Top Down Control
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Controlled synthesis of noble metal nanomaterials: motivation, principles, and opportunities in nanocatalysis
ABSTRACT This review describes some principles of the controlled synthesis of metal nanoparticles, focusing on how the fundamental understanding of their synthesis in the solution-phase can be put to tailor size, shape, composition, and architecture. The maneuvering over these parameters not only enable the tuning of properties, but also the maximization and
An. Acad. Bras. Ciênc.. Publicado em: 16/04/2018
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2. Voluntary and automatic orienting of attention during childhood development
Selective attention directs cognitive resources to relevant objects or events through either voluntary (top-down) or automatic (bottom-up) control. This paper analyzes voluntary and automatic orienting of attention during childhood development. Seventy-four children (6 to 10 years old) were asked to press a key in response to a visual target presented in a p
Psychol. Neurosci.. Publicado em: 2013-06
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3. Reguladores da variação temporal e espacial da comunidade bacteriana em lagoa rasa subtropical
O bacterioplâncton é um dos grupos de organismos responsáveis pela remineralização de nutrientes em ecossistemas aquáticos, bem como produtor de biomassa através da alça microbiana. Compreender a dinâmica dessa comunidade em função da variação térmica, disponibilidade de recursos e pressão de predação pode fornecer elementos que auxiliem no
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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4. Aplicação da estratigrafia de sequências para caracterização em multiescala de reservatórios no Grupo Guatá (Eopermiano da Bacia do Paraná) na Região São Gabriel-RS, Brasil
Detailed stratigraphic analysis of the Early Permian Rio Bonito and Palermo Formations of the intracratonic Paraná Basin in the region of São Gabriel County has been used for a study on reservoir characterization of paralic sandstones. Two main depositional systems were recognized, a fluvial-dominated delta system at the base and a wavedominated barrier is
Publicado em: 2010
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5. Representação de conhecimento : programação em lógica e o modelo das hiperredes / Knowledge representation: logic programming and the hypernets model
Apesar de sua inerente indecidibilidade e do problema da negação, extensões da lógica de primeira ordem tem se mostrado capazes de superar a questão da monotonicidade, vindo a constituir esquemas de representação de conhecimento de expressividade virtualmente universal. Resta entretanto solucionar ou pelo menos amenizar as conseqüências do problema
Publicado em: 2010
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6. Nanoparticles of metal and metal oxides: some peculiar synthesis methods, size and shape control, application to catalysts preparation
One step (direct) and multisteps synthesis methods of metal and oxide nanoparticles are presented including both bottom-up and top-down procedures. Chemical methods involving the polyol process allows to get either isotropic or anisotropic nanoparticles. Nanowires, nanorods and dumbells can be generated either by heterogeneous nucleation or by using a templa
Brazilian Journal of Physics. Publicado em: 2009-04
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7. Toxicidade subcrônica de lambaris Astyanax aff. bimaculatus expostos ao zinco / Subchronic toxicity in Astyanax aff. bimaculatus exposed to zinc.
Many metals occur naturally in aquatic environments and are classified as pollutants only when added by men in sufficient amounts to produce deleterious effects on organisms. Among these metals already existent on the aquatic environment it can be mentioned zinc (Zn) which is an essential element for living beings. In high concentrations, zinc can become tox
Publicado em: 2009
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8. Padronização da expressão heterologa e de modelo de ensaio de atividade para a proteina quinase humana S6K / Standardization of the heterologous expression and of a model assay of activity for the human protein kinase S6K
The 70kDa ribosomal S6 protein kinase 1 (S6K1) is a phosphoprotein involved in the regulation of genes related to translational control in mammals. S6K1 shows distinct nuclear (a1) and cytoplasmic (a2) forms. Phosphorylation of the S6K1 best characterized target, the protein of the small ribosomal subunit (RPS6), has been generally associated to the selectiv
Publicado em: 2009
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9. The influency of screen height of computer in ocurrence of neck pain / A influencia da altura da tela do computador na ocorrencia da dor cervical
Considering both national and international researched literature, one can notice several disagreements about the most appropriate height of the computer screen in relation to operator eyes level, being here the target to provide better working conditions to the user. Some authors, associations and organizations suggest that the top of the computer screen sh
Publicado em: 2008
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10. Species assembly rules and the biodiversity-ecosystem functioning relationship / Regras entre assemblÃias de espÃcies: relaÃÃo entre biodiversidade e funcionamento do ecossistema
The biological diversity of ecosystems has important implications for their functioning. However, in order for reliable predictions to be made on the effects of species extinctions and/or additions on particular ecosystem functions, accurate knowledge is required on the ways in which species interact. These interactions in turn are important drivers of commu
Publicado em: 2007
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11. AnÃlise morfodinÃmica na Reserva EcolÃgica de CamaÃari, Cabo de Santo Agostinho - PE
The present work was developed within the environmental impacts perspective, focusing on the continuing process of metropolitan sprawling, and aimed at identifying and analyzing erosive processes found within an officially designated permanent environment protection area. Inside CamaÃari Ecological Reservation, municipality of Cabo de Santo Agostinho, Recif
Publicado em: 2007
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12. Modelagem endoscÃpica virtual do monitoramento de equipamentos elÃtricos de alta tensÃo
With the promulgation of the 10.847/2004 and 10.848/2004 Laws, the Brazilian Power Sector started adopting competitiveness as the main element for obtaining concessions in the electric power system transmission and generation sectors. In this sense, the power sector companies will have to strongly intensify the monitoring processes of the power system equipm
Publicado em: 2007