Abstract (Introduction): Vinasse is generated as a residue in the production of ethanol by fermentation-distillation of molasses/sugar cane juice, at a rate of 13 L/L of ethanol. It is an acid liquid, brown in color, characterized by high mineralization and Chemical Oxygen Demand (COD) values of up to 150 000 mg/L, being highly polluting. (Objective): The objective of this research was to evaluate a vinasse treatment process with hydrogen peroxide as a source of hydroxyl radicals at laboratory scale. (Methodology): The vinasse samples, from different distilleries in the province of Tucumán, were characterized following standardized techniques of Standard Methods. The oxidation tests were carried out with different peroxide/vinasses ratios, in a semi-batch reactor, under ambient conditions, measuring COD as an indicator parameter of the treatment. (Results): After 5 days, an 85 % decrease in COD and an increase in the Biodegradability Index were achieved. The kinetics of the oxidative reaction was first order with respect to COD, with an apparent rate constant of 0.3694 1/day. (Conclusions): Although the COD values allowed by local regulations (250 mg/L) were not reached, the proposed treatment is encouraging due to its simplicity, representing a potential option to the environmental challenge represented by vinaze in Latin America.

Resumen (Introducción): La vinaza se genera como residuo en la producción de etanol por fermentación-destilación de melazas/jugos de caña de azúcar, a razón de 13 L/L de etanol. Es un efluente líquido, ácido caracterizado por una elevada mineralización y valores de demanda química de oxígeno (DQO) de hasta 150 000 mg/L, siendo altamente contaminante. (Objetivo): Ealuar un proceso de tratamiento de vinazas con peróxido de hidrógeno, como fuente de radicales hidroxilos, en escala laboratorio. (Metodología): Las muestras de vinazas, de destilerías de la provincia de Tucumán, se caracterizaron según técnicas normalizadas de Standard Methods. Los ensayos de oxidación se realizaron con distintas relaciones de peróxido/vinaza, en un reactor semibatch, en condiciones ambientales, midiendo DQO como parámetro indicador del tratamiento. (Resultados): Al cabo de cinco días se logró una disminución de DQO del 85 % y un aumento del Índice de Biodegradabilidad. La cinética de la reacción oxidativa fue de primer orden respecto de DQO, con una constante aparente de velocidad de 0.3694 1/día. (Conclusiones): Si bien no se lograron los valores de DQO permitidos por la normativa local (250 mg/L), el tratamiento propuesto es alentador por su simpleza, representando una opción potencial al desafío ambiental que representan las vinazas en América Latina.

Even though ammonia is a natural component of aquatic environments, elevated concentrations indicate pollution and environmental degradation. Consequently, efficient analytical methods for monitoring ammonia levels are crucial for preserving water quality. Voltammetry offers a sustainable approach for NH3 quantification, combining good analytical performance with low sample and reagent consumption, minimizing waste generation. However, despite these advantages, the voltammetric determination of ammonia remains relatively unexplored. Therefore, this study investigated the electrochemical behavior of NH3 in alkaline solutions using a non-modified Pt electrode and evaluated the performance of differential pulse voltammetry (DPV) and square wave voltammetry (SWV) for NH3 determination. DPV provided superior performance, with limits of detection and quantification of 0.79 µmol L-1 (0.011 ppmN) and 2.6 µmol L-1 (0.036 ppmN), respectively, which comply with the maximum allowable ammonia concentration in natural waters according to Brazilian and European regulations. The voltammetric method successfully quantified ammonia in tap and river water samples, providing results concordant with the established Berthelot spectrophotometric method, at a 95% confidence level. Additionally, it is simple and fully accessible to non-electrochemist since no sophisticated procedures for electrode modification are needed. Finally, the high analytical performance of the proposed method makes it valuable for pollution monitoring in aquatic environments. environments degradation Consequently quality NH consumption generation However advantages unexplored Therefore nonmodified non modified (DPV SWV (SWV 079 0 79 0.7 L1 L 1 L- 0.011 0011 011 (0.01 ppmN 26 2 6 2. 0.036 0036 036 (0.03 ppmN, , respectively regulations samples 95 level Additionally nonelectrochemist electrochemist needed Finally 07 7 0. 0.01 001 01 (0.0 0.03 003 03 9 0.0 00 (0. (0 (

Abstract For the understanding of the shear behavior of steel fiber reinforced concrete beams without stirrups (shear reinforcement), beams were experimentally studied employing bending tests. The analyzed parameters were two classes of compressive strength (30 MPa and 45 MPa) and three dosages of fibers (40 kg/m³, 60 kg/m³ and 80 kg/m³), in addition to the reference trace. An analytical comparison of the experimental results with calculation models from normative regulations and scientific papers was studied to predict the failure force of the beams. The results showed gains in the ultimate shear strength provided by steel fibers, evidencing their great potential against shear stress. The failure mode of the beams was not altered for the dosages of fibers and compressive strength classes studied. However, higher load and deformation capacity was evidenced with an increasing number of fibers and f c . The model from Brazilian regulation NBR 16935 (ABNT, 2021a) showed excellent results in predicting the failure force of the beams in group C30. reinforcement, reinforcement , reinforcement) tests 30 (3 4 40 (4 kgm³ kgm kg m³ m 6 kg/m 8 kg/m³) trace stress However 1693 ABNT, ABNT (ABNT 2021a a C30 C 3 ( 169 C3 16 1

Resumo Para o entendimento do comportamento ao cisalhamento de vigas de concreto reforçadas com fibras de aço e sem a utilização de estribos, foram estudadas experimentalmente vigas por meio de ensaios de flexão. Os parâmetros analisados foram duas classes deresistência à compressão (30MPa e 45MPa) e três quantidades de fibras (40kg/m³, 60kg/m³ e 80kg/m³), além de um traço de referência. Uma comparação analítica dos resultados experimentais com modelos de cálculos de regulamentações normativas e de trabalhos científicos foi estudada para a previsão da força de ruína das vigas. Os resultados experimentais demonstraram ganhos na resistência última ao cisalhamento proporcionado pelas fibras de aço, evidenciando seu grande potencial frente ao esforço de cisalhamento. O modo de ruína das vigas não foi alterado para as quantidades de fibras e classes de resistência estudadas. Porém, maior capacidade de carga e de deformação foi evidenciada com o aumento da quantidade de fibras e do fck. O modelo da norma brasileira NBR 16935 (ABNT, 2021a) mostrou excelente resultado na previsão da força de ruína das vigas do grupo C30. estribos flexão 30MPa MPa 45MPa 40kg/m³, 40kgm³ kgm 40kg m³ kg m (40kg/m³ 60kgm³ 60kg 60kg/m 80kg/m³, 80kgm³ 80kg/m³ , 80kg 80kg/m³) referência Porém fck 1693 ABNT, ABNT (ABNT 2021a C30 C 40kg/m³ 40kgm (40kg/m 60kgm 80kgm 80kg/m 169 C3 40kg/m 16 1

Resumo A produção de tintas utilizando resíduos de beneficiamento de granito e mármore é uma nova alternativa para contribuir com o desenvolvimento sustentável na construção civil. Entretanto, a carência de estudos sobre a composição e o desempenho dessas tintas inviabiliza a disseminação desse novo material de construção. Logo, este estudo tem como objetivo investigar a composição dessas tintas utilizando ferramentas estatísticas para obter produtos com desempenho compatível com regulamentações técnicas e tintas comerciais. As formulações de tintas foram definidas através de um planejamento de misturas quaternárias. O teor de sólidos, pH, viscosidade, poder de cobertura e resistência à abrasão foram determinados para todas as amostras. As tintas produzidas com resíduos de granito apresentaram melhor poder de cobertura e resistência à abrasão, pois o resíduo de granito apresenta granulometria mais fina, além de ser predominantemente composto por sílica. Por fim, as tintas produzidas neste estudo e as tintas comerciais apresentaram comportamento semelhante, o que corrobora com o aproveitamento do resíduo do processamento de rochas ornamentais na produção de tintas. civil Entretanto Logo quaternárias sólidos pH viscosidade amostras fina sílica fim semelhante

Abstract The production of paints using waste from granite and marble processing is a new alternative to contribute to sustainable development in civil construction. However, the lack of studies on the composition and performance of these paints makes the dissemination of this new construction material unfeasible. Therefore, this study aims to investigate the composition of these paints using statistical tools to obtain products with performance compatible with technical regulations and commercial paints. The paint formulations were defined through a quaternary mixture planning. The solids content, pH, viscosity, hiding power, and abrasion resistance were determined for all samples. The paints produced with granite waste showed better hiding power and abrasion resistance, as granite waste has a finer granulometry, in addition to being predominantly composed of silica. Finally, the paints produced in this study and the commercial paints showed similar behavior, which supports the use of waste from the processing of ornamental rocks in paint production. However unfeasible Therefore planning content pH viscosity samples granulometry silica Finally behavior

ABSTRACT The term 'stealthing' refers to non-consensual condom removal during sexual intercourse. This practice carried out against the will of the person who agreed to engage in sexual intercourse under specific modalities, such as the use of a condom, which, in turn, translates to a disruption in the consent. This article argues that in Chile the deficient regulation of sexual and reproductive rights wouldn't allow the bill about the non-consensual removal of the condom in a sexual intercourse respond to this phenomenon and its normalization. To develop this idea, has been reviewed the legal and jurisprudential situation of countries such as the United Kingdom, New Zealand, Germany, Netherlands, United States, Costa Rica and Colombia, as well as the pronouncement of international law on the sexual and reproductive rights. The article concludes that the lack of regulations on these rights encourages the normalization of sexually abusive behavior.

RESUMEN El término stealthing designa al retiro no consentido del preservativo durante una relación sexual. Esta práctica es realizada ante la negativa o con el desconocimiento de quien consintió tener relaciones sexuales bajo condiciones específicas, como el uso de condón, lo cual genera un quiebre en el consentimiento. Este artículo argumenta que en Chile la deficiente regulación de los derechos sexuales y reproductivos no permitiría que el proyecto de ley que busca sancionar la remoción no consentida del condón en una relación sexual dé respuesta a este fenómeno y su normalización. Para desarrollar esta idea se ha revisado tanto la situación normativa como la jurisprudencial de países como Reino Unido, Nueva Zelanda, Alemania, Países Bajos, Estados Unidos, Costa Rica y Colombia, al igual que el pronunciamiento del derecho internacional sobre los derechos sexuales y reproductivos. El artículo concluye que la falta de normativa sobre estos derechos insta a la normalización de conductas atentatorias contra la sexualidad y la reproducción.

ABSTRACT In Colombia, labour law seeks to prevent and punish harassment at work, understood as "persistent and demonstrable" conduct with the purpose of undermining the dignity of the worker. Likewise, criminal law criminalises sexual harassment, understood as the act of using one's superiority for non-consensual sexual purposes. This criminal offence seeks to protect freedom, integrity and sexual training. This article analyses, using a gender perspective, the fragmentation that has occurred so far as a result of this double regulation in scenarios of sexual harassment in the workplace and which the Congress of the Republic seeks to remedy with the issuing of Act 2365, 2024. We present six tensions or points in common between labour and criminal regulations. We conclude the article by proposing three lines of research: (1) on the barriers to access to justice for sexual harassment, (2) to continue feminist dogmatic research and (3) on the forms of control in labour settings.

RESUMEN En Colombia, el derecho laboral busca prevenir y sancionar el acoso laboral, entendido como una conducta "persistente y demostrable" con el propósito de cercenar la dignidad del trabajador. Asimismo, el derecho penal tipifica el acoso sexual, comprendido como el hecho de querer valerse de la superioridad con fines sexuales no consentidos. Este tipo penal busca proteger la libertad, la integridad y la formación sexual. Este artículo analiza, utilizando una perspectiva de género, la fragmentación que se ha presentado hasta ahora a raíz de esta doble regulación en escenarios de acoso sexual laboral y que el Congreso de la República busca subsanar con la expedición de la Ley 2365 de 2024. Presentamos seis tensiones o puntos en común entre las regulaciones laborales y penales. Concluimos el artículo proponiendo tres líneas de investigación: (1) sobre las barreras de acceso a la justicia del acoso sexual, (2) continuar la investigación dogmática feminista y (3) sobre las formas de control en escenarios laborales.

RESUMEN La Sentencia 1364-17-EP/23 de la Corte Constitucional aparentemente cerró la discusión sobre el alcance del art. 233 de la CRE en lo que respecta al peculado. Se afirma serían autores tanto servidores públicos como sujetos que no ostenten esta condición, independientemente de sus conductas. La resolución es insatisfactoria. En la misma no se confrontó si el contenido del precepto constitucional era suficiente para cumplir con la determinación que requiere la tipificación de una conducta. El debate no puede cerrarse sin alcanzar estos niveles de análisis. El objetivo de este artículo es desafiar esta decisión, presentando argumentos que no fueron considerados, y a través de estos, cuestionar las conclusiones alcanzadas. Desde la explicación de lo que es un intraneus y un extraneus, se plantea otras formas de interpretar el art. 233. Entre las alternativas, se selecciona la que se cree que guarda armonía con todo el sistema de normas. El art. 233 fija la necesidad de que en el peculado se sancione como autores a no servidores públicos y a privados, pero no es suficiente para ser aplicado directamente. Es el principio de legalidad el que cumple con el mandato de determinación. Finalmente, se resalta que la norma penal sí contempla supuestos donde pueden intervenir como autores personas sin la calidad de servidores públicos, casos en los que existe certeza sobre la conducta prohibida.

ABSTRACT Sentence 1364-17-EP/23 of Constitutional Court and article 233 of the CRE regarding embezzlement seems to be closed. It is stated that both public servants and the ones who do not hold this condition can be authors regardless of their conduct. The resolution is not acceptable as it did not confront whether the content of the constitutional precept was sufficient to comply with the determination required to classify a conduct. The debate cannot be closed without reaching these levels of analysis. The aim of this article is to challenge this decision with arguments that were not considered and can be used to question the conclusions reached. From the explanation of what an intraneus and an extraneus are, other ways of interpreting article 233 are proposed. Among the alternatives, the selected is the one that is believed to be in harmony with the entire system of regulations. Article 233 establishes the need to sanction to non-public and private servants as perpetrators of embezzlement. However, it is not enough to be applied directly. It is the principle of legality that fulfills the mandate of determination. Finally, it is highlighted that the criminal law does contemplate cases where people without the status of public servants may intervene as perpetrators, cases in which there is certainty about the prohibited conduct.

RESUMEN En el presente artículo se plantea exponer la difícil situación legal de la privación de libertad y los traslados a distintos centros de privación de libertad. Para ello, es necesario verificar las teorías de la pena que nuestro ordenamiento jurídico pretende seguir, lo que permitirá saber las razones de la normativa expedida en materia de garantías penitenciarias. Así también, conocer el estado normativo de los traslados y su relación inmediata con el hábeas corpus. Camino que se pretende seguir entre la supuesta desnaturalización de garantías jurisdiccionales y la ausencia de un control judicial. De igual forma, plantear la relación que existe sobre los traslados y otros conflictos carcelarios como el hacinamiento, la violencia, la falta de personal penitenciario y que tiene incidencia en varios derechos constitucionales como la unidad familiar, derecho a la defensa, entre otros. Finalmente, se buscan posibles salidas a la problemática que acarrean los traslados de personas privadas de libertad, de manera especial sobre la contradicción entre el art. 668.2 del Código Orgánico Integral Penal que impide realizar traslados a través de una garantía jurisdiccional y la sentencia de la Corte Constitucional n.º 365-18-JH/21 y acumulados (Integridad personal de personas privadas de libertad) que habilita la posibilidad de realizarlo en casos de afectación al derecho a la integridad personal.

ABSTRACT I plan to expose the difficult legal situation of deprivation of liberty and transfers to different deprivation of liberty centers. To do this, it is necessary to verify the theories of punishment that our legal system intends to follow, which will allow us to know the reasons for the regulations issued regarding penitentiary guarantees. Likewise, know the regulatory status of transfers and their immediate relationship with habeas corpus. The path that is intended to be followed between the supposed denaturalization of jurisdictional guarantees and the absence of judicial control. Likewise, raise the relationship that exists on transfers and other prison conflicts such as overcrowding, violence and lack of prison staff and that has an impact on several constitutional rights such as family unity, the right to defense, among others. Finally, possible solutions are sought to the problems caused by the transfers of people deprived of liberty, especially on the contradiction between article 668.2 of the COIP that prevents transfers through a jurisdictional guarantee and the sentence of the Court Constitutional n.º 365-18-JH/21 and accumulated (Personal integrity of persons deprived of liberty) that enables the possibility of carrying it out in cases of impact on the right to personal integrity.

Abstract This study examines conversations with X user positions in Mexico about ultra-processed foods, which have recently been linked to obesity. Posts from 2019 and 2020 were identified through hashtags on the topics of "labeling," "ultra-processed," and "junk food." We used a mixed approach to identify word patterns and develop an analysis based on social network theory. We found 211,585 tweets and 904,484 retweets from 90,828 and 321,637 accounts, respectively. There was an emphasis on conversations during the legislative process, especially the hashtag #etiquetadoclaroya. The most intense interactions occurred in discussions about new front-of-package warnings. The most influential profiles belonged to the media, academia, and civil society. The food industry's involvement was limited, so its role in the debate is inconclusive. This method can be used in other countries to monitor discussions on regulations and other policies.

Resumen Este estudio examina conversaciones con posturas de usuarios de X en México acerca de los productos comestibles ultraprocesados, recientemente asociados con obesidad. Se identificaron publicaciones en 2019 y 2020 a través de hashtags en temáticas denominadas "etiquetado", "ultraprocesados" y "comida chatarra". Se utiliza un enfoque mixto para identificar patrones de palabras y desarrollar un análisis basado en la teoría de redes sociales. Se encontraron 211,585 tweets y 904,484 retweets de 90,828 y 321,637 cuentas, respectivamente. Hubo un énfasis en las conversaciones durante procesos legislativos, destacando el hashtag #etiquetadoclaroya. Las interacciones más intensas ocurrieron en las discusiones sobre un nuevo etiquetado de advertencia. Los perfiles más influyentes pertenecían a medios de comunicación, academia y sociedad civil. La participación de la industria alimentaria fue limitada, por lo que su papel en el debate no es concluyente. Este método puede usarse en otros países para monitorear la discusión de regulaciones o políticas.

ABSTRACT Unhealthy diets, preventable risk factors for noncommunicable diseases (NCDs), pose a growing challenge that coexists with pre-existing and persistent malnutrition problems. These also coexist and interact synergistically with climate change dynamics, which threaten the sustainability of food systems, and are silently intersected by gender dynamics. States have adopted measures to address these issues, including regulations to promote healthy diets and prevent food loss and waste. However, state responses to problems with frequently common causes are often adopted in a fragmented manner, with elements that are contradictory to each other and the human rights framework. This paper presents the aforementioned discussions by comparing regulatory initiatives from three countries, Colombia, Chile, and Argentina, analyzing their internal compatibility and alignment with the international human rights framework. Finally, it proposes ideas to reconcile the diverse agendas from a comprehensive perspective.

RESUMEN Las dietas malsanas, factores de riesgo prevenibles de enfermedades no transmisibles (ENT), constituyen un reto creciente, que coexiste con problemas preexistentes y persistentes de desnutrición. Éstos, además, conviven e interactúan sinérgicamente con dinámicas de cambio climático, que amenazan la sostenibilidad de los sistemas alimentarios, y son atravesadas silenciosamente por dinámicas de géneros. Los Estados han adoptado medidas para abordar estas problemáticas, entre ellas, normas para promover la alimentación saludable y prevenir la pérdida y desperdicios de alimentos. No obstante, las respuestas estatales a problemas cuyas causas son frecuentemente comunes se adoptan de manera fragmentada, con elementos contradictorios entre sí y con el marco de derechos humanos. El presente trabajo presenta las anteriores discusiones comparando las iniciativas regulatorias de tres países, Colombia, Chile y Argentina, analizando su compatibilidad hacia el interior y el marco internacional de derechos humanos. Finalmente, plantea ideas disparadoras para reconciliar las diversas agendas desde una mirada integral.

Summary: The municipality of Medellín, Veracruz, México has a type A landfill, whose operation level has recently increased due to landfill closure in the city of Veracruz. The objective of this study is to analyze and evaluate the quality of groundwater surrounding the landfill of the municipality of Medellín., such as hydrogen potential (pH), electrical conductivity (EC), turbidity (T), chemical oxygen demand (COD), total phosphorus (TP), nitrates (NO3 -), total dissolved solids (TDS) and heavy metals Lead (Pb), cadmium (Cd) and copper (Cu) in seven groundwater wells near the landfill during the “north” and dry season. The physicochemical water results from the seven wells analyzed were within the maximum permissible limits of Mexican regulations: turbidity values exceeded international regulations and four wells were found contaminated according to COD levels. The concentrations of Pb and Cd in both seasons were higher than the maximum permissible limits for human consumption in accordance with national and international regulations. Therefore, the results indicated the negative influence of the landfill on groundwater quality.

Resumen: Los rellenos sanitarios se han vuelto una fuente de contaminación de aguas superficiales y subterráneas, debido a la generación de lixiviados que pueden llegar hasta los cuerpos de agua con efectos adversos al ambiente. El municipio de Medellín, Veracruz, México; cuenta con un relleno sanitario tipo A cuyo nivel de operación se ha incrementado recientemente debido a la clausura del relleno sanitario de la ciudad de Veracruz. El objetivo del presente estudio fue analizar la calidad del agua subterránea aledaña al relleno sanitario del municipio de Medellín. Se evaluaron potencial de hidrógeno (pH), conductividad eléctrica (CE), turbidez (T), Demanda Química de Oxigeno (DQO), Fósforo Total (PT), Nitratos, (NO3 -), Sólidos Disueltos Totales (SDT) y metales pesados Plomo (Pb), Cadmio (Cd) y Cobre (Cu) en 7 pozos de agua subterránea próximos al relleno sanitario durante la temporada de “nortes” y estiaje. Los resultados fisicoquímicos del agua de los 7 pozos analizados se encontraron dentro de los límites máximos permisibles de la normatividad mexicana; los valores de turbidez superaron la normatividad internacional y 4 pozos mostraron estar contaminados de acuerdo a los niveles de DQO. Las concentraciones de Pb y Cd en ambas temporadas se encontraron superiores a los límites máximos permisibles para consumo humano de acuerdo con la normatividad nacional e internacional. Los resultados indicaron la influencia negativa del relleno sanitario en la calidad del agua subterránea.

RESUMEN El objetivo de este trabajo consiste en valorar críticamente el modo en que se emplean los términos clave que describen el contenido conceptual y la práctica legislativa de la participación de los trabajadores en la dirección en las organizaciones estatales cubanas, y que aparecen en las principales disposiciones normativas que conforman el derecho de trabajo, el sistema legal empresarial y los documentos programáticos que contienen las estrategias socioeconómicas en Cuba, en su proyección hasta el 2030. Se realizó un estudio observacional descriptivo transversal a partir de procedimientos bibliométricos y el análisis comparativo de los principales documentos regulatorios y normativos enunciados anteriormente. Se evidenció que existe un amplio, multifacético, contextualizado y diferenciado tratamiento de los principales aspectos teóricos, que conforman el «deber ser» de la participación de los trabajadores en la dirección de las organizaciones estatales cubanas. El estudio bibliométrico y análisis comparativo de los textos utilizados permitió constatar que, a pesar de las diferencias económicas, sociopolíticas e ideológicas que existen, se observa cierta coincidencia en el tratamiento del término clave «participación de los trabajadores» que propone el sistema legal y normativo cubano y aquel que plantea la bibliografía especializada a nivel mundial sobre el tema.

ABSTRACT This paper’s purpose is to assess critically the use of key terms operated to describe the conceptual content and normative practice in Cuba’s state organization management of worker’s participation, which appear in main regulatory documents that form labor law regulations. Also in Enterprise’ legal system and programmatic documents that contain the socioeconomic strategies in Cuba in their projection until 2030. It was performed a cross-sectional, descriptive observational study based on bibliometric and comparative analysis of the main regulatory and normative documents stated above. It was evident that there is a broad, multifaceted, contextualized and differentiated treatment of the main theoretical aspects that make up the «duty» of workers' participation in Cuban state organizations management. The comparative analysis allowed stating the fact that besides of the economic, sociopolitical and ideological differences, there is a certain match on the «worker’s participation» keyword treatment provided by the legal and normative Cuban system and the specialized world-level bibliography that studies the subject.

Abstract: The use of e-commerce to enhance consumer relationships is becoming increasingly important in the information society. The constant development of technologies allows existing platforms to benefit from their characteristics; however, these advancements also bring various legal issues that must be addressed to protect users' interests and rights. Blockchain technology is revolutionizing B2C electronic relations due to its transnational nature, decentralization, guarantee of trust, immutability, and one of its most distinctive functionalities: smart contracts. These agreements are characterized by their automation and self-execution, features that can conflict with existing consumer and user legislation. Additionally, the opportunities provided by Blockchain, such as allowing users to act anonymously, may contradict regulations concerning the determination of international judicial jurisdiction and the applicable law for B2C consumer legal relationships. This work aims to analyze the applicability of smart contracts in e-commerce, particularly for B2C companies, and to study the potential issues they pose for current regulations, in order to determine whether these regulations need to be adapted for these technologies

Resumen: El uso del comercio electrónico para celebrar relaciones de consumo cada vez toma más protagonismo en la sociedad de la información. El constante desarrollo de las tecnologías hace que las plataformas existentes puedan beneficiarse de sus características; sin embargo, también traen consigo diferentes cuestiones jurídicas que deben mitigarse a fin de proteger los intereses y derechos de los usuarios. La tecnología blockchain es una de las tecnologías que viene a revolucionar el ámbito de las relaciones electrónicas B2C gracias a su carácter transnacional, descentralización, garantía de confianza, inmutabilidad y a una de sus funcionalidades más características: los smart contracts. Este tipo de acuerdos se distinguen por su automatización y autoejecución, caracteres que a priori pueden poner en riesgo la legislación existente sobre consumidores y usuarios. Asimismo, las oportunidades que brinda blockchain de cara a que los usuarios puedan actuar de forma irreconocible puede poner en jaque la normativa encargada de determinar la competencia judicial internacional y la ley aplicable a las relaciones jurídicas de consumo B2C. Este trabajo analiza la aplicabilidad de los smart contracts en el ámbito del comercio electrónico, en especial en el de empresas con consumidores (B2C) y estudiar los posibles inconvenientes que generan sobre la normativa existente a fin de analizar si es necesario adaptar la legislación a estas tecnologías

Resumo: A utilização do comércio eletrônico para efetivar relações de consumo assume cada vez mais um papel central na sociedade da informação. O constante desenvolvimento das tecnologias faz com que as plataformas existentes possam beneficiar-se das suas características, no entanto, também trazem consigo diversas questões jurídicas que devem ser mitigadas de forma a proteger os interesses e direitos dos usuários. A tecnologia blockchain é uma das tecnologias que veio revolucionar o campo das relações eletrônicas B2C graças ao seu carácter transnacional, descentralização, garantia de confiança, imutabilidade e uma das suas funcionalidades mais características, os smart contracts. Estes tipos de acordos distinguem-se pela sua automatização e auto-execução, características que, a priori, podem colocar em risco a legislação existente sobre consumidores e usuários. Da mesma forma, as oportunidades que o Blockchain oferece para que os usuários possam agir de forma irreconhecível podem colocar em xeque os regulamentos encarregados de determinar a competência judicial internacional e a lei aplicável às relações jurídicas de consumo B2C. O objetivo deste trabalho é analisar a aplicabilidade dos smart contracts no campo do comércio eletrônico, especialmente o de empresas com consumidores (B2C) e estudar os possíveis inconvenientes que eles geram sobre a regulamentação existente, a fim de analisar se é necessário adaptar a legislação a estas tecnologias

Resumen:La demanda creciente del sector vivienda en la ciudad de Machala-Ecuador convirtió a las invasiones en el modelo común de crecimiento desorganizado de esta ciudad, donde utilizan el estero “El Macho” para la eliminación de desechos y aguas negras. Estudios preliminares respecto al contenido de metales pesados en este estero concluyen que las concentraciones de metales como el cadmio son superiores a los límites establecidos en la normativa del Texto Unificado de Legislación Secundaria del Ministerio del Ambiente. En la presente investigación se evaluó la remoción de cadmio de muestras de aguas del estero “El Macho” utilizando espuma de poliuretano activada con nanopartículas de plata como adsorbente. Para la recolección de los datos de adsorción se diseñó de un reactor tubular vertical, utilizando 1,560 g de adsorbente de poliuretano modificado con nanopartículas de plata, pH 8 y tamaño de la espuma de poliuretano de forma cubica de 0,5 cm de lado. Se cuantificó las concentraciones de cadmio mediante espectroscopia de absorción atómica, en muestras de aguas del Estero antes y después de su paso por el reactor. Se concluye que la espuma de poliuretano activada con nanopartículas de plata, como adsorbente, alcanzó un porcentaje de remoción de 48,75% y, por lo tanto, es efectivo para el tratamiento de aguas contaminadas con cadmio.

Abstract:The growing demand of the housing sector in the city of Machala-Ecuador turned invasions into the common model of disorganized growth of this city, where they use the “El Macho” estuary for the disposal of waste and sewage. Preliminary studies regarding the content of heavy metals in this estuary conclude that the concentrations of metals such as cadmium are higher than the limits established in the regulations of the Unified Text of Secondary Legislation of the Ministry of the Environment. In the present investigation, the removal of cadmium from water samples of the “El Macho” estuary was evaluated using polyurethane foam activated with silver nanoparticles as an adsorbent. To collect adsorption data, a vertical tubular reactor was designed, using 1,560 g of polyurethane adsorbent modified with silver nanoparticles, pH 8 and cubic-shaped polyurethane foam size of 0.5 cm of side. Cadmium concentrations were quantified by atomic absorption spectroscopy in samples of Estero water before and after passing through the reactor. It is concluded that the polyurethane foam activated with silver nanoparticles, as an adsorbent, reached a removal percentage of 48.75% and therefore, it is effective for the treatment of water contaminated with cadmium.

My enrolment at university was a significant milestone in my life. During my first three days as a student with autism spectrum disorder, I experienced both positive and negative situations at different campuses, including overcrowded lecture halls, residences, faculty houses, and interacting with other students. My literature review and theoretical interpretation are guided by historical institutionalism and Bakhtin's concept of "outsideness". These frameworks address how historical events shape the social, political, and economic behaviour of institutions in a system that treats new students who must adapt to the university's rules, regulations, and traditions as outsiders. The frameworks mentioned above were used to understand what I experienced during my first three days at university, which set the tone for the rest of my undergraduate education, punctuated by ableness, whiteness, masculinity, and fluctuating forms of support.