1,721,342 research outputs found
Translate IT Governance framework into practice: the role of IT Service Management and Performance evaluation
No full textIl Remote-Sensing per lo Studio Geomorfologico e Geoarcheologico di Zone Aride
No full textThis work uses satellite data to detect palaeofluvial traces in arid and semiarid areas. The studies cover three places with archaeological evidences useful to date the palaeoenvironmental changes.
In Wadi Tanezzuft (Libya) the absence of vegetation allows using satellite imagery to detect geological features. The band ratios on multispectral data (Landsat, ASTER) put in evidence the presence of fine sediment in palaeolakes and alluvium, iron-oxides in palaeodunes and desert varnish on palaeosurfaces. The single palaeofluvial bars can be seen in high resolution imagery (SPOT, PRISM, Ikonos) while the gravel belt representing the palaeoriver’s bed is better visible in L-band radar data (PALSAR). The digital elevation model (SRTM DEM) is used to delimitate the hydrological basin and identify the structural depression.
In the area of Tell Beydar (Syria), the DEM is useful to detect tells (artificial mounds with archaeological significance) end extract hydrographical network. A method to clean the vertical errors in the DEM is proposed and the comparison with fluvial traces recognized on satellite imagery (SPOT and DOI) allows seeing the improvements brought by the cleaning procedure.
On the Murghab fluvial fan (Turkmenistan), the DEM shows the relief of many palaeofluvial ridges associated with archaeological site and it allow studying the features in the mountain basin; curvature and slope parameters identify badlands forms developed on friable terrains
Patterns of land use and settlements in the surroundings of Sumhuram : an intensive geo-archaeological survey at Khor Rori: report of field season February 2006
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MODELLING NITROGEN DYNAMICS IN CROP AND SOIL: FROM SITE-SPECIFIC TO REGIONAL APPLICATION IN NORTHERN ITALY.
Full text linkThe aim of my Ph.D. work was to investigate the main factors related to N leaching from arable land under different pedoclimatic conditions and cropping systems in Lombardia plain. In situ monitoring and modelling analysis were defined to evaluate the potential N losses via leaching from arable land and the effect of agricultural management. At monitoring sites, representative of Lombardia arable land, data of soil, crop, water, and N-related variables were collected for a period from 2 to 5 years. Soil characterization, crop yield, leaf area index, harvest index, crop nitrogen uptake, soil water content and soil solution nitrogen concentration at different depths were measured over the monitoring period.
All the collected data were used to calibrate and validate the ARMOSA model. Such dynamic model was developed by our research team to predict N leaching risk from arable land in northern Italy. The calibration and validation procedures allowed to parameterize (i) pedological parameters related to soil water balance and nitrogen dynamics, such as mineralization, denitrification, volatilization, wet and dry atmospheric deposition, immobilization; (ii) six crops growth and development parameters which lead the gross assimilation of CO2, leaf area index, stem and root elongation, respiration loss, nitrogen dilution curve, crop development based on growing degree days, dry matter partitioning, evapotranspiration and residuals calculation. The outstanding result was that crop, water and N-related variables were accurately simulated, being in full agreement with observed data.
Once calibrated and validated, ARMOSA model was applied at regional scale in order to evaluate the potential risk of N leaching. The model run over 20 years in 35 simulation units, obtained by dividing Lombardia plain in homogenous districts in terms of pedological, climatic and cropping systems features. Each district was characterized by two representative soil types, meteorological observed data set, crop rotations according to the regional land use analysis, organic N load, calculated on the basis of livestock density.
With regard to results, similar or even higher N use efficiency resulted with increasing organic N supply and proportionally reduced mineral fertilization. In such way, N leaching decreased by half in maize-based forage systems. Moreover, the eventual choice to introduce a catch crop in rotation strongly contributed to minimize N leaching
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Modelling nitrogen leaching from sewage sludge application to arable land in the Lombardy region (northern Italy)
No full textSewage sludge can be used as fertiliser, offering the possibility of safely recycling this waste product as a resource in agricultural applications. As the environmental concerns related to waste recycling in agricultural applications are well-known, restrictions on the use of sewage sludge have been implemented by the EU and local authorities. This work aimed to evaluate the nitrogen leaching associated with the application of sludge and the effectiveness of the temporal restrictions on its application implemented to safeguard the environment in the Lombardy region of northern Italy (120days in Nitrate Vulnerable Zones and 90days elsewhere) using the CropSyst model which was first validated. The effects of fertilisation using four different sludge types on N leaching were simulated at five sites under cultivation with maize and rice crops; six different timing schemes for sludge application were tested, three of which involved dates that were in agreement (AT) with the regulation, while the other three were not in agreement (NAT). We detected a significant effect of the sludge type and application timing, whereas the effect of their interaction was never significant. The mean annual leaching was 22 to 154kgNha-1. The higher the ammonium N content in the sludge was, the greater the potential for N leaching was found to be. For the maize crop, the distribution of sludge in the late fall period resulted in significantly greater N leaching (61kgNha-1) and led to lower yields (9t DMha-1) compared to late winter fertilisation (49kgNha-1; 10t DMha-1), whereas no differences in N leaching or yield were detected between AT and NAT, which was also observed for the rice crop. Therefore, the applied temporal constraints did not always appear to be advantageous for protecting the environment from leaching
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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