Nota del Director Principal a cargo de la Secretaría Ejecutiva sobre integración económica y cooperación tecnológica

Incluye Bibliografía

Informe del Director Principal a cargo de la Secretaría Ejecutiva sobre la marcha de los trabajos

Incluye Bibliografía

Exposición del Dr. Prebisch, Director Principal a cargo de la Secretaría Ejecutiva de la Comisión, en la primera sesión de trabajo el 14 de febrero 1962; versión provisional

Documento Informativo, No 7. Publicado separadamente en cada idioma

Exposición del Dr. Raúl Prebisch, Director Principal a cargo de la Secretaría Ejecutiva

También en: Prebisch, Raúl: Discursos, declaraciones y documentos 1952-1963, Tomo II

Genetic parameter estimates and principal component analysis of breeding values of reproduction and growth traits in female Canchim cattle

Phenotypic data from female Canchim beef cattle were used to obtain estimates of genetic parameters for reproduction and growth traits using a linear animal mixed model. In addition, relationships among animal estimated breeding values (EBVs) for these traits were explored using principal component analysis. The traits studied in female Canchim cattle were age at first calving (AFC), age at second calving (ASC), calving interval (CI), and bodyweight at 420 days of age (BW420). The heritability estimates for AFC, ASC, CI and BW420 were 0.03±0.01, 0.07±0.01, 0.06±0.02, and 0.24±0.02, respectively. The genetic correlations for AFC with ASC, AFC with CI, AFC with BW420, ASC with CI, ASC with BW420, and CI with BW420 were 0.87±0.07, 0.23±0.02, -0.15±0.01, 0.67±0.13, -0.07±0.13, and 0.02±0.14, respectively. Standardised EBVs for AFC, ASC and CI exhibited a high association with the first principal component, whereas the standardised EBV for BW420 was closely associated with the second principal component. The heritability estimates for AFC, ASC and CI suggest that these traits would respond slowly to selection. However, selection response could be enhanced by constructing selection indices based on the principal components. © CSIRO 2013.

Genetic parameters and principal component analysis for egg production from White Leghorn hens

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Damage Detection Based on Electromechanical Impedance Principle and Principal Components

This paper presents a novel time domain approach for Structural Health Monitoring (SHM) systems based on Electromechanical Impedance (EMI) principle and Principal Component Coefficients (PCC), also known as loadings. Differently of typical applications of EMI applied to SHM, which are based on computing the Frequency Response Function (FRF), in this work the procedure is based on the EMI principle but all analysis is conducted directly in time-domain. For this, the PCC are computed from the time response of PZT (Lead Zirconate Titanate) transducers bonded to the monitored structure, which act as actuator and sensor at the same time. The procedure is carried out exciting the PZT transducers using a wide band chirp signal and getting their time responses. The PCC are obtained in both healthy and damaged conditions and used to compute statistics indexes. Tests were carried out on an aircraft aluminum plate and the results have demonstrated the effectiveness of the proposed method making it an excellent approach for SHM applications. Finally, the results using EMI signals in both frequency and time responses are obtained and compared. © The Society for Experimental Mechanics 2014.

Latin American supply and major world market demand for the principal metals, 1970-1990: aluminium, copper, iron, nickel, lead, zinc, tin

Includes bibliography

Exposición del Dr. Raúl Prebisch, Director Principal a cargo de la Secretaría Ejecutiva, en la sesión inaugural del 19 de noviembre de 1956

Publicado también en portugués: Problemas do comércio interlatino-americano, en: Revista do Conselho Nacional de Economia, Rio de Janeiro, v. 6, No 43, p. 44-51, janeiro-fevereiro 1957; y en: Revista del Banco Central de Costa Rica, San José, No 28, p. 58-67, diciembre 1956