1,721,132 research outputs found
Potential of photodynamic therapy in the management of infectious oral diseases
Full text linkIn recent years there are more and more multi-drug resistant infections also at the oral level and this has led researchers to find alternative solutions to conventional pharmacology that have no impact on systemic health. Among these is photodynamic therapy, which has demonstrated efficacy both in vitro and in vivo, both in bacterial, viral (reducing recrudescence) and fungal infections, in particular Candida spp multidrug resistant
I consoli britannici in Sardegna (1750-1934)
No full textIl volume contiene una raccolta di documenti conservati presso i National Archives di Kew, a Londra, riguardanti la presenza e l’attività consolare britannica in Sardegna dalla metà del Settecento al Ventesimo secolo. I testi sono preceduti da un’introduzione storica e da una nota archivistica
Chiral 5-(diphenylphosphanyl)-1,2,3,4-tetrahydroacridines: new N,P-ligands for asymmetric catalysis
No full textAnalysis of “User-Specific Effect” and Impact of Operator Skills on Fingerprint PAD Systems
No full textFingerprint Liveness detection, or presentation attacks detection (PAD), that is, the ability of detecting if a fingerprint submitted to an electronic capture device is authentic or made up of some artificial materials, boosted the attention of the scientific community and recently machine learning approaches based on deep networks opened novel scenarios. A significant step ahead was due thanks to the public availability of large sets of data; in particular, the ones released during the International Fingerprint Liveness Detection Competition (LivDet). Among others, the fifth edition carried on in 2017, challenged the participants in two more challenges which were not detailed in the official report. In this paper, we want to extend that report by focusing on them: the first one was aimed at exploring the case in which the PAD is integrated into a fingerprint verification systems, where templates of users are available too and the designer is not constrained to refer only to a generic users population for the PAD settings. The second one faces with the exploitation ability of attackers of the provided fakes, and how this ability impacts on the final performance. These two challenges together may set at which extent the fingerprint presentation attacks are an actual threat and how to exploit additional information to make the PAD more effective
Strategia di Stoccaggio e trattamento dei rifiuti tossico nocivi della Jolly Rosso nello stabilimento petrolchimico di Porto Marghera
No full textFanghi di segagione della trachite per la produzione di laterizi
No full textL’articolo propone l’utilizzo di un modello matematico per la previsione delle caratteristiche in cottura e post-cottura dei materiali ceramici basato sulla regressione lineare multipla fra vari parametri misurati sperimentalmente. L’obiettivo del lavoro è quello di dimostrare come attraverso l’utilizzo del modello proposto sia possibile studiare, stabilite le proprietà tecnologiche che si intende raggiungere, la composizione ottimale della miscela. Lo studio prende lo spunto dalla realtà sarda, regione ricca di materie prime per l’industria della ceramica ma priva di un prodotto naturale in grado di assicurare tal quale le proprietà tecnologiche richieste.
Lo studio è stato sviluppato in due fasi: la prima di caratterizzazione delle argille sarde e di confronto fra queste e quelle comunemente usate in ambito nazionale nelle preparazioni ceramiche.
La seconda parte riguarda l’elaborazione del modello statistico. Le proprietà che si dimostrano indispensabili ai fini dell’applicazione del modello sono risultate: la granulometria, la composizione chimica, i limiti di Atterberg, la perdita al fuoco (LoI), l’assorbimento d’acqua (WA), il ritiro in cottura (LFS) e la dilatabilità (DIL) in cottura. Nell’articolo si illustrano la procedura statistica seguita per la definizione del modello matematico ed i risultati delle verifiche eseguite su 15 tipologie di materiali, alcuni naturali altri miscele tra questi
Kinetics of heavy metals leaching from contaminated soils in metallurgical plants
No full textKinetics of Heavy Metals Leaching from Contaminated Soils in Metallurgical Plants
Paolo Desogus , Pier Paolo Manca , Giampaolo Orrù
Abstract
The work aims to highlight the main parameters that affect the efficiency of the process of leaching of heavy metals from a natural soil taken from inside a metallurgical plant. The studies were conducted by laboratory tests and the results will allow identifying the fundamental choices for the applications of the technique of in situ soil flushing.
The tested soil samples were mainly made by fine silica sand, with medium density. Their pollution was caused by waste of the metallurgy of lead and zinc released into the soil to transport by rainwater. Their depth ranges from 1 to 2 meters from ground the level from which they are separated by artificial strata composed of soil mixed with metallurgical solid waste. The layer of soil tested hosts an aquifer with a slow permeability, variable depth generally higher than 10m contaminated by heavy metals.
The leaching experiments were conducted through the batch and column tests. Acid solutions (acetic. nitric. hydrochloric and sulfuric) were used as extracting agents. During the leaching tests, concentrations of analytics Zn, Pb, Cd, Cu, Mn and Al were verified.
The results highlighted two aspects: (a) the conditions for which they get the best efficiency of leaching and (b) the laws of statistical correlation that describe the kinetics of reaction. The calculations performed have shown that the most efficient leaching agent was the CH3COOH and mainly the flow velocity of the leaching solution conditions the reaction kinetics in the column
Sistema binario di sonde fluorescenti per PCR real-time, metodo diagnostico e kit relativo
Full text linkL' Invenzione concerne un sistema binario di sonde delle quali almeno una presenta geometria circolare, ad elevata specificità, da utilizzare nella tecnica della PCR real-time come kit diagnostico per la rilevazione specifica di sequenze geniche e la discriminazione di specie microbiche , quali ad esempio , la sequenza IS 6110 di Mycobacterium tuberculosis
Rimozione dell’arsenico dalla soluzione di lisciviazione di un concentrato enargitico-aurifero
No full textLeaching a enargite-gold concentrate using sodium hypochlorite alkaline solutions, As is selectively dissolved in the form of arsenate AsO4(3-). In order to reuse the solution in the process, the arsenic was precipitated with ferric cloride and separated by filtration. In the study has been investigated: the influence of the method adoptated; pH; molar ratio Fe/As and reaction time. The obtained results evidenced that As has been precipitated almost completely in the form of an amourphous mixture of arsenate, ferric hydroxide and ferric oxyhydroxide(ferrihydrite), whic have a good stabilility, with small releases of arsenic on the long time in the storage ponds
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