Search results for " method"
showing 10 items of 10455 documents
Probing NiO nanocrystals by EXAFS spectroscopy
2010
Abstract The structure relaxation in nanocrystalline NiO (nano-NiO, 13 nm crystallite size) has been studied by X-ray absorption spectroscopy at the Ni K-edge at 300 K. Conventional single-scattering analysis of the EXAFS signals from the first two coordination shells showed a lattice volume expansion by about 1% and a contraction of the Ni–O bonds by about 0.5% in nano-NiO compared to microcrystalline NiO. A more sophisticated approach, based on a combination of classical molecular dynamics and ab initio multiple-scattering EXAFS theory, allowed us to interpret both static relaxation and lattice dynamics in nano-NiO.
On the Low-Lying Excited States ofsym-Triazine-Based Herbicides
2005
We report a joint computational and luminescence study on the low-lying excited states of sym-triazines, namely, 1,3,5-triazine (1) and the ubiquitous herbicides atrazine [6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine (2)] and ametryn [6-methylthio-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine (3)]. Geometrical structures, energetics, and transition and state properties of I and 2 were computed at the TD-DFT, CASSCF, and CASPT2 levels of theory. The fluorescence and phosphorescence emission spectra, lifetimes, and fluorescence quantum yields were measured for the three compounds, and from these, the energies of the lowest excited states and their corresponding radiative rates…
A call for dissensus in art education!
2019
This article argues for the relevance of the term dissensus by the French philosopher Jacques Rancière in an art educational context in particular and an educational context in general. This argument is based on research referred to in this article, where the author made use of dissensus to analyse how encounters with contemporary art contribute to movements in youngsters’ ways of relating to artworks and the environment that surrounds them, as well as changes in the ways of relating to themselves and others ‐ what here is called events of subjectivation. As dissensus is seen as a premise for subjectivation, the author argues for initiating dissensus by introducing students to both art and …
De Kelsen a la informática jurídica: una entrevista con Mario G. Losano
2018
Desde que su mentor, Norberto Bobbio, le encargara la traducción de la segunda edición de la Teoría pura del derecho (1960), la carrera de Mario G. Losano ha sido tan larga como polifacética. En esta entrevista, conversamos sobre su formación y sobre el contexto cultural que envolvió el inicio de su carrera académica en Italia. Posteriormente, nos centramos en dos de los principales temas de su producción académica. Por un lado, profundizamos en sus estudios kelsenianos, destacando el enfoque histórico que caracteriza su aproximación a los problemas iusfilosóficos. Y, por otro lado, abordamos el asunto de los orígenes y el desarrollo de la informática jurídica, de la cual el profesor Losano…
Promoting children’s participation: the role of teachers in preschool and primary school learning sessions
2010
The aim of this study is to provide insights into the social construction of participation in joint activities in Finnish preschool and primary school classrooms. The article deals with two issues: How do teachers promote participation in a preschool classroom as compared with a primary school classroom? What similarities and differences are found? It also considers the question of how the similarities contribute to the continuity from preschool to primary school in terms of participation. Based on observation data insights are provided into the interactions between teachers and children by using extracts from teacher‐led learning sessions. The teachers used a diversity of strategies to pro…
Tutorial Action in Small Groups: An Educational Experience With University Students
2016
Resumen:En el presente estudio se plantean tres objetivos. El primero, describir las principales características de un programa de acción tutorial desarrollado en una asignatura de una facultad de formación de profesorado. El segundo, determinar la valoración del grado de importancia que el estudiantado otorga a un grupo de competencias transversales y el grado de conocimiento sobre aspectos relacionados con la metodología de investigación durante el proceso de acción tutorial. El tercero, discutir el papel que juega la acción tutorial en la formación universitaria dentro del nuevo espacio europeo de educación superior. La experiencia se desarrolló en el curso académico 2014-2015. Participa…
Evaluating the Effectiveness of Modelling-Oriented Workshops for Engineering Undergraduates in the Field of Thermally Activated Phenomena
2017
Two 20-h modelling-based workshops focused on the explanation of ther- mally activated phenomena were held at the University of Palermo, Italy, during the Academic Year 2014–2015. One of them was conducted by applying an inquiry-based approach, while the other, still based on laboratory and modelling activities, was not focused on inquiry. Seventy-two students belonging to the Undergraduate Program for Chemical Engineering attended the two workshops. The related content was focused on an à la Feynman unifying approach to thermally activated phenomena. Question- naires were administered to the students of both groups, before and post instruction. Responses were analysed using k-means cluster…
Toward adjustment profiles for lower secondary student-athletes in the Finnish dual career context: A mixed-methods approach
2022
Engagement, burnout, and experiences are central concepts for understanding student-athlete adjustment in a dual career (DC) environment. As part of a larger 3-year, lower secondary sports schools pilot project, the aim of this study was to examine student-athletes’ DC adjustment in Finnish lower secondary sports schools at the end of the second academic year. By combining quantitative and qualitative methods, we sought to (a) identify adjustment profiles among student-athletes based on measures of engagement and burnout in school and sport and (b) to extract experiences that describe the distribution of student-athletes in the profiles. A latent profile analysis using questionnaire data fr…
Two New Alternatives to the Conventional Arm-in-Cage Test for Assessing Topical Repellents
2021
Abstract European guidelines for testing attractant and repellent efficacy (i.e., Product type 19 [PT19]) have been in revision since 2017. A key topic of discussion is the current approach to evaluating topical repellents. The European Chemical Agency has stated field testing should be avoided because of mosquito-borne disease risks. However, the most common laboratory method, the arm-in-cage (AIC) test, may limit the reliable extrapolation of lab results to field conditions. This study’s main goal was to assess alternative laboratory methods for evaluating topical mosquito repellents that use mosquito landing rates more representative of those in the field. The study took place at three E…
Energy analysis of a non-linear dynamic impact using FEM
2014
In the car industry, the Finite Element Method (FEM) is being more and more used to analyze the crashworthiness performance of vehicles. In order to validate the results, these impact simulations are normally compared with real crash footage and acceleration data. This paper studies the deformation- and energy output of a simple dummy model during a non-linear dynamic impact. The dummy model is crashed into an obstacle at three different velocities to observe the energy dissipated through different damping mechanisms. Furthermore, in impact simulations, material damping plays an important role in energy dissipation. However, it can be difficult to determine realistic damping parameter value…