Series históricas de crecimiento de los países del Pacto Andino

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Damage detection in nonlinear structures using discrete-time volterra series

Structural damage identification is basically a nonlinear phenomenon; however, nonlinear procedures are not used currently in practical applications due to the complexity and difficulty for implementation of such techniques. Therefore, the development of techniques that consider the nonlinear behavior of structures for damage detection is a research of major importance since nonlinear dynamical effects can be erroneously treated as damage in the structure by classical metrics. This paper proposes the discrete-time Volterra series for modeling the nonlinear convolution between the input and output signals in a benchmark nonlinear system. The prediction error of the model in an unknown structural condition is compared with the values of the reference structure in healthy condition for evaluating the method of damage detection. Since the Volterra series separate the response of the system in linear and nonlinear contributions, these indexes are used to show the importance of considering the nonlinear behavior of the structure. The paper concludes pointing out the main advantages and drawbacks of this damage detection methodology. © (2013) Trans Tech Publications.

Intraoral schwannomas: Presentation of a series of 12 cases

Introduction: Schwannomas are benign and not very frequent tumors of the peripheral nerves, derived from the nerve supporting Schwann cells. Study Design: Data were collected on the clinical manifestations (sex, age), location, size and symptonts of the lesions as well as the evolution time and the initial (presumption) diagnosis. Results: Twelve patients were documented, with a mean age of 29,5 ± 12,1 years (range 16-50) and a balanced gender distribution. The mean duration of the lesions was 42,17± 45,3 months. The lesion located in the floor of the mouth was the largest tumor, measuring about 4 cm in maximum diameter, while the average size of the 12 schwannomas was 2.04± 1.1 cm. Conclusion: We present 12 oral schwannomas diagnosed and treated over a period of 10 years. © Medicina Oral S. L. C.I.F. B 96689336 - eISSN: 1989-5488.

Cambio del año base de las series de cuentas nacionales de la CEPAL

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Sistema de estadísticas de población, los recursos humanos y otras materias sociales: series, clasificaciones e indicadores sociales

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Proyecto regional de interconexión eléctrica del Istmo Centroamericano: análisis, extensión y generación sintética de las series hidrológicas para los proyectos considerados en el estudio

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Istmo Centroamericano: series históricas macroeconómicas

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Series macroeconómicas del Istmo Centroamericano, 1950-1996

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Una revisión crítica de los métodos de series de tiempo y de datos de panel aplicados al caso de la hipótesis de export-led growth

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Recopilación de series históricas del producto y del ingreso

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Sistema de almacenamiento y procesamiento de series estadísticas para el estudio del corto plazo

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Short-term energy forecasting using time series techniques: Chile, a case study

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América Latina y el Caribe: series estadísticas e indicadores de la deuda externa 1970-1990

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América Latina y el Caribe: series estadísticas e indicadores de la deuda externa 1970-1993

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