Search results for "Roca"
showing 10 items of 1893 documents
Provincia de Lérida
Publicat pel bàndol republicà. - Llegenda. - Relleu representat per corbes de nivell Edició especial de juliol de 1938 del mapa editat pel Ministerio de Obras Públicas el 1935
Cien años de los ferrocarriles españoles : 1848-1948
Textos, Manuel Prados López Calendari publicat en commemoració del primer centenari del ferrocarril a Espanya. Conté una recopilació de gravats i dibuixos relacionats amb la història ferroviària
Ferrocarril de Calatayud-Teruel-Segorbe, Sagunto o Grao de Valencia : su verdadera importancia en el orden económico y mercantil
1895
Электрокалорический эффект в сегнетоэлектриках со структурой перовскита
1986
Comparación de la efectividad de dos sistemas de monitorización electrocardiográfica ambulatoria, en la detección de recurrencias en pacientes con fi…
2020
Antecedentes: La fibrilación auricular es una de las arritmias cardíacas que más comprometen y afectan a la calidad de vida de las personas que la sufren, incrementando considerablemente su morbimortalidad. La crioablación de las venas pulmonares es una opción terapéutica de elección en pacientes con fibrilación auricular paroxística. El holter electrocardiográfico es una herramienta muy útil en el control de recurrencias, pues posibilita un registro continuo de la actividad eléctrica del corazón. Objetivos: El análisis de los datos pretende comparar la efectividad de ambos métodos e identificar el perfil de pacientes que se beneficia de cada uno de ellos. Metodología: Esta tesis es un estu…
Wavelet variance differences in atrial fibrillation during anaesthetic effect
2008
Effect of anaesthetic agents in restoration rhythm procedures during atrial fibrillation (AF) has not been fully investigated. We evaluated the effects of a widely used anaesthetic agent (propofol) in the fibrillation patterns. Intra-atrial recordings belong to 18 patients diagnosed with AF were analyzed ldquobeforerdquo (baseline) and ldquoduringrdquo anaesthetic infusion. The goal of this study is to characterize the variation in atrial properties along the atria in both states. The wavelet variance decomposes the variance of a time series on a scale by scale basis and hence has considerable appeal when physical phenomena are analyzed in terms of variations operating over a range of diffe…
2013
Background: Detecting paroxysmal atrial fibrillation (PAF) in patients with cerebral ischemia is challenging. Frequent premature atrial complexes (PAC/h) and the longest supraventricular run on 24-h-Holter (SV-run24 h), summarised as excessive supraventricular ectopic activity (ESVEA), may help selecting patients for extended ECG-monitoring, especially in combination with echocardiographic marker LAVI/a’ (left atrial volume index/late diastolic tissue Doppler velocity). Methods: Retrospective analysis from the prospective monocentric observational trial Find-AF (ISRCTN-46104198). Patients
Local electrical characterisation of human atrial fibrillation
2002
The rate of success of radio-frequency catheter ablation in the treatment of atrial fibrillation may be significantly improved by evaluating the local electrical properties of the atrial tissue. The aim of this study is the development of an automatic procedure for the characterisation of the local electrical activity during atrial fibrillation and the comparison of its performance with the manual analysis. The adopted procedures were the semi-automatic measurement of the local fibrillation intervals (A-A intervals) and the manual electrogram classification following the criteria suggested by Wells (1978) or Konings (1997). Two methods have been used: Principal Component Analysis and Cluste…
The performance of the ATHENA X-ray Integral Field Unit
2018
The X-ray Integral Field Unit (X-IFU) is a next generation microcalorimeter planned for launch onboard the Athena observatory. Operating a matrix of 3840 superconducting Transition Edge Sensors at 90 mK, it will provide unprecedented spectro-imaging capabilities (2.5 eV resolution, for a field of view of 5') in the soft X-ray band (0.2 up to 12 keV), enabling breakthrough science. The definition of the instrument evolved along the phase A study and we present here an overview of its predicted performances and their modeling, illustrating how the design of the X-IFU meets its top-level scientific requirements. This article notably covers the energy resolution, count-rate capability, quantum …
Foetal ECG recovery using dynamic neural networks
2002
Non-invasive electrocardiography has proven to be a very interesting method for obtaining information about the foetus state and thus to assure its well-being during pregnancy. One of the main applications in this field is foetal electrocardiogram (ECG) recovery by means of automatic methods. Evident problems found in the literature are the limited number of available registers, the lack of performance indicators, and the limited use of non-linear adaptive methods. In order to circumvent these problems, we first introduce the generation of synthetic registers and discuss the influence of different kinds of noise to the modelling. Second, a method which is based on numerical (correlation coe…