Search results for "Full model"
showing 3 items of 3 documents
Association between physical, psychological and social frailty and health-related quality of life among older people
2019
Abstract Background Studies on the association between frailty and health-related quality of life (HRQoL) are scarce and show contradictory results. This study aimed to evaluate the association between physical, psychological and social frailty and HRQoL among community-dwelling older people. Methods A cross-sectional study was performed with baseline data collected in 2015 from the Urban Health Centers Europe (UHCE) project in five European countries, the United Kingdom, Greece, Croatia, The Netherlands and Spain. A total of 2325 participants were included in the baseline measurements of the Urban Health Centers Europe project; 2167 participants (mean age = 79.7; SD=5.6) were included in t…
An operatorial description of desertification
2016
We propose a simple theoretical model for desertification processes based on three actors (soil, seeds, and plants) on a two-dimensional lattice. Each actor is described by a time dependent fermionic operator, and the dynamics is ruled by a self-adjoint Hamilton-like operator. We show that even taking into account only a few parameters, accounting for external actions on the ecosystem or the response to positive feedbacks, the model provides a plausible description of the desertification process, and can be adapted to different ecological landscapes. We first describe the simplified model in one cell. Then, we define the full model on a two-dimensional region, taking into account additional…
School burnout, depressive symptoms and engagement : Their combined effect on student achievement
2017
Abstract Prior studies have shown that student burnout becomes more prevalent during adolescence and is associated with both depressive symptoms and school engagement. Little is known about how burnout, engagement, and depressive symptoms jointly affect students’ school achievement in terms of grades and skipping class. The main purpose of the current study was to analyse these variables within a full model in order to examine the direct and indirect effects of burnout, engagement and depression on student achievement, while controlling for gender and age. Participants were 210 Italian high school students aged 14 to 16. Student burnout was found to exert the strongest effect on school achi…