Nematodos de la subfamilia Criconematinae (Nematoda: Criconematidae) en la España peninsular

Se realiza un estudio de las caracteristicas morfológicas y morfométricas de los nematodos de la subfamilia Criconematinae encontrados en España peninsular, se describen machos de Seriespinula allieri y se incluye una clave para la identificación de las especies encontradas.Se han encontrado trece especies pertenecientes a los géneros Criconema, Croserinema, Crossonema, Ogma y Seriespinula. Las especies de la subfamilia Criconematinae aparecen con mayor frecuencia en los ecosistemas naturales que en los cultivos. Crossonema menzeli sólo se ha encontrado en hayedos, C. multisquamatum aparece en cítricos y Criconema mutabile en cultivos horticolas del sur peninsular y en frutales en la mitad norte peninsular.A morphological and morphometrical study of the nematodes from subfamily Criconematinae in Peninsular Spain is carried out, male of Seriespinula allieri is reported and a key for identification of species found is provided. Thirteen species have been found belonging to the genera Criconema, Croserinema, Crossonema, Ogma and Seriespinula. The species of Criconematinae appear mostly in natural ecosistems. Crossonema menzeli has been found only in beech forests, C. multisquamatum in citrus orchards and Criconema mutabile in vegetables crops in Southern Spain and in fruit orchards in the half Northern of Spain

El impacto de las redes de apoyo en el bienestar. Una propuesta de análisis

Podeu consultar el document complet a: http://hdl.handle.net/2445/5858

Beyond compulsory schooling: resilience and academic success of immigrant youth

The present study examines the relationship between resilience and school completion of immigrant youth in Spain. Ninety- four students in their fourth year compulsory education participated in the study; they were from 19 different nationalities, between 15 and 18 years of age, and the ratio boys/girls was 55/45. There were no significant differences by gender, age, residence time, or incorporation into the education system. Differences were associated to cultural groups and variables related with academic self-perception. Finally, it was shown that young students that continue their studies beyond obligatory education have higher levels of resilience, as measured by the SV-RES scale. Overall, the findings in this study suggest the activation of the relational dimension of "social capital" in youth, as for example through mentoring or service-learning programs

Social interactions and language use in multicultural settings: an exploratory study of personal networks

This study tests the use of social network analysis in the diagnostics of personal communities as relational systems that affect how languages are learned. The egocentric approach of this methodology was applied to identifying the personal networks of adult immigrants attending a literacy program. The study is an exploratory and descriptive analysis with EgoNet software based on five cases. The results show small networks with few significant 'alters' (five to eight), without weak ties in areas of relationship with neighbours or other acquaintances, and in which the prevailing language of communication was the same as that of 'ego' - with, in some cases, multicultural networks using different languages of communication

Exploring the epoch of hydrogen reionization using FRBs

We describe three different methods for exploring the hydrogen reionization epoch using fast radio bursts (FRBs) and provide arguments for the existence of FRBs at high redshift (z). The simplest way, observationally, is to determine the maximum dispersion measure (DM_(max)) of FRBs for an ensemble that includes bursts during the reionization. The DM_(max) provides information regarding reionization much like the optical depth of the CMB to Thomson scattering does, and it has the potential to be more accurate than constraints from Planck, if DM_(max) can be measured to a precision better than 500 pc cm⁻³. Another method is to measure redshifts of about 40 FRBs between z of 6-10 with∼10% accuracy to obtain the average electron density in 4 different z-bins with ∼4% accuracy. These two methods don't require knowledge of the FRB luminosity function and its possible redshift evolution. Finally, we show that the reionization history is reflected in the number of FRBs per unit DM, given a fluence limited survey of FRBs that includes bursts during the reionization epoch; we show using FIRE simulations that the contributions to DM from the FRB host galaxy & CGM during the reionization era is a small fraction of the observed DM. This third method requires no redshift information but does require knowledge of the FRB luminosity function

Education to gain sustainability : analysis and approach from the experience obtained from two high school systems in mexican rural communities

The decade &ldquo;Education for Sustainability&rdquo; is just emerging and one of its goals emphasized the importance of considering the curr&iacute;cula in a transdisciplinary and community based programs. This includes recognizing local and regional interests as relevant topics into the curr&iacute;cula. &ldquo;Education for sustainability&rdquo; does not appear to have a strong basis on their actions as its theoretical discourse does. The study we present here about content analysis in the curricula of two high schools systems in rural Mexican communities is an example. In this research we analyzed: 1) how the curricula is oriented towards forest management and the way is connected to the social reality of the communities; 2) how does the learning process develops in the classroom and its dynamics with teachers and students and 3) how does the environmental learning take place. Results revealed that more research is needed with adolescents in order to change the educational structure in rural Mexican high schools.<br /

Large scale anisotropies on halo infall

We perform a statistical analysis of the peculiar velocity field around dark matter haloes in numerical simulations. We examine different properties of the infall of material onto haloes and its relation to central halo shapes and the shape of the large scale surrounding regions (LSSR). We find that the amplitude of the infall velocity field along the halo shape minor axis is larger than that along the major axis. This is consistent for general triaxial haloes, and for both prolate and oblate systems. We also report a strong anisotropy of the velocity field along the principal axes of the LSSR. The infall velocity field around dark matter haloes reaches a maximum value along the direction of the minor axis of the LSSR, whereas along the direction of its major axis, it exhibits the smallest velocities. We also analyse the dependence of the matter velocity field on the local environment. The amplitude of the infall velocity at high local density regions is larger than at low local density regions. The velocity field tends to be more laminar along the direction towards the minor axis of the LSSR, where the mean ratio between flow velocity and velocity dispersion is of order unity and nearly constant up to scales of 15 Mpc/h. We also detect anisotropies in the outflowing component of the velocity field, showing a maximum amplitude along the surrounding LSSR major axis.Comment: 12 pages, 9 figures, accepted for publication in Monthly Notices of the Royal Astronomical Societ

El Análisis cualitativo de datos con ATLAS.ti

Este artículo presenta las características, el procedimiento y la utilidad práctica del análisis de datos cualitativos en el proceso de investigación. Se trata de una tarea enormemente compleja para «dar sentido» a datos muy ricos y densos de significados en los estudios de carácter cualitativo. El trabajo describe cómo aplicar una herramienta informática, el ATLAS.ti, a este procedimiento analítico para su mayor sistematicidad, así como la mejor explotación y optimización de los resultados obtenidos. Se opta por un enfoque metodológico y con valor orientativo sobre el desarrollo autónomo de las tareas comunes del análisis de datos, como son la codificación y la categorización, la construcción de redes semánticas para la generación teórica, y la obtención de resultados parciales para plasmar en los informes de investigación