A new analysis strategy for detection of faint gamma-ray sources with Imaging Atmospheric Cherenkov Telescopes

A new background rejection strategy for gamma-ray astrophysics with stereoscopic Imaging Atmospheric Cherenkov Telescopes (IACT), based on Monte Carlo (MC) simulations and real background data from the H.E.S.S. [High Energy Stereoscopic System, see [1].] experiment, is described. The analysis is based on a multivariate combination of both previously-known and newly-derived discriminant variables using the physical shower properties, as well as its multiple images, for a total of eight variables. Two of these new variables are defined thanks to a new energy evaluation procedure, which is also presented here. The method allows an enhanced sensitivity with the current generation of ground-based Cherenkov telescopes to be achieved, and at the same time its main features of rapidity and flexibility allow an easy generalization to any type of IACT. The robustness against Night Sky Background (NSB) variations of this approach is tested with MC simulated events. The overall consistency of the analysis chain has been checked by comparison of the real gamma-ray signal obtained from H.E.S.S. observations with MC simulations and through reconstruction of known source spectra. Finally, the performance has been evaluated by application to faint H.E.S.S. sources. The gain in sensitivity as compared to the best standard Hillas analysis ranges approximately from 1.2 to 1.8 depending on the source characteristics, which corresponds to an economy in observation time of a factor 1.4 to 3.2.Comment: 26 pages, 13 figure

High energy blazars spectroscopy with X-Shooter on the VLT

We present results of observations in the UV to near-IR range for eight blazars, three of which have been recently discovered at Very High Energies (VHE) and five appearing as interesting candidates for VHE {\gamma}-ray detection. We focus in this paper on the search for their redshifts, which are unknown or considered as uncertain.Comment: 4 pages, 8 figures, to appear in the proceedings of the 5th International Symposium on High-Energy Gamma-Ray Astronomy (Gamma2012), July 9-13, 2012, Heidelberg, German

Príncipe jardinero y fingido Cloridano

Copia Digital. España : Ministerio de Cultura y Deporte. Subdirección General de Coordinación Bibliotecaria, 2018Precede al tít., en ángulo izquierdo N. 4Datos de impresión tomados del colofónTexto a 2 columnas - ReclamosSig.: A-D4Frisos, florones y asterisco

Spectroscopy of High Energy BL Lac Objects with X-shooter on the VLT

Context. The study of BL Lac objects (BLL) detected in gamma-rays gives insights on the acceleration mechanisms in play in such systems and is also a valuable tool to constrain the density of the extragalactic background light. As their spectra are dominated by the non-thermal emission of the jet and the spectral features are weak and narrow in the optical domain, measuring their redshift is challenging. However such a measure is fundamental as it allows a firm determination of the distance and luminosity of the source, and therefore a consistent model of its emission. Aims. Measurement of the redshift of BLL detected in gamma-rays and determination of global properties of their host galaxies. Methods. We observed a sample of eight BLL (KUV 00311-1938, PKS 0447-439, PKS 0301-243, BZB J0238-3116, BZB J0543-5532, BZB J0505+0415, BZB J0816-1311 and RBS 334) with the X-shooter spectrograph installed at the ESO Very Large Telescope in order to take advantage of its unprecedented wavelength coverage and of its resolution about 5 times higher than generally used in such studies. We extracted UVB to NIR spectra that we then corrected for telluric absorption and calibrated in flux. We systematically searched for spectral features. When possible, we determined the contribution of the host galaxy to the overall emission. Results. Of the eight BLL, we measured the redshift of five of them and determined lower limits for two through the detection of intervening systems. All seven of these objects have redshifts greater than 0.2. In two cases, we refuted redshift values reported in other publications. Through careful modelling, we determined the magnitude of the host galaxies. In two cases, the detection of emission lines allowed to provide hints on the overall properties of the gas in the host galaxies.Comment: 19 pages, 10 figures, 7 tables, in press on A&

El Principe jardinero y fingido cloridano : comedia en tres actos

H HAZ/3778(14

The Effect of Surface Roughness on the Contact Line and Splashing Dynamics of Impacting Droplets

Whether a droplet splashes upon impact onto a solid is known to depend not only on the fluid properties and its speed, but also on the substrate characteristics. Past research has shown that splashing is heavily influenced by the substrate roughness. Indeed, in this manuscript, we demonstrate that splashing is ruled by the surface roughness, the splashing ratio, and the dynamic contact angle. Experiments consist of water and ethanol droplets impacting onto solid substrates with varying degrees of roughness. High speed imaging is used to extract the dynamic contact angle as a function of the spreading speed for these impacting droplets. During the spreading phase, the dynamic contact angle achieves an asymptotic maximum value, which depends on the substrate roughness and the liquid properties. We found that this maximum dynamic contact angle, together with the liquid properties, the ratio of the peak to peak roughness and the surface feature mean width, determines the splashing to no-splashing threshold. In addition, these parameters consistently differentiate the splashing behaviour of impacts onto smooth hydrophilic, hydrophobic and superhydrophobic surfaces

Quality of Life in Cohabitants of Patients with Hidradenitis Suppurativa: A Cross-sectional Study

The following are available online at http://www.mdpi.com/1660-4601/17/16/6000/s1, Table S1: Sociodemographic variables of patients and cohabitants; Table S2: Clinical variables of patients with hidradenitis suppurativa.Hidradenitis suppurativa (HS) is a chronic inflammatory disease that impairs patients’ physical and mental health. However, few studies have considered the consequences of HS on cohabitants. The aims of this study were to explore the impact of HS on the quality of life (QOL) of cohabitants and to assess potentially associated factors. A cross-sectional study was conducted and patients with HS and their cohabitants were invited to participate. Validated questionnaires were used to measure QOL, anxiety and depression, type D personality and sexual dysfunction. The clinical variables of patients and the demographic characteristics of cohabitants were also collected. Twenty-seven patients and 27 cohabitants were included for analysis. Patients and cohabitants presented significant QOL impairment. A direct association was found between the Dermatology Life Quality Index (DLQI) and the Familiar Dermatology Life Quality Index (FDLQI). DLQI scores were associated with the presence of negative affectivity, a trait typical of type D personality, as well as with cohabitants’ anxiety. FDLQI scores were associated with cohabitant anxiety and patient depression. Hidradenitis suppurativa damages quality of life in patients and cohabitants. Identifying potential psychological factors could help us to recognize at-risk patients and apply personalized treatments for them and their environment

The Role of the Dynamic Contact Angle on Splashing

In this letter we study the splashing behaviour of droplets upon impact onto a variety of substrates with different wetting properties, ranging from hydrophilic to super-hydrophobic surfaces. In particular, we study the effects of the dynamic contact angle on splashing. The experimental approach uses high-speed imaging and image analysis to recover the apparent contact angle as a function of the spreading speed. Our results show that neither the Capillary number nor the so-called splashing parameter are appropriate to characterise the splashing behaviour under these circumstances. However, we show that the maximum dynamic advancing contact angle and the splashing ratio β adequately characterise the splashing behaviour

Estudo comparativo de códigos deontolóxicos no ámbito da xestión dixital da información e a documentación. O caso de España, Reino Unido e Estados Unidos

[Resumo] Realízase unha comparativa entre os códigos deontolóxicos de España, Reino Unido e Estados Unidos, no ámbito da Xestión Dixital da Información e a Documentación, cos engadidos de extraer propostas de mellora para España e indicar en que aspectos coincide este país con Reino Unido e Estados Unidos. Os códigos deontolóxicos escollidos son os propios das profesións e ámbitos profesionais da rama máis característica do ámbito mencionado, cuxas profesións derivadas son, principalmente, científico/a de datos, community manager, business intelligence, produtor/a de contidos dixitais e enxeñeiro/a de datos. Os resultados obtidos non mostran códigos deontolóxicos senón, máis ben, manuais de boas prácticas, que inclúen principios de protección de datos, códigos éticos para a Ciencia de Datos, ética do Big Data e principios éticos de datos federais, entre outros aspectos, que mencionan cuestións como a transparencia á hora de tratar os datos, o respecto pola propiedade intelectual, a necesidade de explicar para que se recollen os datos, e o rumbo e a obxectividade nos algoritmos. Conclúese que, polo momento, non existen códigos deontolóxicos para os ámbitos profesionais da Xestión Dixital da Información e a Documentación, polo que resulta necesario seguir observando a evolución deste campo profesional.[Resumen] Se realiza una comparativa entre los códigos deontológicos de España, Reino Unido y Estados Unidos, en el ámbito de la Gestión Digital de la Información y la Documentación, con los añadidos de extraer propuestas de mejora para España e indicar en qué aspectos coincide este país con Reino Unido y Estados Unidos. Los códigos deontológicos escogidos son los propios de las profesiones y ámbitos profesionales de la rama más característica del ámbito mencionado, cuyas profesiones derivadas son, principalmente, científico/a de datos, community manager, business intelligence, productor/a de contenidos digitales e ingeniero/a de datos. Los resultados obtenidos no muestran códigos deontológicos sino, más bien, manuales de buenas prácticas, que incluyen principios de protección de datos, códigos éticos para la Ciencia de Datos, ética del Big Data y principios éticos de datos federales, entre otros aspectos, que mencionan cuestiones como la transparencia a la hora de tratar los datos, el respeto por la propiedad intelectual, la necesidad de explicar para qué se recogen los datos, y el sesgo y la objetividad en los algoritmos. Se concluye que, por el momento, no existen códigos deontológicos para los ámbitos profesionales de la Gestión Digital de la Información y la Documentación, por lo que resulta necesario seguir observando la evolución de este campo profesional.[Abstract] A comparison is made between the deontological codes of Spain, the United Kingdom and the United States, in the field of Digital Information and Documentation Management, with the added purpose of extracting proposals for improvement for Spain and indicating in which aspects this country coincides with the United Kingdom and the United States. The deontological codes chosen are those of the professions and professional fields of the most characteristic branch of the aforementioned field, whose derived professions are mainly data scientists, community managers, business intelligence, digital content producers and data engineers. The results obtained do not show deontological codes but, rather, good practice manuals, which include data protection principles, ethical codes for Data Science, Big Data ethics and federal data ethics principles, among other aspects, which mention issues such as transparency when dealing with data, respect for intellectual property, the need to explain what the data is collected for, and bias and objectivity in algorithms. It is concluded that, for the moment, there are no deontological codes for the professional fields of Digital Information and Documentation Management, so it is necessary to continue observing the evolution of this professional field.Traballo fin de grao (UDC.FHD). Xestión Dixital en Información e Documentación. Curso 2022/202