Search results for " Modeling"

Global aerosol modeling with MADE3 (v3.0) in EMAC (based on v2.53): model description and evaluation

2019

Recently, the aerosol microphysics submodel MADE3 (Modal Aerosol Dynamics model for Europe, adapted for global applications, third generation) was introduced as a successor to MADE and MADE-in. It includes nine aerosol species and nine lognormal modes to represent aerosol particles of three different mixing states throughout the aerosol size spectrum. Here, we describe the implementation of the most recent version of MADE3 into the ECHAM/MESSy Atmospheric Chemistry (EMAC) general circulation model, including a detailed evaluation of a 10-year aerosol simulation with MADE3 as part of EMAC. We compare simulation output to station network measurements of near-surface aerosol component mass con…

Contextual Method Integration

2007

Influencia del clima motivacional en clase sobre el compromiso escolar de los adolescentes y su logro académico

2017

The scientific literature provides empirical evidence on the relationship between school engagement and numerous important variables of the adolescents’ educational context. The school engagement has been related, among other important constructs, with burnout of both teachers and students, school performance, satisfaction with the school, behavioral disruption, goal orientation and motivational climate in the classroom. Because of it, the aim of this study was to analyze the relationship between perceived motivational class climate and students’ academic achievement, with school engagement acting as a mediator. A sample of 2028 teenagers completed various instruments to measure the percept…

Influence of the motivational climate in physical education on the intention to practice physical activity or sport

2001

This study is based on the achievement goal theory and intended to verify the effects of the motivational climate of the physical education (PE) on students' motivation, interest, and intention to practice physical activity or sport. In order to meet these objectives, 975 participants, from 13 to 18 years of age, completed the following instruments: PECCS, TEOSQ, IMI, Satisfaction Scale, and the Intention to Practice Physical Activity or Sport. The data were analyzed by means of Structural Equation Modeling (SEM). The results confirmed that the mastery dimension of motivational climate has an influence, directly or indirectly, on task orientation, the three dimensions of intrinsic motivatio…

Motivational climate, goal orientation, perceived sport ability, and enjoyment within Finnish junior ice hockey players

2015

The aim of this study was to investigate the relations among situational motivational climate, dispositional approach and avoidance achievement goals, perceived sport ability, and enjoyment in Finnish male junior ice hockey players. The sample comprised 265 junior B-level male players with a mean age of 17.03 years (SD = 0.63). Players filled questionnaires tapping their perceptions of coach motivational climate, achievement goals, perceived sport ability, and enjoyment. For the statistical analysis, players were divided into high and low perceived sport ability groups. Multigroup structural equation modeling (SEM) revealed an indirect path from task-involving motivational climate via task-…

Validez factorial del “cuestionario para la evaluación del síndrome de quemarse por el Trabajo” (CESQT) en una muestra de médicos mexicanos

2010

El objetivo del este estudio fue evaluar la validez factorial y la consistencia interna del “Cuestionario para la Evaluación del Síndrome de Quemarse por el Trabajo” (CESQT). Se hipotetizó un modelo de cuatro factores, similar al del oringinal. La muestra fueron estuvo formada por 1110 médicos del Instituto Mexicano del Seguro Social. El instrumento está formado por 20 items distribuidos en 4 subescalas: Ilusión por el trabajo (5 items), Desgaste psíquico (4 items), Indolencia (6 items), y Culpa (5 items). El modelo fue evaluado con LISREL 8. Según diferentes índices de ajuste global el modelo presentó un ajuste adecuado: Chi2(164) = 225.06 (p < 0.001), GFI = 0.83, RMSEA = 0.061, NNFI = …

Managing Sustainable Performance and Governance in Higher Education Institutions : A Dynamic Performance Management Approach

2022

This book aims to cover about a decade of research activities devoted to university management, exploring its specific organizational complexity, and adopting systemic approaches to managing its performance generation mechanisms. It also draws on the field experience spent as the academic delegate for scientific support to strategic planning, management control, performance evaluation, and statistical reporting at the University of Palermo, Italy. This work is included in a series on “System Dynamics for Performance Management.” The fast-changing evolutionary process of global higher education systems systematically poses new challenges related to the appearance of innovative elements that …

Simulation models in eGovernment using system dynamics: A literature survey

2016

System Dynamics (SD) is a method to build simulation models using computers, to study the behaviour of systems, and apply what-if scenarios aiming at achieving optimal policy design. To have an overview of the current state-of-the-art of SD use in the eGovernment field; we have surveyed related literature. Our main goal is to uncover the possibilities for future research by clarifying the shortages. The identified literature is not very large. In most of the literature, SD models use was limited to SD practitioners. We discovered low usage of Group Model Building and workshops despite their usefulness in involving non-SD practitioners in the model building process. Additionally, there is a …

Single and competitive adsorption of Cd and Zn onto a granular activated carbon

1996

Single and competitive adsorption of cadmium and zinc onto granular activated carbon DARCO 12–20 mesh has been investigated. This activated carbon has been shown as an effective adsorbent for both metals. Cadmium and zinc removals increased with pH and decreased with molar metal/carbon ratio. Surface precipitation phenomena have been detected for the higher pHs and molar ratios. The adsorption process has been modelled on the surface complexation Triple Layer Model (TLM). For this purpose, the amphoteric nature of the activated carbon has been studied. Single metal adsorption data have been used to calibrate TLM parameters. A dependence of the adsorption constants on pH and molar metal/carb…

Transformation of UML models to CSP : a case study for graph transformation tools

2008

Graph transformation provides an intuitive mechanism for capturing model transformations. In the current paper, we investigate and compare various graph transformation tools using a compact practical model transformation case study carried out as part of the AGTIVE 2007 Tool Contest [22]. The aim of this case study is to generate formal CSP processes from high-level UML activity diagrams, which enables to carry out mathematical analysis of the system under design.