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A partir de balanços feitos nos anos 1990 sobre os fundamentos teóricos dos estudos migratórios, propomos aqui uma análise e uma crítica de um destes troncos. Com esse artigo ressaltamos as contribuições decisivas da perspectiva teórica da mobilidade do trabalho no questionamento dos limites da separação entre as determinações estruturais reivindicadas pela leitura identificada no contexto do agrupamento dos estudos migratórios em troncos teóricos como enfoque histórico-estrutural e a vontade subjetiva reivindicada pelo enfoque neoclássico, além do papel desempenhado pelos discursos sobre a migração e pelos mecanismos que eles acionam enquanto formas de controle do espaço, do trabalho e do trabalhador. Procuramos avançar, todavia, propondo uma leitura crítica dessa própria perspectiva de modo a evidenciar seus limites na conceituação ontológica do trabalho em que se baseia. A partir daí e da historicidade que a categoria de trabalho ganha nessa interpretação crítica, refletimos sobre as condições hodiernas críticas para a sua mobilização e sobre a posição de administração estatal da crise do trabalho que assume o antigo planejamento juntamente com a produção científica que o fundamenta, tornando essencial a crítica da mobilidade inclusive dos sujeitos que produzem os estudos migratórios. A partir de revisiones en los años 1990 acerca de fundamentos teóricos de los estudios migratorios, proponemos aquí un análisis y una crítica de uno de esos troncos. Con este artículo resaltamos los aportes decisivos de la perspectiva teórica de la movilidad del trabajo para el cuestionamiento de los límites de la separación entre las determinaciones estructurales reclamadas por la lectura identificada como enfoque histórico-estructural y la voluntad subjetiva reclamada por el enfoque neoclásico, además del papel desempeñado por los discursos sobre la migración y por los mecanismos que ellos accionan en cuanto formas de control del espacio, del trabajo y del trabajador. Buscamos avanzar todavía proponiendo una lectura crítica de esta propia perspectiva de modo a evidenciar sus límites en la concepción ontológica del trabajo en que se embasa. Desde ahí y de la historicidad que gana la categoría del trabajo en esta interpretación crítica pensamos acerca de las condiciones hodiernas críticas para su movilización y sobre la posición de administración estatal de la crisis del trabajo que asume el planeamiento juntamente con la producción científica que le embasa, tornando esencial la crítica de la movilidad incluso de los sujetos que producen estudios migratorios. From 1990s reviews of theoretical perspectives on migratory studies we here propose an analysis and a critique of one of them. With this paper, we highlight the decisive contributions of the theory of the labor mobility enabling to question the separation between the structural determinations claimed by the so-called historical-structural approach and the subjective will claimed by the neoclassic approach, besides the role performed by the discourses over migration and the mechanisms played by them as forms of controlling the space, the labor and the worker. However, we aim at moving the controversy further by proposing a critical reading of this very perspective in order to reveal its limits concerning the ontological conceptualization of labor in which its stands. Finally, we reflect upon the contemporary critical conditions of labor mobility and upon the position of crisis administration undertaken by the State planning together with the scientific production that supports it, what makes essential the critique even of those subjects who produce migratory studies.

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Nucleation and healing of structural defects in single-walled carbon nanotubes (SWCNTs) studied through reactive molecular dynamics simulations (RMD) and RMD trajectories reveal formation and healing mechanisms of various topological defects on the catalyst surface. A quality percentage of nanotubes is measured by calculating the amount of hexagons per carbon atom relative to the same quantity for a perfect nanotube of the same length. Following this approach, the concentration of defects is estimated for nanotubes grown on catalysts with different sizes and morphologies and for various temperatures and gas-phase densities. From this analysis, we identify specific catalyst morphologies that favor the growth of SWCNTs with low defect concentration. Vacancies, 5–7, and Stone–Wales defects are observed to nucleate distinctly in the tubes depending on the catalyst morphology. We find that a strong interaction between the catalyst surface and the graphitic lattice of the nanotube is absolutely necessary for he...

Single-walled carbon nanotubes are usually synthesized by catalytic growth driven by reaction of a precursor gas over metallic nanoparticles supported on a substrate. Here we use molecular dynamics simulations (MD) with the purpose of determining how the catalyst−substrate strength of adhesion influences the structure of the carbon networks synthesized on the catalyst surface. It is found that the strength of the catalyst/substrate interaction energies defines the shape of the catalyst particle. When these energies are attractive, the nanocatalyst height decreases due to enhanced wetting and in turn favors the lifting up of carbon nanotube caps during the synthesis process. In addition, the presence of an appropriate substrate may avoid catalyst poisoning. This effect may result from repulsion forces from the substrate toward catalyzed carbon atoms, which cause carbon atoms to diffuse to upper layers, thus keeping the catalyst−substrate interface exposed to continuous catalytic activity. However, too stro...