Search results for "Planet"

VLBA polarimetric monitoring of 3C 111

2018

Context. While studies of large samples of jets of active galactic nuclei (AGN) are important in order to establish a global picture, dedicated single-source studies are an invaluable tool for probing crucial processes within jets on parsec scales. These processes involve in particular the formation and geometry of the jet magnetic field as well as the flow itself. Aims. We aim to better understand the dynamics within relativistic magneto-hydrodynamical flows in the extreme environment and close vicinity of supermassive black holes. Methods. We analyze the peculiar radio galaxy 3C 111, for which long-Term polarimetric observations are available. We make use of the high spatial resolution of…

Nouvelles données sur le genre Bragasellus (Crustacea: Isopoda: Asellidae

1996

From now on, the genus Bragasellus Henry & Magniez, 1968 includes 2 oculated and 17 stygobiotic species. As a natural and monophyletic taxonomic unit, we consider it a good genus. Its original area corresponds to the north-west quarter of the Iberian Peninsula. Secondarily, this area has extended eastward, using mainly the alluvial channels of hydrographic systems (Ríos Douro + Ebro and tributaries), finally reaching the underground waters of several Mediterranean rivers. This active expansion is exclusively due to the migration of two stygobiotic sibling species: B. lagari Henry & Magniez, 1973 towards the high basin of the Río Tajo, then downstream to the basins of the Ríos Jucar and Turi…

PLANETS AROUND LOW-MASS STARS AND STELLAR ACTIVITY EFFECTS

In the last years the field of exoplanet research has focused its interest in M dwarfs. These stars have became the favourite targets in radial velocity surveys, specially when looking for small planets in the habitable zones of their parent stars. Not only for being the M dwarfs the most common objects in our Galaxy also because the Doppler signals due to small planets orbiting around them are larger and more easily detectable than those around FGK stars. However, stellar magnetic activity and rotation affect the measured radial velocities as surface inhomogeneities rotating with the stellar surface can cause periodic changes in the spectral line centroid. Disentangle these stellar activit…

Formare gli studenti universitari alla Cittadinanza Digitale

2023

Today digital media are configured as social environments that expand our personal, cultural, social and educational reality, therefore measuring citizens’ activities in online environments is of fundamental importance. In the last decade, different scholars have proposed different definitions of the digital citizenship and different measurement tools. Most definitions focus on two conceptions of digital citizenship, some more inherent in digital skills and others centered on critical aspects and civic engagement. In this study, we present the translation and Italian adaptation of two scales: the Digital Citizenship Scale by Al-Zahrani (2015) and the Digital Citizenship Scale by Choi, Glass…

Multitemporal Unmixing of Medium-Spatial-Resolution Satellite Images: A Case Study Using MERIS Images for Land-Cover Mapping

2011

Data from current medium-spatial-resolution imaging spectroradiometers are used for land-cover mapping and land-cover change detection at regional to global scales. However, few landscapes are homogeneous at these scales, and this creates the so-called mixed-pixel problem. In this context, this study explores the use of the linear spectral mixture model to extract subpixel land-cover composition from medium-spatial-resolution data. In particular, a time series of MEdium Resolution Imaging Spectrometer (MERIS) full-resolution (FR; pixel size of 300 m) images acquired over The Netherlands is used to illustrate this study. The Netherlands was selected because of the following: 1) the fragmenta…

Predicció d'estratègies d'afrontament a partir de dimensions emocionals, en infants i adolescents

2019

espanolEl objetivo de la presente investigacion consiste en analizar la prediccion de estrategias de afrontamiento a partir de las dimensiones de inteligencia emocional, y los trastornos de la emocion de ansiedad y depresion. Participaron 147 estudiantes de Primaria y ESO −49% de hombres y 49% mujeres− con edades comprendidas entre 12 y 14 anos. Los instrumentos utilizados fueron: una escala para evaluar las estrategias de afrontamiento, un inventario emocional, un cuestionario educativo-clinico para evaluar ansiedad/ depresion; y un cuestionario para la autoevaluacion ansiedad estado/rasgo. Para la valoracion de los datos se realizaron distintos analisis de regresion simple y multiple. Los…

Il percorso temporale soggettuale come linea guida del macro-processo psicoanalitico

2022

L’autore, con il seguente scritto, propone una sua personale rivisitazione della lettura del processo psicoanalitico, partendo da un percorso soggettuale che si sviluppa a partire dalle prime relazioni con il caregiver, all’interno di un funzionamento generale dei sistemi dinamici complessi non lineari. Viene proposto, rispetto ad ogni passaggio (coscienza - coscienza della coscienza - creatività) come evoluzione del processo esposto precedentemente da Minolli (2015), la costruzione di un percorso temporale soggettuale all’interno dell’auto-(geno-feno)-organizzazione (Morin, 1980). Tale lettura del macro-processo (che interessa lunghi periodi del percorso analitico), dovrà essere successiva…

Evaluation of Landscape Quality in Valencia's Agricultural Gardens : a Method Adapted to Multifunctional, Territorialized Agrifood Systems (MTAS)

2022

Multifunctional agrifood systems with noteworthy roots in a territory are the result of a historical yet dynamic specialization. They are present in the place’s knowledge, social connections, collective action, the organization of institutions, innovation and capital. These systems are seen in the landscape, which becomes a resource as well as cultural and environmental heritage. In this regard, it is necessary to study the significance of the many aspects of heritage and landscape in agrifood systems to suitably manage and appreciate them as a territorial resource. This study develops and applies a quantitative method with various criteria to enable the landscape values of multifunctional,…

Forest accessibility, Madonie mountains (northern Sicily, Italy): implementing a GIS decision support system

2021

Valorisation and sustainable exploitation of woody biomass from cultivation interventions might be an important opportunity to track alternative development trails for rural communities in natural protected areas. The governance of Mediterranean protected areas is characterized by overlapping, sometimes conflicting institutions, stakeholders and regulations, causing negative impacts on decision-making processes. We present an open source GIS-based decision support system tool for mapping forest accessibility and optimizing woody biomass extraction. Two models were implemented to support forest managers during the decision-making process in designing and managing wood-energy supply chains. T…

The young hard active Sun: soft X-ray irradiation of tryptophan in water solutions

2010

AbstractThe X-ray emission of the young Sun was much harder and intense than today and might have played a significant role in the evolution of complex organics in protoplanetary environments. We investigate the effects of soft X-rays on tryptophan molecules in aqueous solutions at room temperature. As results of the irradiation experiments we detect several light species indicative of fragmentation, together with large molecular structures such as tryptophan dipeptide and tripeptide. Complexification is more evident in H2O solution than in D2O, probably due to isotopic effects. The abundances of peptides depend on the irradiation dose and decrease with increasing energy deposition. Radical…