Bottom Up Control
Mostrando 1-12 de 25 artigos, teses e dissertações.
-
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
-
2. METODOLOGIAS DE SÍNTESE EM FASE LÍQUIDA PARA A OBTENÇÃO DE NANOMATERIAIS INORGÂNICOS À BASE DE TERRAS RARAS
Liquid phase synthesis techniques are commonly preferred for the preparation of nanosized inorganic solids due to several advantages over other methodologies, such as low energy consumption, safety, possibility of reactant recovery and, mainly, the homogeneity of the precursors and control of particle sizes and morphologies through bottom-up approaches. I
Quím. Nova. Publicado em: 2015-06
-
3. 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
-
4. 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
-
5. Poluição veicular: Avaliação dos impactos e benefícios ambientais com a renovação da frota veicular leve na cidade de São Paulo / Vehicle pollution: Analysis of the impacts and environmental benefits concerning the replacement of light vehicles in São Paulo City
This study presents an analysis of the levels of vehicles emissions related to the pollution problems in São Paulo City. Using a methodology called bottom-up, this thesis presents a theoretical evaluation on the rates of pollutants coming out the exhaust pipe of the largest light vehicles fleet in Brazil. Issues related to daily city activities such as the
Publicado em: 2010
-
6. Estudo geoquímico e microfaunístico da região circunjacente ao emissário submarino de esgoto das Cigarras, São Sebastião, SP / Geochemistry and microfaunistic study of the area around the submarine outfall of Cigarras, São Sebastião, SP
The influence of submarine outfall of domestic sewage on the benthic foraminifera and sediments quality at Cigarras, São Sebastião, SP, is evaluated in this dissertation. Twenty water and bottom sediment samples were collected around the outfall in September 2006 (ten samples) and 2007 (ten samples). Another two samples were collected in the São Sebastiã
Publicado em: 2010
-
7. 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
-
8. Solidification microstructures and mechanical and corrosion resistances of dilute Pb-Sn alloys / Microestrutura de solidificação e resistencias mecanicas e a corrosão de ligas Pb-Sn diluidas
Lead-acid batteries manufacturers have modified the manufacturing processes and the chemical composition of alloys used in battery grids in order to decrease their weight as well as to reduce the production costs, and to increase the battery life-time cycle and the corrosion-resistance. The morphological microstructures characterized by cellular and dendriti
Publicado em: 2009
-
9. 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
-
10. Modelo para previsão da condição térmica de panelas de aciaria
Temperature control during the whole steelmaking process has a great importance to achieve the quality and productivity requirements demanded nowadays.At Gerdau Açominas steelplant, the temperature control of liquid steel from tapping up to the solidification in the caster has been widely studied. Due to the long casting times, a lack of control of the stee
Publicado em: 2007
-
11. Relações tróficas e limnológicas no reservatório de Itaipu: uma análise do impacto da biomassa pesqueira nas comunidades planctônicas / Trophic and limnological interactions in the Itaipu reservoir: an analysis of the impact of the fishing biomass in the planktonic communities
Many experimental studies contributed for the development of the theory of the lacustrine food web, disclosing the important paper of the fish, for decades ignored by the limnology. These studies, in its majority, had been developed in Europe and North America and the generality of the hypotheses supporting the theory was not tested yet in subtropical and tr
Publicado em: 2006
-
12. Sistema de controle e automação aplicável a secadores em camada fina utilizando-se instrumentos digitais endereçáveis / Automation and control system applicable to thin-layer grain dryer by using digital addressable instruments
Many grain-dryers models with different configurations and applications are encountered worldwide. Among those a thin-layer dryer makes it possible to perform detailed analysis of the drying process. With the results from this analysis results, the drying curves can be modeled and the deep bad grain drying process can be predicted. The thin layer grain dryer
Publicado em: 2006