Modeling of Electrokinetic Remediation Combining Local Chemical Equilibrium and Chemical Reaction Kinetics

A mathematical model for reactive-transport processes in porous media is presented. The modeled system includes diffusion, electromigration and electroosmosis as the most relevant transport mechanism and water electrolysis at the electrodes, aqueous species complexation, precipitation and dissolution as the chemical reactions taken place during the treatment time. The model is based on the local chemical equilibrium for most of the reversible chemical reactions occurring in the process. As a novel enhancement of previous models, the local chemical equilibrium reactive-transport model is combined with the solution of the transient equations for the kinetics of those chemical reactions that have representative rates in the same order than the transport mechanisms. The model is validated by comparison of simulation and experimental results for an acid- enhanced electrokinetic treatment of a real Pb-contaminated calcareous soil. The kinetics of the main pH buffering process, the calcite dissolution, was defined by a simplified empirical kinetic law. Results show that the evaluation of kinetic rate entails a significant improvement of the model prediction capability.This work has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 778045. Part of this work was supported financially by the European Commission within the project LIFE12 ENV/IT/442 SEKRET “Sediment electrokinetic remediation technology for heavy metal pollution removal”. Paz-Garcia acknowledges the financial support from the “Proyecto Puente - Plan Propio de Investigación y Transferencia de la Universidad de Málaga”, code: PPIT.UMA.B5.2018/17. Villen-Guzman acknowledges the financial support from the University of Malaga through a postdoctoral contract

Influence of chemical reaction kinetics on electrokinetic remediation modelling results

A numerical model describing transport of multiple species and chemical reactions during electrokinetic treatment is presented. The transport mechanisms included in the model were electromigration and electroosmosis. The chemical reactions taken into account were water electrolysis at the electrodes, aqueous species complexation, precipitation, and dissolution. The model was applied to simulate experimental data from an acid-enhanced electrokinetic treatment of a Pb-contaminated calcareous soil. The kinetics of the main pH buffering process (i.e., calcite dissolution) was taken into account and its time-dependent behavior was described by a rate law. The influence of kinetics was evaluated by comparing the results from a set of simulations in which calcite dissolution was implemented considering thermodynamic equilibrium and another set in which the same reaction was described by the rate law. The results show that the prediction capability of the model significantly improves when the kinetic rate is taken into account.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Intervenciones de Enfermería durante la atención de Puerperio Fisiológico (mediato), según normas y protocolos en el puesto de salud El Progreso

Puerperio propiamente dicho (2do. al 10mo. día). Corresponde al periodo de máxima involución de los órganos genitales, de mayor derrame loquial y de instalación de la secreción láctea. En Nicaragua no se ha realizado investigación del tema presentado. El propósito de esta investigación es Identificar las acciones de Enfermería durante la atención del puerperio fisiológico, comparándolas con el cuidado aplicado durante la atención en las pacientes, realizando evaluaciones de intervenciones ejecutadas por el profesional de salud. Es un de enfoque mixto, tipo descriptivo, analítico, prospectivo de corte transversal, con un universo de 48 mujeres en puerperio fisiológico, una muestra por conveniencia de 15 pacientes en puerperio propiamente dicho, y con un monitoreo de 20 expediente de pacientes con estas características, con principal fuente de información normativas y protocolos Minsa, libros relevantes a la investigación, artículos científicos, el uso de la web, y revisión de seminario de graduación. Obteniendo resultados de: atención satisfactorios en su mayoría con 11 intervenciones (79%) de 14 actividades, y en monitoreo 13 reflejadas en expedientes clínicos (92%). De manera conclusoria se identificaron que las intervenciones están basadas en normas y protocolos del MINSA. Según la comparación los resultados son satisfactorios a la observación, y positivos en el monitoreo de expediente

Abscisic Acid as an Emerging Modulator of the Responses of Plants to Low Oxygen Conditions

Different environmental and developmental cues involve low oxygen conditions, particularly those associated to abiotic stress conditions. It is widely accepted that plant responses to low oxygen conditions are mainly regulated by ethylene (ET). However, interaction with other hormonal signaling pathways as gibberellins (GAs), auxin (IAA), or nitric oxide (NO) has been well-documented. In this network of interactions, abscisic acid (ABA) has always been present and regarded to as a negative regulator of the development of morphological adaptations to soil flooding: hyponastic growth, adventitious root emergence, or formation of secondary aerenchyma in different plant species. However, recent evidence points toward a positive role of this plant hormone on the modulation of plant responses to hypoxia and, more importantly, on the ability to recover during the post-hypoxic period. In this work, the involvement of ABA as an emerging regulator of plant responses to low oxygen conditions alone or in interaction with other hormones is reviewed and discussed

Innovaciones y Historias: A Home- and Community-Based Approach to Workplace Literacy

Drawing from Latinx studies and the literacy experiences of men employed as university custodial staff, we propose a home- and community-based approach to workplace literacy. The central goals of this approach are to allow participants to identify their professional and vocational literacies to highlight their literate assets and goals across contexts. The approach offers a humanizing lens for individuals who are often denied the opportunity to showcase their literate repertoires and desires within the context of their formal workplaces. Overall, this article calls for a broader understanding of participants\u27 literacy experiences--not only as workers but as people who work

Plan De Responsabilidad Social Empresarial - Factor Servi S.A.S

Anexo 1 - Código de Ética, Anexo 2 - Formato de recolección de informaciónLa Responsabilidad Social empresarial es un concepto que cada vez cobra más fuerza en Colombia y en el mundo por el impacto que tienen las compañías en la sociedad, por ello es tan importante que las empresas que quieran permanecer en el tiempo, se apropien de conceptos y herramientas que apliquen los principios de la RSE y trasciendan en su cadena de valor y partes interesadas. El presente trabajo tiene como fin dar un concepto sobre la información estudiada en el Diplomado en Gerencia Estratégica y Responsabilidad Social y Empresarial, y permitir un acercamiento práctico de las posturas de los autores y la aplicación de los conceptos en la vida cotidiana.Corporate Social Responsibility is a concept that is gaining more and more strength in Colombia and in the world due to the impact that companies have on society, which is why it is so important that companies that want to remain in time, appropriate concepts and tools that apply the principles of CSR and transcend their value chain and stakeholders. The present work aims to give a concept about the information studied in the Diploma in Strategic Management and Social and Business Responsibility, and to allow a practical approach to the positions of the authors and the application of the concepts in everyday life

Estrategias de urbanismo sostenible para maximizar la utilidad del espacio público en el Malecón San Pedro Talara 2022

El presente informe tuvo como objetivo general determinar en qué medida las estrategias urbano sostenible maximizarán la utilidad del espacio público en el Malecón San Pedro – Talara 2022. La metodología desarrollada fue de tipo básica con un diseño no experimental y transversal, así mismo el enfoque fue de carácter mixto, donde la técnica utilizada fueron la entrevista, encuestas y observación directa, es por ello que los instrumentos utilizados fueron el cuestionario, la entrevista no estructurada y las fichas de observación, por otra parte, la población constituida fueron los usuarios que visitan este malecón, donde se tuvo como muestra 35 de ellas. La conclusión principal fue que a través de la correlación de Pearson, la cual dio como resultado un 0,662, donde determinó la existencia de una influencia positiva directa entre las variables estudiadas, con un nivel de significación alta, donde se observa que a más estrategias de urbanismo sostenible mayor utilidad se le da a este espacio público, así mismo nuestro encuestado Arq. Guzmán reafirmó que las estrategias sostenibles son fundamentales para el desarrollo de las ciudades, y por ello menciona la importancia de aplicar este tipo de estrategias para maximizar la utilidad de los espacios públicos

Impact of Heat Stress on Oocyte Developmental Competence and Pre-Implantation Embryo Viability in Cattle

\ua9 2024 by the authors.Rectal and vaginal temperatures are utilised in both in vivo and in vitro models to study the effects of heat stress on oocyte competence and embryo viability in cattle. However, uterine temperature increases by only 0.5 \ub0C in heat-stressed cows, significantly lower than simulated increases in in vitro models. Temperature variations within oviducts and ovarian follicles during heat stress are poorly understood or unavailable, and evidence is lacking that oocytes and pre-implantation embryos experience mild (40 \ub0C) or severe (41 \ub0C) heat stress inside the ovarian follicle and the oviduct and uterus, respectively. Gathering detailed temperature data from the reproductive tract and follicles is crucial to accurately assess oocyte competence and embryo viability under realistic heat stress conditions. Potential harm from heat stress on oocytes and embryos may result from reduced nutrient availability (e.g., diminished blood flow to the reproductive tract) or other unidentified mechanisms affecting tissue function rather than direct thermal effects. Refining in vivo stress models in cattle is essential to accurately identify animals truly experiencing heat stress, rather than assuming heat stress exposure as done in most studies. This will improve model reliability and aid in the selection of heat-tolerant animals