Search results for "AMBIENTE"
showing 10 items of 1727 documents
Recover and reutilization of waste matter of coffee preparation. An experiment for Environmental Science Course
2001
This work is designed as an experience for organic and analytical chemistry laboratories involved in environmental science courses. It achieves the following goals: 1. It shows that environmental samples are not homogeneous (1). 2. It is possible to build up students’ confidence in manipulating everyday matter when they are beginning to study scientific subjects and to introduce some methods of sample preparation in analytical chemistry. 3. It demonstrates some fundamental analytical principles (acid–base and redox analysis, solid–liquid and liquid– liquid extraction, etc.). 4. It shows the importance of instrumental analysis, such as gas chromatography, atomic absorption spectroscopy and e…
Preliminary study on analysis and removal of wax from a Carrara marble statue
2015
This preliminary study has mainly focused on the wax identification by nuclear magnetic resonance (NMR) and removal. Wax is used for many purposes in the field of art as protective coatings on wooden, stone or metal objects. From the comparison of the spectra H NMR and in particular with the correspondence of the resonance peaks of the samples taken from the statue and beeswax and paraffin, we can conclude that the wax applied on the statue surface is beeswax. From our data, it can be concluded that, to remove the beeswax, from any stone support, the more effective solvent is the mixture of cyclohexane/ethyl acetate. The removal percentages ranged from 19 to 99%. Lower percentages of remova…
Hydroxypropyl Cellulose Films Filled with Halloysite Nanotubes/Wax Hybrid Microspheres
2021
The design of novel nanocomposite films based on hydroxypropyl cellulose (HPC) and wax/halloysite hybrid microspheres has been reported. In particular, we first prepared wax/clay Pickering emulsions which were characterized by thermogravimetric analysis and microscopy. SEM images allowed more detailed insights on the nanotubes disposition at the wax/water interface, acting as an outer stabilizing shell. Therefore, the cellulosic biopolymer was added, and it was found that HPC enhances the colloidal stability of the particles, preventing their coalescence and sedimentation. The preparation of the composite films was carried out by the solvent casting method, which enabled the development of …
Palermo Arabo-Normanna e le cattedrali di Cefalù e Monreale (due volumi)
2018
Dossier e Piano di Gestione per l'iscrizione, nella W.H.L. UNESCO di: Palermo arabo-normanna e le cattedrali di Cefalù e Monreale, W.H.L. La Palermo arabo-normanna mantiene viva la memoria di una città aperta, multietnica, riflesso e manifestazione di un sincretismo culturale che, nei secoli, l’ha resa unica e meritevole di essere custodita, valorizzata e riconosciuta come un autentico “gioiello”, patrimonio dell’umanità. Tra i monumenti arabo-normanni presenti nel sito UNESCO, ne sono stati selezionati nove che preservano in modo pressoché integrale le componenti architettoniche e decorative. Si tratta infatti delle opere più rappresentative e artisticamente rilevanti nelle quali è possibi…
Laboratory of X-ray Fluorescence (XRF)
2020
In this laboratory activity, the X-ray Fluorescence Spectroscopy technique is introduced. The goal of the laboratory is to show to the students the theory and the applications of the above technique in the field of underwater archaeology. After a brief introduction about the theory and the instrumentations, some case studies are showed. The students thus see the practice application of the portable XRF Tracer III SD Bruker AXS spectrometer having a Rhodium tube as an X-ray generator and a silicon drift XFlash ® with Peltier cooling system as a detector to some finds saved at the Museo Archeologico Antiquarium ex Stabilimento Florio delle tonnare di Favignana e Formica. The identification of…
El contacte entre la Ribera del Xúquer i els raiguers de les Muntanyes de Carcaixent
1985
Cuando el río Xúquer llega a la Ribera, deja el encajamiento montañoso y forma un cono aluvial que ent ra en contacto con los piedemontes originados por los relieves emergidos en las cercanías de la llanura de inundación, apareciendo unas zonas deprimidas en el punto de contacto de las dos formaciones por los perfiles opuestos que presentan. Además, el contacto no es estable debido a la diferente velocidad de crecimiento en altura, y en consecuencia los depósitos fluviales conquistan poco a poco las tierras de piedemonte y por lo tanto, la zona deprimida se aleja cada vez más del río. En segundo lugar, los núcleos de población, que hace muchos años estaban al margen de las inundaciones por …
Identifying clouds over the Pierre Auger Observatory using infrared satellite data
2013
We describe a new method of identifying night-time clouds over the Pierre Auger Observatory using infrared data from the Imager instruments on the GOES-12 and GOES-13 satellites. We compare cloud. identifications resulting from our method to those obtained by the Central Laser Facility of the Auger Observatory. Using our new method we can now develop cloud probability maps for the 3000 km(2) of the Pierre Auger Observatory twice per hour with a spatial resolution of similar to 2.4 km by similar to 5.5 km. Our method could also be applied to monitor cloud cover for other ground-based observatories and for space-based observatories. (C) 2013 Elsevier B.V. All rights reserved.
Harnessing the biodiversity value of Central and Eastern European farmland
2015
A large proportion of European biodiversity today depends on habitat provided by low‐intensity farming practices, yet this resource is declining as European agriculture intensifies. Within the European Union, particularly the central and eastern new member states have retained relatively large areas of species‐rich farmland, but despite increased investment in nature conservation here in recent years, farmland biodiversity trends appear to be worsening. Although the high biodiversity value of Central and Eastern European farmland has long been reported, the amount of research in the international literature focused on farmland biodiversity in this region remains comparatively ti…
Elemental and Lead Isotopic Data of Copper Finds from the Singen Cemetery, Germany – a Methodological Approach of Investigating Early Bronze Age Netw…
2011
International audience
L'accordo in materia di ambiente
2008
Il concetto di «accordo ambientale» copre una vasta area fenomenica di non facile definizione e classificazione che va dall’impegno unilaterale non giuridicamente vincolante preso da un dato settore industriale al fine di realizzare un certo obiettivo di protezione dell’ambiente, ad un vero e proprio contratto tra l’industria e l’autorità pubblica (nazionale o locale) per negoziare e fissare obiettivi di rilievo ambientale e/o modalità per la loro implementazione. L’indagine monografica sull’istituto, svolta con metodo comparitisitico e centrata sulle esperienze europee, è tesa ad illustrare tanto gli aspetti caratterizzanti l’istituto che si articolano in una area di forte ibridità tra dir…