Politechnical University of Madrid

Madrid, Spain

Politechnical University of Madrid

Madrid, Spain
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Llorente P.,Politechnical University of Madrid
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Year: 2017

Underground surveying of cellars, caves, and architectural spaces, is quite different from surveying on the surface. Researchers must deal with various challenges derived of the lack of natural light, low temperature, and humidity, but also with inaccessibility. But the essential problem in underground surveying is that of orientating the underground surveys to the surface surveys. For this purpose our methodology integrates different geomatic techniques, as the use of a scanner laser in order to obtain a 3D model, as well as classic topography, and GPS to locate accurately the control points according to the official reference frame of the Spanish Geodetic Network. The developed methodology is described and applied to the case study of the cellars of the Gallery of Convalescents (Galería de Convalecientes) in the Royal Monastery of San Lorenzo de El Escorial. These cellars compose an outstanding series of interrelated singular complex spaces. Their study is particularly relevant because of the quality of the stonework, the geometry of the vaults and lunettes, and the stereotomy. The fact that these spaces were neither surveyed nor studied before, must be stressed. And our work will bring into light an important part of the 16th century Spanish architectural heritage. Finally, the INSPIRE Directive becomes an opportunity to integrate cultural heritage datasets into an interoperable framework, and to share and diffuse them as geographic information.

Gonzalez-Nicieza C.,University of Oviedo | Ordiales-Martinez V.,TSK | Lain-Huerta R.,Politechnical University of Madrid | Lain-Huerta C.,Politechnical University of Madrid | Alvarez-Fernandez M.I.,University of Oviedo
Engineering Failure Analysis | Year: 2017

Within the complexity of the design and execution of a solar power plant project, one of the main challenges falls on rainwater management, since there is the need to collect, conduct and store it for its use in the water-vapour cycle process. Therefore, the primary piping for rainwater transportation from the solar power plant is regarded as an essential installation for the operation of the plant. Within this framework, the appearance of pathologies in its conduction just a few months after the plant start-up is considered to be a critical problem, as it can endanger the electrical production of the facility. This problem has taken place at the solar power plant of “La Asturiana”, in Southern of Spain, with a solar field of 2 Mm2 in size and a gross generation capacity of 50 MW. The need to understand the reason for the pathologies, in order to prevent their reappearance, justifies a detailed analysis of the adopted design, as well as its execution. The research is completed with novel techniques for in-situ tests, which enable us to obtain rigorous data to be used in computer models with the aim of reproducing, in a controlled way, the execution conditions in order to establish the causes of the failure. © 2017 Elsevier Ltd

Germania R.M.,Technical University of Loja | Cueva Carrion S.P.,Technical University of Loja | Tovar Caro E.,Politechnical University of Madrid
2011 IEEE Global Engineering Education Conference, EDUCON 2011 | Year: 2011

The present article shows an investigation made about Standards and Specifications of e-Learning contents, their later selection and analysis of the ones having reusability and interoperability features in Open Educational Resources which are the base of the application purpose in resource development on the instructional design stages and evaluation in already developed resources. © 2011 IEEE.

Quispe L.E.,Technical University of Loja | Galan L.M.,Politechnical University of Madrid
WEBIST 2012 - Proceedings of the 8th International Conference on Web Information Systems and Technologies | Year: 2012

Providing QoS in the context of Ad Hoc networks includes a very wide field of application from the perspective of every level of the architecture in the network. Saying It in another way, It is possible to speak about QoS when a network is capable of guaranteeing a trustworthy communication in both extremes, between any couple of the network nodes by means of an efficient Management and administration of the resources that allows a suitable differentiation of services in agreement with the characteristics and demands of every single application. The principal objective of this article is the analysis of the quality parameters of service that protocols of routering reagents such as AODV and DSR give in the Ad Hoc mobile Networks; all of this is supported by the simulator ns-2. Here were going to analyze the behavior of some other parameters like effective channel, loss of packages and latency in the protocols of routering. Were going to show you which protocol presents better characteristics of Quality of Service (QoS) in the MANET networks.

Quispe L.E.,Technical University of Loja | Tandazo R.T.,Technical University of Loja | Galan L.M.,Politechnical University of Madrid
WEBIST 2012 - Proceedings of the 8th International Conference on Web Information Systems and Technologies | Year: 2012

A mobile ad hoc network MANET is a collection of wireless mobile nodes that can dynamically configure a network without a fixed infrastructure or centralized administration. This makes it ideal for emergency and rescue scenarios where information sharing is essential and should occur as soon as possible. This article discusses which of the routing strategies for mobile ad hoc networks: proactive, reactive and hierarchical, have a better performance in such scenarios. Using a real urban area being set for the emergency and rescue scenario, we calculate the density of nodes and the mobility model needed for validation. The NS2 simulator has been used in our study. We also show that the hierarchical routing strategies are beffer suited for this type of scenarios.

Quispe L.E.,Technical University of Loja | Galan L.M.,Politechnical University of Madrid
Proceedings - 5th International Conference on Computational Intelligence, Communication Systems, and Networks, CICSyN 2013 | Year: 2013

Providing QoS in the context of Ad Hoc networks includes a very wide field of application from the perspective of every level of the architecture in the network.In order for simulation studies to be useful, it is very important that the simulation results match as closely as possible with the test bed results. In this Paper, we study the throughput performance(parameter QoS) in Mobile Ad Hoc Networks (MANETs) and compares emulated test bed results with simulation results from NS2 (Network Simulator). The performance of the Mobile Ad Hoc Networks is very sensitive to the number of users and the offered load. When the number of users/offered load is high then the collisions increase resulting in larger wastage of the medium and lowering overall throughput. The aim of this research is to compare the throughput of Mobile Ad Hoc Networks using three different scenarios: 97, 100 and 120 users (nodes) using simulator NS2. By analyzing the graphs in MANETs, it is concluded When the number of users o nodes is increased beyond the certain limit, throughput decreases. © 2013 IEEE.

Martin F.,Charles III University of Madrid | Moreno L.,Charles III University of Madrid | Blanco D.,Charles III University of Madrid | Munoz M.L.,Politechnical University of Madrid
Robotics and Autonomous Systems | Year: 2014

The global localization problem for mobile robots is addressed in this paper. In this field, the most common approaches solve this problem based on the minimization of a quadratic loss function or the maximization of a probability distribution. The distances obtained from the perceptive sensors are used together with the predicted ones (from the estimates in the known map) to define a cost function or a probability to optimize. In our previous work, we developed an optimization-based global localization module that used evolutionary computation concepts. In particular, the algorithm engine was the Differential Evolution method. In this work, this algorithm has been modified including the minimization of the Kullback-Leibler divergence between true observations and estimates. This divergence is used to calculate the cost function of the localization module. The algorithm has been tested in different situations and the most important improvement is the ability to cope with different types of occlusions. © 2013 Elsevier B.V. All rights reserved.

Mallo J.,Politechnical University of Madrid | Veiga S.,Politechnical University of Madrid | Lopez de Subijana C.,Politechnical University of Madrid | Navarro E.,Politechnical University of Madrid
Journal of Science and Medicine in Sport | Year: 2010

The aim of this study was to describe the activity profile of top-class female soccer referees during competition and to relate it to the position of the ball. Ten matches from the Fédération Internationale de Football Association (FIFA) under-20 female World Championships held in Russia in 2006 were filmed and the kinematical parameters of the female referees (n = 10) and the ball were determined using a two-dimensional photogrammetric video system based on direct linear transformation (DLT) algorithms. Total distance covered during a match was 10 km, of which 1.3 km represented high-intensity activities (>13 km/h). The referees' highest mobility was achieved in the initial 15 min of the match, covering greater distance and performing more intense exercise (P < 0.01) than in the final 15-min of the game. Mean distance from the referee to the ball was 19.5 ± 2.4 m, with no significant differences between 15 min match periods. The results of this study show that: (1) the physical demands placed on top-class female referees are much like those experienced during male moderate-standard refereeing and (2) the referees were able to maintain the distance from the ball throughout the match. © 2008 Sports Medicine Australia.

Dapena E.,Politechnical University of Madrid | Alaejos P.,Politechnical University of Madrid | Lobet A.,Politechnical University of Madrid | Perez D.,Politechnical University of Madrid
Journal of Materials in Civil Engineering | Year: 2011

When recycled aggregate is used for concrete manufacture, in many cases these aggregates are accompanied by a recycled sand content. This research focuses on concretes prepared with recycled sand content. First, the research examined the effects of recycled sand content on the characteristics of mortar-density and compressive and flexural strength-by using recycled sand contents of 0, 5, 10, 15, 20, and 50%. Subsequently, the effect on the characteristics of recycled concretes made with a water/cement ratio of 0.50, when part of the recycled aggregate was replaced with recycled sand, was studied. The results obtained on mortars indicate that the use of up to 20% recycled sand caused a drop in the compressive and flexural strength. In concretes, the use of up to 100% recycled aggregate has no appreciable effect on compressive strength but does lower the modulus of elasticity, E, as the recycled aggregate content increases. If the recycled aggregate used in the manufacture of concretes contains up to 10% recycled sand, this sand has no appreciable effect on the compressive strength of the concrete, nor on its modulus of elasticity E. © 2011 American Society of Civil Engineers.

Melida H.,University of León | Melida H.,Politechnical University of Madrid | Largo-Gosens A.,University of León | Novo-Uzal E.,University of Murcia | And 7 more authors.
Journal of Integrative Plant Biology | Year: 2015

Maize (Zea mays L.) suspension-cultured cells with up to 70% less cellulose were obtained by stepwise habituation to dichlobenil (DCB), a cellulose biosynthesis inhibitor. Cellulose deficiency was accompanied by marked changes in cell wall matrix polysaccharides and phenolics as revealed by Fourier transform infrared (FTIR) spectroscopy. Cell wall compositional analysis indicated that the cellulose-deficient cell walls showed an enhancement of highly branched and cross-linked arabinoxylans, as well as an increased content in ferulic acid, diferulates and p-coumaric acid, and the presence of a polymer that stained positive for phloroglucinol. In accordance with this, cellulose-deficient cell walls showed a fivefold increase in Klason-type lignin. Thioacidolysis/GC-MS analysis of cellulose-deficient cell walls indicated the presence of a lignin-like polymer with a Syringyl/Guaiacyl ratio of 1.45, which differed from the sensu stricto stress-related lignin that arose in response to short-term DCB-treatments. Gene expression analysis of these cells indicated an overexpression of genes specific for the biosynthesis of monolignol units of lignin. A study of stress signaling pathways revealed an overexpression of some of the jasmonate signaling pathway genes, which might trigger ectopic lignification in response to cell wall integrity disruptions. In summary, the structural plasticity of primary cell walls is proven, since a lignification process is possible in response to cellulose impoverishment. © 2015 Institute of Botany, Chinese Academy of Sciences.

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