164 research outputs found
Manejo de malezas durante y después del establecimiento de maní perenne.
A field study was conducted to evaluate the effect of dimethenamid and imazethapyr followed by clethodim and bromoxynil, on rhizoma perennial peanut (Arachis glabrata) during and after establishment.There were no significant differences in any of the parameters measured among rhizoma perennial peanut accessions as a result of the effects of herbicides. Excellent grass control was obtained when dimethenamid (preemergence) at 1.68 and 3.36 kg ai/ha was applied during the first month as compared with the use of imazethapyr. At 26 weeks after herbicide application (WAH) excellent grass control was obtained in all herbicide treatments. At 52 WAH no differences were observed for broadleaf and grass density. No differences were detected for dry weight of rhizoma perennial peanut and weeds among herbicide treatments at the 26- and 52-WAH harvests. Plots receiving imazethapyr as an early postemergence (POE) had 44 g/m2 more dry weight of weeds than plots with dimethenamid at the lowest rate, but no differences were found among the other treatments. The lowest weight of rhizoma perennial peanut was with imazethapyr early POE, as compared with the three other herbicide treatments. No difference was observed with dimethenamid at either rate. After two years, density of broadleaves was the highest (55.6 plants per square meter) with imazethapyr applied early POE. Density of grasses was lower with imazethapyr preemergence and dimethenamid at a lower rate than with the other two herbicide treatments. Overall, taking into account all rates and dates of herbicide applications, the best weed control was obtained with the early application dates. Se estableció un experimento de campo para evaluar el efecto de dimethenamid e imazethapyr seguido de clethodim y bromoxynil en maní perenne (Arachis glabrata), en y durante el establecimiento del mismo. No hubo diferencias significativas entre las variedades de maní perenne para el efecto de herbicida en ninguno de los parámetros medidos. Se obtuvo un excelente control de gramíneas con dimethenamid a 1.68 y 3.36 kg ¡a/ha el primer mes después de la aplicación en comparación con la aplicación de imazethapyr. A las 26 semanas después de la aplicación de los herbicidas se obtuvo excelente control de gramíneas con todos los tratamientos de herbicidas. A las 52 semanas después de la aplicación no hubo diferencias en la densidad de malezas de hoja ancha ni de gramíneas en ninguno de los tratamientos de herbicidas. No hubo diferencias en el peso seco del maní ni en el de malezas entre los tratamientos de herbicidas a las 26 y 52 semanas después de la aplicación. El peso seco de las malezas que recibieron imazethapyr postemergente temprano fue 44 g/m2 mayor que el de las malezas que recibieron dimethenamid a la dosis menor, pero no se observó diferencias entre los otros tratamientos. El menor rendimiento del maní perenne se obtuvo con la aplicación de imazethapyr postemergente temprano. Después de dos años de establecido, imazethapyr aplicado postemergente temprano produjo la mayor densidad de malezas de hoja ancha, con 55.6 plantas por metro cuadrado. La densidad de gramíneas fue menor con imazethapyr preemergente y con dimethenamid a la dosis de 1.68 kg ¡a/ha que con los otros dos tratamientos. En general, las aplicaciones de los herbicidas de forma preemergente resultaron en mayor rendimiento del maní perenne.
SALUD MENTAL Y BIENESTAR DESDE EL PUNTO DE VISTA DE DOCENTES UNIVERSITARIOS
La presente investigación ha sido desarrollada en el escenario académico de una universidad venezolana. Su propósito es identificar la percepción del bienestar subjetivo en el trabajo de docentes universitario, lo cual conlleva a describir las implicaciones de dicha percepción de bienestar con la salud mental y el trabajo docente universitario. Se asumió la metodología cualitativa con diseño de estudio de caso, participaron los docentes de mayor antigüedad y con escalafón de ordinario, en las categorías desde asistente, agregado, asociado y titular, la muestra fue propositiva de 20 docentes. Se utilizó la entrevista en profundidad y para el análisis de los datos, el cual fue realizado mediante análisis temático con el apoyo del software Atlas Ti. Concluyó en el concepto de salud mental coexisten elementos de tipo positivo tales como una tendencia positiva de bienestar además del hecho de sentirse bien. Por otro lado incluyeron visiones negativas como son las alteraciones y el desequilibrio emocional. Por lo tanto la visión de bienestar desde los docentes universitarios presenta una perspectiva ambigua. Abstract This research has been developed in the academic scene at a Venezuelan university (UNEG). Its purpose is to identify the perception of subjective well-being in the work of university teachers, which leads to describe the implications of that perception of mental health wellness and work in university teaching. We started design methodology qualitative case study, involving more senior teachers and regular ladder in the categories from assistant, added, partner and owner, the sample was purposive 20 teachers. Was used in-depth interviews and data analysis, which was conducted through thematic analysis with the support of Atlas Ti software. Concluded on the concept of coexisting mental health of positive elements such as a positive trend of welfare in addition to feeling good. On the other hand included negative views such as emotional disturbances and imbalance. Therefore the vision of being university teachers from presenting a view unambiguous. Palabras claves: salud mental, bienestar, trabajo, docencia universitaria.
Mobile health application to support CPAP therapy in obstructive sleep apnoea: design, feasibility and perspectives
Background: Current continuous positive airway pressure (CPAP) devices can be monitored remotely; however, in-person visits are kept for clinical follow-up in order to promote CPAP use and resolve potential side-effects. Mobile health is a promising way to provide remote and easy clinical control for CPAP follow-up and support. We aimed to evaluate the feasibility and acceptance by obstructive sleep apnoea (OSA) patients and healthcare professionals of a newly designed mobile app (Appnea-Q) to promote clinical control through a self-monitoring tool for patients with CPAP supervised by sleep professionals. Methods: Appnea-Q incorporates a simple follow-up questionnaire with automated responses, together with frequent problems and lifestyle recommendations sections. Feasibility, acceptance and usefulness were assessed. First, an internal validation was performed during outpatient CPAP follow-up visits with sleep professionals from various sleep units. Second, an external validation was performed in a subgroup of 15 patients at home. Results: Most patients (n=75) considered the app useful and were willing to use it and recommend it (72-88%). Up to 64.87% agreed on its capacity to reduce hospital visits. Appnea-Q was rated as acceptable (79.37 +/- 19.29) by the system usability score. Sleep professionals (n=30) concurred on its usefulness for OSA patient follow-up, particularly during the first month of CPAP therapy. The external validation showed its feasibility among 11 out of 15 patients and their data were received accordingly on the professionals' web platform. Conclusions: According to our validation process, and the viewpoints of the patients and professionals, our new mobile app is a feasible and well-received tool for personal OSA management. Future clinical trials should substantiate its performance and cost-effectiveness in the clinical arena
A dedicated electric oven for characterization of thermoresistive polymer nanocomposites
AbstractThe construction, characterization and control of an electric oven dedicated to the study of thermoresistive polymer nanocomposites is presented. The oven is designed with a heating plate capable of reaching 300°C with a resolution of 0.3°C and an area of uniform temperature of 3.8cm×2.5cm. The temperature is regulated by means of a discrete proportional–integral–derivative controller. A heat transfer model comprising three coupled non-linear differential equations is proposed to predict the thermal profiles of the oven during heating and cooling, which are experimentally verified. The oven is used for thermoresistive characterization of polymer nanocomposites manufactured from a polysulfone polymer and multiwall carbon nanotubes
La restauración de la villa romana de La Ontavia (Terrinches, Ciudad Real)
En el mes de julio de 2010 se iniciaron las labores de conservación y restauración
en el yacimiento romano de La Ontavia (Terrinches, Ciudad Real). Durante
cuatro meses se han simultaneado estos trabajos con la excavación arqueológica,
en la que han colaborado once alumnos de la Escuela Superior de
Conservación y Restauración de Bienes Culturales de la Comunidad de Madrid,
bajo la dirección del equipo técnico, realizando prácticas para completar su formación.
La intervención llevada a cabo ha estado enfocada a minimizar el efecto
de los agentes de deterioro a los que se halla expuesto el yacimiento, que
se encuentra al aire libre. El presente artículo tiene como finalidad la difusión
de los trabajos de conservación y restauración realizados durante esta campaña,
prestando especial atención a la metodología y a los materiales utilizadosIn July 2010 conservation and restoration work began at the Roman site of La
Ontavia (Terrinches, Ciudad Real). For four months, the work was carried
out alongside the archaeological excavation, involving eleven students
from the Madrid School of Cultural Asset Conservation and Restoration, doing
work experience under the guidance of a technical team to complete their
training. The intervention focused on minimising the effect of the deterioration
factors that this open-air site has been exposed to. This article aims to
provide a report of the conservation and restoration work carried out in this
campaign, paying special attention to the methodology and materials use
Comprehensive management of obstructive sleep apnea by telemedicine: Clinical improvement and cost-effectiveness of a Virtual Sleep Unit. A randomized controlled trial
Introduction: Obstructive sleep apnea (OSA) is a prevalent disease associated with significant morbidity and high healthcare costs. Information and communication technology could offer cost-effective management options. Objectives: To evaluate an out-of-hospital Virtual Sleep Unit (VSU) based on telemedicine to manage all patients with suspected OSA, including those with and without continuous positive airway pressure (CPAP) therapy.Methods: This was an open randomized controlled trial. Patients with suspected OSA were randomized to hospital routine (HR) or VSU groups to compare the clinical improvement and cost-effectiveness in a non-inferiority analysis. Improvement was assessed by changes in the Quebec Sleep Questionnaire (QSQ), EuroQol (EQ-5D and EQ-VAS), and Epworth Sleepiness Scale (ESS). The follow-up was 3 months. Cost-effectiveness was assessed by a Bayesian analysis based on quality-adjusted life-years (QALYs).Results: The HR group (n: 92; 78% OSA, 57% CPAP) compared with the VSU group (n: 94; 83% OSA, 43% CPAP) showed: CPAP compliance was similar in both groups, the QSQ social interactions domain improved significantly more in the HR group whereas the EQ-VAS improved more in the VSU group. Total and OSA-related costs were lower in the VSU group than the HR. The Bayesian cost-effectiveness analysis showed that VSU was cost-effective for a wide range of willingness to pay for QALYs. Conclusions: The VSU offered a cost-effective means of improving QALYs than HR. However, the assessment of its clinical improvement was influenced by the choice of the questionnaire; hence, additional measurements of clinical improvement are needed. Our findings indicate that VSU could help with the management of many patients, irrespective of CPAP use
12mm line survey of the dense molecular gas towards the W28 field TeV gamma-ray sources
We present 12mm Mopra observations of dense molecular gas towards the W28
supernova remnant (SNR) field. The focus is on the dense molecular gas towards
the TeV gamma-ray sources detected by the H.E.S.S. telescopes, which likely
trace the cosmic-rays from W28 and possibly other sources in the region. Using
the NH3 inversion transitions we reveal several dense cores inside the
molecular clouds, the majority of which coincide with high-mass star formation
and HII regions, including the energetic ultra-compact HII region G5.89-0.39. A
key exception to this is the cloud north east of W28, which is well-known to be
disrupted as evidenced by clusters of 1720MHz OH masers and broad CO line
emission. Here we detect broad NH3, up to the (9,9) transition, with linewidths
up to 16 km/s. This broad NH3 emission spatially matches well with the TeV
source HESS J1801-233 and CO emission, and its velocity dispersion distribution
suggests external disruption from the W28 SNR direction. Other lines are
detected, such as HC3N and HC5N, H2O masers, and many radio recombination
lines, all of which are primarily found towards the southern high-mass star
formation regions. These observations provide a new view onto the internal
structures and dynamics of the dense molecular gas towards the W28 SNR field,
and in tandem with future higher resolution TeV gamma-ray observations will
offer the chance to probe the transport of cosmic-rays into molecular clouds.Comment: 18 pages, 10 figures, 5 tables, accepted for publication in MNRAS.
Online appendices containing additional molecular line: fit parameters, maps,
PV plots & spectra, will be available through MNRA
Knowledge to Serve the City: Insights from an Emerging Knowledge-Action Network to Address Vulnerability and Sustainability in San Juan, Puerto Rico
This paper presents initial efforts to establish the San Juan Urban Long-Term Research Area Exploratory (ULTRA-Ex), a long-term program aimed at developing transdisciplinary social-ecological system (SES) research to address vulnerability and sustainability for the municipality of San Juan. Transdisciplinary approaches involve the collaborations between researchers, stakeholders, and citizens to produce socially-relevant knowledge and support decision-making. We characterize the transdisciplinary arrangement emerging in San Juan ULTRA-Ex as a knowledge-action network composed of multiple formal and informal actors (e.g., scientists, policymakers, civic organizations and other stakeholders) where knowledge, ideas, and strategies for sustainability are being produced, evaluated, and validated. We describe in this paper the on-the-ground social practices and dynamics that emerged from developing a knowledge-action network in our local context. Specifically, we present six social practices that were crucial to the development of our knowledge-action network: 1) understanding local framings; 2) analyzing existing knowledge-action systems in the city; 3) framing the social-ecological research agenda; 4) collaborative knowledge production and integration; 5) boundary objects and practices; and 6) synthesis, application, and adaptation. We discuss key challenges and ways to move forward in building knowledge-action networks for sustainability. Our hope is that the insights learned from this process will stimulate broader discussions on how to develop knowledge for urban sustainability, especially in tropical cities where these issues are under-explored
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