Xarxa RESTAURO. Projecte d'una plataforma per a la comunicació en I'ambit de la Conservació-Restauració a Catalunya

La restauració és una disciplina que moltes vegades es caracteritza per saber incorporar noves tècniquesi solucions basades en les innovacions que es produeixen en altres sectors més o menys afins, des dela medicina, fins a les ciències experimentals, la informàtica o I'enginyeria, entre tantes d'altres.Aquesta capacitat desacomplexada de treballar de manera interdisciplinar amb altres professionalssol ser pal de palier de I'ideari de la restauració, contribuint en gran mesura al seu creixement i a larecerca de noves tècniques i solucions.Tot i això, potser la comunicació i difusió de les intervencions de restauració sigui un dels àmbitsen els quals tinguem més camp per recórrer, per tal d'aconseguir obrir la restauració i els seusconeixements al públic general. Un treball costós que s'ha d'abordar transversalment però que ens pot oferir la complicitat i el recolzament social que requereix una professió que treballa amb el patrimoni col·lectiu . Ja que com a custodis de I'art, potser també tinguem un deure envers el retorn d'aquest a la societat.Amb aquest projecte s'analitza aquesta situació específica i es pretén oferir una proposta de plataforma on-line per difondre i promoure les intervencions de restauració en tot l'àmbit català, segons el context i les oportunitats actuals.D'aquesta manera, la xarxa RESTAURO busca promoure I'accés i la difusió de les intervencions de conservació i restauració que es realitzen sobre el patrimoni moble català per tal d'aprofundir en lavivència i el coneixement del mate ix per part del públic general.No satisfà donar una imatge estàtica i finalitzada del patrimoni, sinó que es vol que el ciutadà puguiconèixer la importància de les tasques de restauració i conservació en I'apreciació dels monuments o obres d'art i la seva imatge actual.

Deployment of self-expandable stents in aneurysmatic cerebral vessels: comparison of different computational approaches for interventional planning

In the last few years, there has been a growing focus on faster computational methods to support clinicians in planning stenting procedures. This study investigates the possibility of introducing computational approximations in modelling stent deployment in aneurysmatic cerebral vessels to achieve simulations compatible with the constraints of real clinical workflows. The release of a self-expandable stent in a simplified aneurysmatic vessel was modelled in four different initial positions. Six progressively simplified modelling approaches (based on Finite Element method and Fast Virtual Stenting – FVS) have been used. Comparing accuracy of the results, the final configuration of the stent is more affected by neglecting mechanical properties of materials (FVS) than by adopting 1D instead of 3D stent models. Nevertheless, the differencesshowed are acceptable compared to those achieved by considering different stent initial positions. Regarding computationalcosts, simulations involving 1D stent features are the only ones feasible in clinical context.

Silicon quantum dots embedded in a SiO2 matrix: From structural study to carrier transport properties

We study the details of electronic transport related to the atomistic structure of silicon quantum dots embedded in a silicon dioxide matrix using ab initio calculations of the density of states. Several structural and composition features of quantum dots (QDs), such as diameter and amorphization level, are studied and correlated with transport under transfer Hamiltonian formalism. The current is strongly dependent on the QD density of states and on the conduction gap, both dependent on the dot diameter. In particular, as size increases, the available states inside the QD increase, while the QD band gap decreases due to relaxation of quantum confinement. Both effects contribute to increasing the current with the dot size. Besides, valence band offset between the band edges of the QD and the silica, and conduction band offset in a minor grade, increases with the QD diameter up to the theoretical value corresponding to planar heterostructures, thus decreasing the tunneling transmission probability and hence the total current. We discuss the influence of these parameters on electron and hole transport, evidencing a correlation between the electron (hole) barrier value and the electron (hole) current, and obtaining a general enhancement of the electron (hole) transport for larger (smaller) QD. Finally, we show that crystalline and amorphous structures exhibit enhanced probability of hole and electron current, respectively.

Stratification of the severity of critically ill patients with classification trees

Background: Development of three classification trees (CT) based on the CART (Classification and Regression Trees), CHAID (Chi-Square Automatic Interaction Detection) and C4.5 methodologies for the calculation of probability of hospital mortality; the comparison of the results with the APACHE II, SAPS II and MPM II-24 scores, and with a model based on multiple logistic regression (LR). Methods: Retrospective study of 2864 patients. Random partition (70:30) into a Development Set (DS) n = 1808 and Validation Set (VS) n = 808. Their properties of discrimination are compared with the ROC curve (AUC CI 95%), Percent of correct classification (PCC CI 95%); and the calibration with the Calibration Curve and the Standardized Mortality Ratio (SMR CI 95%). Results: CTs are produced with a different selection of variables and decision rules: CART (5 variables and 8 decision rules), CHAID (7 variables and 15 rules) and C4.5 (6 variables and 10 rules). The common variables were: inotropic therapy, Glasgow, age, (A-a)O2 gradient and antecedent of chronic illness. In VS: all the models achieved acceptable discrimination with AUC above 0.7. CT: CART (0.75(0.71-0.81)), CHAID (0.76(0.72-0.79)) and C4.5 (0.76(0.73-0.80)). PCC: CART (72(69- 75)), CHAID (72(69-75)) and C4.5 (76(73-79)). Calibration (SMR) better in the CT: CART (1.04(0.95-1.31)), CHAID (1.06(0.97-1.15) and C4.5 (1.08(0.98-1.16)). Conclusion: With different methodologies of CTs, trees are generated with different selection of variables and decision rules. The CTs are easy to interpret, and they stratify the risk of hospital mortality. The CTs should be taken into account for the classification of the prognosis of critically ill patients.

Optimized dark matter searches in deep observations of Segue 1 with MAGIC

We present the results of stereoscopic observations of the satellite galaxy Segue 1 with the MAGIC Telescopes, carried out between 2011 and 2013. With almost 160 hours of good-quality data, this is the deepest observational campaign on any dwarf galaxy performed so far in the very high energy range of the electromagnetic spectrum. We search this large data sample for signals of dark matter particles in the mass range between 100 GeV and 20 TeV. For this we use the full likelihood analysis method, which provides optimal sensitivity to characteristic gamma-ray spectral features, like those expected from dark matter annihilation or decay. In particular, we focus our search on gamma-rays produced from different final state Standard Model particles, annihilation with internal bremsstrahlung, monochromatic lines and box-shaped signals. Our results represent the most stringent constraints to the annihilation cross-section or decay lifetime obtained from observations of satellite galaxies, for masses above few hundred GeV. In particular, our strongest limit (95% confidence level) corresponds to a ~ 500 GeV dark matter particle annihilating into τ+τ−, and is of order langleσannvrangle simeq 1.2 × 10−24 cm3 s−1 a factor ~ 40 above the langleσannvrangle simeq thermal value.

Guercino (1591-1666). Capolavori da Cento e da Roma

Un dels molts actes amb què la ciutat de Roma ha celebrat els 150 anys de la unificació d"Itàlia (1861˗2011) ha estat la presentació oficial del complex i acurat procés de restauració del Palazzo Barberini (1625˗1633). Restauració de l"edifici i, alhora, reestructuració de l"espai expositiu i del discurs museogràfic de la Galleria Nazionale di Arte Antica, dirigit tot per Rossella Vodret, reconeguda historiadora de l"art i Soprintendente per il Patrimonio Storico Artistico e del Polo Museale di Roma.