1,721,542 research outputs found
Indagini geoarcheologiche nel sito pluristratificato dell’Acquarella (Camaiore –LU)
No full textL'integrazione tra indagini archeologiche e geomorfologiche avviate nella fascia costiera di Camaiore ha permesso di ottenere alcuni risultati preliminari sulle vicende del popolamento in un territorio caratterizzato da una varietà di aspetti morfologici in continua evoluzione: la conoide del fiume Camaiore, un'ampia area umida e i cordoni dunali litoranei, intervallati a depressioni retrodunali. Le indagini si sono concentrate, in particolare, nel sito dell'Acquarella per il quale, grazie alle ricerche pluriennali della Soprintendenza per i Beni Archeologici della Toscana in collaborazione con il Civico Museo Archeologico di Camaiore, è possibile disporre di un articolato quadro di conoscenze archeologiche
Susceptibility to translational slide-type landslides: Applicability of the main scarp upper edge as a dependent variable representation by reduced chi-square analysis
Full text linkThe applicability of main scarp upper edge (MSUE) as dependent variable representation was performed in a translational slide susceptibility zonation of the Milia and Roglio basins, Italy. Two landslide inventories were built thanks to detailed geomorphological mapping and aerial photograph analysis. The landslides were used to create the models before 1975, while those after 1975 were employed to validate the predictive power of the model. Possible landslide-related factors were chosen from a geomorphological survey. The inventory landslide maps and the landslide-related factor maps were processed by conditional analysis, producing landslide susceptibility maps with five susceptibility classes. A comparison between the distribution of landslides after 1975 and those derived from models provided the predictive power of each model, which in turn was used to define the best predictive model. Reduced chi-square analysis allowed to define the efficiency of MSUE as dependent variable representation. MSUE can be applied as dependent variable representation to landslide susceptibility zonation with appreciable results. In the Roglio basin, slope angle, distance from streams, and from tectonic lineaments proved to be the main controlling factors of translational slides, whereas in the Milia basin, lithology and slope angle gave more satisfactory results as landslide-predisposing factors
Does joining social media groups help to reduce students’ dropout within the first university year?
No full textUsing observational data, the aim of our study paper was to investigate whether university students’ dropout within the first year is influenced by participation in social media groups such as Facebook pages created and run by other students. Specifically, in this paper such participation is considered as a treatment and represents a means to help promote and strengthen social relationships amongst students but also to help share information on courses and other material useful for studying and preparing for exams. For this purpose, data from a sample survey of students enrolled in a major Italian university were used. Given a non-random treatment assignment, analysis was carried out using propensity score matching (PSM) in order to correct for selection bias due to a set of observable pretreatment covariates. Several matching techniques and sensitivity analyses suggested that the results were robust for estimating an average treatment effect on the treated group. The estimated effect indicated that participation in social media groups is effective for lowering the dropout rate
Analysis of Graduates' Assessments on University Effectiveness in Presence of Missing Data and Outlier Observations
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