Response of yield and oil fatty acid composition to the temperature and intercepted solar radiation of traditional and high oleic canola sown in Argentine : New findings on the behaviour of spring canola

Ponencia presentada en el Congreso GCIRC Technical Meeting 2013. Nyon, Switzerland, Suiza, 28 de abril al 01 de mayo de 2013Canola represents a promising alternative to diversify crop production in Argentina. Previous work showed that fatty acid composition and yield of winter traditional canola are affected by environmental conditions during crop cycle, being the main factor the temperature. The effects of this factor and also the intercepted photosynthetically solar radiation on the oil fatty acid composition of spring traditional and high oleic canola genotypes is, at the best of our knowledge, still unknown. To study the effect of temperature and PAR during seed filling on the fatty acid composition of canola oil in spring traditional and high oleic cultivars as well as the oil quality/yield relationships.Fil: Alberio, Constanza. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina.Fil: Izquierdo, Natalia G. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina.Fil: Cantarero, Marcelo Gabriel. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Aguirrezábal, Luis A. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina

Twisted equivariant K-theory, groupoids and proper actions

In this paper we define twisted equivariant K-theory for actions of Lie groupoids. For a Bredon-compatible Lie groupoid, this defines a periodic cohomology theory on the category of finite CW-complexes with equivariant stable projective bundles. A classification of these bundles is shown. We also obtain a completion theorem and apply these results to proper actions of groups.Comment: 26 page

Cerebellar direct current stimulation enhances on-line motor skill acquisition through an effect on accuracy

The cerebellum is involved in the update of motor commands during error-dependent learning. Transcranial direct current stimulation (tDCS), a form of noninvasive brain stimulation, has been shown to increase cerebellar excitability and improve learning in motor adaptation tasks. Although cerebellar involvement has been clearly demonstrated in adaptation paradigms, a type of task that heavily relies on error-dependent motor learning mechanisms, its role during motor skill learning, a behavior that likely involves errordependent as well as reinforcement and strategic mechanisms, is not completely understood. Here, in humans, we delivered cerebellar tDCS to modulate its activity during novel motor skill training over the course of 3 d and assessed gains during training (on-line effects), between days (off-line effects), and overall improvement. We found that excitatory anodal tDCS applied over the cerebellum increased skill learning relative to sham and cathodal tDCS specifically by increasing on-line rather than off-line learning. Moreover, the larger skill improvement in the anodal group was predominantly mediated by reductions in error rate rather than changes in movement time. These results have important implications for using cerebellar tDCS as an intervention to speed up motor skill acquisition and to improve motor skill accuracy, as well as to further our understanding of cerebellar function

Optical characterization of Mg-doped GaN films grown by metalorganic chemical vapor phase deposition

Scanning electron microscopy, micro-Raman, and photoluminescence (PL) measurements are reported for Mg-doped GaN films grown on (0001) sapphire substrates by low-pressure metalorganic chemical vapor phase deposition. The surface morphology, structural, and optical properties of GaN samples with Mg concentrations ranging from 1019 to 1021 cm−3 have been studied. In the scanning micrographs large triangular pyramids are observed, probably due to stacking fault formation and three-dimensional growth. The density and size of these structures increase with the amount of magnesium incorporated in the samples. In the photoluminescence spectra, intense lines were found at 3.36 and 3.31 eV on the triangular regions, where the presence of cubic inclusions was confirmed by micro-Raman measurements. The excitation dependence and temperature behavior of these lines enable us to identify their excitonic nature. From our study we conclude that the interface region between these defects and the surrounding wurtzite GaN could be responsible for PL [email protected] ; [email protected] ; [email protected]

Growth and optical characterization of indirect-gap AlxGa1−xAs alloys

Nonintentionally doped AlxGa1−xAs layers with 0.38 x 0.84 were grown on (100) GaAs substrates by liquid phase epitaxy (LPE) under near-equilibrium conditions. The crystalline quality of the samples was studied by photoluminescence at 2 K and room temperature Raman spectroscopy. The peculiar behavior in the photoluminescence intensities of the indirect bound exciton line and the donor–acceptor pair transition is explained from the evolution of the silicon donor binding energy according to the aluminum composition. It was also possible to observe the excitonic transition corresponding to the AlxGa1−xAs/GaAs interface, despite the disorder and other factors which are normally involved when growing high-aluminum-content layers by this technique. Furthermore, Raman measurements show the quadratic variations of longitudinal optical phonon frequencies with aluminum concentration in good agreement with previous experimental results. In this work we show that high quality indirect-gap AlxGa1−xAs samples can be grown by LPE under near-equilibrium [email protected]

ESPERIENZA DI MONITORAGGIO MEDIANTE LASER SCANNER NELL’ISOLA DI VULCANO: RILIEVO MULTI TEMPORALE DELLA FORGIA VECCHIA

Il presente lavoro è stato realizzato con l’obiettivo di divulgare le conoscenze acquisite nell’ambito del monitoraggio delle aree vulcaniche attive italiane mediante sistemi laser scanner terrestri. Le sezioni INGV di Bologna, Roma, Napoli e Catania hanno lavorato congiuntamente sin dal 2007 per sperimentare queste strumentazioni e valutarne l’efficacia per lo studio delle variazioni superficiali in aree spesso caratterizzate da materiali a bassa riflettività e quindi non facili da rilevare. I primi esperimenti sono stati realizzati sul Vesuvio nel 2007 e la ripetizione delle misure ha permesso di ottenere una serie temporale di modelli digitali (DSM) che, analizzati e confrontati, hanno permesso di mappare i crolli di porzioni delle pareti vulcaniche, misurare con precisione le variazioni dei volumi in gioco e di ideare (work in progress) un sistema speditivo per riconoscere le frane attive ed eseguire in tempo reale il rilievo delle zone di interesse. Nonostante l’esperienza vesuviana sia l’unica, per la ricchezza del data-base utilizzato, che al momento ha portato alla produzione di vari lavori scientifici [Pesci et al., 2007; Pesci et al., 2008ab; Pesci et al., 2009; Pesci et al., 2011a], è importante sottolineare che moltissime esperienze sono state fatte in questo senso, in tutte le aree vulcaniche di interesse. Sebbene i dati acquisiti non siano ancora sufficienti per realizzare un lavoro completo, hanno permesso di ampliare la conoscenza sulla metodologia e strumentazione utilizzate, sulle caratteristiche morfologiche delle aree osservate e sulle criticità del rilievo in ambiente vulcanico. Con questo rapporto tecnico si vuole illustrare l’applicazione del sistema laser scanner per il rilievo del fianco settentrionale del cono della Fossa di Vulcano e i risultati preliminari. La Fossa è un piccolo edificio vulcanico formatosi in seguito a numerose eruzioni che hanno prodotto un cono di materiale piroclastico (cenere, tufi e lapilli) negli ultimi 6000 anni [Keller, 1980; De Astis et al., 2006]. Sebbene la maggior parte delle eruzioni sono avvenute nella parte centrale del cono, alcune hanno interessato il suo fianco settentrionale, formando una sorta di cratere eccentrico, chiamato “La Forgia Vecchia” che crea una forte depressione morfologica su quel versante. L’intero cono della Fossa è soggetto a un’intensa erosione e alterazione provocata dalla circolazione di fluidi idrotermali. Già in passato il fianco settentrionale del cono vulcanico è stato interessato da fenomeni di dissesto con una frana che, nel 1988, ha riversato in mare circa 2.105 m3 di roccia nella zona antistante al porto di Levante provocando anche un piccolo tsunami [Barberi et al., 1994; Tinti et al., 1999]. L’area sovrastante la Forgia Vecchia è affetta da un’evidente instabilità gravitativa, aggravata dalla presenza dello stesso cratere eccentrico che ne accentua la ripida morfologia e dalla presenza di un importante campo di fumarole che riscalda e altera i corpi rocciosi. Già all’inizio degli anni ’90 un forte incremento delle temperature e dell’intensità di emissione delle fumarole fu accompagnato da una significativa deformazione dell’intero versante sovrastante la Forgia Vecchia, con l’apertura di crack distensivi sul bordo craterico settentrionale, a corona del versante in movimento. Tale deformazione è fortemente correlata con l’andamento delle temperature alle fumarole, ed è stata interpretata come parzialmente dovuta all’espansione termoelastica del corpo roccioso che ha a sua volta aggravato l’incipiente instabilità del versante, innescando un ulteriore movimento verso valle [Bonaccorso et al., 2010].Istituto Nazionale di Geofisica e Vulcanologia (INGV)Published1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attiverestricte

Global positioning system survey data for active seismic and volcanic areas of eastern Sicily, 1994 to 2013

This work presents and describes a 20-year long database of GPS data collected by geodetic surveys over the seismically and volcanically active eastern Sicily, for a total of more than 6300 measurements. Raw data were initially collected from the various archives at the Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania-Osservatorio Etneo and organized in a single repository. Here, quality and completeness checks were performed, while all necessary supplementary information were searched, collected, validated and organized together with the relevant data. Once all data and information collections were completed, raw binary data were converted into the universal ASCII RINEX format; all data are provided in this format with the necessary information for precise processing. In order to make the data archive readily consultable, we developed software allowing the user to easily search and obtain the needed data by simple alphanumeric and geographic queries.The work of S. Fagone and C. Giardina was supported by the Servizio Civile Nazionale ‘Terra in movimento: monitoraggio geodetico delle aree a rischio vulcanico e sismico della Sicilia’ 2012/2013 Project.PublishedID 1600621IT. Reti di monitoraggio e OsservazioniJCR Journalope