bluuebunny/crossref_metadata_2025 huggingface dataset:
A Demonstration of Modern Geostationary and Polar-Orbiting Satellite Products for the Identification and Tracking of Elevated Mixed Layers
Authors: Gitro Christopher M. , Bikos Daniel , Szoke Edward J. , Jurewicz Sr. Michael L. , Cohen Ariel E. , Foster Matthew W.
Published: December 2019

The elevated mixed layer (EML) can be an important aspect for severe thunderstorm forecasting. Because its thermodynamic characteristics vary as it moves eastward, tracking the EML is a crucial part of the forecasting process, something that previously has been quite challenging owing to the limited spatial and temporal resolution of observed soundings and numerical weather prediction (NWP) output. New satellite capabilities allow for improved monitoring/tracking of the EML. These include the 7.34-µm band on the Geostationary Operational Environmental Satellite-R series, as well as microwave instruments on polar-orbiting satellites used in the advected layer precipitable water product. Herein it is demonstrated—using several case studies—how using a combination of these products, in tandem with sounding data and NWP output, allows the forecaster to efficiently monitor the EML at greater spatial and temporal resolutions.
Tissue-Specific DNA Replication Defects inDrosophila melanogasterCaused by a Meier-Gorlin Syndrome Mutation in Orc4
Authors: McDaniel Stephen L , Hollatz Allison J , Branstad Anna M , Gaskill Marissa M , Fox Catherine A , Harrison Melissa M
Published: December 2019

Meier-Gorlin syndrome (MGS) is a recessive disorder caused by mutations in genes associated with DNA replication. Despite the fact these proteins are essential for replication in every cell, patients with MGS have tissue-specific defects...

Meier-Gorlin syndrome is a rare recessive disorder characterized by a number of distinct tissue-specific developmental defects. Genes encoding members of the origin recognition complex (ORC) and additional proteins essential for DNA replication (CDC6, CDT1, GMNN, CDC45, MCM5, and DONSON) are mutated in individuals diagnosed with MGS. The essential role of ORC is to license origins during the G1 phase of the cell cycle, but ORC has also been implicated in several nonreplicative functions. Because of its essential role in DNA replication, ORC is required for every cell division during development. Thus, it is unclear how the Meier-Gorlin syndrome mutations in genes encoding ORC lead to the tissue-specific defects associated with the disease. To begin to address these issues, we used Cas9-mediated genome engineering to generate a Drosophila melanogaster model of individuals carrying a specific Meier-Gorlin syndrome mutation in ORC4 along with control strains. Together these strains provide the first metazoan model for an MGS mutation in which the mutation was engineered at the endogenous locus along with precisely defined control strains. Flies homozygous for the engineered MGS allele reach adulthood, but with several tissue-specific defects. Genetic analysis revealed that this Orc4 allele was a hypomorph. Mutant females were sterile, and phenotypic analyses suggested that defects in DNA replication was an underlying cause. By leveraging the well-studied Drosophila system, we provide evidence that a disease-causing mutation in Orc4 disrupts DNA replication, and we propose that in individuals with MGS defects arise preferentially in tissues with a high-replication demand.
Efectos de la inclusión de ejercicios de salto con y sin sobrecarga externa en el calentamiento sobre parámetros de rendimiento físico en atletas jóvenes de balonmano
Authors: Gómez-Álvarez Nicolás , Moyano Francisco , Huichaqueo Elías , Veruggio Matías , Urrutia Víctor , Hermosilla Felipe , Pavez-Adasme Gustavo
Published: December 2019

El objetivo de este estudio fue comparar los efectos de un calentamiento con aplicación de saltos cargados y sin carga sobre el tiempo en sprint de 20 metros, saltos horizontales y saltos verticales en jugadores juveniles de balonmano. La muestra estaba conformada por 13 jugadores de balonmano (16,2 ± 1,3 años) de San Carlos. Se realizó un estudio experimental con un diseño crossover aleatorizado. Se aplicaron 3 protocolos de calentamiento distintos, que implicaban correr más estiramientos dinámicos (CE); correr, estiramientos dinámicos y saltos (CES), y, finalmente, correr, estiramientos dinámicos y saltos cargados con el 8 % de su peso corporal (CESH). Para las evaluaciones pre- y poscalentamiento, se utilizó un test de salto contramovimiento (CMJ), salto horizontal (SH) y sprint de 20 metros cronometrado. Los resultados muestran diferencias significativas entre pre- y postest para los 3 grupos en el SH (diferencias para CES: 0,09 ± 0,12; CESH: 0,12 ± 0,16 y CE: 0,07 ± 0,16), mientras que solo CES y CESH mejoraron significativamente la altura en CMJ y tiempo en el sprint de 20 metros (diferencia para CMJ: 2,95 ± 0,56 y 3,50 ± 0,73; y sprint de 20 m: 0,29 ± 0,31 y 0,20 ± 0,26, respectivamente). En conclusión, un calentamiento que incluye distintos tipos de saltos es eficaz para mejorar SH, CMJ y velocidad en 20 metros. Es necesario realizar más investigación, para determinar beneficios específicos de saltos con halteras de manos que mejoren el rendimiento físico.
Restauración del humedal El Tendal (Guanacaste, Costa Rica)
Authors: Bravo Juan , Piedra Lilliana
Published: December 2019

No disponible/Not available
Bosque secundario, otro componente de la finca
Authors: Quesada Ruperto
Published: December 2019

No disponible/Not available
Derecho ambiental: desde los imperios agrarios
Authors: Ángel Felipe
Published: December 2019

No disponible/Not available
Agroforestería, forestería comunitaria y agroecología
Authors: Varela Rafael , Rodríguez Luis
Published: December 2019

No disponible/Not available
Redituabilidad ecoturística de los cocodrilos del Grande de Tárcoles
Authors: Abadía Gerardo
Published: December 2019

No disponible/Not available
Encallamientos, contaminación y observación de cetáceos en Costa Rica
Authors: Cubero Priscilla , Rodríguez Javier
Published: December 2019

No disponible/Not available
Educación ambiental en torno a murciélagos
Authors: Rodríguez Bernal , Fernández Marcela , Pineda Willy
Published: December 2019

No disponible/Not available
Privatizar los servicios de agua
Authors: Echeverría Jaime
Published: December 2019

No disponible/Not available
Participación social en áreas protegidas colombianas
Authors: Correa Hernán Darío
Published: December 2019

No disponible/Not available
Injusticia y lucro en contratos de bioprospección
Authors: Rodríguez Silvia
Published: December 2019

No disponible/Not available
Planificación y renovación urbanas en Costa Rica
Authors: Argüello Manuel
Published: December 2019

No disponible/Not available
Cómo ha de ser el paisajismo tropical
Authors: Ugarte Jimena
Published: December 2019

No disponible/Not available
Identidades estudiantiles y retos pedagógicos
Authors: Camacho Oviedo Maureen , Castillo Cedeño Rocío , León Arce Heidy , Miranda Calderón Alfredo , Pereira Pérez Zulay , Vásquez Salazar Erika
Published: December 2019

Recibido 26 de setiembre de 2012 •  Corregido 04 de febrero de 2013 • Aceptado 13 de marzo de 2013El presente artículo, surge del proceso de inducción de estudiantes de primer ingreso, en el 2012, a cuatro carreras de Pedagogía en la División de Educación Básica del Centro de Investigación y Docencia en Educación (CIDE) en la Universidad Nacional. Recoge la información de 110 estudiantes. Busca la identificación de rasgos que permitan la conformación de identidades estudiantiles y los posibles retos pedagógicos que de ello se deriven. Retoma las acciones llevadas a cabo para el diseño y ejecución del proceso de inducción y los datos que aportan los instrumentos utilizados. Los hallazgos acerca de las identidades estudiantiles plantean áreas fuertes y áreas por desarrollar, que, en este caso particular, se convierten en los retos pedagógicos que han de ser atendidos desde la unidad académica. La División de Educación Básica, formadora de profesionales en diferentes disciplinas, tiene una gran responsabilidad en la transformación social y cultural del país, preparando profesionales en educación y brindando las herramientas necesarias para que los estudiantes y las estudiantes puedan lograr mayores habilidades artísticas, habilidades en redacción y ortografía, habilidades tecnológicas, habilidades deportivas, habilidades para hablar en público: estos son algunos de los retos que emergen del análisis del proceso de inducción realizado con estudiantes de nuevo ingreso.
La actitud hacia la docencia, la formación integral en la educación secundaria y a su proyecto de vida: Una visión desde los estudiantes de colegios en áreas rurales
Authors: Quirós Meneses Elionay , Jiménez Sánchez Xiomara
Published: December 2019

Recibido 18 de junio de 2012 • Corregido 05 de marzo de 2013 • Aceptado 13 de marzo de 2013

Estudio transcenccional descriptivo de enfoque cuantitativo acerca de la actitud hacia la docencia, la formación integral en la educación secundaria y a su proyecto de vida: una visión desde los estudiantes de colegios en áreas rurales, el cual fue realizado en el año 2011. Participaron 41 estudiantes de undécimo año de colegios rurales costarricenses que forman parte del programa Esperanza joven, de la División de Educología de la Universidad Nacional. La información se recopiló con una escala Likert, cuyos resultados permitieron destacar, en los estudiantes, una actitud positiva hacia el desempeño docente, la formación integral, evaluación de los aprendizajes, incentivos familiares e institucionales y metas personales. En tanto, la incentivación que ofrece la institución hacia los estudiantes obtuvo una actitud negativa. Lo anterior permite hacer un análisis objetivo y llegar a conclusiones precisas.
La mediación biopedagógica desde una perspectiva ética
Authors: Castillo Cedeño Ileana , Castillo Cedeño Rocío
Published: December 2019

Recibido 28 de febrero de 2013 • Corregido 10 de marzo de 2013 • Aceptado 13 de marzo de 2013

Este ensayo aborda el tema de la mediación biopedagógica desde una perspectiva ética, considera la trascendencia que tiene el situar a la educación desde un paradigma alternativo, donde pedagogía y vida se complementan para atender el sentido emancipador del proceso educativo.El objetivo es aportar a la reflexión y la acción sobre la mediación pedagógica y su inherente concatenación con la ética. Se parte de la premisa de la necesidad de cultivar el sentido de la existencia, desde principios y valores que exalten la vida en su multidimensionalidad y complejidad.La educación como proyecto político debe responder al reto de preparar para una ciudadanía planetaria, esfuerzo compartido que compromete a todo ser humano a trabajar por una verdadera transformación social y, por tanto, mental, para obtener mejores estados de bienestar personal y social. Se requiere direccionar todas las energías y sabiduría para poder visualizar la transformación humana que tanto demanda el planeta.
El aprendizaje combinado y el desarrollo de las habilidades requeridas para la comunicación escrita
Authors: Solano Córdoba Olga Ligia
Published: December 2019

Recibido 15 de abril de 2013 • Corregido 20 de mayo de 2013 • Aceptado 19 de junio de 2013Este artículo resume los resultados del proyecto de investigación titulado El aprendizaje combinado (presencial y no presencial apoyado por el uso de internet) y su utilidad para el desarrollo de las habilidades de expresión escrita. Fue desarrollado durante los años 2011 y 2012 con el apoyo de la Vicerrectoría de Investigación del Instituto Tecnológico de Costa Rica. Se enmarca dentro de la investigación-acción: explora y sistematiza el aporte que brinda la implementación del aprendizaje combinado (cursos bimodales) para el desarrollo de las habilidades de expresión escrita. Se diseñaron estrategias didácticas para la utilización de foros, wikis, bitácoras electrónicas, gestores bibliográficos, software para elaboración de mapas conceptuales, así como correctores ortográficos y diccionarios en línea, como medios para fomentar el uso de la lengua escrita en contextos significativos. Estas se ejecutaron con un total de ochenta y un estudiantes de la Universidad de Costa Rica y del Instituto Tecnológico de Costa Rica y trece docentes (diez impartían lecciones en Educación Superior, dos en el nivel secundario, para el Ministerio de Educación Pública y una laboraba para ambos niveles). Posteriormente, se evaluaron los resultados a través del análisis de productos seleccionados, conversatorios con las docentes participantes, entrevistas a la población participante y análisis de las bitácoras de trabajo elaboradas por la investigadora. Se concluye que el aprendizaje combinado permite el desarrollo de las habilidades de expresión escrita, ya que esto implica el desarrollo de la capacidad y destreza para cumplir con las diferentes tareas del acceso al conocimiento sobre un tema para escribir, la planificación de los escritos, la producción textual propiamente dicha, la revisión del escrito y la divulgación de producto final.
Las instituciones de educación superior y la responsabilidad social en el marco de la sustentabilidad
Authors: Cantú-Martínez Pedro César
Published: December 2019

Recibido 28 de enero de 2013 •  Corregido 10 de junio de 2013 • Aceptado 19 de junio de 2013El presente artículo de revisión aborda un tema de trascendental importancia para las instituciones de educación superior, como es la responsabilidad social. El enfoque de responsabilidad social retoma un apogeo en el dominio de los debates por la crisis ambiental y por la búsqueda del desarrollo sustentable. Este artículo de revisión expone, en particular, cómo en México, las instituciones de educación superior deben contar con un desarrollo, tanto cualitativo como cuantitativo, muy relevante que trascienda y sea permanente para contextualizar las demandas de nuestra sociedad. Además, se menciona la experiencia de implementación de la responsabilidad social en la Universidad Autónoma de Nuevo León.
Factores asociados al rendimiento académico en estudiantes universitarios desde el nivel socioeconómico: Un estudio en la Universidad de Costa Rica
Authors: Garbanzo Vargas Guiselle María
Published: December 2019

Recibido 6 de mayo de 2013 • Corregido 15 de julio de 2013 • Aceptado 31 de julio de 2013Por ser el desempeño académico de la población estudiantil en la educación superior uno de los indicadores de calidad más sobresalientes y trascendentales de la labor académica del sistema de educación superior, se realiza una investigación de corte cuantitativa, en la cual se trabaja con una cohorte de estudiantes universitarios en la educación superior, específicamente en la Universidad de Costa Rica, que en el momento del estudio se encontraban graduados o en los últimos años de su carrera, se les aplicó un cuestionario en forma personalizado. El estudio indaga el tema de los factores asociados al rendimiento académico desde el nivel socioeconómico en estudiantes universitarios y su objetivo general consiste en analizar los factores asociados al rendimiento académico en estudiantes que, por su condición socioeconómica, se les asignó la máxima categoría de beca, y estudiantes que no solicitaron beca por esta condición de carreras de alta y baja demanda de la Universidad de Costa Rica. De esta forma, se aborda la problemática del rendimiento académico, desde el nivel socioeconómico de sus estudiantes, esta variable se considera de importancia para ofrecer un marco explicativo y proporcionar insumos a las políticas institucionales en el campo de la educación superior pública. El estudio permitió ratificar que el rendimiento académico es altamente multicausal y complejo; es el producto de la interacción de múltiples factores sociales, personales, institucionales-académicos que pueden variar de una población a otra, así como la existencia de diferencias significativas entre las variables lineales: índice de satisfacción universitaria, índice de hábitos de estudio, índice de apoyo en los estudios universitarios, índice de satisfacción con los profesores e índice de nivel socioeconómico; sin embargo, se mostró que no producen diferencias en las variables más importantes, como lo son el promedio ponderado y la nota de admisión.
Actividades de aprendizaje y TIC: Usos entre docentes de la Educación General Básica costarricense. Aproximación diagnóstica
Authors: Campos Jiménez Karolina , Carvajal Jiménez Vivian , Castro Gutiérrez Enia Romilia , Hutchinson Heath Sandra , Masís Muñoz Maribel , Murillo León Susana , Rojas Alvarado Grace , Rojas Ramírez Fabián , Sánchez Chacón Giovanny
Published: December 2019

Recibido 11 de octubre de 2013 • Corregido 22 de noviembre de 2013 • Aceptado 06 de diciembre de 2013Dos de las entidades encargadas de administrar y decidir acerca de la formación inicial y continua de los docentes costarricenses, a saber, el Ministerio de Educación Pública (MEP) y la Universidad Nacional (UNA), desarrollaron entre 2011 y 2012 un proceso investigativo para apoyar la construcción de conocimientos relacionados con la incorporación de las tecnologías de la información y la comunicación (TIC) en contextos educativos y, al mismo tiempo, participar de la generación de innovaciones que coadyuven a fundamentar y orientar las políticas educativas nacionales y de formación docente. Dicha indagación parte del reconocimiento de actividades de aprendizaje que se apoyan en las TIC y que son implementadas por el personal docente, en la Educación General Básica (EGB), como una forma de orientar su quehacer educativo hacia espacios críticos, colaborativos y gestores de aprendizajes relevantes para los involucrados. Para esta exploración, se consideran catorce de las regiones educativas en las que el MEP divide el país: Desamparados, Limón, San Ramón, Los Santos, Pérez Zeledón, Grande de Térraba, Puntarenas, Aguirre, Coto, Liberia, Upala, Cañas, Santa Cruz y Nicoya. Para el abordaje teórico, esta propuesta se basa en los aportes de César Coll (2005), quien parte de las relaciones existentes en lo que este autor llama el triángulo interactivo; una metodología que remite al estudio de relaciones entre tres elementos: el contenido, la actividad educativa instruccional del profesorado y las actividades de aprendizaje del grupo estudiantil. En este artículo se abordan nueve de las categorías que Coll (2005) señala como frecuentes en las prácticas de mediación que involucran las TIC y, adicionalmente, emergen tres categorías que la investigación arroja para comprender en qué situaciones y con qué fines los docentes costarricenses de la EGB emplean las TIC durante su práctica pedagógica. Este trabajo es desarrollado por un equipo interinstitucional de investigadores de la Universidad Nacional y el Ministerio de Educación Pública.
La formación integral del estudiantado de ingeniería a través de la educación continua
Authors: Reynoso Flores Miguel , Castillo Elizondo Jaime Arturo , Dimas Rangel María Isabel
Published: December 2019

Recibido 4 de octubre de 2013 • Corregido 29 de octubre de 2013 • Aceptado 6 de noviembre de 2013El presente artículo aborda un tema prioritario para la formación del estudiantado en general y en particular para los futuros ingenieros e ingenieras. A pesar de que en los últimos años se ha abordado con frecuencia esta temática; aún son insuficientes las propuestas en el caso del estudiante de ingeniería. El objetivo de este artículo es fundamentar teórica y empíricamente las potencialidades que posee la educación continua como una de las áreas fundamentales que poseen las facultades de ingeniería para la formación integral de sus estudiantes. Se muestran resultados preliminares de un proyecto de investigación solicitado por la Facultad de Ingeniería Mecánica y Eléctrica (FIME) de la Universidad Autónoma de Nuevo León, México, a partir de la necesidad de perfeccionar el proceso formativo de los estudiantes con un enfoque integral.  Se expone la justificación del estudio  y se presentan algunos de los resultados obtenidos en la fase exploratoria.
Characterization of Patients with Biopsy-Proven Non-Alcoholic Fatty Liver Disease and Normal Aminotransferase Levels
Authors: Ulasoglu Celal , Enc Feruze Yilmaz , Kaya Eda , Yilmaz Yusuf
Published: December 2019

Background and Aims: Non-alcoholic fatty liver disease (NAFLD) is one of the major causes of abnormal liver function tests in hepatology practice. However, not all patients with NAFLD have increased aminotransferase levels. The aim of this study was to compare the clinical and histologic characteristics of patients with biopsyproven NAFLD showing normal versus elevated aminotransferase levels.

Methods: We retrospectively reviewed 515 patients with biopsy-proven NAFLD. Patients with ALT ≤ 40 U/L and AST ≤ 37 U/L were considered as having normal liver enzymes. A histological fibrosis score F ≥ 3 was used to define advanced fibrosis.

Results: Of the 515 study participants, 107 (20.8%) had normal liver enzymes. Compared with patients showing elevated liver enzymes, those with normal aminotransferase levels were older and most commonly women. Moreover, they had a higher body mass index and more frequently showed metabolic risk factors (metabolic syndrome, diabetes mellitus, hypertension, higher waist and hip circumferences). Although liver histology tended to be less severe in patients with normal liver enzymes, the prevalence of advanced fibrosis was similar in the two groups. Diabetes mellitus (odds ratio [OR] = 2.12, 95% confidence interval [CI] = 1.46−3.91, p < 0.001) and age (OR = 1.14, 95% CI = 1.07−1.24, p < 0.05) were identified as independent predictors of advanced fibrosis in patients with normal aminotransferase levels.

Conclusions: NAFLD with normal aminotransferase levels is characterized by a severe metabolic profile and a prevalence of advanced fibrosis similar to that identified in cases with elevated aminotransferase levels.
Management Guidelines for Pancreatic Cystic Lesions: Should we Adopt or Adapt the Current Roadmaps?
Authors: Vilas-Boas Filipe , Macedo Guilherme
Published: December 2019

Pancreatic cystic lesions are very prevalent, especially in elderly patients and are increasingly being diagnosed because of the massive use of cross sectional imaging. Our knowledge about the natural history of these lesions is limited, especially in the case of intraductal papillary mucinous neoplasms. This fact explains why scientific societies guidelines statements are based on evidence graded as very low quality and helps the understanding of some of the different guidelines recommendations. Several guidelines have been recently revised to incorporate the new evidence published in the literature with the aim to help clinicians make the best decisions. American Gastroenterological Association guidelines, a revision of the International Consensus Guidelines, the American College of Gastroenterology and the European Study Group guidelines are the most recent. Herein we review the current guidelines on pancreatic cysts and focus our discussion on controversies and updates about the best imaging modalities, the indications for endoscopic ultrasound guided fine needle aspiration, cyst fluid analysis, indications for resection and surveillance strategies.
PNPLA3 I148M Polymorphism in Patients with Nonalcoholic Fatty Liver Disease, Obesity and Prediabetes
Authors: Karamfilova Vera , Gateva Antoaneta , Assyov Yavor , Alexiev Asen , Savov Alexey , Yaneva Nadejda , Ivanova Irena , Ivanova-Boyanova Radina , Ivanova Raya , Vlahova Zlatina , Mateva Ludmila , Kamenov Zdravko
Published: December 2019

Background and Aims: Nonalcoholic fatty liver disease (NAFLD) is closely associated with obesity and insulin resistance, and therefore predisposes to type 2 diabetes and cardiovascular diseases. Lipid deposition in the liver seems to be critical in the pathogenesis of NAFLD. A common genetic variant, the patatin-like phospholipase domain-containing protein 3 (PNPLA3) has been associated with NAFLD. The aim of the present study was to evaluate the association between PNPLA3, key gene of lipid metabolism and the metabolic traits in obesity NAFLD patients with and without prediabetes.

Methods: A total of 208 obese NAFLD patients without (n=125) and with prediabetes (n=83) were included. The genotyping of PNPLA3 I148M variant (rs738409) was performed by restriction analysis.

Results: Regarding rs738409 (I148M) polymorphism, CG genotype was positively correlated with prediabetes, insulin resistance, dyslipidemia and metabolic syndrome compared to the wild CC genotype. The carriers of the PNPLA3 I148M variant have 9.6-fold higher risk of glucose disturbances compared to wild genotype (OR 9.649, 95%CI 2.100-44.328, р=0.004). The carriers of the PNPLA3 I148M variant also have a 3 times higher risk for the presence of metabolic syndrome (OR 2.939, 95% CI: 1.590-5.434, p=0.001) and a 2.1-fold higher risk for the presence of insulin resistance (OR 2.127, 95% CI: 1.078-4.194, p=0.029).

Conclusions: PNPLA3 I148M is associated with increased risk of prediabetes, metabolic syndrome and insulin resistance in obese patients with NAFLD.
Transduodenal EUS FNA Diagnosis of Idiopathic Retroperitoneal Fibrosis
Authors: Chira Romeo Ioan , Dragomir Irina , Ichim Vlad Andrei , Bintintan Vasile Virgil
Published: December 2019

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Anger Mediates the Relationship between Pain and Depression in Irritable Bowel Syndrome
Authors: Fadgyas Stanculete Mihaela , Capatina Octavia , Pojoga Cristina , Surdea Blaga Teodora
Published: December 2019

Background and Aims: Anger has been linked to irritable bowel syndrome (IBS), but the mechanism underlying this relationship is still unknown. This cross-sectional study explores the possibility that anger mediates the relationship between pain severity and depression in IBS patients.

Methods: The sample included 70 consecutively evaluated patients who met Rome III criteria for IBS diagnosis and 55 healthy controls. All participants completed measures of depression, pain, state and trait anger, and anger expression style.

Results: Using a mediational model involving a series of linear regressions we found that trait anger and anger expression index partially mediated the association between depression and abdominal pain severity. The IBS patients with significant pain reported higher depressive symptoms; these results could be partially explained by their tendency to experience angry feelings generated by pain.

Conclusions: The relation between pain and depression is not a direct and linear one, but works partly through patients’ tendency to become angry and through anger expression style regarding their pain.
Bioprosthetic Aortic Valve Fracture During Valve-in-valve Transcatheter Aortic Valve Implantation
Authors: O’Donnell John Phineas , O’Sullivan Cróchán J
Published: December 2019

The limited durability of surgical bioprostheses, combined with an ageing population, has led to an increasing demand for replacing degenerated bioprosthetic surgical heart valves, which is projected to increase. Valve-in-valve transcatheter aortic valve implantation involves implanting a transcatheter heart valve within a degenerated bioprosthetic surgical heart valve. A significant minority of patients, however, are left with a suboptimal haemodynamic result with high residual gradients. This is more common with smaller surgical bioprostheses, and may be associated with a worse prognosis. The novel concept of fracturing the previously implanted bioprosthetic surgical heart valve during valve- in-valve transcatheter aortic valve implantation to create a more favourable haemodynamic profile has shown great promise, particularly in smaller valves. Herein, we describe the benefits, limitations and potential complications of this novel approach.
Jankovichian, Szeletian or a leaf point industry: Analysis of three small lithic assamblages
Authors: Markó András
Published: December 2019

The eponymous site of the Jankovichian industry was found at the Öreg kő cliff, in the northern part of the Transdanubia, Western Hungary. From the thick layer complex of the Jankovich cave, however, only 104 lithics were collected and the scarce data showed that the pieces belong to several archaeological entities. At the same time, the nearly total lack of the field documentation allowed the reconstruction of the stratigraphic position of each artefact only in a few cases. The stratigraphic integrity is missing from the archaeological material of the Kiskevély and Szelim caves as well as the Csákvár rock shelter, and according to the recent evaluations the bifacial tools from the Dzeravá skála (Pálffy cave) and Lovas belong to the Micoquian and the Late Palaeolithic period.

In this paper we analyse the following three assemblages, excavated after World War II in Transdanubia: the Pilisszántó rock shelter II, the Bivak and the Remete Felső caves. The chronological, basically, bio-stratigraphic data known from these layers are also evaluated.

The conclusion of the study is that (1) the chronological data of the studied sites do not permit to place the archaeological occupation of each cave into the Early Würm or to the Late Middle Palaeolithic period and (2) the validity of a distinct Jankovichian industry cannot be proved.
Cadastral field works on prehistoric mounds in the central part of the Tiszántúl region
Authors: Bede Ádám
Published: December 2019

The aim of the present paper is to provide a comprehensive report on the cadastral works of mounds in the central part of Tiszántúl (the region east of the Tisza River), taking the burial mounds of the Late Copper Age Yamnaya entity as a starting point. Theoretical and field research began around the beginning of the 19th century, and in the second half of the 20th century systematic site registration took place, mainly due to the so-called ‘Archaeological Sites of Hungary’ project. Later on national surveys and local initiatives were carried out, but they are of very different quality. In addition to the main characteristics and results of the creation of these cadastres, we also outline further scientific studies on mounds.
Better training, better births project: a preliminary evaluation
Authors: Gale Alison , Hanson Jacky , Schram Catharina , Davis Mike
Published: December 2019

This article was migrated. The article was not marked as recommended. This paper describes the experience of planning and presentation of a short human factors training intervention aimed at staff working in maternity services, in light of some challenging conclusions about negative outcomes of existing maternity provision. A local initiative, initiated and supported by Health Education England (HEE) and involving 3 trusts in the north west of England, was aimed at providing appropriate training for senior practitioners. While many participants claimed knowledge of and confidence in Human Factors (HF) issues, the course was well received and ongoing training needs were identified, if only for their junior colleagues. The paper explores plans for a Phase 2 programme which is designed to roll out the training to those junior staff and to begin the process of gathering data from observation of practice on a day to day basis. Data from this activity will inform a plan for Phase 3 when issues of shop floor culture will be subject to productive intervention.
SOSYAL MEDYADA PAYLAŞILAN REKLAMLARIN KÜLTÜR ENDÜSTRİSİ VE CİNSİYETÇİLİK KAVRAMLARI BAĞLAMINDA İNCELENMESİ
Authors: EKER Cihangir
Published: December 2019

Bu çalışmada sosyal medya ortamında görülen
reklam paylaşımlarında var olan cinsiyetçi dil ve bu dilin kültür endüstrisi
ile ilişkisi irdelenmektedir. Adorno, kültür endüstrisini "bireyi bir meta
haline getiren ve iktidarın kullanımına sunan bir araç" olarak
tanımlamaktadır (Alpyürür). Tüketim ve tükettirmek üzerine inşa edilen kitle
kültürünü üreten bu endüstri; sanat, eğlence, dinlenme, boş zamanları
değerlendirme gibi pek çok yaşam pratiğini tüketim eylemine dönüştürmektedir
(Kara, 2014: 52). Bu dönüştürme eyleminin propagandasını kitle iletişim
araçları üzerinden gerçekleştiren endüstri bunun için reklamları sık sık
kullanır ve reklamlarda genellikle cinsiyetçi söylemlere başvurur. Televizyon
ve sinema gibi ortamlarda görünür olan cinsiyetçi söylemle inşa edilmiş bu
reklamlarla internette de karşılaşılmakta ve bunlar bireyin cinsiyetçi
söylemlere maruz kalmasına sebep olmaktadır. Araştırmanın amacı, internet
ortamında var olan ve kültür endüstrisinin çıkarlarıyla örtüşen, tüketim
propagandasını cinsiyetçi söylemlere başvurarak üretilen bu reklamlara dikkat çekmek
ve bu konuda farkındalığı artırmaktır. Araştırma literatür taramasına dayalı
betimsel bir çalışmadır. Ayrıca seçilen reklam görselleri, kültür endüstrisi ve
cinsiyetçilik kavramları çerçevesinde içeriksel olarak incelenmiştir.
El componente social de la amenaza híbrida y su detección con modelos bayesianos
Authors: Ruiz-Ruano Ana-María , López-Puga Jorge , Delgado-Morán Juan-Jose
Published: December 2019

Las sociedades contemporáneas están cada vez más condicionadas por el desarrollo de la tecnología informática. Esa tendencia deja entrever un panorama en el que cada ser humano se identifica por el binomio persona-computadora, mientras que la mayor informatización de la vida civil está generando ingentes cantidades de datos que son susceptibles de ser gestionados con fines bélicos. El objetivo de este artículo es abordar la utilidad potencial de las redes bayesianas como herramientas destinadas a la monitorización y detección temprana de ataques híbridos de carácter social a escala global. Como conclusión, planteamos que el uso de la inferencia y las redes bayesianas es útil para monitorear, detectar y supervisar el componente social de las amenazas híbridas a escala global por medio del análisis de las redes sociales.

Abstract

Contemporary societies are increasingly conditioned by the development of computer technology. This trend suggests a picture in which each human being is identified by the person-computer binomial while greater computerization of civil life is generating huge amounts of data that are likely to be managed for war purposes. The objective of this article is to address the potential utility of Bayesian networks aimed at monitoring and early detection of hybrid attacks of a global nature. We conclude that the use of inference and Bayesian networks is useful for monitoring, detection and supervision of the social component of hybrid threats globally through social network analysis.
Recloser based energy exposure assessment of a distribution network
Authors: Thomas R. , Van Zyl S. , Naidoo R.M. , Bansal R.C. , Mbungu N.T. , Bipath M.
Published: December 2019

The optimised placement of reclosers on a distribution network is known to improve the reliability of a power system. Furthermore, the protection settings on distribution systems rely heavily on the number and placement of such reclosers. This study examined the effect of using protection settings methodology with the placement of reclosers to ameliorate the damage sustained during faults on a distribution network. The aim of the study was to determine whether this ‘damage control factor’ should be a future consideration for recloser placement. It has been found that the determination of the number and placement of reclosers, which are the function of the energy exposure of feeder, helped to optimise the operation and reliability of a distribution network. This could benefit both energy users and energy suppliers, who often face different challenges during the fault levels on the network.
Quality control of solar radiation data within the South African Weather Service solar radiometric network
Authors: Ntsangwane Lucky , Mabasa Brighton , Sivakumar Venkataraman , Zwane Nosipho , Ncongwane Katlego , Botai Joel
Published: December 2019

This study reports on the performance results of the Baseline Surface Radiation Network (BSRN) quality control procedures applied to the solar radiation data, from September 2013 to December 2017, within the South African Weather Service radiometric network. The overall percentage performance of the SAWS solar radiation network based on BSRN quality control methodology was 97.79%, 93.64%, 91.60% and 92.23% for long wave downward irradiance (LWD), global horizontal irradiance (GHI), diffuse horizontal irradiance (DHI) and direct normal irradiance (DNI), respectively, with operational problems largely dominating the percentage of bad data. The overall average performance of the surface solar radiation dataset – Heliosat data records for the GHI estimation for all stations showed a mean bias deviation of 8.28 Wm-2, a mean absolute deviation of 9.06 Wm-2 and the root mean square deviation of 11.02 Wm-2. The correlation, quantified by the square of correlation coefficient (R2), between ground-based and Heliosat-derived GHI time series was ~0.98. The established network has the potential to provide high quality minute solar radiation data sets (GHI, DHI, DNI and LWD) and auxiliary hourly meteorological parameters vital for scientific and practical applications in renewable energy technologies.
Potential for grid efficiency based on a combination of leakage reactances of transformers of a transmission interconnecting line: Application of an exhaustive search algorithm
Authors: Mbuli N. , Dyantyi A. , Pretorius J.H.C.
Published: December 2019

Transmission interconnecting lines (called interconnectors in this study) are built to facilitate the exchange of active and reactive power between two areas of a network. Step-up and step-down transformers are required at the ends of the interconnector when interconnectors are at a different voltage, usually higher, than the networks to be connected. A study was carried out to examine the impact on active power losses of a combination of leakage reactances of the transformers at the ends of an interconnector. The study assessed whether combinations can lead to different levels of active power losses and can thus affect the efficiency of the system. It was found that the combinations of reactance have a tangible impact on the power that flows through the interconnector and, consequently, on the sharing of apparent power between the interconnector and the rest of the network. The total active power losses varied appreciably with the various combinations of reactances, resulting in the life-cycle cost of active power losses also varying with the combinations. The study showed that the combination needs to be carefully made, considering that such a choice can have a significant impact on techno-economic aspects of the power system.
Importance measure of probabilistic common cause failures under system hybrid uncertainty based on bayesian network
Authors: Mi Jinhua , Li Yan-Feng , Beer Michael , Broggi Matteo , Cheng Yuhua
Published: December 2019

When dealing with modern complex systems, the relationship existing between components can lead to the appearance of various
dependencies between component failures, where multiple items of the system fail simultaneously in unpredictable fashions. These
probabilistic common cause failures affect greatly the performance of these critical systems. In this paper a novel methodology
is developed to quantify the importance of common cause failures when hybrid uncertainties are presented in systems. First, the
probabilistic common cause failures are modeled with Bayesian networks and are incorporated into the system exploiting the α
factor model. Then, probability-boxes (bound analysis method) are introduced to model the hybrid uncertainties and quantify the
effect of uncertainties on system reliability. Furthermore, an extended Birnbaum importance measure is defined to identify the
critical common cause failure events and coupling impact factors when uncertainties are expressed by probability-boxes. Finally,
the effectiveness of the method is demonstrated through a numerical example
Maintenance of industrial reactors supported by deep learning driven ultrasound tomography
Authors: Kłosowski Grzegorz , Rymarczyk Tomasz , Kania Konrad , Świć Antoni , Cieplak Tomasz
Published: December 2019

Monitoring of industrial processes is an important element ensuring the proper maintenance of equipment and high level of processes reliability. The presented research concerns the application of the deep learning method in the field of ultrasound tomography (UST). A novel algorithm that uses simultaneously multiple classification convolutional neural networks (CNNs) to generate
monochrome 2D images was developed. In order to meet a compromise between the number of the networks and the number of
all possible outcomes of a single network, it was proposed to divide the output image into 4-pixel clusters. Therefore, the number
of required CNNs has been reduced fourfold and there are 16 distinct outcomes from single network. The new algorithm was first
verified using simulation data and then tested on real data. The accuracy of image reconstruction exceeded 95%. The results
obtained by using the new CNN clustered algorithm were compared with five popular machine learning algorithms: shallow
Artificial Neural Network, Linear Support Vector Machine, Classification Tree, Medium k-Nearest Neighbor classification and
Naive Bayes. Based on this comparison, it was found that the newly developed method of multiple convolutional neural networks
(MCNN) generates the highest quality images.
Evaluation of the use of hybrid electric powertrain system in urban traffic conditions
Authors: Szumska Emilia , Jurecki Rafał , Pawełczyk Marek
Published: December 2019

The conditions of use of the vehicle significantly affect the performance results. Traffic conditions in a specific city directly affect
the consumption of energy, fuel and emissions of harmful compounds in exhaust fumes. Conduction of the measurements of a vehicle’s performance parameters in operating conditions is very troublesome and is often not possible to realize. An alternative is
to use the simulation programs. Vehicle simulation programs offer options related to vehicle models or drive unit components and
allow development of new models. Based on the results of simulation testing, it is possible to analyse the level of fuel and energy
consumption as well as emissions of harmful compounds in exhaust gases and the operating effectiveness of the drive system in
the speed profile. The paper presents the evaluation of the effectiveness of using hybrid electric drive system in passenger cars in
medium-sized city traffic conditions using the Kielce example. The simulation tests were based on the speed profiles recorded during real-world test drives in various times of the day. The simulation results were used to conduct an analysis of fuel consumption
and pollutant emissions recorded by conventional and hybrid vehicles.
A novel reliability estimation method of multi-state system based on structure learning algorithm
Authors: Li Zhifeng , Wang Zili , Ren Yi , Yang Dezhen , Lv Xing
Published: December 2019

Traditional reliability models, such as fault tree analysis (FTA) and reliability block diagram (RBD), are typically constructed
with reference to the function principle graph that is produced by system engineers, which requires substantial time and effort. In
addition, the quality and correctness of the models depend on the ability and experience of the engineers and the models are difficult to verify. With the development of data acquisition, data mining and system modeling techniques, the operational data of a
complex system considering multi-state, dependent behavior can be obtained and analyzed automatically. In this paper, we present
a method that is based on the K2 algorithm for establishing a Bayesian network (BN) for estimating the reliability of a multi-state
system with dependent behavior. Facilitated by BN tools, the reliability modeling and the reliability estimation can be conducted
automatically. An illustrative example is used to demonstrate the performance of the method.
Energy losses’ reduction in metallic screens of MV cable power lines and busbar bridges composed of single-core cables
Authors: Andruszkiewicz Jerzy , Lorenc Józef , Łowczowski Krzysztof , Weychan Agnieszka , Zawodniak Józef
Published: December 2019

The growing share of medium voltage cable lines in distribution networks challenges distribution network operators
in terms of proper mode of operation of these lines. It is related to the reduction of energy losses in cable conductors
and metallic cable screens. The article focuses on energy losses in metallic cable screens of cable lines and substation
busbar bridges composed of single-core cables with metallic screens and possible ways of their reduction. Simulation
and measurement analysis of the level of energy losses in the metallic screens of cables is presented together with the
economic analysis of various variants of losses reduction through the change of the way these screens are operated in
relation to the traditional bilateral earthing at both ends of cable. Technical problems and threats connected with the
use of considered modifications of metallic screens operation during earth fault disturbances in distribution networks
are also presented
A model of an adaptive strategy of preventive maintenance of complex technical objects
Authors: Młynarski Stanisław , Pilch Robert , Smolnik Maksymilian , Szybka Jan , Wiązania Grzegorz
Published: December 2019

The paper presents results of the analysis of the developed models for complex technical objects preventive maintenance scheduling. Models based on two different sets of assumptions were developed. The general problem solved was to determine the joint
time of preventive renewal for a group of parts or subassemblies. The purpose of the first model (the model of scheduled preventive
maintenance strategy) is to determine the profitability of constant application of a previously developed preventive maintenance
schedule for a part undergoing post-failure renewal. The second model (the model of adaptive strategy of a system’s preventive
maintenance) allows one to determine a new joint time of preventive renewal for a group of parts each time when one of them is
undergoing a post-failure renewal. The initial preventive maintenance strategy for each part or subassembly was obtained using typical tools for maintenance planning (decision-random models based on dynamic programming and Bellman’s principle
of optimality). Exemplary simulation calculations with the use of both models were made and their results presented as the total
maintenance costs estimated for the renewal strategies developed. The object of the analysis were the chosen geometrical features
of a rail vehicle wheel changing due to its wear during operation. Based on this kind of analysis, one can choose a better preventive maintenance model for a specific application area.