137 research outputs found
Qualità ambientale dei luoghi di produzione agricola: modello concettuale, metodo, strumenti
No full textLa questione della sicurezza agroalimentare in termini di contaminazione coinvolge l'intero sistema pianeta. Da un lato il mercato unico ha permesso di accedere a produzioni senza frontiere e, dall'altro, i processi di contaminazione territoriale conoscono, il più delle volte, una diffusione transfrontaliera ed ubiquitaria nell'ambiente. Alla luce della necessità di sapere se il cibo che mangiamo sia sano, controllare la qualità ambientale dei luoghi dove si produce diventa una condizione prioritaria ed imprescindibile. Il lavoro presentato propone modello, metodo e strumenti per la valutazione della qualità ambientale dei terreni agricoli secondo un approccio sistemico “ad imbuto” con il fine di ottimizzare il processo di analisi del territorio e individuare le aree suscettibili di contaminazione utilizzando progressivi livelli di qualificazione. Il lavoro è un punto di partenza fondativo su cui poter sviluppare un progetto integrato e sostenibile per la tutela della popolazione nel suo interesse primo e vitale, quanto l'aria e l'acqua, il diritto a un cibo sano a partire dai campi
Approccio multidisciplinare alle cave
No full textNell'ambito della pianificazione dell'attività estrattiva, un elemento essenziale per la valutazione delle potenzialità di sfruttamento del giacimento è rappresentato dalla conoscenza dell'estensione spaziale e della configurazione tridimensionale dell'ammasso roccioso, nonché delle sue proprietà litologiche.
In questo lavoro viene presentato un approccio multidisciplinare finalizzato alla definizione del modello geologico-strutturale tridimensionale (3D) del sito di coltivazione, integrante criteri di rilevamento geologico-strutturale con indagini minero-petrografiche. Il modello proposto permette (i) di considerare i rapporti geometrico-strutturali con le litologie circostanti il giacimento, e (ii) di analizzare, in un contesto tridimensionale, il corteo di deformazione (discontinuità planari e lineari) che può compromettere o alterare le proprietà geomeccaniche e mineralogiche dell’ammasso roccioso. Di seguito, sono illustrati i risultati ottenuti dall’applicazione di tale metodologia ad un caso specifico di coltivazione in rocce ofiolitiche nell’areale della cava “Tana dei Banditi” (Genova)
Tectonic structures and commercial compartments in active quarrying: a case history from northern Italy
No full textTectonic structures and commercial compartments in active quarrying: a case history from northern Italy
No full textBy studying a quarried site exposed in the Ligurian Alps (northern Italy), this work aims to assess the impact of the tectonic structures on the exploitable rock volume characteristics/properties and, more in general, on the three-dimensional quarry architecture for its future exploitation. A field-based, multidisciplinary dataset has been integrated within a 3D geological model performed in a Geographical Information System (GIS) environment. The spatial distribution, geometry, and internal fabric of the main tectonic structures (mainly represented by faults and fracture networks) have been recognised as responsible for a structural compartmentalisation within the study area. In situ geomechanical measurements (uniaxial strength by using a Schmidt hammer) have been compared with distribution of the tectonic structures. A simulation of the influence of the tectonic structures on the rock mechanical behaviour has been performed in GIS. We conclude that occurrence of tectonic structures determines a first order degree in geodiversity at quarried sites, influencing both intrinsic (lithology and petrography) and secondary (mechanical) properties of the excavated rock volume. Consequently, understanding and reconstructing the deformation style and intensity of the tectonic setting constitute a further geological exploration criterion for assessing strategy of rock excavation and exploitation. The identification of tectonic structures is relevant to face frequently documented problems in active quarrying, such as mass movement and slope failure, reduced rock-mass quality, or non-exploitable quarry domains
Formation of 2-substituted benzofuran fragment ions from 6-alkyl- and 6-aryldibenzo(d,f)(1,3)dioxepine derivatives under electron ionization-a useful precursor ion for isomeric differentiation.
No full textTandem mass spectrometry has been applied to differentiate three sets of o-, m- and p-methyl, -methoxy and -nitro-substituted-6-phenyl-dibenzo(d,f)(1,3)dioxepines. Collision-induced dissociation (CID) experiments have been carried out on 2-phenylbenzo[b]furan fragment ions, which originate from the decomposition of the molecular ions after their EI-induced isomerization to spirocyclic structures. With the exception of m- and p-methylphenylbenzo[b]furan isomers, which display identical CID mass spectra, the three isomeric methoxy- and nitrophenylbenzo[b]furan fragment ions display very characteristic CID behavior which allows unequivocal differentiation of the 6-phenyl-dibenzo(d,f)(1,3)dioxepine isomers. 6-(o-nitrophenyl)-dibenzo(d,f)(1,3)dioxepine isomer, does not form a 2-(o-nitrophenyl)benzo[b]furan ion and, therefore, it can be differentiated from the m- and p- isomers based on the mere EI mass spectra. Furthermore, it shows a characteristic ion most likely due to an ortho effect between the nitro group and the dioxepine ring. Multiple stage mass spectrometric techniques (MSn), labeled derivatives and reference compounds were used in order to gain additional information on the structures of product ion from the CID fragmentation
Electronics authentication using electrical measurements and machine learning
No full textThe problem of counterfeiting in electronics is not recent but still critical today. Identifying counterfeit devices can be a complex task since not all suspicious items are necessarily inauthentic. The paper deals with the non-destructive detection of counterfeiting in electronics by using only electrical measurements. This approach paves the way for machine learning classification-assisted counterfeit detection through electrical measurements. Physical de-processing provides the final confirmation
The emplacement of the Late Miocene Monte Capanne intrusion (Elba Island, Central Italy): constraint from magnetic fabric analyses
No full text""Anisotropy of magnetic susceptibility (AMS). analysis has been carried out in the thermometamorphic. aureole surrounding the Late Miocene Monte Capanne. pluton (Elba Island, Central Italy). The identification and. separation of the main carriers of the magnetic susceptibility. by low-temperature and high-field AMS measurements. demonstrate that a correct knowledge of the. magnetic fabric is needed in order to use AMS for tectonic. interpretations. Magnetic fabric data, combined with. structural data from the aureole, and their comparison with. data from the pluton itself, were used to constraint the. mode of pluton emplacement. Results document an intimate. linkage between the magmatic flow pattern and the. syn-metamorphic fabrics acquired during pluton emplacement. in the host rocks. The magnetic\\\/structural fabric in. the aureole rocks is dominated by flattening deformation. and no systematic relationship with any regional tectonic. feature is observed. These results suggest that local processes. induced by magma ascent in the upper crust might. have played a primary role in space generation for pluton. emplacement in the Tuscan Magmatic Province, suggesting. a revaluation of the modes of pluton emplacement during. the post-orogenic evolution of the northern Apennine system. as a whole."
Impact of pulsed-wave-Doppler velocity-envelope tracing techniques on classification of complete fetal cardiac cycles
No full textFetal echocardiography is an operator-dependent examination technique requiring a high level of expertise. Pulsed-wave Doppler (PWD) is often used as a reference for the mechanical activity of the heart, from which several quantitative parameters can be extracted. These aspects suggest the development of software tools that can reliably identify complete and clinically meaningful fetal cardiac cycles that can enable their automatic measurement. Several scientific works have addressed the tracing of the PWD velocity envelope. In this work, we assess the different steps involved in the signal processing chains that enable PWD envelope tracing. We apply a supervised classifier trained on envelopes traced by different signal processing chains for distinguishing complete and measurable PWD heartbeats from incomplete or malformed ones, which makes it possible to determine the impact of each of the different processing steps on the detection accuracy. In this study, we collected 43 images and labeled 174,319 PWD segments from 25 pregnant women volunteers. By considering seven envelope tracing techniques and the 23 different processing steps involved in their implementation, the results of our study reveal that, compared to the steps investigated in most other works, those that achieve binarisation and envelope extraction are significantly more important (p < 0.05). The best approaches among those studied enabled greater than 98% accuracy on our large manually annotated dataset
Trade Update Notes; Report of the Task Force on The Aggregate Measure of Support: Potential Use by GATT for Agriculture
No full textInternational Relations/Trade,
SINTESI E IMMOBILIZZAZIONE DI ALCUNE CUMARINE ANALOGHE DEL RESVERATROLO AL POLIETILENGLICOLE
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