945 resultados para Newton, Robert, 1780-1854.


Relevância:

20.00% 20.00%

Publicador:

Resumo:

This paper presents a new algorithm for optimal power flow problem. The algorithm is based on Newton's method which it works with an Augmented Lagrangian function associated with the original problem. The function aggregates all the equality and inequality constraints and is solved using the modified-Newton method. The test results have shown the effectiveness of the approach using the IEEE 30 and 638 bus systems.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The power flow problem, in transmission networks, has been well solved, for most cases, using Newton-Raphson method (NR) and its decoupled versions. Generally speaking, the solution of a non-linear system of equations refers to two methods: NR and Successive Substitution. The proposal of this paper is to evaluate the potential of the Substitution-Newton-Raphson Method (SNR), which combines both methods, on the solution of the power flow problem. Simulations were performed using a two-bus test network in order to observe the characteristics of these methods. It was verified that the NR is faster than SNR, in terms of convergence, considering non-stressed scenarios. For those cases where the power flow in the network is closed to the limits (stressed system), the SNR converges faster. This paper presents the power flow formulation of the SNR and describes its potential for its application in special cases such as stressed scenarios. © 2006 IEEE.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

El proyecto de investigacion, base para un estudio a nivel nacional, pretende conocer algunas variables tales como la edad, sexo, profesion, alfabetismo, caracteristicas de la familia, legitimidad y edad de la migracion para varios grupos de migrantes en momentos y lugares diferentes. La principal fuente de informacion son los 7 censos publicados entre 1854 y 1920. Su analisis solo entrega respuestas generales que deben ser completadas con estimaciones de migracion neta calculadas mediante tasas de supervivencia. Utilizando un escaso numero de manuscritos de censos disponibles, se ha podido configurar las caracteristicas basicas del migrante en algunas provincias, pero no su evolucion. Otra fuente de informacion cuantitativa importante son los registros matrimoniales de las parroquias, aunque presentan datos muy parciales. Cada una de las fuentes anteriores entrega informacion sobre distintos grupos de migrantes. Un analisis de sus diferentes resultados para una misma region permitira calificar los meritos de cada una.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

We describe an experimental procedure to probe the validity of Newton's second law. The experimental arrangement allows us to accelerate a glider on an air track by means of forces that are both steady and known. We also show how to determine acceleration from average speeds calculated for successive time intervals of the motion measured by using several electronic counters connected to a single-crystal oscillator circuit. Within experimental errors, the experiments clearly show the proportionality between acceleration and force for a fixed mass and between acceleration and inverse of mass for a fixed force. © by the Sociedade Brasileira de Física.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Pós-graduação em Biologia Animal - IBILCE

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Pós-graduação em Letras - IBILCE

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)