Signal analysis and feature generation for pattern identification of partial discharges in high-voltage equipment

This paper proposes a method for the identification of different partial discharges (PDs) sources through the analysis of a collection of PD signals acquired with a PD measurement system. This method, robust and sensitive enough to cope with noisy data and external interferences, combines the characterization of each signal from the collection, with a clustering procedure, the CLARA algorithm. Several features are proposed for the characterization of the signals, being the wavelet variances, the frequency estimated with the Prony method, and the energy, the most relevant for the performance of the clustering procedure. The result of the unsupervised classification is a set of clusters each containing those signals which are more similar to each other than to those in other clusters. The analysis of the classification results permits both the identification of different PD sources and the discrimination between original PD signals, reflections, noise and external interferences. The methods and graphical tools detailed in this paper have been coded and published as a contributed package of the R environment under a GNU/GPL license.

Stopping of α particles from the core in corona plasmas

In the laser fusion reactor design, the protection of first wall and the final optics from high energy ions is the key issue. So, it is necessary to predict the precise energy spectra of ions.In the previous reactor designs, the ion energy spectra were provided by the classical ion transport codes. However, this poster shows that the α particle spectrum is significantly modified by the anomalous process in ablated plasmas.

Gas discharges for continental Spain: geochemical and isotopic features

In this work the results of a geochemical and isotopic survey of 37 gas discharges was carried out in continental Spain are presented and discussed. On the basis of the gas chemical composition, four different areas can be distinguished, as follows: 1) Selva-Emborda (SE) region; 2) Guadalentin Valley (GV); 3) Campo de Calatrava (CC) and 3) the inner part of Spain (IS). The SE, GV and CC areas are characterized by CO2-rich gases, while IS has N2 as main gas compound. The CO2-rich gases can be distinguished at their turn on the basis on the helium and carbon isotopic composition. The SE and CC areas have a strong mantle signature (up to 3 Ra). Nevertheless, the carbon isotopic composition of CC is within the mantle range and that of SE is slightly more negative (down to -8‰ PDB). The GV gases have a lower mantle signature (61 Ra) with respect to SE and CC and more negative carbon isotopes (6-10‰ PDB). It is worth to mention that the SE, GV and CC areas are related to the youngest volcanic activity in continental Spain, for example the Garrotxa Volcanic Field in Catalonia records the latest event dated at 10,000 years, and the isotopic features, particularly those of helium, are suggesting the presence of magmatic bodies still cooling at depth. The N2-rich gases, i.e. those from the IS area, has an atmospheric origin, as highlighted by the N2/Ar ratio that ranges between those of air and ASW (Air Saturated Water). The isotopic composition of carbon is distinctly negative (down to -21‰ PDB) and that of helium is typically crustal (0.02-0.08 Ra), confirming that these gas discharges are related to a relatively shallow source.

Ion charge number and flux saturation effects in the corona of a laser-irradiated pellet

The quasisteady structure of the corona of a laser-irradiated pellet is completely determined for arbitrary Z, (ion charge number} and re/ra (ratio of critical and ablation radii), and for heat-flux saturation factor/above approximately 0.04. The ion-to-electron temperature ratio at rc grows sensibly with Z,; all other quantities depend weakly and nonmonotonically on Z,. For rc /ra close to unity, and all Z, of interest (Z, < 47}, the flow is subsonic at rc. For a given laser power W, flux saturation may decrease (low/) or increase (high/) the ablation pressure Pa relative to the value obtained when saturation is not considered; in some cases a decrease in/with W fixed increases Pa. For intermediate^ ~0.1), Pa cc (W/r* )2/3 p\n\pc = critical density), independently of rc/ra; for/~0.6, Pa «s larger by a factor of about [rc/raf13. For rjra > 1.2 roughly, the mass ablation rate is C{Z,) [{m/kZ.f^Kr^Pl) l,\ independent of pc and/, and barely dependent on Z,(m, is ion mass; k, Boltzmann's constant; K, conductivity coefficient; and C, a tabulated function).

Corona poética dedicada a Miguel de Cervantes Saavedra

Leída en el Paraninfo de la Universidad Literaria el día 23 de abril de 1872

Corona ilustre del grauissimo, y real Conuento del Carmen de Valencia enrriquecida de muchas piedras preciosas de hijos suyos ...

Contiene además otros escritos de Fr. Juan Pinto de Victoria, Fr. Ambrosi Roca de la Serna, Fr. Josep Andreu

Historia de la provincia de la corona de Aragon de la sagrada orden de los ermitaños ... : parte primera, contiene las fundaciones de los conventos de religiosos ... del Reyno de Valencia ...

Sign.: [calderón]4, 2[calderón]4, A-Z4, 2A-2Z4, 3A-2Z4

Historia de la provincia de la corona de Aragon de la... orden de los Ermitaños de... San Agustin... : parte primera, contiene las fundaciones de los conventos de religiosos ... del Reyno de Valencia

Sign.: *4, 2[estrella]4, A-Z4, 2A-2Z4, 3A-3Z4, 4A-4V4, 4X-4Y2

Historia de la provincia de la corona de Aragon de la... orden de los Ermitaños de... San Agustin... : parte II, III, y IV, contienen las fundaciones de los conventos de religiosos ...

Sign.: []2, 2[calderón]4, A-Z4, 2A-2Z4, 3A-3Q4, 3R2

Pragmatica que su Magestad ha mandado promulgar reduciendo los reditos de los censos de la Corona de Aragón del cinco al tres por ciento, conforme a la que se publicó para los Reynos de Castilla, y Leon en veinte y tres de febrero de mil setecientos y cinco ...

Pragmática dada en Buen-Retiro, a nueve de julio de 1750

Tratado de la Nobleza de la Corona de Aragon : especialmente del Reyno de Valencia, comparada con la de Castilla, para ilustracion de la Real Cedula del Señor Don Luis I de 14 de Agosto de 1724

Contiene: Apendice y coleccion de los documentos y notas pertencientes al Tratado de la nobleza de la Corona de Aragon ..

[Fragmento de pergamino otorgado por el rey de la Corona de Aragon a la villa de Alzira]

Fecha del documento incompleta : "barchin juli-[]"

Declaracion de su alteza el serenissimo Infante Cardenal tocante a la guerra contra la Corona de Francia

El lugar de producción de Pedro Madrigal y su familia es Madrid