Correlated Wave-Functions and the Absence of Long Range Order in Numerical Studies of the Hubbard Model

We present a formulation of the Constrained Path Monte Carlo (CPMC) method for fermions that uses trial wave-functions that include many-body effects. This new formulation allows us to implement a whole family of generalized mean-field states as constraints. As an example, we calculated superconducting pairing correlation functions for the two-dimensional repulsive Hubbard model using a BCS trial state as the constraint. We compared the results with the case where a free-electron trial wave-function is used. We found that the correlation functions are independent of which state is used as the constraint, which reaffirms the results previously found by Zhang et. al regarding the suppression of long range pairing correlations as the system size increases.Comment: 15 pages, 3 figures, submitted to Phys. Rev.

Type-Specific Identification of Genital Human Papillomavirus Infection in Women with Cytological Abnormality

Objectives: To estimate the frequency of human papillomavirus (HPV) infection and the genotype distribution of HPV among women with a Pap smear showing atypical squamous cells of undetermined significance (ASC-US) attending the Program for the Detection and Control of Cervical Cancer in Bogotá, Colombia. Study Design: Cervical samples from 200 women with an ASC-US Pap smear were analyzed for the presence of HPV DNA and genotype distribution using a commercial molecular technique (Linear Array®; Roche Molecular Systems, USA). Results: HPV infection was found in 140 women (70%). High-risk HPV types were present in 46.4% of the samples; 16.4% showed a low-risk HPV type, and 37.1% showed both. Of the positive samples, 42.9% were infected with a single viral genotype, whereas 57.1% exhibited multiple HPV infections. The most common HPV genotypes were HPV 16, 53, and 52 with a prevalence of 26.4, 16.4, and 13.6%, respectively. Conclusion: The epidemiological characterization of HPV infections described in this study might guide actions for epidemiological surveillance to strengthen the program in Bogotá and to develop appropriate HPV vaccination programs.Instituto de Genética Veterinari

Quantum Algorithms for Fermionic Simulations

We investigate the simulation of fermionic systems on a quantum computer. We show in detail how quantum computers avoid the dynamical sign problem present in classical simulations of these systems, therefore reducing a problem believed to be of exponential complexity into one of polynomial complexity. The key to our demonstration is the spin-particle connection (or generalized Jordan-Wigner transformation) that allows exact algebraic invertible mappings of operators with different statistical properties. We give an explicit implementation of a simple problem using a quantum computer based on standard qubits.Comment: 38 pages, 2 psfigur

Periodontal Disease and Nuclear and Oxidative DNA Damage

Oral health is an important aspect of the overall health status of an individual. DNA damage has been associated with oral health and dental factors due to the increased of oxidative stress (OxS). DNA damage can produce a wide range of effects on human health. These effects could appear immediately, but others do not become evident much later. Chronic diseases have been study to understand their mechanisms, clinical implications, and the development of secondary disease such as cancer. Periodontitis is one of the most common oral diseases. It is an inflammatory chronic infectious disease, which is characterized by the loss of supporting tissues and tooth loss caused by periodontopathogens and long-term release of reactive oxygen species (ROS); thus, oxidative stress is increased during periodontitis. Oxidative stress can produce DNA damage, including the oxidation of nucleosides, which could cause DNA strand break. This oxidative damage leads the formation of micronuclei (MN) a marker of nuclear damage. Also, oxidative stress increased 8-hydroxy-2′-deoxyguanosine levels which are the most common stable product of oxidative DNA damage

Hacia la construcción de la plataforma integrada de información para el sector salud de México

Objetivo. Estandarizar técnica, funcional y operativamente los principales sistemas de información en salud de la Subsecretaria de Promoción y Prevención de la Salud de México (SPPS) de la Secretaría de Salud Federal (SSA). Metodología. Se realizó el diagnóstico de los sistemas de información de la SPPS y se priorizaron los hallazgos con base en los requerimientos y necesidades, para llevar a cabo las acciones de estandarización, mantenimiento y actualización. Resultados. Se evaluaron y realizaron mejoras a nueve sistemas de información, mismos que se encuentran operando de manera regular o en fase pre-operativa para el apoyo del monitoreo de programas preventivos.Sociedad Argentina de Informática e Investigación Operativ

Analyzing the turbulent planetary boundary layer by remote sensing systems: the Doppler wind lidar, aerosol elastic lidar and microwave radiometer

he planetary boundary layer (PBL) is the lowermost region of troposphere and is endowed with turbulent characteristics, which can have mechanical and/or thermodynamic origins. This behavior gives this layer great importance, mainly in studies about pollutant dispersion and weather forecasting. However, the instruments usually applied in studies of turbulence in the PBL have limitations in spatial resolution (anemometer towers) or temporal resolution (instrumentation aboard an aircraft). Ground-based remote sensing, both active and passive, offers an alternative for studying the PBL. In this study we show the capabilities of combining different remote sensing systems (microwave radiometer – MWR, Doppler lidar – DL – and elastic lidar – EL) for retrieving a detailed picture on the PBL turbulent features. The statistical moments of the high frequency distributions of the vertical wind velocity, derived from DL, and of the backscattered coefficient, derived from EL, are corrected by two methodologies, namely first lag correction and -2=3 law correction. The corrected profiles, obtained from DL data, present small differences when compared with the uncorrected profiles, showing the low influence of noise and the viability of the proposed methodology. Concerning EL, in addition to analyzing the influence of noise, we explore the use of different wavelengths that usually include EL systems operated in extended networks, like the European Aerosol Research Lidar Network (EARLINET),This work was supported by the Andalusia Regional Government through project P12-RNM-2409 and by the Spanish Agencia Estatal de Investigación (AEI) through projects CGL2016-81092-R and CGL2017-90884-REDT. We acknowledge the financial support by the European Union’s Horizon 2020 research and innovation program through project ACTRIS-2 (grant agreement no. 654109)

Hacia la construcción de la plataforma integrada de información para el sector salud de México

Objetivo. Estandarizar técnica, funcional y operativamente los principales sistemas de información en salud de la Subsecretaria de Promoción y Prevención de la Salud de México (SPPS) de la Secretaría de Salud Federal (SSA). Metodología. Se realizó el diagnóstico de los sistemas de información de la SPPS y se priorizaron los hallazgos con base en los requerimientos y necesidades, para llevar a cabo las acciones de estandarización, mantenimiento y actualización. Resultados. Se evaluaron y realizaron mejoras a nueve sistemas de información, mismos que se encuentran operando de manera regular o en fase pre-operativa para el apoyo del monitoreo de programas preventivos.Sociedad Argentina de Informática e Investigación Operativ

Hacia la construcción de la plataforma integrada de información para el sector salud de México

Objetivo. Estandarizar técnica, funcional y operativamente los principales sistemas de información en salud de la Subsecretaria de Promoción y Prevención de la Salud de México (SPPS) de la Secretaría de Salud Federal (SSA). Metodología. Se realizó el diagnóstico de los sistemas de información de la SPPS y se priorizaron los hallazgos con base en los requerimientos y necesidades, para llevar a cabo las acciones de estandarización, mantenimiento y actualización. Resultados. Se evaluaron y realizaron mejoras a nueve sistemas de información, mismos que se encuentran operando de manera regular o en fase pre-operativa para el apoyo del monitoreo de programas preventivos.Sociedad Argentina de Informática e Investigación Operativ