186,206 research outputs found
Determinar el axil de una barra mediante el Método de los trabajos virtuales
No full textAprender a aplicar el Teorema de los trabajos virtuales para determinar UNA reacción o fuerza interna concreta en estructuras formadas por varios elementos articulados.https://polimedia.upv.es/visor/?id=1e4e5c60-1c2e-11ef-ad81-af0a2f4eb04eLozano Mínguez, E.; Museros Romero, P. (2024). Determinar el axil de una barra mediante el Método de los trabajos virtuales. https://riunet.upv.es/handle/10251/205262DE
High-speed trains derived from Annex E / EN 1991-2
No full textThis new version of dataset "doi: 10.17632/hdr6dd5xv2.1" is intended to fix an error detected in the definition of the "conventional trains" contained in such previous dataset. The error arising from a bug in a computer code, was detected in Feb 2023. Therefore, while in the present version the conventional trains have been updated, the "articulated" and "regular" ones remain unchanged.The dataset contains 3759 realizations of axle load sequences corresponding to potential high-speed trains (conventional, articulated, regular) which comply with the prescriptions in Annex E / Eurocode EN 1991-2, Actions on structures - Part 2: Traffic loads on bridges. Therefore, the dataset describes potential sources of dynamic excitation for bridges, falling within the range of application of EN 1991-2 for high-speed lines.Annex E in EN 1991-2 establishes the conditions that a sequence of train loads ought to fulfil to respect the limits of validity of load model HSLM-A. Consequently, this dataset represents a (dense) ensemble of trains defined under the range of validity currently associated to HLSM-A. Such conditions are described in the attached “Characteristics of the high-speed trains derived from Annex E (EN1991-2).pdf”. Four types of traction are considered: (1) distributed traction (this one not used for regular trains); (2) power cars with wheelbases equal to HSLM-A; (3) power cars with wheelbases equal to RENFE S103 (a Siemens unit); (4) power cars with wheelbases equal to RENFE S112 (Talgo Avril).One condition stipulated in Annex E / EN 1991-2 is not respected in this dataset: the requirement that wheelbase ratios D/dBA and (dBS-dBA)/dBA should not be close to integers. This deliberate omission is assumed following publications where it is demonstrated that the vibratory effects produced by these integer wheelbase ratios are not significantly larger than the effects from other ratios far from being integer. Indeed, a number of current high-speed vehicles feature integer or near-integer wheelbase ratios, as reported in [3] below (references follow): [1] P. Museros et al. Dynamic behaviour of bridges under critical articulated trains: Signature and bogie factor applied to the review of some regulations included in EN 1991-2. PI Mech Eng F-J Rai, 2021; 235(5):655-675; [2] P. Museros et al. Dynamic effect of trains with articulated coaches and Jacobs bogies with integer wheelbase ratios. XI Int Conf on Struc Dyn EURODYN 2020; 2646-2657; [3] P. Museros et al. Dynamic behaviour of bridges under critical conventional and regular trains: review of some regulations included in EN 1991-2. PI Mech Eng F-J Rai, 2022 (submitted).When the HSLM-A model was devised, its creators envisaged that certain types of potential vehicles ought to be considered in designing railway bridges for future high-speed lines. Such types were summarised in Annex E from EN 1991-2. This dataset comprehensively covers the trains loads that can be defined from such regulations.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV
Diagramas de esfuerzos en una viga isostática: nivel intermedio (cargas antisimétricas)
No full textEn este vídeo se ilustra a través de un ejemplo cómo calcular y representar los diagramas de esfuerzos en una viga isostática sometida a un estado de cargas antisimétrico.https://polimedia.upv.es/visor/?id=015ad620-a71a-11ea-accc-7be568d3f28dEspinós Capilla, A.; Lapuebla Ferri, A.; Museros Romero, P.; Jimenez Mocholi, AJ. (2020). Diagramas de esfuerzos en una viga isostática: nivel intermedio (cargas antisimétricas). https://riunet.upv.es/handle/10251/145761DE
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Competencia Transversal CT-12. Planificación y gestión del tiempo
No full textCon este vídeo se pretende formar al alumnado en la competencia transversal ¿planificación y gestión del tiempo¿, designada como CT-12 en el contexto educativo de la Universitat Politècnica de València. A lo largo de la visualización se proporcionan una serie de pautas y consejos para gestionar el tiempo disponible y así mejorar el rendimiento académico, en especial la calificación de dicha competencia.https://polimedia.upv.es/visor/?id=2f9eac30-aeab-11ea-b37d-8ba0fafea3a5Lapuebla Ferri, A.; Espinós Capilla, A.; Museros Romero, P. (2021). Competencia Transversal CT-12. Planificación y gestión del tiempo. Universitat Politècnica de València. https://riunet.upv.es/handle/10251/167679DE
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
RETROFIT OF EXISTING RAILWAY BRIDGES OF SHOR TO MEDIUM SPANS FOR HIGH-SPEED TRAFFIC USING VISCOELASTIC DAMPERS
No full textElsevier Moliner Cabedo, E.; Museros Romero, P.; Martínez Rodrigo, MDLD. (2012). Retrofit of existing railway bridges of short to medium spans for high-speed traffic using viscoelastic dampers. Engineering Structures. 40:519-528. doi:10.1016Structures. 40:519-528. doi:10. /j.engstruct.2012 Abstract. This paper presents a study on the energy-absorbing capacities of viscoelastic dampers (VEDs) for reducing the resonant vibrations of simply supported high-speed railway bridges of short to medium span. The proposed solution is based on retrofitting the bridge with a set of discrete VEDs connected to the slab and to an auxiliary structure, placed underneath the bridge deck and resting on the abutments. In this investigation attention is focused on mitigating flexural vibrations; therefore, both the bridge and the auxiliary structure are modelled as simply supported beams with Bernoulli−Euler (B-E) behavior, whereas a discrete fractional derivative model simulates the behavior of the damping material. Firstly, a parametric study of this planar model is carried out, which has led to a dimensioning procedure of the dissipative system. The technical feasibility of this particular retrofit design is numerically evaluated by applying it to a numerical model of a simply supported railway bridge with inadmissible vertical accelerations. Numerical results show that the dynamic response of the structure can be significantly reduced in resonance with the proposed damping system.
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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