305,283 research outputs found
Simple scaling analysis of active channel patterns in Fiumara environment
No full textA simple scaling analysis was performed on experimental data relative to a riverbed reach of the Allaro Fiumara, a fluvial environment typical of Southern Italy. For this purpose, a simplified geometrical approach was followed to determine the spatial distribution of the number of active channels for the river stretch considered. In particular, the section lines crossing the braided network skeleton with distance ranging from 5 to 200. m were considered. Firstly, a probabilistic analysis of the experimental data was carried out by using a truncated Poisson distribution to characterize the examined river morphologically. Afterward, a scaling analysis was performed to investigate the existence of a possible multimodal behaviour of the number of active channels and to identify the corresponding cutoff values. For this second approach by the so-called standard coarse graining analysis, we defined a power law usable to give the probability distribution of the active channels number with varying spatial partition (distance between consecutive sections). In this way, verifying the existence of a bimodal scaling behaviour was possible. Moreover, the cutoff limits that characterize the bimodal behaviour of the active channels were found for all the partition distances from 5 to 100. m, while the corresponding shape and scale parameters were also determined. A comparison of the results obtained by the statistical approach and the scaling analysis was carried out. The variability of the characteristic parameters of the Poisson and power type laws with scale was also investigated
Contribution of Blood Orange-Based Beverages to Bioactive Compounds Intake
No full textThe study aimed at screening the levels of ascorbic acid, hydroxycinnamic acids (HCAs) and total anthocyanins in commercial beverages containing blood orange juice (BOJ), estimating the contribution of these products to the intake of health-promoting compounds and at discussing the actual value of the products on a price/bioactive level basis. Results demonstrate that the reference to BOJ in many beverages is misleading, as inferred from the very low bioactive levels observed. These beverages, in label should refer as “water-based” instead of “fruit-based beverage.” Accordingly, the intake of bioactives from BOJ-based beverages, with the exception of ascorbic acid used in the most cases as preservative, is often very low. The intake of bioactive components from blood orange consumption is much higher compared to the consumption of BOJ-based beverages, hence the consumption of blood oranges and 100% BOJs should be preferred in order to guarantee the intake of a rich pool of bioactive compounds. Finally, the market value of BOJ-based beverages is not correlated with their real nutritional value: the relative unitary cost of the three classes of bioactive compounds considered increased in the order: fresh blood oranges < 100% BOJ < BOJ-based beverages. Hence, the consumption of fresh blood oranges represents the cheapest way to ensure the intake of health-promoting bioactive compounds such as anthocyanins and HCAs
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Effects of light exposure, bottle colour and storage temperature on the quality of malvasia delle lipari sweet wine
No full textThe influence of light exposure, bottle color and storage temperature on the quality parameters of Malvasia delle Lipari (MdL) sweet wine were investigated. Wine samples bottled in clear-colored (colorless, green and amber) glass were stored under different artificial lighting conditions, in order to simulate the retail environment (one cool-white, fluorescent lamp) and to perform an accelerated test (four and six cool-white, fluorescent lamps). The storage temperature was kept constant (25◦C) for the first 90 days of the experiment and then samples were monitored for up to 180 days at higher temperatures (30, 35 and 40◦C). The principal enological parameters, total phenols, color, 5-hydroxymethylfurfural (HMF) and 2-furaldehyde (2F) contents were studied. The shelf-life test pointed out minimum variations of the basic chemical parameters, while the quality attributes most affected by lighting were color, together with HMF and 2F levels which, hence, can be considered as indicators of the severity of storage conditions
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Confronto tra valori di K e di S ottenuti da Slug Test e Pumping Test in un acquifero confinato riprodotto in laboratorio.
No full textAnalisi frattale delle curve di ritenzione idrica: un approccio multi-scaling
No full textL’analisi delle curve di ritenzione idrica tramite la geometria frattale si basa sulla definizione di modelli teorici che hanno come supporto fenomenologico lo schema geometrico noto come spugna di Menger. Tali modelli permettono di valutare in
termini parametrici il processo di scala della ritenzione idrica, il quale può essere descritto attraverso lo scaling relativo sia alla componente prossima alla saturazione e sia alla parte prossima al drenaggio completo. L’ambito di variabilità
di detti intervalli di scala è tuttora oggetto di studio e di interpretazione fisica, vista la complessità del fenomeno idraulico connesso. Gli approcci seguiti negli ultimi anni analizzano la variabilità di diversi parametri legati alla stima diretta e/o indiretta degli scaling, ossia correlati alla definizione della dimensione frattale. Tuttavia, i riscontri sperimentali hanno indicato che la natura della ritenzione
idrica può essere descritta mediante un processo additivo che tiene conto delle singole componenti che intervengono nel fenomeno dello scaling di ritenzione stesso, sia per alti che per bassi contenuti idrici. Tale aspetto risulta particolarmente evidente nelle applicazioni dirette dei modelli cosiddetti bi-frattali,
già estensione di quelli a scala unica (simple-scaling) i quali manifestano una complessa variabilità delle dimensioni frattali stimate con caratteristiche ben diverse da quelle limite del supporto euclideo. Ciò induce a ritenere che il fenomeno
della ritenzione idrica sia supportato geometricamente da un insieme di misure in intervalli di scaling diversi (multi-scaling) limite e/o intermedi. Quanto sopra esposto è stato verificato tramite una campagna sperimentale che ha utilizzato i dati
ricavati su un’area ubicata in località Ponticelli (Napoli)
Mapping of natural tracers with geoelectrical resistivity and self-potential prospecting methods in a groundwater experimental test site
No full textAspetti qualitativi e quantitativi della proteolisi nel corso della stagionatura del formaggio Ragusano.
No full textLe lettere di Scipione Maffei ad Angelo Calogerà (1729-1754)
No full textDa un ricco ma finora poco valorizzato fondo epistolare della Biblioteca Nazionale Russa di San Pietroburgo emergono, quasi tutte inedite, le 120 lettere che qui si pubblicano. Comprese fra il 1729 e il 1754, ne è autore il marchese veronese Scipione Maffei (1675-1755), uno dei più acuti, eclettici e combattivi intellettuali del primo Settecento italiano, allora impegnato nelle sue maggiori imprese e battaglie culturali, dalla Verona illustrata all’Istoria teologica, dalle «Osservazioni letterarie» al Museum Veronense, dal dibattito sull’‘impiego del danaro’ alla polemica sulla magia, dall’‘etruscheria’ all’‘elettricismo’. Indirizzate al padre camaldolese Angelo Calogerà (1696-1766), revisore alle stampe della Serenissima e principale redattore di alcune fra le più rilevanti testate del giornalismo erudito italiano settecentesco (su tutte la «Raccoltà d’opuscoli scientifici e filologici», 1728-1754), le missive restituiscono un vivido aperçu dall’interno – stili di pensiero, meccanismi, alleanze, strategie, interessi, protagonisti e comprimari del giornalismo erudito e dell’editoria pré-Lumières: un mondo fervido e operoso, su cui si esercita, tenace e talora persino destabilizzante, l’impulsiva ‘tirannia’ letteraria del marchese di Veron
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