Field Statistics in a One-Dimensional Reverberation Chamber Model

This work focuses on building a fairly simple yet physically appropriate 1D model for a Reverberation Chamber which claims to be able to analytically predict the statistical behavior of such a chamber, without forsaking to the benefits of deterministic models. The statistical properties are introduced by varying the size of a 1D stirrer or the cavity size itself. A validation analysis shows agreement with other theories and measured results on real RCs. Field statistics in undermoded regime is examined. A radiated emission test is defined and shows reliable matching with reality. The field performance near the conducting walls is investigate

Public sector workers' mental health in Argentina: Comparative psychometrics of the perceived stress scale

Given that Argentinian public-sector workers are highly exposed to stressful conditions, and that the psychometric properties of the widely used Perceived Stress Scale (PSS) should be evaluated in different settings, this work aimed to compare the psychometric properties of the Latin American Spanish PSS-10 and PSS-4 and to identify the optimal scale for stress assessment. Methods: A sample of 535 participants was randomly divided into 2 groups to evaluate dimensionality by exploratory and confirmatory factor analyses. The reliability of both scales was also evaluated. Convergent validity was estimated using the Executive Complaints Questionnaire, the average variance extracted, and the composite reliability. Discriminant validity was based on the correlation with the Utrecht Work Engagement Scale and the phi-square correlation between the components. Results: The factor analyses supported bidimensionality of the PSS-10 (stress and coping), which showed a better fit than the PSS-4. Moreover, the reliability of the PSS-10 was higher, whereas the PSS-4 did not achieve adequate values of internal consistency. The PSS-10 was also correlated significantly with all validation scales, and presented proper internal convergent and divergent validity. Conclusions: The PSS-10 is a reliable and structurally valid instrument to measure perceived stress and coping in a Latin American Spanish-speaking population with high work demands, and the findings of this study expand our knowledge on the geographical and sociocultural applicability of the PSS.Fil: Miranda, Agustín Ramiro. Universidad Nacional de Córdoba. Facultad de Medicina. Escuela de Fonoaudiología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Ciencias de la Salud. Universidad Nacional de Córdoba. Instituto de Investigaciones en Ciencias de la Salud; ArgentinaFil: Scotta, Ana Veronica. Universidad Nacional de Córdoba. Facultad de Medicina. Escuela de Fonoaudiología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Ciencias de la Salud. Universidad Nacional de Córdoba. Instituto de Investigaciones en Ciencias de la Salud; ArgentinaFil: Méndez, Ana Lucía. Universidad Nacional de Córdoba. Facultad de Medicina. Escuela de Fonoaudiología; ArgentinaFil: Serra, Silvana Valeria. Universidad Nacional de Córdoba. Facultad de Medicina. Escuela de Fonoaudiología; ArgentinaFil: Soria, Elio Andres. Universidad Nacional de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Ciencias de la Salud. Universidad Nacional de Córdoba. Instituto de Investigaciones en Ciencias de la Salud; Argentin

The Rotating Molecular Structures and the Ionized Outflow Associated with IRAS 16547-4247

We present VLA 1.3 cm radio continuum and water maser observations as well as SMA SO$_2$ (226.300 GHz) and 1.3 mm dust continuum observations toward the massive star formation region IRAS 16547-4247. We find evidence of multiple sources in the central part of the region. There is evidence of a rotating structure associated with the most massive of these sources, traced at small scales (~50 AU) by the water masers. At large scales (~1000 AU) we find a velocity gradient in the SO2 molecular emission with a barely resolved structure that can be modeled as a rotating ring or two separate objects. The velocity gradients of the masers and of the molecular emission have the same sense and may trace the same structure at different size scales. The position angles of the structures associated with the velocity gradients are roughly perpendicular to the outflow axis observed in radio continuum and several molecular tracers. We estimate the mass of the most massive central source to be around 30 solar masses from the velocity gradient in the water maser emission. The main source of error in this estimate is the radius of the rotating structure. We also find water masers that are associated with the large scale molecular outflow of the system, as well as water masers that are associated with other sources in the region. Our results suggest that the formation of this source, one of the most luminous protostars or protostellar clusters known, is taking place with the presence of ionized jets and disk-like structures.Comment: 26 pages, 7 figure

Positive correlation between proteasome activity and polyphenols in the telencephalon of adult female mice

Introduction: Proteasome regulates proteostasis, and can be compromised in neurodegenerative diseases. Thus, our aim was to correlate the activity of proteasome to the level of polyphenols in telencephalon during murine adulthood. Methods: Proteasome activity, polyphenols and other variables (glucose and hydroperoxides) were analysed in Balb/c female telencephala (n = 20, age = 4-12 months), using multivariate methods. Results: The following values were found: proteasome activity = 3.1 ± 0.6 FI/µg of tissue proteins, glucose = 0.1 ± 0.0 µg/µg, hydroperoxides = 363.4 ± 96.6 OD/µg, and polyphenols = 0.1 ± 0.0 ng/µg. Polyphenols reduced during aging showed a direct correlation with proteasome (Pearson’s coefficient = 0.43, p = 0.0590, and a multivariate linear regressive coefficient = 17.85, p = 0.0216), with glucose and hydroperoxides being not involved (p&gt;0.1). This correlation was confirmed by partial least square regression (beta = 0.67). Conclusion: Proteasome activity can be affected during ageing, and promoted by telencephalic polyphenol levels. Thus, these diet compounds might exert benefits in adult brain.</p

Evaluación del compromiso en el amamantamiento de mujeres puérperas con escala UWES-17

Promotion and monitoring of breastfeeding require reliable and valid instruments that allow studying the engagement of itself. Thus, the aim of this study was to analyze the psychometric properties of the Utrecht Work Engagement Scale (UWES-17) for the assessment of engagement in breastfeeding practices among 324 postpartum Argentinian women. The UWES-17, BreastfeedingSelf-Efficacy Scale, Postpartum Depression Scale, and a sociodemographic questionnaire were applied. Moreover, reliability, validity, dimensionality, sensitivity, and specificity were analyzed. The UWES-17 demonstrated adequate levels of internal consistency, and its three-dimensional structure was confirmed. Bifactorial analysis supported its usage, and the model verified its external validity. The results validate the UWES-17 as a valid and reliable tool for assessing breastfeeding engagement, thus making it suitable for implementation in clinical and scientific contexts to support interdisciplinary approaches to breastfeeding.La promoción y el seguimiento de la lactancia materna necesita contar con instrumentos fiables y válidos que permitan estudiar el grado de compromiso con el amamantamiento. El objetivo fue analizar las propiedades psicométricas de la Escala de Compromiso de Utrecht (UWES-17) para evaluar el compromiso en la práctica del amamantamiento en 324 mujeres puérperas argentinas. Se utilizaron los instrumentos UWES-17, Escala de Autoeficacia para la Lactancia Materna, Escala de Depresión Postparto y cuestionario sociodemográfico. Se analizaron la fiabilidad, validez, dimensionalidad, sensibilidad y especificidad. El UWES-17 mostró niveles adecuados de consistencia interna y se confirmó su estructura tridimensional. El análisis bifactorial confirmó su utilidad y el modelo comprueba su validez externa. Los hallazgos confirman que el UWES-17 es un instrumento válido y fiable para la medición del compromiso en el amamantamiento, ya que puede ser utilizado en el ámbito clínico y científico para el abordaje interprofesional de la lactancia humana

Normal Values Determination for High Resolution Esophageal Manometry Using Sitting Viscous Solution Swallows. Results of a Multicenter Study in Healthy Volunteers

Q1Q1Introduction: It has been suggested that a more physiologic esophageal manometry study protocol, including non-liquid solutions and a sitting position, could improve the test performance. For the specificity determination of putative findings it is necessary to determine normal values Aim: To determine normal values for sitting viscous solution swallows in healthy volunteers using high-resolution esophageal manometry.https://orcid.org/0000-0002-9219-4548Revista Nacional - Indexad