bluuebunny/crossref_metadata_2025 huggingface dataset:
Esophageal Stricture Caused by CMV in a Non-HIV-Infected Renal Transplant Patient
Authors: Tennant Tamera C. , Pandey Samiksha , Edhi Ahmed I. , Batke Mihaela
Published: August 2022

Esophageal stricture due to cytomegalovirus (CMV) infection is an uncommon pathology, with most reported cases occurring in patients infected with human immunodeficiency virus. We report a renal transplant patient who presented with progressive dysphagia and weight loss for 2 years. Endoscopic examination revealed a long esophageal stricture with a necrotic lesion but no typical CMV esophageal ulcers; immunostains were positive for CMV. Dysphagia resolved after treatment with ganciclovir and serial esophageal dilations. We are presenting the first case of esophageal stricture due to CMV esophagitis in a renal transplant patient without human immunodeficiency virus infection and are reviewing current literature.
Liver Failure in Neonates With G6PD Deficiency
Authors: Shah Milaan , Gopalareddy Vani
Published: August 2022

Glucose-6-phosphate dehydrogenase (G6PD) deficiency is a commonly inherited enzyme defect that can present with hemolysis, hyperbilirubinemia, and jaundice and may cause kidney and liver dysfunction. G6PD deficiency may serve as a cofactor for chronic liver disease; however, an association with liver failure is not well described. We present the cases of 2 neonates with G6PD deficiency and progressive liver failure resistant to treatment with ursodiol that eventually required liver transplantation. Our cases underscore the importance of monitoring liver function in jaundiced neonates with underlying G6PD deficiency and demonstrate the potential precipitation of liver disease by G6PD deficiency.
A Rare Cause of Upper Gastrointestinal Bleeding: Sarcina ventriculi
Authors: Worrall Emily B. , Chhaparia Anuj , Carpenter Danielle , Neuschwander-Tetri Brent A.
Published: August 2022

We describe a patient who presented with hematemesis and was found to have unusually well-demarcated erythematous mucosa with a 2–3 cm irregular nonbleeding necrotic ulcer in the gastric body on esophagogastroduodenoscopy. Biopsy and pathologic examination of the tissue indicated infection with a rare bacterium, Sarcina ventriculi, prompting treatment with an unproven combination of 4 agents: metronidazole, ciprofloxacin, sucralfate, and pantoprazole. Repeat esophagogastroduodenoscopy 8 weeks later revealed complete resolution of the ulceration and surrounding erythema. These results may contribute toward establishing an appropriate therapeutic regimen for future S. ventriculi infections.
Post­Covid syndrome during the Covid-­19 pandemic
Authors: Chernokov O. , Shchurok I.
Published: August 2022

We review the classification, mechanisms of infection and multiple organ damage, as well as clinical manifestations of Post-CoVid syndrome (Post-CoViD Conditions, Long CoViD, Post-acute CoViD). The data was obtained via search in the PubMed system. For the query (long) AND (covid) at the time of 06.20.2021, 12 221 results were found, which underlines the relevance of this issue. The issues of the immunopathogenesis of Covid-19 development and possible causes of the development of Post-Covid syndrome were also highlighted.
Toxigenic cosmopolitan micromycetes of the genus Aspergillus: new facts of recent decades
Authors: Kononenko G.
Published: August 2022

The review presents an analysis of the current state of the problem associated with the production of toxic metabolites by three species of fungi of the genus Aspergillus – A. flavus, A. niger and A. fumigatus. All of them are known for their extensive occurrence in the environment, pathogenicity and traditional use in industrial biotechnology. In recent decades aflatoxins, cyclopiazonic acid, fumonisins of group B, gliotoxin and clavine ergot alkaloids have been assigned to the group of priority attention from the whole variety of structural types of toxins peculiar to these fungi. Large-scale studies of A. flavus and A. niger populations infecting agricultural products have been carried out in many regions of the world, their chemo- and phenotypic composition has been described, the prospects of molecular methods for improving the safety of industrial cultures and replacement strains recommended for biological correction have been shown, and new information has been obtained confirming the participation of toxic metabolites of A. fumigatus in the development of pathogenesis.
Factors affecting economic profits of Phon Yang Kham beef cattle farming in Sakon Nakhon province
Authors: Chaisombut P. , Umpapol H. , Hanmontree R. , Hanmontree P. , Srilapat C. , Sawnongbua P. , Chaisitipatana C. , Lertjunthuk L. , Rapankum N.
Published: August 2022

The study aimed to determine factors affecting economic profits of beef cattle business in Sakon Nakhon Province. A sample of 400 members of Kor Ror Por Klang Phon Yang Kham Livestock Coop-erative Limited was determined by using Taro Yamane method, and binary logistic regression analysis was used to analyze the data. The findings showed that the variables with the statistical significance of 0.01 included concentrate feeds, roughage, and the raised period of less than or equal to 12 months. They were statistically significant at 0.001 0.000, and 0.000 respectively, and the odd ratios were 1.387, 0.921, and 5.697 respectively. Additionally, the variables with the statistical significance of 0.05 includ-ed Charolais cattle (62.50%) and farm location. The two variables were statistically significant at 0.023 and 0.039 respectively with the odd ratios of 5.083 and 0.595 respectively. If the cows are fed on 1 more kg/day of more concentrated feed, it is likely for the farmers to increase economic profit by 0.921 times and 1.387 times respectively. The probability of economic profit is by 5.697 times if the cattle are raised no more than 12 months. The cross-bred cattle with 62.50% Charolais breed showed the proba-bility for the farmers to gain economic profit by 5.083 times. Finally, those who had farms located next to the farm family’s home were more likely to gain less economic profit by 0.595 times.
Análisis de la distribución del arbolado urbano de alineación en La Plata, Argentina
Authors: Birche Mariana
Published: August 2022

Se analiza la distribución espacial del arbolado público de alineación en La Plata, entendiéndolo como uno de los factores fundamentales para construir espacios públicos de calidad y como factor de agrado en la percepción de estos espacios por parte de los habitantes, en cuanto el valor cultural y ambiental asociado a estos espacios, gracias a su alta valoración en calidad paisajística tal cual se muestra en los diversos estudios sobre la calidad del paisaje los cuales proponen a la vegetación como uno de los elementos más valiosos. Por eso, se buscó identificar las áreas donde existen las mayores carencias en materia de arbolado urbano, a través de un inventario georreferenciado y, paralelamente, comparar estos datos cuantitativos con los obtenidos en una encuesta a la población. Los resultados permitieron constatar una importante disparidad numérica de ejemplares entre el casco fundacional y la periferia de la ciudad. Pero, además, pudieron inferirse otros aspectos, como la relación entre la ocupación de la parcela y la existencia de arbolado urbano, lo cual evidencia el rol de la sociedad civil como promotora y desarrolladora del arbolado público.
Renovación urbana y derecho a la ciudad: discursos y actores en torno a la renovación del espacio público en el centro histórico de Medellín
Authors: Serna Yurany Andrea
Published: August 2022

Se aborda el problema de las renovaciones urbanas y su impacto sobre el derecho a la ciudad a falta de intervenciones integrales que aporten a la solución de problemas estructurales. El objetivo principal es analizar los actores y los discursos que se activan en torno a la renovación del espacio público en el centro histórico de Medellín, sus motivaciones y sus incidencias en el derecho a la ciudad. Para ello se hace revisión bibliográfica a escala europea, latinoamericana y nacional; también se triangula con la información recopilada mediante el método etnográfico y la teoría crítica para el análisis del discurso. Los hallazgos evidencian cómo la renovación activa discursos y tensiones devenidas en gestiones que no afectan decisiones sobre la planeación de la ciudad, pero influyen en decisiones técnicas sobre el espacio público, y afectan, por tanto, las relaciones en el espacio social, porque se incluyen intereses de ciudadanos con mejor calidad de vida, que excluyen a sectores marginados. Dicha inclusión está ligada a la capacidad de participación, donde no se expresa con la misma eficiencia la población vulnerable; esta, usualmente, no expone sus propios intereses, a falta de reconocimiento de los mecanismos de participación ciudadana. Además de lo anterior, se evidencia la expectativa de desarrollo inmobiliario propiciado por la renovación, como respuesta a las prácticas globales en las que se inserta la ciudad, objeto de consolidación económica mundial. Así, los habitantes que han resistido precariamente en el centro histórico de Medellín, sosteniéndose mediante prácticas informales, incluso ilegales, soportan el rechazo social de las clases altas y algunos rasgos de la gentrificación como estrategia de mundialización de la cultura.
Infraestructura y dotación de servicio del transporte público urbano de la ciudad de Portoviejo
Authors: Moreira-Villavicencio Luisa
Published: August 2022

Hay importantes problemas generados en la movilidad urbana de la ciudad de Portoviejo a través del sistema de transporte público, una problemática cuyo enfoque principal es determinar indicadores sobre la infraestructura y la dotación del servicio. Esta coyuntura permite analizar e indagar sobre tres aspectos importantes del transporte en la ciudad de Portoviejo, que serán ejes fundamentales para la investigación: la infraestructura vial, la calidad del servicio y la demanda con los posibles efectos que conlleva la pandemia de la COVID-19 en la vida social urbana. Esta investigación tiene como objetivo determinar, en diferentes ámbitos, los niveles de servicios y el estado actual de la infraestructura correspondiente al transporte. El interés en cuantificar y cualificar dichos parámetros radica en incentivar el uso del transporte urbano colectivo y generar la accesibilidad espacial que dicho servicio requiere. A través de los resultados obtenidos en la investigación, se determina el uso del transporte público como una opción óptima que permite la movilización de personas y bienes.
El arte callejero como herramienta transformadora para una nueva ciudadanía en Manizales, Colombia
Authors: Marulanda-Montes Andrea , Mejía-Amézquita Valentina , Giraldo-Ospina Tania
Published: August 2022

Hoy por hoy, el arte callejero —específicamente, el mural y el grafiti— ha aportado imaginarios diferentes de los insinuados en las ciudades planificadas con una herencia positivista y racionalista, y aunque las investigaciones al respecto en Colombia son pocas, hay un naciente campo de estudio con amplias posibilidades para su entendimiento en relación con la apropiación del espacio público y de otras formas de concebir, entender y habitar la ciudad. Este artículo intenta vislumbrar el papel que juegan las expresiones artísticas contemporáneas del muralismo en el habitar del espacio urbano de Manizales. Este trabajo se centra en el inventario de murales realizados entre 2012 y 2020 y la subsecuente reflexión sobre las dinámicas socializadoras para repensar lo público en la ciudad. La metodología de la investigación fue de corte cualitativo, a partir de un análisis hermenéutico y fenomenológico. Se utilizó un sistema de información geográfica (SIG) para agrupar los murales en cuatro categorías: artistas, temáticas, lugares y festivales o narrativas de arte urbano. Los resultados denotan preponderancias y aspectos comunes en relación con las categorías definidas, lo que permitió un ejercicio reflexivo a partir de la observación del fenómeno mismo. Este trabajo permitió una mirada crítica el muralismo en la ciudad identificándolo como partícipe en la aparición de lugares diferenciados y como una expresión que contribuye a crear imaginarios diferentes de los establecidos sugiriendo la transformación del espacio público.
P.Oxy. XII 1466: una richiesta di tutor mulieris in formato di diploma
Authors: Colella Lucia C.
Published: August 2022

This paper proposes a re-edition of P.Oxy. XII 1466. Whereas previous editors recognised remains of another document on the verso, the whole piece appears to be a copy of a petition for a tutor mulieris addressed to the prefect of Egypt. It is drawn up in the form of a diploma, written transversa charta, with remains of three witnesses’ signatures on the verso at 90° to the text of the recto.
Releasing Everything Bound in the Knot: P.Saqqara inv. F.17.10
Authors: Love Edward O. D. , Zellmann-Rohrer Michael
Published: August 2022

Re-interpretation of a Coptic magical text on paper from Saqqara in light of parallels from earlier Egyptian as well as medieval Greek, Latin, and Syriac ritual texts: the central motif, which refers to wind, wave, and snakes, is applied to the cure of impotence, conceived as the releasing of ritual binding.
Novel insights into heme binding to hemoglobin
Authors: Hopp Marie-Therese , Rathod Dhruv Chetanbhai , Winn Kristina Helena , Ambast Shubhi , Imhof Diana
Published: August 2022

Under hemolytic conditions, hemoglobin and subsequently heme are rapidly released, leading to the toxic effects characterizing diseases such as β-thalassemia and sickle cell disease. Herein, we provide evidence that human hemoglobin can bind heme in a transient fashion via surface-exposed sequence motifs. Following the synthesis of potential heme-binding motifs (HBMs) as peptides, their heme-binding capacity was investigated by UV–vis spectroscopy and ranked according to their binding affinity. Heme binding to human hemoglobin was subsequently studied by UV–vis and surface plasmon resonance (SPR) spectroscopy, revealing a heme-binding affinity in the sub- to micromolar range and a stoichiometry that clearly exceeds a 1:1 ratio. In silico molecular docking and simulation studies confirmed heme binding to the respective motifs in the β-chain of hemoglobin. Finally, the peroxidase-like activity of hemoglobin and the hemoglobin-heme complex was monitored, which indicated a much higher activity (>1800%) than other heme-peptide/protein complexes reported so far. The present study provides novel insights into the nature of intact hemoglobin concerning its transient interaction with heme, which suggests for the first time potential heme-scavenging properties of the protein at concomitant disassembly and, consequently, a potentiation of hemolysis and related processes.
Flexural analysis of hemp, kenaf and glass fibre-reinforced polyester resin
Authors: Mohamad Muhammad Aizuddin , Jumahat Aidah , Sapiai Napisah
Published: August 2022

Natural fibres have a high potential to replace synthetic fibres such as glass in a variety of applications. However, natural fibre-reinforced composites still have some limitations with respect to the mechanical performance especially in high load bearing capabilities. The hybridization of natural fibres with synthetic fibres in the same matrix has proven to create a balancing effect and enhanced the composites performance. Besides that, fibre architectures that include fibres continuity, fibres orientation, fibres arrangement and fibres interlocking are also considered to enhance the overall performance of the composites. In this study, the hemp mat, kenaf mat and glass chopped strand mat were hybridised with woven glass fibres, respectively in polyester resin to form 12 systems of the composites. The hybridization effects of different fibre core material, fibre core thickness and fibre arrangement on flexural response were investigated according to ASTM D7264. The results indicated that hybrid CSM glass/woven glass composite showed the highest flexural strength and modulus compared to hemp/woven glass and kenaf/woven glass composites, with about 377.15 ± 48.41 MPa and 16.74 ± 7.15 GPa. Among natural fibres, kenaf fibre (2WG/K/2WG) composite showed better flexural properties compared to hemp fibre (2WG/H/2WG) composite. 2WG/2G/2WG composites with two plies of CSM glass showed maximum flexural properties. As for hemp/woven glass and kenaf/glass hybrid composites, the flexural properties reached a maximum value in system arrangement of (2:1:2) but it reduced in the system arrangement of (2:2:2) and (2:4:2). On the evaluation effect of fibre arrangement, hemp, kenaf and glass mat used as core (arrange in the middle; (2:2:2)) showed higher flexural properties as compared to the use as skin (arrange in outer; (1:4:1)). (2WG/2K/2WG) showed better flexural properties than (2WG/2H/2WG) as the core, while (H/4WG/H) showed better flexural properties than (K/4WG/K) as skin.
Effect of Nano-MgO on the Durability of Cement-Based Materials
Authors: Chen Yaohua , Liu Jiesheng , Feng Bowen , Wei Jing , Tan Xiaoming , Zhang Man , Sun Zhengguang
Published: August 2022

The autogenous shrinkage of cement-based materials is difficult to solve. Some studies have found that nano-magnesium oxide (MgO) can be used as an expansive agent to improve the shrinkage performance of cement-based materials. The basic research on nano-MgO in cement-based materials has appeared, but the research on the durability of cement-based materials by nano-MgO is very rare. In this article, nano-MgO was incorporated into cement mortar, and the experimental research studies effects of nano-MgO content on permeability resistance, crack resistance, sulfate corrosion resistance, and freeze-thaw resistance of cement mortar. The results show that nano-MgO can improve the durability of mortar. The mechanism of nano-MgO is discussed by this article in improving the durability of cement mortar, and it provides a theoretical basis for the further application of nano-MgO in cement-based materials.
Influencia de la consolidación de las tuberosidades en los resultados clínicos de la prótesis invertida para fracturas de húmero proximal
Authors: Rossi Luciano A. , Juana Camila , Fieiras Cecilia , Brandariz Rodrigo , Tanoira Ignacio , Ranalletta Maximiliano
Published: August 2022

Objetivo: Comparar los resultados clínicos y las complicaciones de una serie consecutiva de pacientes con fracturas de húmero proximal tratados con prótesis invertida de hombro y con consolidación anatómica de las tuberosidades o sin ella.
Materiales y Métodos: Se evaluó a 113 pacientes >65 años con fractura de húmero proximal tratados con prótesis invertida de hombro. Setenta presentaron consolidación anatómica de las tuberosidades y 43, ausencia de consolidación. Se evaluó el rango de movilidad, y se utilizaron los puntajes de Constant-Murley, ASES, SANE y la escala analógica visual. Se documentaron todas las complicaciones y las reoperaciones.
Resultados: El seguimiento promedio fue de 56 meses (rango 24-96) y la edad media era de 73 años (rango65-83). La elevación activa y la rotación interna medias posoperatorias fueron de 131° (± 14) y 27° (± 5), respectivamente. La rotación externa posoperatoria media en abducción y aducción fue de 27° (± 1) y 15° (± 6), respectivamente. La escala analógica visual promedio posoperatoria fue de 1,7 (± 0,8). Los puntajes ASES, de Constant-Murley y SANE promedio fueron de 76 (± 6), 62 (± 11) y 74% (± 7), respectivamente. La elevación anterior, la rotación externa y los puntajes funcionales promedio finales ASES y de Constant-Murley fueron significativamente mejores en el grupo con consolidación de las tuberosidades.
Conclusiones: En pacientes >65 años con fractura de húmero proximal tratados con prótesis invertida de hombro tanto la movilidad posoperatoria, como los puntajes funcionales fueron significativamente mejores en los pacientes con consolidación anatómica de las tuberosidades.
Apraxia severa por atrapamiento del nervio radial en el brazo: “síndrome de Lotem”. Presentación de un caso
Authors: Patiño Juan Martín , Fernández Alexis , Mondino Nicolás Pedro , Garay Alberto Luis , Andrés Bernardo , Martínez Carlos Eugenio , Orsolini Igor
Published: August 2022

Se presenta el caso de un hombre de 57 años que consulta por parálisis alta del nervio radial, con dolor y prueba de Tinel positiva en la cara lateral del brazo dominante, de inicio súbito, luego de grandes esfuerzos musculares repetitivos, sin mejoría clínica al tercer mes de evolución. Se realizó un tratamiento quirúrgico descompresivo. El paciente tuvo una rápida recuperación a partir del séptimo día, y remisión completa a los 25 días de la cirugía.
Conclusión: El atrapamiento del nervio radial en el brazo es un cuadro poco frecuente. Según los estudios publicados, la evolución clínica es variada, pero si no hay remisión o la evolución de la parálisis no es favorable en 3 meses, creemos que la cirugía es el tratamiento de elección.
Neurotizaciones para la flexión del codo en lesiones traumáticas del plexo braquial
Authors: Gardenal Ricardo Martín , Vélez Manuel , Glasberg Ernesto , Seri Matías , Faccendini Sebastián , Slullitel Miguel , Bichara Jorge , Capomassi Miguel
Published: August 2022

Objetivo: Evaluar los resultados de diferentes neurotizaciones utilizadas para la flexión del codo en pacientes con lesión traumática del plexo braquial.
Materiales y Métodos: Entre abril de 2012 y enero de 2019, se operaron 13 pacientes (12 hombres) con lesión traumática del plexo braquial, 5 con parálisis totales sin recuperación, 4 con parálisis totales que recuperaron el tronco inferior parcialmente y 4 con parálisis altas. Las neurotizaciones para la flexión del codo fueron: 3 nervios intercostales con injerto sural a nervio musculocutáneo o su(s) rama(s) motora(s) (4 pacientes), 3 nervios intercostales a nervio musculocutáneo sin injerto (3 pacientes), nervio espinal accesorio a ramas motoras del nervio musculocutáneo con injerto sural (2 pacientes), fascículos del nervio cubital a rama motora del bíceps (3 pacientes) y fascículos del nervio cubital y fascículos del nervio mediano a ramasmotoras del bíceps y braquial anterior (3 pacientes). Se evaluaron la fuerza de flexión del codo (M0-M5), el dolor con la escala analógica visual y se utilizó el puntaje DASH. El seguimiento promedio fue de 50 meses.
Resultados: La fuerza de flexión del codo fue M5 (1 paciente), M4 (7 pacientes), M3 (1 paciente), M2 (1 paciente) y M1 (2 pacientes). El puntaje DASH promedio fue de 54,1 antes de la cirugía y 29,5 en el posoperatorio. El puntaje de dolor preoperatorio fue de 7 y de 0,9 posoperatorio. No hubo complicaciones.
Conclusiones: Las neurotizaciones lograron resultados satisfactorios en la reconstrucción de la flexión activadel codo en pacientes con lesión del plexo braquial.
Osteosíntesis de fracturas complejas de húmero distal. Nuestra experiencia
Authors: Muñoz Fabián Enrique , Rosso Guiñazu Emmanuel Julio Lisandro
Published: August 2022

Objetivo: Describir los resultados obtenidos en el tratamiento de las fracturas de húmero distal mediante reducción abierta y fijación interna y reflejar si el abordaje empleado tuvo impacto en el resultado funcional.

Materiales y Métodos: Se llevó a cabo un estudio retrospectivo de presentación de casos. Se evaluó a 19 pacientes con diagnóstico de fractura de húmero distal compleja tratados con reducción abierta y fijación interna entre 2015 y 2021. Se realizó un control radiográfico periódico y se evaluó el resultado funcional mediante escalas internacionales, como DASH y MEPS. Luego se procedió a extrapolar las variables obtenidas utilizando un programa estadístico.

Resultados: Se logró la consolidación de todas las fracturas. Se empleó el abordaje de Alonso Llames en 7 pacientes (37%) y la osteotomía de olécranon en 12 casos (63%). El puntaje DASH promedio fue de 11,31, lo que determinó discapacidades leves. El puntaje MEPS obtenido fue excelente en un paciente (5,26%), bueno en 10 (52,6%), regular en 7 (36,84%) y pobre en 1 (5,26%).

Conclusiones: La reducción abierta y la fijación interna son eficaces para tratar las fracturas complejas de húmero distal, permiten lograr buenos resultados posquirúrgicos. En esta serie, el 57% de los pacientes obtuvo resultados excelentes o buenos. No se halló una diferencia estadísticamente significativa con respecto a la elección de un abordaje u otro
Baby and Toddler Basics
Authors: Altmann Tanya
Published: August 2022

Parents of children from birth to age 3 will find answers to their most frequently asked questions about child health and wellness in this easy-to-understand, fully updated volume. Tanya Altmann, MD, FAAP, helps parents with friendly, straightforward guidance in an easily digestible question-and-answer format. Available for purchase at https://www.aap.org/baby-toddler-basics-2nd-edition-paperback/
Raymond Aron, Aristóteles y el problema de los regímenes políticos
Authors: Mansuy Daniel
Published: August 2022

El presente artículo intenta elucidar la naturaleza del proyecto político aroniano, recurriendo a su modo de clasificar los regímenes políticos. La tesis central que subyace es que, para estos efectos, conviene comprender a Aron más desde Aristóteles que desde Kant, pues en su pensamiento hay una aproximación que intenta utilizar las claves presentes en la Política para comprender el mundo moderno.
El papel de la Economía Política en el proyecto filosófico de Adam Smith. Su estudio a la luz de los principales cambios realizados por el autor en las reediciones de La Teoría de los Sentimientos Morales y de La Riqueza de las Naciones
Authors: Piqué Pilar
Published: August 2022

Se discute el principio de simpatía que Smith desarrolla en la primera edición de La teoría de los sentimientos morales (TSM), enfatizando en qué sentido lo considera insuficiente para lograr cohesión en la sociedad comercial. Se argumenta que Smith concibe a La riqueza de las naciones como parte de su misión por desarrollar una teoría de la jurisprudencia, y que en dicha obra enfatiza los peligros que se engendran en la sociedad comercial y las consecuentes dificultades para que esta logre ser una sociedad civilizada. Se arguye que tales peligros y dificultades conducen a Smith a trabajar en el campo de la ética de la virtud, incorporando la Parte VI de la última edición de la TSM
El Hacer en la perspectiva de Vladimir Jankélévitch. Indicios para un nuevo pensamiento de la inmanencia
Authors: Sferco Senda Inés
Published: August 2022

Este estudio aborda la problemática del “Hacer” en la filosofía de Vladimir Jankélévitch a partir del análisis de su perspectiva “metafísica no ontológica”. Mediante un examen pormenorizado de sus escritos más tempranos, se indaga el estatuto que el autor confiere al Hacer como instancia intuitiva, activa y siempre temporalizada de la empiria. Este recorrido permitirá considerar la potencialidad y factibilidad de esta conceptualización para un renovado pensamiento de la inmanencia.
Parrhesía. El lugar del “decir veraz” en el juego democrático
Authors: Camargo Ricardo
Published: August 2022

La parrhesía constituye una práctica de “decir veraz” que Michel Foucault investiga genealógicamente en sus últimos seminarios del Colegio de Francia, como una de las maneras originales de constitución de uno mismo en la cultura grecolatina antigua. En este trabajo, dicha noción de parrhesía es desplegada en toda su contemporaneidad política, afirmándose que constituye un complemento fundamental para la tesis agonísitica de la democracia, en especial la defendida por Chantal Mouffe. El “decir veraz” del parrhesiasta, al interpelar de manera radical el statu quo de la identidad colectiva constituida en el proceso de politización propio de la democracia radical, subvierte y transforma dicha identidad  en un objeto permanente de disputa. Se recupera así el sentido del polemos propio de la práctica democrática.
Información vs. Sentido. Análisis y discusión filosófica de la propuesta de Friedrich Kittler para la renovación de las ciencias sociales y humanas
Authors: Rubio Roberto
Published: August 2022

El presente trabajo analiza críticamente la propuesta de Kittler de renovar las ciencias sociales y humanas mediante una reflexión orientada hacia los medios de comunicación. Para ello, se sitúa tal propuesta en el debate, impulsado por el giro medial en Filosofía de los Medios, acerca de la pertinencia (o no) del enfoque trascendentalista sobre los medios. En un primer momento, se presenta en términos generales el planteo kittleriano en cuanto enfoque trascendentalista. En un segundo momento, se reconstruye y analiza la estrategia kittleriana consistente en eliminar la noción de sentido para concentrarse, en cambio, en la noción de información.
Sobre la noción de interpretación en el “ver-como” de Ludwig Wittgenstein
Authors: Sol Yuan María
Published: August 2022

Los casos de “ver-como”, presentados por Wittgenstein en la Segunda Parte de Philosophical Investigations, muestran que el concepto de “ver” se encuentra cercano al de “interpretar” y resiste su separación. El presente artículo propone un argumento para aclarar la noción de “interpretación” presente en estos casos, a partir de su comparación con los usos presentes en el Tractatus y en la Primera Parte de Philosophical Investigations. Se sostiene que dicha noción cumple el rol de determinar el sentido de lo visualmente experimentado. Además, “ver” e “interpretar” mantienen un tipo de relación interna y “ver-como” puede considerarse como una “representación elástica”.
Socialismo liberal y democracia de propietarios en la teoría de la justicia de John Rawls
Authors: Aguayo Westwood Pablo Andrés
Published: August 2022

En Teoría de la justicia Rawls no prestó suficiente atención a cómo sus principios podrían realizarse al interior de un régimen socioeconómico específico, por lo que entre sus críticos ha habido desacuerdo sobre cuál de dichos regímenes resulta más adecuado para llevar a cabo su concepción de la justicia. Con la finalidad de contribuir a esta discusión, en este artículo examino los argumentos que Rawls presentó a favor del socialismo liberal y de la democracia de propietarios como los sistemas sociales más adecuados para realizar su teoría. La discusión anterior me permitirá mostrar las críticas que Rawls presentó a las formas tradiciones del estado del bienestar.
Applying genetic algorithms for programming manufacturing cell tasks
Authors: Delgado Efredy , Cortés Rodríguez Carlos Julio , Duarte Velasco Óscar Germán
Published: August 2022

This work was aimed at developing computational intelligence for scheduling a manufacturing cell’s tasks, based mainly on genetic algorithms. The manufacturing cell was modelled as being a production-line; the makespan was calculated by using heuristics adapted from several libraries for genetic algorithms computed in C++ builder. Several problems dealing with small, medium and large list of jobs and machinery were resolved. The results were compared with other heuristics. The approach developed here would seem to be promising for future research concerning scheduling manufacturing cell tasks involving mixed batches.
Smart (Domotic) houses
Authors: Herrera Quintero Luis Felipe
Published: August 2022

The advance of telecommunications via the use of Internet has led to IP network integration. Many networks have been working successfully and have been fundamental for many areas in measuring the automation of data, thus allowing researchers and professionals to have a wider view of production in various sectors. Remote control has been developed through technological innovation making an environment consisting of human interaction based on telecommunications and control systems ever more tangible. Technological development has led to an infinite range of everyday devices being remotely controlled via Internet, the human voice, a cell-phone or normal phone keyboard or a palm, pocket PC or desk-top computer. Amongst the new activities which can be controlled in a person’s house via a PDA (Personal Digital Assistant) would be the degree of illumination; such activities are defined as being domotic. The word domotic refers to integrating several areas of knowledge such as telecommunications, electronics, informatics and electricity to improve human beings’ quality of life, thus aiding Colombian society’s growth.
Concepts of design for manufacturing (DFM) of lost wax parts
Authors: Sánchez R Claudia Marcela , Cortés Rodríguez Carlos Julio
Published: August 2022

Integrated Product Design uses several methodologies, Design for Manufacturing is one of them. DFM pretends to facilitate manufacturing of parts by means of analysis of geometries, values and tolerances, and is used in first design stages in order to decrease the product cost. The design for manufacturing was studied as well as design rules to propose a methodology for Design for Investment Casting.
Modelling some characteristics of electrical networks used as channels for providing telecommunications
Authors: Bastidas Mora Henry Arturo
Published: August 2022

This article describes the topology of the existent electric nets in different parts of the world, included the Colombian nets, and their performance when used as telecommunications channels. The transfer function is analyzed for low tension nets and radiation originated by PLC (Power Line Communications) technology is also considered. Since the radiation originated by PLC cannot be avoided completely the effect electromagnetic interference will be described with radio frequency communications. Modeling of the PLC channel is proposed and at the end conclusions are presented.
A practical approach to scheduling examinations
Authors: Astaiza A Luis Gerardo
Published: August 2022

The scheduling of exams is a well-studied combinatorial optimisation problem. However, the growth in student numbers and the advent of modularity in many institutions of higher education has resulted in a significant increase in its complexity, imposing even more difficulties on university administrators who must resolve situations, often without having recourse to any computerised aid. This paper presents a practical approach towards timetabling examinations, consisting of several phases. Such phases would include constructing a conflict matrix, selecting suitable rooms for use when scheduling exams, establishing groups of courses which can be timetabled at the same time so that clashes are not incurred, imposing restrictions for joint exams for all groups from any particular course or specifying an exam in particular, fixing the times and allocating rooms and making the timetable available to students, teachers and administrators.
Organisations’ evolutionary dynamics: a group dynamics approach
Authors: Vargas Germán Eduardo
Published: August 2022

Colombian entrepreneurs’ straggling, reactionary and inertial orientation has been inconsistently justified by the availability of internal and leveraged resources, a concept intensifying deficient technological capacity. Company activity (seen as being a socioeconomic unit) has been integrally orientated within an evolutionary framework by company identity and cohesion as well as adaptation and evolutionary mechanisms. The present document uses a group dynamics’ model to illustrate how knowledge-based strategic orientation and integration for innovation have become an imperative for development, from slight leverage, distinguishing between two evolutionary company forms: traditional economic (inertial, as they introduce sporadic incremental improvements) and modern companies (dynamic and radical innovators). Revealing conclusions obtained from such model may be used for intervening in and modernising company activity.
Obtaining decorative chromium plating from trivalent chromium solutions
Authors: Suárez García Óscar Javier
Published: August 2022

The present work was aimed at a qualitative evaluation, in the laboratory, of different alternatives for assembling and operating a trivalent chromium bath for decorative chromium plating. Different chromium concentration solutions and different complexing agents were used. The initial result of this analysis was that chloride, formate and acetate solutions produced the best results. Solution preparation conditions were evaluated: temperature, chromium III complex formation time and also operation during the plating process: pH and temperature. The experimental work was done in the Alfacrom Ltda company; the parameters evaluated consisted of the appearance of chromium deposit and the minimum current density at which it appeared. Resistance to corrosion was tested in a saline-spray chamber, taking conventional hexavalent chromium plating as reference. This assay was done in the Universidad Nacional de Colombia’s Chemical Engineering Laboratory. It was concluded that trivalent chromium plating may represent a technical and economic alternative to conventional hexavalent chromium plating, this being a highly toxic and contaminant process. However, research should be continued into finding optimal process conditions.
The university’s socioeconomic setting related to innovation
Authors: Cortés Aldana Félix Antonio
Published: August 2022

University-industry-government interaction is the key to improving conditions for innovation in a knowledge-based society. A second academic revolution aimed at integrating economic and social development (third mission) is transforming traditional university teaching and research into a university education intended for entrepreneurs. This paper thus analyses the evolution of the university/socio-economic environment relationship, the models used for explaining innovation and those encouraging innovation. Debate concerning new missions, research and a third mission are then presented. The previous elements may help determine new challenges facing Latin-American universities.
Synthesis and characterisation of simultaneous interpenetrating polymer networks (SIN) formed by polystyrene and polyurethane obtained from castor oil and cassava starch polyol-suspensions
Authors: Cabrera Anaya Juan Manuel , Navas Gómez Kelly Johanna , Pulido Flórez Jorge Enrique , Valero Valdivieso Manuel Fernando
Published: August 2022

Castor oil was modified by transesteritication with pentaerythritol and cassava starch was subsequently incorporated into this oil (oil modified by incorporating starch is called a polyol-suspension). Polyurethane/polystyrene SINs (simultaneously produced IPNs) were synthesized from them and styrene. Reactants used in the synthesis were MDI (methylene diphenyl diisocyanate) as diisocyanate, DVB (divinylbenzene) as crosslinking agent for polystyrene, dibutylamine as redox primer and benzoyl peroxide as styrene polymerisation primer. The variables considered in SIN synthesis were percentage weight ratio used in the modification (1.32%; 2.64% and 5.28%) to increase polyol hydroxyl functionality, starch species incorporated into polyol (Brazilian, Venezuelan and commercial) to vary the amount of amylopectin within the polyol-suspension, diisocyanate/hydroxyl NCO/OH (0.85 and 1) functional groups’ molar ratio and polyurethane/ polystyrene PU/PS weight ratio (70/30 and 80/20). A wide range of materials was obtained and characterised by tensile strength, hardness, chemical attack and Soxhlet extraction. The physical-mechanical properties of the materials produced with polyols (transesterified castor oil) were improved when starch was incorporated into the polyol. Several tests indicated that 24 hours as curing time were not enough, because the SINs showed lower physical-mechanical properties than the homologous polyurethane elastomers did; thus, the curing time had to be increased to 48 hours.
Experimental determination of bagasse stiffness coefficient
Authors: Arzola de la Peña Nelson
Published: August 2022

The experimentally determined stiffness coefficient of bagasse is described in this paper. This property defines the behaviour of the reaction forces exerted upon the bagasse layer when being compressed during juice-extraction in a sugar-cane mill. This information is important for correctly analysing sugar-cane mill operation and design. An experimental device was used for obtaining the stiffness coefficient; it consisted of a piston, a piston-skirt, a hydraulic press and instrumentation for measuring the pressures so produced and piston position at different times. Compression rate, humidity level and degree of bagasse fragmentation were the experimental factors taken into account in the experimental design. The investigation was carried out with 40%-80% humidity level and up to 0.06 compression rates. All experimental factors proved statistically significant in the bagasse stiffness coefficient experimental model so obtained. Bagasse was seen to behave as a very rigid elastic material under normal sugar-mill pressure operating conditions, having 50 MPa to 20,000 MPa stiffness coefficient values.
Reaction parameter study for the chemical synthesis of adsorbent silica gel
Authors: Sáenz María Carolina , Báez Quintero Carlos Andrés , Díaz Velásquez José de Jesús , Rodríguez  Niño Gerardo
Published: August 2022

This article presents an appropriate set of reaction parameters (reaction temperature, sulphuric acid and sodium silicate reagent concentration) for obtaining adsorbent silica gel (ASG) using Colombian-produced raw materials. The core of ASG synthesis lies in sulphuric acid’s neutralisation reaction with sodium silicate. Their effect on final ASG moisture adsorption capacity was measured after changing such synthesis’ above-mentioned reaction parameters. Within the range of conditions studied, it was found that the highest adsorption capacity occurred by combining both low sodium silicate concentration with high temperatures or high sulphuric acid concentration and temperature. Synthesised ASG was also compared to a commercial product (Gel de silice granulare con indicatore. Montedison group. Batch number 1684G100. Code number 453301) using adsorption capacity plots, BET areas, X-ray diffraction, mass and infrared spectrometry and mechanical strength measurements. Synthesised ASG presented larger specific surface areas but weaker mechanical strength than the commercial one. Likewise, all evaluated samples exhibited a low degree of molecular arrangement and conventional ASG chemical structure.
Biopolymers as materials for developing products in pharmaceutical applications and biomedical uses
Authors: Rojas Cortés Manuel Guillermo , Vallejo Díaz Bibiana Margarita , Perilla Perilla Jairo Ernesto
Published: August 2022

Biopolymers have been widely studied for use in pharmaceutical applications. They have been used for modifying drug release, orientating a drug towards its therapeutic target, penetrating physiological barriers (tissues and cells) and protecting unstable therapeutic agents against physiological conditions which are present in a less invasive administration routes. The importance of biopolymers in designing new biomedical devices must thus be stressed, especially when a pharmaceutical substance must be incorporated into a polymer matrix. A new generation of alternatives for human health has thus been generated by designing pharmaceutical therapeutic systems in line with the concept of “integrated custom-made product design”. This document reviews the trends concerning using biopolymers for designing products having pharmaceutical and biomedical applications. The paper also introduces the elements which should be mastered by engineers for obtaining material which can be used in the health field and tries to provide a reference point regarding the state of the art in this specific field of knowledge.
Exploiting stock data: a survey of state of the art computational techniques aimed at producing beliefs regarding investment portfolios
Authors: Linares Vásquez Mario , Hernández Losada Diego Fernando , González Osorio Fabio
Published: August 2022

Selecting an investment portfolio has inspired several models aimed at optimising the set of securities which an investor may select according to a number of specific decision criteria such as risk, expected return and planning horizon. The classical approach has been developed for supporting the two stages of portfolio selection and is supported by disciplines such as econometrics, technical analysis and corporative finance. However, with the emerging field of computational finance, new and interesting techniques have arisen in line with the need for the automatic processing of vast volumes of information. This paper surveys such new techniques which belong to the body of knowledge concerning computing and systems engineering, focusing on techniques particularly aimed at producing beliefs regarding investment portfolios.
Automatic spline-smoothing approach applied to denoise Moroccan resistivity data phosphate deposit “disturbances” map
Authors: Bakkali Saad , Bahi Lahcen
Published: August 2022

This paper focuses on presenting a method which is able to filter out noise and suppress outliers of sampled real functions under fairly general conditions. The automatic optimal spline-smoothing approach automatically determines how a cubic spline should be adjusted in a least-squares optimal sense from an a priori selection of the number of points defining an adjusting spline, but not their location on that curve. The method is fast and easily allowed for selecting several knots, thereby adding desirable flexibility to the procedure. As an illustration, we apply the AOSSA method to Moroccan resistivity data phosphate deposit “disturbances'' map. The AOSSA smoothing method is an efficient tool in interpreting geophysical potential field data which is particularly suitable in denoising, filtering and analyzing resistivity data singularities. The AOSSA smoothing and filtering approach was found to be consistently useful when applied to modeling surface phosphate “disturbances”.
Flexible linear programming with fuzzy constraints
Authors: López Ospina Héctor Andrés , Restrepo López Mauricio
Published: August 2022

The present work shows the basic concepts underlying flexible linear programming or linear programming with fuzzy constraints. The literature often presents this methodology related to inequality constraints. This works deals with a methodology for box and equality constrains; it shows how this type of problem is similar to parametric optimisation.  Two examples are given to show the advantage of using this methodology.
Using multinomial and imprecise probability for non-parametric modelling of rainfall in Manizales (Colombia)
Authors: Chivatá Cárdenas Ibsen
Published: August 2022

This article presents a rainfall model constructed by applying non-parametric modelling and imprecise probabilities; these tools were used because there was not enough homogeneous information in the study area. The area’s hydro logical information regarding rainfall was scarce and existing hydrological time series were not uniform. A distributed extended rainfall model was constructed from so-called probability boxes (p-boxes), multinomial probability distribution and confidence intervals (a friendly algorithm was constructed for non-parametric modelling by combining the last two tools). This model confirmed the high level of uncertainty involved in local rainfall modelling. Uncertainty encompassed the whole range (domain) of probability values thereby showing the severe limitations on information, leading to the conclusion that a detailed estimation of probability would lead to significant error. Nevertheless, relevant information was extracted; it was estimated that maximum daily rainfall threshold (70 mm) would be surpassed at least once every three years and the magnitude of uncertainty affecting hydrological parameter estimation. This paper’s conclusions may be of interest to non-parametric modellers and decisions-makers as such modelling and imprecise probability represents an alternative for hydrological variable assessment and maybe an obligatory procedure in the future. Its potential lies in treating scarce information and represents a robust modelling strategy for non-seasonal stochastic modelling conditions.