562 research outputs found

    E-chapter of Analysis of Effective Instructional Sequences in Upper Primary Education (11–12 Years Old Students) to Enhance Content-Learning through the Integrated Use of Reading and Writing

    Get PDF
    Analysis of Effective Instructional Sequences in Upper Primary Education (11–12 Years Old Students) to Enhance Content-Learning through the Integrated Use of Reading and Writing2017-1

    Analysis of Effective Instructional Sequences in Upper Primary Education (11–12 Years Old Students) to Enhance Content- Learning through the Integrated Use of Reading and Writing

    Get PDF
    Analysis of Effective Instructional Sequences in Upper Primary Education (11–12 Years Old Students) to Enhance Content-Learning through the Integrated Use of Reading and Writing.2017-1

    Synthesis of Enantiopure Oxygen- and Nitrogen-Containing Heterocycles by Diastereoselective Ring-Closing Metathesis Reaction in Perhydro-1,3-benzoxazine Derivatives

    Get PDF
    Producción CientíficaDiastereoselective ring‐closing metathesis reactions on chiral trienic perhydro‐1,3‐benzoxazines derived from (−)‐8‐aminomenthol featuring two diastereotopic olefin chains is described. The diastereochemical outcome of the cyclization appeared to be dependent on the length and position of the olefin chains in perhydro‐1,3‐benzoxazine, the degree of substitution of the double bonds and the ruthenium catalyst used. After separation of the diastereomers, and removal of the chiral auxiliary, enantiopure oxygen‐ and nitrogen‐containing heterocycles were obtained.Ministerio de Economía, Industria y Competitividad (Project FEDER-CTQ2014-59870-P)Junta de Castilla y León (Ref. Project FEDER-VA115P17

    Creative Drama and Forum Theatre in initial teacher education: Fostering students’ empathy and awareness of professional conflicts

    Get PDF
    Two studies examined the impact of a programme that used Creative Drama and Forum Theatre on the social, emotional, and ethical skills of student teachers. The first study qualitatively analysed 49 teaching conflict situations devised by 280 students. The second analysed the programme's effect on 626 students? empathy and perception of their teaching-learning processes. The types of conflicts, contexts, and ethical dilemmas involved were categorised. Pedagogical tools and their effect on self-knowledge, perspectivetaking, and socio-moral sensitivity and reflection were favourably assessed. The emotional understanding component of empathy significantly improved. The results support a more comprehensive training of future teachers

    Error correcting codes from quasi-Hadamard matrices

    Get PDF
    Levenshtein described in [5] a method for constructing error correcting codes which meet the Plotkin bounds, provided suitable Ha- damard matrices exist. Uncertainty about the existence of Hadamard matrices on all orders multiple of 4 is a source of difficulties for the prac- tical application of this method. Here we extend the method to the case of quasi-Hadamard matrices. Since efficient algorithms for constructing quasi-Hadamard matrices are potentially available from the literature (e.g. [7]), good error correcting codes may be constructed in practise. We illustrate the method with some examples.Junta de Andalucía FQM–29

    In Vitro Culture of ‘Myrobalan’ (Prunus cerasifera Ehrh.) Embryos

    Get PDF
    The definitive version is available at: http://hortsci.ashspublications.org/In vitro embryo culturing has arisen as a powerful tool for embryo germination of low-viability seeds. This tool has been used to germinate seeds of early-maturing or hybrid Prunus species. ‘Myrobalan’ (Prunus cerasifera Ehrh.) is a widely used rootstock for plum and apricot cultivars and its interspecific hybrids have a clear potential for breeding purposes. However, early seed abortion is often a problem in interspecific crosses because no protocol has been established yet for ‘Myrobalan’ seeds. In this work, we developed a procedure for in vitro germination of embryos of different sizes. Various factors affecting embryo germination such as the culture media, the presence of cotyledons, the stratification temperature, and the embryo size were tested in three different ‘Myrobalan’ clones. The developed protocol includes the use of full embryos that were stratified at 4 °C and cultured in C2d culture medium. The germination rate was strongly affected by the embryo size and reached 90% germination with intermediate- to large-sized embryos (6.5 to 10 mm). However, smaller embryos could also be germinated, and up to 30% germination was achieved with 0.5- to 2-mm long embryos. The results obtained here provide a protocol for in vitro germination of ‘Myrobalan’ embryos that will likely be helpful in breeding programs.This work was partially supported by the INIA-FEDER project RF2008-00029-C02-01 and by the Grupo de Excelencia A-43 (Gobierno de Aragón).Peer reviewe

    Differences and similarities between oral and written competence in Spanish pre-university students. A correlation study.

    Get PDF
    The Foreign Language (FL) section of Spanish University Entrance Examination (EFL-PAU) has had few revisions over the last twenty years. The Spanish government has substituted the old EFL-PAU University Entrance Examination by a high stakes Baccalaureate Final Evaluation. However, further changes are expected in the coming years. Among the most important ones for the Foreign Language Section is a deep and necessary revision with the inclusion of new types of tasks. To try and inform the decisions made for the new Baccalaureate Final Evaluation, this article reports on the quantitative and qualitative analyses conducted thanks to a pilot oral test carried out with 772 recorded candidate performances. Three main goals were established for this research: 1) to find out the most important variables which characterize foreign language learning in secondary school in Spain; 2) to find out if there is any correlation between the oral competence of students at the end of their non-compulsory secondary education (as obtained from the pilot study) and the marks students obtain in the University Entrance Examination (which does not include the oral skill); and 3) to find out any aspects related to EFL teaching and learning which may potentially enhance oral performance. The results of this paper provide rich information on the students? foreign language learning context, the strong correlation between the written and oral competences and the need to pay attention to three variables which foster the development of oral foreign language in secondary school classroomsMinisterio de Ciencia e InnovaciĂł

    Differences and similarities between oral and written competence in Spanish pre-university students a correlational study

    Get PDF
    El artículo está disponible en la web de la revista: https://ojs.uc.cl/index.php/onom/article/view/31307/24291The Foreign Language (FL) section of Spanish University Entrance Examination (EFL-PAU) has had few revisions over the last twenty years. The Spanish government has substituted the old EFL-PAU University Entrance Examination by a high stakes Baccalaureate Final Evaluation. However, further changes are expected in the coming years. Among the most important ones for the Foreign Language Section is a deep and necessary revision with the inclusion of new types of tasks. To try and inform the decisions made for the new Baccalaureate Final Evalua-tion, this article reports on the quantitative and qualitative analyses conducted thanks to a pilot oral test carried out with 772 recorded candidate performances. Three main goals were established for this research: 1) to find out the most important variables which characterize foreign language learning in secondary school in Spain; 2) to find out if there is any correla-tion between the oral competence of students at the end of their non-compulsory secondary education (as obtained from the pilot study) and the marks students obtain in the University Entrance Examination (which does not include the oral skill); and 3) to find out any aspects related to EFL teaching and learning which may potentially enhance oral performance. The results of this paper provide rich information on the students’ foreign language learning con-text, the strong correlation between the written and oral competences and the need to pay attention to three variables which foster the development of oral foreign language in sec-ondary school classroomsMinistry of Economy and Competitiveness (MICINN) OPENPAU research project (FFI2011-22442

    Optimization of Countercurrent Supercritical Fluid Extraction of Minor Components from Olive Oil

    Get PDF
    A process based on the use of a semi-continuous countercurrent supercritical fluid extraction (CC-SFE) has been optimized to concentrate minor components, with functional properties, from olive oil. The optimization of the main variables involved in the supercritical extraction process (extraction pressure, temperature and sample flow rate) was performed using a surface response methodology (RSM). A central composite circumscribed design (CCCD) was employed to study the responses selected to describe the process, such as the extraction yield, the concentration of the different minor compounds (squalene, sterols and tocopherols) in the CO2-rich upper current stream, and the recovery of these compounds from the olive oil. Parameters of the model, for each response variable, were simultaneously estimated by Partial Least Squares (PLS) regression. The statistical analysis of the results allowed obtaining mathematical models able to predict the behavior of the different responses selected as a function of the main variables involved in the process. The optimum conditions obtained, that maximized all the responses as a whole, were: extraction pressure, 234 bar; extraction temperature, 35°C and sample flow rate, 82 mL/h, working with a solvent flow rate equal to 2000 mL/h (S/F equal to 28.4 kg CO2/kg oil). The optimum of the model was experimentally confirmed allowing around 90% recovery of squalene without significant changes on the nutritional and physicochemical properties of the oil

    Searching for partial Hadamard matrices

    Get PDF
    Three algorithms looking for pretty large partial Hadamard ma- trices are described. Here “large” means that hopefully about a third of a Hadamard matrix (which is the best asymptotic result known so far, [8]) is achieved. The first one performs some kind of local exhaustive search, and consequently is expensive from the time consuming point of view. The second one comes from the adaptation of the best genetic algorithm known so far searching for cliques in a graph, due to Singh and Gupta [21]. The last one consists in another heuristic search, which prioritizes the required processing time better than the final size of the partial Hadamard matrix to be obtained. In all cases, the key idea is characterizing the adjacency properties of vertices in a particular subgraph Gt of Ito’s Hadamard Graph (4t) [18], since cliques of order m in Gt can be seen as (m + 3) × 4t partial Hadamard matrices.Ministerio de Ciencia e Innovación MTM2008-06578Junta de Andalucía FQM-016Junta de Andalucía P07-FQM-0298
    • 

    corecore