Search results for "Tier"
showing 10 items of 968 documents
Caratterizzazione mediante spettroscopia NMR in fase solida di foglie e lettiera di quattro essenze forestali
2008
La velocità di degradazione del materiale vegetale che arriva al suolo dipende dalle caratteristiche chimico-fisiche dei residui che ne influenzano l’appetibilità e, dunque, la facilità con cui i microrganismi li degradano. Molti studi hanno evidenziato come elevate percentuali di lignina e di composti polifenolici possano limitare l’attività dei microrganismi, in quanto poche specie microbiche hanno un apparato enzimatico completo per la degradazione dei suddetti polimeri. Obiettivo del presente lavoro è l’analisi, tramite spettroscopia NMR in fase solida (CPMAS 13C-NMR), della composizione molecolare delle foglie e della relativa lettiera di 4 essenze forestali: Eucaliptus occidentalis En…
Sectoral Transformations in Neo-Patrimonial Rentier States: Tourism Development and State Policy in Egypt
2007
This article challenges claims that liberalising state regulated markets in developing countries may induce lasting economic development. The analysis of the rise of tourism in Egypt during the last three decades suggests that the effects of liberalisation and structural adjustment are constrained by the neo-patrimonial character of the Egyptian political system. Since the decline of oil rent revenues during the 1980s tourism development was the optimal strategy to compensate for the resulting fiscal losses. Increasing tourism revenues have helped in coping with macroeconomic imbalances and in avoiding more costly adjustment of traditional economic sectors. Additionally, they provided the p…
Feces production as a form of social immunity in an insect with facultative maternal care
2015
Background Social animals have the unique capability of mounting social defenses against pathogens. Over the last decades, social immunity has been extensively studied in species with obligatory and permanent forms of social life. However, its occurrence in less derived social systems and thus its role in the early evolution of group-living remains unclear. Here, we investigated whether lining nests with feces is a form of social immunity against microbial growth in the European earwig Forficula auricularia, an insect with temporary family life and facultative maternal care. Results Using a total of 415 inhibition zone assays, we showed that earwig feces inhibit the growth of two GRAM+ bact…
Early assessment of crop yield from remotely sensed water stress and solar radiation data
2018
Soil moisture (SM) available for evapotranspiration is crucial for food security, given the significant interannual yield variability of rainfed crops in large agricultural regions. Also, incoming solar radiation (Rs) influences the photosynthetic rate of vegetated surfaces and can affect productivity. The aim of this work is to evaluate the ability of crop water stress and Rs remotely sensed data to forecast yield at regional scale. Temperature Vegetation Dryness Index (TVDI) was computed as an indicator of crop water stress and soil moisture availability. TVDI during critical growth stage of crops was calculated from MODIS products: MODIS/AQUA 8-day composite LST at 1 km and 16-day compos…
Translations, versions and commentaries on poetry in the 15th- and 16th centuries
2020
This article introduces the monograph “Translations, versions and commentaries on poetry in the 15th- and 16th centuries”, which includes four studies dealing with translations from vernacular to vernacular, of works by Dante, Petrarch, Alain Chartier and Jan van der Noot.
Trench-parallel spreading ridge subduction and its consequences for the geological evolution of the overriding plate: Insights from analogue models a…
2018
A series of 3-D asthenospheric-scale analogue models have been conducted in the laboratory in order to simulate the arrival of a spreading ridge at the trench and understand its effect on plate kinematics, slab geometry, and on the deformation of the overriding plate. These models are made of a two-layered linearly viscous system simulating the lithosphere and asthenosphere. We reproduce the progressive decrease in thickness of the oceanic lithosphere at the trench. We measure plate kinematics, slab geometry and upper plate deformation. Our experiments reveal that the subduction of a thinning plate beneath a freely moving overriding continent favors a decrease of the subduction velocity and…
Physico-chemical evolution of low-pH cements : influence of the temperature and the retention mechanisme of alkalins
2010
Because of their high alkalinity, Portland cement (OPC)-based materials may have deleterious effects in an underground waste repository. A solution would be to use low-alkalinity cements (also referred as low-pH cements) generating interstitial solutions with a reduced pH (11 instead of 13.5 for OPC), and thus showing an improved chemical compatibility with the repository environment. In this work, the investigated formulations were based on binary (OPC / silica fume) or ternary (OPC / silica fume / slag or fly ash) blends, with high substitution levels of CEM I (from 30% to 80%). This research project met two main objectives: (i) study the chemical evolution of low-pH cements at 50°C or 80…
Desarrollo de un modelo de evapotranspiración global con datos de satélite y de re-análisis
2021
La cuantificación de la evapotranspiración (ET) es fundamental para el estudio de los procesos hidrológicos, caracterización climática y agronómica, así como para la aplicación en modelos de cambio climático, y la gestión de los recursos hídricos. Cabe destacar, la importancia del conocimiento de este parámetro en el control de inundaciones y sequías, en la planificación de obras de infraestructura, entre otras. Los factores que intervienen en el proceso de ET son diversos, variables en el tiempo y en el espacio, por lo tanto, cobran relevancia los datos de satélite, debido a que con ellos se puede obtener una variación espacio-temporal de los componentes del ciclo hidrológico a diferentes …
NEW FRONTIERS OF ROBUST DESIGN WITH APPLICATION TO MOTORCYCLES.
2012
Gli studi machiavelliani di Alphonse Dantier ne "Le Correspondant"
2011
From September 1871 to July 1873 Alphonse Dantier (1810-1882) published, for the prestigious magazine of liberal Catholic inspiration, Le Correspondant, some contributions on the history of Florence, The Medicis and Machiavelli, collected in 1874 in the second volume of his work L’Italie: études historiques for which he was awarded the prize of the Académie Française Marcelin Guérin. Dantier, although anchored to the simplified cliché of Machiavelli “negative genius”, perceived the historiographical talent of the author of Historie fiorentine and contributed to introduce the French Catholic reader to the commitment of the Republican Machiavelli in the sixteenth-century, documenting it throu…