Search results for "Beni"

Un archivio digitale per raccontare Ustica

2022

Ustica è un pezzettino di terra nel Mediterraneo. Tutti i suoi numeri sono piccoli, quelli che ne definiscono l’area, il perimetro, l’altitudine, le distanze, gli abitanti; ma questi sono inversamente proporzionali all’importanza della sua storia, quella di una terra emersa, residuo di un esteso apparato vulcanico che vive inabissato sotto il mare. Ustica è collocata a nord-ovest di Palermo da cui dista circa 67 km, così vicina in linea d’aria da far parte della sua area metropolitana, con una superficie che copre poco meno di 9 kmq, e una popolazione, inferiore ai 1500 abitanti. Le più antiche forme di vita sull’isola risalgono al Neolitico, a cui seguirono gli insediamenti di diversi …

Percorso didattico MBC. Management dei beni culturali nel territorio di Halaesa. Un distretto turistico al confine tra due parchi?

2008

Si presentano le ragioni e le modalità di svolgimento di un percorso didattico (centrato sulle competenze manageriali) per il conseguimento di un titolo di Master di II livello in Progettazione e Gestione per la conservazione dei BB.CC.AA.; si introducono, quindi, i contenuti e i prodotti del lavoro applicativo svolto dal gruppo classe guidato da tutori e docenti dello stesso Master, nell’ambito di un protocollo di collaborazione con il Consorzio intercomunale Vallata dell’Halaesa.

Gas chromatography-mass spectrometry characterization of the varnish and glue of an ancient 18th century double bass.

2007

A GC–MS investigation is conducted on the double bass “Panormus”, property of Conservatorio di Musica “Vincenzo Bellini” in Palermo. The most important components of the varnish (fatty acids) and of the glue (proteinaceous amino acids), with which the musical instrument was treated in the past, are determined. The analyses are carried out by prior derivatization of fatty acids by acidic methanol and of amino acids by acidic methanol and trifluoroacetic anhydride (TFAA). Analytes identification is achieved by direct comparison with several reference materials and the use of a digitized library.

Voltammetric determinations of platinum and rhodium in particulate of Palermo (Italy) area

2012

Traffic has an important impact on the air quality which affects both the environmental and human health. Since the introduction of PGE-containing catalytic converters, a number studies have been undertaken to determine the effects of PGE emissions on human and to environment. This requires the development of good analytic methods to measure Pt and Rh concentrations in environmental matrices, as well to estimate background concentrations. In this paper are presented the results concerning Pt and Rh concentrations in PM10 samples collected at five stations within the urban area of Palermo. The highest mean values (Pt= 13 pg/m3, Rh=9.8 pg/m3) were recorded at an urban station, and the lowest …

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…

A FTIR study on low hydration saccharide amorphous matrices: Thermal behaviour of the Water Association Band

2011

Abstract We report a study on the thermal behaviour of the infrared Water Association Band (WAB) in dry binary saccharide–water systems (containing trehalose, sucrose, maltose, and raffinose). This is a follow-up of preceding studies on analogous carboxymyoglobin-saccharide–water ternary systems, which pointed out a mutual protein-matrix influence (coupling). A comparison between binary and ternary systems, for all the saccharides studied, evidences a reduction in the residual water content in the latter and, except for trehalose, a sizable modification in the thermal behaviour, which is discussed in terms of structure and hydrogen bonding properties of the sugars. The study allowed us also…

Protein aggregates for water purification

Water pollution is the contamination of water bodies including lakes, rivers, oceans and it is a leading global risk factor for illness and death for people, plants and living organisms. A principal source of water pollution is industry, from which increasing amounts of toxic pollutants are released including heavy metals such as cobalt, lead and copper. Today various technologies for purifying contaminated water can be applied, a lot of them being typically expensive, ion specific and characterised by low efficiency. For these reason, the search of new biocompatible materials with increased capabilities is strongly needed.Protein aggregates have already revealed their potential as environm…

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 …

Analysis and modeling of wind directions time series

2013

This work aims at studying some aspects of wind directions in Italy and supplying appropriate models. A comparison is presented between independent mixture and Hidden Markov models, which seem to be appropriate as far as the series we studied.