1,721,106 research outputs found
Nuove frontiere di ricerca: gli estremophilous bacteria nelle infrastrutture stradali. Possibilità di impiego del bacillus pausterii ATCC 6453.
No full textEstremophilous bacteria for achieving cohesive strength in the aggregates for unbound layers of road pavements
No full textEffects of the microbial mineral plugging in the unbound layers of road construction. A mathematical model of simulation of the fatigue phenomenon in biologically treated pavements.
No full textPrime esperienze sul trattamento biotecnologico dei materiali non legati nelle sovrastrutture stradali.
No full textB.U.L.M. Technique for increase of the bearing capacity in the pavement layers subjected to biological treatment
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Exploring wider well-being in the EU-15 countries: an empirical application of the Stiglitz report
No full textWe draw on the recommendations of the Stiglitz Report to select a set of economic and social variables that can be used to make cross-country comparisons of wider well-being. Using data for the EU-15 countries for 1999 and 2005, we show how three-way analysis can be used to extract synthetic information from a large data set to determine the main latent explanatory factors. In our case, we identify one dominant factor that we term the development profile, which is positively associated with the level of education outputs, technological progress and female labour market participation and negatively associated with the level of pollution. We rank the countries according to this factor and compare these rankings with simpler GDP comparisons and find that the two rankings are only weakly correlated
Teachers’ perceptions of the effectiveness of teaching Geosciences in Italian upper secondary school
Full text linkEarth Sciences teaching should play a primary role in the educational system to train citizens with the geoscientific Literacy in order to make conscientious and sustainable decisions. However, studies have shown that this discipline in the last years has suffered a significant decline in the international and Italian school systems. Therefore, a survey was conducted among a sample of 60 Sicilian high school teachers between April and June 2022, in order to find out how they perceive the quality of Geosciences teaching and what they need to teach this discipline more effectively. The critical aspects in Geosciences teaching emerged from the survey have been summarised in four points: the number of hours devoted to Geosciences; the teachers’ specific academic background; teacher training; the didactic-organisational structure of the Geosciences curriculum. The results of this survey could contribute: (i) to encourage the use of inductive didactic approaches in order to improve the quality of the teaching-learning process; (ii) to provide foods for thought for the designing of Earth Sciences curriculum in the Italian secondary school; (iii) to stimulate a wider educational training offer of Geosciences. Some considerations emerged from the analysis of the questionnaire answers can be generalised to the national situation. Despite the limited extension of the sample, the survey represents a first attempt to focus on the situation of Earth Sciences in Sicilian school and to raise the interest of the academic geological community and the educational authorities for the point of view of teachers
Capturing gypsum rillenkarren morphometry by a 3D-photo reconstruction (3D-PR) technique
No full textRillenkarren are small scale, straight, narrow solution channels that head at the crest of a bare rock slope and are extinguished downslope. In this paper the applicability of 3D-photo reconstruction technique of the rock surface is proposed for capturing the rillenkarren morphometry on gypsum. At first, the measurements are used to assess a relationship between the width/depth ratio and the depth of the rillenkarren. The exponent of this power relationship resulted different from the theoretical value - 0.5, confirming that the cross-section profiles of a rillenkarren can have a shape different from parabolic. The analysis developed for the cross-section area, the perimeter and the hydraulic radius established that the formation process is able to deep and enlarge the channel. The proposed model of the measured longitudinal profiles confirmed that the profile shape can be characterized by a flex point which divide the upstream concave part from the downstream convex one. According to previous studies on soil erosion features (rills, ephemeral gullies and gullies) the relationship between the rillenkarren length and its volume was expressed by a power equation. The comparison between rillenkarren and soil erosion features allowed to conclude that a single exponent (equal to 1.1) can be applied while the coefficient is characteristic of the feature and represents the influence of channel depth and width. Finally a model of rillenkarren morphometry, deduced applying the dimensional analysis and self-similarity, was applied to the measurements. This analysis demonstrated that a single dimensionless relationship is applicable to rillenkarren and rills, ephemeral gullies and gullies, assessing that a morphometric similarity exists between these different erosion features
Il carsismo nei gessi della Sicilia occidentale
No full textViene proposto un itinerario che consente di osservare alcune delle aree carsiche gessose più significative dell’intero Bacino del Mediterraneo per la eccezionale varietà e ricchezza di morfologie carsiche sia superficiali che sotterranee in esse presenti. L’itinerario si sviluppa in Sicilia occidentale e centro-meridionale e si articola in tre percorsi che possono essere realizzati in tre giorni, attraverso l’utilizzo dell’auto e tratti a piedi. Alcune delle aree, per la loro valenza scientifica e paesaggistica, costituiscono delle riserve naturali, istituite dalla Regione Sicilia, e/o Zone Speciali di Conservazione (ZSC) e Zone di Importanza Comunitaria (SIC)
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