Interaction energy functional for lattice density functional theory: Applications to one-, two- and three-dimensional Hubbard models

The Hubbard model is investigated in the framework of lattice density functional theory (LDFT). The single-particle density matrix $\gamma_{ij}$ with respect the lattice sites is considered as the basic variable of the many-body problem. A new approximation to the interaction-energy functional $W[\gamma]$ is proposed which is based on its scaling properties and which recovers exactly the limit of strong electron correlations at half-band filling. In this way, a more accurate description of $W$ is obtained throughout the domain of representability of $\gamma_{ij}$, including the crossover from weak to strong correlations. As examples of applications results are given for the ground-state energy, charge-excitation gap, and charge susceptibility of the Hubbard model in one-, two-, and three-dimensional lattices. The performance of the method is demonstrated by comparison with available exact solutions, with numerical calculations, and with LDFT using a simpler dimer ansatz for $W$. Goals and limitations of the different approximations are discussed.Comment: 25 pages and 8 figures, submitted to Phys. Rev.

¿Es Husserl un disyuntivista? La fenomenología ante un problema contemporáneo de la filosofía de la percepción

Under the framework of static phenomenology, I will introduce the Husserlian descriptions of the relation between sensible content and apprehension (Inhalt-Auffassungsschema), and the non-representationalist approach to perception of transcendental phenomenology. In order to place Husserlian phenomenology in a context marked by disjunctivism, I will confront some objections that emerged from certain readings of the transcendental method. Finally, I will reject the tightness of the debate between disjunctivists and representationalists, giving way to the possibilities opened by phenomenology in the description of perception

La tradition allemande dans la philosophie, de Alain Badiou y Jean-Luc Nancy

Reseña en español del diálogo entre A. Badiou y J.-L. Nancy, editado por Jan Völker y publicado en 2017

La primacía de la percepción en la teoría husserliana temprana de la imaginación

Este artículo está enfocado en la primera etapa de las investigaciones husserlianas sobre la imaginación, enmarcadas en su obra “estática” y determinadas, especialmente, por las características de una concepción centrada en la imagen figurativa (Abbild)

Norovirus Infection and Disease in an Ecuadorian Birth Cohort: Association of Certain Norovirus Genotypes With Host FUT2 Secretor Status.

BACKGROUND: Although norovirus is the most common cause of gastroenteritis, there are few data on the community incidence of infection/disease or the patterns of acquired immunity or innate resistance to norovirus. METHODS: We followed a community-based birth cohort of 194 children in Ecuador with the aim to estimate (1) the incidence of norovirus gastroenteritis from birth to age 3 years, (2) the protective effect of norovirus infection against subsequent infection/disease, and (3) the association of infection and disease with FUT2 secretor status. RESULTS: Over the 3-year period, we detected a mean of 2.26 diarrheal episodes per child (range, 0-12 episodes). Norovirus was detected in 260 samples (18%) but was not found more frequently in diarrheal samples (79 of 438 [18%]), compared with diarrhea-free samples (181 of 1016 [18%]; P = .919). A total of 66% of children had at least 1 norovirus infection during the first 3 years of life, and 40% of children had 2 infections. Previous norovirus infections were not associated with the risk of subsequent infection. All genogroup II, genotype 4 (GII.4) infections were among secretor-positive children (P < .001), but higher rates of non-GII.4 infections were found in secretor-negative children (relative risk, 0.56; P = .029). CONCLUSIONS: GII.4 infections were uniquely detected in secretor-positive children, while non-GII.4 infections were more often found in secretor-negative children

Semblanzas de los toreros del día

Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 2012-201

El sector pecuario y la tecnificación fiscal. Las tribulaciones de un productor

El propósito de este artículo es reflexionar y presentar evidencias de primera mano sobre las complicaciones, costos e irregularidades que los productores del sector primario enfrentan ante la disposición hacendaria (a través del Servicio de Administración Tributaria, SAT) de emitir comprobante fiscal digital (CFDI) al vender productos del campo.ITESO, A.C

Construcción de una memoria organizacional a partir de textos no estructurados usando herramientas de minería de texto

Trabajo que tuvo como propósito construir una memoria organizacional de los Reportes de Proyectos de Aplicación Profesional (PAP) a partir de texto no estructurado usando herramientas de minería de texto. El objetivo fue brindar una herramienta a la Coordinación PAP para obtener estadísticas, información de interés, aprendizajes y experiencias plasmadas por los alumnos en sus reportes que ayuden a generar nuevo proyectos, mejorar existentes, facilitar la toma de decisiones, así como llevar un registro de las vinculaciones entre instituciones públicas y/o privadas y el ITESO.Consejo Nacional de Ciencia y Tecnologí

Extreme Quiescent Variability of the Transient Neutron Star Low-mass X-ray Binary EXO 1745-248 in Terzan 5

EXO 1745-248 is a transient neutron-star low-mass X-ray binary that resides in the globular cluster Terzan 5. We studied the transient during its quiescent state using 18 Chandra observations of the cluster acquired between 2003 and 2016. We found an extremely variable source, with a luminosity variation in the 0.5-10 keV energy range of $\sim3$ orders of magnitude (between $3\times10^{31}$ erg s$^{-1}$ and $2\times10^{34}$ erg s$^{-1}$) on timescales from years down to only a few days. Using an absorbed power-law model to fit its quiescent spectra, we obtained a typical photon index of $\sim1.4$, indicating that the source is even harder than during outburst and much harder than typical quiescent neutron stars if their quiescent X-ray spectra are also described by a single power-law model. This indicates that EXO 1745-248 is very hard throughout the entire observed X-ray luminosity range. At the highest luminosity, the spectrum fits better when an additional (soft) component is added to the model. All these quiescent properties are likely related to strong variability in the low-level accretion rate in the system. However, its extreme variable behavior is strikingly different from the one observed for other neutron star transients that are thought to still accrete in quiescence. We compare our results to these systems. We also discuss similarities and differences between our target and the transitional millisecond pulsar IGR J18245-2452, which also has hard spectra and strong variability during quiescence.Comment: Accepted for publication in MNRA

Dictamen juridico de el derecho que assiste a el Marques de Albudeyte, Don Luis Teixeyro de Valcarce y Vozmediano... en el expediente consultivo... con Don Juan de Sandoval... y con el curador... del Conde de Montealegre...

Precede al Tit. : "Jesús, María y Joseph..."Texto fechado en Valladolid el 22 de Febrero de 1763Sign. : A-G2Port. con orla ti