E-prints
http://hdl.handle.net/2117/28577
2017-12-13T19:32:09ZMuerte on line
http://hdl.handle.net/2117/111985
Muerte on line
Barceló García, Miquel
2017-12-13T19:16:22ZBarceló García, MiquelAutismo infotecnológico
http://hdl.handle.net/2117/111983
Autismo infotecnológico
Barceló García, Miquel
2017-12-13T19:10:31ZBarceló García, MiquelRadiation damage evaluation on AlGaAs/GaAs solar cells
http://hdl.handle.net/2117/111982
Radiation damage evaluation on AlGaAs/GaAs solar cells
García, E; Alcubilla González, Ramón; Prat Viñas, Lluís; Castañer Muñoz, Luis María
A computer model to evaluate radiation damage on AlGaAs-based solar cells is reported. The model is based on a piecewise approach that divides the cell structure in an adaptive number of slices. Inside a particular slice the semiconductor parameters are constant; consequently, it is easy to find an analytical solution of the semiconductor transport equations with suitable boundary conditions for the interfaces with the adjacent slices. The model provides all electrical parameters of the cells in the operating temperature range. Different structures, including graded band gaps and double heterofaces can be analyzed. Proton damage coefficients as well as proton damage ratios can be calculated for energies between 30 and 10/sup 4/ keV with only two adjustable parameters. Coirradiation experiments with different energy protons were simulated by improving the conventional method of degradation computering.
2017-12-13T19:09:28ZGarcía, EAlcubilla González, RamónPrat Viñas, LluísCastañer Muñoz, Luis MaríaA computer model to evaluate radiation damage on AlGaAs-based solar cells is reported. The model is based on a piecewise approach that divides the cell structure in an adaptive number of slices. Inside a particular slice the semiconductor parameters are constant; consequently, it is easy to find an analytical solution of the semiconductor transport equations with suitable boundary conditions for the interfaces with the adjacent slices. The model provides all electrical parameters of the cells in the operating temperature range. Different structures, including graded band gaps and double heterofaces can be analyzed. Proton damage coefficients as well as proton damage ratios can be calculated for energies between 30 and 10/sup 4/ keV with only two adjustable parameters. Coirradiation experiments with different energy protons were simulated by improving the conventional method of degradation computering.La ley de Internet
http://hdl.handle.net/2117/111977
La ley de Internet
Barceló García, Miquel
2017-12-13T18:58:21ZBarceló García, MiquelLa informática y la ley
http://hdl.handle.net/2117/111975
La informática y la ley
Barceló García, Miquel
2017-12-13T18:51:34ZBarceló García, MiquelInternet y la bola de cristal
http://hdl.handle.net/2117/111973
Internet y la bola de cristal
Barceló García, Miquel
2017-12-13T18:36:29ZBarceló García, MiquelModeling seismic wave propagation using staggered-grid mimetic finite differences
http://hdl.handle.net/2117/111972
Modeling seismic wave propagation using staggered-grid mimetic finite differences
Solano, Freysimar; Guevara-Jordan, Juan; González, Carlos; Rojas, Otilio; Otero Calviño, Beatriz
Mimetic finite difference (MFD) approximations of continuous gradient and divergente operators satisfy a discrete version of the Gauss-Divergente theorem on staggered grids. On the mimetic approximation of this integral conservation principle, an unique boundary flux operator is introduced that also intervenes on the discretization of a given boundary value problem (BVP). In this work, we present a second-order MFD scheme for seismic wave propagation on staggered grids that discretized free surface and absorbing boundary conditions (ABC) with same accuracy order. This scheme is time explicit after coupling a central three-level finite difference (FD) stencil for numerical integration. Here, we briefly discuss the convergence properties of this scheme and show its higher accuracy on a challenging test when compared to a traditional FD method. Preliminary applications to 2-D seismic scenarios are also presented and show the potential of the mimetic finite differene method.
2017-12-13T18:31:55ZSolano, FreysimarGuevara-Jordan, JuanGonzález, CarlosRojas, OtilioOtero Calviño, BeatrizMimetic finite difference (MFD) approximations of continuous gradient and divergente operators satisfy a discrete version of the Gauss-Divergente theorem on staggered grids. On the mimetic approximation of this integral conservation principle, an unique boundary flux operator is introduced that also intervenes on the discretization of a given boundary value problem (BVP). In this work, we present a second-order MFD scheme for seismic wave propagation on staggered grids that discretized free surface and absorbing boundary conditions (ABC) with same accuracy order. This scheme is time explicit after coupling a central three-level finite difference (FD) stencil for numerical integration. Here, we briefly discuss the convergence properties of this scheme and show its higher accuracy on a challenging test when compared to a traditional FD method. Preliminary applications to 2-D seismic scenarios are also presented and show the potential of the mimetic finite differene method.Sondas robóticas
http://hdl.handle.net/2117/111971
Sondas robóticas
Barceló García, Miquel
2017-12-13T18:30:10ZBarceló García, MiquelSingularidad tecnológica
http://hdl.handle.net/2117/111970
Singularidad tecnológica
Barceló García, Miquel
2017-12-13T18:15:41ZBarceló García, MiquelVOFTools - A software package of calculation tools for volume of fluid methods using general convex grids
http://hdl.handle.net/2117/111968
VOFTools - A software package of calculation tools for volume of fluid methods using general convex grids
López González, Juan Miguel; Hernandez, J; Gomez, P.; Faura, F.
The VOFTools library includes efficient analytical and geometrical routines for (1) area/volume computation, (2) truncation operations that typically arise in VOF (volume of fluid) methods, (3) area/volume conservation enforcement (VCE) in PLIC (piecewise linear interface calculation) reconstruction and(4) computation of the distance from a given point to the reconstructed interface. The computation of a polyhedron volume uses an efficient formula based on a quadrilateral decomposition and a 2D projection of each polyhedron face. The analytical VCE method is based on coupling an interpolation procedure to bracket the solution with an improved final calculation step based on the above volume computation formula. Although the library was originally created to help develop highly accurate advection and reconstruction schemes in the context of VOF methods, it may have more general applications. To assess the performance of the supplied routines, different tests, which are provided in FORTRAN and C, were implemented for several 2D and 3D geometries. Program summary: Program Title: VOFTools Program Files doi: http://dx.doi.org/10.17632/brrgt645bh.1 Licensing provisions: GNU General Public License, version 3. Programming language: FORTRAN and C, with C interfaces. Nature of problem: The package of routines includes simple and efficient analytical and geometrical tools for area/volume computation, truncation operations that typically arise in VOF (volume of fluid) methods, area/volume conservation enforcement (VCE) in PLIC (piecewise linear interface calculation) reconstruction and computation of the distance from a given point to the reconstructed interface. Solution method: The volume (area in 2D) computation of a polyhedron (polygon in 2D) uses an efficient formula based on a quadrilateral decomposition and a 2D projection of each polyhedron face. The analytical VCE method is based on coupling an interpolation bracketing procedure with an improved final calculation step based on the above volume computation formula. Also, the exact distance from a given point to a reconstructed polygonal interface is calculated. Restrictions: Convex 2D and 3D polytopes.
2017-12-13T18:09:37ZLópez González, Juan MiguelHernandez, JGomez, P.Faura, F.The VOFTools library includes efficient analytical and geometrical routines for (1) area/volume computation, (2) truncation operations that typically arise in VOF (volume of fluid) methods, (3) area/volume conservation enforcement (VCE) in PLIC (piecewise linear interface calculation) reconstruction and(4) computation of the distance from a given point to the reconstructed interface. The computation of a polyhedron volume uses an efficient formula based on a quadrilateral decomposition and a 2D projection of each polyhedron face. The analytical VCE method is based on coupling an interpolation procedure to bracket the solution with an improved final calculation step based on the above volume computation formula. Although the library was originally created to help develop highly accurate advection and reconstruction schemes in the context of VOF methods, it may have more general applications. To assess the performance of the supplied routines, different tests, which are provided in FORTRAN and C, were implemented for several 2D and 3D geometries. Program summary: Program Title: VOFTools Program Files doi: http://dx.doi.org/10.17632/brrgt645bh.1 Licensing provisions: GNU General Public License, version 3. Programming language: FORTRAN and C, with C interfaces. Nature of problem: The package of routines includes simple and efficient analytical and geometrical tools for area/volume computation, truncation operations that typically arise in VOF (volume of fluid) methods, area/volume conservation enforcement (VCE) in PLIC (piecewise linear interface calculation) reconstruction and computation of the distance from a given point to the reconstructed interface. Solution method: The volume (area in 2D) computation of a polyhedron (polygon in 2D) uses an efficient formula based on a quadrilateral decomposition and a 2D projection of each polyhedron face. The analytical VCE method is based on coupling an interpolation bracketing procedure with an improved final calculation step based on the above volume computation formula. Also, the exact distance from a given point to a reconstructed polygonal interface is calculated. Restrictions: Convex 2D and 3D polytopes.