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Diseño de equipos con energía solar para el secado de café : fundamentos teóricos y aplicaciones
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Detección de patrones asociados al desempeño académico en las pruebas saber 5° de los estudiantes del departamento de nariño con árboles de decisión
Full text linkSustainable practices in the cocoa value chain: a systematic literature review
Full text linkIntroduction: This article identifies sustainable practices in cocoa farming, in the new scenarios of voluntary certifications and the circular economy. Objective: The main objective is to analyse and synthesise the sustainable strategies and approaches implemented in the cocoa value chain. Methodology: The PRISMA protocol was applied, which was used to define the 45 documents from the Scopus and Web of Science databases that were part of the systematic literature review with a publication range between 2016 and 2024. Results: Agroforestry widely emerges as the main production strategy to minimise the overall environmental and socioeconomic impacts associated with cocoa production. Sustainable practices focus on production and governance aspects. Conclusions: In relation to sustainability standards, there is a transition from voluntary approaches to stricter regulations within the value chain that force cocoa producers to adopt sustainable investment decisions, which not only comply with environmental and labour standards, but also generate long-term benefits
Effect of the degradation of different dissolved NOM fractions by the heterogeneous Fenton treatment on the emergence of trihalomethanes and haloacetic acids at drinking water treatment plants
Full text linkHydrophobic, hydrophilic, and transphilic fractions of natural organic matter, which are all present in drinking
water treatment plants, can play a crucial role on the formation of disinfection by-products after chlorination. In
this work, catalytic wet peroxide oxidation (heterogeneous-Fenton) activated by an aluminum/iron-pillared clay
catalyst, was tested as an alternative to remove different organic fractions and evaluated its effect on disinfection
by-products formation in several stages of two full-scale drinking water treatment plants in Narino˜ (Colombia).
The advanced treatment removed 87 % hydrophobic, 36 % hydrophilic, and 70 % transphilic fractions in raw
water with mostly hydrophobic character, while in the hydrophilic case, it was removed 47 % hydrophobic, and
40 % hydrophilic fractions. Interestingly, formation of trihalomethanes was reduced in up to 81 %, and haloacetic acids in up to 83 %. Also, the process significantly degraded high (~661 kDa) and low (~6.2 kDa) average
molecular weight hydrophobic fractions into lighter, but less disinfection by-products forming ones. Meanwhile,
the high average molecular weight (~1000 kDa) hydrophilic fraction was instead transformed into a lighter
fraction (<3 kDa). The process showed to be highly efficient to degrade natural organic matter with different
polar nature at room temperature and natural pH. However, the application of this treatment on the effluent of a
conventional physicochemical unit (from hydrophilic water supply sources) must be avoided, since the residual
organic content displayed higher potential for haloacetic acids formation. On the contrary, in hydrophobic water
supply sources, it is recommended to apply the process at this point of treatment
Sistematización y clasificación de actividades matemáticas diseñadas desde la etnomatemática
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Timelines associated with the neonatal jaundice care cycle and assessment of caregiver satisfaction
Full text linkIntroduction: Neonatal hyperbilirubinemia is a major health problem, a common cause of morbidity. Worldwide, it affects up to 60% of term newborns. Its diagnosis is by means of serum bilirubin levels, which is associated with certain disadvantages, especially in terms of discomfort related to delayed results. Objective: To evaluate the relationship between caregiver satisfaction and the time associated with the cycle of care for the diagnosis of neonatal jaundice. Materials and methods: Cross-sectional observational study, neonates with clinical evidence of jaundice were included. Demographic data were collected, a satisfaction survey was applied to evaluate the level of caregiver satisfaction, and the times associated with the cycle of care from the moment of admission to the medical procedure were recorded. Results: A patient flow analysis was performed, and it was found that waiting time is significant, especially in obtaining laboratory results. Caregivers' satisfaction with waiting times influences their overall perception of service quality. Conclusions: The potential implementation of new diagnostic instruments could generate added value to the service by speeding up medical decision making
