On the mass assembly of low-mass galaxies in hydrodynamical simulations of structure formation

Cosmological hydrodynamical simulations are studied in order to analyse generic trends for the stellar, baryonic and halo mass assembly of low-mass galaxies (M_* < 3 x 10^10 M_sun) as a function of their present halo mass, in the context of the Lambda-CDM scenario and common subgrid physics schemes. We obtain that smaller galaxies exhibit higher specific star formation rates and higher gas fractions. Although these trends are in rough agreement with observations, the absolute values of these quantities tend to be lower than observed ones since z~2. The simulated galaxy stellar mass fraction increases with halo mass, consistently with semi-empirical inferences. However, the predicted correlation between them shows negligible variations up to high z, while these inferences seem to indicate some evolution. The hot gas mass in z=0 halos is higher than the central galaxy mass by a factor of ~1-1.5 and this factor increases up to ~5-7 at z~2 for the smallest galaxies. The stellar, baryonic and halo evolutionary tracks of simulated galaxies show that smaller galaxies tend to delay their baryonic and stellar mass assembly with respect to the halo one. The Supernova feedback treatment included in this model plays a key role on this behaviour albeit the trend is still weaker than the one inferred from observations. At z>2, the overall properties of simulated galaxies are not in large disagreement with those derived from observations.Comment: 19 pages, 12 figures. Accepted for publication in MNRAS: 6th August 2013. First submitted: 7th July 201

Origin of superimposed and curved slickenlines in San Miguelito range, Central México

Interactions between intersecting faults cause local perturbations of the stress field in the vicinity of their intersections. Fault intersections are places of stress accumulation, stress relief and refraction of the stress trajectories; the slip vectors near these intersections are deviated from the maximum shear stress resolved by the far-field stress. In an intersecting fault system, superimposed, arc-shaped and zigzag slickenlines can be formed due to interaction between intersecting faults. We propose some mechanisms in which it is possible to recognize that the superimposed and curved slickenlines are produced from curvilinear translational fault motion. The geometrical models presented in this contribution are consistent with the slickenlines distribution observed in the vicinity of intersection lines, measured in the San Miguelito range, Mesa Central, México. Two tectonic phases have been inferred from our slip vector models near the intersection lines, which is consistent with observations of previously published work

Origin of superimposed and curved slickenlines in San Miguelito range, Central México

Interactions between intersecting faults cause local perturbations of the stress field in the vicinity of their intersections. Fault intersections are places of stress accumulation, stress relief and refraction of the stress trajectories; the slip vectors near these intersections are deviated from the maximum shear stress resolved by the far-field stress. In an intersecting fault system, superimposed, arc-shaped and zigzag slickenlines can be formed due to interaction between intersecting faults. We propose some mechanisms in which it is possible to recognize that the superimposed and curved slickenlines are produced from curvilinear translational fault motion. The geometrical models presented in this contribution are consistent with the slickenlines distribution observed in the vicinity of intersection lines, measured in the San Miguelito range, Mesa Central, México. Two tectonic phases have been inferred from our slip vector models near the intersection lines, which is consistent with observations of previously published work

Artículos publicados en el diario El País sobre Antonio Fernández Alba

Artículos publicados sobre Antonio Fernández Alba en el diario El Paí

Aplicación NIC 41 en la producción de caña de azúcar de la parroquia Ayapamba, cantón Atahualpa

Ecuador is a country of great ecosystem wealth, which has benefited the development of the productive sector, presenting various types of crops important in the economic growth of the country, being important to provide reliable and real financial information of the producing companies. The cultivation of sugarcane is a production of internal satisfaction, intended for consumption or preparation of derived products. In the Ayapamba parish, Atahualpa canton, it corresponds to the third crop that occupies the largest area, dominated by small producers whose empirical knowledge causes disloyal and inaccurate information. In this context, it is necessary to analyze the applicability of IAS 41 in the production of sugarcane in the parish, focused on knowing the importance that the regulations would have in the production process. The research was developed under a qualitative approach, and a descriptive - non-experimental design during the 2022 period, using a bibliographic collection corresponding to the implementation of IAS 41 in different sectors and its results. At the end, it was obtained that the regulations will cause a better control management of the information of the productive process, without greatly influencing the fair value of the asset, due to the state and valuation of the asset by the market.El Ecuador es un país de gran riqueza ecosistémica, lo cual ha beneficiado al desarrollo del sector productivo, presentando diversos tipos de cultivo importantes en el crecimiento económico del país, siendo importante brindar la información financiera fiable y real de las empresas productoras. El cultivo de caña de azúcar es una producción de satisfacción interna, destinada al consumo o preparación de productos derivados. En la parroquia Ayapamba, cantón Atahualpa corresponde al tercer cultivo que mayor superficie ocupa, dominada por pequeños productores cuyo conocimiento empírico ocasiona información desleal, e inexacta. En este contexto es preciso analizar la aplicabilidad de la NIC 41 en la producción de caña de azúcar de la parroquia, enfocado en conocer la importancia que tendría la normativa en el proceso productivo. La investigación se desarrolló bajo un enfoque cuantitativo, y un diseño descriptivo - no experimental durante el período 2022, utilizando una recolección bibliográfica correspondiente a la implementación de la NIC 41 en distintos sectores y sus resultados. Al finalizar, se obtuvo que la normativa, ocasionará una mejor gestión de control de la información del proceso productivo, sin influir de gran manera en el valor razonable del activo, debido al estado y valoración del activo por parte del mercado

Healthcare workers hospitalized due to COVID-19 have no higher risk of death than general population. Data from the Spanish SEMI-COVID-19 Registry

Aim To determine whether healthcare workers (HCW) hospitalized in Spain due to COVID-19 have a worse prognosis than non-healthcare workers (NHCW). Methods Observational cohort study based on the SEMI-COVID-19 Registry, a nationwide registry that collects sociodemographic, clinical, laboratory, and treatment data on patients hospitalised with COVID-19 in Spain. Patients aged 20-65 years were selected. A multivariate logistic regression model was performed to identify factors associated with mortality. Results As of 22 May 2020, 4393 patients were included, of whom 419 (9.5%) were HCW. Median (interquartile range) age of HCW was 52 (15) years and 62.4% were women. Prevalence of comorbidities and severe radiological findings upon admission were less frequent in HCW. There were no difference in need of respiratory support and admission to intensive care unit, but occurrence of sepsis and in-hospital mortality was lower in HCW (1.7% vs. 3.9%; p = 0.024 and 0.7% vs. 4.8%; p<0.001 respectively). Age, male sex and comorbidity, were independently associated with higher in-hospital mortality and healthcare working with lower mortality (OR 0.211, 95%CI 0.067-0.667, p = 0.008). 30-days survival was higher in HCW (0.968 vs. 0.851 p<0.001). Conclusions Hospitalized COVID-19 HCW had fewer comorbidities and a better prognosis than NHCW. Our results suggest that professional exposure to COVID-19 in HCW does not carry more clinical severity nor mortality