61 research outputs found

    Systematic Review: Analysis of the economic modeling of biodiversity in rural agricultural households, recommendations for future reports

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    [ES] Los modelos de agricultura familiar, han sido utilizados para analizar ex-ante diferentes pol铆ticas; sin embargo, se desconoce el estado del arte con relaci贸n a la evaluaci贸n de la biodiversidad dentro de estos modelos. Por esta raz贸n, se desarroll贸 una revisi贸n sistem谩tica de modelos de agricultura familiar que integren la variable 鈥渂iodiversidad鈥. Para tal efecto, se consultaron buscadores especializa-dos, aplicando una estrategia de b煤squeda gen茅rica, que permiti贸 identificar 1420 art铆culos, de los cuales solo 23 fueron seleccionados en base a criterios de inclusi贸n espec铆ficos. Se evidencia un vac铆o en la evaluaci贸n de la biodiversidad dentro de los modelos de agricultura familiar.[EN] The Farm-Household models have been used to analyze ex-ante different policies; however, the state of the art is unknown in relation to the evaluation of biodiversity within these models. For this reason, a systematic review on Farm-Household models that integrate the 鈥渂iodiversity鈥 variable is required. For this purpose, we consulted a specialized search engine, applying a generic search strategy, which identified 1420 articles, of which only 23 were selected based on specific inclusion criteria. There is a gap in the evaluation of biodiversity within Farm-Household models.Los autores agradecen al Convenio de Subvenci贸n N.掳 200-2015-FONDECYT, que en su cl谩usula tercera otorga a favor de la Universidad Nacional Agraria La Molina una subvenci贸n para el desarrollo del Doctorado de Econom铆a de los Recursos Naturales y desarrollo sustentableReyes-Mandujano, IF.; Fern谩ndez, FJ.; Mercado, W.; Gom茅z, L.; Ponce, RD. (2020). Revisi贸n Sistem谩tica: an谩lisis de la biodiversidad en las econom铆as rurales mediante el modelo de hogares agr铆colas y recomendaciones para futuros reportes. Econom铆a Agraria y Recursos Naturales - Agricultural and Resource Economics. 20(1):53-75. https://doi.org/10.7201/earn.2020.01.03OJS537520

    Reproductive biology of little tunny Euthynnus alletteratus (Rafinesque, 1810) in the southwest Gulf of Mexico

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    The aim of this study was to describe the reproductive dynamic of Euthynnus alletteratus in the southwest Gulf of Mexico. The annual variation of the volume fraction occupied by gametes and tissues in gonads were related with main body indexes, such as the gonadosomatic index (IG), the hepatosomatic index (IH), and the nutrition index (IN), and compared with the sea surface temperature. A total of 951 E. alletteratus individuals were sampled, where a sex ratio of 1:1 and a size interval strongly skewed towards organisms with a fork length (LF) of 36鈥40 cm were observed. The IG showed an increase from March to September with maximum values in April and July. Two clearly defined peaks were observed, and they were consistent with the histological analysis, where the percentage of ripe gametes predominated from April to September. The optimum thermal window for reproductive activity was from 24 to 28 掳C. The size of first sex maturity was 34.35 cm of LF for males and 34.60 (LF) for females, without significant difference between sexes

    Desgaste por abrasi贸n del acero api 5l x65 revestido con niobio por aspersi贸n t茅rmica a plasma y con inconel 625 por soldadura

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    El objetivo de este trabajo fue evaluar y caracterizar el comportamiento mec谩nico en desgaste del acero API 5L X65, revestido con niobio en comparaci贸n al desempe帽o del revestimiento de la aleaci贸n de inconel 625 empleados en la industria de petr贸leo y gas. El revestimiento de niobio fue obtenido por el proceso de aspersi贸n t茅rmica a plasma de arco no transferido y el revestimiento inconel 625 por soldadura con electrodo revestido. La resistencia al desgaste por abrasi贸n fue evaluada seg煤n la norma Petrobras N-2567, en un trib贸metro CTER, la rugosidad y el volumen de material desgastado se determin贸 a trav茅s de perfilometr铆a y la dureza de los revestimientos por microscopia Vickers. Los revestimientos obtenidos fueron caracterizados respecto a su morfolog铆a por microscopia electr贸nica de barrido (MEB) y microscop铆a 贸ptica (MO). La dureza del revestimiento de niobio obtenido puede haber contribuido a reducir la tasa de desgaste en comparaci贸n con el revestimiento de inconel 625

    Potential of Core-Collapse Supernova Neutrino Detection at JUNO

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    JUNO is an underground neutrino observatory under construction in Jiangmen, China. It uses 20kton liquid scintillator as target, which enables it to detect supernova burst neutrinos of a large statistics for the next galactic core-collapse supernova (CCSN) and also pre-supernova neutrinos from the nearby CCSN progenitors. All flavors of supernova burst neutrinos can be detected by JUNO via several interaction channels, including inverse beta decay, elastic scattering on electron and proton, interactions on C12 nuclei, etc. This retains the possibility for JUNO to reconstruct the energy spectra of supernova burst neutrinos of all flavors. The real time monitoring systems based on FPGA and DAQ are under development in JUNO, which allow prompt alert and trigger-less data acquisition of CCSN events. The alert performances of both monitoring systems have been thoroughly studied using simulations. Moreover, once a CCSN is tagged, the system can give fast characterizations, such as directionality and light curve

    Duraci贸n e intensidad de la puesta y su dependencia del tama帽o corporal: El caso del bonito Euthynnus alletteratus capturado en el suroeste del Golfo de M茅xico

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    In terms of fish dynamic population, reproduction is a process related with corporal size of each population member, which is tied with the spawning time and number of eggs produced. In order to relate the size of female little tuny (Euthynnus alletteratus), located in the southwest Gulf of Mexico, and its contribution in reproductive process, cycle and reproductive characteristics were analyzed by different size groups. Biological data were obtained by the artisanal fishing fleet of Ant贸n Lizardo Veracruz community (Mexico). A total of 480 fish were caught from December 2009 to November 2012. Size structure, gonadosomatic index and duration and intensity spawning index (IDI) were determined. The gonadosomatic index showed a decrease in the population after April and July. Nevertheless, these months and the fraction of spawning female may vary depending on size groups. According with the IDI, the individuals with the highest contribution in reproductive process belong to sizes from 44 to 56 cm. Therefore, in order to guarantee the conservation of this species, it is imperative to mainly direct the management measures towards the females from these sizes