Few-body decay and recombination in nuclear astrophysics

Three-body continuum problems are investigated for light nuclei of astrophysical relevance. We focus on three-body decays of resonances or recombination via resonances or the continuum background. The concepts of widths, decay mechanisms and dynamic evolution are discussed. We also discuss results for the triple $\alpha$ decay in connection with $2^+$ resonances and density and temperature dependence rates of recombination into light nuclei from $\alpha$-particles and neutrons.Comment: 9 pages, 8 figures. Proceedings of the 21st European Few Body Conference held in Salamanca (Spain) in August-September 201

A SENSITIVITY ANALYSIS OF ORGANIC VERSUS CONVENTIONAL SYSTEMS OF SHEEP-FARMING

In the Mediterranean Agriculture, the organic production constitutes a real possibility for sustainable development, it can keep a population in these areas and provide it with a decent work. This paper try to establish differences between conventional and organic systems of production, so that observation of these differences would lead to conclusions relating to the level of efficiency of one system as against the other. To achieve this objective, the research team analyzed the evolution of seventeen milk sheep farms in various places in the Castilla y León Region for a whole year. The study consisted in the modeling of the results of a Cobb-Douglas production function. The findings reveal that organic farms have higher production levels with the same combination of inputs. This result is a guarantee of future for this type of production and guarantee of feasibility for these areas

Decay of low-lying 12C resonances within a 3alpha cluster model

We compute energy distributions of three $\alpha$-particles emerging from the decay of $^{12}$C resonances by means of the hyperspherical adiabatic expansion method combined with complex scaling. The large distance continuum properties of the wave functions are crucial and must be accurately calculated. The substantial changes from small to large distances determine the decay mechanisms. We illustrate by computing the energy distributions from decays of the $1^{+}$ and $3^-$-resonances in $^{12}$C. These states are dominated by direct and sequential decays into the three-body continuum respectively.Comment: 5 pages, 3 figures. Proceedings of the Clusters '07 conference held in Stratford-upon-Avon in September 200

Control of trace metal distribution and variability in an interdunal wetland

Trace elements are serious pollutants in the natural environment and are of increasing concern due to the adverse effects at global scale. To refine the current understanding of trace metal distribution and variability in natural environments, concentrations of dissolved trace metals (Ag, Al, As, B, Ba, Be, Co, Cr, Cd, Cu, Fe, Hg, Mo, Ni, Pb, Sb, Se, Th,Tl, U, V, Mn, Zn), major ions, inorganic nutrients (NO3, PO4), TOC and stable isotopes of water were determined in water samples from rainwater, seven piezometers and a pond in the coastal Doñana wetland during four sampling campaigns between 2017 and 2019. Results show clear evaporation signatures of stable isotopes in the pond but not in the groundwater. Hydrochemical analyses yield significant, systematic changes in groundwater trace metal and nutrient composition along the flowpath from the dune belt to the pond, controlled by organic matter in the sediments. Whereas major ions reached maximum concentrations in the pond due to evapoconcentration, most trace metals showed highest concentrations at sites with lower redox levels, except for B, As and U, which showed very high concentrations in the pond. Cu, Zn, Ni, Sb and Tl yielded higher median concentrations in rainwater than in most of the groundwater points and in case of Cu and Zn higher even than in surface water which points to an atmospheric input source of these elements. Temporal variability of trace metals was related to lower hydraulic heads after an elongated dry period which led to lower redox levels and higher concentrations of most of the trace elements whereas major ions showed more constant concentration levels. This is of special concern regarding climate change and the predicted higher frequency of prolonged dry periods, which could modify the natural hydrochemical patterns in undisturbed wetlands systemsThis work has been financed by the CLIGRO Project (MICINN, CGL2016-77473-C3-1-R) of the Spanish National Plan for Scientific and Technical Research and Innovation. The infrastructure has been cofinanced by European Research Funds (SE Scientific Infrastructures and Techniques and Equipment 388 2013, IGME13-1E-2113). We are especially grateful for the technical support of Lidia Molano Leno and Daniel Jesus Martinez Suárez. The contracts of Lidia Molano Leno (PEJ-2014-A-68763) and Daniel Jesus Martinez Suárez (PTA2014-09579-I) were financed by the Ministry of Economy, Industry and Competitiveness of Spain (MINECO) and co-financed by the European Investment Bank (EIB) and the European Social Fund (ESF). The contract of Carmen Serrano Hidalgo was funded by the Industrial PhD grant supported by the Autonomous Region of Madrid, Spain (IND2018/AMB-9553). This work is also a contribution to the Andalusian research groups RNM-308 (Group of Hydrogeology) and RNM-126 (Group of water resources), the Lower Guadalquivir Basin convention between the CN IGME CSIC and Confederación Hidrológica del Guadalquivir (CHG) as well as the convention between Pablo de Olavide University and the Guadalquivir River Basin Board (Hydrological monitoring and modeling in Doñana temporary ponds

Secuestro de C en plantaciones de Eucalyptus spp establecidas en terrenos agrícolas en el norte de España

Una de las estrategias que se ha planteado para fijar gases con efecto invernadero (CO2, CH4 y N2O) es el aumento de la superficie forestal. España es uno de los países que más han contribuido a incrementar la superficie forestal en Europa, lo que se debe en buena parte al establecimiento de parcelas en tierras agrarias en situación de marginalidad. Durante el período de 11 años, transcurridos entre el segundo y el tercer inventarios forestales (1987 y 1998), el almacenamiento de C en biomasa arbórea en el norte de España ha aumentado en un 50 %. En este trabajo se realiza una primera estimación de las ganancias de C en biomasa y suelo en plantaciones de eucalipto establecidas en terrenos agrícolas. Para ello se seleccionaron un total de 25 pares de parcelas. Se trata de parcelas agrarias en las cuales parte de la superficie se transformó a plantación de Eucalyptus sp. En estas parcelas se determinó la acumulación de C en biomasa arbórea, mantillo y suelo en tres profundidades 0-5, 5-15 y 15-30 cm. Dado las mejores condiciones de fertilidad y mayor profundidad, que promueven el crecimiento arbóreo, la tasa de acumulación de C en biomasa es considerablemente superior a las plantaciones establecidas en suelos forestales. Los datos de este trabajo muestran acumulaciones superiores a 17 Mg ha-1 año-1. La acumulación de C en el mantillo también es superior a 1 Mg ha-1 año-1. En cuanto al suelo mineral, las pérdidas de C se reducen con los años desde el cambio de uso, fundamentalmente a partir de los 15 años del establecimiento y en plantaciones sobre esquistos y pizarras. Hasta ese momento se produjeron ligeras pérdidas.____________________________________One of the strategies proposed for fixing gases that contribute to the greenhouse effect (CO2, CH4 and N2O) is to increase the extension of land covered by forest. Spain is one of the countries that has contributed most to the increase in the forest area in Europe, largely due to the establishment of forest plots on marginal agricultural land. During the 11- year period between the second and third forest inventories (1987 and 1998), there has been a 50% increase in the storage of C in tree biomass in northern Spain. In the present study, a first estimate was made of the increase in C in biomass and soil in eucalyptus plantations established on agricultural land. A total of 25 pairs of plots were selected for the study. The plots are on agricultural land, part of which has been transformed by plantation of Eucalyptus sp. The amount of C accumulated in the tree biomass, humus and three different depths of soil (0-5, 5-15 and 15-30 cm) was determined. Given the more fertile conditions and the greater depth of the soil, which favour tree growth, the rate of accumulation of C in the biomass was considerably higher than in plantations established on forest soils. The data obtained in the present study revealed accumulations of C of more than 17 Mg ha-1 year-1. Accumulation of C in the humus was also higher than 1 Mg ha-1 year-1. The losses of C in the mineral soil decreased since the change in land use, generally from 15 years after establishment onwards, and in plantations on schists and slates. Slight losses of C were observed up until this time

Application of satellite images to locate and inventory vineyards in the designation of origin "Bierzo" in Spain

P. 277-290With a view to contributing to the improvement of the current vineyard registers, this study presents a methodology for vineyard mapping based on satellite remote sensing systems. The procedure was validated for the Designation of origin "Bierzo" in Spain. Different supervised classifications were performed besed on two Landsat images acquired in the same year. The objetives of the present study were to determine which classification yielded the best results and to quantify the influence of different factors that affected the overall classification accuracy, such as the resampling method, the use of georeferenced mosaics, or the combination of the two imagesS

Bootstrap-based procedures for inference in nonparametric receiver-operating characteristic curve regression analysis

Prior to using a diagnostic test in a routine clinical setting, the rigorous evaluation of its diagnostic accuracy is essential. The receiver-operating characteristic curve is the measure of accuracy most widely used for continuous diagnostic tests. However, the possible impact of extra information about the patient (or even the environment) on diagnostic accuracy also needs to be assessed. In this paper, we focus on an estimator for the covariate-specific receiver-operating characteristic curve based on direct regression modelling and nonparametric smoothing techniques. This approach defines the class of generalised additive models for the receiver-operating characteristic curve. The main aim of the paper is to offer new inferential procedures for testing the effect of covariates on the conditional receiver-operating characteristic curve within the above-mentioned class. Specifically, two different bootstrap-based tests are suggested to check (a) the possible effect of continuous covariates on the receiver-operating characteristic curve and (b) the presence of factor-by-curve interaction terms. The validity of the proposed bootstrap-based procedures is supported by simulations. To facilitate the application of these new procedures in practice, an R-package, known as npROCRegression, is provided and briefly described. Finally, data derived from a computer-aided diagnostic system for the automatic detection of tumour masses in breast cancer is analyse

Bootstrap-based procedures for inference in nonparametric ROC regression analysis

Before the use of a diagnostic test in a routine clinical setting, the rigorous evaluation of its diagnostic accuracy is an essential step. The receiver operating characteristic (ROC) curve is the measure of accuracy most widely used for continuous diagnostic tests. However, the possible impact of extra information about the patient (or even the environment) on diagnostic accuracy needs to be also assessed. In this paper, attention is focused on an estimator for the covariate-specific ROC curve based on direct regression modelling and nonparametric smoothing techniques. This approach defines the class of generalized additive models for the ROC curve (ROC-GAM). The main aim of the paper is to offer new inferential procedures for testing the effect of co- variates over the conditional ROC curve within the ROC-GAM context. Specifically, two different bootstrap-based tests are suggested to check (a) the possible effect of continuous covariates on the ROC curve; and (b) the presence of factor-by-curve interaction terms. The validity of the proposed bootstrap-based procedures is supported by simulations. To facilitate the application of these new procedures in practice, an R-package, known as npROCRegression, is provided and briefly described. Finally, data derived from a computed-aided diagnostic (CAD) system for the automatic detection of tumour masses in breast cancer is analysed

Restauración de la Casa Museo Manuel María Aguilera Patiño por parte de entidades sin fines de lucro

Objetivos generales 1. Lograr la restauración de la Casa Museo 2. Resaltar el valor histórico que posee el inmueble al igual que la importancia que tiene este museo para incrementar el turismo en el distrito de Antón 3. Contribuir a la divulgación de las tradiciones del pueblo antonero y su legado a la fe cristiana bajo la devoción del Santo Cristo de Esquipulas 4. Promover turísticamente al Distrito de Antón e incluirlo dentro de los archivos turísticos de la provincia de Coclé. 5. Mantener vínculos permanentes con las Instituciones Nacionales e Internacionales encargadas de dicha restauración 6. Incrementar de la economía del distrito de Antón 7. Fomentar el interés por el rescate de las tradiciones folklóricas, leyendas, danzas, festividades, gastronomía, etc. 8. Contribuir a encauzar las actividades interdisciplinarias a lo largo del proceso de ejecución del anteproyecto de restauración 9. Contribuir a homologar los niveles de calidad de anteproyecto de restauración presentados en esta investigación. 10. Coadyubar con las autoridades correspondientes para el rescate del patrimonio del Distrito de Antón Objetivos Específicos 1. Diseñar instrumentos de evaluación, análisis y controles del proyecto de restauración para la Casa Museo Manuel María Aguilera Patiño, y que sean de aplicación nacional 2. Aplicar tales instrumentos a un proyecto de restauración, en este caso la Casa de Museo 3. Establecer un formato de presentación para toda la información suministrada por lo

Direct and sequential radiative three-body reaction rates at low temperatures

We investigate the low-temperature reaction rates for radiative capture processes of three particles. We compare direct and sequential capture mechanisms and rates using realistic phenomenological parametrizations of the corresponding photodissociation cross sections.Energy conservation prohibits sequential capture for energies smaller than that of the intermediate two-body structure. A finite width or a finite temperature allows this capture mechanism. We study generic effects of positions and widths of two- and three-body resonances for very low temperatures. We focus on nuclear reactions relevant for astrophysics, and we illustrate with realistic estimates for the $\alpha$-$\alpha$-$\alpha$ and $\alpha$-$\alpha$-$n$ radiative capture processes. The direct capture mechanism leads to reaction rates which for temperatures smaller than 0.1 GK can be several orders of magnitude larger than those of the NACRE compilation.Comment: To be published in European Physical Journal