35 research outputs found
Un'esperienza didattica di approccio interdisciplinare
No full textIl saggio descrive le modalità e gli obiettivi di ricerca svolta presso l'abbazia di Sassolino (Foligno) durante la prima campagna di scavo condotta dalla Scuola di Specializzazione in Beni architettonici e del Paesaggio di Sapienza Università di Roma. Nel corso della campagna di scavo sono stati ritrovati e riportati in luce resti dell'antico 'paradiso', luogo antistante la facciata della chiesa medievale e di sepolture medievali e rinascimentali. Un ulteriore fondamentale apporto è stato portato per la lettura stratigrafica del complesso abbaziale
Site characterization report at the seismic station IT.FOCC – Foligno (PG) Report di caratterizzazione di sito presso la stazione sismica IT.FOCC – Foligno (PG)
No full textFinal report illustrating the site characterization for seismic station IT.FOCC“Caratterizzazione siti accelerometrici” (Coord.: G.Cultrera, F. Pacor)
Cite as: Working group INGV "Agreement DPC-INGV 2019-21, All.B2- WP1, Task 2”, (2020). Site characterization report at the seismic station IT.FOS – Foligno (PG) http://hdl.handle.net/2122/14053Unpublished5T. Sismologia, geofisica e geologia per l'ingegneria sismic
Un modello di inclusione sociale e lavorativa. Il Programma PRO.P. in Umbria
No full textISFOL, Pavoncello D., Un modello di inclusione sociale e lavorativa. Il Programma PRO.P. in Umbria, Foligno, 16 ottobre 2014. Isfol OA: Presentation. Nell'ambito del progetto Pro.P. in Umbria, si presentano i laboratori di formazione partecipata rivolti alle persone con disabilità psichica e agli operatori. Una progettazione quindi partecipata tra tutti gli attori coinvolti al fine di creare una società più inclusiva e solidale. 16/10/2014presentation. nell'ambito del progetto pro.p. in umbria, si presentano i laboratori di formazione partecipata rivolti alle persone con disabilità psichica e agli operatori. una progettazione quindi partecipata tra tutti gli attori coinvolti al fine di creare una società più inclusiva e solidale. 16/10/2014 un modello di inclusione sociale e lavorativa. il programma pro.p. in umbria daniela pavoncell
Nouvelle évaluation des données de neutrons retardés et de covariances associées
No full textLorsqu'un noyau fissionne, environ trois neutrons prompts sont émis immédiatement. Toutefois, une faible fraction de neutrons supplémentaires (<1%) apparaît un certain temps après la fission. Les neutrons retardés (NR) contre-balancent le caractère incontrôlable d'une réaction en chaîne pilotée uniquement par des neutrons prompts en ralentissant la réponse d'un réacteur à une variation de réactivité. La principale conséquence d'un manque de précision sur les données des NR est l'augmentation du conservatisme à la conception du réacteur au regard des marges de sûreté imposées par l'Autorité de Sûreté. Aujourd'hui, la dispersion entre les réactivités simulées avec différentes bibliothèques de données atteint jusqu'à 16% et les incertitudes associées aux paramètres recommandés restent trop importante pour les besoins de l'industrie. Cette thèse a pour but de produire un nouveau jeu de paramètres pour les NR en conduisant à la fois des calculs et des mesures puis en exploitant ces deux sources grâce à l'assimilation Bayesienne. Cela permettrait de réduire les incertitudes sur les données des NR et de créer les matrices de covariance qui leurs sont associées. Les résultats pour l'235U et les paramètres calculés pour l'238U, ont été testés dans trois benchmarks, en donnant des solutions satisfaisantes par rapport à la fraction effective de neutrons retardés. La réussite principale de ce travail est la grande amélioration de la réactivité prédite, spécialement pour des périodes négatives. De plus, elle est accompagné par une précision extrêmement bonne, qui ne dépasse jamais 2.2%.In the context of nuclear reactor physics, one of the main issues is the control of the chain reaction. After a fission event has occurred, around three prompt neutrons are immediately emitted. Luckily, a small fraction of neutrons - less than 1% - appears with a certain delay with respect to the fission event. Delayed neutrons (DN) are an easy way out from the uncontrollable prompt-neutron driven chain reaction because they slow down the response of the reactor to a change in reactivity. Quantifying the fraction of such neutrons as well as their kinetic behavior is essential to design a safe reactor. The main consequence of a lack of accurate DN data is the conservatism in the design of a reactor. Nowadays, the discrepancy between the reactivity simulated using different international databases, rises up to 16% for LWRs, and the uncertainties associated with the recommended parameters are still too large for the needs of the industry. The DN parameters are generally estimated through a calculation or an integral measurement. This Ph.D. aims at producing a new set of DN parameters by performing both calculations and measurements, and by exploiting the two through the Bayesian inference, with the aim of reducing the uncertainties and creating the associated covariance matrices.The results for 235U, together with the calculated values for 238U, have been tested in three benchmarks, giving satisfying solutions with respect to the effective delayed neutron fraction. The main achievement of this work is the great improvement in the predicted reactivity, especially for negative periods, which is accompanied by an extremely good precision, never exceeding 2.2%
Il nuovo volto delle città umbre nella restaurazione pontificia: Antonio Mollari a Foligno / The new aspect of Umbria cities during the papal restoration: Antonio Mollari in Foligno
No full textIl «Concorso per la Decorazione della facciata, e ristauro della Torre», bandito nel febbraio del 1834 dal Comune di Foligno, inaugura la stagione umbra delle “facciate addossate”: vere e proprie maschere di pietra e stucco che non si sostituiscono alla facciate preesistenti, ma si giustappongono ad esse in guisa di contrafforte. In questo modo, nelle zone ad alto rischio sismico, l’esigenza di rinforzo strutturale si connette strettamente alle istanze di aggiornamento di gusto nell’ornato urbano. Antonio Mollari, autore del progetto prescelto dalla commissione deputata dalla Pontificia Accademia di Belle Arti di Bologna, è un pioniere di tale strategia. Il suo progetto di concorso per la nuova facciata del Palazzo Comunale di Foligno lo inserisce a buon diritto nel novero degli architetti e degli ingegneri che, nella prima metà dell’Ottocento, cambiano radicalmente il volto delle città umbre con un lungo elenco di edifici pubblici di grande qualità: Pietro e Vincenzo Ghinelli, Luigi Poletti, Virginio Vespignani, Ireneo Aleandri.
The “Concorso per la Decorazione della facciata, e ristauro della Torre” (contest for façade decoration and tower restoration) announced in February 1834 by Foligno’s Municipality, inaugurates the Umbrian period of “leaned-against façade”: authentic stone and plaster masks that do not replace preexisting façades, but juxtapose to them as a buttress. Thus, in high seismic risk areas, the necessity of a structural support is strictly connected to the request of a revision of the urban decoration style. Antonio Mollari, author of the project selected by the appointed Bologna’s “Pontificia Accademia di Belle Arti” committee, is a pioneer of the above metioned strategy. His contest project for the new façade of Foligno’s Palazzo Comunale rightfully places him in that group of architects and engineers who, in the first half of the XIXth century, radically changed Umbrian cities aspect with a long list of high quality public buildings, namely Pietro e Vincenzo Ghinelli, Luigi Poletti, Virginio Vespignani, Ireneo Aleandri
Nouvelle évaluation des données de neutrons retardés et covariances associées
No full textIn the context of nuclear reactor physics, one of the main issues is the control of the chain reaction. After a fission event has occurred, around three prompt neutrons are immediately emitted. Luckily, a small fraction of neutrons - less than 1% - appears with a certain delay with respect to the fission event. Delayed neutrons (DN) are an easy way out from the uncontrollable prompt-neutron driven chain reaction because they slow down the response of the reactor to a change in reactivity.Quantifying the fraction of such neutrons as well as their kinetic behavior is essential to design a safe reactor. In particular, in order to determine the safety margins, a rigorous estimation of uncertainties and covariances is necessary. The main consequence of a lack of accurate DN data is the conservatism in the design of a reactor. Nowadays, the discrepancy between the reactivity simulated using different international databases, rises up to 16% for LWRs, and the uncertainties associated with the currently recommended parameters are still too large for the needs of the industry. In addition to that, the covariance matrix associated with the abundances has never been produced. The DN parameters are generally estimated through a calculation or an integral measurement.This Ph.D. aims at producing a new set of DN parameters by performing both calculations and measurements, and by exploiting the two through the Bayesian inference, with the aim of reducing the uncertainties and creating the associated covariance matrices. The results for 235U, together with the calculated values for 238U, have been tested in three benchmarks, giving satisfying solutions with respect to the effective delayed neutron fraction. The main achievement of this work is the great improvement in the predicted reactivity, especially for negative periods, which is accompanied by an extremely good precision, never exceeding 2.2%.Dans le domaine de la physique des réacteurs, une des principales préoccupation est la maîtrise de la réaction en chaîne. Lorsqu’un noyau fissionne, environ trois neutrons prompts sont émis immédiatement. Toutefois,une faible fraction de neutrons supplémentaires - moins d’1% de la population totale - apparaît un certain temps après la fission. Les neutrons retardés (NR) contre-balancent le caractère incontrôlable d’une réaction en chaîne pilotée uniquement par des neutrons prompts en ralentissant la réponse d’un réacteur à une variation de réactivité.Quantifier la fraction de NR ainsi que leur cinétique est essentiel pour concevoir des réacteurs sûrs. La principale conséquence d’un manque de précision sur les données des NR est l’augmentation du conservatisme à la conception du réacteur au regard des marges de sûreté imposées par l’Autorité de Sûreté. Aujourd’hui, la dispersion entre les réactivités simulées avec différentes bibliothèques de données internationales atteint jusqu’à 16% pour les réacteurs à eau légère et les incertitudes associées aux paramètres recommandés restent trop importante pour les besoins de l’industrie. A cela s’ajoute le fait que les matrices de covariance associées aux abondances des NR dans les différentes familles de NR n’ont jamais été évaluées. Jusqu’à présent, les paramètres associés aux NR ont été estimés soit par calculs soit par mesures intégrales.Cette thèse a pour but de produire un nouveau jeu de paramètres pour les NR en conduisant à la fois des calculs et des mesures puis en exploitant ces deux sources grâce à l’assimilation Bayesienne. Cela permettrait de réduire les incertitudes sur les données des NR et de créer les matrices de covariance qui leurs sont associées.Les résultats pour l’235U et les paramètres calculés pour l’238U, ont été testés dans trois benchmarks, en donnant des solutions satisfaisantes par rapport à la fraction effective de neutrons retardés. La réussite principale de ce travail est la grande amélioration de la réactivité prédite, spécialement pour des périodes négatives. De plus, elle est accompagnée par une précision extrêmement bonne, qui ne dépasse jamais 2.2%
Integrated, Automated, and Reproducible Nuclear Data Processing at the NEA
No full textEnsuring data preservation is a top priority for the Organization for Economic Co-operation and Development (OECD), Nuclear Energy Agency (NEA) Data Bank. Within this context, “preserving data” encompasses activities such as verifying, processing, sharing, improving, and storing the data. The NEA aims to automate these processes to the greatest extent possible, with the goal of providing the JEFF community with reproducible, high-quality data. To achieve this, the Data Bank has chosen to utilize GitLab, a web-based distributed Version Control System that facilitates the collaboration of different users. The author will present the current progress of the NEA pipeline, an ongoing collaborative initiative aimed at standardizing the processing, verification, and validation of nuclear data
Energy Dependence of Delayed-Neutron Data
No full textDelayed neutron data is essential in inherent reactor safety and in reactor control. The different sources and results of delayed neutron data in international databases will be discussed. In addition to direct measurement, these data can be obtained by calculations based on fission yields (FY) and radioactive decay data (RDD). Unfortunately, FY are only given at three energies in the European library JEFF. This works proposes to use GEF-FY energy dependence to extrapolate JEFF-FY at other energies. The preliminary results highlight that GEF energy dependence is not always suitable to reproduce experimental values and that more measurements are needed at high energies
Otogenic lateral sinus thrombosis in children: proposal of an experience-based treatment flowchart
No full textPurpose: To describe the prevalent clinical, laboratory, and radiological features of otogenic lateral sinus thrombosis (OLST) in children; to identify clinical predictors of outcome; to propose a management algorithm derived from experience. Methods: A retrospective review was conducted of the clinical records of patients with OLST, treated in a single tertiary care referral center for pediatric disease from 2006 to 2017. The inclusion criteria were pediatric age (0–16 years) and OLST diagnosis confirmed by a pre- and post-contrast CT or venography–MRI scan. Primary outcome measures were early (1–2 months) and late (6 months) sinus recanalization assessed by means of neuroimaging. Results: Twenty-five patients (8 females and 17 males; mean age = 6 ± 3 years) were included. A genetic abnormality associated with thrombophilia was found in 24 (96%) patients. At diagnosis, anticoagulant treatment with low-molecular-weight heparin (LMWH) was started in all subjects, while surgical treatment (mastoidectomy and tympanostomy tube insertion) was performed in 16/25 (64%) patients. Follow-up neuroimaging showed lateral sinus recanalization in 12/25 (48%) patients after 1–2 months and in 17/25 (68%) after 6 months. At multivariate logistic regression analysis, no significant predictors of the early and late neuroradiological outcome were found. Conclusions: All children with OLST should be screened for thrombophilia to decide on treatment duration and to assess the need for future antithrombotic prophylaxis. Immediately after diagnosis, anticoagulant treatment with LMWH should be started according to the international guidelines. Instead, our experience suggests that surgical treatment should not be indicated in all patients, but decided on a case-to-case basis
Uncertainty and covariances of the newly derived 8-groups delayed-neutrons abundances set
No full textDelayed-neutrons are of great importance for reactor operations. Current abundances derive from either a measurement performed in 1957 by Keepin or by a summation calculation performed by Brady and England in 1989. In this work, a code has been written to compute a new set of delayed-neutron abundances as well as to estimate uncertainties and correlations through a Monte Carlo method and a Bayesian inference. An experiment will take place in the future to verify the validity of the calculated quantities
