Ethylene or propylene based copolymers with higher 1-olefins by metallocene catalysts: correlation between microstrusture and properties.

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Ethylene or propylene based copolymers with higher 1-olefins by metallocene catalysts: correlation between microstrusture and properties.

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Evaluation of the environmental impact of harbour activities: problem analisys and possible solutions

A relevant problem is a main subject of this work: the pollution in ports close to inhabited zones where, due to the contemporaneous presence of many cruise ships, the contents of noxious elements in the air are excessive and the quality of life risks to become unsustainable. The impact of the operations of cruise ships in port has been analysed together with the possible consequences of their impact on the human health and the rules that attempt to reduce the effects of the pollution on it. Some possible solutions were proposed; first of all, the so called “cold ironing” consisting in a connection between the electric system of the ship and a shore system providing the ship with the electric energy to be used onboard. The major characteristics of the cold ironing were analysed together with its main problems; among them, the need of integrate this practice in a more wide scene, combining it with the microgrids in order to not to solve the problem simply by moving the production of electric energy from one site to another

Influence of Water on Tribolayer Growth When Lubricating Steel with a Fluorinated Phosphonium Dicyanamide Ionic Liquid

This work aims to elucidate the role of environmental humidity on the tribological behavior of steel surfaces lubricated with an ionic liquid comprised of a fluorinated phosphonium cation—tributyl-3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-octyl-phosphonium—and a dicyanamide anion (i.e. N(CN)2−). Ball-on-disk tribotests were carried out at room temperature and at various levels of relative humidity (RH). Water was found to be required to promote the formation of a tribofilm over the contact area. The reaction layer exhibited a patchy morphology, which resembles that observed formed with conventional antiwear additives such as ZnDTP. A surface-chemical analysis of the tribofilm indicated that the tribofilm is composed of fluorides, oxides, and phosphates, pointing to a stress-induced degradation of the ions and corrosion of the sliding counterparts, which is enabled by the presence of water at the sliding interface

Selecting molecular or surface centers in carbon dots-silica hybrids to tune the optical emission: A photo-physics study down to the atomistic level

In this work, we unveil the fluorescence features of citric acid and urea-based Carbon Dots (CDs) through a photo-physical characterization of nanoparticles synthesized, under solvent-free and open-air condi-tions, within silica-ordered mesoporous silica, as a potential host for solid-state emitting hybrids. Compared to CDs synthesized without silica matrices and dispersed in water, silica-CD hybrids display a broader emission in the green range whose contribution can be increased by UV and blue laser irradi-ation. The analysis of hybrids synthesized within different silica (MCM-48 and SBA-15) calls for an active role of the matrix in directing the synthesis toward the formation of CDs with a larger content of graphitic N and imidic groups at the expense of N-pyridinic molecules. As a result, CDs tuned in size and with a larger green emission are obtained in the hybrids and are retained once extracted from the silica matrix and dispersed in water. The kinetics of the photo-physics under UV and blue irradiation of hybrid samples show a photo-assisted formation process leading to a further increase of the relative contribution of the green emission, not observed in the water-dispersed reference samples, suggesting that the porous matrix is involved also in the photo-activated process. Finally, we carried out DFT and TD-DFT calcula-tions on the interaction of silica with selected models of CD emitting centers, like surface functional groups (OH and COOH), dopants (graphitic N), and citric acid-based molecules. The combined experimen-tal and theoretical results clearly indicate the presence of molecular species and surface centers both emitting in the blue and green spectral range, whose relative contribution is tuned by the interaction with the surrounding media

Microreti elettriche intelligenti in ambito portuale

Viene trattata la tematica dei sistemi elettrici in ambito portuale con evidenziazione dei vantaggi in termini di efficienza energetica e riduzione dell'inquinamento ambientale che le moderne tecnologie elettriche, se utilizzate, possono far conseguire. In particolare vengono evidenziate le prospettive di sviluppo, nello specifico ambito portuale, delle microreti elettriche intelligenti (Smart/Micro Grids) che integrano sistemi di cold ironing ossia di alimentazione elettrica da terra di navi in banchina. Viene quindi presentato un approccio metodologico di fattibilità di interventi energetici eco-sostenibili

Il sistema di trasporto intelligente per la logistica

La logistica delle merci per le imprese costituisce oggi uno dei campi di maggiore interesse per gli operatori istituzionali nel settore dei trasporti, sia a livello nazionale che internazionale, soprattutto perché l’evoluzione del mercato sul fronte delle esigenze trova più o meno impreparato nei vari Paesi il sistema strutturale logistico disponibile. Nel trattare i ruolo degli ITS (Intelligent Transport Systems) nelle prospettive di ristrutturazione della logistica europea e nazionale - specificamente negli aspetti della ottimizzazione delle prestazioni tecnico-gestionali dei sistemi logistici ferroviari mediante l’impiego delle tecniche basate sull’ICT (Information & Communication Technology) - la memoria intende mettere in evidenza la necessità di inquadrare l’uso delle nuove tecnologie in un contesto metodologico e progettuale diverso che in passato. Ciò è necessario sia in Europa che in Italia per la particolare complessità delle problematiche insite nella realizzazione di infrastrutture logistiche moderne e dotate di strumenti sofisticati di gestione che siano effettivamente capaci da un lato di rispondere alle esigenze attuali e future del mondo produttivo e dall’altro di collegarsi strategicamente e sinergicamente alle parallele esigenze di sostenibilità dello sviluppo territoriale e della conservazione dell’ambiente

The environmental impact of cruise ships in the port of Naples: analysis of the pollution level and possible solutions

The case study of the port of Naples is developed with particular regard to the exhaust emissions from the cruise ships which frequently berth in Neapolitan bollards, keeping most of their engines on in order to produce the electric energy needed for the auxiliary services onboard. In fact, the contemporaneous presence of four or five cruise ships may create a very dangerous environment, especially for people living close to the harbour. In the frame of a research program which involves the CNR Istituto Motori and the University of Naples “Federico II”, tests on the quality of the air were recently done; first results of this research are reported together with the analysis of the possible solutions to the problem. In this phase, the most important components of pollutants were analyzed: NOx and SO2