Excitation rates for transitions in Ca XV

Collision strengths for transitions among the energetically lowest 46 fine-structure levels belonging to the (1s(2)) 2s(2)2p(2), 2s2p(3), 2p(4), and 2s(2)2p3l configurations of Ca XV are computed, over a wide electron energy range below 300 Ryd, using the Dirac Atomic R-matrix Code (DARC) of Norrington & Grant (2003). Resonances in the threshold region have been resolved in a fine energy mesh, and excitation rates are determined over a wide electron temperature range below 10(7) K. The results are compared with those available in the literature, and the accuracy of the data is assessed.

Effective collision strengths for transitions in Fe XV

Collision strengths for transitions among the energetically lowest 53 fine-structure levels belonging to the (1s(2)2s(2)2p(6)) 3l(2), 3l3l', 3s4l and 3p4s configurations of Fe XV are computed, over an electron energy range below 160 Ryd, using the Dirac Atomic R-matrix Code (DARC) of Norrington & Grant (2003). Effective collision strengths, obtained after integrating the collision strengths over a Maxwellian distribution of electron energies, have also been calculated. These results of effective collision strengths are tabulated for all 1378 inelastic transitions over a wide temperature range of 10(5) to 10(7) K. Comparisons are also made with other R-matrix calculations and the accuracy of the results is assessed.

Effective collision strengths for transitions among the 3s(2), 3s3p and 3p(2) configurations of Fe xv

Effective collision strengths for transitions among the ten energetically lowest fine-structure levels belonging to the (1s(2)2s(2)2p(6))3s(2), 3s3p and 3p(2) configurations of Fe xv have been calculated in the electron temperature range of 10(5)-10(7) K, using the recent Dirac atomic R-matrix code of Norrington and Grant. The results are compared with the other recently available independent Breit-Pauli R-matrix calculations of Eissner et al (Eissner W, Galavis M E, Mendoza C and Zeippen C J 1999 Astron. Astrophys. Suppl. 137 165) and Griffin et al (Griffin DC, Badnell N R, Pindzola M S and Shaw J A 1999 J. Phys. B: At. Mol. Opt. Phys. 32 2139, 4129). Large differences are observed for many transitions over almost the entire temperature range. These differences are analysed and discussed, and the accuracy of the calculations is assessed.

Energy levels and radiative rates for transitions in Ar XIII, Ar XIV and Ar XV

Energies for 524 levels of Ar XIII, 460 levels of Ar XIV and 156 levels of Ar XV have been calculated using the GRASP code of Dyall et al. (1989). Additionally, radiative rates, oscillator strengths, and line strengths are calculated for all electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2), and magnetic quadrupole (M2) transitions among these levels. Comparisons are made with the limited results available in the literature, and the accuracy of the data is assessed. Our energy levels are estimated to be accurate to better than 1%, whereas results for other parameters are probably accurate to better than 20%. Additionally, the level lifetimes derived from our radiative rates are in excellent agreement with measured values.

Inner-shell photoexcitation of Fe XV and Fe XVI

The configuration-interaction method as implemented in the computer code CIV3 is used to determine energy levels, electric dipole radiative transition wavelengths, oscillator strengths and transition probabilities for inner-shell excitation of transitions in Fe XV and Fe XVI. Specifically, transitions are considered of the type 1s(2) 2s(2) 2p(6) 3s(2) -1s(2) 2s(2) 2p(5) 3l3l' 3l" (l, l' and l" = s,p or d) in FeXV and 1s(2) 2s(2) 2p(6) 3s- 1s(2) 2s(2) 2p(5) 3l3l' (l and l' = s,p or d) in FeXVI, using the relativistic Breit-Pauli approach. An assessment of the accuracy of the derived atomic data is performed.

An investigation of Fe XV emission lines in solar flare spectra

Previously, large discrepancies have been found between theory and observation for Fe XV emission line ratios in solar flare spectra covering the 224-327 angstrom wavelength range, obtained by the Naval Research Laboratory's S082A instrument on board Skylab. These discrepancies have been attributed to either errors in the adopted atomic data or the presence of additional atomic processes not included in the modelling, such as fluorescence. However our analysis of these plus other S082A flare observations (the latter containing Fe XV transitions between 321-482 angstrom), performed using the most recent Fe XV atomic physics calculations in conjunction with a chianti synthetic flare spectrum, indicate that blending of the lines is primarily responsible for the discrepancies. As a result, most Fe XV lines cannot be employed as electron density diagnostics for solar flares, at least at the spectral resolution of S082A and similar instruments (i.e.similar to 0.1 angstrom). An exception is the intensity ratio I(3s3p P-3(2)-3p(2) P-3(1))/I(3s3p P-3(2)-3p(2) D-1(2))=I(321.8 angstrom)/I(327.0 angstrom), which appears to provide good estimates of the electron density at this spectral resolution.

El conjunto de azulejos nazaríes de principios del siglo XV del Museo Arqueológico de Córdoba

En este trabajo se analiza la iconografía y se concreta la datación y el origen del conjunto de treinta y cinco azulejos nazaríes decorados en cobalto y reflejo metálico procedentes de la que hemos identificado como capilla de Santiago en la antigua iglesia de San Bartolomé, erigida en la Judería de Córdoba tras el asalto de 1391. Se plantea, asimismo, que Diego Fernández Abencaçin, judeoconverso y alfaqueque mayor del rey y presumiblemente el comitente de la capilla funeraria, fue quien adquirió los azulejos. Hasta ahora, la única interpretación de las escenas figuradas que los decoran apuntaba a una supuesta representación de alegorías de los sentidos; no obstante, la comparación con ejemplos paralelos, el estudio de la indumentaria de los personajes y el estilo nos lleva a identificarlas como materialización de los gustos y aficiones de las clases privilegiadas a comienzos del s. XV: el amor cortés, la caza, la fauna, los ministriles –especialmente el ciego acompañado de lazarillo–, las danzarinas y los catadores de vino; costumbres que el alfaqueque conoció durante sus estancias en la corte y en el desempeño de sus obligaciones, no sólo como redentor de cautivos cristianos, sino como trujimán y enviado del infante don Fernando –futuro rey de Aragón– durante la campaña de Antequera ante la corte nazarita de Granada y en las treguas posteriorment e firmadas con Yusuf III, lo que ha posibilitado concretar la datación de los azulejos entre 1410 y 1415.

La contabilità come mezzo per diffondere i valori religiosi. Il caso della diocesi di Ferrara del XV secolo.

Il tema del ruolo della contabilità nella Chiesa, con particolare riferimento al legame esistente tra contabilità e valori religiosi, non appare ad oggi sufficientemente studiato, soprattutto se si considera l’importanza economica e sociale di tale istituzione nel passato e nel presente. Il lavoro intende contribuire a tale indagine analizzando la realtà della Diocesi di Ferrara del XV secolo. Il Quattrocento rappresenta per la Chiesa italiana un’epoca di grande importanza, in quanto caratterizzato da un tentativo di riforma promosso da Papa Eugenio IV, volto a combattere la dilagante corruzione morale all’interno del clero e a riportare quest’ultimo alla sua funzione pastorale. L’appello pontificio venne accolto con particolare attenzione da due vescovi ferraresi, Giovanni Tavelli da Tossignano e Francesco Dal Legname, che attraverso le loro visite pastorali cercarono di divulgare i valori della riforma nella propria Diocesi. La promozione della nuova moralità, nell’esperienza ferrarese, era basata anche sulla diffusione degli strumenti contabili, mezzo essenziale per mettere in luce l’operato dei diversi membri del clero ed in particolare l’utilizzo da parte loro dei beni della Chiesa. Attraverso lo studio di documenti originali del XV secolo, scritti in lingua latina, il contributo si propone di mettere in luce come la contabilità possa assumere un ruolo complementare alla promozione dei valori religiosi.

As terminações nasais nas actas das vereações de Loulé (séc. XIV-XV)

A questão da convergência das terminações -am e -om em -ão tem sido longamente discutida.