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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

Vliv asymetrické zátěže na stereotyp běhu / Effect of asymmetric load on the stereotype of running.

Holíková, Dana January 2013 (has links)
Title: Effect of asymmetric load on the stereotype of running. Objectives: The aim of this experimental work is to evaluace the electromyographic activity of selected muscles when running without load and with load on the treadmill, and the co- current assessment of the impact of asymmetric load on the lateral weight distribution. Methods: Six recreational runners underwent the experiment during which we monitored electrical activity of m. deltoideus pars anterior, m. trapezius pars ascendes et descendens, lumbar paraspinal muscles, m. gastrocnemius lateralis and m. tibialis anterior while running without load and with load on the periphery of the upper right extremity. For the experiment a motor treadmill at a constant speed of 10 km/h was used and a 0,5 l PET bottle completely filled with water was applied as the load. Changes of lateral weight distribution were assessed having investigated stance on two scales. The measured values were statistically evaluated. Results: Within the group of all the probands it was proved that there existed an impact on normalized average amplitude of EMG signal at left-oriented m. gastrocnemius lateralis. The hypothesis of the influence of asymmetric load on the lateral weight distribution was not demonstrated. Keywords: endurance running, surface...
2

Aspectos dinâmicos e estruturais em modelos de redes para sistemas complexos / Dynamic end Structural Aspects in Networks Models for Complex Systems

Jácome, Samyr Silva Bezerra January 2009 (has links)
JÁCOME, Samyr Silva Bezerra. Aspectos dinâmicos e estruturais em modelos de redes para sistemas complexos. 2009. 95 f. Tese (Doutorado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2009. / Submitted by Edvander Pires (edvanderpires@gmail.com) on 2015-06-18T18:53:05Z No. of bitstreams: 1 2009_tese_ssbjacome.pdf: 1272180 bytes, checksum: 4aaa7877f516c1dfd5dfe603734e397c (MD5) / Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2015-06-18T19:18:21Z (GMT) No. of bitstreams: 1 2009_tese_ssbjacome.pdf: 1272180 bytes, checksum: 4aaa7877f516c1dfd5dfe603734e397c (MD5) / Made available in DSpace on 2015-06-18T19:18:21Z (GMT). No. of bitstreams: 1 2009_tese_ssbjacome.pdf: 1272180 bytes, checksum: 4aaa7877f516c1dfd5dfe603734e397c (MD5) Previous issue date: 2009 / In this thesis we study systems where some form of disorder or non-homogeneity has a significant role at the complexity of the structural building or of the dynamics regulation of the system. First, we study the dynamics of Boolean networks, where the rules to update the state of the nodes are randomly chosen and control the global behavior of the system. At the critical threshold, and near to it, we propose that the transition to the critical regime can be characterized by the divergence of the relaxation time Tr. Based on simple scaling arguments, we show that the cumulative probability distribution of Tr decays as a power-law , with exponent iqual -1, for the annealed model at the critical region. Then, we study a novel method for network decomposition, which we apply to scale-free networks, that have the broad degree distribution as a fundamental feature. This method consists in a simultaneous and iterative remotion of groups of nodes with degree K until there are no more nodes with this degree in the network. Thus, we define new variables that characterize the process of decomposition and we obtain a set of well define exponents and parameters. From the behavior of these variables we can see, through some mathematical manipulations, that our method is self-consistent, serving as a useful tool for the study of the structural features of the network. At last, we study the backbones of the percolation cluster, where we use a network model with layers arranged in a disorderly way to represent some kind of anisotropy resistance to the percolation. Our numerical results indicate a break at the universality class on the fractal dimension and on the mass distribution of the backbones. / Nesta tese estudaremos sistemas onde alguma forma de desordem ou não-homogeneidade tem um importante papel na complexidade da formação estrutural ou da regulagem dinâmica do sistema. Primeiramente estudaremos a dinâmica das redes Booleanas, onde as regras de atualização escolhidas aleatoriamente controlam o comportamento global do sistema. Na condição crítica e próximo dela, propomos que a transição para o regime crítico pode ser caracterizado pela divergência do tempo de relaxação Tr. Baseados em simples argumentos de escalonamento, mostramos, além de outros resultados, que a probabilidade acumulativa da distribuição de Tr decai como uma lei de potência, com o expoente igual a -1, para o modelo annealed na região crítica. Em seguida estudamos um novo método de decomposição de redes aplicado às redes livres de escalas, onde a ampla distribuição de conectividade é um aspecto fundamental. O método consiste basicamente na retirada simultânea e iterativa de grupos de vértices com um determinado grau K de conectividade até que não haja mais sítios com este mesmo grau de conectividade na rede. Deste modo, definimos algumas variáveis que caractarizam o processo de decomposição e obtemos uma série de expoentes e parâmetros bem definidos. A partir do comportamento destas variáveis pudemos constatar por meio de algumas manipulações matemáticas que nosso método é auto-consistente, servindo como ótima ferramenta para estudo dos aspectos estruturais de uma rede. Por fim, estudamos os backbones, onde utilizamos um modelo de rede em que a desordem está no arranjo aleatório de camadas fáceis e difíceis à percolação. Os resultados numéricos indicam a quebra na classe de universalidade da geometria fractal e da distribuição de tamanhos de massa do backbones e também um comportamento assintótico da dimensão fractal no limite de grandes valores de massa e/ou anisotropia.
3

Nematic Liquid Crystals and Nematic Colloids in Microfluidic Environment / Topological Microfluidics / Liquid Crystal Microfluidics

Sengupta, Anupam 18 December 2012 (has links)
No description available.

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