The use of numerical values for the chemical components of waters from an aquifer as input data for factor analysis is shown to be sometimes more convenient than the use of the logarithms of these figures. Factor analysis was applied…

This paper estimates the effects of school quality -- measured by the
pupil-teacher ratio, the average term length, and the relative pay of
teachers -- on the rate of return to education for men born between 1920 and
1949. Using…

This paper tests the hypothesis that compulsory school attendance
laws, which typically require school attendance until a specified birthday,
induce a relationship between years of schooling and age at school entry.
Variation in school start age created by children's date…

Resumo: O objetivo deste trabalho é de avaliar através de exames histopatológicos seqüenciais as les*es renais decorrentes de hemoglobinemia. Foram utilizados sete caprinos adultos, sendo 4 machos e 3 fêmeas Sem Raças Definida (SRD). Rerirou-se dos animais o volume sangüineo…

Resumo: 0 presente estudo foi realizado em 32 caprinos, adultos, Sem Raça Definida (SRD), sendo 16 machos e 16 fêmeas, com propósito de constatar a existência de alteraçoes funcionais renais em caprinos submetidos à aplicaçào intravenosa de hemolisado, através de…

Descripción completa.

Descripción completa.

Descripción completa.

Luminosity profiles and the evolution of shock waves in general-relativistic radiating spheres


(Herrera, L.; Núñez, Luis)


Abstract


A method recently proposed by the authors to study the evolution of discontinuities in radiating spherically symmetric…