Search results for "MNA"
showing 10 items of 1167 documents
X-raying the interstellar medium: the study of SNR shells at the OAPa
2006
Salones de París / 3: Un café para Sócrates
2006
Autoritarismo global
2003
Latinoamérica y Vargas Llosa / 1
2006
FIRST RECORD IN EUROPE OF SEEDLINGS OF FICUS MACROPHYLLA F. COLUMNARIS (Moraceae) AND OF ITS POLLINATING WASP PLEISTODONTES CF. IMPERIALIS (Chalcidoi…
2015
Since the first half of the nineteenth century, several Ficus species have been introduced into Italy as ornamental trees throughout urban gardens and along urban roads. Because a relationship with an agaonid wasp is essential for the pollination and consequently for the production of fertile seeds of Ficus spp., the seedlings of other introduced fig species (Ficus microcarpa L. f., Ficus rubiginosa Desf. ex Vent. and Ficus watkinsiana F.M. Bailey) weren’t found in Europe in conjunction with their pollinating wasps until more than a century after the figs’ introduction. This study presents the first recorded observation of Ficus macrophylla f. columnaris (C. Moore) D. J. Dixon seedlings in …
Primo reperto di una lenticchia d'acqua alloctona in Sicilia: Lemna minuta KUNTH (Araceae Lemnoideae)
2011
La presenza di Lemna minuta, una lenticchia d’acqua originaria delNord America, viene segnalata per la prima volta in Sicilia nel gorgo di Santa Rosalia, uno stagno temporaneo mediterraneo localizzato sul promontorio di Monte Pellegrino, Palermo. Lo specchio d’acqua risulta completamente ricoperto da questa pleustofita galleggiante, che impedisce la penetrazione della luce nella colonna d’acqua e non consente la crescita della vegetazione micro- e macroalgale. La repentina e perdurante invasione di Lemna minuta nello stagno, creando condizioni di ipossia nella colonna d’acqua, costituisce un potenziale rischio per l’intero biota del sito. Lemna minuta, an allochthonous duckweed from North A…
A Spatially Resolved Study of Hard X-Ray Emission in Kepler’s Supernova Remnant: Indications of Different Regimes of Particle Acceleration
2022
Abstract Synchrotron X-ray emission in young supernova remnants (SNRs) is a powerful diagnostic tool to study the population of high-energy electrons accelerated at the shock front and the acceleration process. We performed a spatially resolved spectral analysis of NuSTAR and XMM-Newton observations of the young Kepler’s SNR, aiming to study in detail its nonthermal emission in hard X-rays. We selected a set of regions all around the rim of the shell and extracted the corresponding spectra. The spectra were analyzed by adopting a model of synchrotron radiation in the loss-limited regime, to constrain the dependence of the cutoff energy of the synchrotron radiation on the shock velocity. We …
Analysis of the XMM-Newton observations of IC443
2017
We analyze for the first time the full set of archive XMM-Newton EPIC observations of the Galactic Supernova Remnant IC 443. We aim at identifying the contribution of the shocked ejecta and interstellar medium and at the describing the physical and chemical properties of the shocked plasma. We also aim at addressing the presence of overionized plasma and its physical origin. We trace the morphology of Si- and S-rich ejecta with unprecedented spatial resolution, by adopting a novel method to produce maps of equivalent width. We describe in detail the method adopted and the results obtained and present preliminary results of a spatially resolved spectral analysis performed on selected regions…
L’azione di condanna nel codice del processo amministrativo: spunti per una diversa ricostruzione
2022
The essay, retracing the historical coordinates of the condemnation action in the administrative judgment, traces its evolutionary features, proposing an autonomous reconstruction of the discipline, in order to strengthen the protection of the private subject, against the omitted or illegitimate exercise of the public function.
Collisionless shock heating of heavy ions in SN 1987A
2019
Astrophysical shocks at all scales, from those in the heliosphere up to the cosmological shock waves, are typically "collisionless", because the thickness of their jump region is much shorter than the collisional mean free path. Across these jumps, electrons, protons, and ions are expected to be heated at different temperatures. Supernova remnants (SNRs) are ideal targets to study collisionless processes because of their bright post-shock emission and fast shocks. Although optical observations of Balmer-dominated shocks in young SNRs showed that the post-shock proton temperature is higher than the electron temperature, the actual dependence of the post-shock temperature on the particle mass…