Algebraic Expression
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Marco figural como medio para factorizar polinomios cuadráticos
This article is a proposal for the teaching and learning of factoring quadratic polynomials, based Regine Douady´s theoretical frameworks regarding the Tool-Object Dialectic. It highlights the role of combined mathematical frameworks as a means to access... "different formulations of a problem which, without necessarily being equivalent, allow a new approac
Bolema. Publicado em: 2012-12
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2. Geração de expressões algébricas para processos de negócio usando reduções de digrafos série-paralelo / Generation of algebraic expressions for business processes using reductions on series-parallel digraphs
Modeling and execution control are complementary approaches of business process management that have been developed independently. On one hand, modeling is usually performed by business specialists and explores semantical aspects of the business process. On other hand, execution control studies consistent and efficient mechanisms for implementation. This wor
Publicado em: 2008
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3. MÉTODOS APROXIMADOS DE SOLUÇÃO DE SISTEMAS DINÂMICOS NÃO-LINEARES / APPROXIMATE SOLUTION METHODS FOR NONLINEAR DYNAMICAL SYSTEMS
Nonlinear dynamical systems are rather common in engineering. This class of problems is usually solved by numerical integration or through the use of ap- proximate analytical methods (perturbation methods) or semi-analytical meth- ods such as the harmonic balance method. The numerical integration is a slow and cumbersome process in parametric analyses. The o
Publicado em: 2008
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4. Introdução da noção de variável em expressões algébricas por meio da resolução de problemas: Uma abordagem dinâmica
Students difficulties in writing and interpreting algebraic language, particularly in comprehending the meaning of variable have been discussed by such researchers as Kieran, Küchemann, Arcavi and others. In this research, we evaluate a teaching proposal in which it is aimed at explaining established relations between elements of circumstances of proportion
Publicado em: 2006
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5. From sequences of geometrical patterns to the introduction to algebraic thought / Das seqüências de padrões geométricos à introdução ao pensamento algébrico
The aim of this research is to study the introduction to the geometrical thought by means of sequences of geometrical patterns. Furthermore, we present an approach to pre-algebra in the elementary education and a discussion on the learning of such subject by means of a didactical series consisting of eight activities elaborated from the use of a series of ge
Publicado em: 2003
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6. An experimental/numerical study of the turbulent boundary layer development along a surface with a sudden change in roughness
A theory for the description of turbulent boundary layer flows over surfaces with a sudden change in roughness is considered. The theory resorts to the concept of displacement in origin to specify a wall function boundary condition for a kappa-epsilon model. An approximate algebraic expression for the displacement in origin is obtained from the experimental
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000
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7. Calculo de força e indutancia em circuitos eletricos
In this work we present a method for inductance calculation. We apply this method to various configurations of circuits, including the ones with surface or volumetric current density, using the formulas of Neumann, Weber, Maxwell and Graneau. We compare the results obtained with our method to the ones obtained with the usual approximation methods. We conclud
Publicado em: 1995
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8. Sequencing two DNA templates in five channels by digital compression.
By applying algebraic coding methods to the Sanger dideoxynucleotide procedure, DNA sequences of two templates can be determined simultaneously in only five reactions and data channels. A 5:2 data compression is accomplished by instantaneous source coding of nucleotide sequence pairs into one set of 5-bit block codes. A general algebraic expression, 2n-1 > o
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9. Statistical design considerations for pilot studies transitioning therapies from the bench to the bedside
Pilot studies are often used to transition therapies developed using animal models to a clinical setting. Frequently, the focus of such trials is on estimating the safety in terms of the occurrence of certain adverse events. With relatively small sample sizes, the probability of observing even relatively common events is low; however, inference on the true u
BioMed Central.
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10. The curvature of a Hilbert module over ℂ[z1, … , zd]
A notion of curvature is introduced in multivariable operator theory. The curvature invariant of a Hilbert module over ℂ[z1, … , zd] is a nonnegative real number which has significant extremal properties, which tends to be an integer, and which is hard to compute directly. It is shown that for graded Hilbert modules, the curvature agrees with the E
The National Academy of Sciences.
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11. Relative Efficacy of Different Alfalfa Cultivar-Rhizobium meliloti Strain Combinations for Symbiotic Nitrogen Fixation †
Five Rhizobium meliloti isolates known to have different capabilities for expression of nitrogenase activity under symbiotic conditions were used to inoculate four representative Medicago sativa cultivars under aseptic conditions. Nitrogenase activities and respiratory activity were measured for whole plants and excised nodules. Dry weights and nodule number
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12. Immunoregulatory responses in experimental disseminated histoplasmosis: depression of T-cell-dependent and T-effectory responses by activation of splenic suppressor cells.
The cellular immune responses of mice with disseminated histoplasmosis are markedly diminished in association with the generation of potent immunosuppressor activity by spleen cells. The zenith of suppressor activity was observed during most active infection, from 1 to 3 weeks after inoculation. During this time there was: (i) depression of the delayed-type