1,721,025 research outputs found
Dimmi cosa guardi e (non) ti dirò chi sei: riflessioni su modelli televisivi e identità di genere
No full textL'articolo analizza la relazione tra adolescenza e consumi televisivi mainstream interrogando il nesso con i processi di costruzione dell'identità maschile e femminile
Spatial distribution patterns of dated landslide events in the Northern Apennines in response to Holocene regional climatic changes
No full textIn this work we examine the spatial and temporal distribution of radiocarbon dates from landslides on the NEfacing side of the Northern Apennines during the Holocene, focusing on the region’s associated vegetation and
climatic changes. We also propose a method for identifying areas and landslides that may contain very old
organic materials for future research in the region. This analysis was based on a principal component analysis
(PCA) on 5255 grid cells measuring 1 km2 each, overlaid on the study area. These grid cells incorporated variables derived from the terrain characteristics, including underlying lithologies and topographic features.
Our findings reveal that, during the upper Holocene, the last dated events of recurrent and single-event
landslides occurred first closer to the coldest and wettest territories once occupied by the glacier termina during the Last Glacial Maximum (LGMgt). Subsequently the last dated events occurred at distances greater than 30
km from the LGMgt, towards the mountain chain’s margin. Conversely, at the beginning of the Holocene, an
opposite pattern emerged, with landslide events occurring towards the chain interior. These spatial patterns were
consistently observed when considering also the entire dataset of 87 dates for landslide events. During the middle
Holocene, we observed that the recurrent landslides were primarily concentrated within a narrow belt 8.5 km
from the LGMgt. Furthermore, higher rates of landslide activity were associated with the 4.2 ka BP event and
persisted until approximately 2.0 ka BP, indicating a correlation with wet and cool periods. In conclusion, these
spatial patterns in landslide events can be linked to changes in precipitation patterns and dominant atmospheric
circulation in the mountain belt occurred since the beginning of the Holocene
Active Landslide Portions Contribute to Surface Water Concentration: Insights from GIS Analysis and Field Data in the Northern Apennines
No full textThe distribution of small water bodies associated to landslides in a part of the Northern Apennines (Italy) has been explored, for the first time, using GIS analysis, field surveys and geophysical imaging. The analysis on the whole investigated area was performed using the Topographic Wetness Index (TWI), a proxy for surface soil moisture patterns based on topographic characteristics. The case studies correspond to two large landslides deep-rooted in the bedrock. The Sauna landslide in the Parma torrent basin and the Berceto landslide in the Taro river basin, have been investigated through field work, geophysics, boreholes and radiocarbon dating for the time constraints of the water bodies. The TWI analysis carried out both at the regional and the case-study scale has shown that low values of this index (drier areas) are more associated with inactive landslides portions, whereas higher values (wetter areas) are more associated with active portions. The analyses on the case studies highlighted that the condition characterized by wet soil and/or the presence of small water bodies are spatially persistent across time in correspondence of the same portion of the landslide that preserves landforms able to maintain these waters. As highlighted by geophysics, these landforms are in connection with deep shapes of the sliding/rupture surface of the landslide that mimic those at the surface
The influence of topographic variables on treeline trees under different environmental conditions
No full textIntegrating Dendrogeomorphology into Stress–Strain Numerical Models: An Opportunity to Monitor Slope Dynamic
No full textMonitoring systems are recognized worldwide as fundamental tools for landslide risk management. However, monitoring can be difficult when dealing with large slopes in forested areas. In these situations, dendrogeomorphology can offer a low-cost and low-impact alternative for providing distributed information with an annual temporal resolution. The present study is a first attempt to integrate dendrometric and dendrogeomorphic data into a numerical finite difference model, in order to simulate the stress-strain behavior of the tree-slope system. By using a parametrical approach, the capability of the numerical model to effectively reproduce the tree stem anomalies (i.e., tilting angle, J-shaped feature, and internal stresses causing tree-ring growth anomalies such as eccentric growth and reaction wood) was verified, and the target parameters for the model calibration were identified based on a sensitivity analysis, which emphasized the relevance of the wood deformability; moreover, the interpretation of results allowed to point out different peculiarities (in terms of type of deformation, falling direction, and distribution of internal stresses) for different slope conditions (kinematics and depth of the failure surface) and different zones of the landslide (head scarp, main body, and toe). Afterwards, the modeling approach was applied to the Val Roncaglia landslide (Northen Italy), which involves a complex roto-translational kinematics, characterized by multiple sliding surfaces. The simulated stem anomalies showed good agreement with the ones arising from onsite dendrometric surveys, and they confirmed the conceptual model of the landslide, enabling the planning of further specific investigations. Moreover, the capability of the model in reproducing the tilting angle of trees, if correlated to their eccentricity, could provide a quite long time series (over more than 50-60 years) of the landslide reactivation and allow the use of dendrochronological data for the model calibration, thereby enhancing slope dynamic monitoring and landslide risk management
Changes in the tree-ring δ18O from the Forni Glacier forefield due to glacier stream water inputs and climate change: potential use for environmental and climatic reconstructions
No full textClimate sensitivity of trembling aspen radial growth along a productivity gradient in northeastern British Columbia, Canada
No full textPresentazione della ricerca: il contesto e le scelte metodologiche
No full textIl capitolo tratta delle caratteristiche socio-demografiche del territorio trentino, per tracciare un profilo di abitanti e risorse del contesto. Si passa poi in rassegna la letteratura scientifica che ha trattato delle problematiche inerenti il tema di genere e adolescenza. Viene infine illustrato il disegno della ricerca, che ha previsto diverse fasi e l'adozione di una metodologia mista. Le ragioni che hanno portato a questa scelta sono da rintracciare nell'esigenza di arrivare a costruire un quadro rappresentativo della condizione e delle opinioni degli adolescenti trentini, all'interno del quale fare approfondimenti qualitativi in merito al tema del corpo, così come viene modellizzato dai media. Per questo sono stati impiegati un questionario di opinione costruito ad hoc e somministrato ad un campione rappresentativo di adolescenti trentini e focus group rivolti anch'essi agli adolescenti trentini
Ragazze e ragazzi a scuola: rendimento, vissuti, ruoli. Prima analisi critica del campione rispetto all’ambito scolastico,
No full textNel contributo sono prese in esame, oltre alle caratteristiche socio-culturali e di contesto delle e dei giovani trentine/i, anche le dimensioni delle loro disposizioni verso famiglia, scuola da un lato e delle loro aspettative per il futuro dall’altro. La condizione occupazionale dei genitori delle/degli adolescenti indagati restituisce un quadro nel complesso posititvo, ma che vede sfavorite ancora una volta le donne: il 91,3% dei padri e il 73,6% delle madri sono occupati. Se si prende in esame la posizione professionale dei genitori, emerge chiaramente il forte disequilibrio di genere nelle posizioni occupate da uomini e donne: nella categoria dirigenti e imprenditori si trova una quota bassissima di donne (11,8%) contro il 32,2% di uomini. Oltre a questi dati di sfondo si è approfondito l'aspetto del benessere percepito dagli adolescenti a scuola e a casa. Ai fini della ricerca, infatti, la soddisfazione per i vissuti sperimentati a scuola e a casa è apparsa rilevante per le ricadute che può esercitare sul rapporto che gli adolescenti sviluppano con loro stessi e con il loro corpo. Dall'analisi dei dati emerge che la soddisfazione più alta si lega alla sfera amicale, come riscontrato anche in letteratura. Quote consistenti di ragazze e ragazzi testimoniano relazioni soddisfacenti con i genitori (con una leggera preferenza per le relazioni con la madre) e con i compagni di scuola (anche in questo caso con una leggera preferenza per i rapporti intessuti con la componente femminile). Più controversi invece appaiono i vissuti sentimentali con l’altro sesso e le sensazioni quotidiane derivanti dalle relazioni con i/le docenti, rispetto alle quali è necessario continuare a riflettere per trovare in futuro nuove strade da percorrere per raggiungere una maggiore armonia in un contesto, quello della scuola, dove gli/le adolescenti spendono larga parte della loro giornata
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