Radiation shielding properties of siderurgical aggregate concrete

ABSTRACT: The world is changing, and consequently so are policies on the use of natural resources. One of the most convenient ways to reduce the consumption of natural aggregates in the production of more sustainable construction materials is the use of recovered industrial by-products. In this study, concretes are designed using siderurgical aggregates from electric arc furnaces, taking advantage of their high density to use them as radiation shielding concrete. To verify the suitability of these aggregates, four concrete mixes were designed with different aggregates: limestone, siderurgical magnetite aggregates (the most commonly used in the nuclear field). The comparison of the different mixes was carried out focusing on the physical?mechanical properties in the field of ionizing radiation shielding (gamma radiation and neutron shielding) by means of simulations. In addition, an analysis was performed to establish how the w/c ratio and the amount of CEM affect shielding properties. In terms of linear attenuation coefficient and neutron transmission rate, the concrete with siderurgical aggregates shows intermediate capability in comparison with the limestone aggregate and magnetite concrete. The increase in the amount of cement and the w/c ratio caused a decrease in the linear attenuation coefficient and a reduction in the neutron transmission rate, but the variation in the w/c ratio did not have a significant impact on the neutron transmission rate.This research was co-financed by the European Regional Development Fund (ERDF) and the Ministry of Economy, Industry and Competitiveness (MINECO) within the framework of the project RTC2016-5637-3. The research has been possible thanks to the collaboration of the company INGECID, the department LADICIM (University of Cantabria) the Modern Physics Department of the University of Cantabria and the companies ROCACERO and SIDENOR

Population genomics applications for conservation: the case of the tropical dry forest dweller Peromyscus melanophrys

Recent advances in genomic sequencing have opened new horizons in the study of population genetics and evolution in non-model organisms. However, very few population genomic studies have been performed on wild mammals to understand how the landscape affects the genetic structure of populations, useful information for the conservation of biodiversity. Here, we applied a genomic approach to evaluate the relationship between habitat features and genetic patterns at spatial and temporal scales in an endangered ecosystem, the Tropical Dry Forest (TDF). We studied populations of the Plateau deer mouse Peromyscus melanophrys to analyse its genomic diversity and structure in a TDF protected area in the Huautla Mountain Range (HMR), Mexico based on 8,209 SNPs obtained through Genotyping-by-Sequencing. At a spatial scale, we found a significant signature of isolation-by-distance, few significant differences in genetic diversity indices among study sites, and no significant differences between habitats with different levels of human perturbation. At a temporal scale, while genetic diversity levels fluctuated significantly over time, neither seasonality nor disturbance levels had a significant effect. Also, outlier analysis revealed loci potentially under selection. Our results suggest that the population genetics of P. melanophrys may be little impacted by anthropogenic disturbances, or by natural spatial and temporal habitat heterogeneity in our study area. The genome-wide approach adopted here provides data of value for conservation planning, and a baseline to be used as a reference for future studies on the effects of habitat fragmentation and seasonality in the HMR and in TDF

A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)

Meeting abstrac

High genetic structure of the Cozumel Harvest mice, a critically endangered island endemic : conservation implications

E. Vazquez-Domınguez acknowledges financial support from the Instituto de Ecologıa, UNAM, from Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (grants IX238004, IN217910 and IN219707) and from Consejo Nacional de Ciencia y Tecnologıa (CONACyT grant 101861). S. Espindola acknowledges the scholarship and financial support provided by CONACyT (No. 245447). Scientific collector permit to E.V.D.: Semarnat-FAUT-0168.We assessed the genetic structure and diversity of Reithrodontomys spectabilis, a critically endangered, endemic rodent from Cozumel Island, México. A total of 90 individuals were trapped from September 2001 to January 2005. Microsatellite data analysis revealed high genetic diversity values: a total of 113 alleles (average 12.5 per locus), H0 = 0.78, He = 0.80. These high values can be related to Cozumel's size (478 km2) and extensive native vegetation cover, factors that could be promoting a suitable population size, high heterozygosity and the persistence of rare alleles in the species, as well as some long-term movement of individuals between sampling localities. A strong genetic structure was also observed, with at least four genetic groups, associated with a pattern of isolation by distance. We found a strong allelic and genetic differentiation shown between localities, with negligible recent gene flow and low inbreeding coefficients. The species life history and ecological characteristics-being nocturnal, semi-terrestrial, a good tree climber, having lunar phobia and significant edge effect-are likely affecting its genetic structure and differentiation. The high genetic diversity and population structure award R. spectabilis a significant conservation value. Our results can serve as a basis for future research and conservation of the species, particularly considering the problems the island is facing from habitat perturbation, urbanization and introduction of exotic species. In view of the structure and genetic variability observed, it is essential to establish and reinforce protected areas and management programs for the conservation of the endemic and endangered Cozumel Harvest mice.PostprintPeer reviewe

Sustainable Amazonian Landcapes, Colombia socioeconomic survey

The household survey was done in the four municipalities that are part of two landscape units from 30 March 2016 to 3 October 2016. A total of 341 households were surveyed, of which 176 (51, 6%) were from UP4 (hill) and 165 (48, 4%) from UP6 (mountainous). All the households that participated in the survey did it freely and under prior informed consent. Sampling was stratify across the two landscape units in order to take into account the different land use that farmers give to the land according to the biophysics conditions of its land. The data was collected through Android Devices using the software CsPro, and the data analysis was done through the statistical software package Stata (Reporte Interno: Linea Base Encuesta Socioeconomica Proyecto SAL, 2018). (2016

Sustainable Amazonian Landcapes, Colombia socioeconomic survey

The household survey was done in the four municipalities that are part of two landscape units from 30 March 2016 to 3 October 2016. A total of 341 households were surveyed, of which 176 (51, 6%) were from UP4 (hill) and 165 (48, 4%) from UP6 (mountainous). All the households that participated in the survey did it freely and under prior informed consent. Sampling was stratify across the two landscape units in order to take into account the different land use that farmers give to the land according to the biophysics conditions of its land. The data was collected through Android Devices using the software CsPro, and the data analysis was done through the statistical software package Stata (Reporte Interno: Linea Base Encuesta Socioeconomica Proyecto SAL, 2018)