Elements traça en esfalerites i galenes del dipòsit de Cierco (Pb-Zn), Alta Ribagorça, Pirineu Central

El diposit consisteix en dos filons E-W, tallats per un altre N-S. El rebliment filonia és zonat amb esfalerita- galena-calcita als nivells profunds i galena-baritina als superiors. Els elements traca en esfalerites i galenes, plenament separades, han estat analitzats mitjancant fluoresckncia de raigs X. Els resultats mostren que l'esfalerita concentra la majoria d'elements traca, preferentment Fe, Co, Cd, Sn, Sb, Ga, Cu, Ge i Ag, amb una bona correlació entre els sis primers. La galena concentra únicament Sb, Ag i As, amb bona correlació entre els dos primers. Els continguts en elements traca estan homogkniament distribuits en tot el diposit

Com estudien els alumnes de secundària?

Una de les activitats habituals dels alumnes d'educació secundaria obligatòria és la que genèricament anomenem "estudi" que, quasi sempre, és un requisit indispensable per superar l'avaluació d'una matèria o un curs. Una recerca realitzada a la UAB i a la Universitat Ramon Llull ha volgut conèixer quins són els procediments d'estudi que els alumnes emprenen més habitualment i si en fan d'aquests un ús estratègic. D'altra banda, ha volgut conèixer com influencia aquest coneixement estratègic els resultats obtinguts en diferents tasques d'estudi.Una de las actividades habituales de los alumnos de educación secundaria obligatoria es la que genéricamente llamamos "estudio" que, casi siempre, es un requisito indispensable para superar la evaluación de una materia o un curso. Una investigación realizada en la UAB y la Universidad Ramon Llull ha querido conocer cuáles son los procedimientos de estudio que los alumnos emprenden más habitualmente y si hacen de estos un uso estratégico. Por otro lado, ha querido conocer cómo influye ese conocimiento estratégico los resultados obtenidos en diferentes tareas de estudio

Alpine reactivation of variscan folds and faults in the Iberian Chain: Examples of the Sierra de la Demanda and the Serrania de Cuenca

[Abstract] The structure of the Variscan basement of the Iberian Chain conditioned the geometry and orientation ofstructures formed during the Alpine compression. In the Sierra de la Demanda, located in the north-western part of the Iberian Chain, the E-W Variscan folds re-activated during the Tertiary compression, bringing about the folding of the mesozoic rocks uncomformably lying on them. In sorne sites this folds broke, forming high-angle thrusts. In the Boniches anticline (Serranía de Cuenca), Tertiary folding was conditioned by the existence of NW-SE basement faults, that moved under transpression. Variscan folding directions did not influence here the Tertiary deformational geometry

The mutual assessment system in teamwork: The value of the individual grade

Teaching-learning based on cooperative learning is grounded on a methodology that is currently one of the most widely used within formal education classrooms. Recently, special attention has begun to be paid to a fundamentally relevant aspect of the assessment of the learning of university students within their group performance: their individual grades obtained from teamwork. In addition to describing the individual grading system that is used to assess individual contributions, this study analyses the perceptions of 99 university students regarding the benefits that the system has for students’ learning process. A system of evaluation based on self-assessment, co-assessment and peer-assessment was implemented in a Spanish university. The results collected using a specially designed questionnaire led to the conclusion that improvements were achieved in the teaching-learning process, in manifesting positive attitudes and in improving students’ ability to learn to learn. In conclusion, students feel that they are granted greater control over their final grade and, as a result, perceive that their involvement in the task increases and their capacity for self-criticism develops

Contextualizing gender issues and inclusive education: an analysis of the perceptions of primary education teachers

This study explores the experiences and perceptions of primary education teachers regarding the struggle for gender equality in schools located in an area in northern Spain. In addition, it analyses the measures carried out in classrooms and schools to achieve this objective that are influenced by social and cultural factors, and does so within a scenario consisting of an inclusive school that advocates equality as one of its fundamental ethical principles. The study is included in the paradigm of qualitative research, and eight teachers from three public schools were interviewed. The teachers expressed their broad dissatisfaction with the generally limited involvement of the schools and the educational community in promoting gender equality, which is influenced by different social and cultural dynamics. Lines of action are proposed that motivate teachers to take responsibility for their teaching practice in order to guarantee gender equality in a context of cultural diversity

U-Pb zircon age of Ordovician magmatism in the Albera Massif (Eastern Pyrenees)

New geochronological data from the Albera Massif confirm the presence of an Early - Mid Ordovician igneous event (472 - 465Ma) recorded in the pre-Variscan rocks of the Pyrenees. This event resulted in the emplacement of a large granitic body in the lower part of the pre-Upper Ordovician metasedimentary succession and in the intrusion of a series of metric sized dykes in the middle and upper parts of it. The two types of igneous rocks were gneissified during subsequent Variscan deformation. The geochronological data confirm the occurrence of the gneiss as having derived from an Ordovician intrusive sheet, as in other Pyrenean massifs. The dykes are considered to be the subvolcanic equivalent of the intrusive sheet. The data also provide insight into the age of the metasedimentary series of the massif and enable us to correlate the dated rocks with other gneissic and subvolcanic bodies of the Variscan massifs of the Pyrenees and Iberia

U-Pb zircon age of Ordovician magmatism in the Albera Massif (Eastern Pyrenees)

New geochronological data from the Albera Massif confirm the presence of an Early – Mid Ordovician igneous event (472 - 465Ma) recorded in the pre-Variscan rocks of the Pyrenees. This event resulted in the emplacement of a large granitic body in the lower part of the pre-Upper Ordovician metasedimentary succession and in the intrusion of a series of metric sized dykes in the middle and upper parts of it. The two types of igneous rocks were gneissified during subsequent Variscan deformation. The geochronological data confirm the occurrence of the gneiss as having derived from an Ordovician intrusive sheet, as in other Pyrenean massifs. The dykes are considered to be the subvolcanic equivalent of the intrusive sheet. The data also provide insight into the age of the metasedimentary series of the massif and enable us to correlate the dated rocks with other gneissic and subvolcanic bodies of the Variscan massifs of the Pyrenees and Iberia

Links between ease of use, perceived usefulness and attitudes towards technology in older people in university: A structural equation modelling approach

Technological resources have the potential to improve the quality of life in a context in which social pressure for the use of these tools is increasing. In this sense, the adoption of technological resources by the elderly is a highly complex issue because numerous and varied factors are involved. Precisely for this reason, this study aims to analyze the effects that exist between a series of dimensions related to the perception of older people regarding the ease of use, the perceived usefulness of technological tools, attitudes towards technology and their intention to use them in everyday life. To do this, 415 adults (M = 66.27 years) enrolled in a program at the University of Experience in the Spanish context completed an online questionnaire. The application of a Structural Equations Model for data analysis highlights that the perceived ease of use of the technology has a positive effect on the perceived usefulness of these resources. Similarly, an indirect effect of the perceived usefulness of technology on the intention to use these resources is observed through the manifestation of positive attitudes towards the use of digital tools

Author Correction: LKB1 loss links serine metabolism to DNA methylation and tumorigenesis

Erratum for: LKB1 loss links serine metabolism to DNA methylation and tumorigenesis. [Nature. 2016