RESUMO: O objetivo deste trabalho foi extrair lignina de Eucalyptus sp. licor negro kraft e avaliar a influência de sua adição nas propriedades do adesivo lignina-fenol-formaldeído. Os adesivos foram sintetizados em diferentes porcentagens de massa de fenol por lignina, denominados adesivos lignina-fenol-formaldeído nas proporções de 25, 30, 50, 75 e 80%. Os parâmetros avaliados nos adesivos foram pH, teor de sólidos totais, teor de compostos orgânicos, teor de compostos inorgânicos, tempo de gelatinização e comportamento do adesivo na linha de cola. O pH variou de 10,63 a 11,65. Para o teor de sólidos totais foi encontrado o valor de 53 a 69%. Os teores de compostos orgânicos variaram de 51 a 75% e de inorgânicos de 25 a 49%. Observou-se que com a adição da macromolécula na formulação do adesivo, o teor de sólidos totais e orgânicos foi reduzido proporcionalmente enquanto o de sólidos inorgânicos foi elevado. O tempo de gelatinização foi reduzido devido à adição de lignina. As menores proporções de adição apresentaram melhor penetração e fluidez na interface com a madeira. A lignina kraft extraída do licor negro kraft de eucalipto é um ótimo adesivo com potencial para substituir parcialmente o fenol derivado do petróleo, com grande potencial para uso e aplicação nos setores aeronáutico e automotivo, no processo de colagem de peças estruturais. RESUMO sp ligninafenolformaldeído. ligninafenolformaldeído formaldeído. formaldeído 30 50 7 80 80% cola 1063 10 63 10,6 1165 11 65 11,65 5 69 69% 2 49 49% Observouse Observou se elevado madeira petróleo automotivo estruturais 3 8 106 1 6 10, 116 11,6 4 11,

ABSTRACT: The objective of this research was to extract lignin from Eucalyptus sp. kraft black liquor and to evaluate the influence of its addition on the properties of the lignin-phenol-formaldehyde adhesive. The adhesives were synthesized at different phenol mass percentages by lignin, called lignin-phenol-formaldehyde adhesives in the proportions of 25, 30, 50, 75 and 80%. The parameters evaluated in the adhesives were pH, total solid content, organic compound content, inorganic compound content, gelatinization time and adhesive behavior in the glue line. The pH ranged from 10.63 to 11.65. For the total solid content was found the value of 53 to 69 %. The contents of organic compounds ranged from 51 to 75% and inorganic from 25 to 49%. It was observed that with the addition of macromolecule in the adhesive formulation, the total and organic solid content was reduced proportionally while the inorganic solid was high. The gelatinization time was reduced due to the addition of lignin. The lower proportions of addition presented better penetration and fluidity in interface with the wood. The kraft lignin extracted from eucalyptus kraft black liquor is a great adhesive with potential to partially replace petroleum-derived phenol, with great potential for use and application in the aeronautical and automotive sectors, in the bonding process of structural parts. ABSTRACT sp ligninphenolformaldehyde formaldehyde 30 50 7 80 80% line 1063 10 63 10.6 1165 11 65 11.65 5 6 % 2 49 49% formulation high wood petroleumderived petroleum derived sectors parts 3 8 106 1 10. 116 11.6 4 11.

Resumen: Con la crisis del petróleo de principios de la década del 70, vimos el inicio del fin de los "años dorados" del modelo burocrático, en la década siguiente el modelo ya estaba ampliamente desacreditado hasta el punto del modelo de reemplazo, Nueva Gestión Pública. (NGP), siendo visto como superior. Sin embargo, los académicos señalan que la NGP no es más que "creencias precientíficas" y Denhardt y Denhardt (2000) proponen el nuevo servicio público que, entre otros aspectos, tiene como objetivo superar el individualismo y el economicismo subyacentes a la NGP. Sin embargo, los supuestos del Nuevo Servicio Público se acercan a los que ha defendido Ubuntu. Por tanto, la pregunta es: qué es Ubuntu, cuáles son los presupuestos del nuevo servicio público y cuáles son sus puntos de convergencia. Basado en una metodología que combina una visión subjetivista y una epistemología del poscolonialismo, este estudio de caso de investigación cualitativa se basó técnicamente en la revisión de la literatura y el análisis del discurso. Se concluyó que las propuestas del nuevo servicio público convergen con los cimientos de Ubuntu y que, a pesar de ser epistemologías construidas en distintos lados de las fronteras, pueden dialogar y complementarse. Resumen 70 años dorados burocrático reemplazo Pública NGP, , (NGP) superior embargo creencias precientíficas 2000 (2000 aspectos tanto convergencia poscolonialismo discurso fronteras complementarse 7 (NGP 200 (200 20 (20 2 (2 (

Abstract: With the oil crisis at the beginning of the 70s, we saw the beginning of the end of the "golden years" of the bureaucratic model, in the following decade the model was already largely discredited, therefore, material and intellectual conditions led us to believe in and defend the superiority of the substitute model, New Public Management (NPM). However, scholars point out that NPM is nothing more than "pre-scientific beliefs" and Denhardt and Denhardt (2000) proposed the New Public Service (NPS) model which, among other aspects, aims to overcome the individualism and economism underlying NPM. However, the assumptions that shape the New Public Service propose the rescue of values that have been defended by Ubuntu for decades. The question is: what is Ubuntu, what are the assumptions of the new public service and what are its points of convergence. In ontological terms, this study adopts a subjectivist view and, epistemologically, it is anchored in post-colonialism. This is a case study associated with qualitative research that was technically based on literature review and discourse analysis. It was concluded that the proposals for the new public service converge with the foundations of Ubuntu and that, despite being epistemologies built on different sides of the borders, they can dialogue and complement each other. Abstract 70s s golden years discredited therefore . (NPM) However prescientific pre scientific beliefs 2000 (2000 NPS (NPS which aspects decades convergence terms epistemologically postcolonialism. postcolonialism post colonialism. colonialism post-colonialism analysis borders (NPM 200 (200 20 (20 2 (2 (

Resumo: Com a crise do petróleo no início da década de 1970, assistiu-se ao princípio do fim dos "anos dourados" do modelo burocrático. Na década seguinte, o modelo já estava amplamente desacreditado; por conseguinte, condições materiais e intelectuais levaram a crer e defender a superioridade do modelo substituto, a Nova Gestão Pública (NGP). No entanto, estudiosos apontam que a NGP não passa de "crenças pré-científicas", e Denhardt e Denhardt (2000) propuseram o modelo do Novo Serviço Público (NSP) que, dentre outros aspetos, visa superar o individualismo e o economicismo subjacente à NGP. No entanto, os pressupostos que fundamentam o NSP propõem o resgate de valores que há décadas são defendidos pelo Ubuntu. Questiona-se: o que é Ubuntu, quais são os pressuposto do Novo Serviço Público e quais são os seus pontos de convergência. Em termos ontológicos, este estudo adopta uma visão subjetivista e, epistemologicamente, ancora-se no pós-colonialismo. Este é um estudo de caso associado à pesquisa qualitativa que tecnicamente alicerçou-se na revisão da literatura e análise de discurso. Concluiu-se que as propostas do Novo Serviço Público convergem com os fundamentos do Ubuntu e que, a despeito de serem epistemologias construídas em lados diferentes das fronteiras, podem dialogar e se complementar. Resumo 1970 assistiuse assistiu anos dourados burocrático seguinte desacreditado conseguinte substituto . (NGP) entanto crenças précientíficas, précientíficas pré científicas , pré-científicas" 2000 (2000 (NSP aspetos Questionase Questiona Questiona-se convergência ontológicos epistemologicamente ancorase ancora póscolonialismo. póscolonialismo pós colonialismo. colonialismo pós-colonialismo alicerçouse alicerçou discurso Concluiuse Concluiu fronteiras complementar 197 (NGP pré-científicas 200 (200 19 20 (20 1 2 (2 (

Abstract Background: Eriobotrya japonica is economically significant as an ornamental tree, and its leaves have medicinal properties. Question: What are the main chemical components of loquat leaves grown in a population of Central Veracruz Mexico? and does the methanolic extract have potential antidiabetic properties through α-glucosidase inhibition? Species study: Eriobotrya japonica (Thunb.) Lindl. (Rosaceae) Study site and date: Xalapa, Veracruz, Mexico, 2021-2022. Methods: Total carbon (C) and nitrogen (N) content, phosphorus (P), sodium (Na), potassium (K), calcium (Ca), and magnesium (Mg) were determined in leaves powder. Leaf methanol extract of E. japonica was tested for α-glucosidase inhibition. Also, different groups of secondary metabolites were detected by the phenolics/volatile-targeted metabolomic analysis. Results: The leaves of E. japonica are rich in C and minerals such as Na, K, Ca, and Mg, and contain high levels of flavonoids, and procyanidin B2. The leaf methanol extract (LME) effectively inhibited α-glucosidase activity (86.05 ± 0.73 %) in vitro. In addition, a leaf petroleum ether extract (LPE) contains mainly phytol, palmitic acid, linoleic acid, stearic acid, and phytol acetate. Conclusions: The leaf methanolic extract exhibited antidiabetic potential due to its potent α-glucosidase inhibition, and the presence of diverse phenolic compounds, including flavonoids and their glycoside derivatives, and some fatty acids further supports the traditional use of E. japonica as an herbal medicine with antidiabetic properties.

Resumen Antecedentes: Eriobotrya japonica es de importancia económica como árbol ornamental, y sus hojas tienen propiedades medicinales. Pregunta: ¿Cuáles son los principales componentes químicos de las hojas de níspero en una población del centro de Veracruz México? ¿Tiene el extracto metanólico propiedades antidiabéticas potenciales a través de la inhibición de la α-glucosidasa? Especie de estudio: Eriobotrya japonica (Thunb.) Lindl. (Rosaceae) Sitio y año de estudio: Xalapa, Veracruz, México, 2021-2022. Materiales y métodos: Se determinó el contenido total de carbono (C) y nitrógeno (N), fósforo (P), sodio (Na), potasio (K), calcio (Ca) y magnesio (Mg) en el polvo foliar. Se analizó el extracto metanólico de hoja (LME) de E. japonica para determinar la inhibición de la α-glucosidasa. Además, se detectaron diferentes grupos de metabolitos secundarios mediante el análisis metabolómico dirigido a fenólicos/volátiles. Resultados: Las hojas de E. japonica son ricas en C y minerales como Na, K, Ca y Mg, y contienen altos niveles de flavonoides y procianidina B2. El extracto metanólico foliar (LME) inhibió eficazmente la actividad de la α-glucosidasa (86.05 ± 0.73 %) in vitro. Además, un extracto de éter de petróleo (LPE) de hoja contiene principalmente fitol, ácido palmítico, ácido linoleico, ácido esteárico y acetato de fitol. Conclusiones: El extracto metanólico de la hoja exhibió potencial antidiabético debido a su potente inhibición de la α-glucosidasa y la presencia de diversos compuestos fenólicos, incluidos flavonoides y sus derivados glucósidos, y algunos ácidos grasos respaldan el uso tradicional de E. japonica como medicina herbaria con efectos antidiabéticos.

ABSTRACT The rock-fluid interaction is associated with formation damage and occurs due to the introduction of foreign fluids that cause chemical and physical imbalances in the rock matrix and in the fluids insides, which reduces the permeability of formation The objective of the research is to evaluate properties of rock-fluid interaction in an improved recovery process. The research is developed on a laboratory scale with injection of chemical formulation, in search of alternatives for the improvement of oil production and the increase of the recovery factor of the reservoirs. Wettability tests and physical-chemical characterization of the injected fluids and effluents (total dissolved solids, density, conductivity, chloride, calcium, magnesium and pH) were carried out before and after contact with the formation. Based on determinations of density, water and sediment content, asphaltenes and rheological behavior, the characterization of the crude oil from the Seboruco well was carried out, as well as the layer water that was analyzed for its ionic composition and its classification. Such tests indicated a heavy and pseudoplastic crude oil, and a sodium hydrocarbonated layer water. The rock-fluid interaction tests showed significant changes in the wettability of the rock, from to oil-wet to water-wet. The analyzes of the effluents corroborated ionic exchange in the rock-fluid system such as: The increases in pH and increased content of chloride, calcium and magnesium obtained during the formulation step, which in some way favored the displacement of crude oil in the porous medium.

RESUMEN La interacción roca-fluido se asocia al daño de la formación y ocurre por introducción de “fluidos extraños” que causan desequilibrios químicos y físicos en la matriz de la roca y en los fluidos en su interior, lo que reduce la permeabilidad de la formación. La investigación tiene como objetivo: evaluar propiedades de interacción roca-fluido en un proceso de recuperación mejorada, a escala de laboratorio, con inyección de formulación química, en búsqueda de alternativas para el mejoramiento de la producción de petróleo e incremento del factor de recobro de los yacimientos. Se realizaron ensayos de mojabilidad y caracterización física y química de los fluidos inyectados y los efluentes (sólidos totales disueltos, densidad, conductividad, cloruro, calcio, magnesio y pH) antes y después del contacto con la formación. Sobre la base de determinaciones de densidad, contenido de agua y sedimento, asfaltenos y comportamiento reológico, se realizó la caracterización del crudo del pozo Seboruco y también del agua de capa que fue analizada en cuanto su composición iónica y su clasificación. Tales ensayos indicaron un crudo pesado y seudoplástico y el agua de capa del tipo hidrocarbonada sódica. Los ensayos de interacción roca-fluido evidenciaron cambios significativos en la mojabilidad de la roca, de oleohumectada a acuohumectada. Los análisis de los efluentes corroboraron intercambio iónico en el sistema roca-fluido como son: los incrementos de pH y aumento de contenido de cloruro, calcio y magnesio, obtenido al paso de la formulación, que en alguna forma favorecieron al desplazamiento del crudo en el medio poroso.

RESUMO O desastre-crime do petróleo em 2019 é tido como o maior desastre ocorrido no litoral do Brasil. Considerada a primeira linha de enfrentamento de desastres no território, a gestão municipal de saúde é fundamental no processo de gestão de risco de desastre. Objetivou-se analisar a atuação de uma secretaria municipal de saúde da região metropolitana do Recife, Pernambuco, em relação ao derramamento do petróleo ocorrido em 2019. Foi realizado um estudo de caso do tipo descritivo com abordagem qualitativa. Foi realizada Análise de Conteúdo, com utilização do software IRaMuTeQ, das entrevistas com gestores da saúde, cujos resultados revelaram quatro categorias: gestão municipal na atenção com o mar; governança de risco de desastre e suas ausências; sindemia da covid-19 e impactos na reabilitação e recuperação das comunidades afetadas pelo desastre do petróleo; o que fazer se um desastre voltar a acontecer. No município em análise, houve a organização antecipada das ações de enfrentamento, a ausência da governança no desastre-crime e o enfoque da gestão em saúde na sindemia da covid-19, que foram apontados como dificuldades e vulnerabilidades na atuação, enquanto a educação permanente e a articulação com pescadores(as) e marisqueiras foram algumas das lições aprendidas. desastrecrime crime 201 Brasil território Objetivouse Objetivou Recife Pernambuco qualitativa Conteúdo IRaMuTeQ categorias mar ausências covid19 covid 19 covid-1 acontecer análise covid19, 19, pescadoresas pescadores as pescadores(as aprendidas 20 covid1 1 covid- 2

ABSTRACT The 2019 oil disaster-crime is considered the largest disaster on the Brazilian coast. Given the frontline in disaster response, the municipal health secretariat is crucial in the disaster risk management process. This study aimed to analyze the performance of a municipal health secretariat in the metropolitan region of Recife, Pernambuco, regarding the 2019 oil spill, adopting a descriptive, qualitative case study. We performed content Analysis with the IRaMuTeQ software on interviews with health managers, and the results revealed four categories: municipal management in marine care; disaster risk governance and its absence; the COVID-19 syndemic and its impacts on the rehabilitation and recovery of oil disaster-affected communities; what to do if a disaster strikes again. In the municipality under study, we noted early organization of response actions, the lack of governance in the disaster-crime, and health management focus on COVID-19 syndemic, which were identified as difficulties and vulnerabilities in their actions, while continuing education and coordination with fishermen and shellfish gatherers were among the lessons learned. 201 disastercrime crime coast process Recife Pernambuco spill descriptive managers categories care absence COVID19 COVID 19 COVID-1 disasteraffected affected communities again actions disastercrime, crime, learned 20 COVID1 1 COVID- 2

RESUMO Em agosto de 2019, 11 estados brasileiros foram atingidos por um extenso derramamento de petróleo. Nesse contexto, quais os principais impactos socioambientais e psicossociais causados pelo derramamento de petróleo na vida de famílias e indivíduos que vivem da pesca artesanal? Trata-se de uma pesquisa com métodos mistos que utilizou como técnicas: grupo focal e aplicação de formulários desenvolvidos de forma participativa com comunidades da foz do rio Jaguaribe, Ceará, e efetuados entre julho e agosto de 2020. Sua aplicação foi selecionada a partir de uma amostragem não probabilística do tipo intencional por julgamento, cujos dados foram processados com o suporte do software IBM Statistical Package for Social Sciences (SPSS). Os resultados indicam impactos ambientais, como: presença de óleo no rio e em animais; exposição humana direta ao petróleo; sintomas na saúde após exposição; efeitos psicológicos; consumo de recursos alimentares como peixes e crustáceos; e redução da renda dos Pescadores e Pescadoras Artesanais. Assim, compreende-se que a vida, o ambiente, a saúde e o trabalho dessas populações foram agravados, principalmente aqueles de ordens socioeconômicas, de segurança alimentar e hídrica e de saúde. 2019 1 contexto artesanal Tratase Trata se técnicas Jaguaribe Ceará 2020 julgamento SPSS. SPSS . (SPSS) ambientais animais psicológicos crustáceos Artesanais Assim compreendese compreende ambiente agravados socioeconômicas 201 202 (SPSS 20 2

ABSTRACT In August 2019, eleven Brazilian states were hit by an extensive oil spill. In this context: what are the main socio-environmental and psychosocial impacts caused by the oil spill on the lives of families and individuals who make their living from artisanal fishing? This is a research with mixed methods that used the following techniques: focus group and application of forms developed in a participatory manner with communities at the mouth of the Jaguaribe River, Ceará, and applied between July and August 2020. Its application was selected from a non-probabilistic sampling of the intentional type by judgment and was processed with the support of the IBM Statistical Package for Social Sciences (SPSS) software. The results indicate environmental impacts, such as: finding oil in the river and in animals; direct human exposure to oil; health symptoms after exposure; psychological effects; consumption of food resources such as fish and shellfish; and reduction in the income of Artisanal Fishermen and Fisherwomen. That way, it is understood that the lives, environment, health, and work of these populations were aggravated, especially those of socioeconomic, food and water security, and health orders. 2019 context socioenvironmental socio fishing techniques River Ceará 2020 nonprobabilistic non probabilistic SPSS (SPSS software animals effects shellfish Fisherwomen way environment aggravated socioeconomic security orders 201 202 20 2

RESUMO Com o objetivo de analisar os processos de vulnerabilização socioambientais e em saúde das populações expostas ao petróleo bruto, no contexto da pandemia de covid-19 e apresentar caminhos para a reparação integral comunitária, este estudo assumiu uma perspectiva teórico-metodológica ancorada na Abordagem Ecossistêmica em Saúde, na Reprodução Social da Saúde e na Determinação Social da Saúde. Recorreu-se à pesquisa-ação como estratégia para a interação dialógica com os sujeitos dos territórios e construção de experiências emancipatórias na luta por saúde, ambiente e desenvolvimento sustentável. Apresenta-se, de forma geral, o processo de determinação social da saúde das comunidades da pesca artesanal, a promoção de interlocuções comunitária-institucional. Os resultados reforçam a necessidade de estudos no campo da saúde ambiental que alie o conhecimento acadêmico e a sabedoria dos povos das águas à busca por verdade, justiça e reparação. Para tal, é necessário desvelar as injustiças ambientais, o racismo ambiental e os conflitos ambientais, dialogando sobre o modelo de desenvolvimento e o neoextrativismo na sociedade, enquanto importantes desafios e oportunidades para promoção de Territórios Saudáveis e Sustentáveis. bruto covid19 covid 19 covid-1 comunitária teóricometodológica teórico metodológica Recorreuse Recorreu se pesquisaação pesquisa ação sustentável Apresentase, Apresentase Apresenta se, Apresenta-se geral artesanal comunitáriainstitucional. comunitáriainstitucional institucional. institucional comunitária-institucional verdade tal ambientais sociedade Sustentáveis covid1 1 covid-

ABSTRACT This study adopted a theoretical-methodological perspective anchored in the Ecosystem Approach to Health, the Social Reproduction of Health, and the Social Determinants of Health to analyze the socioenvironmental vulnerability and health of populations exposed to crude oil during the COVID-19 pandemic and present pathways for comprehensive community reparation. We employed action research as a strategy for dialogic interaction with the subjects of the territories and the construction of emancipatory experiences in the struggle for health, the environment, and sustainable development. We presented a general outlook on the social determination of the health of small-scale fishing communities and the promotion of community-institutional dialogues. The results reinforce the need for environmental health studies that combine academic knowledge with the wisdom of water peoples in the pursuit of truth, justice, and reparation. To do so, it is necessary to unveil environmental injustice, racism, and conflicts, engaging in dialogue about the development model and neo-extractivism in society as essential challenges and opportunities for promoting Healthy and Sustainable Territories. theoreticalmethodological theoretical methodological COVID19 COVID 19 COVID-1 reparation environment smallscale small scale communityinstitutional institutional dialogues truth justice so injustice racism conflicts neoextractivism neo extractivism Territories COVID1 1 COVID-

Abstract Introduction The forestry sector faces energy challenges that involve the precise determination of the final energy consumption to achieve improvements. Objective To estimate the final energy consumed while processing timber forest resources. Materials and methods The Total Final Consumption (TFC) was determined in six companies (statistical units) engaged in primary timber processing in Pueblo Nuevo, Durango. Activity data and significant energy uses (SEUs) for two years were obtained through an energy audit. The data were disaggregated by statistical unit, activity, form and application of energy, and expressed in tons of oil equivalent (toe). Results and discussion The energy consumption per statistical unit was estimated at 71.19 toe·yr-1, releasing 260.14 tCO2e·yr-1. SEU was identified in vehicles with diesel engines (75 %). The use of gasoline and electrical energy in machines accounted for 14.2 % and 10.7 %, respectively. Electric motors used up to 98 % of the electrical energy. Logging represented 69 % of the Total Final Consumption (TFC), more than twice compared to sawing. Energy consumption was significantly different between statistical units (Tukey, P < 0.05) for sawing, but not for logging. Conclusions Energy consumption for logging was similar among the units studied but was not similar for sawing. An effective energy management program and the integration of wood energy could optimize the consumption pattern.

Resumen Introducción La actividad forestal enfrenta desafíos energéticos que implican la determinación precisa del uso final de energía para lograr mejoras en su rendimiento. Objetivo Estimar la cantidad de energía de uso final consumida durante el procesamiento de los recursos forestales maderables. Materiales y métodos El consumo final total de energía (CFT) se determinó en seis empresas (unidades estadísticas) de transformación primaria de la madera en Pueblo Nuevo, Durango. Los datos de actividad y los usos significativos de la energía (USEn), correspondientes a dos años, se obtuvieron mediante una auditoría energética. Los datos se desagregaron por unidad estadística, actividad, forma y aplicación de la energía y se expresaron en toneladas equivalentes de petróleo (tep). Resultados y discusión El consumo de energía por unidad estadística se estimó en 71.19 tep·año-1, liberando 260.14 tCO2e·año-1. El USEn se identificó en vehículos con motor de diésel (75 %). El uso de gasolina y energía eléctrica en máquinas correspondió al 14.2 % y 10.7 %, respectivamente. Los motores utilizaron hasta 98 % de la energía eléctrica. La extracción de madera ocupó 69 % del CFT, más del doble que el aserrado de madera. El consumo de energía fue significativamente diferente entre unidades estadísticas (Tukey, P < 0.05) durante el aserrado, pero no en la extracción de madera. Conclusiones El consumo de energía en la actividad de extracción de madera fue similar entre las unidades estudiadas, pero no en la etapa de aserrado. Un programa efectivo de gestión de la energía y la integración de la dendroenergía podría optimizar el modelo de consumo.

Abstract: Corn drying reduces the moisture content present in the grain to levels that allow safe storage. This process requires a large amount of energy, which is why, if not applied correctly, it can affect the quality of the product to be dried, in addition to representing important costs in the operation of the drying plants. The objective of this research is to analyze the corn drying systems used in Canton Quevedo, Province of Los Ríos. In order to achieve the objective, field visits were made to the area under study, considering factors related to the technology used and the corn harvesting period, as well as, characteristics of the coastal region of Ecuador. It was determined that stationary or fixed bed drying is the drying system widely used for corn drying, which uses subsidized liquefied petroleum gas as fuel for its operation. The moisture content of the corn received at the drying plants is above 30% in the two harvesting periods of the product, a situation that has an impact on processing times and product quality. The fuel demand for drying an average mass of product of 60.2 tons, between the first harvest period, March - June, and the second period, September - November, presents a difference of 300.77 kg of LPG in relation to the first harvest, being the moisture content a key factor to take into account.

Resumen: El secado del maíz permite reducir el contenido de humedad presente en el grano a niveles que permitan un almacenamiento seguro. El objetivo de esta investigación permite analizar los sistemas de secado de maíz empleados en el Cantón Quevedo, Provincia de Los Ríos. Para alcanzar nuestro objetivo se realizaron visitas de campo en la zona objeto de estudio, por lo que se consideraron factores relacionados con la tecnología empleada y período de cosecha de maíz, características de la región costera del Ecuador. Se determinó que el secado estacionario o de lecho fijo es el sistema de secado ampliamente empleado para el secado de maíz, el cual emplea como combustible el gas licuado de petróleo subsidiado para su funcionamiento. La humedad de recibo de maíz en las plantas de secado presenta niveles de humedad por encima del 30 %, en los dos periodos de cosecha del producto, situación que repercute en los tiempos de proceso y en la calidad del producto. La demanda de combustible para secar una masa promedio de producto, 60,2 Ton, entre el primer período de cosecha que va de Marzo - Junio, y el segundo período, Septiembre - Noviembre, presenta una diferencia de 300,77 Kg de GLP con relación a la primera cosecha, siendo la humedad de recibo un factor clave a tomar en cuenta.

Abstract Liquefied Petroleum Gas (LPG) is a fossil fuel widely used in residential, commercial, and industrial applications. LPG systems must be designed and sized under minimum safety standards, which are established in national and international regulations. An LPG system is composed of fuel storage containers, pipelines, valves, meters, consumption equipment, and protection and safety elements. These must be sized and selected to withstand the action of the fuel gas and the working conditions to which they will be subjected. This document presents a review of the most important points to consider in the design and sizing of an LPG system based on the most representative international regulations.

Resumen El gas licuado de petróleo (GLP) es un combustible de origen fósil ampliamente utilizado en aplicaciones residenciales, comerciales e industriales. Los sistemas de GLP deben diseñarse y dimensionarse bajo estándares mínimos de seguridad, los cuales son establecidos en normativas nacionales e internacionales. Un sistema de GLP está conformado por recipientes de almacenamiento del combustible, tuberías, válvulas, medidores, equipos de consumo y elementos de protección y seguridad. Estos deben ser dimensionados y seleccionados para soportar la acción del gas combustible y las condiciones de trabajo a las que serán sometidos. En este documento se presenta una revisión de los puntos más importantes a tener en cuenta en el diseño y dimensionamientos de un sistema de GLP a partir de las normativas más representativas a nivel internacional.

RESUMEN La presencia de uranio en los reservorios carbonatados de petróleo se ha relacionado con zonas de buena permeabilidad, por la existencia de fracturas abiertas por donde han circulado aguas ricas en sales de uranio. Por otra parte, el uranio se relaciona con la materia orgánica en ambientes reductores. Este trabajo se propone arrojar luz sobre la naturaleza del uranio en los reservorios carbonatados que aparecen en las formaciones gasopetrolíferas cubanas. Para ello se seleccionaron, de la Provincia Gasopetrolífera Norte Cubana, pozos contentivos de estos reservorios que poseyeran registros geofísicos de pozo con imágenes eléctricas de pared de pozo, radiactividad natural de muestras medidas en cámara de bajo fondo y contenido de carbono orgánico total por interpretación de registros de pozo. Se evidenció que la presencia de uranio no puede considerarse un índice directo de permeabilidad al aparecer este asociado lo mismo a fracturas abiertas que cerradas. También se reveló su asociación con la materia orgánica en zonas donde no hay fracturación; de ahí que, en el modelo resultante no pueda ser considerada la presencia de uranio como índice de fracturación y permeabilidad en los carbonatos cubanos. La integración de los datos de los registros geofísicos de pozo convencionales, la herramienta de imágenes de pared de pozo FMI junto a los trabajos de laboratorio, conforma la clave para definir la naturaleza del uranio en los carbonatos.

ABSTRACT Presence of uranium in carbonated petroleum reservoirs has been linked to areas of good permeability, due to the existence of open fractures through which uranium-rich salt waters have circulated. Moreover, uranium is related to organic matter in reducing environments. This paper aims to shed light on nature of uranium in carbonated reservoirs that appear in Cuban gas-controlled formations. For this purpose, wells containing these reservoirs possessing geophysical well logs with electrical images of well wall, natural radioactivity of samples measured in low bottom chamber and total organic carbon content by interpretation of well logs were selected in the North Cuban Petroleum Gas Province. There is evidence that the presence of uranium cannot be considered a direct index of permeability when it appears associated with open fractures as well as closed. It was also showed its association with organic matter in areas where there is no fracturing; hence, in the resulting model, the presence of uranium cannot be considered as index of fracturing and permeability in Cuban carbonates. Integrating data from conventional geophysical well logs, the FMI well wall-imaging tool alongside laboratory work, forms the key to defining the nature of uranium in carbonates.

ABSTRACT Introduction: Cuban crude oil has a high content of ash, sulfur, asphaltenes and a high viscosity, among others, which, when subjected to the combustion process, results in corrosive effects in the heat transfer zones, reducing the useful life of the equipment. Objective: To design a procedure for the introduction of additives, which will increase the useful life of the equipment by improving the energy efficiency of the combustion process. Materials and Methods: It starts from the analysis of the composition and physical-chemical properties of Cuban crude oil and the characterization of the additive. The effectiveness of the additive is evaluated on a laboratory, pilot and industrial scale. The combustion parameters are adjusted and the efficiency of the steam generator is analyzed, with the aim of establishing the required dosage. The corresponding profit/economic cost analysis is carried out. Finally, the procedure is designed to compare with another additive if it exists. Results and Discussion: The procedure includes the determination of the chemical composition and physical-chemical properties of the crude oil used, the effect of the additive and the combustion efficiency. It contemplates not only the analysis of the use of an additive in use, but also the introduction of a new one and the comparison with it. It can be implemented in any industry that uses crude oil as fuel in the combustion process. Conclusions: The procedure provides the methodological indications for the introduction of additives that allow the improvement of the steam generator combustion process.

RESUMEN Introducción: El petróleo crudo cubano tiene un alto contenido de cenizas, azufre, asfaltenos y una alta viscosidad, entre otros, que, al someterse al proceso de combustión, trae como consecuencia efectos corrosivos en las zonas de transferencia de calor, disminuyendo la vida útil de los equipos. Objetivo: Diseñar un procedimiento para la introducción de aditivos, que permitan aumentar la vida útil de los equipos a partir de la mejora de la eficiencia energética del proceso de combustión. Materiales y Métodos: Se parte del análisis de la composición y las propiedades físico-químicas del petróleo crudo cubano y la caracterización del aditivo. Se evalúa la efectividad del aditivo a escala de laboratorio, piloto e industrial. Se ajustan los parámetros de la combustión y se analiza la eficiencia del generador de vapor, con el objetivo de establecer la dosificación requerida. Se realiza el análisis beneficio/costo correspondiente. Por último, el procedimiento tiene concebido la comparación con otro aditivo en caso de que exista. Resultados y Discusión: El procedimiento incluye la determinación de la composición química y las propiedades físico-químicas del petróleo crudo utilizado, el efecto del aditivo y la eficiencia de la combustión. Contempla, no solo el análisis de la utilización de un aditivo en uso, si no también, la introducción de uno nuevo y la comparación con éste. Puede ser implementado en cualquier industria que emplee el petróleo crudo como combustible en el proceso de combustión. Conclusiones: El procedimiento brinda las indicaciones metodológicas para la introducción de aditivos que permitan la mejora del proceso de combustión del generador de vapor.

Resumen: Los asfaltenos son mezclas ultracomplejas que impactan negativamente la refinación, producción y transporte del petróleo. El interés en su estudio abarca desde su caracterización para definir su estructura molecular, hasta la comprensión de su comportamiento interfacial. Los asfaltenos presentan una gran diversidad de grupos funcionales y diferentes tipos de asociaciones como las de tipo no covalentes, enlaces de hidrógeno, complejo de coordinación e interacciones entre núcleos aromáticos paralelos. El objetivo de este trabajo fue analizar la composición presente en asfaltenos extraídos de crudos pesados y extrapesados mediante espectroscopía derivada. Se prepararon soluciones de asfaltenos en el rango de concentración de 20 mg/L a 100 mg/L y se analizaron con espectroscopía UV-Vis. La selección de los espectros de orden cero para el procesamiento se realizó con base en la nitidez presente. Los espectros fueron procesados con OriginPro 8.5, para la obtención de espectros derivados de primer y segundo orden. El procesamiento de los espectros de orden cero fue realizado con los filtros Savitsky-Golay y transformada rápida de Fourier (FFT). Los espectros derivados obtenidos presentaron señales nítidas con presencia de poco ruido, lo que hizo posible la identificación de grupos funcionales aromáticos, de 1 a 4 anillos en el rango de longitudes onda de 200 nm a 450 nm. El uso de filtros mejoró la calidad de las señales y permitió la identificación de componentes y estructuras presentes en asfaltenos. El filtro de Savitsky-Golay incrementó la resolución de los espectros derivados de asfaltenos extraídos de crudos pesados y el filtro FFT de asfaltenos de crudos extrapesados. Se observaron diferencias morfológicas entre los asfaltenos extraídos de crudos pesados y extrapesados mediante SEM, que pueden ser relacionadas con la composición y estructuras aromáticas presentes en asfaltenos.

Abstract: Asphaltenes are ultra-complex mixtures that negatively impact oil refining, production and transportation. The interest in its study ranges from its characterization to define its molecular structure, to the understanding of its interfacial behavior. Asphaltenes present a great diversity of functional groups and different types of associations such as non-covalent ones, hydrogen bonds, coordination complexes and interactions between parallel aromatic nuclei. The objective of this work was to analyze the composition present in asphaltenes extracted from heavy and extra-heavy crude oils using derivative spectroscopy. Asphaltene solutions were prepared in the concentration range of 20 mg/L to 100 mg/L and analyzed with UV-Vis spectroscopy. The selection of zero-order spectra for processing was made based on the sharpness present. The spectra were subsequently processed with OriginPro 8.5, to obtain first and second-order derived spectra. The processing of the zero order spectra was performed with the Savitsky-Golay and Fast Fourier transform (FFT) filters. The derived spectra obtained presented clear signals with the presence of little noise, which made possible the identification of aromatic functional groups, from 1 to 4 rings in the wavelength range of 200 nm to 450 nm. The use of filters improved the quality of the signals and allowed the identification of components and structures present in asphaltenes. The Savitsky-Golay filter increased the resolution of the spectra derived from asphaltenes extracted from heavy crude oils and the FFT filter increased the asphaltenes extracted from heavy crude oils. Morphological differences between asphaltenes extracted from heavy and extra-heavy crude oils were observed by SEM, which maybe related to the composition and aromatic structures present in asphaltenes.

Abstract: Eryngium horridum, is a plant species that has had studies as a weed, but with little information within the context of phytochemical investigations or biological activities of the same, but the genus Eryngium. This species is used in popular medicine as an anti-inflammatory infusion, especially the roots and leaves. The objective of this work was to trace the phytochemical profile of the root extract of the species Eryngium horridum Malme, which is found in the department of Cordillera, Paraguay, also evaluating its efficacy against specific bioassays looking for its pharmacological potential. For this, the roots were dried, crushed and subjected to maceration with 96% ethanol. Then the phytochemical profile of the crude extract and the soluble fractions in different solvents (petroleum ether, dichloromethane, acetone and methanol) was carried out, the chromatographic profile was carried out in GC-MS, the total phenols and biological activity as antimicrobial activity, antioxidant and hemolytic. According to the results obtained, the presence of compounds such as aldehydes, phenols, lactones, among others, was verified. The fraction soluble in acetone (E3) showed a value of 160.6 mg GAE.g-1 of total phenols. Regarding the biological activities, inhibitory capacity was shown against 9 of the 10 strains used, whose highest percentage of activity was 70.10% with Pseudomonas aeruginosas, an antioxidant power of 20.49% with the DPPH method, and a hemolytic activity of 97.8% in the acetone-soluble fraction (E3). We can conclude that the species studied presents secondary metabolites, antimicrobial, antioxidant and hemolytic activity.

Resumen: Eryngium horridum, es una especie vegetal que ha tenido estudios como maleza, pero con escasa información dentro del contexto de investigaciones fitoquímicas o actividades biológicas de la misma, pero si del género Eryngium. Esta especie es utilizada en la medicina popular como antiinflamatoria en infusión, especialmente las raíces y hojas. El objetivo de este trabajo fue trazar el perfil fitoquímico del extracto de raíces de la especie Eryngium horridum Malme, que se encuentra en el departamento de Cordillera, Paraguay, evaluando además su eficacia frente a bioensayos específicos buscando su potencial farmacológico. Para ello, se secaron las raíces, se trituraron y sometieron a maceración con etanol al 96%. Luego se llevó a cabo el perfil fitoquímico del extracto crudo y de las fracciones solubles en diferentes solventes (éter de petróleo, diclorometano, acetona y metanol), se realizó el perfil cromatográfico en GC-MS, los fenoles totales y actividad biológica como actividad antimicrobiana, antioxidante y hemolítica. Según resultados obtenidos, se verificó la presencia de compuestos como aldehídos, fenoles, lactonas, entre otros. La fracción soluble en acetona (E3) mostró un valor de 160,6 mg GAE.g-1 de fenoles totales. En cuanto a las actividades biológicas, se mostró capacidad inhibitoria ante 9 de las 10 cepas utilizadas, cuyo mayor porcentaje de actividad fue de 70,10% con la Pseudomonas aeruginosas, un poder antioxidante de 20,49% con el método de DPPH, y una actividad hemolítica de 97,8% en la fracción soluble en acetona (E3). Podemos concluir que la especie estudiada presenta metabolitos secundarios, actividad antimicrobiana, antioxidante y hemolítica.

Abstract This study delves, from a qualitative perspective, into various aspects surrounding the expansion of the Vaca Muerta megaproject located in the North Patagonian region of Argentina. Specifically, it explores the transformations in Añelo, a town at the epicenter of unconventional hydrocarbon extraction activities in the province of Neuquén. The analysis focuses on the repercussions of population growth, the influx of people, and the emergence of new economic activities. These factors have heightened concerns about insecurity, instances of violence, and environmental risks, shaping the trajectory of the town’s development. While there are some parallels with other extractive enclaves, the rapid pace of transformation and territorial interventions underscore a dynamic that gains momentum and intensity with the implementation of fracking technique for gas and oil extraction.

Resumen Este trabajo indaga, desde una perspectiva cualitativa, en una serie de procesos relacionados con el crecimiento del megaproyecto de Vaca Muerta ubicado en la zona Norpatagónica de la Argentina. Se enfoca particularmente en los cambios ocurridos en Añelo, una localidad de la provincia de Neuquén ubicada en el centro de la actividad de extracción de hidrocarburos no convencionales. Para ello, se analiza cómo los incrementos de población, de circulación de personas, de nuevas actividades económicas, de requerimientos de servicios educativos y de salud, el aumento del sentimiento de inseguridad, de situaciones de violencia y riesgos ambientales, han singularizado el desarrollo de esta localidad. Aunque algunos aspectos resultan comunes respecto a otros enclaves extractivos, el proceso acelerado de transformación e intervención sobre los territorios coloca la atención sobre una dinámica que adquiere velocidad y contundencia con la extracción de gas y petróleo a través de la técnica del fracking.