Dynamic secondary electron emission in dielectric/conductor mixed

Secondary Emission Yield (SEY) of dielectric materials is of great importance for prediction and testing of the Multipaction discharge in RF components for space applications. An atypical behavior of the SEY of coatings composed by a mixture of conductor and dielectric microparticles was reported and modeled in [1]; in this original model, the interactions between dielectric and conductor particles were not taken into account, but an effective action of the surface voltage generated within the sample was included. The aim of the present contribution is to more accurately model the effect the electric fields between dielectric and conductor particles have on secondary electrons emitted by the sample. One of the most prominent features of the coatings is their roughness, so a model is proposed here that takes into account both the roughness and the charging of the dielectric particles to explain the unusual charging behavior of these coatings

Avances en el indicador de perdurabilidad empresarial

El Grupo de Investigación en Perdurabilidad Empresarial de la Facultad de Administración de la Universidad del Rosario ha venido trabajando para encontrar un factor cuantitativo financiero de medición que permita apoyar la metodología para determinar si una empresa y/o sector estratégico1 es perdurable. Contar con este indicador facilita la medición del hacinamiento cuantitativo y permite poner en comparación, bajo términos unificados, el resultado de dicha herramienta con los resultados fácilmente observables a través de la investigación y consultoría cualitativa. Más de 80 sectores estratégicos han sido abordados para realizar el análisis de hacinamiento, una de las primeras dificultades que surge es la determinación del indicador cuantitativo de evaluación, ya que en la mayoría de los casos los empresarios no cuentan con indicadores no financieros para realizar una comparación frente a sus rivales directos

Indicadores estratégicos aplicados al análisis sectorial. Caso : construcción de obras residenciales

La Facultad de Administración de Empresas de la Universidad del Rosario de Bogotá ha venido trabajando en los últimos cuatro años en establecer los factores determinantes de la perdurabilidad de las empresas, y para ello ha conformado el grupo de investigación en perdurabilidad empresarial constituido por diferentes líneas de investigación para explicar el fenómeno

COVID-19 vaccine hesitancy in Spain and associated factors

Introduction: The present study explores the reasons of those who have not been vaccinated in the later stage of the vaccine rollout in Spain and its associated determinants. Methods: Cluster and logistic regression analyses were used to assess differences in claimed reasons for vaccine hesitancy in Spain using two samples of unvaccinated people (18-40 years old) gathered by an online cross-sectional survey from social networks (n = 910) and from a representative panel (n = 963) in October-November 2021. Results: The main reasons for not being vaccinated were believing that the COVID-19 vaccines had been developed too fast, they were experimental, and they were not safe, endorsed by 68.7% participants in the social network sample and 55.4% in the panel sample. The cluster analysis classified the participants into two groups. Logistic regression showed that Cluster 2 (individuals who reported structural constraints and health-related reasons such as pregnancy or medical recommendation) presented a lower trust in information from health professionals, had a lower willingness to get vaccinated in the future, and avoided less social/family events than those in Cluster 1 (reasons centered in distrust on COVID-19 vaccines, conspiracy thoughts and complacency). Conclusions: It is important to promote information campaigns that provide reliable information and fight fake news and myths. Future vaccination intention differs in both clusters, so these results are important for developing strategies target to increase vaccination uptake for those who do not reject the COVID-19 vaccine completely.The research was funded by Carlos III Health Institute. This study was also partially funded by RICAPPS (Carlos III Health Institute, ref: RD21CIII/0003/0002). The funder had no role in the study design; collection, analysis, and interpretation of data; writing of the paper; and/or decision to submit for publication.S

How patients with COVID-19 managed the disease at home during the first wave in Spain: a cross-sectional study.

Most patients with mild COVID-19 had to stay at home trying to implement an optimal quarantine. The aim of this study was to describe the COVID-19 cases during the first wave of the pandemic in Spain, how they managed the disease at home, focusing on differences by age, as well as differences in knowledge, attitudes and preventive practices, compared with the uninfected population. An online survey was used to conduct a cross-sectional study of individuals who were 14 years or older living in Spain during the COVID-19 lockdown. The main variable was a COVID-19 case. Logistic regression models for COVID-19 cases were obtained using a backward stepwise procedure to assess the association between social variables, disease knowledge, attitudes, prevention practices and emotional impact. 3398 people completed the survey. Participants' mean age was 49.6 (SD=14.3). COVID-19 was significantly more prevalent among married people (5.3%) and those currently doing an on-site work (8.7%). Most of the COVID-19 cases stayed at home (84.0%) during the episode. There were significant age-based differences with regard to self-isolation conditions at home during the disease. COVID-19 cases showed better attitudes, practices and knowledge about disease symptoms and transmission than the uninfected population. COVID-19 cases also felt more depressed (adjusted OR: 3.46, 95% CI 1.45 to 8.26) and had better preventive behaviour than the uninfected population, such as always wearing a mask outside the home (adjusted OR 1.58, 95% CI 1.06 to 2.30). COVID-19 cases found it difficult to comply with recommended home self-isolation conditions, with differences by age group. COVID-19 had an important impact on care dependency in non-hospitalised patients, who were mostly dependent on their families for care. It is necessary to reinforce social and health services and to be ready to meet the care needs of populations during the different waves or in future epidemics.This work was supported by Instituto de Salud Carlos III through the National Tropical Diseases Research Network (RD16CIII/003/001RICET). The funders had no role in study design or in the collection, analysis and interpretation of data, or the decision to submit the article for publication.S

Análisis al sector de turismo y alojamiento en el periodo 2002-2005

El Observatorio de Epidemiología empresarial hace parte del Grupo de Investigación en Perdurabilidad Empresarial de la Facultad de Administración y tiene como misión ser una plataforma de monitoreo, investigación y difusión de estudios de salud y enfermedad de las empresas, con el fin de generar conocimiento pertinente acerca de la perdurabilidad empresarial colombiana. Por lo tanto, se ha planteado como objetivo general aplicar el método epidemiológico en el fenómeno de la empresa con el fi n de comprender sus procesos de salud y enfermedad

Análisis de la Ingesta Dietética y Composición Corporal de Corredores Universitarios

The aim of this cross-sectional study was to compare dietary intake to published recommendations and to analyze the potential relationship between body composition and dietary intake in collegiate athletes. Eighteen healthy male middle- and long-distance runners (age 20.11 ± 2.72 y; height, 174.7 ± 6.1 cm; body mass, 64.0 ± 7.7 kg), were recruited from a Mexican university track and field team at the beginning of the general preparation phase for national competitions. Participants completed three 24-hour dietary recalls, which were used to estimate dietary intake. Body composition was measured by Dual-energy X-ray absorptiometry (DXA). Athletes displayed high body fat values. Protein intake was significantly higher than published recommendations. Iron, zinc, sodium, and vitamin C intake were significantly higher than recommended values, while potassium and calcium intake were below established recommendations. No significant correlations between body composition variables (i.e body fat, lean body mass, bone mineral content) and dietary intake (i.e energy, macronutrients and selected vitamins and minerals) could be found. These findings suggest that coaches and practitioners should pay close attention to dietary intake and body composition of endurance athletes starting general preparation for competition. Future studies on changes of dietary intake and body composition during off-season and competitive phase, which also track physical activity, are warranted.El objetivo de este estudio transversal fue comparar la ingesta dietética con las recomendaciones publicadas y analizar la relación potencial entre la composición corporal y la ingesta dietética en corredores universitarios. Dieciocho atletas masculinos sanos de media y larga distancia (edad 20,11 ± 2,72 años; altura, 174,7 ± 6,1 cm; masa corporal, 64,0 ± 7,7 kg), fueron reclutados de un equipo de atletismo de una universidad mexicana al comienzo de la fase de preparación general de competiciones nacionales. Los participantes completaron tres recordatorios dietéticos de 24 horas, que se utilizaron para estimar la ingesta dietética. La composición corporal se midió mediante absorciometría de rayos X de energía dual (DXA). Los atletas mostraron altos valores de grasa corporal. La ingesta de proteínas fue significativamente mayor que las recomendaciones publicadas. La ingesta de hierro, zinc, sodio y vitamina C fue significativamente superior a los valores recomendados, mientras que la ingesta de potasio y calcio estuvo por debajo de las recomendaciones establecidas. No se encontraron correlaciones significativas entre las variables de composición corporal (es decir, grasa corporal, masa corporal magra, contenido mineral óseo) y la ingesta dietética (es decir, energía, macronutrientes y vitaminas y minerales seleccionados). Estos hallazgos sugieren que los entrenadores y los practicantes deberían prestar mucha atención a la ingesta dietética y la composición corporal de los atletas de resistencia que comienzan la preparación general para la competencia. Se justifican estudios futuros sobre los cambios en la ingesta dietética y la composición corporal durante la fase fuera de temporada y competitiva, como también un seguimiento de la actividad física

Diagnóstico al sector agrícola con predominio exportador en el periodo 2002-2005

El Observatorio de Epidemiología Empresarial hace parte del Grupo de Investigación en Perdurabilidad Empresarial de la Facultad de Administración y tiene como misión constituir una plataforma de monitoreo, investigación y difusión de estudios de salud y enfermedad de las empresas, con el fin degenerar conocimiento pertinente acerca de la perdurabilidad empresarial colombiana. Por lo tanto se ha planteado como objetivo general aplicar el método epidemiológico en el fenómeno de la empresa con el fin de comprender sus procesos de salud y enfermedad

Evaluación de la efectividad biológica de hormonales para incrementar el amarre de frutos en mandarina Fremont (Citrus reticulata Blanco).

El uso de reguladores de crecimiento es una alternativa para incrementar el porcentaje de amarre de frutos, lo cual se traduce en incrementos de la producción. Se evaluaron los efectos de la aplicación de 5 tratamientos entre ellos, 3 diferentes hormonas, un complejo hormonal y un testigo, las hormonas aplicadas correspondieron principalmente a hormonas promotoras del crecimiento. Las variables de respuesta evaluadas fueron: Porcentaje de frutos amarrados por brote, diámetro polar y ecuatorial de los frutos, calidad externa de los frutos color y textura, evaluación de la fitotoxicidad en los árboles y estimación de la producción de fruta. Los resultados de los tratamientos a base de giberelinas y de auxinas, registran mayor promedio y rendimiento de frutos en relación al testigo. La mejor producción de fruta se obtuvo en los tratamientos de auxinas y giberelinas, los cuales superaron al testigo en un 24.33% y 22.89%, respectivamente. La aplicación de las hormonas evaluadas no afectó, ni modificó la calidad de los frutos: la textura, y el color. No se presentó efecto de fitotoxicidad en ninguno de los tratamientos evaluados

Recurrent presence of the PLCG1 S345F mutation in nodal peripheral T-cell lymphomas

This work was supported by grants from Asociación Española contra el Cancer (AECC), Ministerio de Economía y Competitividad (MINECO) (SAF2013-47416-R), Instituto Salud Carlos III (ISCIII) – Fondos FEDER, MINECO-AES(RD012/0036/0060, PI10/00621, CP11/00018). RM is supported by the Fundación Conchita Rábago de la Fundación Jiménez Díaz, Madrid (Spain). JG-R is supported by a predoctoral grant from the Fundacion Investigacion Biomedica Puerta de Hierro. Salary support to SG is provided by ISCIII-FEDER (CP11/00018). MS-B is supported by a Miguel Servet contract from ISCIII-FEDER (CP11/00018). The Instituto de Investigación Marqués de Valdecilla (IDIVAL) is partly funded by the Sociedad para el Desarrollo Regional de Cantabria (SODERCAN)