La poesía de Abelardo Vázquez

En la presente nota se efectúa una síntesis biográfica de Abelardo Vâzqüéz: sus años de formación en España, el recuento de su producción poética, su labor de promoción cultural a través de la revista Pámpano, su participación como libretista y organizador de la Fiesta de la Vendimia. El análisis de sus obras poéticas permite considerar el valor simbólico, de ciertos adjetivos, de las imágenes de la luz y la sombra. Asimismo, manifiesta el papel estético del uso recurrente de estructuras antitéticas y paralelísticas. Finalmente, se considera la gravitación de ciertos temas que ocupan un papel axial en su universo literario: el amor, el tiempo, la muerte.Fil: Pena, Raúl Fernando. Universidad Nacional de Cuy

Dissecting the ΔI=1/2\Delta I= 1/2 rule at large NcN_c

We study the scaling of kaon decay amplitudes with the number of colours, $N_c$, in a theory with four degenerate flavours, $N_f=4$. In this scenario, two current-current operators, $Q^\pm$, mediate $\Delta S=1$ transitions, such as the two isospin amplitudes of non-leptonic kaon decays for $K\to (\pi\pi)_{I=0,2}$, $A_0$ and $A_2$. In particular, we concentrate on the simpler $K\to\pi$ amplitudes, $A^\pm$, mediated by these two operators. A diagrammatic analysis of the large-$N_c$ scaling of these observables is presented, which demonstrates the anticorrelation of the leading ${\mathcal O}(1/N_c)$ and ${\mathcal O}(N_f/N_c^2)$ corrections in both amplitudes. Using our new $N_f=4$ and previous quenched data, we confirm this expectation and show that these corrections are $naturally$ large and may be at the origin of the $\Delta I=1/2$ rule. The evidence for the latter is indirect, based on the matching of the amplitudes to their prediction in Chiral Perturbation Theory, from which the LO low-energy couplings of the chiral weak Hamiltonian, $g^\pm$, can be determined. A NLO estimate of the $K \to (\pi\pi)_{I=0,2}$ isospin amplitudes can then be derived, which is in good agreement with the experimental value.Comment: 12 pages, 7 figures. Minor change

Clinical Manifestations and Diagnosis of Acromegaly

Acromegaly and gigantism are due to excess GH production, usually as a result of a pituitary adenoma. The incidence of acromegaly is 5 cases per million per year and the prevalence is 60 cases per million. Clinical manifestations in each patient depend on the levels of GH and IGF-I, age, tumor size, and the delay in diagnosis. Manifestations of acromegaly are varied and include acral and soft tissue overgrowth, joint pain, diabetes mellitus, hypertension, and heart and respiratory failure. Acromegaly is a disabling disease that is associated with increased morbidity and reduced life expectancy. The diagnosis is based primarily on clinical features and confirmed by measuring GH levels after oral glucose loading and the estimation of IGF-I. It has been suggested that the rate of mortality in patients with acromegaly is correlated with the degree of control of GH. Adequately treated, the relative mortality risk can be markedly reduced towards normal

Evaluation of a novel digital environment for learning medical parasitology.

open access articleEukaryotic parasites represent a serious human health threat requiring health professionals with parasitology skills to counteract this threat. However, recent surveys highlight an erosion of teaching of parasitology in medical and veterinary schools, despite reports of increasing instances of food and water borne parasitic infections. To address this we developed a web-based resource, DMU e-Parasitology®, to facilitate the teaching and learning of parasitology, comprising four sections: theoretical; virtual laboratory; virtual microscopy; virtual clinical case studies. Testing the package was performed using a questionnaire given to ninety-five Pharmacy students in 2017/18 to assess effectiveness of the package as a teaching and learning tool. 89.5% of students reported appropriate acquisition of knowledge of the pathology, prevention and treatment of some parasitic diseases. 82.1% also welcomed the clinical specialism of the package as it helped them to acquire basic diagnostic skills, through learning infective features/morphology of the parasites

Cardan angle rotation sequence effects on first-metatarsophalangeal joint kinematics: implications for measuring hallux valgus deformity

BACKGROUND: There currently are no recommended standards for reporting kinematics of the first-metatarsophalangeal joint. This study compared 2 different rotation sequences of Cardan angles, with implications for understanding the measurement of hallux valgus deformity. METHODS: Thirty-one women (19 hallux valgus; 12 controls) participated. All were scanned in an open-upright magnetic resonance scanner, their foot posed to simulate the gait conditions of midstance, heel-off, and terminal stance. Using computer processes, selected tarsals were reconstructed into virtual bone models and embedded with principal-axes coordinate systems, from which the rotation matrix between the hallux and first metatarsal was decomposed into Cardan angles. Joint angles were then compared using a within factors (rotation sequence and gait condition) repeated-measures analysis of variance (ANOVA). RESULTS: Only the transverse plane-first sequence consistently output incremental increases of dorsiflexion and abduction across gait events in both groups. There was an interaction (F ≥ 25.1; p < 0.001). Follow-up comparisons revealed angles were different (p < 0.05) at terminal stance. CONCLUSIONS: Different rotation sequences yield different results. Extracting the first rotation in the transverse plane allows for the resting alignment of the hallux to deviate from the sagittal plane. Therefore, representing first-metatarsophalangeal joint kinematics with the transverse plane-first rotation sequence may be preferred, especially in cases of hallux valgus deformity

Productividad, eficiencia y tecnologías de la información y de la comunicación: Aplicación empírica a la industria española

Este trabajo estudia la contribución de las tecnologías de la información y de la comunicación al crecimiento de la industria española, durante el periodo 1990-1999. Se aplica la descomposición del crecimiento de Solow (1957) y para el análisis de productividad se usa la metodología de fronteras estocásticas. Se encuentra que la mayor contribución es en la producción de las ramas TIC-manufacturas y éstas no tienen efectos spillover significativos. También se destaca el escaso efecto sobre la productividad del progreso técnico incorporado en capital físico.********************************************************************************************************We study the effect of the Information and Communication technologies on the Spanish Industry growth during 1990-1999. We use Solow (1957) approach and stochastical frontiers for measuring productivity. We find that the main contribution is in the production and there are no spillover effects. We also find a no-significative impact of the technical progress on capital.Information and Communication Technologies, productivity, stochastical frontiers, Spain

Photoconductivity and electrical transport properties in PbTe single quantum well samples

We investigated the photoconductivity effect in 10 and 14 nm well thickness n-type PbTe/Pb1xEuxTe quantum wells, with x values of 0.12 and 0.1, for a temperature range of 300–10K using infrared light. Also, magnetotransport properties measurements are performed in 8, 10, 15, 20 and 30 nm well width p-type PbTe/Pb0.9Eu0.1Te quantum wells, at magnetic fields up to 33 T and temperature varying from 0.35 to 300 K, under dark and illuminated condition. For the n-type PbTe quantum wells, the measurements revealed that at high temperatures, the photoresponse has small amplitude. As temperature decreases to T~75 K, the photoconductivity amplitude increases reaching a maximum value 10 times higher than the original value before illumination. From Hall measurements performed under dark and light conditions, we show that this effect is a result of carrier concentration increase under illumination. Unexpectedly, for further reduction of temperature, the amplitude starts to decrease again. The electrical resistance profiles indicate that the transport occurs through barriers and the well that behave as two parallel channels. For temperatures below 75K, transport is more effective in the quantum well, where the signal reduction can be associated with the electron-electron scattering due to the increase in the carrier concentration that occurs under illumination. We also used the random potential model to explain the origin of the persistent effect observed in the photoconductivity curves. We compare magnetotransport measurements in p-type PbTe/Pb0.9Eu0.1Te quantum wells with different widths: 10, 15 and 20 nm, revealing clearly QHE and SdH oscillations, which evidences the two-dimension electron gas formation and the high quality of the samples. The 10 nm well width presented odd non-integer filling factors sequence (2.3; 3.4; 5.6; 6.9 and 8.8). The non-integer values may be associated to edge states, since that parallel conduction in the interface, between the barrier and well, was not enhanced or destroyed by illumination, although the carrier concentration was enhanced. Further investigations are necessary to clarify this effect and we consider the approximated integers 2; 4; 6; 7 and 9 calculated from experimental B values. For the 15 and 20 nm QW thickness, the SdHO and QHE also appear, however, it reveals an even integer filling factors sequence. The 10 nm QW thickness odd sequence originated from the first sub-band Landau level spin splitting; according to the Fermi level compared to the longitudinal and transversal resistance together with the first longitudinal sub-band spin splitting simulation. This assumption VI agrees with the FFT analysis that reveals the main frequency peak and two other ones, which may be the second harmonic spin splitting, up and down. The same FFT profile appears for the other two samples. Nevertheless, the 8 and 30 nm well width sample presented an insulator profile behavior and neither SdHO nor QHE were present. It is probably because the indium contacts do not diffuse through the PbTe layer well