Browsing by Subject "Difusió (Física)"
Now showing items 1-20 of 20
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A General Method to Compute Numerical Dispersion Error
(2021)
Conference report
Open AccessThis article presents a new methodology to compute numerical dispersion error. The analysis here presented is not restricted to uniform structured meshes nor linear discrete operators as it does not rely on sinusoids to ... -
A new general method to compute dispersion errors on Cartesian stretched meshes for both linear and non-linear operators
(2022-02-01)
Article
Restricted access - publisher's policyThe present article presents a new analysis for the dispersion error and the methodology to evaluate it numerically. Here we present the spectral properties of several convective schemes, including non-linear ones, on ... -
Càlcul de la difusió intraocular a partir de la MTF per diferents dimensions de la imatge de doble pas
(Universitat Politècnica de Catalunya, 2014-06-30)
Bachelor thesis
Open AccessActualment existeix molta recerca pel què fa a l’estudi de la qualitat de la imatge retinal ja que, dels passos que intervenen en la visió, és l’únic de moment que podem millorar. Aquesta qualitat es veu afectada per les ... -
Chemical and nanoindentation study of diffusion during sintering of 12Ce-ZrO2/3Y-ZrO2 powder layers
(2018-02-01)
Article
Restricted access - publisher's policyTetragonal zirconia polycrystals doped with 3% mol of yttria (3Y-ZrO2) exhibit excellent mechanical properties and biocompatibility. However, under humid environments, their surface structural integrity is degraded by aging ... -
Colonización de la Galaxia por una civilización extraterrestre tecnológicamente avanzada
(Universitat Politècnica de Catalunya, 2019-10-31)
Bachelor thesis
Open AccessCon el descomunal tamaño del universo y la cantidad de planetas que hay, es muy extraño que no hayamos tenido evidencias claras de vida extraterrestre en todo el periodo de existencia de la humanidad. En este proyecto se ... -
Complex time dependent patterns in the Soret regime
(2023)
Conference report
Open Access -
Correlació de la mesura de la difusió intraocular a partir de l'anàlisi de les imatges de doble pas amb les aberracions oculars en pacients amb cataractes
(Universitat Politècnica de Catalunya, 2018-06-27)
Bachelor thesis
Open AccessPropòsit: Avaluar clínicament la correlació entre la difusió intraocular (DIO) i les aberracions oculars (ABO) mitjançant l’anàlisi de les imatges de doble pas (DP) en ulls amb cataractes. Metodologia: L’estudi va comptar ... -
Correlación de la medida de la difusión intraocular a partir del análisis de las imágenes de DP con las aberraciones oculares en pacientes con alteraciones corneales
(Universitat Politècnica de Catalunya, 2019-05-22)
Bachelor thesis
Open AccessPropòsit: Determinar la informació de difusió intraocular del paràmetre FSI en pacients sans i pacients amb alteracions cornials. Disseny: Es tracta d'un estudi experimental, observacional, transversal i prospectiu de ... -
Diffuse interreflections : techniques for form-factor computation
(1990)
Research report
Open AccessThe purpose of this report is to present a characterization of the techniques proposed until now to model diffuse interreflections. Basic approaches are presented as well as the evolution of implementation strategies. In ... -
Diffusivity estimation for activator–inhibitor models: theory and application to intracellular dynamics of the actin cytoskeleton
(Springer Nature, 2021-06-01)
Article
Open AccessA theory for diffusivity estimation for spatially extended activator–inhibitor dynamics modeling the evolution of intracellular signaling networks is developed in the math- ematical framework of stochastic reaction–diffusion ... -
Effective diffusion in a stochastic velocity field
(Springer Verlag, 1993-04-01)
Article
Restricted access - publisher's policyAnalytical results are derived for the effective dispersion of a passive scalar in a stochastic velocity field evolving in a fast time scale. These results are favorably compared with direct computer simulation of ... -
Fast organic cation exchange in colloidal perovskite quantum dots toward functional optoelectronic applications
(2024-02-21)
Article
Open AccessColloidal quantum dots with lower surface ligand density are desired for preparing the active layer for photovoltaic, lighting, and other potential optoelectronic applications. In emerging perovskite quantum dots (PQDs), ... -
Influencia del número de elementos reemisores en el modelado de difusores durante la etapa de optimización
(2016-06)
Article
Open AccessEn el marco de trabajo del diseño óptico, el fenómeno de la difusión normalmente queda relegado a la fase final del estudio de tolerancias, momento en el que se valora su influencia en el sismtea ya diseñado. El hecho de ... -
Mesura de la difusió intraocular estimant zones excèntriques de les imatges de doble-pas
(Universitat Politècnica de Catalunya, 2014-06-30)
Bachelor thesis
Open AccessL’avaluació de la qualitat òptica ocular és una eina útil que proporciona informació objectiva de la visió. Gràcies als nous avenços tecnològics, la tècnica de doble pas pot enregistrar en un entorn clínic la imatge ... -
Nanoporous copper ribbons prepared by chemical dealloying of a melt-spun ZnCu alloy
(American Chemical Society (ACS), 2021-12-29)
Article
Restricted access - publisher's policyDealloying is a powerful and versatile method to fabricate three-dimensional nanoporous (np) materials with high surface area. In this work, we investigated the dealloying processes of Zn80Cu20 alloy ribbons in acidic and ... -
On the determination of diffusion coefficients in two-component alloys and doped semiconductors: several implications concerning the International Space Station
(2015-07-01)
Article
Open AccessThe accurate determination of mass diffusion coefficients is a technologically relevant problem that has implications on the modelling and control of material processes such as crystal growth and casting. It is also important ... -
Solvation structure and dynamics of the dimethylammonium cation diluted in liquid water: a molecular dynamics approach
(American Institute of Physics (AIP), 2020-06-21)
Article
Open AccessClassical molecular dynamics simulation techniques were employed to investigate the local solvation structure and related dynamics of the dimethylammonium cation diluted in liquid water at ambient conditions. The translational ... -
Study of preferential diffusion effects in a hydrogen premixed flame
(Universitat Politècnica de Catalunya, 2023-07-10)
Master thesis
Open AccessTransport phenomena give structure to flames, thus, being a key mechanism of combustion reactions. Molecular hydrogen (H2) combustion is characterized by strong preferential diffusion effects due to differences between the ... -
Thermal soil radon mitigation
(American Society of Mechanical Engineers (ASME), 2021-04-12)
Article
Open AccessIn this work consideration is given to the possibility for thermal soil radon mitigation. It is known that the diffusion coefficient of radon through minerals and rocks have are characterized by Arrhenius linear plots ... -
Weak disorder in periodic potentials: anomalous transport and diffusion
(2012-03-31)
Article
Restricted access - publisher's policyParticles driven through a periodic potential by an external constant force are known to exhibit a pronounced peak of the diffusion around the critical deterministic force that defines the transition between locked and ...
