Institution
Technical University of Madrid
Education•Madrid, Spain•
About: Technical University of Madrid is a education organization based out in Madrid, Spain. It is known for research contribution in the topics: Population & Ontology (information science). The organization has 16613 authors who have published 34759 publications receiving 634043 citations. The organization is also known as: UPM & Polytechnical University of Madrid.
Topics: Population, Ontology (information science), Finite element method, European union, Solar cell
Papers published on a yearly basis
Papers
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King Juan Carlos University1, University of Vermont2, Pablo de Olavide University3, Technical University of Madrid4, Northern Arizona University5, University of La Serena6, Instituto Potosino de Investigación Científica y Tecnológica7, Universidad Simón Rodríguez8, Ben-Gurion University of the Negev9, State University of Feira de Santana10, Universidad Técnica Particular de Loja11, University of Sfax12, University of New South Wales13, Central University of Venezuela14, National University of San Juan15, University of the Bío Bío16, Virginia Tech College of Natural Resources and Environment17, Ohio State University18, National Agrarian University19, National University of La Pampa20, University of New England (Australia)21, Office of Environment and Heritage22, Spanish National Research Council23, Northeast Normal University24, Agricultural Research Organization, Volcani Center25
TL;DR: A global empirical study relating plant species richness and abiotic factors to multifunctionality in drylands, which collectively cover 41% of Earth’s land surface and support over 38% of the human population, suggests that the preservation of plant biodiversity is crucial to buffer negative effects of climate change and desertification in dryland.
Abstract: Experiments suggest that biodiversity enhances the ability of ecosystems to maintain multiple functions, such as carbon storage, productivity, and the buildup of nutrient pools (multifunctionality). However, the relationship between biodiversity and multifunctionality has never been assessed globally in natural ecosystems. We report here on a global empirical study relating plant species richness and abiotic factors to multifunctionality in drylands, which collectively cover 41% of Earth’s land surface and support over 38% of the human population. Multifunctionality was positively and significantly related to species richness. The best-fitting models accounted for over 55% of the variation in multifunctionality and always included species richness as a predictor variable. Our results suggest that the preservation of plant biodiversity is crucial to buffer negative effects of climate change and desertification in drylands.
941 citations
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TL;DR: An impulse-response characterization for the propagation path is presented, including models for small-scale fading, and it is shown that when two-way communication ports can be defined for a mobile system, it is possible to use reciprocity to focus the energy along the direction of an intended user without any explicit knowledge of the electromagnetic environment in which the system is operating.
Abstract: In order to estimate the signal parameters accurately for mobile systems, it is necessary to estimate a system's propagation characteristics through a medium. Propagation analysis provides a good initial estimate of the signal characteristics. The ability to accurately predict radio-propagation behavior for wireless personal communication systems, such as cellular mobile radio, is becoming crucial to system design. Since site measurements are costly, propagation models have been developed as a suitable, low-cost, and convenient alternative. Channel modeling is required to predict path, loss and to characterize the impulse response of the propagating channel. The path loss is associated with the design of base stations, as this tells us how much a transmitter needs to radiate to service a given region. Channel characterization, on the other hand, deals with the fidelity of the received signals, and has to do with the nature of the waveform received at a receiver. The objective here is to design a suitable receiver that will receive the transmitted signal, distorted due to the multipath and dispersion effects of the channel, and that will decode the transmitted signal. An understanding of the various propagation models can actually address both problems. This paper begins with a review of the information available on the various propagation models for both indoor and outdoor environments. The existing models can be classified into two major classes: statistical models and site-specific models. The main characteristics of the radio channel - such as path loss, fading, and time-delay spread - are discussed. Currently, a third alternative, which includes many new numerical methods, is being introduced to propagation prediction. The advantages and disadvantages of some of these methods are summarized. In addition, an impulse-response characterization for the propagation path is also presented, including models for small-scale fading, Finally, it is shown that when two-way communication ports can be defined for a mobile system, it is possible to use reciprocity to focus the energy along the direction of an intended user without any explicit knowledge of the electromagnetic environment in which the system is operating, or knowledge of the spatial locations of the transmitter and the receiver.
898 citations
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TL;DR: It is proposed that reiterated enzymatic cycles, controlling the generation of toxic molecules and their detoxification, enable the recruitment of glucosinolates in defense responses.
Abstract: Selection pressure exerted by insects and microorganisms shapes the diversity of plant secondary metabolites. We identified a metabolic pathway for glucosinolates, known insect deterrents, that differs from the pathway activated by chewing insects. This pathway is active in living plant cells, may contribute to glucosinolate turnover, and has been recruited for broad-spectrum antifungal defense responses. The Arabidopsis CYP81F2 gene encodes a P450 monooxygenase that is essential for the pathogen-induced accumulation of 4-methoxyindol-3-ylmethylglucosinolate, which in turn is activated by the atypical PEN2 myrosinase (a type of beta-thioglucoside glucohydrolase) for antifungal defense. We propose that reiterated enzymatic cycles, controlling the generation of toxic molecules and their detoxification, enable the recruitment of glucosinolates in defense responses.
876 citations
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TL;DR: An introduction proposes a modular scheme of the training and test phases of a speaker verification system, and the most commonly speech parameterization used in speaker verification, namely, cepstral analysis, is detailed.
Abstract: This paper presents an overview of a state-of-the-art text-independent speaker verification system. First, an introduction proposes a modular scheme of the training and test phases of a speaker verification system. Then, the most commonly speech parameterization used in speaker verification, namely, cepstral analysis, is detailed. Gaussian mixture modeling, which is the speaker modeling technique used in most systems, is then explained. A few speaker modeling alternatives, namely, neural networks and support vector machines, are mentioned. Normalization of scores is then explained, as this is a very important step to deal with real-world data. The evaluation of a speaker verification system is then detailed, and the detection error trade-off (DET) curve is explained. Several extensions of speaker verification are then enumerated, including speaker tracking and segmentation by speakers. Then, some applications of speaker verification are proposed, including on-site applications, remote applications, applications relative to structuring audio information, and games. Issues concerning the forensic area are then recalled, as we believe it is very important to inform people about the actual performance and limitations of speaker verification systems. This paper concludes by giving a few research trends in speaker verification for the next couple of years.
874 citations
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Carlos III Health Institute1, Technical University of Madrid2, Ghent University3, University of Zaragoza4, University of Copenhagen5, University of Tromsø6, Harokopio University7, Robert Koch Institute8, Medical Research Council9, Medical University of Graz10, VU University Amsterdam11, University of Iceland12, National Institutes of Health13, University of Helsinki14, Loyola University Chicago15, University College Cork16
TL;DR: Vitamin D deficiency is evident throughout the European population at prevalence rates that are concerning and that require action from a public health perspective, and what direction these strategies take will depend on European policy.
830 citations
Authors
Showing all 16935 results
Name | H-index | Papers | Citations |
---|---|---|---|
Alejandro Alonso | 124 | 821 | 69091 |
Nicola Maffulli | 115 | 1570 | 59548 |
Marco Dorigo | 105 | 657 | 91418 |
Hermann Ney | 98 | 997 | 49231 |
Paul Schulze-Lefert | 90 | 222 | 30412 |
Tomás Torres | 88 | 625 | 28223 |
Mark Wilkinson | 87 | 1014 | 38539 |
Alan Needleman | 86 | 373 | 39180 |
Mark R. Wiesner | 84 | 326 | 26324 |
Jan M. Rabaey | 81 | 525 | 36523 |
Javier DeFelipe | 76 | 327 | 20464 |
Michael K. Udvardi | 76 | 237 | 21665 |
Tomas Palacios | 75 | 412 | 24254 |
Manuel Vázquez | 74 | 1177 | 28189 |
Yolanda Sanz | 74 | 616 | 17177 |