1,550 research outputs found
Between imperialism and anarchy. The paradox of L’altro Agostino by Gaetano Lettieri twenty years later
No full textThis note essentially constitutes a re-presentation of L’altro Agostino. Ermeneutica e retorica della grazia dalla crisi alla metamorfosi del De doctrina christiana (Brescia: Morcelliana, 2001) by Gaetano Lettieri. Reprinted in 2002, and long at the centre of the scholarly debate, L’altro Agostino has been a seminal and influential book. Over the past twenty years, however, Lettieri has had the opportunity to further develop his perspective, deepening some earlier insights. This brief discussion is then intended as a new critical evaluation of L’altro Agostino in light of the speculative progress of its author
Sampling riparian vegetation and morphology with cross sectional transects: first results from three North-eastern Italian rivers
No full textThis study investigated woody vegetation and geomorphology in three gravel-bed rivers (North-East Italy) affected by different intensities of human pressure. To characterize the links between riparian vegetation and morphological settings, the analysis were carried on at least one braided and one wandering sub-reach along each river. A total of 710 plots (4×4 m) along eighteen cross-sections (266-1000 m long) of the floodplain extent were surveyed. Morphological characteristics, stand and species composition has been analysed. Preliminary results suggest that the composition and characteristics of the riparian vegetation of the three fluvial ecosystems and the gradients between the geomorphic units in morphological variables have been strongly affected by the human pressure. There are relevant differences in the species composition of riparian woody communities, the elevation, and the geomorphic persistence of floodplains, islands and bars between the rivers. This will have implications on the forest management and conservation planning of riparian habitats
Alcune considerazioni sulle ricerche relative a colate detritiche e correnti iper-concentrate in Italia
No full text
Relationships among basin area, sediment transport mechanisms and woody storage in mountain basins of the Dolomites (Italian Alps)
No full textQuantification of in-channel large wood recruitment through a 3-D probabilistic approach
No full textLarge wood (LW) is a relevant factor in physical, chemical, environmental and biological aspects of low order mountain streams system. LW recruitment, in turn, is affected by many physical processes, such as debris flows, shallow landslides, bank erosion, snow- and wind throw, and increases the potential hazard for downstream human population and infrastructures during intense flood events. In spite of that, the LW recruitment quantification and the modelling of related processes are receiving attention only since few years ago, with particular reference to hillslope instabilities which are the dominant source of LW recruitment in mountainous terrains at regional scale. Actually, models based on the infinite slope approach, commonly adopted for slope stability analysis, can be used for estimating probable LW volume and for identifying the most hazardous areas of wood input, transport and deposition. Such models, however, generally request a robust calibration on landslide inventory and tend to overestimate unstable areas and then LW recruitment volumes. On this background, this work proposes a new LW estimation procedure which combines the forest stand characteristics of the entire catchment and a three-dimensional probabilistic slope stability model. The slope stability model overcomes the limits of the infinite slope approach and considers the spatial variability and uncertainty of the model input parameters through a Monte Carlo analysis. The forest stands characteristics allow including the root reinforcement into the stability model as stochastic input parameter, and provide the necessary information to evaluate the forest wood volume prone to be recruited as LW and its position on the hillslopes. The procedure was tested on a small mountainous headwater catchment in the Eastern Italian Alps, covered with pasture and coniferous forest and prone to shallow landslide and debris flow phenomena, especially during the late spring and the early autumn. The results showed how the proposed procedure is very promising. In fact, the estimated LW volume is comparable with the one measured by field surveys. As the procedure used data commonly available, it is of great interest as a tool for forest planning and management, and to predict the effects of forest alterations, both of natural and of anthropic origin (e.g. diseases, fire, clear-cutting or clearing), as well as helping in-channel wood retention structures positioning
Test of Isospin Symmetry along the N=Z line
No full textThe study of isospin symmetry in nuclei as a function of angular momentum has now become established as a very powerful tool to understand nuclear properties in rotating nuclei. These studies have become feasible in the last decade due to recent experimental developments in the identification of proton-rich nuclei produced with very low cross sections. Contemporaneously, state-of-the-art shell-model codes have been produced for the description of these data. The synergy between theory and experiment for the study of energy differences of mirror and isobaric analogue nuclei in the mass region between A ∼30 and ∼60 has allowed the investigation of the evolution of the nuclear wave functions with increasing spin. The alignment process, changes of the nuclear shape and the intrinsic configuration, together with the evidence of isospinnon-conserving terms of the nuclear interaction are examples of the type of phenomena that can be studied from the analysis of Coulomb energy differences. © 2..
Dam – break shock waves: A two – phase model for mature and immature debris flow
No full textTo predict flood and debris flow dynamics a numerical model ,based on 1D De Saint Venant equations ,modified for including erosion / deposition processes along the path ,was developed.To better predict immature ( stratified ) flows ,the model was improved in order to feature ,in a more realistic way,the distribution of the particles of different size within the mixture .The model is feasible to predict the whole debris flow phenomenon , i. e. the triggering ,mobilising and stopping processes of both mature and immature debris flow in different dam-break contitions
Experimenting with tangible and intangible layers: COVID-19 as another intangible layer
No full textEl trabajo por superposición de tramas de información gráfica ha sido una metodología de desarrollo proyectual utilizada por grandes arquitectos como alternativa a otros procesos metodológicos de diseño. Estas capas pueden estar referidas a aspectos tangibles de la arquitectura y el diseño urbano, esto es, elementos físicos, tocables, o a esas tensiones invisibles, intangibles que aportan valor sustancial a la arquitectura. La experimentación con este tipo de trabajo aporta al alumnado una metodología complementaria a otros procesos más lineales y controlados, permitiendo que la propia superposición de capas sugiera la aparición de ‘estructuras de sucesos’ inesperadas. En este artículo se presenta la secuencia de experimentación realizada sobre estas bases metodológicas en tres ejercicios consecutivos desde la composición en dos dimensiones, pasando por lo matérico hasta la creación de un proyecto completo. La pandemia COVID-19 entra a formar parte de estos estratos superpuestos de capas influyendo sustancialmente sobre el resultado final.Overlapping graphic information patterns is an architectural design methodology used in the recent past by renowned architects as an alternative way to other design processes. Design layers can be referred to tangible aspects of architecture and design, this is, physically touchable elements, or to those invisible tensions that add core substantial value to architecture. By experimenting with this kind of work, students acquire a complementary methodology to other more linear and controlled processes, allowing them to bump into unexpected ‘structures of events’ suggested by the very overlapping layers. In this article we present the experimental sequence developed on this methodological basis over three consecutive exercises, from a two-dimensional composition, going through materiality until the pursuit of a whole architectural project. The COVID-19 pandemic enters the picture to take part of this stratified array of layers and substantially influence the final result. A todos y cada uno de los componentes del alumnado de la asignatura de Arkitekturarako Saiaketerarako Laborategia del curso 2019-2020, por su dedicación, colaboración y trabajo. Las imágenes de sus trabajos están colgadas en https://www.juansadaba.com/labea y en Instagram: labealab.Peer Reviewe
A probabilistic multidimensional approach to quantify large wood recruitment from hillslopes in mountainous-forested catchments
No full textLarge wood (LW) plays a key role in physical, chemical, environmental, and biological processes in most natural
and seminatural streams. However, it is also a source of hydraulic hazard in anthropised territories. Recruitment
from fluvial processes has been the subject of many studies, whereas less attention has been given to hillslope
recruitment, which is linked to episodic and spatially distributed events and requires a reliable and accurate
slope stability model and a hillslope-channel transfer model.
The purpose of this study is to develop an innovative LW hillslope-recruitment estimation approach that
combines forest stand characteristics in a spatially distributed form, a probabilistic multidimensional slope
stability model able to include the reinforcement exerted by roots, and a hillslope-channel transfer procedure.
The approach was tested on a small mountain headwater catchment in the eastern Italian Alps that is prone to
shallowlandslide and debris flow phenomena. The slope stabilitymodel (that had not been calibrated) provided
accurate performances, in terms of unstable areas identification according to the landslide inventory (AUC=
0.832) and of LW volume estimation in comparison with LW volume produced by inventoried landslides
(7702m3 corresponding to a recurrence time of about 30 years in the susceptibility curve). The results showed
that mostLWpotentiallymobilised by landslides does not reach the channel network (only about 16%), in agreement
with the few data reported by other studies, as well as the data normalized for unit length of channel and
unit length of channel per year (0–116m3/km and 0–4m3/kmy−1).
This study represents an important contribution to LW research. A rigorous and site-specific estimation of LW
hillslope recruitment should, in fact, be an integral part of more general studies on LW dynamics, for forest
planning and management, and positioning in-channel wood retention structures
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