494 research outputs found
Matemà tiques que milloren la comunicació
El soroll indesitjat en la comunicació digital distorsiona el missatge a transmetre, per la qual cosa els investigadors estudien com dissenyar bons codis de canal, una eina matemà tica que permet detectar i corregir els errors que es produeixen en la transmissió d'informació. Investigadors de la UAB han aconseguit definir nous codis de canal que permeten d'obtenir millors parà metres de qualitat.El ruido indeseado en la comunicación digital distorsiona el mensaje que se transmite, por lo que los investigadores estudian cómo diseñar buenos códigos de canal, una herramienta matemática que permite detectar y corregir los errores que se producen en la transmisión de información. Investigadores de la UAB han conseguido definir nuevos códigos de canal que permiten obtener mejores parámetros de calidad
3D vanadium oxide inverse opal growth by electrodeposition
Three-dimensional vanadium pentoxide (V2O5) material architectures in the form of inverse opals (IOs) were fabricated using a simple electrodeposition process into artificial opal templates on stainless steel foil using an aqueous solution of VOSO4.χH2O with added ethanol. The direct deposition of V2O5 IOs was compared with V2O5 planar electrodeposition and confirms a similar progressive nucleation and growth mechanism. An in-depth examination of the chemical and morphological nature of the IO material was performed using X-ray crystallography, X-ray photoelectron spectroscopy, Raman scattering and scanning/transmission electron microscopy. Electrodeposition is demonstrated to be a function of the interstitial void fraction of the artificial opal and ionic diffusivity that leads to high quality, phase pure V2O5 inverse opals is not adversely affected by diffusion pathway tortuosity. Methods to alleviate electrodeposited overlayer formation on the artificial opal templates for the fabrication of the porous 3D structures are also demonstrated. Such a 3D material is ideally suited as a cathode for lithium ion batteries, electrochromic devices, sensors and for applications requiring high surface area electrochemically active metal oxides
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