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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Using Auditory Modalities to Develop Rhythmic Competency in Children's Fundamental Movement Skills

Severy, Sally Suzanne 01 January 2016 (has links)
Physical education classrooms often have low levels of moderate to vigorous physical activity levels. This is a problem since many young elementary students are not building a foundation of fundamental movement skills necessary to be lifelong participants in physical activities. This study investigated how elementary physical education teachers used auditory modalities in their classrooms. The research question explored the emergence of rhythmic competency in fundamental movement skills to increase overall moderate to vigorous activity levels. This concurrent, mixed-methods, multiple case study used a constructivist paradigm using the schema and dynamic system theories as the underlying motor system theoretical framework. Two research sites were selected: a suburban Maryland public school system and a private liberal arts college located in the same county. The participants included 21 elementary physical education teachers and 6 physical education or exercise science majors from nationally recognized programs. Data were collected from a focus group, interviews, classroom observations, and a 10-item response Likert style survey designed for elementary physical education teachers to recognize current trends in the field of auditory modalities and rhythmic competency. The data were analyzed to identify auditory modality instructional methods for the emergence of rhythmic competencies. The results consisted of a list of best practices for use such as musical rhythms, verbal cues, and sound cues by physical education teachers and specialists. This research promotes positive social change by providing information for successfully planning interventions in the discipline of motor skill and rhythmic development that can lead to overall increased more-vigorous physical activity.
2

Dinamica não-linear de objetos no espaço, excitados pelo potencial de gravidade / Nonlinear dynamic of objects in space excited by the gravity potential

Bolla, Maira Rosine 28 July 2005 (has links)
Orientadores: Jose Manoel Balthazar, Helder Anibal Hermini / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-05T09:56:56Z (GMT). No. of bitstreams: 1 Bolla_MairaRosine_M.pdf: 1168474 bytes, checksum: 0fac8753156d18f561b1aeef6a8a6210 (MD5) Previous issue date: 2005 / Resumo: Este trabalho consiste de duas partes, na primeira faremos o estudo da dinâmica de uma espaçonave de dupla rotação axial, modelada por um sistema mecânico simples, constituído de um rotor desbalanceado atachado num suporte elástico e governado por uma fonte de energia não-ideal. Na segunda parte formularemos todas as equações diferenciais não-lineares que governam os movimentos não-lineares de uma viga com movimentos de curvatura e arfagem no espaço. A formulação é baseada num princípio variacional que leva em conta todas as não linearidades devido à deformação e efeitos de gradiente de gravidade. As não-linearidades devidas às deformações aparecem devido aos efeitos geométricos, que consiste dos termos não-lineares de curvatura e inércia. Equações expandidas que governam os movimentos perturbados não-lineares ao redor de um equilíbrio são também desenvolvidas para o caso em que a viga está em órbita circular. Tais equações são adaptadas para uma análise de perturbação do movimento, e não-linearidades até ordem cúbica são representadas por um parâmetro. Também é analisado o acoplamento não-linear da resposta de arfagem-curvatura de uma viga livre-livre em uma órbita circular, quando a viga está sujeita a uma excitação externa periódica. As não-linearidades presentes nas equações diferenciais do movimento são devidas às deformações da viga (isto é, não-lineridades de curvatura e de inércia) e também devido ao momento de gradiente de gravidade. Métodos de perturbações são usados para analisar o movimento. Vários movimentos de ressonância exibidos pelo sistema são analisados em detalhe, nomeados, ressonâncias harmônicas quando a freqüência de excitação externa, O, está próxima da freqüência natural de flexão ou do movimento de arfagem, e a ressonância super-harmônica quando O está próxima da metade da freqüência natural do movimento de arfagem. As últimas duas ressonâncias estão associadas com excitações de baixa freqüência / Abstract: This work concerns of two parts, in the first we will make the study of the dynamics of dual-spin-spacecraft modeled by a simple mechanical system consisting of an unbalanced rotor attached to an elastic support and driven by non-ideal source. In the second part we will formulate the complete nonlinear differential equations governing the nonlinear motions of a beam able to undergo bending and pitching in space. The formulation is based on a variational principle and accounts for all the nonlinearities due to deformation and gravity gradient effects. The nonlinearities due to deformation arise due to geometric effects, which consist of nonlinear curvature and nonlinear inertia terms. Expanded equations governing the nonlinear perturbed motions about an equilibrium are also developed for the case when the beam is in circular orbit. Such equations are suited for a perturbation analysis of the motion, and nonlinearities up to cubic order in a bookkeeping parameter are retained in them. The coupled nonlinear pitch-bending response of a free-free beam in a circular orbit, when the beam is subjected to a periodic external excitation, is analysed too. The nonlinearities present in the differential equations of motion are due to deformations of the beam (i. e. curvature and inertia nonlinearities) and to the gravity-gradient moments. Perturbation methods are used to analyse the motion. Several resonant motions exhibited by the system are analysed in detail, namely, harmonic resonances when the frequency of the external excitations, O, is either near the natural frequency of the flexural or of the pitch motion, and a superharmonic resonance when O is near one half of the natural frequency for the pitch motion. The latter two resonances are associated with very low excitation frequencies / Mestrado / Mecanica dos Sólidos e Projeto Mecanico / Mestre em Engenharia Mecânica

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