1,721,314 research outputs found
Assessment of the climate change impact and adaptation strategies on Italian cereal production using high resolution climate data
Full text linkThe agricultural sector could suffer the impacts of climate changes projected for the coming decades with consequences varying from one region to another. Given the primary importance of wheat and maize for Italian agriculture, it is necessary to adopt the most effective adaptation strategies to climate change.The objective of this study was to evaluate the effects of the increases in atmospheric CO2 concentration on the phenology and yield of the main Italian cultivars of durum wheat, common wheat and maize at the national scale, considering the climate, soil and crop management features in each cultivation area, with and without adaptation.The CSM-CERES-Wheat and CSM-CERES-Maize crop models were calibrated and evaluated at the Italian level. The assessments of climate change impacts and adaptation strategies were made using a digital platform and high resolution climate data of two climate change scenarios related to a single climate model. The uncertainty analysis of the yield outputs associated with the different resolution of the input data was also performed.The results show increases of yield for wheat and a reduction of the maize productivity in Italy. Better results have been obtained using a fine resolution of input data. Irrigation and early sowing are the most effective adaptation strategies to climate change for wheat, while the incorporation of crop residues is an useful adaptation option for maize, especially before mid-century
"De cuando las maestras eran bravas": un apunte sobre la violencia en las escuelas
No full textDesde hace ya un tiempo el tema de la violencia en las escuelas ha ocupado el centro de la escena pública. Como en un movimiento de retroalimentación, su presencia en los medios masivos de comunicación y la preocupación y el reclamo de la opinión pública han reforzado ampliamente la circulación de discursos en torno a la necesidad de "reimponer el orden en las escuelas"...Fil: Gallo, Andrea Paola. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Humanas. Departamento de Historia. Instituto de Estudios Histórico-sociales "Prof. Juan Carlos Grosso"; . Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentin
Le dinamiche di trasporto intermodale mare-terra nella riorganizzazione delle catene logistiche e della riduzione delle esternalità negative
No full textL'attuale panorama geoeconomico e geopolitico suggerisce che le catene di approvvigionamento logistico rappresentano la spina dorsale del commercio su scala globale, caratterizzato da una rete di connessioni e interdipendenze estremamente elevata. Questa profonda integrazione ha permesso, da un lato, di migliorare l'efficienza dei flussi di trasporto e, dall'altro, ha generato sistemi caratterizzati da fragilità e vulnerabilità intrinseche. Eventi apparentemente localizzati possono ora innescare spillover su scala globale, evidenziando la fragilità sistemica di questo settore.
Tale quadro di riferimento consente di affrontare la principale domanda di ricerca, e le sue declinazioni, di questo lavoro. Come si stanno riconfigurando i sistemi logistici e di trasporto a seguito delle attuali sfide geoeconomiche, geopolitiche e ambientali?
La tesi si propone di presentare una chiave interpretativa delle complesse interazioni tra geografia, economia e politica nel panorama del trasporto integrato mare-terra, evidenziando le sfide e le opportunità che stanno emergendo in quest'epoca di profonda trasformazione.
Attraverso questa analisi multilivello e multiscalare, la tesi si prefigge di analizzare un insieme di interazioni tra trasporto marittimo e terrestre, concentrandosi sulla gestione dei flussi di traffico e sulla sostenibilità ambientale di questi processi. La ricerca esplora quattro dimensioni chiave: l'insieme delle relazioni tra ambiente e benessere economico nel quadro della Curva di Kuznets ambientale, che costituirà la base degli studi sulla sostenibilità ambientale successivamente applicati al settore dei trasporti. Successivamente, verranno esplorate le dinamiche di trasporto nel Mediterraneo in relazione alle strategie delle compagnie di navigazione; l'interconnessione tra porti e hinterland, con un focus sul trasporto ferroviario e il caso di studio del porto di Trieste; infine, per quanto riguarda la quantificazione delle emissioni di carbonio nei sistemi logistici, finalizzata a fornire indicazioni politiche per cercare di ridurre l'impatto ambientale del settore dei trasporti e della logistica. La ricerca adotta una metodologia che cerca di integrare approcci quantitativi e qualitativi in una prospettiva multiscalare. Il quadro metodologico combina strumenti della geografia economica, della cartografia tematica, dell'analisi delle reti e dei retroterra e dell'analisi della ripartizione dei turni nel contesto della logistica e dei porti. In particolare, l'approccio utilizzato nel primo capitolo mira a comprendere l'evoluzione del traffico portuale in relazione alle strategie di investimento delle compagnie di navigazione e alle principali funzioni portuali. Il secondo capitolo utilizza l'analisi spaziale per esaminare le relazioni porto-porto-hinterland, anche in relazione alle infrastrutture ferroviarie, mentre il terzo capitolo propone di sviluppare uno strumento standardizzato per il calcolo dell'impronta di carbonio della logistica e di applicarlo a casi di studio reali relativi all'area del Mediterraneo.The ongoing geoeconomic and geopolitical landscape suggests that logistics supply chains represent the backbone of trade on a global scale characterized by an extremely high network of connections and interdependencies. Such deep integration has, on the one hand, allowed for improved efficiency of transport flows while, on the other, it has generated systems characterized by intrinsic fragility and vulnerability. Seemingly localized events can now trigger spillover effects on a global scale, highlighting the systemic fragility of this sector.
Such a framework paves the way for the main research question, and its declinations, this work is addressing. How are the logistic and transport systems reconfiguring following the current geoeconomic, geopolitical and environmental challenges?
The thesis aims to provide an interpretive key to the complex interactions between geography, economics and politics in the integrated sea-land transportation landscape, highlighting the challenges and opportunities that are emerging in this era of profound transformation.
Through this multilevel and multiscalar analysis, this dissertation aims to analyze a set of interactions between maritime and land transport, focusing on the management of traffic flows and the environmental sustainability of these processes. The research explores fours key dimensions: the set of relationships between environment and economic well-being in the framework of the Environmental Kuznets Curve, which will be the foundation of the environmental sustainability studies later applied to the transport branch. Subsequently, the transport dynamics in the Mediterranean in relation to shipping company strategies will be explored; the interconnection between ports and hinterlands, with a focus on rail transport and the case study of the port of Trieste; and finally, with respect to the quantification of carbon emissions in logistics systems aimed at providing policy guidance to try to reduce the environmental impact of the transport and logistics sector. The research adopts a methodology that seeks to integrate quantitative and qualitative approaches in a multiscalar perspective. The methodological framework combines tools from economic geography, thematic cartography, network and hinterland analysis, and shift-share analysis cast in the context of logistics and ports. Specifically, the approach used in the first chapter is aimed at understanding the evolution of port traffic in relation to shipping companies' investment strategies and major port functions. The second chapter uses spatial analysis to examine port-port-hinterland relations, including in relation to rail infrastructure while the third chapter proposes to develop a standardized tool for calculating the logistics carbon footprint and apply it to real case studies pertaining to the Mediterranean area
Microscopic zero valent silver for dye removal in wastewater
Full text linkIn the present study the removal efficiency towards dyes of microscopic metal silver, produced with a sodium borohydride reduction, was tested. In absence of stabilizers the synthesis proved to be fast, with completion in less than 5 minutes and yield of 99.7 %. The product has micrometric dimensions, while when citrate is added in the reactor particle size is reduced to 10-100 nm and stability results highly increased. The removal efficiency was tested on two dyes, Methylene Blue (MB) and Bromophenol Blue (BPB) for the micrometric particles only. Both dyes are removed in less than 1 hour, with 94 % efficiency on MB and 90 % of BPB. The promising performances shown by our material, which are very good removal efficiency and the evidence of removing the dye by degradation rather than its adsorption, suggest the possibility to overcome the health risk
posed by nanometric silver particles (AgNPs), obtaining a material which presents both catalytic and antibacterial properties plus an easier removal from the treated effluent
Electrokinetic delivery of reagents for groundwater remediation
Full text linkL'abstract è presente nell'allegato / the abstract is in the attachmen
Review of the Climate Change Resilience Measures in Port Context
No full textPorts are one of the least sustainable places in the world. Port opera- tions’ negative externalities contribute significantly to global warming, represent- ing a threat especially to human and animal communities living nearby. Simul- taneously, ports, alongside coastal areas, are starting to be seriously affected by climate change hazards, with numerous environmental and economic implica- tions. This paper investigates different climate change resilience strategies to be implemented in the port context, arguing for the importance of such action beings ports the direct stakeholders of climate change from both sides of the same coin. Through a comprehensive and organic approach, it analyses five different lines of action aimed at reducing the negative externalities of port’s operations, enhancing port’s climate resilience and protecting the surrounding environment: adaptation, mitigation, soft measures, nature-based solutions and digitalization. Finally, it explores the case study of the port of Rotterdam, an excellent example of a com- mitted port in terms of climate resilience, ultimately demonstrating the efficiency and validity of a holistic approach to climate change resilience in the port context in terms of emissions reduction and environment resilience
Análisis armónico en nilvariedades
Full text linkTesis (Doctor en Matemática)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2020.Fil: Gallo, Andrea Lilén. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Esta tesis se encuadra en el estudio del análisis armónico en pares de Gelfand de la forma (K,N), donde N es un grupo de Lie nilpotente y K es un subgrupo de automorfismos de N. En una primera parte trabajamos con una familia de pares de Gelfand (K,N) definida previamente por Jorge Lauret. Descomponemos la acción del producto semidirecto de K y N, sobre el espacio de funciones definidas sobre N de cuadrado integrable. Para estas familias, encontramos además la medida de Plancherel y la proyección sobre cada componente mediante las funciones esféricas asociadas al par. En el caso del grupo de Heisenberg se obtienen estos resultados para los pares de Gelfand asociados a cualquier K subgrupo de automorfismos del grupo de Heisenberg. Finalmente, nos avocamos al estudio de pares de Gelfand generalizados, es decir, a pares de Gelfand donde el subgrupo K no es necesariamente compacto. Un resultado clásico garantiza que si (K,N) es un par de Gelfand donde N es un grupo de Lie nilpotente y K subgrupo compacto de automorfismos de N, entonces N es a lo sumo 2-pasos nilpotente. En esta tesis, damos un ejemplo concreto de un par de Gelfand generalizado (K,N) donde N es un grupo de Lie 3-pasos nilpotente.This thesis is part of the study of harmonic analysis in Gelfand pairs (K,N), where N is a nilpotent Lie group and K a subgroup of automorphisms of N. In the first part, we work with a family of Gelfand pairs (K,N) defined by Jorge Lauret. We decompose the action of the semidirect product of K and N in the space of square integrable functions defined on N. We also find the Plancherel measure and the projection over each component by using spherical functions associated to the pair. In the Heisenberg case we obtain similar results with every Gelfand pair associated with each automorphism subgroup of the Heisenberg group. Finally, we deal with the study of generalized Gelfand pairs, i.e when K is non-compact. A classic result assures that, if (K,N) is a Gelfand pair with N nilpotent and K compact then N is necessarily 2-step nilpotent. In this thesis, we give an explicit example of a generalized Gelfand pair (K,N) where N is a 3-step nilpotent Lie group.Fil: Gallo, Andrea Lilén. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina
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