OALib Journal期刊

ISSN: 2333-9721




2020 ( 277 )

2019 ( 651 )

2018 ( 707 )

2017 ( 705 )


匹配條件: “M; Serrano” ,找到相關結果約403696條。
Present needs in theachers’ initial training
Rosario Mérida Serrano
Revista Electronica Interuniversitaria de Formación del Profesorado , 2009,
Abstract: This article aims at outlining a reflection on some of the limitations that currently affect teachers’ initial training. To do so, we relied on studies and research, as well as in our professional experience and focused on the analysis of the following issues: the distance between teachers’ professional demands and the training they receive at university, the nature of the knowledge that teachers use in their practical teaching, the role played by values in initial training and the profile that teachers’ trainers should have.
Rich-club vs rich-multipolarization phenomena in weighted networks
M. Angeles Serrano
Physics , 2008, DOI: 10.1103/PhysRevE.78.026101
Abstract: Large scale hierarchies characterize complex networks in different domains. Elements at their top, usually the most central or influential, may show multipolarization or tend to club forming tightly interconnected communities. The rich-club phenomenon quantified this tendency based on unweighted network representations. Here, we define this metric for weighted networks and discuss the appropriate normalization which preserves nodes' strengths and discounts structural strength-strength correlations if present. We find that in some real networks the results given by the weighted rich-club coefficient can be in sharp contrast to the ones in the unweighted approach. We also discuss that the scanning of the weighted subgraphs formed by the high-strength hubs is able to unveil features contrary to the average: the formation of local alliances in rich-multipolarized environments, or a lack of cohesion even in the presence of rich-club ordering. Beyond structure, this analysis matters for understanding correctly functionalities and dynamical processes relying on hub interconnectedness.
Phase transition in the globalization of trade
M. Angeles Serrano
Quantitative Finance , 2006, DOI: 10.1088/1742-5468/2007/01/L01002
Abstract: Globalization processes interweave economic structures at a worldwide scale, trade playing a central role as one of the elemental channels of interaction among countries. Despite the significance of such phenomena, measuring economic globalization still remains an open problem. More quantitative treatments could improve the understanding of globalization at the same time that help a formal basis for comparative economic history. In this letter, we investigate the time evolution of the statistical properties of bilateral trade imbalances between countries in the trade system. We measure their cumulative probability distribution at different moments in time to discover a sudden transition circa 1960 from a regime where the distribution was always represented by a steady characteristic function to a new state where the distribution dilates as time goes on. This suggests that the rule that was governing the statistical behavior of bilateral trade imbalances until the 60's abruptly changed to a new form persistent in the last decades. In the new regime, the figures for the different years collapse into a universal master curve when rescaled by the corresponding global gross domestic product value. This coupling points to an increased interdependence of world economies and its onset corresponds in time with the starting of the last globalization wave.
Generalized percolation in random directed networks
M. Boguna,M. A. Serrano
Physics , 2005, DOI: 10.1103/PhysRevE.72.016106
Abstract: We develop a general theory for percolation in directed random networks with arbitrary two point correlations and bidirectional edges, that is, edges pointing in both directions simultaneously. These two ingredients alter the previously known scenario and open new views and perspectives on percolation phenomena. Equations for the percolation threshold and the sizes of the giant components are derived in the most general case. We also present simulation results for a particular example of uncorrelated network with bidirectional edges confirming the theoretical predictions.
Weighted Configuration Model
M. A. Serrano,M. Boguna
Physics , 2005, DOI: 10.1063/1.1985381
Abstract: The configuration model is one of the most successful models for generating uncorrelated random networks. We analyze its behavior when the expected degree sequence follows a power law with exponent smaller than two. In this situation, the resulting network can be viewed as a weighted network with non trivial correlations between strength and degree. Our results are tested against large scale numerical simulations, finding excellent agreement.
El profesor-tutor del prácticum de magisterio como profesional usuario de medios
M. C. Martínez Serrano
Pixel-Bit , 2006,
Abstract: En este artículo presentamos un somero resumen de los resultados más interesantes obtenidos en una tesis doctoral denominada Uso de los medios en el Prácticum de Magisterio . Estos versan sobre la utilización que hacen de los medios y recursos los profesores-tutores durante el periodo en el que el estudiante de magisterio esta realizando las prácticas bajo su asesoría y supervisión.
Caracterización mecánica de un acero ferrítico/martensítico de activación reducida de producción espa ola
Rodríguez, D.,Serrano, M.
Revista de Metalurgia , 2012,
Abstract: This paper shows the first results concerning the characterization of two heats of a reduced activation 9 Cr ferritic/martensitic steel (RAFM) made in Spain, called AF1B and AF2A. The results of this characterization are compared with their European counterparts, EUROFER97-2, which was chosen as reference material. All activities described were performed in the Structural Materials Unit of CIEMAT, within the national project TECNO-FUS CONSOLIDER INGENIO.The two Spanish heats have the same production process and heat treatment. Both heats have a similar tensile behaviour similar to EUROFER97-2, but on the other hand impact properties are lower. The microstructure of AF1B reveals large biphasic inclusions that affecting its mechanical properties, especially the impact properties. AF2A casting was free of these inclusions. En este documento se reflejan los primeros resultados referentes a la caracterización de dos coladas de un acero 9 Cr ferrítico/martensítico de activación reducida (RAFM) producido en Espa a, denominadas AF1B y AF2A. Los resultados obtenidos en dicha caracterización se compararán con su homólogo europeo, el EUROFER97-2, el cual se eligió como material de referencia. Todas las actividades detalladas se realizaron en la Unidad de Materiales Estructurales del CIEMAT, dentro del proyecto TECNO-FUS CONSOLIDER INGENIO. Ambas coladas, producidas en una planta piloto de la Fundación ITMA, presentan el mismo proceso de producción y tratamiento térmico final. Asimismo presentan un comportamiento a tracción similar al del EUROFER97-2. Por el contrario, las propiedades a impacto son menores a las del homólogo europeo. En la microestructura de la colada AF1B se han detectado inclusiones bifásicas de gran tama o que afectan a sus propiedades mecánicas, sobre todo a las de impacto. Estas inclusiones no se detectaron en la AF2A.
Hipertensión arterial: La perspectiva del médico de familia Arterial hypertension: A family physician’s perspective
M. Serrano-Martínez
Anales del Sistema Sanitario de Navarra , 2008,
Steven M. Nesbit,Monika Serrano
Journal of Sports Science and Medicine , 2005,
Abstract: A work and power (energy) analysis of the golf swing is presented as a method for evaluating the mechanics of the golf swing. Two computer models were used to estimate the energy production, transfers, and conversions within the body and the golf club by employing standard methods of mechanics to calculate work of forces and torques, kinetic energies, strain energies, and power during the golf swing. A detailed model of the golf club determined the energy transfers and conversions within the club during the downswing. A full-body computer model of the golfer determined the internal work produced at the body joints during the downswing. Four diverse amateur subjects were analyzed and compared using these two models. The energy approach yielded new information on swing mechanics, determined the force and torque components that accelerated the club, illustrated which segments of the body produced work, determined the timing of internal work generation, measured swing efficiencies, calculated shaft energy storage and release, and proved that forces and range of motion were equally important in developing club head velocity. A more comprehensive description of the downswing emerged from information derived from an energy based analysis
Journal of Venomous Animals and Toxins , 1999, DOI: 10.1590/s0104-79301999000200009

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