The Site-Diluted Ising Model in Four Dimension

In the literature, there are five distinct, fragmented sets of analytic predictions for the scaling behaviour at the phase transition in the random-site Ising model in four dimensions. Here, the scaling relations for logarithmic corrections are used to complete the scaling pictures for each set. A numerical approach is then used to confirm the leading scaling picture coming from these predictions and to discriminate between them at the level of logarithmic corrections.Comment: 15 pages, 5 ps figures. Accepted for publication in Phys. Rev.

Evolución de la ley (AG/CU) en monedas árabes durante los siglos VIII al X D.C mediante SEM-EDX y TXRF

En este trabajo se presenta el estudio analítico, mediante fluorescencia de ra yos X por reflexión total (TXRF) y microscopía electrónica de barrido con aná lisis de energía dispersiva de rayos X (SEM-EDX). de un amplio grupo de mo nedas islámicas (532 piezas), con el fin de establecer una correlación entre la ley de la moneda islámica en España y los acontecimientos históricos más relevan tes tícurridos durante los siglos VIII al X d.C. Los resultados analíticos obteni dos han permitido establecer el proceso de devaluación en la riqueza de la alea- ción Ag/Cu. en este período. Las tendencias observadas se correlacionan con el déficit de plata sufrido por el estado Omeya de Córdoba. Por otro lado, la com binación de las técnicas de TXRF y SEM-EDX ha permitido caracterizar de forma concluyente la tecnología de la producción, así como la evolución histórica su frida por este tipo de materiales

Predictor factors of perceived health in family caregivers of people diagnosed with mild or moderate Alzheimer's disease

Caring for a person diagnosed with Alzheimer’s disease has a negative impact on family caregivers’ psychological health. This study examined the factors related to ‘perceived health’ and ‘presence of new-onset mental health problems’ in family caregivers of people diagnosed with mild and moderate Alzheimer’s disease. A cross-sectional observational study carried out in Almeria’s Healthcare District (Spain). A total of 255 family caregivers (42.4% cared for people with mild Alzheimer’s disease and 57.6% cared for people with moderate Alzheimer’s disease) participated in the study from January to December 2015. Mainly, caregivers were women (81.5% in the mild Alzheimer’s disease group and 88.4% in the moderate Alzheimer’s disease group), and their average age was 56.54 years (standard deviation (SD) = 13.13) and 54.47 years (SD = 11.71), respectively. Around 47% of the caregivers had been caring for the person with Alzheimer’s between two and five years. The Goldberg General Health Questionnaire was used to measure perceived health and the presence of new-onset mental health problems. An exploratory descriptive analysis and a multivariate logistic regression analysis were conducted. For caregivers of people with mild Alzheimer’s disease, ‘perceived health’ was related to ‘perceived social support’ (r = −0.21; p = 0.028), ‘person’s level of dependency’ (r = −0.24, p = 0.05), ‘severity of the person’s neuropsychiatric symptoms’ (r = 0.22; p = 0.05), and ‘caregiver’s emotional distress in response to the person’s neuropsychiatric symptoms’ (r = 0.22; p = 0.05). For caregivers of people with moderate Alzheimer’s disease, ‘perceived health’ was related to ‘perceived social support’ (r = −0.31; p ˂ 0.01), ‘presence of neuropsychiatric symptoms’ (r = 0.27, p = 0.01), ‘severity of the person’s neuropsychiatric symptoms’ (r = 0.32, p = 0.01) and ‘caregiver’s emotional distress in response to the person’s neuropsychiatric symptoms’ (r = 0.029; p = 0.01). The presence of new-onset mental health problems was detected in 46.3% (n = 50) of caregivers of people with mild Alzheimer’s and 61.9% (n = 91) of caregivers of people with moderate Alzheimer’s. When people are diagnosed with mild Alzheimer’s disease, intervention programs for caregivers should aim to regulate emotions and promote positive coping strategies. When people are diagnosed with moderate Alzheimer’s disease, intervention programs for caregivers must allow them to adapt to caregiving demands that arise with the progression of Alzheimer’s disease

A Study of Possible Applications of the Half-Projected Hartree-Fock Method for Determining Singlet Excited States

The Half-Projected Hartree-Fock model (HPHF) is proposed for determining open shell singlet states. Some properties of the HPHF wave function are reviewed in order to discuss its application to determining excited states of medium size molecules. A calculation procedure similar to that of the UHF method is described. Some results for the methylene biradical and formic acid are presented. The HPHF model is found to be useful for determining the lowest excited states

Non-singular radiation cosmological models

In this paper we analyse the possibility of constructing singularity-free inhomogeneous cosmological models with a pure radiation field as matter content. It is shown that the conditions for regularity are very easy to implement and therefore there is a huge number of such spacetimes.Comment: 13 pages, LaTex, ws-mpla, to appear in Modern Physics Letters

Counting states and the Hadron Resonance Gas: Does X(3872) count?

We analyze how the renowned X(3872), a weakly bound state right below the D¯D∗threshold, should effectively be included in a hadronic representation of the QCD partition function. This can be decided by analyzing the D¯D∗scattering phase-shifts in the JPC=1++channel and their contribution to the level density in the continuum from which the abundance in a hot medium can be determined. We show that in a purely molecular picture the bound state contribution cancels the continuum providing a vanishing occupation number density at finite temperature and the X (3872) does not count below the Quark-Gluon Plasma crossover happening at T∼150MeV. In contrast, within a coupled-channels approach, for a non vanishing c¯ccontent the cancellation does not occur due to the onset of the X (3940) which effectively counts as an elementary particle for temperatures above T _250MeV. Thus, a direct inclusion of the X (3872) in the Hadron Resonance Gas is not justified. We also estimate the role of this cancellation in X (3872) production in heavy-ion collision experiments in terms of the corresponding pT distribution due to a finite energy resolution.This work has been partially funded by the Span-ish Ministerio de Economia y Competitividad and European ERDF funds (Grant No. FIS2014-59386-P, FPA2016-77177-C2-2-P and FIS2017-85053-C2-1-P ), the Agencia de Innovacion y Desarrollo de Andalucia (Grant No. FQM225), and by Junta de Castilla y León and European Regional Development Funds (ERDF) under Contract no. SA041U16

A preliminary study about treg cells phenotypic alteration

Las células T reguladoras son una subpoblación de los linfocitos T CD4+ de gran importancia en el establecimiento y mantenimiento de la tolerancia y la homeostasis del sistema inmune. Muchos estudios han analizado la frecuencia de las Treg en pacientes infectados por VIH. Sin embargo, los resultados no son concluyentes y existe una gran controversia sobre el papel que juegan las Treg en el curso de la infección. Recientemente se ha demostrado que el VIH puede infectar las células Treg. Trabajos previos de nuestro grupo demuestran que las Treg son susceptibles de infección por el VIH disminuyendo la expresión del Foxp3 en las células infectadas. Este fenómeno produce una alteración en la capacidad supresora de las células Treg. El objetivo de éste estudio es corroborar dicho comportamiento in vivo y determinar el fenotipo de las Treg en pacientes infectados por VIH. Los resultados preliminares indican que efectivamente la frecuencia de células Foxp3+ es inferior en los pacientes infectados por VIH que en los individuos sanos. El estudio sigue en curso para recopilar un número suficiente de muestras que permitan confirmar estos resultados. Este estudio permitirá conocer mejor el papel de las Treg en el curso de la infección por VIHRegulatory T cells (Treg) are a subpopulation of CD4+ T cells that play a crucial role in establishing and maintaining self-tolerance and immune homeostasis. Many studies have explored the frequency of Treg in HIV infected patients. However, there are controversial findings about the role of these cells in the HIV infection. Nowadays, different studies have showed that Treg cells are susceptible to the HIV infection. Our in vitro data has showed that HIV infects Treg and produces a downregulation of Foxp3 expression. This phenomenon also leads Treg cells to a loss of their immune suppressive capacity. The aim of this study is to corroborate if this behavior also occurs in vivo and determine the Treg phenotype in HIVinfected patients. Preliminary results indicate that frequency of Foxp3+ cells is lower in HIVinfected patients than in healthy volunteers. At present, we are recovering enough number of samples to confirm these results. A better understanding of these cells could serve for the effective exploitation of their suppressive functions for clinical benefit