De Sacrosancto Eucharistie Sacramento & de eiusdê ministro noua admodum & facillima quotlibeta [Texto impreso]

Hay un ejemplar encuadernado con: De prima Orbis Sede, de Concilio & Ecclesiastica potestate ac de S. D. N. Papa Supraemo insuperabiliq. dominio Opus (XVI/270).Pie de imp. tomado de colofónSign.: A-C

Tractatus de autoritate Ro. Eccle. magistri Cypriani Beneti. [Texto impreso]

Hay un ejemplar encuadernado con: De prima Orbis Sede, de Concilio & Ecclesiastica potestate ac de S. D. N. Papa Supraemo insuperabiliq. dominio Opus (XVI/270).Según ICCU, publicado probablemente en Roma por Marcello Silber, ca. 1512Sign.: A-B4, C6Frontispicio xil.Última h. en bl

The cataclysmic variable SDSS J1507+52: An eclipsing period bouncer in the Galactic halo

SDSS J1507+52 is an eclipsing cataclysmic variable consisting of a cool, non-radially pulsating white dwarf and an unusually small sub-stellar secondary. The system has a high space velocity and a very short orbital period of about 67 minutes, well below the usual minimum period for CVs. To explain the existence of this peculiar system, two theories have been proposed. One suggests that SDSS J1507+52 was formed from a detached white-dwarf/brown-dwarf binary. The other theory proposes that the system is a member of the Galactic halo-population. Here, we present ultraviolet spectroscopy of SDSS J1507+52 obtained with the Hubble Space Telescope with the aim of distinguishing between these two theories. The UV flux of the system is dominated by emission from the accreting white dwarf. Fits to model stellar atmospheres yield physical parameter estimates of T(eff) = 14200 \pm 500 K, log(g)=8.2 \pm 0.3, vsin(i)=180 \pm 20 kms-1 and [Fe/H]=-1.2 \pm 0.2. These fits suggest a distance towards SDSS J1507+52 of d = 250 \pm 50 pc. The quoted uncertainties include systematic errors associated with the adopted fitting windows and interstellar reddening. Assuming that there is no contribution to the UV flux from a hot, optically thick boundary layer, we find a T(eff) much higher than previously estimated from eclipse analysis. The strongly sub-solar metallicity we infer for SDSS J1507+52 is consistent with that of halo stars at the same space velocity. We therefore conclude that SDSS J1507+52 is a member of the Galactic halo

Thulium environment in a silica doped optical fibre

Thulium-doped optical fibre amplifiers (TDFA) are developed to extend the optical telecommunication wavelength division multiplexing (WDM) bandwidth in the so-called S-band (1460-1530 nm). The radiative transition at 1.47 lm (3H4 -> 3F4) competes with a non-radiative multi-phonon de-excitation (3H4 -> 3H5). The quantum efficiency of the transition of interest is then highly affected by the phonon energy (Ep) of the material. For reliability reasons, oxide glasses are preferred but suffer from high phonon energy. In the case of silica glass, Ep is around 1100 cm-1 and quantum efficiency is as low as 2%. To improve it, phonon energy in the thulium environment must be lowered. For that reason, aluminium is added and we explore three different core compositions: pure silica, and silica slightly modified with germanium or phosphorus. The role of aluminium is studied through fluorescence decay curves, fitted according to the continuous function decay analysis. From this analysis, modification of the thulium local environment due to aluminium is evidenced

Femtosecond laser-written waveguides in thulium-doped fluoroindate glass for S-band amplification

Channel waveguides were written in a fluoroindate bulk glass containing thulium, with a femtosecond laser operating at 800 nm, 100 fs pulses and repetition rate 1 kHz. Formation of waveguides occurred for average powers from 1 to 8 mW (corresponding to energies of 1 to 8 microJ) and scan velocities in the range 0.1 to 4 mm/s. Passive optical characterization included visual inspection by optical microscope, insertion loss and mode profile. Active characterization was performed by co-propagating pumping in a dual-pump scheme that included a 808 nm and a 1054 nm laser diode for an efficient inversion of the $^3$H$_4$ level which is responsible for stimulated emission in the 1460-1530 nm spectral range. Preliminary tests show a net gain of 2.5 dB at 1487 nm, for straight waveguides 1 cm long. Applications include the fabrication of lossless components working in the S-band region of the optical communication spectrum

La fête imprévue : entrées royales et solennelles à Lyon (1460–1530)

Au tournant du xvie siècle, la ville de Lyon a accueilli à de nombreuses reprises les souverains français et étrangers ainsi que des personnages ecclésiastiques d’importance. Évidemment, les entrées royales et solennelles ne sont pas les seules occasions de travail pour peintres, sculpteurs ou orfèvres : quelques rares mystères, des tournois, les naissances royales incitent les consuls à faire appel à eux, le plus souvent pour réaliser des écussons aux armes de la ville ou de la personne fêté..

Ceramic Beads from the Cloud Hammond Site (41SM244), Smith County, Texas

During investigations at the Cloud Hammond site (41SM244) during the 1960s, J. A. Walters recovered Caddo ceramics, two clay beads, Perdiz arrow points, and two Gary dart points. The site is located in northern Smith County, Texas, about 400 m east of the Middle Caddo period Jamestown Mound site (41SM54). Of the artifacts reported to have been recovered from the site, only one clay bead was available for study. No record survives of the extent of investigations at the Cloud Hammond site or if any cultural features such as burials were found during the 1960s work

Optical and electronic properties of low-density InAs/InP quantum dot-like structures devoted to single-photon emitters at telecom wavelengths

Due to their band-structure and optical properties, InAs/InP quantum dots (QDs) constitute a promising system for single-photon generation at third telecom window of silica fibers and for applications in quantum communication networks. However, obtaining the necessary low in-plane density of emitters remains a challenge. Such structures are also still less explored than their InAs/GaAs counterparts regarding optical properties of confined carriers. Here, we report on the growth via metal-organic vapor phase epitaxy and investigation of low-density InAs/InP QD-like structures, emitting in the range of 1.2-1.7 ${\mu}$m, which includes the S, C, and L bands of the third optical window. We observe multiple photoluminescence (PL) peaks originating from flat QDs with height of small integer numbers of material monolayers. Temperature-dependent PL reveals redistribution of carriers between families of QDs. Via time-resolved PL, we obtain radiative lifetimes nearly independent of emission energy in contrast to previous reports on InAs/InP QDs, which we attribute to strongly height-dependent electron-hole correlations. Additionally, we observe neutral and charged exciton emission from spatially isolated emitters. Using the 8-band k${\cdot}$p model and configuration-interaction method, we successfully reproduce energies of emission lines, the dispersion of exciton lifetimes, carrier activation energies, as well as the biexciton binding energy, which allows for a detailed and comprehensive analysis of the underlying physics.Comment: 13 pages, 9 figure