Dinámica de la descomposición unimolecular de derivados halogenados del etano : estudio por trayectorias clásicas

Tesis - Universidad Complutense de Madrid, 1982.Depto. de Química FísicaFac. de Ciencias QuímicasTRUEProQuestpu

A local spectral condition for strong compactness with some applications to bilateral weighted shifts

An algebra of bounded linear operators on a Banach space is said to be strongly compact if its unit ball is precompact in the strong operator topology, and a bounded linear operator on a Banach space is said to be strongly compact if the algebra with identity generated by the operator is strongly compact. Our interest in this notion stems from the work of Lomonosov on the existence of invariant subspaces. We provide a local spectral condition that is sufficient for a bounded linear operator on a Banach space to be strongly compact. This condition is then applied to describe a large class of strongly compact, injective bilateral weighted shifts on Hilbert spaces, extending earlier work of Fernández-Valles and the first author. Further applications are also derived, for instance, a strongly compact, invertible bilateral weighted shift is constructed in such a way that its inverse fails to be a strongly compact operator.Ministerio de Ciencia e InnovaciónJunta de Andalucí

Detailed study of the direct numerical observation of the Kramers turnover in the LiNC⇌LiCN isomerization rate

The following article appeared in Journal of Chemical Physics 137.20 (2012): 204301 and may be found at http://scitation.aip.org/content/aip/journal/jcp/137/20/10.1063/1.4766257According to Kramers, rates of molecular process are expected to follow a rise and fall from low friction (at little to no interaction with the environment) to high friction (at typical liquid densities and above). This so-called Kramers turnover was recently observed and delineated in the case of the LiNC⇌LiCN isomerization reaction in the presence of an argon bath [P. García-Müller, R. Hernandez, R. M. Benito, and F. Borondo, Phys. Rev. Lett. 101, 178302 (2008)]. The rates were obtained using direct molecular dynamics of an all-atom representation and the Langevin dynamics of a projected representation. We now provide further evidence that the forward and backward rates are indeed exhibiting the turnover. The rates are also seen to agree remarkably well with the Pollak-Grabert-Hänggi rate formulas in regimes satisfying the theory underlying assumptions. At higher temperatures, when the theory is expected to fail, the solvated LiCN isomerization continues to exhibit activated dynamics following the turnoverThis work has been supported by the Spanish MINECO under projects MTM2009-14621 and ICMAT Severo Ochoa SEV-2011-0087. It also has been partially supported by the U.S. National Science Foundation under Grant No. CHE-1112067. Travel between partners was partially supported through the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme FP7/2007-2013/ under REA Grant Agreement No. 29497

Improvement of Contact Tracing with Citizen's Distributed Risk Maps

[EN] The rapid spread of COVID-19 has demonstrated the need for accurate information to contain its diffusion. Technological solutions are a complement that can help citizens to be informed about the risk in their environment. Although measures such as contact traceability have been successful in some countries, their use raises society's resistance. This paper proposes a variation of the consensus processes in directed networks to create a risk map of a determined area. The process shares information with trusted contacts: people we would notify in the case of being infected. When the process converges, each participant would have obtained the risk map for the selected zone. The results are compared with the pilot project's impact testing of the Spanish contact tracing app (RadarCOVID). The paper also depicts the results combining both strategies: contact tracing to detect potential infections and risk maps to avoid movements into conflictive areas. Although some works affirm that contact tracing apps need 60% of users to control the propagation, our results indicate that a 40% could be enough. On the other hand, the elaboration of risk maps could work with only 20% of active installations, but the effect is to delay the propagation instead of reducing the contagion. With both active strategies, this methodology is able to significantly reduce infected people with fewer participants.This research was supported by TAILOR, a project funded by EU Horizon 2020 research and innovation programme under GA No 952215, and by the Spanish Ministry of Science, Innovation and Universities (MICIU) under Contract No. PGC2018-093854-B-I00b and RTI2018-095390-B-C32.Rebollo Pedruelo, M.; Benito, RM.; Losada, JC.; Galeano, J. (2021). Improvement of Contact Tracing with Citizen's Distributed Risk Maps. Entropy. 23(5):1-21. https://doi.org/10.3390/e23050638S12123

Nuevas localidades alicantinas de Carduncellus dianius Webb

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Repercusiones en los alumnos de primer curso de la implantación del Espacio Europeo

The Universidad Europea de Madrid pretends to converge into the European Higher Education Area being the pioneer oft he Spanish University framework. As such, has chosen to carry out the Pilot and Converge Plans that are transforming its educational means, involving all its educational community. Those Plans cover the first course students belonging to the different University school and faculties. The study intends to observe and analyze the process success and its weakness, concluding the positive implications they have reached so long in the academy results, as in its fitness to the different items involved in the starting out of the processes, and the valuation of the obtained knowledge

Determination of persistent and mobile organic contaminants (PMOCs) in water by mixed-mode liquid chromatography-tandem mass spectrometry

The presence of persistent and mobile organic contaminants (PMOC) in aquatic environments has become a matter of concern due to their ability of breaking through natural and anthropogenic barriers, even reaching drinking water. The presence of many of these compounds in surface and drinking water has been reported in screening studies, but there is still a lack of analytical methods capable of quantifying them. Herein, we propose a method combining mixed-mode-solid-phase extraction (MM-SPE) as preconcentration technique and mixed-mode liquid chromatography (MMLC) coupled to tandem mass spectrometry as a determination technique for the quantitative determination of 23 target PMOCs in surface and drinking water samples. When compared to reversed-phase liquid chromatography, the MMLC protocol has proven to be superior in both retentive capabilities and peak shape for ionic compounds, while performing also well for neutrals. The overall method performance was satisfactory with limits of quantification under 50 ng L–1 for most of analytes in both surface and drinking water. The relative standard deviation was lower than 20%, and the average recovery was 78 and 80% in surface and drinking water, respectively. The method was applied to 15 water samples collected in Spain, where 17 out of the 23 target PMOCs were quantified in at least one sample. Among them, 6 chemicals (e.g., benzyltrimethylammonium) are reported and/or quantified here for the first timeThis work has been funded by the Spanish MINECO/AEI (JPIW2013-117, CTM2014-56628-C3-2-R, and CTM2017-84763-C3-2-R) in the frame of the collaborative international consortium (WATERJPI2013 – PROMOTE) of the Water Challenges for a Changing World Joint Programming Initiative (Water JPI) Pilot Call, the Galician Council of Culture, Education and Universities (ED431C2017/36) and FEDER/EDRF fundingS

Ingesta alimentaria y su relación con el estado nutricional antropométrico en los estudiantes de 4to, 5to y 6to grado de educación primaria en la I.E. César A. Vallejo 1195 de Chosica, 2015

El estado nutricional está relacionado con la ingesta alimentaria por aportar nutrientes esenciales para la formación de los tejidos, y desarrollo del cerebro, durante las primeras etapas de la vida, que es la base para el resto de la vida humana. El presente trabajo de investigación titulado: “ingesta alimentaria y su relación con el estado nutricional antropométrico en los estudiantes de 4to, 5to y 6to grado de educación primaria en la I.E. César A. Vallejo 1195 Chosica- 2015”, tiene como objetivo determinar la influencia de la ingesta alimentaria en el estado nutricional antropométrico de los estudiantes de dicha Institución. La metodología que utilizó, es de nivel aplicativo, y de tipo descriptivo correlacional (investigación no experimental – transversal correlacional): Es un estudio antropométrico, con una muestra de 66 estudiantes de nivel primaria. Para determinar la ingesta alimentaria, se aplicaron los instrumentos frecuencia de consumo y 24 horas. El estado nutricional antropométrico de los estudiantes evaluó la talla para la edad y peso para la edad. Analizando mediante correlación de Chi cuadrado cualitativa se determinó que existe relación significativa

Las ciencias de la atmósfera en los libros de texto de la enseñanza obligatoria española

Ponencia presentada en: XXIX Jornadas Científicas de la AME y el VII Encuentro Hispano Luso de Meteorología celebrado en Pamplona, del 24 al 26 de abril de 2006

Ingesta alimentaria y su relación con el estado nutricional antropométrico en los estudiantes de 4to, 5to y 6to grado de educación primaria en la I.E. César A. Vallejo 1195 de Chosica, 2015

El estado nutricional está relacionado con la ingesta alimentaria por aportar nutrientes esenciales para la formación de los tejidos, y desarrollo del cerebro, durante las primeras etapas de la vida, que es la base para el resto de la vida humana. El presente trabajo de investigación titulado: “ingesta alimentaria y su relación con el estado nutricional antropométrico en los estudiantes de 4to, 5to y 6to grado de educación primaria en la I.E. César A. Vallejo 1195 Chosica- 2015”, tiene como objetivo determinar la influencia de la ingesta alimentaria en el estado nutricional antropométrico de los estudiantes de dicha Institución. La metodología que utilizó, es de nivel aplicativo, y de tipo descriptivo correlacional (investigación no experimental – transversal correlacional): Es un estudio antropométrico, con una muestra de 66 estudiantes de nivel primaria. Para determinar la ingesta alimentaria, se aplicaron los instrumentos frecuencia de consumo y 24 horas. El estado nutricional antropométrico de los estudiantes evaluó la talla para la edad y peso para la edad. Analizando mediante correlación de Chi cuadrado cualitativa se determinó que existe relación significativa