1,408 research outputs found
L’ordine delle parole nelle memorie di Giovanni Arrivabene
No full textInvestigated in this study are the memories of John Arrivabene (1787-1881), published for the first time in 1860 in Turin, living author, under the title “Around an era of my life”. They tell the exile of the author, who was forced to flee Italy to escape to a second imprisonment. Because the order of the words is one of the least investigated, and focuses primarily Italian contemporary, it was decided to investigate, at the level of topological syntax, three phenomena: the inversions and tmesi of the verb, the subject's position and finally, the position of the adjective. The autobiographical prose of John Arrivabene was tied to tradition in some aspects (the anteposition of adjective), tending to modernizing practice inaugurated by Foscolo in other aspects (limited sporadic use of inversions of the verb)
This paper gives an account, through examples drawn from the text, the language of the examination and the results obtained
Comunicazione di crisi e pratiche digitali di engagement: il caso della mappa condivisa SARDSOS
No full textIl capitolo affronta il tema dell'uso delle piattaforme digitali per la comunicazione di crisi e per le emergenze, mettendo in luce sia la prospettiva delle amministrazioni pubbliche, che quella dei cittadini e dei volontari digitali. In particolare, attraverso una survey online, esplora anche l'uso delle mappe condivise nell'occasione dell'alluvione dell'autunno del 2014 avvenuta in Sardegna
CROP COEFFICIENT (Kc) DETERMINATION IN SPRINKLER IRRIGATED RICE
No full textExperimental trials were carried out in Sardinia in 2002 and 2003, in order to obtain first information on kc values at different phenological stages in sprinkler irrigated rice; in 2003 the trials differed for the sowing date.
An equipment recording soil moisture content every 10 cm up to 100 cm depth was used to obtain the water balance for the first soil layers. Result analysis highlighted that the layer up to 20 cm covers about 80 % of the crop water requirements for the whole cycle.
The results show a variability particularly related to the meteorological trend during the trials. Crop coefficient ranged between 0.2 and 0.75 (estimated value) for the initial stage (Kcini), between 0.85 and 1.0 for mid season stage (Kcmid) and was 0.2 for late season (Kcend)
Roots system development in flooded and sprinkler irrigated rice cultivars
No full textOne of the most important factors to obtain high yield is a good root system development.
The exploration of a greater soil mass allows a higher water and nutrient uptake and increases crop yield. Numerous authors noticed a significant correlation between yield and root system dimension.
The growing environment, and therefore the agronomic technique, affect root system
development.
Traditionally rice is grown by flooded irrigation that, due to oxygen lack in deep soil layers, brings to a low root system deepening. In upland rice, where the growing does not take place with continuous flooding, some authors noticed a good root system development.
A comparison trial, with national and selected for upland conditions rice cultivars, was carried
out to evaluate root system development adopting both traditional flooded irrigation and sprinkler irrigation. Root density was determined by Newman method for different soil depths.
Results highlight a greater root density in flooded crop in comparison to sprinkler irrigation.
The higher yield obtained with sprinkler irrigation, even higher than flooding irrigation, suggest a greater efficiency of the root system in water and nutrient uptake in oxidized environment
Water use and crop coefficients in sprinkler irrigated rice
No full textAbstract
Field experiments were carried out during the years 2002, 2004, 2005 and 2006 to analyze water-soil-atmosphere in- teractions in sprinkler irrigated rice. The research was carried out in Sardinia (39o59’ N; 8o40’ E, at altitude 15 m). The cultivars used in the experiments, respectively in 2002 and in 2004-2005-2006, were Irat 212 and Eurosis. In each year cultivars were subjected to the same crop management. Irrigation was applied since the emergence with the sprinkler method, taking into account the loss of water from ‘Class A’ pan evaporation. Soil water content was monitored at 0.10 m intervals until 1.00-m depth using a ‘Diviner 2000’ (Sentek). In 2002 seven irrigation schedul- ing treatments were compared. In 2004, 2005, 2006 irrigation treatments provided for optimal soil water conditions during the growing season.
In 2002 the results highlighted: 1) 0-0.20 m depth was the most important layer for crop water uptake and the best correlated layer with rice rough yield; 2) the positive relationship between yield and water supply was significant until 6500 m3 ha-1 of water applied. Further seasonal irrigation volumes did not increase significantly yield. In 2004, 2005 and 2006 the analysis of the soil water balance at different crop phenological stages allowed to esti- mate crop coefficients (Kc) using the Penman-Monteith equation and the ‘Class A’ pan evaporation (Kcev).
Kc varied over the three-year period on average from 0.90 to 1.07 and 0.97, respectively for the emergence-end of tillering, end of tillering-heading and heading-maturing periods, while crop coefficients as a ratio between maximum crop evapotranspiration (ETc) and Epan, Kcev ranged from 0.78 to 0.92 and 0.81 for the same time periods
Teatro e autobiografia nell’opera di Silvio Pellico: dialoghi, ambienti e rappresentazioni di sé
No full textTimepix3 detector for measuring radon decay products
No full textThe present work is focused on the characterization of a
Timepix3 (TPX3) based test system for the identification of
particles produced by the complex decay chain of Rn. The
detector used is composed of a pixelated Cadmium Telluride (CdTe)
semiconductor (500 μm thick) bump-bonded on an ASIC TPX3
chip. Measurements were carried out at the NIXT Laboratory (ENEA
Frascati) using radioactive sources and exploiting the presence of
natural radon gas by collecting its decay products on the sensor
surface. Estimation of the radon gas risk is one of the most
important problems in radiation protection and has stimulated
further development of new advanced methods suitable for detecting
this gas in confined environments. A study of the spatial uniformity
and high energy calibration is also presented and an improved
cluster analysis is introduced. The performance highlighted in this
study will allow a detailed and faster analysis of the radon
products and may have an important impact on the environmental
radioprotection applications. This paper describes the application
and use of this test system to identify the different decay
signatures and follow the temporal evolution of the Radon decay
chain
Timepix3 detector for measuring radon decay products
No full textThe present work is focused on the characterization of a Timepix3 (TPX3) based test
system for the identification of particles produced by the complex decay chain of 222Rn. The
detector used is composed of a pixelated Cadmium Telluride (CdTe) semiconductor (500 μm thick)
bump-bonded on an ASIC TPX3 chip. Measurements were carried out at the NIXT Laboratory
(ENEA Frascati) using radioactive sources and exploiting the presence of natural radon gas by
collecting its decay products on the sensor surface. Estimation of the radon gas risk is one of the most
important problems in radiation protection and has stimulated further development of new advanced
methods suitable for detecting this gas in confined environments. A study of the spatial uniformity
and high energy calibration is also presented and an improved cluster analysis is introduced. The
performance highlighted in this study will allow a detailed and faster analysis of the radon products
and may have an important impact on the environmental radioprotection applications. This paper
describes the application and use of this test system to identify the different decay signatures and
follow the temporal evolution of the Radon decay chain
Timepix3 detector and Geant4-based simulations for gamma energy detection in Laser Produced Plasmas
No full textThe particular physics of Laser Produced Plasmas (LPP) needs some diagnostic requirements. Specifically, the X-ray monitoring of the plasma is known to be difficult since typically X-ray emissions are concentrated in bursts from a few tens of ps to few ns, based on the power and pulse time width of the laser. Therefore, the energy measurement of the radiation coming from a single experimental run is basically unfeasible using conventional techniques. Additional particles can be produced from LPP experiments, especially high energy gamma photons and electrons. As a case study in recent experiments, carried out on VEGA-2 laser facility (CLPU, Salamanca, Spain), the aim was to produce neutrons through photonuclear reactions on different types of solid targets. We have used the Timepix3 chip, in a "side-on" configuration, in order to produce a quick estimate of the gamma photons energy involved in the reactions. This detector, based on silicon, is realized with a single chip of 256 × 256 pixels bump-bonded with a 14 mm × 14 mm × 300 μm silicon layer. Interaction of gammas with the detector in this configuration produces some characteristic clusters of pixels and, for each cluster, a variety of physical and morphological parameters can be defined. Based on some of these parameters, we have characterized the detector response using some known laboratory gamma sources and the related Geant4 simulations. This allows quick energy discrimination for the gamma photons coming from different experimental runs
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