Search results for "PACTOR"
showing 3 items of 33 documents
Reclaimed asphalt test specimen preparation assisted by image analysis
2015
This paper presents a laboratory investigation aimed at establishing a protocol for the production of homogeneous asphalt mixtures test specimens, incorporating reclaimed asphalt by using a gyratory compactor with coring and trimming works. Stone mastic asphalt specimens were compacted at the previously identified target densities with the final aim of obtaining specimens with a fixed and homogeneous air void distribution. A microstructural study was conducted to characterize the homogeneity in the air void distribution using X-ray computed tomography (CT) combined with image analysis techniques. The study concluded that the gyratory compactor is suitable for producing homogeneous test spec…
Analysis of the multipactor effect in microwave waveguides and transmission lines
2017
El trabajo desarrollado en la presente tesis doctoral tiene por objeto el estudio del efecto multipactor en guías de microondas. La descarga de multipactor es un fenómeno que aparece en componentes que operan en condiciones de alto vacío, y en presencia de campos electromagnéticos de gran intensidad en el rango de la radiofrecuencia (RF) y las microondas. El efecto multipactor aparece en un amplio rango de dispositivos como son los componentes pasivos de los satélites de telecomunicaciones espaciales, los aceleradores de partículas, y los amplificadores tipo klystron. Este fenómeno se produce debido a la presencia de electrones libres en el interior del dispositivo que son acelerados por el…
Multipactor radiation analysis within a waveguide region based on a frequency-domain representation of the dynamics of charged particles
2009
[EN] A technique for the accurate computation of the electromagnetic fields radiated by a charged particle moving within a parallel-plate waveguide is presented. Based on a transformation of the time-varying current density of the particle into a time-harmonic current density, this technique allows the evaluation of the radiated electromagnetic fields both in the frequency and time domains, as well as in the near- and far-field regions. For this purpose, several accelerated versions of the parallel-plate Green's function in the frequency domain have been considered. The theory has been successfully applied to the multipactor discharge occurring within a two metal-plates region. The proposed…