and introduces the issues of seepage-induced failures and impact of animal burrows in the seepage vulnerability of earthen embankments. In Chapter 2 the most common causes of failure of earthen levees are described and some statistics concerning the diffusion of levee failure types are presented, with the main purpose to highlight the large diffusion of seepage-induced failures. The seepage process is triggered by the hydraulic gradients established between the outboard and inboard faces of the levee, able to induce a seepage flow and the consequent removal of soil particles from the levee body. The governing equations of seepage are presented in Chapter 3. Seepage is one of the most dangerous causes of levee failure. Indeed, if the erosion process triggered by seepage remains undetected, the collapse of the embankment is barely predictable and, consequently, unexpected and catastrophic. Several research studies have dealt with the evaluation of the seepage vulnerability of earthen embankments. Some of these studies, subdivided into hydro-geotechnical modelling and reliability-based approaches, are illustrated in Chapter 4, focusing on their advantages and gaps. Currently it is widely acknowledged that the presence of discontinuities, such as animal burrows, within the embankments facilitates the onset of seepage. The possible impact of burrows in the seepage vulnerability of earthen levees is analysed in Chapter 5: after a literature review addressed to highlight the relevance of the issue and some possible mitigation measures, a new methodology for the assessment of the effect of burrows on earthen levee vulnerability to seepage, specially developed in this thesis work, is presented. The procedure couples an existing methodology for the estimation of the seepage probability of undamaged embankments, developed by the IRPI-CNR, with the use of a finite element analysis software, SEEP/W (Geostudio ®, 2008). In Chapter 6 the procedure is performed on 21 levees selected along the Tanaro River (northern Italy) and the results are presented and discussed. They put into evidence that the IRPI-CNR procedure is quite reliable in the identification of the most vulnerable stretches in the flood defence system, when the undamaged structures are investigated. Furthermore, the new procedure allows to catch the worsening of the stability conditions of the levees when the presence of burrows is simulated: they accelerate the saturation of the levees and reduce the required time for the saturation line to reach the landside toe, a configuration which marks the onset of the seepage process. The cavities cause a general increase in the seepage vulnerability of the embankments, which is higher as the length of the burrows increases. The collected data concerning the levee system and the results deriving from the application of the procedure have joined the Italian earthen levee Database (Database nazionale ArgiNature in TErra, DANTE), developed by IRPI-CNR and addressed to civil protection purposes. The database constitutes by itself a precious base to support flood risk management activities in the study area. The most important novelty introduced by the developed methodology consists in the capability to predict the performances of existing levees in the hypothesis they get damaged, due to the presence of burrowing animals or other causes. The main advantages of the procedure consist in: 1) the capability to provide a quantitative estimation of the impact induced by burrows, through e relatively simple and expeditious procedure; 2) the use of a probabilistic approach, which allows the estimation of the seepage probability regardless of the knowledge of the hydraulic conductivity, a common unknown of the problem; 3) the definition of seepage vulnerability classes, useful to identify possible weak points and to establish the priority of intervention within extended levee systems Chapter 7 presents a critical analysis of the advantages and limitations of the purposed procedure, and suggests some possible further developments
Historical Notes on Star Geometry in Mathematics, Art and Nature
No full textIn this paper we will try to examine how in the history of polyhedra (and in particular star polyhedra), a long period of “discovery” of individual types due to the observation of natural objects or due to artistic imagination preceded (and was connected with) the mathematical solution fixing the “right” definitions. Such long period of discovery—we will argue—influenced further investigations on nature and art
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