1,721,018 research outputs found
"Solid Phase Microextraction Using Fused Silica Fibers Coated with Graphitized Carbon Black"
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Fast determination of VOCs in Workplace Air by Solid-Phase Extraction and Gas Chromatography-Mass Spectrometry.
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New Assessment on CFCs Tropospheric Concentration Levels Measured in Terra Nova Bay (Antarctica)
No full textData concerning tropospheric levels of some chlcrofluorocarbons and other halogenated hydrocarbons are reported. These are referred to atmospheric samples collected during the 1993/94 Austral Summer Antarctic Campaign in Terra Nova Bay. Samples collected in Stainless Steel canisters were analyzed in our laboratory by gas chromatography-electron capture detection (GC-ECD). A comparison with data obtained in previous campaigns is reported as well
The effects of interaction between environment and constituent materials of Palazzo San Michele in Fano (PU)
No full textPalazzo San Michele is located in Fano on the decumanus maximus, until a few years ago an important road with heavy traffic, now a pedestrian precinct. It was built in the second half of fifteenth century and it is a fine example of Renaissance architecture. During its history it has suffered many alterations and changes in attempt to rebuilt and extend the original structure. The architect Alberto Calzabini restored it to its present appearance in 1925-1926. The facade of the building and the interior courtyard show severe deterioration of the stone materials due to the exposure to the combined action of natural weathering and strong urban pollution. In areas more protected from rain-wash, the stone surfaces are covered with black crusts, soot deposits and yellowish-grey patinas. On the contrary, white areas have been observed where the surfaces are exposed. Furthermore, the stone materials present many problems of deterioration, such as detachment, cracking, loss of materials, corrosion, exfoliation, and fracturing, and which are related to freeze-thaw cycles, migration of soluble salts and rising damps. The present work reports on the results of the investigations on the building materials (stone, bricks and palsters) and the degradation products obtained analysing the different sample typologies by optical microscopy, x-ray diffraction, electron scanning microscopy and microanalyses EDS, ion cromatografy
Il palazzo di S. Michele in Fano: studio dei materiali impiegati e del loro stato di conservazione
No full textSignificance of Selected Halocarbons Monitoring in Air Samples Collected in the Terra Nova Bay region (northern Victoria Land, Antarctica)
Full text linkCCl3F (or CFC-11) and CCl2F2 (or CFC-12) were determined in air samples collected, during subsequent summer Antarctic campaigns, in different sampling sites in the Ross Sea Region. The samples were analysed by GC-ECD after enrichment. Data obtained since 1988–89 were plotted to observe the trend of CFCs atmospheric concentration levels. A decrease in the rate of increase of CFC-12 concentration was observed, whilst the concentration of CFC-11 was actually seen to be decreasing
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