1,496 research outputs found

    Localization of fermions in different domain wall models

    Full text link
    Localization of fermions is studied in different gravitational domain wall models. These are generalizations of the brane-world models considered by Randall and Sundrum, but which also allow gravitational localization. Therefore, they might be considered as possible realistic scenarios for phenomenology.Comment: RevTeX, 6 pages, 10 figure

    Resilience and performance of wine cooperatives in Castilla La-Mancha (Spain) during a period of financial crisis

    Get PDF
    The economic crisis has had an asymmetric effect on Spanish and regional/local economies. This study aims to analyze the strategies developed by cooperative wineries in Castilla-La Mancha (CLM) and their impact on performance measurements. The paper opted for an exploratory study based on a compilation of financial statements consisting of the traditional economic-financial profitability ratios (ROA, ROI, ROS) plus a specific analysis, Return of Owner Cooperative (ROC). We have also used two financial measurements: Liquidity and Leverage. Trade dynamism is the hallmark of wine cooperatives in CLM in terms of strategic action in the face of a crisis. Their resilience is patent in the conquest of foreign markets via low unit costs, which have been transferred to sales prices. The paper has implications for the understanding of the resilience of the agricultural cooperatives during the crisis period in question. The consistency of the results provides a context to promote the cooperative model as an essential factor in the social economy. This paper fulfils an identified need to show the cooperative model as a resilient one in the agricultural field and in the context of rural development. Highlights: Cooperative wineries contribute to economic and social development in Castilla La Mancha (Spain). Social economy companies withstood the crisis better due to their objective function (maximizing cooperative owners’ income) and thanks to their flexibility in terms of grape payment policies. The Return of Owner Cooperative (ROC) measures the transfer of income to farmers and is higher than the payment they would receive from other agents. The cooperative wineries have reacted to the crisis with good financial indicators: liquidity and leverage. The cooperative wineries have adopted a strategy based on exports that has allowed them to overcome the economic crisis.The economic crisis has had an asymmetric effect on Spanish and regional/local economies. This study aims to analyze the strategies developed by cooperative wineries in Castilla-La Mancha (CLM) and their impact on performance measurements. The paper opted for an exploratory study based on a compilation of financial statements consisting of the traditional economic-financial profitability ratios (ROA, ROI, ROS) plus a specific analysis, Return of Owner Cooperative (ROC). We have also used two financial measurements: Liquidity and Leverage. Trade dynamism is the hallmark of wine cooperatives in CLM in terms of strategic action in the face of a crisis. Their resilience is patent in the conquest of foreign markets via low unit costs, which have been transferred to sales prices. The paper has implications for the understanding of the resilience of the agricultural cooperatives during the crisis period in question. The consistency of the results provides a context to promote the cooperative model as an essential factor in the social economy. This paper fulfils an identified need to show the cooperative model as a resilient one in the agricultural field and in the context of rural development. Highlights: Cooperative wineries contribute to economic and social development in Castilla La Mancha (Spain). Social economy companies withstood the crisis better due to their objective function (maximizing cooperative owners’ income) and thanks to their flexibility in terms of grape payment policies. The Return of Owner Cooperative (ROC) measures the transfer of income to farmers and is higher than the payment they would receive from other agents. The cooperative wineries have reacted to the crisis with good financial indicators: liquidity and leverage. The cooperative wineries have adopted a strategy based on exports that has allowed them to overcome the economic crisis

    Multi-scale habitat selection of land cover proportion by farmland birds in Ontario

    Get PDF
    Modern agriculture is a central driver in species declines, and its harmonization with conservation is critical to achieving social and ecological sustainability. Due to agricultural land occupation and reduction of native vegetation covers, species like migratory birds use remaining habitats within agricultural landscapes to complete their life cycles. The consequent decrease in vital ecosystem functions linked to biodiversity (e.g., pollination, pest control) has prompted scientists and land managers to design strategies that benefit production and conservation. However, variation in species' perception of landscape fragmentation across agricultural areas makes difficult the delineation of favourable landscape attributes in agricultural systems. Species can interact with environmental factors at varying spatial and temporal scales, with highly context-dependent outcomes. Here, I aim to quantify farmland birds' selection of home range’s location (i.e., Second order selection) based on the proportion of six land covers (Tame grass, Native grass, Trees, Shrubs, Developed) measured at five spatial scales of varying extent: 200m, 400m, 800m, 1600m and 3200m radii. I address the questions 1) Do farmland birds in Southern Ontario select land cover proportion in the local landscape as a habitat cue? 2) Do scales selected by farmland birds in the local landscape differ according to their degree of specialization? And 3) How is the distribution of farmland birds that use local-landscape cover proportion as a habitat cue in Ontario? Using bird occurrence data from North America's Breeding Birds Surveys (BBS) between 2014 and 2019 and landcover data from Ontario's Annual crop inventory (ACI), Resource Selection Functions (RSF) were built for farmland birds in Ontario. I applied a semi-optimized modelling approach to determine the scales within farmland birds' perceived changes in land cover proportion and composition, making inferences on their plausible causes and management implications. Results indicate that multiple species select or avoid habitats using landscape-level cues at varying scales below 800m and above 1600m radii. Farmland birds' multi-scale selection also seems to differ between generalists and specialists, with specialists selecting landcover proportion at smaller scales (i.e., >800m radii) and generalists at both smaller and large scales (1600m radii). These patterns contrasted with species preferences indicated that selection for landcover proportion at scales below the 800m radius could be associated with patch-level attributes and above the 1600m radius with landscape-level attributes. Moreover, prediction surfaces built from species top models showed that highly selected locations for farmland generalists and specialists concentrated between Western and Central Ontario were larger grasslands and varying landscape composition favour specialist and generalist occurrence. However, the extension of areas where multiple species concur on their occurrence was low compared to groups' mean occurrence, implying that there is not an exclusive landscape structure that favours all species. In order to improve the availability of attractive habitats for farmland birds, I suggest that rather than defining a top landscape structure, scientists and managers need to work together to determine multiple landscape arrangements adjusted to the availability of relevant factors like grassland proportion

    El lenguaje de los media, una opci?n para implementar la capacidad lexica-ling??stica

    Get PDF
    126 p. Recurso Electr?nico?El lenguaje de los media, una opci?n para incrementar la capacidad l?xica - ling??stica. Un estudio de comprensi?n sobre fen?menos orales en el territorio escolar desde el proceso etnometodol?gico con estudiantes de segundo del Colegio Esp?ritu Santo Marianistas?, hace parte del trabajo que desarrolla el Semillero Lenguaje y Territorio Escolar. La investigaci?n toma la etnometodolog?a para describir y comprender los fen?menos orales que circulan en el territorio escolar, y a partir de ello, se realizara una propuesta pedag?gica y did?ctica para ampliar la capacidad l?xica ? ling??stica desde el lenguaje mediatizado, donde los mass media se constituyen en una parte importante de nuestra sociedad, de la informaci?n, del ocio, y como reflejo del mundo en el que vivimos. Las representaciones sociales se asumen como un tipo de conocimiento para interpretar comportamientos humanos en un espacio particular, permite hacer presente en la mente hechos de la vida cotidiana. La cultura escolar, es din?mica, construida desde la cotidianidad; trasciende el aula de clases y el contexto. La territorialidad se relaciona con lo espacial-temporal, lo material, lo simb?lico, las din?micas y relaciones sociales territoriales. Aqu? se hace referencia a la producci?n textual de los estudiantes y a la capacidad de preparaci?n en el discurso oral; en general, el desarrollo y fortalecimiento de las habilidades comunicativas que permitan superar dificultades en los comportamientos del habla dentro del contexto escolar. Las escuelas no reconocen sus espacios como parte de un territorio, excepto cuando se trata de malas noticias. Por lo tanto es pertinente investigar ?C?mo operan en la pr?ctica cotidiana, las diferentes representaciones sociales que se constituyen en un escenario de cultura escolar y c?mo los procesos sociales generan a su vez las territorialidades de la escuela y la construcci?n de comunidad educativa? El colegio, ofrece variedad de escenarios, con posibilidad para recrear diferentes acciones que potencialicen el conocimiento del ni?o. A pesar de esto, se encontr? con que la mayor parte del tiempo, los ni?os poco acceso tienen a estos lugares y posiblemente el uso inadecuado de algunas palabras, sea la respuesta a ese estado de quietud; teniendo en cuenta que son ni?os muy peque?os y requieren de variedad no solo en estrategias pedag?gicas sino en lugares que propicien su conocimiento. Se observa entonces que son muchos los ni?os que poseen aparatos electr?nicos que desde casa no son supervisados a la hora de utilizarlos y es all? cuando acceden a contenidos, quiz?, poco apropiados donde su lenguaje no cumple con las expectativas para su corta edad. Este proyecto aplica una serie de herramientas que evidenciaron el siguiente problema: ?C?mo interpretar fen?menos orales en el territorio escolar del Colegio ESP?RITU SANTO MARIANISTAS de Girardot desde el proceso etnometodol?gico para aumentar la capacidad del vocabulario y la fluidez ling??stica de los estudiantes del grado segundo? La investigaci?n es una mirada a la escuela desde el estudio etnometodol?gico para comprender y aportar a la comprensi?n de los fen?menos orales. En el ejercicio investigativo se busca develar la realidad aparente y as? fortalecer los procesos pedag?gicos con la participaci?n activa de los estamentos educativos en la cotidianidad escolar. El territorio de observaci?n y de proyecci?n fue el Colegio Esp?ritu Santo Marianistas del municipio de Girardot, Colombia, A?o 2012-2014, y se cont? con el apoyo de los estudiantes del grado 2?; y el aporte del semillero de Investigaci?n Lenguaje y Territorio Escolar."The language of the media, an option to increase vocabulary skills - language. A study of oral understanding phenomena in the school grounds from the ethnomethodological process with second graders from Esp?ritu Santo Marianistas School, "is part of the work that the Seed School Language and Territory. The research takes ethnomethodology to describe and understand the oral phenomena circulating in the school grounds, and from this, a pedagogical and didactic proposal to extend the vocabulary skills is conduct - language from the mediated language, where the mass media constitute an important part of our society, information, entertainment, and as a reflection of the world in which we live. Social representations are assumed to be a kind of knowledge to interpret human behavior in a particular space, allows this in mind facts of everyday life. The school culture is dynamic, built from everyday life; transcends the classroom and context. Territoriality is related to the spatial-temporal, material, symbolic, territorial dynamics and social relations. This reference to the textual production of students and preparedness capabilities in oral discourse is; in general, the development and strengthening of communication skills to overcome difficulties in speech behavior within the school context. Schools do not recognize their spaces as part of a territory, except when it comes to bad news. Therefore it is pertinent to investigate How operate in everyday practice, different social representations that constitute a scenario of school culture and how social processes generate turn territorialities school and school community building? The school offers a variety of scenarios, with the possibility to recreate different actions potentializing the child's knowledge. Despite this, he found that most of the time, children have little access to these places and possibly improper use of certain words, it is the response to that state of stillness; considering that children are very small and require not only variety in teaching strategies but in places that foster knowledge. Is then observed that many children have at home electronics that are not supervised when using them and that is when accessing content, perhaps unsuitable where language does not meet the expectations for his young age. This project uses a number of tools that showed the following problem: How to interpret oral phenomena in the school territory of the Esp?ritu Santo Marianistas Girardot College from ethnomethodological process to increase the ability of vocabulary and language proficiency of second graders? The research is a look at the school from the ethnomethodological study to understand and contribute to the understanding of oral phenomena. The research is being made to unravel the apparent reality and thus strengthen the educational process with the active participation of the educational institutions in school every day. The territory of observation and projection was the Esp?ritu Santo Marianistas College Township Girardot, Colombia, Year 2012-2014, and had the support of the 2nd graders; and the contribution of seedlings Language School Research and Planning

    Direct and indirect effects of climate and vegetation on sheep production across Patagonian rangelands (Argentina)

    Get PDF
    Extensive sheep production is an important agricultural industry in the Patagonia region of Argentina, where the most important production metric is the effective lambing rate of the sheep (L%). Climate factors can affect sheep production in two ways: (i) directly on the survival of the lamb, and (ii) indirectly by determining the start of the growing season, aboveground net primary productivity (ANPP) and the availability of forage. The aim of this study was to determine the relationships between climatic variables and vegetation attributes as the major drivers of sheep productivity (ewe live weight pre-mating (ELW) and effective lambing rate (L%)), using structural equation modelling. We observed that precipitation in late autumn/winter and vegetation productivity in late spring/summer were the main drivers and were positively associated with ELW. The ELW was highly and positively correlated with L%. Additionally, the maximum temperature in late spring showed a strong direct and negative relationship with L%. These results indicated that ELW should be taken into account when modelling L%. Regional Patagonian climate change models predict, for the next century a decrease in precipitation and an increase in temperature. Thus, according to our findings, sheep production systems would be affected by a decrease in primary productivity, as well as ELW and L% since these variables are positively associated with precipitation and negatively with temperature. The use of strategic supplementation to meet nutrient requirements and protection from climatic stressors during physiologically demanding production stages of pregnancy and lactation through additional shelter and housing for the sheep could mitigate the effects of climate change by having a positive effect on L% and, therefore, on the total farm income.Estación Experimental Agropecuaria BarilocheFil: Castillo, Daniel Alejandro. Instituto Nacional de Tecnologia Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Área Desarrollo Rural. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituo de Investigaciones Forestales y Agropecuarias Bariloche; ArgentinaFil: Gaitan, Juan Jose. Instituto Nacional de Tecnologia Agropecuaria (INTA). Centro de Investigación de Recursos Naturales. Instituto de Suelos. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Villagra, Edgar Sebastian. Instituto Nacional de Tecnologia Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Área Desarrollo Rural. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituo de Investigaciones Forestales y Agropecuarias Bariloche; Argentin

    Manual - un mundo más sano, una mejor calidad de vida - diseñado para los recuperadores ambientales de Villa Cindy

    Get PDF
    Los recuperadores ambientales que se encuentran ubicados en el barrio Villa Cindy de la localidad de Suba presentan una problemática en cuanto al manejo y el uso que se le está dando a los materiales que reciclan en el día a día. Debido a la falta de conocimiento que se tiene acerca de su reutilización los recuperadores pierden algunas oportunidades de generar mayores beneficios a través de ellos. En este contexto el presente trabajo pretende otorgar una herramienta pedagógica, que tiene como fin concientizar e informar a estas personas acerca del mejor el uso que se le puede dar a los materiales reutilizables enfocándose en un tipo de plástico conocido como polietileno de alta densidad (PEAD).Environmental reclaimers that are located in the neighborhood of Villa Cindy Suba have a problem regarding the handling and use is being given to the materials recycled every day. Due to the lack of knowledge you have the reclaimers about the reuse can reach lose some opportunities to generate greater profits through them. In this context, the paper aims to provide a pedagogical tool, which aims to raise awareness and inform these people about the best use that can be given to reusable materials focusing on a type of plastic known as high density polyethylene (HDPE).Administrador (a) de EmpresasPregrad

    Reactions to synthetic membranes dialyzers: Is there an increase in incidence?

    Full text link
    Background: Reactions to dialyzers used in dialysis have been reported more frequently in recent years. Evidence, however, shows that the reaction rate has remained stable for years. Summary: One explanation for the apparent increase in publication frequency could be the lack of knowledge that dialyzer reactions may well occur with biocompatible membranes. Studies showed that the cause of these reactions is very diverse and varied, involving multiple materials. However, polyvinylpyrrolidone continues to be the main suspect, but without conclusive results. There are no differences between the different fibers, and although polysulfone is the most described, it is also the most used. Key Messages: The change to cellulose triacetate continues to be the most appropriate form of treatment. The classification of these reactions into type A and B complicates the diagnosis, and its true usefulness is in doubtThe research presented in this article is supported by the grants from the Spanish Ministry of Economy and Competitiveness and European Regional Development Funds (ERDF/FEDER) through ISCIII/FIS grants PI16/01298, PI17/01495, CIBERDEM and REDINREN RD016/0019 and through the Madrid Renal Society (SOMANE) grant

    Analysis of international competitive positioning of quality wine from Spain

    Get PDF
    The global vitiviniculture sector is immersed in a dynamic of systemic and thorough changes. Spain holds a privileged position in the global scene, ranking first place in surface area, third in production and second in export volume. In recent years interior consumption has experienced a clear and defined recession, the same as in the case of France and Italy. Therefore, exportation has become the main commercial exit for table and quality wine. In Spain, designated quality wine represents 50% of the total production and has undergone differentiated commercial dynamics compared to table wine in international markets. The object of this paper is to analyze the factors influencing the competitiveness in international markets for quality wine, represented by Designations of Origin. After defining a competitivity index, adapted from the Balassa index, and with environmental and internal variables, three panel data models of the most representative Designations were specified for the 2000/2001 to 2009/2010 seasons. The results showed that environmental variables were more determinant toward understanding the weak competitive international positioning of the more outdistanced Designations. European public regulation by the Common Agricultural Policy ( CAP) and the economic crisis have turned out to be significant and explanatory in this regard. Economies of scale, quality, and unit cost were the most determinant of the interior factors for the most competitive quality wine production areas

    Efficacy and safety of medication use for the cessation of tobacco addiction : A review of Clinical Practice Guidelines

    Get PDF
    Objetivo Revisar la eficacia y seguridad de medicamentos para cesación del tabaquismo en el contexto de construcción de guías de práctica clínica (GPC).Métodos Revisión sistemática de GPC para adaptación mediante ADAPTE. Los desenlaces fueron cesación ≥6 meses y seguridad de las intervenciones. Las GPC se calificaron por pares con DELBI. Se extrajeron resultados de estudios agregativos incluidos en las guías seleccionadas. Resultados Los fármacos duplican la cesación comparados con placebo (tasas de 25,0 % hasta 27,0 % al combinarse con consejería). Los mayores incrementos en cesación se obtienen con ansiolíticos y antidepresivos (8,7% a 19,4%), y los menores con terapia de reemplazo nicotínico –TRN- (5,2 % a 12,9 %). La nortriptilina tiene eficacia similar al bupropion (aproximadamente 10,0 %). Con limitadas excepciones (parche e inhalador, tabletas y bupropion), las combinaciones de medicamentos no incrementan la abstinencia. Conclusiones TRN, vareniclina, bupropion y nortriptilina son eficaces para dejar de fumar. Las combinaciones de medicamentos requieren más evidencia y deberían restringirse a personas con alta dependencia o con falla terapéutica inicial. Serían deseables análisis de costo-efectividad para valorar implementación de programas en países en desarrollo.Q4Objective To review the efficacy and safety of pharmacotherapy for smoking cessation in the context of clinical practice guidelines (CPG).Methods A systematic review of CPGs was conducted, aimed at adapting recommendations for Colombia following the ADAPTE methodology. Outcomes comprised 6-months or higher smoking cessation rates and intervention safety. CPGs were peer-assessed based on DELBI. Results from aggregative studies included in selected CPGs were obtained.Results Pharmacotherapy doubles smoking cessation rates as compared with placebos (rates 25% and up to 27 % when combined with counseling). The highest efficacy was observed for ansyolitic and antidepressive drugs (8.7 % to 19.4 %), and the lowest for nicotine replacement therapy -NRT- (5.2 % to 12.9 %). Nortriptiline shows an efficacy similar to that of bupropion (10%). With limited exceptions, combined pharmacotherapy for smoking cessation has shown no significant increase in cessation rates. Conclusions NRT, varenicline, bupropion and nortriptiline are effective treatments for smoking cessation. Combination of drugs deserves further clinical evidence and should be restricted to highly dependent smokers or initial therapeutic failure. Cost-effectiveness analyses might help to introduce smoking cessation programs in low and middle income countries.https://orcid.org/0000-0002-6186-7842https://orcid.org/0000-0002-7516-8612https://orcid.org/0000-0001-7187-9946Revista Nacional - Indexad
    corecore