1,525 research outputs found
The physics of the extended narrow-line region in active galactic nuclei
No full textThe extended narrow-line region (ENLR) is one of the most interesting and less studied structures typical of active galactic nuclei (AGN). It is made of gas, ionized by the radiation produced in the inner region of the AGN. Its spectral properties are similar to those of the narrow-line region (NLR), but the extension of ENLR is usually larger than 1 kpc (there are objects with ENLR larger than 20 kpc) while the NLR is often concentrated in a radius of some hundreds parsecs from the AGN. In this work I used optical spectra and radio and optical images to investigate the properties of some of these peculiar structures. In particular, I firstly used high resolution spectra and models combining photo-ionization and shocks to study the physical conditions of the gas in the ENLR of two nearby sources, NGC 7212 and IC
5063. The spectral resolution of the data allowed to resolve all the observed lines, which show a complex profile characterized by multiple peaks, asymmetries and bumps. Moreover, it allowed me to investigate the behavior of the gas properties as a function of its velocity. In this way I discovered that, in both AGN, shocks might give an important contribution to the ionization of the gas moving at high velocities. This property, together with the complex kinematics of the gas, might be the result of the interaction between the AGN jets and the interstellar medium (ISM) of the galaxies.
Then, I started investigating the relation between extended optical emission and extended radio emission. For this reason, I looked for new extended radio structures in a VLA survey at 5 GHz of a sample of AGN belonging to the peculiar class of narrow-line Seyfert 1 galaxies (NLS1s). The first and most interesting result of this survey was the discovery of a very interesting radio emission, probably a relic, in Mrk 783, a nearby NLS1. An optical follow-up of the source revealed the presence of an ENLR. The structure is one of the largest discovered so far, with a maximum extension of 38 kpc just aligned with the most extended part of the radio emission. The host galaxy also shows signs of a recent merging with a companion, and it might be in the first stages of interaction with another nearby source
Sperimentazioni didattiche nel progetto di aree di bordo: l'esperienza del laboratorio internazionale per il progetto ambientale LEAP
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David Audretsch: A Source of Inspiration, a Co-author, and a Friend
No full textIn this chapter, Enrico Santarelli discusses the profound impact that David had on his career. Beginning with a conference in Budapest, Santarelli and David bocame close friends and colleagues. They went on to collaborate on many papers and projects, several of which Santarelli highlights below
Dialogo con Enrico Palandri
No full textA conversation with Enrico Palandri aimed at contextualizing his work as an author
A proteomic study of microgravity cardiac effects: feature maps of label-free LC-MALDI data for differential expression analysis
No full textWe present a computational analysis of Mass Spectrometry (MS) data based on a proteomic study of mice cardiac tissue samples whose measured changes in peptide and protein abundance were obtained under normal (control or CTRL) and simulated microgravity conditions (hind-limb unloading or HLU). A pipeline consisting of experimental and computational steps has been designed to achieve, respectively, pre-fractionation to simplify mouse heart protein extracts and data synthesis by feature consensus maps. Both acid and neutral protein fractions obtained from differential solubility have been digested, and peptide mixtures have been resolved by LC-MALDI. The computational tools employed to analyze the MS data and reduce their complex dimensionality have included spectra alignment, denoising and normalization to obtain good-quality peak detection performance. In turn, features could be identified and further refined by searching patterns across repeated measurements obtained under differential conditions (HLU-CTRL, acid-neutral protein extracts). The assessment of reproducibility aspects for evaluating the efficacy of label-free comparative proteomic analysis, combined with the goal of identifying from HLU-CTRL consensus maps candidate proteins with differential expression, led to a computationally efficient approach delivering proteins related to the basic heart functions, cardiac stress and energy supply
Biases and Nudges in the Circular Economy: A Review
No full textThe circular economy transition requires consumers to make further efforts in their waste disposal behaviors, by increasing waste sorting, repairing and reusing products, and reducing the amount of waste produced. The literature has identified several barriers to consumers' adoption of these practices. In this paper, we posit that such barriers can be ultimately linked to well-known decisional biases and proceed to offer a review. In doing so, we categorize biases into "cognitive", referring to deviations from normatively correct behavior, and "motivational", encompassing behavior driven by desirability concerns. We also survey the existing behavioral policies addressing the identified biases, focusing on "nudges", that is, interventions leveraging biases to improve welfare. In our review, we call attention to the importance of recognizing the relevant bias behind specific behaviors to identify the best interventions to implement. By offering a conceptual link between biases and circular economy practices, we also lay the groundwork for future experimental investigation
CONGIU MARISA
No full textThis is a collection of paintings sent to General Thomas P. Stafford after Apollo 10. With them, a note that reads:
The girls of Class III B of the Secondary School \u27Enrico Fermi\u27 of Siliqua (Sardinia, Italy) wish to offer the enclosed folder of drawings regarding the conquest of the Moon. The girls see like this the great journey which you have undertaken and they send this as a token of their deep admiration.
With friendship, The Girls of Class III B.
Unless stated otherwise within this repository collection, all materials are shared under the following Creative Commons license: [Creative Commons Attribution-NonCommercial 4.0 International License].https://dc.swosu.edu/staffpaint/1004/thumbnail.jp
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