89,469 research outputs found
Ezio Pellizer, in M. Iodice, R. Spataro (eds.), Dizionario dei grecisti italiani del XX secolo, Istituto Italiano di Studi Classici, Roma
No full textFrom gridmap-file to VOMS: managing Authorization in a Grid environment
No full textFrom gridmap-file to VOMS: managing authorization in a Grid environment R. Alfieri, R. Cecchini, V. Ciaschini, L. dell’Agnellod, A. Frohner, K. Lorentey, F. Spataro Future Generation Computer Systems 21 (2005) 549–558 doi:10.1016/j.future.2004.10.006 Abstract Grids are potentially composed of several thousands of users from different institutions sharing their computing resources (or using resources provided by third parties). Controlling access to these resources is a difficult problem, as it depends on the policies of the organizations the users belong to and of the resource owners. Moreover, a simple authorization implementation, based on a direct user registration on the resources, is not applicable to a large scale environment. In this paper, we describe the solution to this problem developed in the framework of the European DataGrid [M. Draoli, G. Mascari, R. Piccinelli, Project Presentation, DataGrid-11-NOT-0103- 1] and DataTAG [http://www.datatag.org/] projects: the Virtual Organization Membership Service (VOMS) [R. Alfieri, et al., Managing Dynamic User Communities in a Grid of Autonomous Resources, TUBT005, in: Proceedings of the CHEP 2003, 2003]. VOMS allows a fine grained control of the use of the resources both to the users’ organizations and to the resource owners
Rezension von Domenico di Caleruega alle origini dell’Ordine dei Predicatori. Le fonti del secolo XIII. Hrsg. von G. Festa, A. Paravicini Bagliani, F. Santi (= Millennio Medievale 121. Testi 33). Firenze: SISMEL Edizioni del Galluzzo 2021. LII + 1188 S.
No full textRecension to Domenico di Caleruega alle origini dell’Ordine dei Predicatori. Le
fonti del secolo XIII. Hrsg. von G. Festa, A. Paravicini Bagliani, F. Santi (= Millennio Medievale 121. Testi 33). Firenze: SISMEL Edizioni del Galluzzo 2021. LII + 1188 S
New aspects about the chemistry of nitrogen compounds in atmospheres with different degrees of air pollution.
No full textDifferent susceptibility of local Apulian and Calabrian grapevines to downy mildew and characterization of Plasmopara viticola populations
No full textDowny mildew, a severe grapevine disease worldwide, is caused by different cryptic species of Plasmopara viticola. Several approaches are under study to reduce the impact of chemicals in the disease management, including the selection of resistant genotypes for grapevine breeding. In this study, the susceptibility of six different local wine grape cultivars was assessed on leaves and bunches, in 2023, an year particularly favourable to the downy mildew epidemy. Based on McKinney's index (MKI: 37.3 to 52.6%), Marchione, Moscato reale, Maresco and Moscato di Terracina were more susceptible than Moscato di Trani, Trebbiano and Verdeca, classified as resistant ones (MKI: never exceeding 16.6%). Additionally, the genetic variability of P. viticola populations infecting grapevine in Apulia, Calabria and Lombardia was evaluated. Sporangia were collected from oil-spots in 26 vineyards (15 Apulia, 11 Calabria), during 2023 and 2024 years. The CAPS analysis was carried on restriction enzyme AseI profiles of the amplified DNA using the ITS1-O/ITS2, according to Rouxell et al. (2013). A total of 130 isolates and 20 DNA samples from oil spots sampled in Lombardia were analysed. All belong to the clade aestivalis, as also confirmed by BLASTn analysis of the ITS partial sequence of few representative isolate of Apulia and Calabria regions. These preliminary results suggest that the resistant behaviour of analysed grapevine genotypes is limited to P. viticola clade aestivalis and highlight the opportunity to preserve the local biodiversity for possible introduction of new P. viticola clades, currently absent
Il contributo di sorgenti locali sull'impatto ambientale da Diossine e Furani
No full textPolychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are ubiquitous contaminants, mainly released into the environment during combustion processes (point sources), but also from other sources (traffic, waste incinerators, uncontrolled combustion). This Ph.D. thesis is aimed to investigate the contribution of a steel plant in NW Italy (700 000 tons of steel/year) to the air concentrations and the deposition fluxes of PCDDs/PCDFs at local level, through the analysis of measured, modelled and literature data. The investigation on PCDD/F air concentration was carried out in an area of 600 km2, using air quality data measured by the institutional monitoring network, data obtained from AERMOD simulations and literature data. The measured air concentrations were consistent with literature values for similar areas, and both the homologue profiles and PCA analyses showed a clear distinction between the monitoring stations and the source profiles. All the previous results were also confirmed by the air dispersion model (AERMOD), that predicted PCDD/F air concentrations due to the steel plant from four to two orders of magnitude lower than those measured in the monitoring stations, highlighting the presence of other sources. AERMOD is one of the most used models for estimating ambient air pollution concentrations; it is a steady-state, plume dispersion model developed by the US Environmental Protection Agency (EPA). The investigation on PCDD/F deposition fluxes was carried out in an area of a 420 km2 area surrounding the plant. Total measured deposition fluxes of PCDD/Fs were consistent with other studies carried out in Italy in urban and suburban areas and in rural European areas; while these were lower than those measured in other European urban/suburban areas or in sites influenced by industrial sources. Furthermore, the measured deposition fluxes were also compared with the pattern of PCDD/Fs in ambient air sampled at the same sites in the previous part of the study. This comparison showed a similarity between air concentration and deposition patterns and a clear distinction from the source. The study was completed with AERMOD simulations, that calculated deposition fluxes of two or three orders of magnitude lower than those measured in two of the three monitoring points; while the model was not able to calculate the deposition fluxes in the most distant monitoring station, because they were under the limit of sensitivity of the model itself . This results confirmed that the unexposed sampling site was not subject to emissions from the steel plant. In conclusion, this study outlines the limited influence of the source in the local PCDD/F both air concentrations and deposition fluxes and at the same time the usefulness of a joint analysis of measured, literature and calculated data to correctly evaluate the role of a source to the local pollution. The study also highlights the usefulness of AERMOD as a complementary tool to define the correct placement of monitoring stations and to locate those areas expected to have the highest air concentrations deriving from a sourc
T-wave and heart rate variability changes to assess training in world-class athletes
No full textPURPOSE: A decrease of electrocardiographic T-wave voltage with increasing training loads has been reported in elite endurance athletes and ascribed to training-related adaptation in sympathetic activity to the ventricles. A switch from vagal to sympathetic predominance in sino-atrial node regulation on going from low to peak training load has been reported in world-class rowers. In this study on world-class endurance athletes, we tested the hypothesis that training-induced variations in T-wave amplitude at higher training loads are paralleled by changes in HR spectral profile. METHODS: We studied eight male rowers of the Italian national team in the season culminating with the Rowing World Championship. Athletes were evaluated at 50 and 100% of training load, approximately 20 d before the World Championship, and during the World Championship, when the intensity was markedly reduced. We assessed T-wave maximum amplitude in chest lead V6 and cardiac autonomic regulation by power spectral analysis of R-R interval variability. RESULTS: The increase in training load from 50 to 100% was accompanied by a significant decrease in high frequency and a significant increase in low-frequency R-R variability (in normalized units) with a concomitant significant decrease in T-wave amplitude (microV). Reduction in training load during the World Championship resulted in a return of spectral profile to the level observed at 50% training load and in a partial recovery of T-wave amplitude. HR did not change significantly. CONCLUSIONS: In high-performance world-class athletes, training load simultaneously affects both ventricular repolarization and HR variability patterns possibly through variations in cardiac sympathetic modulation to the ventricles and the sino-atrial node. Information on concomitant changes in ventricular repolarization and autonomic cardiac regulation might be employed to tailor training protocols of elite athletes
I risultati della 10a Conferenza delle parti e il ruolo italiano nella tutela dell'agrobiodiversità.
No full textPropuesta de mejora de manufactura lean para las líneas de producción de confección de camisería de Spataro Napoli S. A.
No full textSpataro Napoli S. A. es una empresa colombiana fundada en 1967 por el señor Humberto Spataro, dedicada a la fabricación, venta y distribución de camisería inglesa. Con más de 600 empleados, la empresa se enfoca en la producción de camisería, exportando el 45% de su producción. Actualmente enfrenta desafíos en su sistema de producción en cadena, lo que ha generado la necesidad de implementar Lean Manufacturing para mejorar la productividad y la cultura organizacional. Esta metodología no solo busca optimizar la producción, sino también influir en toda la cadena de suministros y en la cultura empresarial. El objetivo es mitigar las brechas existentes y generar un cambio tanto estructural como cultural en la empresaSpataro Napoli S.A is a Colombian company founded in 1967 by Mr. Humberto Spataro, dedicated to the manufacture, sale and distribution of English shirting. With more than 600 employees, the company focuses on the production of shirts, exporting 45% of its production. It currently faces challenges in its chain production system, which has generated the need to implement Lean Manufacturing to improve productivity and organizational culture. This methodology not only seeks to optimize production, but also influence the entire supply chain and business culture. The objective is to mitigate existing gaps and generate both structural and cultural change in the company.Tabla de ilustraciones --
Lista de cuadros --
Anexos --
Lista de anexos --
Glosario --
Resumen --
Palabras claves --
Abstract --
Introducción --
1. Capítulo 1. Área problemática --
1.1. Identificación del problema --
2. Capítulo 2. Objetivos --
2.1. Objetivo general --
2.2. Objetivos específicos --
3. Capítulo 3. Justificación --
4. Capítulo 4. Marco de referencia --
4.1. Marco teórico --
4.1.1. Mejora --
4.1.2. Lean manufacturing --
4.1.3. Herramientas Lean --
4.1.4. Proceso de flujo lean manufacturing --
4.1.5. Lean Manufacturing 4.0. --
4.1.6. Indicadores de productividad --
4.2. Marco contextual --
5. Capítulo 5. Metodología --
5.1. Tipo de trabajo --
5.1.1. Tipo de investigación --
5.1.2. Diagnóstico de la situación actual en el proceso de confección de camisería en Spataro Napoli --
6. Capítulo 6. Resultados --
6.1. Diagnóstico de la situación actual en el proceso de confección de camisería Spataro Napoli --
6.2.1. Descripción del proceso --
7. Capítulo 7. Diseño de propuesta de lean manufacturing --
7.1. Materiales --
7.2. Mano de obra --
7.3. Método --
7.4. Medio ambiente --
7.5. Mantenimiento y maquinaria --
8. Capítulo 8. Simulación de piloto de la línea 7 de confección basada en Manufactura lean --
9. Capítulo 9. Medición de indicadores de productividad y desempeño --
10. Conclusiones --
11. Referencias.Pregrad
Rate of Growth of Population and Aggregate Saving in the Basic Life-Cycle Model
No full textIn this paper we explore the impact of the life-cycle dynamics of family composition on the aggregate propensity to save and on the relationship between the latter and the rate of growth of population, in the hypothesis of life-cycle behaviour. We depart from Modigliani-Brumberg’s basic model by assuming that the household, rather than the individual, is the relevant economic unit. In this framework we point out that in an economy with a steadily growing population the aggregate propensity to save is a function of several demographic parameters and, in particular, of the timing of births (T) and of the number of children generated by each household (f). We then explore the impact of T and f on the co-movements of the rate of growth of population and of the aggregate propensity to save. We show that, when the change of the rate of growth of population is brought about by a change of the number of children generated by each household, the aggregate propensity to save and the rate of growth of population move in the same direction, as suggested by Modigliani-Brumberg, unless the timing of births is very low and the number of children generated by each household relatively high. On the contrary, when the rate of growth of population changes because the timing of birth changes, the aggregate propensity to save and the rate of growth of population move in opposite directions unless the number of children generated by each household is very close to two and therefore the rate of growth of population very close to zero
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