1,721,009 research outputs found
Nanomaterials for restoration of damaged plaster surfaces: case of studies
No full textnanomaterials are applied in the restoration and conservation of Cultural Heritage because of several analytical advantages could be obtained thanks to their excellent chemical-physical, mechanical and engineered features. A great deal of nano-scale objects, as: nanoparticles, nanogels, nanofoams, nanosponges, nanopolymers are very useful for the cleaning of the art-work surfaces, restoration and conservation of wall paintings, marble stones, plasters, metallic surfaces and glass mosaic tesserae. Also for the deacidification of the ancient damaged paper, containing iron gall inks, and the preservation of parchment and canvas new nano-scale objects are easily synthesized and applied on these art-work surface
Traceability of Asiago mountain cheese. a rapid, low cost analytical procedure for its identification based on a solid-phase microextraction GC-MS procedure
No full textThe traceability of Asiago mountain cheese was established
by analyzing samples of herbaceous species,
milk, and cheese of mountain origin using the headspace
solid-phase microextraction sampling procedure
coupled with gas chromatography-mass spectrometry.
As preliminary work had highlighted the characteristic
presence of sesquiterpenes in Asiago mountain cheese,
these species were considered effective markers of
mountain origin. Systematic qualitative analysis, carried
out using a carboxen/polydimethylsiloxane fiber,
revealed several sesquiterpenes in mountain herbage
and milk, in particular β-caryophyllene and α-humulene,
in Asiago mountain cheese, confirming sesquiterpenes
as markers of cheese produced from animals
grazing on mountain pastures. Analysis was performed
on 19 samples of herbage, 8 of milk, and 8 of cheese,
collected in summer from 4 mountain farms on the
Asiago plateau. For quantitative analysis of caryophyllene
in cheese, polydimethylsiloxane fiber sampling,
coupled with the standard addition method to eliminate
matrix effect, was preferred. The amount of β-caryophyllene
found ranged from 21 to 65 microg/kg
Tesserae of Graduates. Competences for Mosaics of Work Activities
No full textIn this paper we analyse the competences used by the Bachelor and Master graduates of the University of Padua to perform their work roles. Through multivariate statistical methods, we analyse the frequencies with which the basic, cross-occupation and occupation-specific competences are used by employed graduates. The basic idea is that competences may be considered tesserae of a mosaic of graduate’s professional personality. We analyse the relationship between competences and a set of professions. The differential effect, on competence use, of the specific degree held by each graduate is evaluated through a multilevel statistical analysis, so to connect graduate’s features and working environment’s characteristics in terms of a selected set of competences
Reticoli multidimensionali di legami "deboli" per la ricerca di lavoro dei laureati dell'Università di Padova
No full textNella nota si applicano alcuni modelli statistici per interpretare il ricorso dei neo-laureati ai cosiddetti “legami deboli”, vale a dire alle conoscenze personali informali, finalizzato ad ottenere una posizione lavorativa. Sociologi ed economisti del lavoro considerano queste conoscenze uno dei canali più efficaci per
l’ottenimento di un lavoro. I legami sono analizzati con riferimento alla ricerca della prima attività da parte dei laureati e dei diplomati dell’Università di Padova tramite le conoscenze di tipo familiare o di amicizia e quelle dei professori universitari. Con riferimento alla ricerca di una posizione di lavoro più consona all’investimento formativo, si esamina anche la conoscenza di opportunità di miglioramento della posizione trasmesse ai laureati occupati dai colleghi di lavoro. Muovendo dall’ipotesi che i neolaureati ricorrano alle conoscenze personali in modo differenziato, si segmenta, con un metodo multivariato, il campione distinguendo per facoltà di provenienza e,
all’interno della facoltà, secondo le caratteristiche curriculari e sociali dei laureati
Traceability of Asiago Mountain Cheese: A Rapid, Low-Cost Analytical Procedure for its Identification Based on Solid-Phase Microextraction
Full text linkThe traceability of Asiago mountain cheese was established by analyzing samples of herbaceous species, milk, and cheese of mountain origin using the headspace solid-phase microextraction sampling procedure coupled with gas chromatography-mass spectrometry. As preliminary work had highlighted the characteristic presence of sesquiterpenes in Asiago mountain cheese, these species were considered effective markers of mountain origin. Systematic qualitative analysis, carried out using a carboxen/polydimethylsiloxane fiber, revealed several sesquiterpenes in mountain herbage and milk, in particular β-caryophyllene and α-humulene, in Asiago mountain cheese, confirming sesquiterpenes as markers of cheese produced from animals grazing on mountain pastures. Analysis was performed on 19 samples of herbage, 8 of milk, and 8 of cheese, collected in summer from 4 mountain farms on the Asiago plateau. For quantitative analysis of caryophyllene in cheese, polydimethylsiloxane fiber sampling, coupled with the standard addition method to eliminate matrix effect, was preferred. The amount of β-caryophyllene found ranged from 21 to 65 ug/kg
Un modello dinamico per la simulazione termoigrometrica degli edifici in ambiente matlab
No full textIon Chromatographic Determination of Nitrite in the Presence of a Large Amount of Chloride.
No full textDifferent procedures for the quantitation of nitrite in the presence of a large excess of chloride are described. The results obtained show that, in general, solutions characterized by N02-/Cl- ratios of about 1/10 000 can very easily be analyzed. The best results were obtained with amperometric detection in conjunction with NaCI as the eluent which allows ratios down to about 1/700 000 to be employed. One of the procedures investigated was successfully applied to the analysis of samples of sea-water from fish breeding pools. © 1989
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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