Search results for " space"
showing 10 items of 4562 documents
On the CAT(0) dimension of 2-dimensional Bestvina-Brady groups
2002
Let K be a 2-dimensional finite flag complex. We study the CAT(0) dimension of the `Bestvina-Brady group', or `Artin kernel', Gamma_K. We show that Gamma_K has CAT(0) dimension 3 unless K admits a piecewise Euclidean metric of non-positive curvature. We give an example to show that this implication cannot be reversed. Different choices of K lead to examples where the CAT(0) dimension is 3, and either (i) the geometric dimension is 2, or (ii) the cohomological dimension is 2 and the geometric dimension is not known.
The Bishop-Phelps-Bollobás property for bilinear forms and polynomials
2014
For a $\sigma$-finite measure $\mu$ and a Banach space $Y$ we study the Bishop-Phelps-Bollobás property (BPBP) for bilinear forms on $L_1(\mu)\times Y$, that is, a (continuous) bilinear form on $L_1(\mu)\times Y$ almost attaining its norm at $(f_0,y_0)$ can be approximated by bilinear forms attaining their norms at unit vectors close to $(f_0,y_0)$. In case that $Y$ is an Asplund space we characterize the Banach spaces $Y$ satisfying this property. We also exhibit some class of bilinear forms for which the BPBP does not hold, though the set of norm attaining bilinear forms in that class is dense.
Du ciel noir à l'environnement nocturne : la construction d'un nouveau front de protection de la nature
2020
International audience; Depuis les années 1970 plusieurs domaines d’expertise scientifique ont contribué à faire émerger une nouvelle dimension de la protection de l’environnement liés aux effets dégradants de la pollution lumineuse. Cette dernière constitue en soi un objet de controverse entre sciences, notamment sur les différentes façons de la saisir et la définir en tant qu’objet et que fait. Nous retiendrons ici pour qualifier cette forme de pollution le caractère d’un excès de lumière artificielle entrainant des impacts sur les écosystèmes et sur la santé humaine.L’histoire du mouvement de lutte contre l’expansion de l’éclairage artificiel commence à être relativement connue, dans le …
Managing collapsed boundaries in global work
2023
Global workers have long contended with the challenges of working across geographical, temporal, and cultural boundaries enabled by communication technologies. However, the global work research has rarely intersected with the literature on work–home boundary management—which has been brought to the forefront due to the forced move to remote work during the Covid-19 pandemic. Drawing on a qualitative field study of 55 in-depth interviews with global workers from a large organization headquartered in the Nordics, we found that global workers drew on sociomaterial affordances to manage both global work and work–home boundaries through strategies of boundary support and boundary collapse. Altho…
The Gaia-ESO Survey: The inner disk, intermediate-age open cluster Trumpler 23
2017
Full list of authors: Overbeek, J. C.; Friel, E. D.; Donati, P.; Smiljanic, R.; Jacobson, H. R.; Hatzidimitriou, D.; Held, E. V.; Magrini, L.; Bragaglia, A.; Randich, S.; Vallenari, A.; Cantat-Gaudin, T.; Tautvaišienė, G.; Jiménez-Esteban, F.; Frasca, A.; Geisler, D.; Villanova, S.; Tang, B.; Muñoz, C.; Marconi, G. Carraro, G.; San Roman, I.; Drazdauskas, A.; Ženovienė, R.; Gilmore, G.; Jeffries, R. D.; Flaccomio, E.; Pancino, E.; Bayo, A.; Costado, M. T.; Damiani, F.; Jofré, P.; Monaco, L.; Prisinzano, L.; Sousa, S. G.; Zaggia, S.
Comparison of Classroom-Based Sedentary Time and Physical Activity in Conventional Classrooms and Open Learning Spaces Among Elementary School Studen…
2021
European children and adolescents spend most of their daily life and especially their school hours being sedentary which may increase their risk for chronic non-communicable diseases later in life. After the curriculum reform of Finnish basic education in 2014, most of the new or renovated comprehensive schools in Finland incorporate open and flexible classroom designs. Their open learning spaces may provide students opportunities to reduce sedentary behavior during school hours. Thus, waist-worn accelerometers were used to assess classroom-based sedentary time (ST), the number of breaks from sedentary time (BST), and physical activity (PA) among cross-sectional samples of 3rd and 5th grade…
Enabling Settings for Learning : Observations Related to Design Communication
2020
The paper draws on two cases of learning settings that were converted to meet up-to-date educational requirements within these learning contexts. The authors address the role of stakeholder perspectives. Focusing on the learning situation, they present an articulation tool to aid dialogue between key stakeholder perspectives in a (re)design process. Dialogue is a way to figure out relevant issues and to establish the common ground between participants. The goal of a redesign process is that user requirements are well understood, and the design is embedded into local practices, informed of constraints and aware of potential opportunities regarding educational technology. peerReviewed
Comparison of Classroom-based Sedentary Time and Physical Activity in Conventional Classrooms and Open Learning Spaces Among Elementary School Studen…
2021
European children and adolescents spend most of their daily life and especially their school hours being sedentary which may increase their risk for chronic non-communicable diseases later in life. After the curriculum reform of Finnish basic education in 2014, most of the new or renovated comprehensive schools in Finland incorporate open and flexible classroom designs. Their open learning spaces may provide students opportunities to reduce sedentary behavior during school hours. Thus, waist-worn accelerometers were used to assess classroom-based sedentary time (ST), the number of breaks from sedentary time (BST), and physical activity (PA) among cross-sectional samples of 3rd and 5th grade…
Associations of Classroom Design and Classroom-Based Physical Activity with Behavioral and Emotional Engagement among Primary School Students
2021
Educational reforms worldwide have resulted in schools increasingly incorporating open and flexible classroom designs. Open learning spaces may contribute to a student’s behavioral and emotional school engagement directly and by facilitating classroom-based physical activity (CPA). We investigated the associations between accelerometer-assessed CPA and student ratings of task-focused behavior and attitude towards school as indicators for behavioral and emotional engagement, respectively, with the associations of gender, grade, and classroom design on CPA among 206 3rd and 5th grade students in open learning spaces and conventional classrooms. Structural equation modelling showed open classr…
Koulun toimintakulttuuri avautuvissa oppimistiloissa : etnografinen tutkimus uuteen koulurakennukseen muuttamisesta
2018
The purpose of this ethnographic study was to describe and understand processes related to the formation of an operating culture when moving to new, open learning spaces. In this context, an open learning space is a semi-open facility that serves as a home classroom but can also be combined into a larger, shared space. The study examined the formation of a school’s operating culture through ideals around the use of facilities and furniture that arise from new, open learning spaces. I was particularly interested in users’ tensive relationships with open learning spaces and the opportunities to use them in day-to-day teaching. In previous studies, open learning spaces and their use have prima…