Exploració per tema "Lenses"

Ara es mostren els items 1-20 de 21

    • An architecture analysis for millimeter-wave optically steerable antenna array 

      Ballesteros Sánchez, Christian; Maestre, Marcos; Santos Blanco, M. Concepción; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      A lens-based integrated photodiode-antenna array for a Radio over Fiber (RoF) 5G wireless base station at millimeter-wave frequencies is proposed and analyzed. The elements of the array are based on slot bow-tie antennas ...

    • Assessment of LTCC-based dielectric flat lens antennas and switched-beam arrays for future 5G millimeter-wave communication systems 

      Imbert Villà, Marc; Romeu Robert, Jordi; Baquero Escudero, M.; Martinez Ingles, Maria Teresa; Molina-Garcia Pardo, Jose Maria; Jofre Roca, Lluís (2017-10-30)
      Article
      Accés obert
      IEEE This paper presents design, LTCC fabrication, and full experimental verification of novel dielectric flat lens antennas for future high data rate 5G wireless communication systems in the 60 GHz band. We introduce and ...

    • Awareness of treatment: a source of bias in subjective grading of ocular complications 

      Cardona Torradeflot, Genís; Esterich, Noelia (Public Library of Science (PLOS), 2019-12-26)
      Article
      Accés obert
      Purpose: Bias has been described as one important obstacle in scientific research. The aim of this study was to explore “awareness of treatment” as a possible source of bias in subjective grading of ocular complications. ...

    • Design of a dielectric flat lens antenna for 60 GHz WPAN applications 

      Imbert Villà, Marc; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper we present the design of a dielectric flat lens antenna to operate in the 60 GHz band for WPAN applications. In order to overcome the specific atmospheric attenuation, which characterizes the propagation in ...

    • En el 350 aniversario del nacimiento de Anton Van Leeuwenhoek 

      Urtubia Vicario, César (PUNTEX, 1983-12)
      Article
      Accés obert

    • En el 350 aniversario del nacimiento de Antoni van Leeuwenhoek (y II). Su obra. 

      Urtubia Vicario, César; Antó Roca, Joan (PUNTEX, 1984-05)
      Article
      Accés obert

    • Fabrication of microlens in polymers with thermal reflow 

      Badar, Farhan (Universitat Politècnica de Catalunya, 2012-09-12)
      Projecte Final de Màster Oficial
      Accés obert
      [ANGLÈS] This study shows that it is possible to fabricate lenses with a very small diameter by depositing and melting the photoresist layer on a glass substrate. Thermal Reflow technique has been used to melt the top ...

    • How to establish an adequate system for eye lens dose monitoring: a proposal for typical workplaces 

      Kollaard, Robert; Carinou, Eleftheria; Ginjaume Egido, Mercè; Struelens, L. (2019-12-31)
      Article
      Accés restringit per política de l'editorial
      For years, the dose limit of 150 mSv for occupational exposure of the lens of the eye to ionising radiation was rarely exceeded, and the dose to the eye was only monitored occasionally. With the national implementation of ...

    • Image formation with lenses, pinholes and slits in an optical box 

      Escofet Soteras, Jaume; Pérez Cabré, Elisabet (Hands-on Science Network, 2023)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Images formed by systems with small apertures, such as pinholes and slits, have very weak illumination. It is advisable an object with a high luminance and with considerable size to see these images. Besides, the device ...

    • Lents hologràfiques: funcionament i percepció 

      Muñoz Calahorro, Adrià (Universitat Politècnica de Catalunya, 2020-06)
      Treball Final de Grau
      Accés obert
      La tecnología de realitat virtual sempre ha tingut un futur incert des dels seus inicis. Als anys 50, la creació del Sensorama ja va demostrar l’ambició de l’espècie humana per endinsar-se en una realitat alternativa i, ...

    • Matching layer design to improve the performance of an inhomogeneous dielectric flat lens at millimeter-wave frequencies 

      Imbert Villà, Marc; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper, the design of a matching layer to increase the maximum achievable gain, reduce the back-radiation, and enhance the bandwidth performance of a dielectric flat lens antenna for millimeter-wave applications is ...

    • Montaje de lentes monofocales con biseladora automática 

      Aguirre Polo, Montserrat; Martínez Roda, Juan Antonio (2008-10-06)
      Audiovisual
      Accés obert

    • OUFTI-NEXT : study of refractive lenses for an infrared camera 

      Riera Salvà, Anna (Universitat Politècnica de Catalunya, 2019-05-22)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Université de Liège / Centre Spatial de Liège
      The aim of this master thesis is to survey the capability of a refractive design to accommodate the requirements of the OUFTI-NEXT payload. The optical design for thermal infrared camera is challenging:• the lack of glass ...

    • Parameter design of a biaxial lidar ceilometer 

      Gregorio López, Eduard; Rocadenbosch Burillo, Francisco; Tiana Alsina, Jordi; Comerón Tejero, Adolfo; Sanz Cortiella, Ricardo; Rosell Polo, Joan Ramon (2012-07-11)
      Article
      Accés restringit per política de l'editorial
      This paper presents parameter design methodology and related optomechanical engineering of a 905-nm diode-laser biaxial, eye-safe lidar ceilometer prototype for cloud-height monitoring. Starting with a brief review of the ...

    • Photonic crystal spatial filtering in broad aperture diode laser 

      Gawali, Sandeep Babu; Gailevicius, Darius; Garre Werner, Guillermo; Purlys, Vytautas; Cojocaru, Crina; Trull Silvestre, José Francisco; Montiel Ponsoda, Joan; Staliunas, Kestutis (2019-10-02)
      Article
      Accés obert
      Broad aperture semiconductor lasers usually suffer from low spatial quality of the emitted beams. Due to the highly compact character of such lasers, the use of conventional intracavity spatial filters is problematic. We ...

    • Reducing speckle in double-pass systems using focus tunable lenses 

      García Guerra, Carlos Enrique; Aldaba Arévalo, Mikel; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Speckle arises in double-pass systems when coherent light is reflected by the retina. Since it degrades the images that are used to characterize the eye, there is special attention in reducing speckle when working with ...

    • Repeatability, reproducibility, and accuracy of a novel pushbroom hyperspectral system 

      Vilaseca Ricart, Meritxell; Delpueyo Español, Xana; Chorro Calderón, Elisabet; Perales Romero, Esther; Pujol Ramo, Jaume; Hirvonen, Tapani; Schael, Barbara (2013)
      Article
      Accés obert

    • Sharp acoustic vortex focusing by Fresnel-spiral zone plates 

      Jimenez, Noe; Romero García, Vicenç; Garcia Raffi, Luis Miguel; Staliunas, Kestutis (2018-05-14)
      Article
      Accés obert
      We report the optimal focusing of acoustic vortex beams by using flat lenses based on a Fresnel- spiral diffraction grating. The flat lenses are designed by spiral-shaped Fresnel zone plates composed of one or several arms. ...

    • Spherical refractive correction with an electro-optical iquid lens in a double-pass system 

      Sanàbria Ortega, Ferran; Díaz Douton, Fernando; Aldaba Arévalo, Mikel; Pujol Ramo, Jaume (2013-09-06)
      Article
      Accés obert

    • Uso de técnicas de Inteligencia Artificial para la optimización de la potencia de lentes intraoculares para pacientes que sufren Cataratas 

      Higuero Morales, Claudia (Universitat Politècnica de Catalunya, 2021-07-09)
      Treball Final de Grau
      Accés obert
      En este proyecto se pretende crear una red neuronal que optimice la posición de la lente efectiva en las operaciones de cataratas. Hoy en día para intentar averiguar la posición efectiva de la lente se siguen utilizando ...