I was born in Valencia, Venezuela, the fourth child of Teofilo and Trina, out of a total of six children. I studied for a Bachelor's Degree in Physics and a Master's Degree at the Simón Bolívar University, and a doctorate from the Venezuelan Institute for Scientific Research. I did almost all sports, that is why I still have the domain of directing the soccer ball wherever I want. I have two children, a lady, and a boy. I am the widower of the mother of the daughter, the second child, I am a single father. I like to do research on: Functional analysis Number theory, quantum mechanics, and classical fluids. I am a physicist, an expert in classical and quantum computing and information.
Solute transport through heterogeneous porous media is governed by fuid advection, molecular diff... more Solute transport through heterogeneous porous media is governed by fuid advection, molecular diffusion and anisotropic dispersion. The dispersion is assumed to obey Fick's law and the dispersion coefficient is defined as a second rank tensor. However, this problem has revealed to be a very difficult one because independently of the numerical methods employed, the solutions are seen to exhibit artificial oscillations and negative concentrations when the dispersivity becomes anisotropic. Here we report consistent SPH simulations of the anisotropic dispersion of a Gaussian contaminant plume in porous media using the open source code DualSPHysics. Consistency of the SPH method is restored by increasing the spatial resolution along with the number of neighbours within the compact support of the interpolating kernel. The solution shows that as the number of neighbours is increased with resolution, full convergence of the numerical solutions is guaranteed regardless of the dispersivity...
We study a device for entangling electrons as cotunneling occurs through a quantum dot where on-s... more We study a device for entangling electrons as cotunneling occurs through a quantum dot where on-site electron-electron interactions U are in place. The main advantage of this device is that single particle processes are forbidden by energy conservation as proposed by Oliver et aloli02. Within this model we calculated two electron transition amplitude, in terms of the T-matrix, to all orders in the coupling to the dot, and consider a finite lead bandwidth. The model filters singlet entangled pairs with the sole requirement of Pauli principle. Feynman paths involving consecutive and doubly occupied dot interfere destructively and produce a transition amplitude minimum at a critical value of the onsite repulsion U. Singlet filtering is demonstrated as a function of a gate voltage applied to the dot with a special resonance condition when the dot levels are symmetrically placed about the input lead energy.
Solute transport through heterogeneous porous media is governed by fluid advection, molecular dif... more Solute transport through heterogeneous porous media is governed by fluid advection, molecular diffusion and anisotropic dispersion. The dispersion is assumed to obey Fick’s law and the dispersion coefficient is defined as a second rank tensor. However, this problem has revealed to be a very difficult one because independently of the numerical methods employed, the solutions are seen to exhibit artificial oscillations and negative concentrations when the Jaime Klapp (Corresponding author) Departamento de F́ısica, Instituto Nacional de Investigaciones Nucleares (ININ) Carretera México-Toluca km. 36.5, La Marquesa, 52750 Ocoyoacac, Estado de México, Mexico E-mail: jaime.klapp@inin.gob.mx Leonardo Di G. Sigalotti (Corresponding author) Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana Azcapotzalco (UAM-A) Av. San Pablo 180, 02200 Ciudad de México, Mexico Tel.: +52 55 21761287 E-mail: leonardo.sigalotti@gmail.com Carlos E. Alvarado-Rodŕıguez Dirección de Cátedras CONAC...
Los experimentos de Kranchenko [1] en la década de los 90, en muestras mesoscópicas, demostraron ... more Los experimentos de Kranchenko [1] en la década de los 90, en muestras mesoscópicas, demostraron el papel fundamental que presenta la interacción de Coulomb entre electrones en la transición de fase metalaislante. La aproximación de electrón independiente en un desarrollo teórico y el tratamiento perturbativo de la interacción no explica de manera satisfactoria los resultados anteriores. La necesidad de realizar acercamientos no perturbativos al problema, conlleva a proponer modelos de muchos cuerpos en redes ...
In a recent Comment, Perali, Pieri, and Strinati Phys. Rev. B 68, 066501 2003 came forward with a... more In a recent Comment, Perali, Pieri, and Strinati Phys. Rev. B 68, 066501 2003 came forward with a correction to the work of Soares et al. Phys. Rev. B 65, 174506 2002, in the sense that they correctly found no nonpairing region in the density vs coupling diagram of the two-dimensional attractive Hubbard model for a d-wave symmetry for the order parameter. But, the BCS-Bose-Einstein crossover diagram also changes, a point missed by Perali, Pieri, and Strinati in their Comment. Furthermore, they use an analytical treatment of the gap ...
The existence of a crossover from BCS superconductivy to a Bose-Einstein condensation BEC has bee... more The existence of a crossover from BCS superconductivy to a Bose-Einstein condensation BEC has been extensively discussed in recent years. These ideas come from the pioneering works of Eagles, 2 Leggett, 3 and Nozieres and Schmitt-Rink. 4 However, the latest interest in the crossover problem is due to its possible application to the understanding of the rich phase diagram of high-temperature superconductors HTSC's. 5, 6 However, the mechanism of hightemperature superconductivity in the cuprates remains a puzzle. 7 Many cuprates ...
The propagation of thermal and magnetohydrodynamic (MHD) waves in a heat-conducting, hydrogen pla... more The propagation of thermal and magnetohydrodynamic (MHD) waves in a heat-conducting, hydrogen plasma, threaded by an external uniform magnetic field ([bold B]) and in which photoionization and photorecombination processes are progressing, is investigated here using linear analysis. The resulting dispersion equation is solved analytically for varied strength and and orientation of the magnetic field, where β denotes the ratio of plasma to magnetic pressures. Application of this model to the interstellar medium shows that heat ...
Abstract We consider the field configuration produced in a system of two intercalcated concentric... more Abstract We consider the field configuration produced in a system of two intercalcated concentric coils of radius a and pitch Λ carrying currents in opposite directions (magnetic wigglers). The magnetic field and vector potential inside are obtained exactly at the coils axis and in a multipole‐type expansion off the axis. The effect of finite coils is also considered.
Solute transport through heterogeneous porous media is governed by fuid advection, molecular diff... more Solute transport through heterogeneous porous media is governed by fuid advection, molecular diffusion and anisotropic dispersion. The dispersion is assumed to obey Fick's law and the dispersion coefficient is defined as a second rank tensor. However, this problem has revealed to be a very difficult one because independently of the numerical methods employed, the solutions are seen to exhibit artificial oscillations and negative concentrations when the dispersivity becomes anisotropic. Here we report consistent SPH simulations of the anisotropic dispersion of a Gaussian contaminant plume in porous media using the open source code DualSPHysics. Consistency of the SPH method is restored by increasing the spatial resolution along with the number of neighbours within the compact support of the interpolating kernel. The solution shows that as the number of neighbours is increased with resolution, full convergence of the numerical solutions is guaranteed regardless of the dispersivity...
We study a device for entangling electrons as cotunneling occurs through a quantum dot where on-s... more We study a device for entangling electrons as cotunneling occurs through a quantum dot where on-site electron-electron interactions U are in place. The main advantage of this device is that single particle processes are forbidden by energy conservation as proposed by Oliver et aloli02. Within this model we calculated two electron transition amplitude, in terms of the T-matrix, to all orders in the coupling to the dot, and consider a finite lead bandwidth. The model filters singlet entangled pairs with the sole requirement of Pauli principle. Feynman paths involving consecutive and doubly occupied dot interfere destructively and produce a transition amplitude minimum at a critical value of the onsite repulsion U. Singlet filtering is demonstrated as a function of a gate voltage applied to the dot with a special resonance condition when the dot levels are symmetrically placed about the input lead energy.
Solute transport through heterogeneous porous media is governed by fluid advection, molecular dif... more Solute transport through heterogeneous porous media is governed by fluid advection, molecular diffusion and anisotropic dispersion. The dispersion is assumed to obey Fick’s law and the dispersion coefficient is defined as a second rank tensor. However, this problem has revealed to be a very difficult one because independently of the numerical methods employed, the solutions are seen to exhibit artificial oscillations and negative concentrations when the Jaime Klapp (Corresponding author) Departamento de F́ısica, Instituto Nacional de Investigaciones Nucleares (ININ) Carretera México-Toluca km. 36.5, La Marquesa, 52750 Ocoyoacac, Estado de México, Mexico E-mail: jaime.klapp@inin.gob.mx Leonardo Di G. Sigalotti (Corresponding author) Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana Azcapotzalco (UAM-A) Av. San Pablo 180, 02200 Ciudad de México, Mexico Tel.: +52 55 21761287 E-mail: leonardo.sigalotti@gmail.com Carlos E. Alvarado-Rodŕıguez Dirección de Cátedras CONAC...
Los experimentos de Kranchenko [1] en la década de los 90, en muestras mesoscópicas, demostraron ... more Los experimentos de Kranchenko [1] en la década de los 90, en muestras mesoscópicas, demostraron el papel fundamental que presenta la interacción de Coulomb entre electrones en la transición de fase metalaislante. La aproximación de electrón independiente en un desarrollo teórico y el tratamiento perturbativo de la interacción no explica de manera satisfactoria los resultados anteriores. La necesidad de realizar acercamientos no perturbativos al problema, conlleva a proponer modelos de muchos cuerpos en redes ...
In a recent Comment, Perali, Pieri, and Strinati Phys. Rev. B 68, 066501 2003 came forward with a... more In a recent Comment, Perali, Pieri, and Strinati Phys. Rev. B 68, 066501 2003 came forward with a correction to the work of Soares et al. Phys. Rev. B 65, 174506 2002, in the sense that they correctly found no nonpairing region in the density vs coupling diagram of the two-dimensional attractive Hubbard model for a d-wave symmetry for the order parameter. But, the BCS-Bose-Einstein crossover diagram also changes, a point missed by Perali, Pieri, and Strinati in their Comment. Furthermore, they use an analytical treatment of the gap ...
The existence of a crossover from BCS superconductivy to a Bose-Einstein condensation BEC has bee... more The existence of a crossover from BCS superconductivy to a Bose-Einstein condensation BEC has been extensively discussed in recent years. These ideas come from the pioneering works of Eagles, 2 Leggett, 3 and Nozieres and Schmitt-Rink. 4 However, the latest interest in the crossover problem is due to its possible application to the understanding of the rich phase diagram of high-temperature superconductors HTSC's. 5, 6 However, the mechanism of hightemperature superconductivity in the cuprates remains a puzzle. 7 Many cuprates ...
The propagation of thermal and magnetohydrodynamic (MHD) waves in a heat-conducting, hydrogen pla... more The propagation of thermal and magnetohydrodynamic (MHD) waves in a heat-conducting, hydrogen plasma, threaded by an external uniform magnetic field ([bold B]) and in which photoionization and photorecombination processes are progressing, is investigated here using linear analysis. The resulting dispersion equation is solved analytically for varied strength and and orientation of the magnetic field, where β denotes the ratio of plasma to magnetic pressures. Application of this model to the interstellar medium shows that heat ...
Abstract We consider the field configuration produced in a system of two intercalcated concentric... more Abstract We consider the field configuration produced in a system of two intercalcated concentric coils of radius a and pitch Λ carrying currents in opposite directions (magnetic wigglers). The magnetic field and vector potential inside are obtained exactly at the coils axis and in a multipole‐type expansion off the axis. The effect of finite coils is also considered.
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