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Characterization of flipped classroom model in higher education: a perception from educational resilience during COVID-19 pandemic
No full textThis article presents a study about some perceptions of university students' perceptions in Barranquilla, Colombia about flipped classrooms during Covid-19 pandemic. The group of participants were 302 students who are studying in different universities of the city and took their virtual or remote classes with a flipped classroom strategy. Students identified their learning styles, experiences and characteristics of the virtual or remote classes and their class preferences. In addition, they mentioned resources and learning spaces used by the teachers that promote collaboration and knowledge development and technology used by the university to develop classes. Given the results of the survey, it was determined that flipped classroom strategy is a useful method for the students because it allowed them to be more self-taught (independent learning) during pandemic. It was possible to identify their learning styles and to create spaces of greater participation with the teachers as guides. Flipped classrooms allow learning by doing, developing and participating and no memorizing (traditional method) supported by emerging technologies applied in university teaching. These technologies must be combined with different strategies that allow the development of skills, teamwork and comprehension of the topics
An advanced combination of density functional theory simulations and statistical physics modeling in the unveiling and prediction of adsorption mechanisms of 2,4-D pesticide to activated carbon
No full textIn this study, six statistical physics (sta-phy) models were used to further describe and enlighten the mechanisms behind the adsorption of a low interaction model molecule through the interpretations of the real and ideal gas. Density functional theory (DFT) was employed for the simulation of electronic structure and reactivity parameters (
, η, μ, and ω). Experimental assays were carried out with a representative activated carbon sample and 2,4-dichlorophenoxyacetic acid (2,4-D) pesticide as a base for the modeling and simulation. According to the classical interpretations, the adsorption was a monolayer exothermic process dependent on temperature. From the sta-phy perspective, the Hill model for monolayer adsorption with two energies best described the process. According to the estimations, the number of molecules adsorbed increases with increasing temperature, yet the number of primary adsorption sites () decreases with increasing temperature. The concentrations at a half-saturation (), in turn, increase with the increase in temperature. At last, by combining the sta-phy estimations with the DFT interpretations, it was possible to infer that, in addition to the thermal effects, electrostatic repulsion is a possible contribution that increases as the primary receptor sites are occupied. Therefore, the combination of simulations can provide answers to unclear mechanistic steps and help predict the contribution of the adsorbate to the estimated sta-phy parameters, with a very high degree of precision as statistically validated
Diagnostic accuracy of the UDS 3.0 neuropsychological battery in a cohort with Alzheimer’s disease in Colombia
Get PDFAlzheimer’s disease (AD) is a neurodegenerative disease that causes a gradual loss of cognitive functions and limits daily activities performance. Early diagnosis of AD is essential to start timely treatment. This study aimed to validate the Uniform Data Set neuropsychological battery version 3.0 (UDS 3.0) in a Colombian cohort. This study is a cross-sectional type, consecutive, incidental, with 143 persons, divided into two groups: 48 diagnosed AD cases and 95 healthy controls, between the ages of 50 and 80+, and between 1 and 19+ years of education.The results indicate differences between the control group and the AD group in most battery tests. A significant correlation was found between the Montreal Cognitive Assessment (MoCA), Multilingual Naming Test (MINT), Craft Story, Benson Figure Test, P-word and F-word Phonemic Fluency Test, and their respective reference tests. Cutoff points were found based on the Youden index for each sub-test. The results indicate that all sub-tests are above the reference line of the ROC curve. The use of the UDS 3.0 in Colombia would help improving clinical diagnostic routes because of its high accuracy and high correlation with tests that measure general impairment; it has good sensitivity and specificity, and it can be a useful tool for AD.Porto, Maria Fernanda-will be generated-orcid-0000-0002-9313-1215-600Benitez Agudelo, Juan Camilo-will be generated-orcid-0000-0003-1995-1300-600Aguirre-Acevedo, Daniel Camilo-will be generated-orcid-0000-0002-8195-8821-600Barceló-Martinez, ErnestoAllegri, Ricardo Francisco-will be generated-orcid-0000-0001-7166-1234-60
Introduction to the special issue “Nanomaterials and their influence on the Planet”
No full textNaturally occurring, incidental, engineered nanomaterials, and nanominerals have a significant influence on Earth and human health (Wu et al., 2022). These also present ecological factors connected to accumulating water contamination, emerging pollutants in nature, greenhouse gas production, and toxic effects of fuels and chemicals (Rodriguez-Iruretagoiena et al., 2022, Yokoo et al., 2022). This special issue of Gondwana Research assembles a set of contributions that provide an overview of nanoscience-based environmental applications and discoveries concerning phosphogypsum wastes, mineral mining, refining/production, and disposal of mining wastes; soil health; sediment influences to water quality; general contaminant remediation strategies; and atmospheric geochemistry changes. These processes result in massive nanoparticle generation which have highly significant environmental implications and human health consequences on local, regional, and even global levels (Li et al., 2022, Ren et al., 2022). Until recently, very little was known about nanoparticle fractions. Recent advancements and sophistications enable us to detect, collect and study these materials which are roughly 1 nm (0.001 µm) up to several tens of nanometers in size. These materials are known to behave differently (chemically, electrically, and mechanically), relative to their macroscopic equivalents. This is what makes nanoscience fascinating and difficult to predict, underscoring the importance of this emerging new field. This incorporates extensive and distant transportation downstream, and finally to seas such as is the case of acid mine drainages (Caraballo et al., 2022). In terms of human health, in all phases of mining, production/refining, use, and waste disposal, the associated nanoparticles can be acquired through oral ingestion, inhalation, and dermal absorption (Wu et al., 2022). There is also a current gap among what we so far know about the behavior of nanoparticles, and what remains to be determined. In addition, eco-friendly and green nano-sciences holds abundant promise to solve large-scale challenges offering results to these complications in the form of preventive and remedial tools to diminish contaminants from the ecosyste
Informal settlements in the urban periphery of metropolitan areas. The case of Soledad, Colombia
No full textEl proceso de metropolización de la ciudad de Barranquilla (Colombia) trajo consigo diferentes problemas socioespaciales relacionados con el crecimiento de asentamientos humanos informales en la periferia urbana del municipio de Soledad. Este artículo analiza el crecimiento de asentamientos informales en la periferia urbana del municipio de Soledad y plantea estrategias para la intervención de estas comunidades, mediante la articulación del programa de Mejoramiento Integral de Barrios (MIB) y el Plan de Desarrollo Municipal. La metodología es cuanti-cualitativa con diseño descriptivo basado en la revisión documental y el uso de SIG para la georreferenciación de los asentamientos. Los resultados y discusión demuestran que el crecimiento de asentamientos informales ha contribuido a la alta densificación y crecimiento poblacional desmedido de Soledad. Asimismo, la autoconstrucción de viviendas en invasiones provocó en los últimos 10 años la reducción entre 30-50% de la cobertura vegetal y la desforestación en áreas periféricas del municipio.O processo de metropolização da cidade de Barranquilla (Colômbia) trouxe consigo diversos problemas espaciais relacionados ao crescimento dos assentamentos humanos informais na periferia urbana do município de Soledad. Este artigo analisa o crescimento dos assentamentos informais na periferia urbana do município de Soledad e propõe estratégias para a intervenção dessas comunidades, por meio da articulação da política nacional de Melhoria Integral do Bairro (MIB) e do Plano de Desenvolvimento Municipal. A metodologia é quantitativa-qualitativa com desenho descritivo baseado na revisão documental e no uso de SIG para o georreferenciamento dos assentamentos. Os resultados e discussões mostram que o crescimento dos assentamentos informais tem contribuído para o alto adensamento e crescimento populacional excessivo de Soledad. Da mesma forma, a autoconstrução de casas em invasões causou nos últimos 10 anos a redução entre 30-50% da cobertura vegetal e o desmatamento em áreas periféricas do município.The urbanization of the city of Barranquilla (Colombia) increased informal human settlements in the urban periphery of the municipality of Soledad. This paper analyzes the growth of informal settlements in the urban periphery of the municipality and proposes strategic axes for the intervention of these communities through the articulation of the national policy for Comprehensive Neighborhood Improvement (MIB) and the Municipal Development Plan. It is based on a quantitative-qualitative methodology with a descriptive design supported by a documentary review and the use of GIS for the georeferencing of settlements. The results and discussions show that the growth of informal settlements has contributed to the high densification and excessive population growth in Soledad. Likewise, over the last 10 years, the self-construction of houses in invasions reduced in between 30-50% the vegetal cover and the deforestation in peripheral areas of the municipality
Future of human resources in the implementation of 5G technology
No full textEl 5g cambiará de manera disruptiva paradigmas actuales, modificando nuestros hábitos cotidianos surgirán nuevas necesidades para las empresas, y en consiguiente modificará los procesos de reclutamiento exigiendo a los profesionales adaptarse bajo la nueva normalidad. El objetivo del presente artículo es determinar el futuro de los recursos humanos ante la imple- mentación de la tecnología 5g; analizar el impacto que tiene esta revolución tecnológica y medir la relevancia de los recursos humanos ante esta nueva realidad. A partir del método de revisión sistemática se evaluó el impacto de la tecnología 5g y la relevancia de los recursos humanos; se mencionan las proyecciones de los empleos más demandados y las tecnologías adoptadas por las organizaciones. Finalmente se destaca el perfil laboral requerido por parte de los entes. Se concluye que el papel de los recursos humanos en una
organización siempre será de suma importancia, sin este difícilmente se alcanzará el éxito empresarial.5g will disrupt change current paradigms, modifying our daily habits, new needs will arise for companies, and consequently it will modify the recruitment processes, requiring professionals to adapt to the new normal. The objective of this article is to determine the future of human resources before the implementation of 5g techno- logy; analize the impact of this technologi- cal revolution and measure the relevance of human resources to this new reality. Take the systematic review method, the impact of 5g technology and the relevance of human resources were evaluated; The projections of the jobs most in demand and the technologies adopted by the organizations are mentioned. Finally, the job profile required by the entities is highlighted. It is concluded that the role of human resources in an organization will always be of utmost importance, without it it will be difficult to achieve business success
A virtuous circle? The effects of university-industry relationships in a region with low absorptive capacity
Get PDFThis article examines the effects of university-industry relationships (UIRs) in a Spanish region - Valencian Community - with low absorptive capacity. The analysis considers two effects of UIRs, one on business innovation and the other on the scientific production of academic researchers. The results reveal that UIRs have no significant effects on either firms' technological innovation or academic scientific production. Therefore, these results suggest that, in territories with low absorptive capacity, UIRs, mainly R&D-based, do not produce the effects found in other contexts, which requires some rethinking about these types of territories. © 2020 The Author(s).Vega Jurado, JManjarrés Henríquez, LFernández De Lucio, INaranjo Africano,
Development of a biosponge based on Luffa cylindrica and crosslinked chitosan for Allura red AC adsorption
Get PDFA new bioadsorbent from Luffa cylindrica and cross-linked chitosan was proposed in the present study. Luffa was used as a natural support medium for chitosan crosslinked with glutaraldehyde (LCsG) and epichlorohydrin (LCsE). Biosponges were applied to remove Allura red from aqueous solutions. LCsG and LCsE were produced using different concentrations of chitosan (1%, 3% and 5% (m v−1)) and crosslinking agents (0.5%, 1.0% and 1.5% (v v−1)). Based on the FT-IR spectra, functional groups characteristic of chitosan crosslinked with glutaraldehyde and epichlorohydrin confirmed the crosslinking. In addition, the biosorbent revealed highly efficient functional groups and morphology with irregularities favorable for adsorption. It was found that the increase in the percentage of glutaraldehyde and epichlorohydrin increased the sample's swelling degree, and the degree of cross-linking was greater than 80% for all LCsG. The results regarding the degree of swelling and degree of crosslinking corroborated with the evaluation of the biosponge's adsorptive potential. The Sips model predicted the equilibrium isotherms, with a maximum adsorption capacity of 89.05 mg g−1 for LCsG and 60.91 mg g−1 for LCsE. The new procedure was successful. Luffa was excellent support for chitosan, resulting in an attractive, low-cost bioadsorbent, preventing renewable sources.Schio, Rejiane R.Gonçalves, Janaína-will be generated-orcid-0000-0003-2152-464X-600Mallmann, Evandro S.Pinto, Diana-will be generated-orcid-0000-0002-5958-6216-600Dotto, Guilherme Luiz-will be generated-orcid-0000-0002-4413-8138-60
Quantifying the years of life lost due to COVID-19 in Colombia: preliminary estimates
Get PDFTo estimate the years of life lost (YLLs) due to COVID-19 in Colombia and assess its economic impact by valuing the potential years of productive life lost (PYLLs). We conducted an ecological study to estimate the number of premature deaths associated with COVID-19 and calculate the present value of their expected future earnings using a discount rate of 3%. We considered deaths occurred from March to November 9, 2020. We used the modified criteria in the 2010 Global Burden of Disease (GBD) Study to estimate YLLs, adding the deaths for each age group and multiplied by the life expectancy of the respective age group up to the age limit considered. From the human capital approach, we estimated PYLLs to show the number of years of premature deaths caused by COVID-19, when fatalities occurred between 15-64 years old, the timeframe of economically active life for all estimates. We present results in 2020 U.S. dollars. The 32,974 deaths from COVID-19 have produced 697,512 YLLs, of which 66.0% are in men. Around 76.2% of these YLLs occur in people >50 years. On average, each death from COVID-19 contributed 21.2 YLL. The YLLs rate is 1,385 (women: 963; men: 1,787) per 100,000 inhabitants. The mean rate of YLLs in people aged ≥50 years is about ten times that of those <50 years (5,059 vs. 561 per 100,000). Premature deaths in the Colombian economically active population accounted for 89,667 PYLLs (74.6% in men). 58.8% of the PYLLs occurred in the population aged 40-64 years. The economic burden associated with this goes from US306 million (0.05-0.10% of the 2019 gross domestic product). At the end of 2020, COVID-19 would be the leading cause of death in Colombia and the most critical disease burden factor, above cardiovascular diseases, and neonatal disorders.ALVIS-ZAKZUK, NELSON J.-will be generated-orcid-0000-0001-9382-214X-600Alvis-Guzmán, Nelson-will be generated-orcid-0000-0001-9458-864X-600Diaz-Jiménez, D.Dueñas Castell, C.Rojas-Suarez, J.Fernandez Mercado, J. C.Paternina-Caicedo, A.Castañeda-Orjuela, C.De La Hoz, F
Locating sea ambulances to respond to emergencies of vulnerable populations. Case of Cartagena bay in Colombia
Get PDFEmergency services are an important element for healthcare assistance because its rapid response to transportation is essential for saving lives. Cartagena de Indias presents some weaknesses in terms of covering the demand for emergency transfers from insular areas due to the non-existence of terrestrial routes to hospitals and healthcare facilities. This study aims to determine the optimal location for sea ambulances using a mixed-integer linear programming model. A three-staged methodology allowed to select optimal locations, reducing response times of emergencies for vulnerable populations considering available healthcare facilities and maritime safety requirements. © 2021, Springer Nature Switzerland AGCoronado-Hernandez, Jairo R.-will be generated-orcid-0000-0003-4360-6128-600Rico-Carrillo, MarlyRico-Carrillo, KatherineZapateiro, Orlando-will be generated-orcid-0000-0003-4567-9814-60