950 research outputs found
Electrostatic System for fine control of mirror orientation in interferometric GW Antennas
No full textIn this Letter we analyze a multistrip electrostatic device developing forces of the order of 1 mN on a dielectric mirror. Such a device has been developed for controlling the orientation of suspended mirrors in long baseline interferometers used for detecting gravitational waves. The dependence of the force on the distance mirror-multistrip has been measured and the fitting with the computed value has been satisfactory in the range 0.5–3 mm
State of the art of the optimisation of the selection and use of renewable energies for the agricultural environment
No full text[EN] A combination of different energy generation sources, together
with the possibility of installing batteries or other forms of
energy storage systems, can enable the adaptation of the
generated electricity to the needs of the farming sector. From
optimal irrigation schedules for crops, to taking advantage of
pruning waste to generate electricity at times when other sources
are not able to generate it, this fitting can allow the farmers to
focus solely on the wellbeing of the plants, without worrying
about energy prices. On the other hand, it also provides the
possibility of maximising energy production on days where the
crop health is already ensured.
In summary, this study is the first steps to work on what is
missing to create hybrid energy systems that can adapt to the
needs of the crops and their ecosystem. These hybrid energy
systems applied on farms can improve the wellbeing of isolated
areas, such as islands, industrial sites, or villages, helping the
owners provide benefits for themselves and their communities.This work has been carried out within the framework of the research project "Re-vitalising Energy Transition in
Touristic Islands -"LIFE21-CET-LOCAL-GENERA" (Reference: 101077073) of the LIFE-2021-CET Framework Programme funded by the European Executive Agency for Climate, Infrastructure and Environment.Leon-Vinet, A.;Peñalvo-López, E.;Valencia-Salazar, I.;Cárcel-Carrasco, J. (2023). State of the art of the optimisation of the selection and use of renewable energies for the agricultural environment. Renewable Energy and Power Quality Journal. 21:399-404. https://doi.org/10.24084/repqj21.335S3994042
Elasto optical antennas
No full textIt is shown that elasto optical properties of some transparent media make possible to couple elastic with optical resonators. Large single crystals with high quality factors lead to narrow band resonant antennas, whereas optical fibers lead to wideband antennas. The sensitivities are evaluated
Recycling interferrometric antennas for periodic gravitational waves
No full textExperimental devices using either delay lines or Fabry-Pérot cavities in detectors of gravitational waves have been proposed and developed for a few years. In order to make clear the comparison between these elements when arranged in a synchronous recycling setup suitable for periodic waves, general formulae giving the signal amplitudes are proposed.Depuis quelques années, des dispositifs expérimentaux utilisant soit des lignes à retard soit des cavités de Perot-Fabry comme détecteurs d'ondes de gravitation ont été proposées puis développées. On présente ici des formules générales permettant de comparer ces éléments lorsqu'ils sont associés dans un montage à recyclage synchrone, adapté aux ondes gravitationnelles périodiques
Bibliografía
No full textRESEÑA 1 de : Beceiro Pita, Isabel; Córdoba de la Llave, Ricardo. Parentesco, poder y mentalidad. La nobleza castellana (siglos XII-XV). Madrid : CSIC, 1990. RESEÑA 2 de : Coll-Vinet, Roberto; Bernal Cruz, Francisco J. Curso de documentación. Madrid : Edit. Dossat, 1990. RESEÑA 3 de : Corral García, Esteban. Ordenanzas de los concejos castellanos : formación, contenidos y manifestaciones: siglos XIII-XVIII. Burgos : S.E., 1988. RESEÑA 4 de : García Oliva, María Dolores. Organización económica y social del concejo de Cáceres en la baja Edad Media. Cáceres : Institución Cultural el Brócense, 1990. RESEÑA 5 de : Magdalena Nom de Deu, JOsé Ramón. Libro de viajes de Benjamín de Tudela. Barcelona : Biblioteca Nueva Sefarad, Ríopiedras Ediciones, 1989. RESEÑA 6 de : TOrres Fontes, Juan. Repartimiento de Orihuela. Murcia : Ed. Academia Alfonso X el Sabio / Patronato Ángel García Rogel, 1988
Measurement of power effects caused by the deterioration of the neutral conductor in three-phase distribution networks
No full text[EN] The expressions of the powers that measure the effects of the energies manifested by the deterioration of the neutral conductor in low-voltage distribution networks are developed in this paper with the name of neutral-displacement powers. The expressions of these powers have been obtained by applying the Principle of Energy Conservation to the entire three-phase system and the use of Buchholz's apparent source and load powers. Contrary to the traditional apparent powers of the neutral conductor, these new powers are not affected by the neutral currents and, therefore, their expressions can be applied to analyze the effects of the neutral conductor even though this conductor has been accidentally broken or disconnected. In the application example, based on the three-phase distribution network of a real industrial estate, it has been verified that the neutral-displacement powers reach a maximum value when the neutral conductor has been broken, while the traditional apparent powers of the neutral conductor are worth zero under those conditions. This result confirms that the neutral-displacement powers are more adequate quantities than the traditional ones to measure the impact that the deterioration and disconnection of the neutral conductor can cause in three-phase distribution networks.The work described in this paper has been sponsored and developed under the H2020 SMEmPower Projects (grant number 847132) of the European Commission and GV/2021/149, granted by the Generalitat Valenciana. Likewise, we would like to thank VINALESA DISTRIBUCIÓN DE ENERGÍA, S.L.U., for having made their distribution networks available to us to carry out the practical experiences.Peñalvo-López, E.; Leon-Vinet, A.; León-Martínez, V.; Montañana-Romeu, J.; Valencia-Salazar, I. (2022). Measurement of power effects caused by the deterioration of the neutral conductor in three-phase distribution networks. Electric Power Systems Research. 215 B. https://doi.org/10.1016/j.epsr.2022.109014S215
Éléments de syntaxe quantificationnelle relations syntaxiques et logiques dans les langues naturelles
No full textLe phénomène de la quantification est présenté à travers une analyse qui fusionne les aspects sémantiques et syntaxiques. Les éléments quantifiés qui sont formellement des objets d'ordre supérieur affichent un comportement assez particulier et inattendu d'un point de vue de la grammaire traditionnelle, compte tenu de leur rôle dans l'espace syntagmatique. À des anomalies logico-sémantiques s'ajoutent des particularités des plus variées au niveau syntaxique. Le problème posé par les ambiguïtés de portée y figure au premier plan. Les phénomènes s'avèrent déterminés par des contraintes structurelles. Le niveau syntagmatique de LF (Forme logique) fournit la plate-forme conceptuelle pour une analyse unifiée de cas divers. Les objets quantifiés sont généralement présumés être sujets à l'opération transformationnelle de la montée de quantifieurs. Selon la conception minimaliste, cette dernière est déclenchée par des exigences morphologiques. Dans une analyse initiale, nous profitons des interactions entre la portée des quantifieurs et certaines conditions structurelles comme la condition des structures coordonnées, les ellipses, les effets de référence croisée faible et les constructions d'extraction pour vérifier la validité de notre approche."--Résumé abrégé par UMI
Noise induced by laser power fluctuations via absorption asymmetry in gravitational-wave interferometric detectors
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