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  • Fully Noncontact Hybrid NDT for 3D Defect Reconstruction Using SAFT Algorithm and 2D Apodization Window 

    Mohamed Selim, Hossameldin; Trull Silvestre, José Francisco; Delgado Prieto, Miquel; Pico Vila, Rubén; Romeral Martínez, José Luis; Cojocaru, Crina (Multidisciplinary Digital Publishing Institute (MDPI), 2019-05-08)
    Article
    Open Access
    Nondestructive testing of metallic objects that may contain embedded defects of different sizes is an important application in many industrial branches for quality control. Most of these techniques allow defect detection ...

  • Advanced quiz development for students’ self-learning in power generation, transmission and distribution 

    Bogarra Rodríguez, Santiago; Corbalán Fuertes, Montserrat; Plaza, Inmaculada (SAGE PUBLICATIONS INC, 2019)
    Article
    Restricted access - publisher's policy
    Students’ learning can be improved by using online quizzes with a valuable feedback, especially in large groups, making it very interesting for engineering subjects which are based on mathematics. This paper presents the ...

  • 3D simulations of interdigitated back-contacted crystalline silicon solar cells on thin substrates 

    Jin, Chen; Martín García, Isidro; Ortega Villasclaras, Pablo Rafael; Calle Martín, Eric; Alcubilla González, Ramón (2018-06-01)
    Article
    Restricted access - publisher's policy
    Interdigitated back contact technology is a promising candidate to be applied to thin crystalline silicon solar cells because of its simpler one-side interconnection while allowing a more flexible front surface treatment. ...

  • Adaptive slope voltage control for distributed generation inverters with improved transient performance 

    Rey López, Juan Manuel; Castilla Fernández, Miguel; Miret Tomàs, Jaume; Camacho Santiago, Antonio; Guzmán Solà, Ramon (2019-04-09)
    Article
    Restricted access - publisher's policy
    Reactive power injection in distributed generation inverters is an useful ancillary service for grid supporting purposes. For grid-feeding converters, the slope control method is the most common voltage regulation strategy ...

  • Architectural optimization framework for earth-observing heterogeneous constellations : marine weather forecast case 

    Araguz López, Carles; Llaveria Godoy, David; Lancheros Sepulveda, Estefany Maria; Bou Balust, Elisenda; Camps Carmona, Adriano José; Alarcón Cot, Eduardo José; Tonetti, Stefania; Cornara, Stefania; Vicario, Gonzalo; Lluch i Cruz, Ignasi; Matevosyan, Hripsime; Golkar, Alessandro; Cote, Judith; Pierotti, Stéphane; Rodríguez, Pedro; Alvaro Sanchez, A.; Sochacki, Mateusz; Narkiewicz, Janusz (2019-01-25)
    Article
    Open Access
    Earth observation satellite programs are currently facing, for some applications, the need to deliver hourly revisit times, subkilometric spatial resolutions, and near-real-time data access times. These stringent requirements, ...

  • Reprogrammable graphene-based metasurface mirror with adaptive focal point for THz imaging 

    Hosseininejad, Seyed Ehsan; Rouhi, Kasra; Neshat, Mohammad; Faraji-Dana, Reza; Cabellos Aparicio, Alberto; Abadal Cavallé, Sergi; Alarcón Cot, Eduardo José (Nature, 2019-02-27)
    Article
    Open Access
    Recent emergence of metasurfaces has enabled the development of ultra-thin flat optical components through different wavefront shaping techniques at various wavelengths. However, due to the non-adaptive nature of conventional ...

  • Bipolar transistor vertical vertical scaling framework 

    Castañer Muñoz, Luis María; Alcubilla González, Ramón; Benavent, A (1994-12)
    Article
    Restricted access - publisher's policy
    Scaling factors for current and transit time are derived for polysilicon emitter, silicon based heterojunction bipolar transistors. It is shown that a simple set of analytical equations in integral form can be used to ...

  • Analysis of the conductance transient in thick film tin oxide gas sensors 

    Vilanova, X; Llobet Valero, Eduard; Alcubilla González, Ramón; Sueiras, Jl; Correig, X (Elsevier, 1996-03)
    Article
    Restricted access - publisher's policy
    In this paper, we analyse the conductance transient of a Taguchi TGS-822 sensor under a step change in the vapour concentration. A diffusion-limited range in the conductance transient is observed. Adjustments between the ...

  • 5GHz CMOS all-pass filter-based true time delay cell 

    Aghazadeh, Seyed Rasoul; Martínez García, Herminio; Saberkari, Alireza (2018-12-22)
    Article
    Open Access
    Analog CMOS time-delay cells realized by passive components, e.g., lumped LC delay lines, are inefficient in terms of area for multi-GHz frequencies. All-pass filters considered as active circuits can, therefore, be the ...

  • A comprehensive high-level model for CMOS-MEMS resonators 

    Banerji, Saoni; Fernández, Daniel; Madrenas Boadas, Jordi (2018-01-24)
    Article
    Open Access
    This paper presents a behavioral modeling technique for CMOS microelectromechanical systems (MEMS) microresonators that enables simulation of an MEMS resonator model in Analog Hardware Description Language format within a ...

  • A novel low-cost smart leaf wetness sensor 

    Hornero Ocaña, Gemma; Gaitán Pitre, Jorge Elicer; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar; Pallàs Areny, Ramon (2017-12-01)
    Article
    Open Access

  • Space charge recombination in p-n junctions with a discrete and continous trap distribution 

    Pallarès Marzal, Josep; Marsal Garví, Lluís Francesc; Correig, Xavier; Calderer Cardona, Josep; Alcubilla González, Ramón (1997-01)
    Article
    Restricted access - publisher's policy
    Space charge Shockley-Read-Hall recombination currents in the presence of discrete or continuous distributions of recombination centres are analysed. For a single level trap, depending on its position inside the forbidden ...

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