Planning Of Experiments
Mostrando 13-24 de 106 artigos, teses e dissertações.
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13. Effect of scanner acoustic background noise on strict resting-state fMRI
Functional MRI (fMRI) resting-state experiments are aimed at identifying brain networks that support basal brain function. Although most investigators consider a ‘resting-state’ fMRI experiment with no specific external stimulation, subjects are unavoidably under heavy acoustic noise produced by the equipment. In the present study, we evaluated the influ
Braz J Med Biol Res. Publicado em: 12/04/2013
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14. Desenvolvimento e avaliação de algoritmos para composição dinâmica de web services baseada em QoS / Development and evaluation of algoritms for the QoS-aware web services composition problem
This MSc dissertation addresses the QoS-aware Web services composition (QWSC) problem. The field of e-commerce systems was selected because it comprises an area in wide expansion, both in national and international scenarios. Furthermore, e-commerce systems can benefit from QWSC due to its interoperability and compliance to the requirements of quality of ser
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/06/2012
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15. Proposta de um modelo em programação linear para a solução de problemas de sistemas produtivos job shop com setup dependentes da sequência / Proposal of a linear programming model for solving problem systems job shop production with setup times sequence-dependent
Sequencing problems are very common, they happen every time there is a choice regarding the order in which several tasks can be performed. The business can be an airline, a hotel, a computer manufacturer or a university; these issues are part of their routine. The application of the sequencing techniques allows, for example, reducing the costs and fastening
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2012
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16. Dinâmica temporal de pausas e hesitações na fala semi-espontânea / Time dynamics of pauses and hesitations in semi-spontaneous speech
Premissa: esta pesquisa partiu da premissa de que pausas demarcativas estão relacionadas ao planejamento conceitual e hesitações, à formulação linguística. O planejamento conceitual refere-se a um esquema abstrato do texto falado, composto pelas informações que o falante julga relevantes de acordo com sua meta comunicativa. A formulação linguísti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/02/2012
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17. Stochastic Benders decomposition for the supply chain investment planning problem under demand uncertainty
This paper presents the application of a stochastic Benders decomposition algorithm for the problem of supply chain investment planning under uncertainty applied to the petroleum byproducts supply chain. The uncertainty considered is related with the unknown demand levels for oil products. For this purpose, a model was developed based on two-stage stochastic
Pesqui. Oper.. Publicado em: 04/12/2012
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18. Os primeiros estágios de vida da savelha (Brevoortia pectinata) no estuário da Lagoa dos Patos / Early life stages of Argentine menhaden (Brevoortia pectinata) in the Patos Lagoon estuary
Patterns associated to environmental conditions and to the spatial and temporal distributions of the early stages of Argentine menhaden, B. pectinata, and of its development in the Patos Lagoon estuary were investigated using historical records. Two other complementary experiments were performed: one to evaluate the measurement techniques (traditional and im
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/08/2011
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19. Simultaneous determination of pesticides used electroanalytical methods and chemometri methods / Determinação simultanêa de pesticidas utilizando métodos eletroanalíticos e quimiométricos
This paper describes the simultaneous determination of the pesticides paraquat and diquat using electroanalytical techniques coupled with chemometric methods. Although these two pesticides can be easily determined in trace levels, the same does not apply to mix due to a large overlap of the voltammetric peaks. For this reason it became necessary to treat the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/03/2011
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20. Variabilidade espacial de atritos físicos e químicos em solos de vale aluvial no semiárido de Pernambuco.
The study of soil hydraulic conductivity assumes high importance, being a parameter that measures the easiness which the soil‟s pores transmit water, being a relevant factor for the soil-water-plant system. Associated with this, another important parameter is the physical soil resistance to root penetration, which it has been the subject of extensive s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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21. Modelo logístico generalizado dependente do tempo com fragilidade
Several authors have preferred to model survival data in the presence of covariates through the hazard function, a fact related to its interpretation. The hazard function describes as the instantaneous average of failure changes over time. In this context, one of the most used models is the Coxs model (1972), in which the basic supposition for its use is tha
Publicado em: 2011
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22. Fatores determinantes do ataque de Neoleucinodes elegantalis ao tomateiro / Factors determinating the attack of Neoleucinodes elegantalis on tomato
The small tomato borer Neoleucinodes elegantalis (Lepidoptera: Crambidae) is considered a major pest due to serious damage in tomato. For the planning of strategies and tactics of management of N. elegantalis is essential to determine the factors that affect population dynamics and knowledge of stages and key factors of mortality. Therefore, objective of thi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2010
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23. Estudo experimental das solubilidades de alguns ácidos em misturas hidro-alcoólicas
Solubility data of chemistry compounds in water and in solvent mixtures are fundamental in the project of separation industrial equipments, such as: crystallizers, extractors, evaporators, leachates and absorption units. The accuracy that it is obtained in projects of chemistry industry equipment is closely related with the quality of experimental data used
Publicado em: 2010
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24. Medida teórico-experimental da condutividade de meios porosos usando o método de Boltzmann
The hydraulic conductivity is a soil parameter very important to environmental purposes including solute transport and water balance studies. For simulation and planning such parameter has been related to soil physical attributes as easily available as density and texture. With the aim of evaluating experimental and computational conductivities (K) of porous
Publicado em: 2010