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Producción científica
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Tesis doctorales
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TFM, TFG y otros trabajos académicos
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Revistas científicas UNED
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Institucional

Estadísticas

16,840

Items totales

13,771

Items en acceso abierto

81.78 %

Porcentaje

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Envíos recientes

Miniatura
Publicación
Effect of the secondary suspension and intercar links on the performance of a high-speed train
(Elsevier, 2025-08-04) Bustos Caballero, Alejandro; Rubio Alonso, Higinio; Castejón Sisamón, Cristina; García Prada, Juan Carlos
Multibody simulations are a useful tool for studying railway dynamics in different conditions, as they eliminate the need for expensive tests using actual rolling stock. This paper presents a multibody model of an articulated high-speed train with shared bogies, comprising eight passenger cars and nine bogies, that is implemented in Universal Mechanism. The train's critical speed under nominal conditions is determined by the presence of limit cycles in the wheelsets' phase plane of lateral motion and by the standard deviation of their lateral displacement. A sensitivity study is then performed to examine the impact of secondary suspension stiffness and intercar link damping on lateral stability at speeds between 250 km/h and 450 km/h. The horizontal stiffness of the secondary suspension significantly affects the critical speed, making the central cars of the train more prone to oscillations. Conversely, the vertical stiffness of air springs and the damping of intercar dampers have a minimal effect on the train's critical speed. The proposed model is a first step in developing the digital twin of a high-speed train.
Miniatura
Publicación
Teaching Economics with Spanish Primary School Textbooks during the Franco Dictatorship and the Transition to Democracy (1962–1982)
(Berghahn Journals, 2017-03-01) Mahamud Angulo, Kira; Hernández Laina, M. Yovana
In this article we analyze knowledge about economics conveyed via pri- mary school textbooks published during the late Franco dictatorship and the years of transition to democracy in Spain. Starting from the premise that the process of political socialization and identity construction is based partly on economic fac- tors, we examine the evolution of the content of economics in textbooks during and after the technocratic phase of planning and development. We elucidate ways in which economic culture is transmitted in schools, identifying certain values, principles and patterns of sociopolitical thought that this culture upholds and projects.
Miniatura
Publicación
Civic education and visions of war and peace in the Spanish transition to democracy
(Taylor & Francis, 2016-03-15) Mahamud Angulo, Kira; Groves, tamar; Milito Barone, Cristina Cecilia; Hernández Laina, M. Yovana
This article explores visions of war and peace in the education system during the Spanish transition to democracy. During those years, the Spanish state was faced with the challenge of leaving its authoritarian political past behind and forging a democratic civic culture. As the concepts of war and peace are inextricably linked to those of state and citizenship, they are a useful tool with which to examine changes in civic education. A wide variety of educational sources has been explored, with particular attention to the emotional nature of the depiction of both war and peace. This study reveals two opposing styles. The official discourse demonstrated a factual treatment of war and a tendency to concentrate on international bodies and their actions, when it came to fomenting peace. The treatment of peace in the circles of teachers’ local initiatives was different. First, peace was defined not only as the absence of war but also in terms of social equality and solidarity. Second, there was a conscious effort to get the students involved in opposing war, reinforced by emotionally charged messages regarding its horrors.