Relevant bibliographies by topics / Repulsores

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Repulsores'

Author: Grafiati
Published: 8 September 2021
Last updated: 18 February 2022

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Journal articles on the topic "Repulsores"

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Gibbons, G., and H. Kodama. "Repulsons in the Myers-Perry Family." Progress of Theoretical Physics 121, no. 6 (June 1, 2009): 1361–79. http://dx.doi.org/10.1143/ptp.121.1361.

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Lobo, Carlos, Ralfo Matos, and José Marcos P. da Cunha. "Mineiros retornados e a corrente de migrantes paulistas." Revista da Universidade Federal de Minas Gerais 25, no. 1 e 2 (December 31, 2018): 178–97. http://dx.doi.org/10.35699/2316-770x.2018.19533.

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Minas Gerais se caracterizou historicamente como área repulsora de população, cujas trocas expressavam saldos amplamente favoráveis a São Paulo. Entretanto, mudanças recentes na dinâmica migratória podem ser observadas desde 1991, quando havia sinais de declínio da emigração para São Paulo. Os dados do último Censo confirmaram um novo cenário: de crescente contingente migratório procedente de São Paulo. A expansão da área de influência de São Paulo sugere a consolidação de novos centros regionais em Minas Gerais, que absorvem os efeitos da desconcentração econômica paulista. As evidências dessa dispersão ampliada podem ser observadas no crescimento da migração para microrregiões do Sul de Minas, Triângulo e Mata, que se destacam na atração de migrantes (mineiros ou paulistas).
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Silva, G. T., J. H. Lopes, and F. G. Mitri. "Off-axial acoustic radiation force of repulsor and tractor bessel beams on a sphere." IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 60, no. 6 (June 2013): 1207–12. http://dx.doi.org/10.1109/tuffc.2013.2683.

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Santos, Antonio Marques dos, and Erikson Alves de Sousa. "Tratamento experimental do protótipo de um motor de corrente contínua." Research, Society and Development 9, no. 4 (March 20, 2020): e91942848. http://dx.doi.org/10.33448/rsd-v9i4.2848.

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Esse trabalho tem como objetivo apresentar os resultados do estudo analítico e experimental do protótipo de um motor de corrente contínua desenvolvido experimentalmente. Esse motor tem como princípio da ação motora, as forças repulsoras entre ímãs ou eletroímãs. Teve como base fundamental para análise das forças, campo e torque atuante no rotor as leis da magnetostática, tais como a Lei de Ampére e a Lei de Biot Savart, além de conceitos relacionados ao princípio de funcionamento de um motor de corrente contínua. Para modelagem do experimento utilizou-se o software SketchUp, uma ferramenta que permite a construção de modelos geométricos, modelos físicos e por fim, um protótipo, permitindo dar um posicionamento estratégico as bobinas, rotor e estator, tendo como objetivo principal da modelagem, apresentar um experimento com características de um motor elétrico e que sua estrutura apresente semelhança com as exemplificações feitas em livros didáticos. Na construção do protótipo foi utilizado elementos de baixo custo, aproveitando componentes de equipamentos descartados. Os resultados obtidos através dos estudos analíticos e testes experimentais permite visualizar um adequado funcionamento do protótipo, possibilitando sem muitas complicações visualizar diversos tópicos abordados no curso de física e engenharia, tais como, campos magnéticos gerado por bobinas, força magnética, torque em uma espira, força magnética em um fio percorrido por corrente, velocidade de um rotor composto por bobinas imerso em um campo magnético e momento dipolar, além de sua estrutura permitir chegar a resultados matemáticos acerca de seu funcionamento, usando princípios básicos do eletromagnetismo..
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Miranda, Francisco Otávio, Leonardo Deane de Abreu Sá, Celso Von Radow, Fernando M. Ramos, and Antônio O. Manzi. "Picos na velocidade do vento e sua relação com aumentos em fluxos de escalares na atmosfera tropical noturna: Estudo de caso." Ciência e Natura 42 (August 28, 2020): e12. http://dx.doi.org/10.5902/2179460x45354.

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Some physical aspects related to the occurrence of nocturnal instability-inducing intense peaks in wind speed (here abbreviated by PV.) in the tropical atmosphere above forest were investigated. Such phenomena cause strong variations in turbulent signals, occurrence of strong turbulence regimes, and significant increases in scalar fluxes. Was found that these events that occur during strong turbulence regimes can be preceded and succeeded by low frequency oscillations in environmental variables and that the significant increase in scalar fluxes observed is associated with the existence of a relative maximum wind speed value (). Procedures are applied to the data used here to enable the construction of phase space diagrams in order to better analyze the increase in amplitude of low frequency oscillations observed before PV outbreak, as well as the decrease in amplitude after PV. The aforementioned phase diagrams are used to obtain repulsor and attractor limit cycles, which respectively precede and succeed the peaks in wind speed. Weather radar images are also used to further investigate the studied atmospheric phenomenon.
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Ou, Chang-Jin, Bao-Yi Ren, Jie-Wei Li, Dong-Qing Lin, Chao Zhong, Ling-Hai Xie, Jian-Feng Zhao, Bao-Xiu Mi, Hong-Tao Cao, and Wei Huang. "Excimer-based white electroluminescence from supramolecular bulk effects of dumbbell-shaped molecules via attractor-repulsor molecular design." Organic Electronics 43 (April 2017): 87–95. http://dx.doi.org/10.1016/j.orgel.2016.12.029.

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Zhang, He, Dong-Qing Lin, Bo Li, Hui-Fang Liu, Sha-Sha Wang, Yong-Xia Wang, Ming-Li Sun, et al. "Organic Micro-/Nanocrystals of SFX-Based Attractor–Repulsor Molecules with the Feature of Crystal-Induced Luminescence Enhancement." Journal of Physical Chemistry C 125, no. 11 (March 5, 2021): 6249–59. http://dx.doi.org/10.1021/acs.jpcc.0c09702.

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Medina Guevara, María Guadalupe, Héctor Vargas Rodríguez, Pedro Basilio Espinoza Padilla, and José Luis Gozález Solís. "Evolution of Electoral Preferences for a Regime of Three Political Parties." Discrete Dynamics in Nature and Society 2018 (October 24, 2018): 1–9. http://dx.doi.org/10.1155/2018/2989851.

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In this article, we use a discrete system to study the opinion dynamics regarding the electoral preferences of a nontendentious group of agents. To measure the level of preference, a continuous opinion space is used, in which the preference (opinion) can evolve from any political option, to any other; for a regime of three parties, a circle is the convenient space. To model a nonbiased society, new agents are considered. Besides their opinion, they have a new attribute: an individual iterative monoparametric map that imitates a process of internal reflection, allowing them to update their opinion in their own way. These iterative maps introduce six fixed points on the opinion space; the points’ stability depends on the sign of the parameter. When the latter is positive, three attractors are identified with political options, while the repulsors are identified with the antioptions (preferences diametrically opposed to each political choice). In this new model, pairs of agents interact only if their respective opinions are alike; a positive number called confidence bound is introduced with this purpose; if opinions are similar, they update their opinion considering each other’s opinion, while if they are not alike, each agent updates her opinion considering only her individual map. In addition, agents give a certain level of trust (weight) to other agent’s opinions; this results in a positive stochastic matrix of weights which models the social network. The model can be reduced to a pair of coupled nonlinear difference equations, making extracting analytical results possible: a theorem on the conditions governing the existence of consensus in this new artificial society. Some numerical simulations are provided, exemplifying the analytical results.
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Santiago, Jessica, Sebastian Schuster, and Matt Visser. "Tractor Beams, Pressor Beams and Stressor Beams in General Relativity." Universe 7, no. 8 (July 27, 2021): 271. http://dx.doi.org/10.3390/universe7080271.

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The metrics of general relativity generally fall into two categories: those which are solutions of the Einstein equations for a given source energy-momentum tensor and the “reverse engineered” metrics—metrics bespoke for a certain purpose. Their energy-momentum tensors are then calculated by inserting these into the Einstein equations. This latter approach has found frequent use when confronted with creative input from fiction, wormholes and warp drives being the most famous examples. In this paper, we again take inspiration from fiction and see what general relativity can tell us about the possibility of a gravitationally induced tractor beam. We base our construction on warp drives and show how versatile this ansatz alone proves to be. Not only can we easily find tractor beams (attracting objects), but repulsor/pressor beams are just as attainable, and a generalization to “stressor” beams is seen to present itself quite naturally. We show that all of these metrics would violate various energy conditions. This provides an opportunity to ruminate on the meaning of energy conditions as such and what we can learn about whether an arbitrarily advanced civilization might have access to such beams.
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Algaba, Antonio, Fernando Fernández-Sánchez, Manuel Merino, and Alejandro J. Rodríguez-Luis. "Chen's attractor exists if Lorenz repulsor exists: The Chen system is a special case of the Lorenz system." Chaos: An Interdisciplinary Journal of Nonlinear Science 23, no. 3 (September 2013): 033108. http://dx.doi.org/10.1063/1.4813227.

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Dissertations / Theses on the topic "Repulsores"

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Rayzaro, Oyran Silva [UNESP]. "Estimativas inferiores para dimensão de Hausdorff de repulsores não-uniformemente expansores." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/110599.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Estudamos a dimensão de Hausdorff de certos conjuntos invariantes obtidos como repulsores de aplicações com buraco. Neste trabalho relacionamos a dimensão de Hausdorff do repulsor ¤ com o volume do buraco H, em particular mostramos que a dimensão de Hausdorff de ¤ pode ser tomada arbitrariamente próxima da dimensão do ambiente desde que o volume de H seja suficientemente pequeno. Como aplicação dos resultados, mostramos que a dimensão de Hausdorff dos repulsores de uma família desdobrando uma bifurcaçãoo de Hopf varia continuamente no parâmetro de bifurcação
We study the Hausdorff dimension of certain invariant sets obtained as repeller of maps with hole. In this work we relate the Hausdorff dimension of the repeller ¤ with the volume of the hole H, in particular one show that the Hausdorff, dimension of ¤ can be made arbitrarily close to the dimension of ambient provided that the volume of H is suficiently small. As an application, we show that the Hausdorff dimension of repellers of the a family unfolding a Hof bifurcation varies continuously at the bifurcation parameter
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Rayzaro, Oyran Silva. "Estimativas inferiores para dimensão de Hausdorff de repulsores não-uniformemente expansores /." São José do Rio Preto, 2014. http://hdl.handle.net/11449/110599.

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Orientador: Vanderlei Minori Horita
Banca: Ali Messaoudi
Banca: Marcio Ricardo Alves Gouveia
Banca: Thiago Aparecido Catalan
Banca: Nivaldo Costa Muniz
Resumo: Estudamos a dimensão de Hausdorff de certos conjuntos invariantes obtidos como repulsores de aplicações com buraco. Neste trabalho relacionamos a dimensão de Hausdorff do repulsor ¤ com o volume do buraco H, em particular mostramos que a dimensão de Hausdorff de ¤ pode ser tomada arbitrariamente próxima da dimensão do ambiente desde que o volume de H seja suficientemente pequeno. Como aplicação dos resultados, mostramos que a dimensão de Hausdorff dos repulsores de uma família desdobrando uma bifurcaçãoo de Hopf varia continuamente no parâmetro de bifurcação
Abstract: We study the Hausdorff dimension of certain invariant sets obtained as repeller of maps with hole. In this work we relate the Hausdorff dimension of the repeller ¤ with the volume of the hole H, in particular one show that the Hausdorff, dimension of ¤ can be made arbitrarily close to the dimension of ambient provided that the volume of H is suficiently small. As an application, we show that the Hausdorff dimension of repellers of the a family unfolding a Hof bifurcation varies continuously at the bifurcation parameter
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Carvalheira, Manuel Pereira. "Controlo de um veículo aéreo semi-autónomo." Master's thesis, 2006. http://hdl.handle.net/1822/6939.

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Este trabalho tem como objectivo a aplicação da abordagem baseada em atractores de sistemas dinâmicos, usada para o controlo do movimento de um veículo aéreo aerostático semi-autónomo. Foi projectada uma arquitectura de controlo formalizada como um sistema dinâmico não linear. Esta foi inicialmente validada através de simulações computacionais. Numa primeira fase usámos um simulador construído no programa MATLAB e a ferramenta SIMULINK desse programa. Numa fase posterior a simulação foi feita em linguagem C++ e a ferramenta gráfica OpenGL. Desta forma o cálculo do modelo do dirigível passou a ser realizado com recurso ao algoritmo de resolução de equações diferenciais por métodos numéricos, sendo usado o método de quarta ordem de Runge-Kuta. Finalmente fizemos a implementação física da arquitectura de controlo no dirigível adquirido, tendo para isso sido construído um interface entre o computador e o comando dos motores. A informação sensorial provém de uma câmara de vídeo CMOS instalada na gôndola do dirigível. O processamento de imagem dá-nos a direcção, a distância e a diferença de altitude à qual os obstáculos e os alvos estão localizados em relação à direcção frontal do dirigível. Esta informação é usada para gerar a dinâmica comportamental que será a responsável pela actuação dos motores.
The goal of this work is the application of the approach based on attractors dynamics to the motion control of a semi-autonomous aerostatic air vehicle. The designed control architecture is fully formalized as a non-linear dynamical system. This was first validated through computational simulations. In order to do so, a simulator built with Matlab Simulink was used. In a latter stage a new simulator was built using C + + and OpenGL. In the second simulator, the Simulink space state model of the airship was replaced by differential equations solved with a fourth order Runge-Kuta method. The last step was the physical implementation of the control architecture on a real airship. To made this possible, an interface was designed and built so we could communicate with the airship thrusters using the computer. Sensory information comes from a CMOS camera in the airship gondola. Image processing gives us direction, distance and the altitude diference at which targets and obstacles lie relatively to the airship’s frontal direction. This information is then used to generate the behavioral dynamics which will be responsible for the actuation of the thrusters.
Fundação para a Ciência e a Tecnologia (FCT) - projecto POSI/SRI/38051/2001
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Canelhas, Jorge Miguel Silvestre. "Analysis of the use of repulsors to improve generalization ability in genetic programming : an application to symbolic regression problems." Master's thesis, 2018. http://hdl.handle.net/10362/28931.

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Dissertation presented as the partial requirement for obtaining a Master's degree in Information Management, specialization in Information Systems and Technologies Management
Genetic Algorithms are bio-inspired metaheuristics that solve optimization problems; they are evolutionary algorithms that mimic the biological processes of evolution and natural selection to evolve solutions to a given problem. Genetic programming consists of the creation of programs employing GAs to evolve them. In both GA and GP, the algorithm starts with a random solution to a problem that is improved generation after generation building it on the positive traits of the previous generation and discarding traits that do not improve the solution. Repulsors consist of giving the learning algorithm some prior knowledge on the outcome of previous generations on a test set, to try to replace solutions that performed poorly on the data set with better ones. This thesis aims to test and document if the use of repulsors can change the behavior of GP, improve its learning rate and reduce overfitting thus also improving the generalization abilities? Overfitting is a problem in many machine learning algorithms, genetic programming (GP) is also affected by it, one of the objectives of this dissertation is to assess if overfitting can be reduced by using knowledge on the prior behavior of programs generated by GP on a validation data set, and, applying this knowledge to change the selection phase penalizing solutions similar to those that generalized poorly before. These poorly performing solutions will be called repulsors and are the main topic of this dissertation. We developed a program that implemented standard and repulsor based genetic programming. The program was then executed several times over some datasets and collect the results. Finally, the results were compared, and conclusions were taken. The results indicate that the use of repulsors produces better results on the training set and in the test set, this leads us to conclude that the use of repulsors has a positive effect on the performance of GP. The results indicate that the use of repulsors does indeed produce better results. On the training phase, seven out of the nine datasets showed improved algorithm performance when learning. In the test sets, the algorithm presented better generalization ability on five out of nine datasets. Studies could be extended to the use of multi-objective optimization when selecting individuals, and the extension of the repulsor list to other (independent) runs with the same parameters and dataset.
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Conference papers on the topic "Repulsores"

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Spitz, Jonathan, Karim Bouyarmane, Serena Ivaldi, and Jean-Baptiste Mouret. "Trial-and-error learning of repulsors for humanoid QP-based whole-body control." In 2017 IEEE-RAS 17th International Conference on Humanoid Robotics (Humanoids). IEEE, 2017. http://dx.doi.org/10.1109/humanoids.2017.8246914.

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