5,397 research outputs found
A Grid architectural approach applied for backward compatibility to a production system for events simulation.
No full textDistributed systems paradigm gained in popularity during the last 15 years, thanks also to the broad diffusion of distributed frameworks proposed for the Internet plat form. In the late ’90s a new concept started to play a main role in the field of distributed computing: the Grid.
This thesis presents a study related to the integration between the BaBar’s framework, an experiment belonging to the High Energy Physics field, and a grid system like the one implemented by the Italian National Institute for Nuclear Physics (INFN), the INFNGrid project, which provides
support for several research domains. The main goal was to succeed in adapt an already well established system, like the one implemented into the BaBar pipeline and based on local centers not interconnected between themselves, to a kind of technology that was not ready by the time the
experiment’s framework was designed. Despite this new approach was related just to some aspects of the experiment, the production of simulated events by using MonteCarlo methods, the efforts here described represent an example of how an old experiment can bridge the gap toward the Grid computing, even adopting solutions designed for more recent projects.
The complete evolution of this integration will be explained starting from the earlier stages until the
actual development to state the progresses achieved, presenting results that are comparable with
production rates gained using the conventional BaBar’s approach, in order to examine the potentially benefits and drawbacks on a concrete case study
Libero Andreotti e il contributo degli artisti alla Sezione Arredi Navali Ducrot
No full textCon la collaborazione con Gustavo Pulitzer Finali e con Libero Andreotti per gli interni della motonave Victoria il mobilificio palermitano Ducrot, nel 1931, di colpo rientra nel “moderno”; un orientamento che, invero, ne avrebbe connotato solo per casi eccellenti la strategia aziendale nella rimanente stagione del ventennio, ma la cui impronta ne caratterizzerà il rilancio dal periodo della «Ricostruzione» agli anni del «Miracolo Economico» come la più qualificata industria italiana di arredi navali. La ripresa dei rapporti di lavoro con esponenti del mondo artistico, e segnatamente con quanti fra pittori e scultori orientavano la propria opera in direzione del “rinnovamento” (più che del “nuovo”), era in realtà un ritorno alle origini, sia pure in una più modesta dimensione, quando l’impresa di Vittorio Ducrot grazie alla collaborazione con Ernesto Basile e con il suo cenacolo di artisti era assurta al rango di industria italiana esemplare sia per l’applicazione del principio del pareggiamento delle arti sia per la disponibilità alla mediazione fra profitto e cultura
Sorologia de Neospora Caninum em gado de corte e em cães na região de Campo Grande, MS.
No full textNa publicação: Renato Andreotti
Andreotti-Mayer loci and the Schottky problem
No full textWe prove a lower bound for the codimension of the Andreotti-Mayer locus N-g,N-1 and show that the lower bound is reached only for the hyperelliptic locus in genus 4 and the Jacobian locus in genus 5. In relation with the intersection of the Andreotti-Mayer loci with the boundary of the moduli space A(g) we study subvarieties of principally polarized abelian varieties (B,Xi) parametrizing points b such that Xi and the translate Xi(b) are tangentially degenerate along a variety of a given dimension
Action of Tagetes minuta (Asteraceae) essential oil in the control of Rhipicephalus microplus (Acari: ixodidae).
No full textComissão organizadora: Renato Andreotti, Fernando Paiva, Wilson Werner Koller, Jacqueline Cavalcante Barros, Luiz Antonio Dias Leal, Jaqueline Matias
Influence of Average Photon Energy index on solar irradiance characteristics and outdoor performance of photovoltaic modules
No full textSolar spectral irradiance measurements on a routinely basis are relevant to study the influence of solar spectrum on the photovoltaic (PV) module performance, especially for thin film and third generation PV. Two spectroradiometers from EKO were added to the instrumentation available at the ESTER outdoor station of the University of Rome Tor Vergata. A detailed characterisation of the spectral irradiance at the site was carried on during more than 6 months of monitoring activity measuring spectral solar irradiance in the range 350–1700 nm with a time interval of 10 min on a horizontal plane. A wide variety of spectra were acquired in various weather conditions, and indications about the spectra behaviour on a daily and seasonal basis were obtained. Moreover, information about the effect of the weather conditions on the solar radiation spectral distribution were identified. The Average Photon Energy index was used as an indicator of the spectra characteristics. The same index was also used to evidence the solar spectrum influence on polycrystalline and double junction amorphous silicon PV modules
Solar spectral irradiance measurements relevant to photovoltaic applications
No full textRecently, two spectroradiometers from EKO have been added to the instrumentation available
at the ESTER outdoor station of the University of Rome Tor Vergata, with the aim to
characterize the spectral irradiance at the site and evaluate its influence on the performances of
photovoltaic modules, especially thin films and third generation devices as Dye Sensitized
Solar Cells (DSSC). The paper will present the results of more than six months monitoring
activity where the spectral solar irradiance in the range 350 nm – 1,700 nm has been measured
continuously with a time interval of 10 minutes on a horizontal plane. A wide variety of spectra
have been acquired in various weather conditions and first indications about the spectra
behaviour on a daily and seasonal basis have been obtained. Moreover also some information
about the effect of the weather conditions on the solar radiation spectral distribution will be
presented
Use of fragility curves to assess the seismic vulnerability in the risk analysis of mountain tunnels
No full textThe high uncertainties involved in the design and construction of mountain tunnels have driven the development
of risk analysis procedures to control the risk level within an acceptable range. Since underground constructions
have proven to perform better than above-ground structures during the past earthquakes, the assessment of the
seismic risk of this kind of infrastructures is generally disregarded. Yet, post-earthquake investigations have
shown that tunnels are exposed to seismic risk because they are vulnerable to ground shaking. For this reason, a
comprehensive risk analysis should also include the seismic risk assessment. Fragility curves, which express the
conditional probability to manifest a certain level of seismic damage given a certain seismic intensity measure
(e.g. Peak Ground Acceleration), represent a suitable tool that can be implemented in the risk analysis of
mountain tunnels for a rapid seismic risk assessment. The currently available fragility curves for rock tunnels are
based on expert-opinion or empirical approach, without a properly consideration of the system variability (e.g.
tunnel type and rock characteristics, depth of the construction). This article proposes a comprehensive numerical
methodology to construct fragility curves for mountain tunnels subjected to transversal seismic loading. The
proposed numerical technique, which is based on fully-nonlinear dynamic analyses accounting for the nonlinearity
of both ground and tunnel support, allows to consider the features of the tunnel (e.g. type of support,
geometry, type of rock mass and depth of construction) as well the variability of the seismic input motion in a
more systematic way. Different sets of fragility curves for tunnels bored in fractured rock have been defined in
this article. Finally, two simplified case studies have been presented aiming to illustrate the potential uses of the
fragility curves within the risk analysis of mountain tunnels. In the first case study the fragility curves are used to
evaluate the probability of seismic damage of several tunnels to assess the functionality of the road network in
the post-seismic phases. In the second case study, the fragility curves are used to optimize the selection of the
tunnel support with regard to the seismic action. In particular, fragility curves are used to evaluate the level of
seismic risk associated to the selection of two different types of final lining
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