The effect of telework on emotional exhaustion and task performance via work overload: The moderating role of self-leadership

This study developed a framework that explains how and when telework is related to emotional exhaustion and task performance, by conceiving work overload as a mediator and self-leadership as a moderator. We conducted two studies. Study 1 aimed to understand whether telework would be related to emotional exhaustion and task performance and if work overload would mediate such relationships. Study 2 analyzed whether self-leadership was a significant moderator of the mediated relations found in Study 1. The hypotheses were tested in a sample of 207 (in Study 1) and 272 (in Study 2) participants, that were exclusively teleworking. The results were analyzed using PROCESS macro in SPSS. The results of study 1 showed that telework dimensions were negatively related to work overload, which consequently decreased emotional exhaustion and increased task performance. In Study 2, self-leadership moderated the indirect effect of work overload on the relationship between telework and emotional exhaustion, such that the indirect effect was stronger for those who scored higher in self-leadership. However, it was not significant for task performance. This paper adds to research on telework by focusing on the employee’s mental health and performance, in the context of mandatory confinement. The authors identified telework dimensions that may act as resources to cope with the increased work overload inherent to telework, as well as the importance of personal resources in these relationships.info:eu-repo/semantics/acceptedVersio

Validation of the E-Work Life Scale for the Portuguese population

The E-Work Life Scale (EWLS), developed by Grant et al. (2019), is an instrument used to assess the quality of life when teleworking, regarding the interference between work and personal life domains, perceptions of productivity and effectiveness, flexibility, and organizational trust. This research aims to present the validation of the EWLS to the Portuguese population, through two different studies. The goal of the first study was to explore the factor structure of the scale through exploratory factor analysis (N = 207 teleworkers). The second study (N = 272) was intended to validate the scale factor structure and analyze its convergent validity, discriminant validity, and criterion validity. The findings from both studies showed that the scale had strong reliability, and a consistent factor structure, and demonstrated convergent, discriminant, and criterion validity. Thus, we conclude that the Portuguese version of the EWLS is a valid instrument to be used among teleworkers.info:eu-repo/semantics/publishedVersio

Limit cycles for dynamic crawling locomotors with periodic prescribed shape

We study the asymptotic evolution of a family of dynamic models of crawling locomotion, with the aim to introduce a well-posed characterization of a gait as a limit behaviour. The locomotors, which might have a discrete or continuous body, move on a line with a periodic prescribed shape change, and might possibly be subject to external forcing (e.g. crawling on a slope). We discuss how their behaviour is affected by different types of friction forces, including also set-valued ones such as dry friction. We show that, under mild natural assumptions, the dynamics always converge to a relative periodic solution. The asymptotic average velocity of the crawler yet might still depend on its initial state, so we provide additional assumption for its uniqueness. In particular, we show that the asymptotic average velocity is unique both for strictly monotone friction forces, and also for dry friction, provided in the latter case that the actuation is sufficiently smooth (for discrete models) or that the friction coefficients are always nonzero (for continuous models). We present several examples and counterexamples illustrating the necessity of our assumptions

SN contributions to GRB lightcurves

Several of the nearer GRB afterglows (up to z ∼ 1) show bumps in their lightcurves that have been interpreted as contributions from associated SNae. Thebumps arecustomarily modelled likethet ype-Ic SN 1998bw, but wein vestigate here, for several low-z GRBs, whether other SN types might offer alternatives. While several SN types are ruled out, or are unlikely, a type “II-bl” could also explain the observations

Subaortic Stenosis Following Anatomic Correction for Transposition of the Great Arteries

Os autores descrevem o caso clínico de uma criança do sexo masculino, com 12 anos de idade, com diagnóstico pós-natal de transposição das grandes artérias com comunicação interventricular, submetida a switch arterial e encerramento da comunicação interventricular. Durante o seguimento pós-operatório detectou-se um obstáculo entre o ventrículo esquerdo e a aorta ascendente que foi, inicialmente, de grau ligeiro. No último ano começou a referir sintomatologia (cansaço para esforços moderados). Na avaliação efectuada detectou-se uma estenose aórtica subvalvular grave, tendo o doente sido submetido a tratamento cirúrgico, com bom resultado. A estenose aórtica subvalvular é uma complicação rara, que tem sido descrita em estudos de follow-up de switch arterial, sobretudo nas situações em que o defeito primário é a transposição das grandes artérias com comunicação interventricular

Heterogeneity in susceptibility to infection can explain high reinfection rates

Heterogeneity in susceptibility and infectivity is inherent to infectious disease transmission in nature. Here we are concerned with the formulation of mathematical models that capture the essence of heterogeneity while keeping a simple structure suitable of analytical treatment. We explore the consequences of host heterogeneity in the susceptibility to infection for epidemiological models for which immunity conferred by infection is partially protective, known as susceptible-infected-recovered-infected (SIRI) models. We analyze the impact of heterogeneity on disease prevalence and contrast the susceptibility profiles of the subpopulations at risk for primary infection and reinfection. We present a systematic study in the case of two frailty groups. We predict that the average rate of reinfection may be higher than the average rate of primary infection, which may seem paradoxical given that primary infection induces life-long partial protection. Infection generates a selection mechanism whereby fit individuals remain in S and frail individuals are transferred to R. If this effect is strong enough we have a scenario where, on average, the rate of reinfection is higher than the rate of primary infection even though each individual has a risk reduction following primary infection. This mechanism may explain high rates of tuberculosis reinfection recently reported. Finally, the enhanced benefits of vaccination strategies that target the high-risk groups are quantified.http://dx.doi.org/10.1016/j.jtbi.2009.03.01

Vibration analysis and modal identification of a circular cable-stayed footbridge

Vibration measurements and modal identification were performed on a footbridge as part of the commissioning tests. The deck presents a circular configuration, in plant, and is suspended from eight cables connecting it to the extremity of a steel mast anchored to a concrete bulk situated on the riverside. The dynamic measurements were aimed to control the force installed in the cables during the tension operation and to characterize the dynamic parameters through output-only modal identification techniques in order to calibrate a Finite Element model. At last, groups of pedestrians crossed the bridge at various speeds allowing conclusions about the vibration amplitudes that can be expected during real use of the bridge

First Trimester Aneuploidy Screening Program for Preeclampsia Prediction in a Portuguese Obstetric Population

Objective. To evaluate the performance of a first trimester aneuploidy screening program for preeclampsia (PE) prediction in a Portuguese obstetric population, when performed under routine clinical conditions. Materials and Methods. Retrospective cohort study of 5672 pregnant women who underwent routine first trimester aneuploidy screening in a Portuguese university hospital from January 2009 to June 2013. Logistic regression-based predictive models were developed for prediction of PE based on maternal characteristics, crown-rump length (CRL), nuchal translucency thickness (NT), and maternal serum levels of pregnancy-associated plasma protein-A (PAPP-A) and free beta-subunit of human chorionic gonadotropin (free β-hCG). Results. At a false-positive rate of 5/10%, the detection rate for early-onset (EO-PE) and late-onset (LO-PE) PE was 31.4/45.7% and 29.5/35.2%, respectively. Although both forms of PE were associated with decreased PAPP-A, logistic regression analysis revealed significant contributions from maternal factors, free β-hCG, CRL, and NT, but not PAPP-A, for prediction of PE. Conclusion. Our findings support that both clinical forms of EO-PE and LO-PE can be predicted using a combination of maternal history and biomarkers assessed at first trimester aneuploidy screening. However, detection rates were modest, suggesting that models need to be improved with additional markers not included in the current aneuploidy screening programs

Global embedding of the Kerr black hole event horizon into hyperbolic 3-space

An explicit global and unique isometric embedding into hyperbolic 3-space, H^3, of an axi-symmetric 2-surface with Gaussian curvature bounded below is given. In particular, this allows the embedding into H^3 of surfaces of revolution having negative, but finite, Gaussian curvature at smooth fixed points of the U(1) isometry. As an example, we exhibit the global embedding of the Kerr-Newman event horizon into H^3, for arbitrary values of the angular momentum. For this example, considering a quotient of H^3 by the Picard group, we show that the hyperbolic embedding fits in a fundamental domain of the group up to a slightly larger value of the angular momentum than the limit for which a global embedding into Euclidean 3-space is possible. An embedding of the double-Kerr event horizon is also presented, as an example of an embedding which cannot be made global.Comment: 16 pages, 13 figure