Concentration polarization quantification and minimization in cork process wastewater ultrafiltration by an ozone pretreatment

Concentration polarization and membrane fouling have been identified as the main problems during the ultrafiltration treatment of cork processing wastewaters. These problems drastically reduce the permeate fluxes and, therefore, their potential applications. In this work, a soft ozonation pretreatment was applied to minimize these undesirable effects. A new systematic study was carried out for membranes with different molecular weight cut-offs and at different operating conditions to monitor and quantify the concentration polarization caused by the wastewater's remaining ozonated compounds. Film theory was used to correlate the mass transfer coefficient, k, and the intrinsic rejection coefficient, f ', with the resistance introduced by concentration polarization. The ultrafiltration treatment was carried out under varying hydrodynamic operating conditions (circulating flow rates of 100-200 L/h) and transmembrane pressures (1-3 bar) for a set of four cellulose acetate membranes covering a wide range of molecular weight cut-offs (5000-100,000 Da) and hydraulic permeabilities (25-110 kg/h/m(2)/bar). The ozone pretreatment (at wastewater pH) reduced the phenolic content selectively (direct oxidation) by more than 50%, reducing membrane fouling and concentration polarization and increasing permeate fluxes (by 22-45%) and mass transfer coefficients (up to six times).info:eu-repo/semantics/publishedVersio

Psychometric Evaluation of the Happiness Scale of Lima in a Mexican Sample

Mexico among the happiest countries in the world despite their low scores on virtually all elements that provide well-being, requires psychosocial indicators that explain the happiness of Mexicans. The objective of this study was to determine the psychometric properties of the lime happiness scale (LHS) in a heterogeneous Mexican sample. The LHS considers happiness as a multidimensional behavior with an important cultural burden for the Latino population. Exploratory factorial analysis and confirmatory factor analysis were performed using the structural equations method. The studies were carried out with two heterogeneous samples of 600 Mexicans each. The results obtained led to the identification of a bifactorial model where positive affect correlates positively with satisfaction with life.México de entre los países más felices del mundo a pesar de sus bajas puntuaciones en prácticamente todos los elementos que proveen bienestar, requiere de indicadores psicosociales que expliquen la felicidad de los mexicanos. El objetivo de este estudio fue conocer la estructura de la felicidad para una muestra mexicana, a través de la validación de la Escala de Felicidad de Lima (EFL), la cual considera la felicidad como un comportamiento multidimensional con una importante carga cultural para población latina. Se realizaron análisis factorial exploratorio y análisis factorial confirmatorio mediante el método de ecuaciones estructurales (SEM). Los estudios se efectuaron con dos muestras heterogéneas de 600 mexicanos cada una. Los resultados obtenidos llevan a identificar un modelo bifactorial donde el afecto positivo correlaciona positivamente con la satisfacción con la vida

El funcionamiento de la firma electronica en el derecho registral y notarial en Chile

65 p.El Funcionamiento de la Firma Electrónica en el Derecho Registral y Notarial, es un tema de gran relevancia legal y social, por la circunstancia que constituye un hito importante dentro de un proceso de modernización del sistema registral y notarial chileno, que afecta a Notarios y Conservadores de Bienes Raíces, los que han debido adaptarse paulatinamente a este proceso innovador. Es por este motivo, que la metodología a utilizar es una investigación mixta, enfocando el tema desde una perspectiva jurídica dogmática, sin dejar de lado, el aspecto realista, utilizando el trabajo de campo, para conocer la realidad social que subyace a toda normativa legal. Finalmente, se pretende demostrar que el funcionamiento del sistema de firma electrónica avanzada, cubre los estándares de confianza y seguridad jurídica./ ABSTRACT: The Functioning of the Electronic Signature in the Registry and Notarized law is a topic of great legal and social relevancy, because it constitutes an important milestone inside a modernization process to the Chilean system of Registry and Notarized, that affects bother Notaries and Real Estate Registrars, who must have adapted gradually to this innovative process. Is for this motive, that the methodology used is a mixed investigation focusing the topic from a juridical dogmatic perspective, without leaving a side, the realistic aspect, using the fieldwork, to know the social reality that underlies any legal regulation. Finally, it will be demonstrate that the functioning of the system of electronic advanced signature covers the confidence standards and juridical safety

El cuestionario de actitudes hacia la igualdad de géneros (CAIG): elaboración y estudio psicométrico.

De Sola Dominguez, Maria Amelia [email protected] Melia Navarro, Jose Luis - [email protected] trabajo describe el desarrollo y análisis psicométrico de un nuevo cuestionario para la medida de las actitudes hacia la igualdad de géneros. Incluye la descripción del cuestionario, su proceso de elaboración y su estructura factorial, así como los resultados de los análisis de fiabilidad y validez realizados. Finalmente, se adjunta el texto de los treinta ítems que componen la escala

Parâmetros de saúde da raça holstein-frísia em comparação com os respectivos cruzamentos com as raças montbéliarde e vermelha sueca

Orientação: Carlos Bettencourt ; co-orientação: João PaisanaOs programas de selecção da raça Holstein-Frísia (HF) colocaram grande ênfase nos caracteres de produção, resultando num rápido aumento da produção de leite ao longo dos últimos anos. O aumento da produção foi acompanhado pelo declínio da fertilidade, saúde e longevidade. O uso intensivo de alguns touros, associado ao desenvolvimento das tecnologias reprodutivas, resultou no aumento da consanguinidade na população mundial da raça HF. O cruzamento com diferentes raças permite tirar partido da heterose e aproveitar a complementaridade entre raças, reduzindo os efeitos da consanguinidade. O presente estudo teve como objectivo comparar a prevalência de cetose, deslocamento do abomaso (DA), hipocalcémia e mastite, nas três primeiras lactações, entre a raça HF e o seu cruzamento com a raça Montbéliarde (MB) e com a raça Vermelha Sueca (VS), assim como a taxa de sobrevivência durante a primeira lactação. Para tal, foram obtidos os registos de uma exploração leiteira, compreendendo o período entre Janeiro de 2012 e Novembro de 2017, com uma amostra de 275 vacas, das quais 124 HF, 101 HFxMB e 50 HFxVS. A prevalência de cetose durante a primeira lactação foi superior para vacas HF (33%) e inferior para vacas HFxMB (18%). A prevalência de DA foi superior para vacas HF (11%) e inferior para vacas HFxVS (0%). A prevalência de mastite durante a primeira lactação foi superior para vacas HF (17%) e inferior para vacas HFxVS (2%). Apesar da sugestão da superioridade da raça MB e VS relativamente a alguns parâmetros de saúde, as gerações subsequentes devem ser estudadas para avaliar as consequências a longo prazo do cruzamento rotacional de três raças.Selection programs of the Holstein Friesian breed (HF) placed great emphasis on production traits, resulting in a rapid increase of milk yield over the last few years. The increase in production was accompanied by a decline in fertility, health and longevity. The intensive use of some bulls, associated with the development of reproductive technologies, has lead to an increased inbreeding in the HF world population. The crossbreeding with different breeds allows heterosis and exploit the complementarity between breeds, reducing the effects of inbreeding. The present study aimed to compare the prevalence of ketosis, abomasal displacement (AD), hypocalcemia and mastitis in the first three lactations, between the breed HF and its crossbreeding with a Montbéliarde breed (MB) and with a Swedish Red breed (SR), as well as the survival rates during first lactation. For this purpose, the records of a dairy farm were obtained, comprising the period between January 2012 and November 2017, with a sample of 275 cows, of which 124 HF, 101 HFxMB and 50 HFxSR. The prevalence of ketosis during the first lactation was higher for HF cows (33%) and lower for HFxMB cows (18%). The prevalence of AD was higher for HF (11%) and lower for HFxSR (0%) cows. A prevalence of mastitis during a first lactation was higher for HF (17%) and lower for HFxSR (2%). Despite the suggestion of the superiority of the MB and SR breeds regarding some health parameters, the subsequent generations should be studied to evaluate the consequences of the three races rotational crossbreeding

La educación física como medio para fortalecer la educación en valores en una institución educativa de La Molina, 2021

A lo largo de los años, la sociedad ha ido enfrentando una grave carencia de valores, aquellos que se reconocen como los pilares para coexistir armoniosamente en comunidad. Dicha crisis se evidencia en diversos espacios; si bien, es la familia quien, en primera instancia, inculca los valores a sus hijos, es en el ámbito escolar donde los maestros complementan dichos valores éticos ymorales. Es por ello que, organismos como la UNESCO (2015), señalan a la Educación Física y el deporte como un medio para fortalecer la enseñanza en valores; con el fin de alcanzar una formación integral en los alumnos, a través del desarrollo e interacción de las habilidades sociomotrices. Siguiendo esta misma línea, el presente trabajo de investigación tiene como objetivo analizar la Educación Física como medio para fortalecer la educación en valores en una institución educativa de La Molina, 2021. Este estudio consta de un enfoque cualitativo, de diseño fenomenológico, de investigación de tipo aplicada. Por otro lado, se aplicó como técnica la guía de entrevistas, siendo el instrumento la entrevista semiestructurada realizada a directivos y docentes de la especialidad. Asimismo, el análisis de las perspectivas brindadas por cada participante contribuyó a interpretar y comprender la relación existente entre la Educación Física y el inculcar valores mediante su práctica. Por último, se concluye, que este aprendizaje significativo debe ser guiado por docentes comprometidos que permanezcan en constante actualización; para que, de esta manera, sepan aplicar de manera oportuna las estrategias didácticas en su labor educadora, puesto que, son ellos los principales agentes de cambio capaces de lograr una educación integral para la vida

Bispyrrolidinoindoline Epi(poly)thiodioxopiperazines (BPI-ETPs) and simplified mimetics: structural characterization, bioactivities, and total synthesis

Within the 2,5-dioxopiperazine-containing natural products generated by “head-to-tail” cyclization of peptides, those derived from tryptophan allow further structural diversification due to the rich chemical reactivity of the indole heterocycle, which can generate tetracyclic fragments of hexahydropyrrolo[2,3-b]indole or pyrrolidinoindoline skeleton fused to the 2,5-dioxopiperazine. Even more complex are the dimeric bispyrrolidinoindoline epi(poly)thiodioxopiperazines (BPI-ETPs), since they feature transannular (poly)sulfide bridges connecting C3 and C6 of their 2,5-dioxopiperazine rings. Homo- and heterodimers composed of diastereomeric epi(poly)thiodioxopiperazines increase the complexity of the family. Furthermore, putative biogenetically generated downstream metabolites with C11 and C11’-hydroxylated cores, as well as deoxygenated and/or oxidized side chain counterparts, have also been described. The isolation of these complex polycyclic tryptophan-derived alkaloids from the classical sources, their structural characterization, the description of the relevant biological activities and putative biogenetic routes, and the synthetic efforts to generate and confirm their structures and also to prepare and further evaluate structurally simple analogs will be reported.Xunta de Galicia | Ref. GRC ED431C 2021/045Ministerio de Economía | Ref. PID2019-107855RB-I00Xunta de Galicia | Ref. ED-431G/02-FEDE