Now showing items 1-16 of 16

    • A closer look at lightning reveals needle-like structures 

      Williams, Earle R.; Montañá Puig, Juan (Macmillan Publishers, 2019-04-17)
      Article
      Open Access
      Structural features have been identified on positively charged lightning channels that are not present on negatively charged ones. The discovery could explain why these two types of channel have different behaviours.
    • A propagative model for simulations of electric fields produced by downward leaders 

      Hermoso Costa, Juan Ramón; Montañá Puig, Juan; March Nomen, Víctor; Van der Velde, Oscar Arnoud; Solà de las Fuentes, Glòria; Romero Durán, David; Hermoso Alameda, Blas; Pineda Rüegg, Nicolau (2012-07-13)
      Article
      Open Access
      Comparisons of simulated downward negative leaders with experimental measurements are presented in this paper. In order to simplify, the leaders are considered to progress vertically and charge distributions and leader ...
    • Aircraft Charging and its Influence on Triggered Lightning 

      Pavan, C.; Fontanes Molina, Pol; Urbani, Michele; Nguyen, Ngoc-Cuong; Martínez Sánchez, Manuel; Peraire Guitart, Jaume; Guerra García, Carmen (2020-01-16)
      Article
      Open Access
      This paper reports on a laboratory experiment to study the effect of vehicle net charge on theinception of a positive leader from an aircraft exposed to high atmospheric electric fields. The experimentmodels the first stage ...
    • Dielectric charge measurements in capacitive microelectromechanical switches 

      Molinero Giles, David; Comulada Simpson, Ricard; Castañer Muñoz, Luis María (American Institute of Physics, 2006-09-06)
      Article
      Restricted access - publisher's policy
      Measurements of transient currents from the discharge of microelectromechanical capacitive switches after charging the dielectric with an ion gun are reported. It is shown that both the charge sign and the charge amount ...
    • Estudi de descàrregues elèctriques atmosfèriques sobre aerogeneradors 

      Pinós Basseda, Pau (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2013-06)
      Master thesis
      Open Access
    • Estudio de descargas atmosféricas en redes aéreas de distribución 

      Sanz López-Menchero, Germán (Universitat Politècnica de Catalunya, 2015-05-05)
      Bachelor thesis
      Restricted access - confidentiality agreement
    • Estudio de descargas eléctricas atmosféricas sobre aerogeneradores. Parte II 

      Salvador, Darío (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2013)
      Master thesis
      Open Access
      La norma IEC 61400-24:2010 Aerogeneradores - Parte 24: Protección contra el rayo establece una metodología base para la estimación de descargas atmosféricas sobre aerogeneradores individuales. Pero no establece de forma ...
    • Experimental study of visual corona under aeronautic pressure conditions using low-cost imaging sensors 

      Riba Ruiz, Jordi-Roger; Gómez Pau, Álvaro; Moreno Eguilaz, Juan Manuel (Multidisciplinary Digital Publishing Institute (MDPI), 2020-01-11)
      Article
      Open Access
      Visual corona tests have been broadly applied for identifying the critical corona points of diverse high-voltage devices, although other approaches based on partial discharge or radio interference voltage measurements are ...
    • High-speed observations of transient luminous events and lightning (The 2008/2009 Ebro Valley campaign) 

      Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Soula, Serge; Romero Durán, David; Pineda Rüegg, Nicolau; Solà de las Fuentes, Glòria; March Nomen, Víctor (2010)
      Conference lecture
      Restricted access - author's decision
    • Influència de les descàrregues atmosfèriques a les Smart Grids 

      Brunet Pladevall, Mònica (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2012-01)
      Master thesis
      Open Access
      Les descàrregues atmosfèriques, són un fenomen complex i han calgut molts anys d’estudiar-lo per arribar a modelitzar-lo. S’ha observat que el llamp té un efecte molt important sobre les línies elèctriques, especialment ...
    • Obtención de la deformada de un arco sometido a cargas estáticas mediante el tratamiento de imagen DIC 

      Sanchez Perez, Marc (Universitat Politècnica de Catalunya, 2021-11-01)
      Bachelor thesis
      Restricted access - author's decision
      A lo largo del tiempo se han utilizado infinidad de herramientas para el cálculo de estructuras, ya sea para el análisis de reacciones de las estructuras al recibir ciertos agentes externos o para el cálculo de la evolución ...
    • Sigma-delta effects and charge locking in capacitive MEMS under dielectric charge control 

      Giounanlis, Panagiotis; Gorreta Mariné, Sergio; Domínguez Pumar, Manuel; Pons Nin, Joan; Feely, Orla; Blokhina, Elena (2016-05)
      Article
      Open Access
      This work investigates, analytically and experimentally, the effects induced by the use of a first-order sigma-delta (S¿) feedback loop as a control method of dielectric charging for capacitive microelectromechanical systems ...
    • Simplification and cost reduction of visual corona tests 

      Riba Ruiz, Jordi-Roger; Abomailek Rubio, Basel Carlos; Casals Torrens, Pau; Capelli, Francesca (2018-02-27)
      Article
      Open Access
    • Simulación de la formación de plasma en el mecanizado por electroerosión 

      Villagomez Galindo, Miguel; González Rojas, Hernan Alberto (Academia Journals, 2017)
      Conference report
      Open Access
      El proceso de mecanizado por electroerosión es una técnica de manufactura no convencional caracterizada por descargas eléctricas controladas que liberan tal cantidad de energía que es capaz de transformar en plasma el ...
    • The start of lightning: evidence of bidirectional lightning initiation 

      Montañá Puig, Juan; Van der Velde, Oscar Arnoud; Williams, Earle R. (Macmillan Publishers, 2015-10-18)
      Article
      Open Access
      Lightning flashes are known to initiate in regions of strong electric fields inside thunderstorms, between layers of positively and negatively charged precipitation particles. For that reason, lightning inception is ...
    • X-rays and microwave RF power from high voltage laboratory sparks 

      Montañá Puig, Juan; Fabró Tàpia, Ferran; March Nomen, Víctor; Van der Velde, Oscar Arnoud; Solà de las Fuentes, Glòria; Romero Durán, David; Argemí Ribera, Oriol (2015-07-16)
      Article
      Open Access
      Lightning flashes involve high energy processes that still are not well understood. In the laboratory, high voltage pulses are used to produce long sparks in open air allowing the production of energetic radiation. In this ...