1277 research outputs found
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Simulazione di reazioni e processi in materiali per l'hydrogen storage
No full textThe adoption of hydrogen as fuel for automotive applications requires the developmentof effective technologies for its storage on board. The most promising materials for thisapplication are those in which hydrogen is stored in solid phase, being part of the structureof the material. This technology allows an high hydrogen density together withan high weight percentage and a low risk in case of accident.The development of the next generation of this class of materials requires a propermodelization of the chemical reactions and physical processes occurring during the releaseand uptake of hydrogen, and in particular the role played by catalysts. In fact, togetherwith an higher capacity, the next generation of solid state hydrogen storagematerials, the first expected to be used in real applications, must be able to achieve ahigher life cycle (higher number of charge-discharge cycles).Our research focused on the study of the de-hydrogenation path in one of the mostknown material: sodium alanates (NaAlH4, Na3AlH6). Combining modern methods forthe reconstruction of the free energy surface and an ab-initio calculation for the modelizationof interatomic forces (density function theory in generalized gradient approximation),we were able to demonstrate that the limiting step of the de-hydrogenationprocess in this material is the diffusion of hydrogen atoms from one defective AlH6unit to another in its nearest neighbor shell. We also shown that this process is not affectedby the catalyst. We therefore concluded that a further study of this process, focusingon the chemical reaction rather than on the diffusion process is needed tounderstand the role played by the catalyst
SURplus Open Archive (OA): il repository istituzionale a servizio della ricerca
No full textOA (Open Archive) is an integrated module of the SURplus service for the creation of an institutional repository for the research output. The module, based on the open-source software ‘DSpace’, was implemented by the AePIC Team developers at CILEA to ensure compliancy with international standards and visibility requirements for publications, authors and their institutions on one hand, and the necessary flexibility to support processes at different universities or research centres on the other hand. Within the SURplus suite, the OA module provides data and metadata for further elaboration: reports, statistical analysis, research evaluation and assessment according to a variety of metrics.OA (Open Archive) è il modulo integrato del servizio SURplus che permette di creare un repository istituzionale per i prodotti della ricerca. Il modulo è stato realizzato dal team AePIC del CILEA basandosi su una personalizzazione ed evoluzione del software open source DSpace e consente da un lato la piena conformità agli standard internazionali che garantiscono ampia visibilità alle pubblicazioni, ai loro autori e alle istituzioni che li supportano, dall'altro la flessibilità necessaria all'adattamento ai processi di ciascun ateneo o ente di ricerca. Nell'ambito della suite SURplus il modulo OA fornisce tutti i dati e metadati utili alla reportistica, all'analisi statistica e alla valutazione dei prodotti della ricerca secondo varie metriche
DSpace e System Integration: soluzioni innovative per le tesi di dottorato
No full textDoctoral theses often represent the upper edge of academic research activities. As such, they deserve the highest visibility and dissemination opportunities, for the benefit of their authors and the supporting institutions. Their impact would also contribute to prevent the marginalization of Italian research in the European and world-wide context. Changes in norms and rules are also driving universities towards automation of processes and adoption of digital formats. In this situation universities look for software solutions that can be integrated in their information environment, contribute to the automation of the archiving process and provide theses with high visibility on the net. CILEA fulfills these needs with the OA module of the SURplus suite, customized for the specific treatment of dissertations.Le tesi di dottorato rappresentano spesso la frontiera delle attività di ricerca di un ateneo e, in quanto tali, meritano la massima visibilità e diffusione, a beneficio degli autori e delle istituzioni che li sostengono, anche per evitare la marginalizzazione della ricerca italiana nel contesto europeo e mondiale. L'evoluzione della situazione normativa spinge inoltre nella direzione dell'automazione delle procedure e della disponibilità dei formati digitali. E’ in quest'ottica che sta maturando una crescente richiesta da parte degli atenei italiani di soluzioni software che possano integrarsi nel tessuto informativo istituzionale, contribuiscano all'automazione del processo di deposito delle tesi di dottorato e forniscano nel contempo alle stesse una maggiore visibilità in rete. A tale esigenze il CILEA risponde estendendo il modulo OA della suite SURplus alla gestione delle problematiche specifiche delle tesi
UNIPOLLS, nuovo prodotto CILEA per la gestione delle elezioni delle rappresentanze studentesche di Ateneo
No full textThe paper presents the UNIPOLLS software system carried out by CILEA for administering activities and products dealing with student elections within each university college.L'articolo presenta il sistema software UNIPOLLS realizzato dal CILEA per la gestione delle attività e dei prodotti inerenti le elezioni delle rappresentanze studentesche in seno agli organi universitari
SOUL - un sistema integrato per l'inserimento lavorativo post universitario
No full textCASPUR teamed up with two roman Universities, Sapienza and Roma Tre, later joinedby Tor Vergata and Foro Italico, to implement an integrated job placement system. Basingon expertises accumulated in past experiments, SOUL merges conventional approaches,like job placement offices, with a Web portal that realizes a virtual jobmarket-place. The system is designed from the outset to be extensible, as demonstratedby the additional module to manage students’ internships. As 15% of Italian graduatescome from the Universities involved in the project, this is a unique opportunity for experimentationand development of best practices to apply more spreadly. SOUL is alsoa platform for advanced technological experimentation, like automated scoring of curriculawith respect to job offerings, based on neural networks techniques
Ecografia 3-D in tempo reale
No full textMany academic and industrial research teams are working towards the improvementof ultrasound techniques for medical diagnostic applications, in order to have volumetricechographic images in real time. The unique way to approach this problem isto use a matrix array transducer and to develop an echographic system able to handlethousands of electronic channels. A volumetric echographic system is a hard task !During the past decades huge advances have been made in the field of ultrasound imagingfor medical diagnostic applications. Conventional echographic probes are based,by now, on the mature piezoelectric technology. Recently, alternative technologiesbased on different operating principles have been proposed. In particular, the siliconmicromachined capacitive ultrasonic transducer technology (cMUT) has shown to besuitable for the replacement of the current technology. The main benefits of cMUT technologycan be found in the silicon micromachining process, commonly used in microelectronics.In order to have real time volumetric images a two dimensional matrixtransducer must be used; the afore mentioned cMUT technology is well suited for thistype of new transducers. Roma Tre has a program to develop this kind of transducersbut, because their geometrical characteristics are strongly dependent on the structureof the echographic system used, a preliminary exploration must be made in order todefine its principal features. This activity entails a huge amount of end-to-end simulationsof the whole process, from signal acquisition to the final image, to assess the impactof design choices on diagnostic capabilities
High Performance Computing and Grids (HPCG 2008) a Cetraro
No full textThe International Conference HPGC 2008 concerned about two important news from HPC world: the evolution from Grids to Cluod Services and the new challenges to create Exascale computing environments.La conferenza internazionale HPCG 2008 ha trattato numerose novità nel mondo del Calcolo ad Alte Prestazioni, con particolare attenzione a due temi: l’evoluzione dal Grid al Cloud Computing e la nuova sfida tecnologica per raggiungere l’ExaFLOPS
Corsi on-line per il calcolo tecnico-scientifico
No full textThe Fortran programming for high performance computing course is now available on-line, hosted on a customization of the Open Source learning platform Moodle. The reasons that brought to the project and the techniques used for realising it are sketched. On the basis of the interest other on-line courses on high performance computing techniques will readily become a reality.Il corso di programmazione in Fortran per il calcolo scientifico intensivo è interamente disponibile on-line, ospitato su una personalizzazione della piattaforma didattica Open Source Moodle. Si presentano le motivazioni che hanno portato a questo risultato e le modalità di realizzazione. Altri corsi on-line a supporto del calcolo numerico intensivo potranno presto affiancarsi a questo se l’interesse verso questo tipo di iniziative continuerà a mostrarsi vivace
Progetto emodinamica computazionale @CILEA
No full textIn this article the use of computational models for haemodynamics problems is introduced highlighting the scien¬tific network concerning this topic in which the High Performance Computing group of CILEA is involved.In questo articolo viene introdotta la modellazione al calcolatore di problemi di emodinamica al fine di illustrare le potenzialità offerte dall’ampio circuito di collaborazioni scientifiche su questo tema in cui la Sezione Calcolo ad Alte Prestazioni e Applica¬zioni Scientifiche e Ingegneristiche del CILEA è coinvolto